Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, a frame and an electrode assembly. The frame is arranged in the shell. The shell and the frame jointly enclose a containing space. The electrode assembly comprises an electrode body and a tab. The electrode body is connected with the tab on at least one side in a first direction. The electrode body is arranged in the containing space and has a main body part and a protruding part. The frame surrounds the circumferential side of the electrode assembly to fix the electrode assembly. The main body part is connected with the protruding part on at least one side in the first direction. At least one side of the main body part in a second direction protrudes from at least part of the protruding part. The protruding part is in clearance fit with the frame on at least one side in the second direction. The first direction intersects with the second direction. The application is beneficial to improving the cycle life of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical appliance. 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. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the cycle life of individual battery cells is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the cycle life of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing; a frame disposed within the housing, the housing and the frame together forming a receiving space; an electrode assembly, comprising an electrode body and a tab, the electrode body having a tab connected to at least one side along a first direction, the electrode body being disposed in the receiving space and having a main body portion and a protrusion, the frame surrounding the periphery of the electrode assembly to fix the electrode assembly; the main body portion having a protrusion connected to at least one side along the first direction, and the main body portion protruding from at least a portion of the protrusion along at least one side along a second direction, such that the protrusion is in clearance fit with the frame along at least one side along the second direction, the first direction and the second direction intersecting.

[0006] In some embodiments of the first aspect, the housing can protect the frame and electrode assembly located inside it to improve the reliability of the battery cell. The electrode body included in the electrode assembly can be disposed within the receiving space formed by the frame and the housing to improve the protection of the battery cell and improve the cycle life of the battery cell. Furthermore, by configuring the electrode body as having a main body portion and a protrusion connected as described above, and allowing at least one side of the protrusion along the second direction to be clearance-fitted with the frame, the possibility of stress concentration caused by interference between the electrode assembly and the frame can be effectively reduced, thereby reducing the risk of damage to the electrode assembly and thus improving the cycle life of the battery cell.

[0007] In some embodiments, the frame has a through hole communicating with a receiving space, the receiving space and the through hole being arranged along a first direction, and at least a portion of the tabs being disposed in the through hole.

[0008] In the above technical solution, at least a portion of the tabs included in the electrode assembly can be disposed within the through holes of the frame, which is beneficial to make the electrode assembly and the frame more compact, thereby improving the structural compactness of the battery cell.

[0009] In some embodiments, the tab includes a negative tab and a positive tab; the negative tab and the positive tab are both connected to the same side of the electrode body along the first direction; or, the negative tab is connected to one side of the electrode body along the first direction, the positive tab is connected to the other side of the electrode body along the first direction, and the frame has through holes on both sides along the first direction, at least a portion of the negative tab is disposed in one of the through holes, and at least a portion of the positive tab is disposed in the other through hole.

[0010] In the above technical solutions, the negative electrode tab and the positive electrode tab can be set according to the different layout methods, which helps to improve the structural flexibility of the battery cell.

[0011] In some embodiments, the main body is connected to protrusions on both sides along the first direction, and / or, at least a portion of the protrusions protrude from both sides along the second direction.

[0012] The above technical solution can further reduce the possibility of stress concentration caused by interference between the electrode assembly and the frame, thereby improving the cycle life of the battery cell.

[0013] In some embodiments, the electrode tab includes a negative electrode tab and a positive electrode tab, the electrode body includes a negative electrode sheet and a positive electrode sheet stacked along its own thickness direction, the main body includes a first main body portion constituting the negative electrode sheet and a second main body portion constituting the positive electrode sheet, the protrusion includes a first protrusion constituting the negative electrode sheet and a second protrusion constituting the positive electrode sheet, the first protrusion and the second protrusion are arranged in a one-to-one correspondence along the thickness direction, at least one of the first main body portion and the first protrusion is connected to the negative electrode tab, at least one of the second main body portion and the second protrusion is connected to the positive electrode tab, and the first direction, the second direction and the thickness direction intersect each other.

[0014] In the above technical solution, the electrode assembly is set as a stacked structure, which facilitates processing and manufacturing.

[0015] In some embodiments, within the same projection plane perpendicular to the thickness direction, the orthographic projection of the first protrusion completely covers the orthographic projection of the second protrusion, and / or, the orthographic projection of the first main body completely covers the orthographic projection of the second main body.

