Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell includes an electrode assembly, a case, an electrode terminal, an insulating member, and a protective member. The case includes a wall portion provided with an electrode lead-out hole. The electrode assembly is accommodated in the case, and includes a tab. The electrode terminal is electrically connected to the tab, and includes a terminal main body that passes through the electrode lead-out hole, and a fixing portion connected to the terminal main body. The insulating member is provided around the terminal main body, and at least a portion of the insulating member is positioned between the fixing portion and the wall portion to insulate and separate the fixing portion and the wall portion. The protective member is provided around the terminal main body and in contact with the insulating member, and the tensile strength of the protective member is greater than the tensile strength of the insulating member.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the reliability of individual battery cells is a key research direction. Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes an electrode assembly, a housing, electrode terminals, an insulating member, and a protective member. The housing includes a wall portion with electrode lead-out holes. The electrode assembly is housed within the housing and includes tabs. The electrode terminals are electrically connected to the tabs and include a terminal body passing through the electrode lead-out holes and a fixing portion connected to the terminal body. The insulating member surrounds the terminal body, with at least a portion of the insulating member located between the fixing portion and the wall portion to insulatingly isolate the fixing portion and the wall portion. The protective member surrounds the terminal body and contacts the insulating member, and the tensile strength of the protective member is greater than the tensile strength of the insulating member.

[0006] The protective component surrounds the outer periphery of the terminal body. During the production or use of the battery cell, the protective component limits the degree of deformation and movement of the terminal body in its radial direction, thereby reducing the deformation of the insulation component under the force of the terminal body, lowering the risk of insulation component cracking, and improving the reliability of the battery cell. Compared with the insulation component, the protective component has higher tensile strength and is less prone to deformation and cracking under the force of the terminal body, thus reducing the risk of protective component failure and improving the reliability of the battery cell.

[0007] In some embodiments, the tensile strength of the protective component is greater than the tensile strength of the electrode terminal. The protective component can restrain the terminal body and reduce deformation of the terminal body.

[0008] In some embodiments, the protective component is made of metal or ceramic. Metals and ceramics have high tensile strength, which can improve the reliability of the protective component and reduce the risk of cracking.

[0009] In some embodiments, the protective member has a first through hole, the insulating member has a second through hole, and the terminal body passes through the first through hole, the second through hole, and the electrode lead-out hole. By providing the first and second through holes, it is convenient for the terminal body to pass through the protective member and the insulating member.

[0010] In some embodiments, a portion of the protective member protrudes inward from the wall of the second through hole along the radial direction of the electrode lead-out hole. This inward protrusion of the protective member from the wall of the second through hole can restrict deformation or movement of the terminal body, reduce the risk of the terminal body directly pressing against the wall of the second through hole, reduce the stretching of the insulating member in the radial direction of the electrode lead-out hole, reduce the risk of the insulating member cracking, and improve the reliability of the battery cell.

[0011] In some embodiments, a portion of the protective member protrudes inward from the wall of the electrode lead-out hole along its radial direction. This inward protrusion of the protective member from the hole wall can restrict deformation or movement of the terminal body, thereby reducing the risk of the terminal body pressing against the wall, mitigating short-circuit risk to some extent, and improving the reliability of the battery cell.

[0012] In some embodiments, the first through hole, the second through hole, and the electrode lead-out hole are coaxially arranged.

[0013] By coaxially arranging the first through hole, the second through hole, and the electrode lead-out hole, the terminal body can pass through the first through hole, the second through hole, and the electrode lead-out hole simultaneously, simplifying the structural requirements of the terminal body and reducing assembly difficulty.

[0014] In some embodiments, at least a portion of the wall of the first through hole abuts against the outer periphery of the terminal body.

[0015] When a battery cell is subjected to external impact, the radial sway of the terminal body along the electrode lead-out hole is reduced. The wall of the first through hole directly abuts against the outer periphery of the terminal body, which can effectively limit the deformation of the terminal body.

[0016] In some embodiments, the portion of the protective member protruding from the wall of the second through hole is annular. The protective member can constrain the terminal body from the outer periphery as a whole, thereby further reducing the risk of the terminal body directly pressing against the wall of the second through hole, reducing the radial stretching of the insulating member in the electrode lead hole, reducing the risk of the insulating member cracking, and improving the reliability of the battery cell.

[0017] In some embodiments, in the thickness direction of the wall portion, the fixing portion at least partially overlaps with the wall portion, and at least a portion of the insulating member and at least a portion of the protective member are located between the wall portion and the fixing portion.

[0018] The fixing part and the wall part can clamp the insulating part and the protective part in the thickness direction, thereby improving the stability of the insulating part and the protective part. When the battery cell is subjected to external impact, the movement of the insulating part relative to the wall part and the movement of the protective part relative to the wall part are reduced, thus improving reliability.

[0019] In some embodiments, the width of the projection of the fixing part onto the insulating member along the thickness direction is greater than or equal to 0.5 mm, so that the fixing part can effectively press the insulating member onto the wall, reducing the risk of the insulating member shifting along the electrode lead-out hole and improving reliability.

[0020] In some embodiments, the protective member includes a first portion and a second portion connected to the first portion. The first portion overlaps with the insulating member along the thickness direction and is radially connected to the electrode lead-out hole. The second portion protrudes inwardly from the hole wall of the second through hole.

[0021] The first part overlaps with the insulating component along the thickness direction, so that the wall portion and the fixing portion can simultaneously clamp the insulating component and the first part in the thickness direction. The second part can limit the deformation or movement of the terminal body, reduce the risk of the terminal body directly pressing the wall of the second through hole, reduce the radial stretching of the insulating component in the electrode lead hole, reduce the risk of the insulating component cracking, and improve the reliability of the battery cell.

[0022] In some embodiments, in the thickness direction, the projection of the second through hole is located within the projection of the electrode lead-out hole, thereby causing the second portion to protrude inward from the hole wall of the electrode lead-out hole, reducing the risk of the terminal body squeezing the wall portion, reducing the deformation of the wall portion, and improving the reliability of the battery cell.

[0023] In some embodiments, the first portion is embedded inside the insulating member. Embedding the first portion into the insulating member allows the relative position of the insulating member and the protective member to be fixed during the assembly of the battery cell, enabling the protective member to better restrict the deformation of the electrode terminals during assembly, thereby better protecting the insulating member and reducing the risk of the insulating member cracking.

[0024] In some embodiments, at least a portion of the first part is located between the fixing part and the insulating member along the thickness direction. The fixing part can compress the insulating member through the protective member, which provides a protective effect, thereby reducing the risk of the fixing part damaging the insulating member and improving reliability.

[0025] In some embodiments, the insulating member includes an insulating body and an insulating protrusion, a second through-hole penetrating the insulating body in the thickness direction, at least a portion of the insulating body being located between the fixing portion and the wall portion, and the insulating protrusion protruding from the surface of the insulating body opposite to the wall portion. At least a portion of the protective member is located between the fixing portion and the insulating body in the thickness direction, and is located radially between the insulating protrusion and the terminal body in the second through-hole.

[0026] During the assembly of protective components, the insulating protrusions can position the components, thus simplifying the installation process. During the production or use of individual battery cells, the insulating protrusions can limit the movement of the protective components, thereby reducing offset and improving their reliability.

[0027] In some embodiments, the diameter of the second through hole is D1, the diameter of the first through hole is D2, and the outer diameter of the protective member is D3; the insulating protrusion is annular, and the inner diameter of the insulating protrusion is D4. D1, D2, D3, and D4 satisfy: D1-D2 > D4-D3.

[0028] D4-D3 is related to the radial offset of the protective component, and the dimension of the protective component protruding radially inward from the wall of the second through hole is related to the value of D1-D2. In this embodiment, D4-D3 is limited to be less than D1-D2. Even if the protective component deviates during assembly, it can still ensure to a certain extent that the protective component protrudes radially inward from the wall of the second through hole. This allows the protective component to limit the degree of deformation and movement of the terminal body in its own radial direction, reduce the risk of insulation cracking, and improve the reliability of the battery cell.

[0029] In some embodiments, the electrode terminal further includes a limiting portion disposed around the terminal body, with the limiting portion and the fixing portion located on opposite sides of the wall portion in the thickness direction of the wall portion. The limiting portion and the fixing portion can clamp the wall portion from both sides, thereby fixing the electrode terminal to the wall portion.

[0030] In some embodiments, the fixing part is located inside the wall portion; or, the fixing part is located outside the wall portion.

[0031] In some embodiments, the fixing portion is configured to be folded into shape after the electrode terminal passes through the electrode lead-out hole.

[0032] When the electrode terminal is folded, the material flows towards the fold, causing the outer periphery of the electrode terminal to expand. The protective component can restrict the flow of material during the molding process of the fixing part, reduce the radial expansion of the electrode terminal, reduce the risk of the insulating component cracking under pressure during the molding process of the fixing part, and improve the reliability of the battery cell.

[0033] In some embodiments, the protective component and the insulating component are fixedly connected. When assembling battery cells, the protective component and the insulating component can be supplied together, thereby eliminating the need for positioning and installation of the protective component, simplifying the assembly process, and reducing costs.

[0034] In some embodiments, the protective component and the insulating component are integrally injection molded. Integral injection molding can improve the bonding strength between the insulating component and the protective component.

[0035] In some embodiments, the housing includes a shell and an end cap, the shell having an opening and the end cap closing the opening. The shell includes a bottom wall disposed opposite the end cap, the wall portion being the bottom wall.

[0036] Secondly, embodiments of this application provide a battery comprising a plurality of battery cells provided in any of the embodiments of the first aspect.

[0037] Thirdly, embodiments of this application provide an electrical device including a battery according to the second aspect, the battery being used to provide electrical energy. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0039] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0040] Figure 2 Explosion diagrams of batteries provided for some embodiments of this application;

[0041] Figure 3 for Figure 2 The diagram shows the structure of the battery module.

[0042] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0043] Figure 5 for Figure 4 The diagram shows an exploded battery cell;

[0044] Figure 6 A cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0045] Figure 7 for Figure 6 Enlarged view of the area within the circle;

[0046] Figure 8 for Figure 7 Enlarged illustration within the box;

[0047] Figure 9 Schematic diagram of insulating and protective components of a battery cell provided in some embodiments of this application;

[0048] Figure 10 for Figure 9 Enlarged view of the area within the circle;

[0049] Figure 11 This is a schematic diagram of the structure of a battery cell before the fixing part is formed, provided in some embodiments of this application;

[0050] Figure 12 Partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application;

[0051] Figure 13 for Figure 12 Enlarged view of the area within the circle;

[0052] Figure 14 Schematic diagram of insulating and protective components of a battery cell provided in some embodiments of this application;

[0053] Figure 15 Partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application;

[0054] Figure 16 This is a partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application.

[0055] The attached figures are labeled as follows: 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Storage space; 6. Battery module; 7. Battery cell; 10. Electrode assembly; 11. Tab; 20. Outer shell; 21. Housing; 211. Bottom wall; 22. End cap; 23. Wall portion; 231. Electrode lead-out hole; 30. Electrode terminal; 31. Terminal body; 311. Second recess; 312. Third through hole; 32. Fixing part; 33. Limiting part; 34. Third recess; 35. Fifth recess; 40. Insulating component; 41. Second through hole; 42. Insulating body; 43. Insulating protrusion; 44. First recess; 45. Fourth recess; 50. Protective component; 51. First through hole; 52. First part; 53. Second part; 60. Seal; 70. Sealing plate; 80. Current collector; Z. Thickness direction. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0058] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

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

[0062] In this application, "multiple" means two or more (including two).

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] Battery cells may include, but are not limited to, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0065] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0066] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0067] 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.

[0068] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0069] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0070] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0071] A single battery cell typically consists of an electrode assembly and a casing, with the electrode assembly housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0072] The housing is used to encapsulate electrode components and electrolytes. The housing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0073] Each battery cell typically also has electrode terminals mounted on the casing. These terminals are used for electrical connection to the electrode assembly to discharge the electrical energy generated by the assembly. To reduce the risk of short circuits, the electrode terminals and the casing need to be insulated. The casing usually has an insulating element, at least a portion of which is located between the electrode terminals and the casing, to insulate the electrode terminals from the casing.

[0074] During the production or use of a battery cell, the insulating components may be squeezed and stretched by the electrode terminals, causing the insulating components to crack and leading to the risk of insulation failure, thus affecting the reliability of the battery cell.

[0075] In view of this, the present application provides a technical solution that restricts the deformation or movement of the electrode terminal by providing a protective component with high tensile strength on the outer periphery of the electrode terminal, reduces the deformation of the insulating component under the action of the electrode terminal, reduces the risk of the insulating component cracking, and improves the reliability of the battery cell.