[0016] By setting it up in the above way, the negative electrode can cover the positive electrode, so that during the charging and discharging process of the battery cell, the lithium ions that are extracted from the positive electrode can be inserted into the negative electrode, thereby reducing the risk of lithium plating and thus helping to improve the cycle life of the battery cell.

[0017] In some embodiments, the maximum dimension of the first protrusion in the first direction is L1, and the maximum dimension of the first main body portion extending beyond the first protrusion along one side of the second direction is H1, wherein 2mm≤L1≤10mm and 0.3mm

[0018] By setting it up in the above way, interference between the electrode assembly and the frame can be reduced, and the loss of energy density of the battery cells can also be reduced.

[0019] In some embodiments, 2mm≤L1≤5mm, and / or, 2mm≤L2≤5mm, and / or, 2mm≤B≤5mm.

[0020] The above-mentioned setup helps to further reduce the loss of energy density in individual battery cells.

[0021] In some embodiments, the first protrusion has a first wall on at least one side along the second direction, the first wall being in clearance fit with the frame along the second direction, the first wall having a first end and a second end opposite to each other along the first direction, the first end being connected to the first main body portion; the second protrusion has a second wall on at least one side along the second direction, the second wall being in clearance fit with the frame along the second direction, the second wall having a third end and a fourth end opposite to each other along the first direction, the third end being connected to the second main body portion; in the same projection plane perpendicular to the thickness direction, the orthographic projection of the first wall is a line segment parallel to the first direction, or, the orthographic projection of the first wall is a line segment intersecting the first direction, or, the orthographic projection of the first wall is a curved structure; in the same projection plane perpendicular to the thickness direction, the orthographic projection of the second wall is a line segment parallel to the first direction, or, the orthographic projection of the second wall is a line segment intersecting the first direction, or, the orthographic projection of the second wall is a curved structure.

[0022] The above scheme is conducive to improving the flexibility of battery cell processing and manufacturing.

[0023] In some embodiments, the frame includes two supports and two end plates, the two supports being arranged opposite each other along a first direction, the two end plates being arranged opposite each other along a second direction, and the supports being connected to the end plates.

[0024] In the above technical solution, by setting the frame to be composed of two supports and two end plates connected in sequence, it is beneficial to reduce the difficulty of frame manufacturing.

[0025] ​In some embodiments, one of the end plate and the bracket is provided with a connection hole, and the other covers a portion of the connection hole. The end plate and the bracket are connected by a thermoplastic component, and at least a portion of the connection hole is provided with a thermoplastic component.

[0026] In the above technical solution, the end plate and the bracket are connected by heat fusion, which can improve the connection strength between them. Furthermore, by setting the connection hole to extend beyond the end plate or the bracket, the heat fusion component can fill the connection hole after the end plate and the bracket are connected by the heat fusion component, thereby reducing the possibility of it accumulating between the end plate and the bracket.

[0027] In some embodiments, the end plate is provided with a connecting hole, which is spaced apart from the protrusion along the second direction, and the orthographic projection of the connecting hole along the second direction is completely offset from the orthographic projection of the main body along the second direction.

[0028] By setting it in the above manner, the possibility of the hot melt component overflowing along the connection hole and contacting the main body or protrusion can be reduced, which is beneficial to improving the cycle life of the battery cell.

[0029] In some embodiments, along one side of the first direction, the protrusion extends beyond the maximum dimension of the main body by L, and the connecting hole extends beyond the maximum dimension of the bracket by L3, wherein 0 < L3 ≤ L, and 2 mm ≤ L ≤ 10 mm.

[0030] By setting it in the above manner, while ensuring that the connecting hole is spaced apart from the protrusion and the main body, the connecting hole is designed to be long enough beyond the size of the bracket. This allows the connecting hole to provide more space for the overflowing hot melt component, which helps to improve the reliability of the hot melt connection between the bracket and the end plate.

[0031] In some embodiments, 0 < L3 ≤ 2 mm. By further setting the value of L3 within the above range, it is possible to better ensure that the hot melt overflowing from the connection hole does not contact the main body or protrusion, thereby improving the cycle life of the battery cell.

[0032] In some embodiments, the electrode assembly has a stacked structure.

[0033] Since the electrode assembly with a stacked structure is prone to dispersion, it is easy to interfere with the frame under vibration or other operating conditions. Therefore, by setting it in this way, the possibility of stress concentration caused by interference between the electrode assembly and the frame can be effectively reduced, thereby reducing the risk of damage to the electrode assembly and thus improving the cycle life of the battery cell.