[0076] The battery cells described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0077] The battery cell, battery, and electrical device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0078] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0079] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0080] like Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0081] Vehicle 1 may also include controller 3 and motor 4. Controller 3 is used to control battery 2 to supply power to motor 4, for example, for the power needs of vehicle 1 during start-up, navigation and driving.

[0082] In some embodiments of this application, the battery 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0083] Figure 2 This is a schematic diagram of a battery explosion provided for some embodiments of this application. For example... Figure 2 As shown, battery 2 includes a housing 5 and battery cells ( Figure 2 (Not shown), the battery cells are housed inside the casing 5.

[0084] The housing 5 is used to house individual battery cells, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the individual battery cells. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as cylinders, cuboids, etc.

[0085] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0086] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0087] In battery 2, there can be one or more individual battery cells. If there are multiple individual battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple individual battery cells are connected in both series and parallel configurations. Multiple individual battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within housing 5. Alternatively, multiple individual battery cells can first be connected in series, parallel, or in a mixed configuration to form battery module 6, and then multiple battery modules 6 can be connected in series, parallel, or in a mixed configuration to form a whole and housed within housing 5.

[0088] A single battery cell can be the smallest unit that makes up a battery.

[0089] Figure 3 for Figure 2 The diagram shows the structure of the battery module.

[0090] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or a combination of both to form a battery module 6. These battery modules 6 are then connected in series, parallel, or a combination of both to form a whole, which is housed within the casing.

[0091] Multiple battery cells 7 in battery module 6 can be electrically connected through busbars to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6. There can be one or more busbars, each used to electrically connect at least two battery cells.

[0092] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 5 for Figure 4 The diagram shows an exploded view of a single battery cell.

[0093] like Figure 4 and Figure 5 As shown, in some embodiments, the battery cell 7 includes an electrode assembly 10 and a housing 20, with the electrode assembly 10 housed within the housing 20.

[0094] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. Optionally, the electrode assembly 10 also includes a separator disposed between the positive and negative electrodes, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0095] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a layer of positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0096] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0097] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-surfaced aluminum, or stainless steel can be used. The composite current collector may 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0098] As an example, the positive electrode active material layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers in batteries may also be used. These positive electrode active material layers may use only one type or a combination of two or more types. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0099] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not have a positive electrode active material layer. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0102] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0103] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0104] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 7. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0105] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0106] In some embodiments, the separator includes a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0107] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0108] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0109] In some embodiments, the battery cell 7 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0110] Liquid electrolytes include electrolyte salts and solvents.

[0111] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0112] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0113] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0114] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0115] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0116] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfo-silver-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0117] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0118] In some embodiments, the electrode assembly 10 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0119] In some embodiments, the electrode assembly 10 has a stacked structure.

[0120] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0121] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0122] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0123] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0124] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0125] In some embodiments, the electrode assembly 10 may be cylindrical, flat, or polygonal, etc.

[0126] In some embodiments, the electrode assembly 10 is provided with tabs 11, which can conduct current from the electrode assembly 10. The tabs 11 include a positive tab and a negative tab.

[0127] In some embodiments, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening and the end cap 22 for closing the opening.

[0128] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 7. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0129] The housing 21 and the end cap 22 can be separate components. For example, an opening can be provided on the housing 21, and the end cap 22 can be used to close the opening to form an internal cavity for the battery cell 7.

[0130] The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 10. The housing 21 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0131] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 22 is not easily deformed when subjected to compression and impact, so that the battery cell 7 can have higher structural strength and improve reliability.

[0132] The end cap 22 is connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0133] The housing 21 may be open at one end or open at both ends. In some examples, the housing 21 may be a structure with an opening on one side, and one end cap 22 is provided to cover the housing 21. In other examples, the housing 21 may also be a structure with openings on both sides, and two end caps 22 are provided, with the two end caps 22 respectively covering the two openings of the housing 21.

[0134] In some embodiments, the battery cell 7 includes electrode terminals 30. The electrode terminals 30 are electrically connected to the tabs 11 for outputting or inputting electrical energy into the battery cell 7.

[0135] Figure 6 A cross-sectional schematic diagram of a battery cell provided in some embodiments of this application; Figure 7 for Figure 6 Enlarged view of the area within the circle; Figure 8 for Figure 7 Enlarged illustration within the box; Figure 9 Schematic diagram of insulating and protective components of a battery cell provided in some embodiments of this application; Figure 10 for Figure 9 Enlarged view of the area within the circle.

[0136] Reference Figures 5 to 10In some embodiments, the battery cell 7 includes an electrode assembly 10, a housing 20, electrode terminals 30, an insulator 40, and a protective member 50. The housing 20 includes a wall 23 with an electrode lead-out hole 231. The electrode assembly 10 is housed within the housing 20 and includes tabs 11. The electrode terminals 30 are electrically connected to the tabs 11. The electrode terminals 30 include a terminal body 31 passing through the electrode lead-out hole 231 and a fixing portion 32 connected to the terminal body 31. The insulator 40 surrounds the terminal body 31, with at least a portion of the insulator 40 located between the fixing portion 32 and the wall 23 to provide insulation between the fixing portion 32 and the wall 23. The protective member 50 surrounds the terminal body 31 and contacts the insulator 40, and the tensile strength of the protective member 50 is greater than the tensile strength of the insulator 40.

[0137] The housing 20 may contain one or more electrode assemblies 10.

[0138] As an example, electrode assembly 10 includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode coated region with a positive active material layer and a positive electrode uncoated region without a positive active material layer, and the negative electrode includes a negative electrode coated region with a negative active material layer and a negative electrode uncoated region without a negative active material layer. The positive electrode uncoated region of the positive electrode constitutes a positive electrode tab, and the negative electrode uncoated region of the negative electrode constitutes a negative electrode tab. During the charging and discharging process of the battery cell 7, the positive and negative active material layers react with the electrolyte.

[0139] The tab 11 electrically connected to the electrode terminal 30 can be either a positive tab or a negative tab.

[0140] The tab 11 can be directly connected to the electrode terminal 30, for example, by welding, abutting or other means. Alternatively, the tab 11 can also be indirectly connected to the electrode terminal 30 through other conductive components (e.g., current collector 80) to achieve electrical connection between the tab 11 and the electrode terminal 30.

[0141] As an example, wall 23 can be end cap 22 or a wall of housing 21.

[0142] The shape of the wall portion 23 can be circular, rectangular, elliptical or other shapes.

[0143] The electrode lead-out hole 231 extends through the wall portion 23 to allow the electrode terminal 30 to lead the electrical energy of the electrode assembly 10 to the outside of the housing 20. Optionally, the electrode lead-out hole 231 extends through the wall portion 23 along the thickness direction Z of the wall portion 23.

[0144] For example, the terminal body 31 can pass through the electrode lead-out hole 231 to facilitate the connection of the electrode terminal 30 to the busbar located outside the battery cell 7.

[0145] For example, the projection of the terminal body 31 along the thickness direction Z is located within the projection of the electrode lead-out hole 231 along the thickness direction Z.

[0146] There may be one or more fixing parts 32.

[0147] In some examples, there may be one fixing part 32, which is disposed around the terminal body 31. In other examples, there may be multiple fixing parts 32, which are disposed at intervals along the circumference of the terminal body 31.

[0148] An insulating element 40 is disposed around the terminal body 31. As an example, the insulating element 40 may be sleeved on the terminal body 31, and the insulating element 40 may or may not be in contact with the terminal body 31.

[0149] The insulating member 40 may be integrally disposed between the fixing part 32 and the wall part 23, or it may be partially disposed between the fixing part 32 and the wall part 23. The insulating member 40 may be in direct contact with the fixing part 32, or it may be separated by other components, such as being separated by the protective member 50. The insulating member 40 may be in direct contact with the wall part 23, or it may be separated by other components, such as being separated by the protective member 50.

[0150] The insulating member 40 can at least insulate the fixing part 32 from the wall part 23. Alternatively, the insulating member 40 can also insulate at least a portion of the terminal body 31 from the wall part 23.

[0151] The protective component 50 is fitted onto the terminal body 31, and it may or may not be in contact with the terminal body 31.

[0152] The protective component 50 and the insulating component 40 are in contact with each other. They may simply be in contact, or they may be in contact with each other and directly fixedly connected.

[0153] Tensile strength reflects a material's resistance to fracture. It is the ability of a material or specimen to resist fracture under static tension, or the maximum tensile force (tensile stress) that a material can withstand without fracturing.

[0154] For example, the tensile strength of the protective component 50 can be tested by the following method: cut a section of specimen from the protective component 50 and measure the cross-sectional area S of the specimen; fix both ends of the specimen on a tensile testing machine; start the tensile testing machine and load it at a constant speed, and record the maximum load F that causes the specimen to fail in shear; calculate F / S, and the tensile strength of the protective component 50 can be measured. Detailed steps can be found in the national standard GB / T 228-2002 "Metallic materials - Tensile testing at room temperature".

[0155] Similarly, the tensile strength of the insulating component 40 can also be tested using the method described above.

[0156] The tensile strength of the protective component 50 can be greater than, equal to or less than the tensile strength of the electrode terminal 30.

[0157] In the thickness direction Z of the wall portion 23, the projection of the fixing portion 32 may or may not overlap with the projection of the wall portion 23. For example, the fixing portion 32 may be located inside or outside the wall portion 23.

[0158] In this embodiment, the protective member 50 surrounds the outer periphery of the terminal body 31. During the production or use of the battery cell 7, the protective member 50 can limit the degree of deformation and movement of the terminal body 31 in its radial direction, thereby reducing the deformation of the insulating member 40 under the force of the terminal body 31, reducing the risk of cracking of the insulating member 40, and improving the reliability of the battery cell 7. Compared with the insulating member 40, the protective member 50 has higher tensile strength and is less prone to deformation and cracking when subjected to the force of the terminal body 31, thereby reducing the risk of failure of the protective member 50 and improving the reliability of the battery cell 7.

[0159] In some embodiments, the tensile strength of the protective member 50 is greater than the tensile strength of the electrode terminal 30. The protective member 50 can restrain the terminal body 31 and reduce the deformation of the terminal body 31.

[0160] In some embodiments, the tensile strength of the protective element 50 is greater than or equal to 40 MPa. Optionally, the tensile strength of the protective element 50 is 40 MPa, 50 MPa, 80 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 600 MPa, 800 MPa, or 1000 MPa.

[0161] In some embodiments, the elastic modulus of the protective member 50 is 50 GPa-500 GPa to reduce the deformation of the protective member 50 when subjected to compression by the terminal body 31. Optionally,

[0162] In some embodiments, the protective element 50 is made of metal or ceramic. Metals and ceramics have high tensile strength, which can improve the reliability of the protective element 50 and reduce the risk of cracking.

[0163] In some embodiments, the protective element 50 is made of aluminum or stainless steel. For example, the protective element 50 is an aluminum ring or a stainless steel ring.

[0164] In some embodiments, the protective element 50 is made of insulating ceramic, which can improve the insulation between the electrode terminal 30 and the wall portion 23 and reduce the risk of short circuit.

[0165] In some embodiments, at least a portion of the insulating member 40 is located between the fixing portion 32 and the wall portion 23, so that the insulating member 40 is fixed to the wall portion 23. Exemplarily, the fixing portion 32 can press the insulating member 40 onto the wall portion 23 to achieve the fixation of the insulating member 40.

[0166] In some embodiments, the insulating member 40 separates the protective member 50 from the wall portion 23. When the protective member 50 is made of a conductive material, the insulating member 40 can insulate the wall portion 23 from the protective member 50, thereby reducing the risk of the electrode terminal 30 becoming conductive through the protective member 50 and the wall portion 23, and improving reliability.

[0167] In some embodiments, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening and the end cap 22 closing the opening. The housing 21 includes a bottom wall 211 disposed opposite to the end cap 22.

[0168] The wall portion 23 can be either a bottom wall 211 or an end cap 22.

[0169] In some embodiments, the wall portion 23 is a bottom wall 211. Exemplarily, one of the bottom wall 211 and the electrode terminal 30 can serve as the positive output electrode of the battery cell 7, and the other can serve as the negative output electrode of the battery cell 7; by placing the electrode terminal 30 on the bottom wall 211, it is convenient for the battery cell 7 to lead out positive and negative output electrodes on the same side.

[0170] In some embodiments, the protective member 50 is provided with a first through hole 51, the insulating member 40 is provided with a second through hole 41, and the terminal body 31 passes through the first through hole 51, the second through hole 41 and the electrode lead-out hole 231.

[0171] The first through hole 51, the second through hole 41, and the electrode lead-out hole 231 can be arranged coaxially or non-coaxially.

[0172] Along the radial direction of the electrode lead-out hole 231, the protective member 50 may protrude inward from the hole wall of the second through hole 41, or it may not protrude inward from the hole wall of the second through hole 41.