[0034] In the above technical solution, the outer casing can protect the frame and electrode assembly located inside it, thereby improving the reliability of the battery cell.

[0035] Secondly, this application provides a battery device including a plurality of battery cells provided according to any embodiment of the first aspect.

[0036] Thirdly, this application provides an electrical device that includes a plurality of battery devices provided according to any embodiment of the second aspect or a plurality of battery cells provided according to any embodiment of the first aspect, wherein the battery cells or battery devices are used to store electrical energy or provide electrical energy.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. 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 This application provides a schematic diagram of the structure of a battery cell assembly in a battery device according to some embodiments;

[0041] Figure 3 This application provides a schematic diagram of the structure of a battery device according to some embodiments;

[0042] Figure 4 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0043] Figure 5 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0044] Figure 6 A partial cross-sectional view of a battery cell provided for other embodiments of this application;

[0045] Figure 7 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0046] Figure 8 This is a schematic diagram of the structure of the negative electrode in a battery cell provided in some embodiments of this application;

[0047] Figure 9This application provides a schematic diagram of the structure of the positive electrode in a single battery cell, based on some embodiments.

[0048] Figure 10 This application provides a schematic diagram of the structure of an electrode assembly in a battery cell, based on some embodiments.

[0049] Figure 11 This application provides a schematic diagram of the structure of a negative electrode in a battery cell, as shown in other embodiments.

[0050] Figure 12 This application provides a schematic diagram of the structure of a negative electrode in a battery cell, as shown in other embodiments.

[0051] Figure 13 A schematic diagram of the structure of the negative electrode in a battery cell is provided for some embodiments of this application;

[0052] Figure 14 A partial structural schematic diagram of an electrode assembly in a battery cell provided for other embodiments of this application;

[0053] Figure 15 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0054] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0055] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; 400, Battery cell assembly;

[0056] 1. Battery cell; 2. Housing; 210. First housing; 220. Second housing;

[0057] 10. Frame; 101. Accommodation space; 102. Through hole; 11. Bracket; 12. End plate; 121. Connection hole;

[0058] 20. Electrode assembly; 21. Electrode body; 201. Negative electrode; 202. Positive electrode;

[0059] 211, Main body portion; 2111, First main body portion; 2112, Second main body portion; 212, Protrusion; 2121, First protrusion; 2122, Second protrusion; 2101, First wall; 2011, First end; 2012, Second end; 2102, Second wall; 2013, Third end; 2014, Fourth end; 22, Electrode; 221, Negative electrode; 222, Positive electrode;

[0060] 30. Outer shell; 31. Housing; 32. End cap; 40. Hot melt component;

[0061] X, first direction; Y, second direction; Z, thickness direction. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 C can represent: A existing alone, A and C existing simultaneously, or C existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0067] 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.

[0068] In this application, "multiple" means two or more (including two).

[0069] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0070] 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.

[0071] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0072] In related technologies, the corners of the internal electrode components of a battery cell are prone to interference with mechanical parts, such as aluminum casings, which may cause damage to the corners and reduce the cycle life of the battery cell. The corners of the electrode components refer to, for example, the four right-angled corners when the electrode components are rectangular.

[0073] Based on the above-mentioned technical problems, this application provides a battery cell including a shell, a frame, and an electrode assembly. The frame is disposed inside the shell, and the shell and the frame together enclose a receiving space. The electrode assembly includes an electrode body and a tab. The electrode body is connected to a tab on at least one side along a first direction. The electrode body is disposed in the receiving space and has a main body portion and a protrusion. The frame surrounds the periphery of the electrode assembly to fix the electrode assembly. The main body portion is connected to a protrusion on at least one side along the first direction, and the main body portion protrudes beyond at least a portion of the protrusion on at least one side along a second direction, so that the protrusion on at least one side along the second direction is in clearance fit with the frame. The first direction and the second direction intersect.

[0074] By placing the electrode body, which is part of the electrode assembly, within the accommodating space enclosed by the frame and the housing, the protection of the electrode assembly is improved, which is beneficial to improving the cycle life of the battery cell. Furthermore, by configuring the electrode body as having a main body portion and a protrusion connected as described above, and allowing at least one side of the protrusion along the second direction to be clearance-fitted with the frame, the possibility of stress concentration caused by interference between the electrode assembly and the frame can be effectively reduced, thereby reducing the risk of damage to the electrode assembly and thus improving the cycle life of the battery cell.