[0173] Along the radial direction of the electrode lead-out hole 231, the protective member 50 may protrude inward from the hole wall of the electrode lead-out hole 231, or it may not protrude inward from the hole wall of the electrode lead-out hole 231.

[0174] The protective component 50 may or may not come into contact with the terminal body 31.

[0175] By providing a first through hole 51 and a second through hole 41, it is convenient for the terminal body 31 to pass through the protective member 50 and the insulating member 40.

[0176] In some embodiments, a portion of the protective member 50 protrudes inward from the wall of the second through hole 41 along the radial direction of the electrode lead-out hole 231.

[0177] The portion of the protective component 50 that protrudes inward from the wall of the second through hole 41 can limit the deformation or movement of the terminal body 31, reduce the risk of the terminal body 31 directly pressing against the wall of the second through hole 41, reduce the radial stretching of the insulating component 40 in the electrode lead-out hole 231, reduce the risk of the insulating component 40 cracking, and improve the reliability of the battery cell 7.

[0178] In some embodiments, a portion of the protective member 50 protrudes inward from the wall of the electrode lead-out hole 231 along the radial direction of the electrode lead-out hole 231.

[0179] The protective component 50 protrudes inward from the wall of the electrode lead-out hole 231, which can limit the deformation or movement of the terminal body 31, thereby reducing the risk of the terminal body 31 pressing against the wall 23, reducing the risk of short circuit to a certain extent, and improving the reliability of the battery cell 7.

[0180] In some embodiments, the first through hole 51, the second through hole 41, and the electrode lead-out hole 231 are coaxially arranged.

[0181] For example, coaxial arrangement can mean that the axis of the first through hole 51, the axis of the second through hole 41, and the axis of the electrode lead-out hole 231 coincide. Optionally, the axis of the first through hole 51, the axis of the second through hole 41, and the axis of the electrode lead-out hole 231 are all parallel to the thickness direction Z.

[0182] Understandably, "coaxial" includes not only the case of absolute coaxiality, but also the case of approximate coaxiality as commonly understood in engineering.

[0183] By coaxially arranging the first through hole 51, the second through hole 41, and the electrode lead-out hole 231, the terminal body 31 can pass through the first through hole 51, the second through hole 41, and the electrode lead-out hole 231 simultaneously, simplifying the structural requirements of the terminal body 31 and reducing assembly difficulty.

[0184] In some embodiments, the diameter of the electrode lead-out hole 231 is greater than or equal to the diameter of the second through hole 41. Optionally, the diameter of the electrode lead-out hole 231 is greater than the diameter of the second through hole 41.

[0185] In some embodiments, the diameter of the second through hole 41 is greater than or equal to the diameter of the first through hole 51. Optionally, the diameter of the second through hole 41 is greater than the diameter of the first through hole 51.

[0186] In some embodiments, at least a portion of the wall of the first through hole 51 abuts against the outer periphery of the terminal body 31.

[0187] When the battery cell 7 is subjected to external impact, the radial sway of the terminal body 31 along the electrode lead-out hole 231 is reduced. The wall of the first through hole 51 directly abuts against the outer periphery of the terminal body 31, which can effectively limit the deformation of the terminal body 31.

[0188] In some embodiments, the portion of the protective member 50 protruding from the wall of the second through hole 41 is annular. The protective member 50 can restrict the terminal body 31 from the outer periphery, thereby further reducing the risk of the terminal body 31 directly pressing against the wall of the second through hole 41, reducing the radial stretching of the insulating member 40 in the electrode lead-out hole 231, reducing the risk of cracking of the insulating member 40, and improving the reliability of the battery cell 7.

[0189] In some embodiments, in the thickness direction Z of the wall portion 23, the fixing portion 32 at least partially overlaps with the wall portion 23, and at least a portion of the insulating member 40 and at least a portion of the protective member 50 are located between the wall portion 23 and the fixing portion 32.

[0190] The fixing part 32 and the wall part 23 can clamp the insulating part 40 and the protective part 50 in the thickness direction Z, thereby improving the stability of the insulating part 40 and the protective part 50. When the battery cell 7 is subjected to external impact, the movement of the insulating part 40 relative to the wall part 23 and the movement of the protective part 50 relative to the wall part 23 are reduced, thereby improving reliability.

[0191] In some embodiments, the fixing part 32 is annular.

[0192] In some embodiments, the width W of the projection of the fixing part 32 onto the insulating member 40 along the thickness direction Z is greater than or equal to 0.5 mm, so that the fixing part 32 can effectively press the insulating member 40 onto the wall part 23, reduce the risk of the insulating member 40 shifting along the electrode lead-out hole 231, and improve reliability.

[0193] In some embodiments, the width W of the projection of the fixing part 32 onto the insulating member 40 along the thickness direction Z is greater than or equal to 0.5mm-5mm.

[0194] For example, the projection of the fixing part 32 onto the insulating member 40 along the thickness direction Z can be annular, and W can be the width of the annular projection. The minimum width of the annular projection is greater than or equal to 0.5 mm.

[0195] In some embodiments, the protective member 50 includes a first portion 52 and a second portion 53 connected to the first portion 52. The first portion 52 overlaps with the insulating member 40 along the thickness direction Z and is radially connected to the electrode lead-out hole 231. The second portion 53 protrudes inwardly from the hole wall of the second through hole 41.

[0196] The first part 52 being overlapped with the insulating member 40 along the thickness direction Z can mean that the projection of the first part 52 along the thickness direction Z is located within the projection of the insulating member 40 along the thickness direction Z.

[0197] The first part 52 overlaps with the insulating member 40 along the thickness direction Z, so that the wall part 23 and the fixing part 32 can simultaneously clamp the insulating member 40 and the first part 52 in the thickness direction Z. The second part 53 can restrict the deformation or movement of the terminal body 31, reduce the risk of the terminal body 31 directly pressing the hole wall of the second through hole 41, reduce the radial stretching of the insulating member 40 in the electrode lead-out hole 231, reduce the risk of the insulating member 40 cracking, and improve the reliability of the battery cell 7.

[0198] In some embodiments, the second portion 53 may be annular. Exemplarily, the second portion 53 is a circular annular or a square annular.

[0199] In some embodiments, the second part 53 is an annular ring. Understandably, the inner and outer circles of the annular ring may or may not be concentric.

[0200] In some embodiments, the annular width of the second portion 53 is 0.1mm-0.8mm. In this embodiment, the annular width of the second portion 53 is limited to greater than or equal to 0.1mm, which increases the distance between the wall of the second through hole 41 and the terminal body 31, reducing the risk of the terminal body 31 compressing the insulating member 40. In this embodiment, the annular width of the second portion 53 is limited to less than or equal to 0.8mm to reduce the loss in diameter of the terminal body 31 and improve the current-carrying capacity of the terminal body 31.

[0201] In some embodiments, the projection of the second through hole 41 is located within the projection of the electrode lead-out hole 231 in the thickness direction Z, thereby causing the second portion 53 to protrude inward from the hole wall of the electrode lead-out hole 231, reducing the risk of the terminal body 31 pressing the wall portion 23, reducing the deformation of the wall portion 23, and improving the reliability of the battery cell 7.

[0202] In some embodiments, at least a portion of the first portion 52 is located between the fixing portion 32 and the insulating member 40 along the thickness direction Z.

[0203] The fixing part 32 can compress the insulating part 40 through the protective part 50. The protective part 50 can play a protective role, thereby reducing the risk of the fixing part 32 crushing the insulating part 40 and improving reliability.

[0204] In some embodiments, the protective member 50 has a first surface and a second surface disposed opposite to each other along the thickness direction Z, the first surface being in contact with the fixing part 32 and the second surface being in contact with the insulating member 40.

[0205] In some embodiments, the fixing part 32 does not directly contact the insulating part 40.

[0206] In some embodiments, the protective member 50 may be movably placed on the insulating member 40 or fixedly connected to the insulating member 40.

[0207] In some embodiments, the protective member 50 is movably placed on the insulating member 40, and the protective member 50 is pressed tightly against the insulating member 40 by the fixing part 32. The contact surfaces of the protective member 50 and the insulating member 40 are not directly connected. In this way, when the protective member 50 is subjected to a radial force along the electrode lead-out, the protective member 50 can move relative to the insulating member 40, thereby reducing the force exerted by the protective member 50 on the insulating member 40 and reducing the risk of cracking or failure of the insulating member 40.

[0208] In some embodiments, the protective member 50 is fixedly connected to the insulating member 40. Exemplarily, the protective member 50 and the insulating member 40 can be fixedly connected even without the function of the fixing part 32.

[0209] When assembling the battery cell 7, the protective component 50 and the insulating component 40 can be supplied together, thereby eliminating the need for positioning and installation of the protective component 50, simplifying the assembly process and reducing costs.

[0210] In some embodiments, the protective component 50 is fixedly connected to the insulating component 40 by bonding, hot pressing, integral injection molding or other means.

[0211] In some embodiments, the insulating member 40 includes an insulating body 42 and an insulating protrusion 43. A second through hole 41 extends through the insulating body 42 along the thickness direction Z. At least a portion of the insulating body 42 is located between the fixing portion 32 and the wall portion 23. The insulating protrusion 43 protrudes from the surface of the insulating body 42 opposite to the wall portion 23. At least a portion of the protective member 50 is located between the fixing portion 32 and the insulating body 42 in the thickness direction Z, and is located radially between the insulating protrusion 43 and the terminal body 31 in the second through hole 41.

[0212] There may be one or more insulating protrusions 43. In some examples, there is one insulating protrusion 43 that surrounds the outside of the protective member 50; in other examples, there are multiple insulating protrusions 43 that are spaced apart circumferentially along the protective member 50.

[0213] During the assembly of the protective component 50, the insulating protrusion 43 can position the protective component 50, thereby simplifying the installation process of the protective component 50. During the production or use of the battery cell 7, the insulating protrusion 43 can limit the movement of the protective component 50, thereby reducing the offset of the protective component 50 and improving the reliability of the protective component 50.

[0214] In some embodiments, the diameter of the second through hole 41 is D1, the diameter of the first through hole 51 is D2, and the outer diameter of the protective member 50 is D3; the insulating protrusion 43 is annular, and the inner diameter of the insulating protrusion 43 is D4. D1, D2, D3, and D4 satisfy: D1-D2 > D4-D3.

[0215] D4-D3 are related to the radial offset of the protective member 50, and the size of the protective member 50 protruding radially inward from the wall of the second through hole 41 is related to the value of D1-D2. In this embodiment, D4-D3 is limited to be less than D1-D2. Even if the protective member 50 deviates during assembly, it can still ensure to a certain extent that the protective member 50 protrudes radially inward from the wall of the second through hole 41. This allows the protective member 50 to limit the degree of deformation and movement of the terminal body 31 in its own radial direction, reduce the risk of cracking of the insulating member 40, and improve the reliability of the battery cell 7.

[0216] In some embodiments, the insulating protrusion 43 and the insulating body 42 define a first recess 44, in which the protective member 50 is received.

[0217] In some embodiments, at least a portion of the fixing portion 32 is accommodated in the first recess 44.

[0218] In some embodiments, the fixing portion 32 and the insulating protrusion 43 are spaced apart in the radial direction of the electrode lead-out hole 231 to reduce the risk of the fixing portion 32 directly pressing the insulating protrusion 43.

[0219] In some embodiments, a portion of the insulating body 42 extends into the electrode lead-out hole 231 to insulate at least a portion of the hole wall of the electrode lead-out hole 231 from the terminal body 31.

[0220] In some embodiments, the electrode terminal 30 further includes a limiting portion 33 disposed around the terminal body 31, wherein the limiting portion 33 and the fixing portion 32 are respectively located on both sides of the wall portion 23 in the thickness direction Z of the wall portion 23.

[0221] For example, in the thickness direction Z, at least a portion of the wall portion 23 is located between the limiting portion 33 and the fixing portion 32.

[0222] The limiting part 33 and the fixing part 32 can clamp the wall part 23 from both sides, thereby fixing the electrode terminal 30 to the wall part 23.

[0223] In some embodiments, the limiting portion 33 is annular.

[0224] In some embodiments, the battery cell 7 further includes a seal 60, at least a portion of which is clamped between the limiting portion 33 and the wall portion 23 to seal the electrode lead-out hole 231.

[0225] In some embodiments, the seal 60 is made of rubber or plastic.

[0226] In some embodiments, the limiting portion 33 protrudes outward from the terminal body 31 in the radial direction of the electrode lead-out hole 231 by a larger dimension than the fixing portion 32 protrudes outward from the terminal body 31. The larger size of the limiting portion 33 allows for better compression of the sealing member 60, improving sealing performance.

[0227] In some embodiments, the fixing part 32 is located outside the wall part 23.

[0228] In some embodiments, a second recess 311 is provided on the outer side of the terminal body 31, and a third through hole 312 for injecting electrolyte is provided at the bottom of the second recess 311.