[0075] The technical solutions described in the embodiments of this application are applicable to various battery devices or electrical equipment that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0076] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0077] For example, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may contain a motor 300, a controller 200, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle 1000.

[0078] Please see Figure 2 and Figure 3The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 400 for providing voltage and capacity. The battery cell assembly 400 may include a plurality of battery cells 1, which are connected in series, parallel or mixed connection via a busbar.

[0079] In some embodiments, the battery cell assembly 400 is typically formed by arranging a plurality of battery cells 1.

[0080] As an example, the battery cell assembly 400 can be a battery module, which is formed by arranging and fixing multiple battery cells 1 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0081] As an example, the battery cell assembly 400 can be a battery module, and the battery cell assembly 400 can be housed in the housing 2 by fixing the battery module in the housing 2.

[0082] As an example, the battery cell assembly 400 can also be housed in the housing 2 by directly fixing multiple battery cells 1 to the housing 2.

[0083] As an example, the housing 2 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a cavity, thereby creating a closed space inside the housing 2 to house the battery cell assembly 400. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0084] As an example, the housing 2 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 2 forms an enclosed space to accommodate the battery cell assembly 400.

[0085] In some embodiments, the housing 2 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 2 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 2 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0086] The box 2 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. This application embodiment does not limit this.

[0087] Specifically, the housing 2 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0088] Please refer to the following: Figures 4 to 7 According to an embodiment of this application, a battery cell 1 is provided, including a housing 30, a frame 10, and an electrode assembly 20. The frame 10 is disposed inside the housing 30, and the housing 30 and the frame 10 together form a receiving space 101. The electrode assembly 20 includes an electrode body 21 and a tab 22. The electrode body 21 is connected to the tab 22 on at least one side along the first direction X. The electrode body 21 is disposed in the receiving space 101 and has a main body portion 211 and a protrusion 212. The frame 10 surrounds the periphery of the electrode assembly 20 to fix the electrode assembly 20. The main body portion 211 is connected to the protrusion 212 on at least one side along the first direction X, and the main body portion 211 protrudes from at least a portion of the protrusion 212 on at least one side along the second direction Y, so that the protrusion 212 is in clearance fit with the frame 10 on at least one side along the second direction Y. The first direction X and the second direction Y intersect.

[0089] In this embodiment, the battery cell 1 can be a polygonal battery cell 1, such as a square battery cell, a blade-shaped battery cell, or a multi-prism battery cell. The first direction X can be the length direction of the large surface of the electrode assembly 20 or the battery cell 1, or it can be the length direction of the frame 10. The second direction Y can be the width direction of the large surface of the electrode assembly 20 or the battery cell 1, or it can be the width direction of the frame 10. Here, "large surface" refers to the surface of the electrode assembly 20 or the battery cell 1 with the largest area.

[0090] The housing 30 is a component used to form the internal environment of the battery cell 1. The internal environment formed therein can be used to house the electrode assembly 20 and the frame 10, as well as to house the electrolyte and other components.

[0091] Optionally, the outer casing 30 may be made of, but is not limited to, metallic or non-metallic materials. For example, metallic materials may be copper, aluminum, or stainless steel; non-metallic materials may be polyethylene, polypropylene, or polyvinyl chloride. For example, the outer casing 30 may be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing 30), or an aluminum-plastic film.

[0092] In some embodiments, the housing 30 can be a sealed structure or a non-sealed structure. As an example, when the housing 30 is a non-sealed structure, the housing 30 serves to protect the multiple electrode assemblies 20.

[0093] For example, in the embodiments of this application, the outer shell 30 is a rigid shell or a hard shell.

[0094] In some embodiments, the housing 30 may include a housing 31 and an end cap 32. The housing 31 has an internal cavity for accommodating the electrode assembly 20 and the frame 10. The housing 31 has an opening, and the end cap 32 is connected to the housing 31 to seal the opening. The housing 31 may have one or more openings. The end cap 32 may also have one or more.

[0095] The shape of the housing 31 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, then a cuboid housing 31 can be selected.

[0096] The shell 31 can be of various shapes, such as a cuboid or prism structure. Of course, the end cap 32 can also have various structures, such as a plate-like structure or a hollow structure with one end open.