[0229] In some embodiments, the battery cell 7 further includes a sealing plate 70, at least a portion of which is received in the second recess 311 and used to seal the third through hole 312.

[0230] In some embodiments, the sidewall of the second recess 311 is provided with a stepped surface, and the sealing plate 70 abuts against the stepped surface and is welded to the terminal body 31.

[0231] In some embodiments, the battery cell 7 is a cylindrical battery cell.

[0232] Figure 11 This is a schematic diagram of the structure of a battery cell before the fixing part is formed, according to some embodiments of this application.

[0233] like Figure 7 , Figure 8 and Figure 11 As shown, in some embodiments, the fixing part 32 is configured to be folded after the electrode terminal 30 passes through the electrode lead-out hole 231.

[0234] For example, during assembly, the electrode terminal 30 is first passed through the electrode lead-out hole 231, the second through hole 41 and the first through hole 51, and then a portion of the electrode terminal 30 is folded over to form a fixing part 32, and then the electrode terminal 30 is riveted to the wall part 23.

[0235] When the electrode terminal 30 is folded, the material will flow towards the fold, causing the outer periphery of the electrode terminal 30 to expand. The protective part 50 can restrict the flow of material during the molding process of the fixing part 32, reduce the radial expansion of the electrode terminal 30, reduce the risk of the insulating part 40 cracking under pressure during the molding process of the fixing part 32, and improve the reliability of the battery cell 7.

[0236] In some embodiments, the electrode terminal 30 has a third recess 34 before being mounted to the wall portion 23, and a fixing portion 32 is formed by folding the sidewall of the third recess 34. After the fixing portion 32 is formed, the remaining portion of the third recess 34 forms a second recess 311.

[0237] In some embodiments, the fixing part 32 is located on the outside of the wall part 23. Folding the electrode terminal 30 from the outside can reduce the molding difficulty of the electrode terminal 30 and simplify the process.

[0238] Figure 12 Partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application; Figure 13 for Figure 12 Enlarged view of the area within the circle; Figure 14 This is a schematic diagram of the insulating and protective components of a battery cell provided in some embodiments of this application.

[0239] Reference Figures 12 to 14 In some embodiments, the first portion 52 is embedded inside the insulating member 40.

[0240] Embedding the first part 52 into the insulating part 40 can keep the relative position of the insulating part 40 and the protective part 50 fixed during the assembly of the battery cell 7, so that the protective part 50 can better limit the deformation of the electrode terminal 30 during the assembly process, thereby better protecting the insulating part 40 and reducing the risk of the insulating part 40 cracking.

[0241] In some embodiments, the insulating member 40 is provided with a fourth recess 45, which is recessed from the wall of the second through hole 41; the first portion 52 is inserted into the fourth recess 45.

[0242] In some embodiments, the protective component 50 and the insulating component 40 are integrally injection molded. Integral injection molding can improve the fixing strength between the insulating component 40 and the protective component 50.

[0243] In some embodiments, the minimum distance between the protective member 50 and the fixing part 32 in the thickness direction Z is greater than the minimum distance between the protective member 50 and the wall part 23. During the molding process of the fixing part 32, material accumulation is more likely to occur at the connection between the fixing part 32 and the terminal body 31. The protective member 50 is closer to the fixing part 32, which can effectively limit the deformation of the terminal body 31 and reduce the risk of the terminal body 31 crushing the insulating member 40.

[0244] In some embodiments, a fourth recess 45 is provided on the insulating body 42.

[0245] Figure 15 This is a partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application.

[0246] like Figure 15As shown, in some embodiments, the bottom wall 211 of the housing 21 is a wall portion 23, and the fixing portion 32 is located inside the wall portion 23.

[0247] For example, when assembling the electrode terminal 30, the electrode terminal 30 can be inserted into the electrode lead-out hole 231 from the outside of the wall portion 23 and pass through the first through hole 51 and the second through hole 41. Then, the external device extends into the housing 21 and folds the electrode terminal 30 to form the fixing portion 32.

[0248] Figure 16 This is a partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application.

[0249] like Figure 16 As shown, in some embodiments, the electrode terminal 30 is fixed to the wall portion 23 by a protective member 50.

[0250] In some embodiments, the electrode terminal 30 is fixed to the protective member 50.

[0251] In some embodiments, the outer periphery of the electrode terminal 30 is provided with a fifth recess 35, and the fixing part 32 is located on one side of the fifth recess 35 and is used to define the fifth recess 35 with the terminal body 31.

[0252] A portion of the protective member 50 is inserted into the fifth recess 35 to fix the protective member 50 to the electrode terminal 30.

[0253] In some embodiments, along the thickness direction Z, the projection of the fixing part 32 is located within the projection of the electrode lead-out hole 231.

[0254] In some embodiments, along the thickness direction Z, the projection of the fixing part 32 is located within the projection of the second through hole 41.

[0255] In some embodiments, the fixing part 32 is configured to be folded after the electrode terminal 30 passes through the electrode lead-out hole 231 and the first through hole 51.

[0256] During the folding and forming process of the fixing part 32, the electrode terminal 30 is restricted by the limiting member, thereby reducing the risk of the electrode terminal 30 pressing the insulating member 40.

[0257] In some embodiments, at least a portion of the insulating member 40 is located between the wall portion 23 and the protective member 50 in the thickness direction Z.

[0258] In some embodiments, a portion of the wall portion 23 is located between the limiting portion 33 and the protective member 50 in the thickness direction Z, so that the electrode terminal 30 and the protective member 50 are fixed to the wall portion 23.

[0259] In some embodiments, a portion of the protective member 50 is located radially between the terminal body 31 and the insulating member 40 in the electrode lead-out hole 231. The protective member 50 can separate the terminal body 31 from the insulating member 40 to reduce the risk of the terminal body 31 directly compressing or stretching the insulating member 40.

[0260] According to some embodiments of this application, this application also provides a battery comprising multiple battery cells of any of the above embodiments.

[0261] According to some embodiments of this application, this application also provides an electrical device, including a battery cell from any of the above embodiments, wherein the battery cell is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize battery cells.

[0262] Reference Figures 4 to 10 This application provides a battery cell 7, which includes an electrode assembly 10, a housing 20, electrode terminals 30, an insulating component 40, and a protective component 50.

[0263] The housing 20 includes a housing 21 and an end cap 22. The housing 21 has an opening, and the end cap 22 is used to close the opening. The housing 20 includes a bottom wall 211 opposite to the end cap 22. The bottom wall 211 is provided with an electrode lead-out hole 231.

[0264] The electrode assembly 10 is housed within the housing 20, and the end of the electrode assembly 10 facing the bottom wall 211 is provided with a tab 11.

[0265] The protective component 50 is provided with a first through hole 51, and the insulating component 40 is provided with a second through hole 41. The electrode terminal 30 includes a terminal body 31, a fixing part 32, and a limiting part 33. The terminal body 31 passes through the first through hole 51, the second through hole 41, and the electrode lead-out hole 231. The limiting part 33 is located inside the bottom wall 211 and surrounds the terminal body 31. The fixing part 32 is located outside the bottom wall 211 and surrounds the terminal body 31.

[0266] The insulating element 40 includes an insulating body 42 and an insulating protrusion 43. The second through hole 41 penetrates the insulating body 42 along the thickness direction Z of the bottom wall 211. At least a portion of the insulating body 42 is located between the fixing part 32 and the bottom wall 211. The insulating protrusion 43 protrudes from the surface of the insulating body 42 away from the bottom wall 211.

[0267] The protective component 50 includes a first portion 52 and a second portion 53. The projection of the first portion 52 along the thickness direction Z lies within the projection of the insulating body 42 along the thickness direction Z, and the first portion 52 is sandwiched between the insulating body 42 and the fixing part 32. The second portion 53 is connected to the first portion 52, and along the radial direction of the electrode lead-out hole 231, the second portion 53 protrudes inward from the hole wall of the second through hole 41. The second portion 53 defines the first through hole 51.

[0268] The tensile strength of the protective component 50 is greater than that of the insulating component 40. The fixing part 32 is configured to be folded after the electrode terminal 30 passes through the electrode lead-out hole 231.

[0269] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0270] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this 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 described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a wall portion, wherein the wall portion is provided with electrode lead-out holes; An electrode assembly, housed within the housing, wherein the electrode assembly is a wound structure or a stacked structure, and the electrode assembly includes tabs; An electrode terminal is electrically connected to the electrode tab, and the electrode terminal includes a terminal body passing through the electrode lead-out hole and a fixing part connected to the terminal body; An insulating member is disposed around the terminal body and has a second through hole, at least a portion of the insulating member being located between the fixing portion and the wall portion to insulatingly isolate the fixing portion and the wall portion; A protective component is disposed around the terminal body and in contact with the insulating component. The tensile strength of the protective component is greater than that of the insulating component. The material of the protective component includes metal or ceramic. The protective component separates the insulating component from the fixing part, and the insulating component separates the protective component from the wall part. Along the radial direction of the electrode lead-out hole, a portion of the protective component protrudes inward from the hole wall of the second through hole.

2. The battery cell according to claim 1, characterized in that, The tensile strength of the protective component is greater than the tensile strength of the electrode terminal.

3. The battery cell according to claim 1, characterized in that, The protective component has a first through hole, and the terminal body passes through the first through hole, the second through hole, and the electrode lead-out hole.

4. The battery cell according to claim 3, characterized in that, Along the radial direction of the electrode lead-out hole, a portion of the protective member protrudes inward from the hole wall of the electrode lead-out hole.

5. The battery cell according to claim 3, characterized in that, The first through hole, the second through hole, and the electrode lead-out hole are coaxially arranged.

6. The battery cell according to claim 3, characterized in that, At least a portion of the wall of the first through hole abuts against the outer periphery of the terminal body.

7. The battery cell according to claim 3, characterized in that, The portion of the protective component that protrudes from the wall of the second through hole is annular.

8. The battery cell according to claim 3, characterized in that, In the thickness direction of the wall portion, the fixing portion at least partially overlaps with the wall portion, and at least a portion of the insulating member and at least a portion of the protective member are located between the wall portion and the fixing portion.

9. The battery cell according to claim 8, characterized in that, The width of the projection of the fixing part onto the insulating member along the thickness direction is greater than or equal to 0.5 mm.

10. The battery cell according to claim 8, characterized in that, The protective component includes a first part and a second part connected to the first part. The first part overlaps with the insulating component along the thickness direction and is radially connected to the electrode lead-out hole. The second part protrudes inward from the hole wall of the second through hole.

11. The battery cell according to claim 10, characterized in that, In the thickness direction, the projection of the second through hole is located within the projection of the electrode lead-out hole.

12. The battery cell according to claim 10, characterized in that, The first part is embedded inside the insulating element.

13. The battery cell according to claim 10, characterized in that, Along the thickness direction, at least a portion of the first part is located between the fixing part and the insulating member.

14. The battery cell according to claim 8, characterized in that, The insulating element includes an insulating body and an insulating protrusion. The second through hole penetrates the insulating body along the thickness direction. At least a portion of the insulating body is located between the fixing portion and the wall portion. The insulating protrusion protrudes from the surface of the insulating body away from the wall portion. At least a portion of the protective member is located between the fixing portion and the insulating body in the thickness direction, and is located between the insulating protrusion and the terminal body in the radial direction of the second through hole.

15. The battery cell according to claim 14, characterized in that, The diameter of the second through hole is D1, the diameter of the first through hole is D2, and the outer diameter of the protective component is D3; the insulating protrusion is annular, and the inner diameter of the insulating protrusion is D4; D1, D2, D3, and D4 satisfy the condition: D1-D2 > D4-D3.

16. The battery cell according to claim 1, characterized in that, The electrode terminal also includes a limiting portion disposed around the terminal body, and the limiting portion and the fixing portion are respectively located on both sides of the wall portion in the thickness direction of the wall portion.

17. The battery cell according to claim 1, characterized in that, The fixing part is located inside the wall portion; or... The fixing part is located on the outside of the wall.

18. The battery cell according to claim 1, characterized in that, The fixing part is configured to be folded into shape after the electrode terminal passes through the electrode lead-out hole.

19. The battery cell according to claim 1, characterized in that, The protective component is fixedly connected to the insulating component.

20. The battery cell according to claim 19, characterized in that, The protective component and the insulating component are integrally injection molded.

21. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap, the shell having an opening and the end cap covering the opening; The housing includes a bottom wall disposed opposite to the end cap, and the wall portion is the bottom wall.

22. The battery cell according to any one of claims 1-21, characterized in that, The battery cell is a cylindrical battery cell.

23. A battery, characterized in that, It includes multiple battery cells according to any one of claims 1-22.

24. An electrical appliance, characterized in that, Includes the battery according to claim 23, the battery being used to provide electrical energy.

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