[0097] The frame 10 is disposed inside the outer shell 30 and together with the outer shell 30 forms a receiving space 101. The frame 10 can abut against the outer shell 30 and can also be connected to the outer shell 30. The connection method includes, but is not limited to, welding, bonding and fastener connection.

[0098] The frame 10 can be a ring structure, and the ring-shaped frame 10 can be together with the walls on both sides of the outer shell 30 along the thickness direction Z to form a receiving space 101. The receiving space 101 is used to receive the electrode body 21. The frame 10 surrounds the electrode assembly 20 along the circumference of the electrode assembly 20 to bind the electrode assembly 20 and fix the electrode assembly 20 to the frame 10.

[0099] The frame 10 and the housing 30 provide limiting and fixing functions, while also supporting and protecting the electrode assembly 20. This reduces the possibility of displacement or short circuit of the electrode assembly 20 due to vibration or pressure deformation during charging and discharging, thus improving the cycle life of the battery cell 1. Furthermore, the frame 10 and the housing 30 can withstand external impacts, reducing the risk of damage to the electrode assembly 20 and improving its reliability. The tab 22 can be disposed within or outside the receiving space 101.

[0100] The battery cell 1 provided in this application embodiment has a frame 10 inside its outer casing 30 to form a receiving space 101 that accommodates at least part of the electrode assembly 20. This is beneficial to improving the structural strength of the outer casing 30 and the protection of the electrode assembly 20, thereby improving the service life and reliability of the battery cell 1.

[0101] Electrode assembly 20 is the component in battery cell 1 where the electrochemical reaction occurs. Battery cell 1 may contain two electrode assemblies 20, three electrode assemblies 20, or even more electrode assemblies 20. Electrode assembly 20 includes electrode body 21 and tabs 22. Electrode body 21 has a main body portion 211 and a protrusion 212 connected along a first direction X. The phrase "at least one side of electrode body 21 connected to tab 22 along the first direction X" can also be understood as at least one of the main body portion 211 and the protrusion 212 being connected to a side of the body portion 211 facing away from each other along the first direction X. Electrode assembly 20 may have only one tab 22, or it may have two tabs 22, namely a negative tab 221 and a positive tab 222 with opposite polarities.

[0102] like Figure 6 As shown, the protrusion 212 can extend from one side edge of the main body 211 along the first direction X. In this structure, the side of the main body 211 away from the protrusion 212 along the first direction X can be connected to the tab 22, or the side of the protrusion 212 away from the main body 211 along the first direction X can also be connected to the tab 22, or both the main body 211 and the protrusion 212 can be connected to the tab 22.

[0103] like Figure 5 and Figure 7 As shown, the main body 211 can have protrusions 212 extending from both sides of the first direction X. In this structure, one of the protrusions 212 can be connected to a tab 22, or the two protrusions 212 can be connected to tabs 22 respectively.

[0104] like Figures 5 to 7As shown, "the main body 211 has a protrusion 212 connected to at least one side along the first direction X, and the main body 211 protrudes from at least a portion of the protrusion 212 along at least one side along the second direction Y, so that the protrusion 212 is in clearance fit with the frame 10 along at least one side along the second direction Y." This can be understood as at least one of the two end faces of the protrusion 212 that are opposite each other in the second direction Y is not coplanar with the main body 211. "Clear fit" means that there is a gap between the protrusion 212 and the frame 10 along at least one side along the second direction Y, so that the side of the main body 211 with the protrusion 212 along the first direction X also has a gap with the frame 10. In other words, from the electrode body 21... Overall, at least one notch exists at one of the four right-angled corners of the electrode body 21. This notch can be polygonal, arc-shaped, or other shapes. By setting it in this way, the main body 211 protruding from the protrusion 212 along the second direction Y can have a gap with the frame 10 in the first direction X, and the protrusion 212 can also have a gap with the frame 10 in the second direction Y. This can reduce the possibility of stress concentration caused by interference between the electrode assembly 20 and the frame 10, and also reduce the risk of folding, powder shedding, and demolding damage at the corner positions of the electrode assembly 20. This helps to reduce the risk of damage to the electrode assembly 20, and thus helps to improve the cycle life of the battery cell 1.

[0105] Optionally, the electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked. In the embodiments of this application, the electrode assembly 20 is illustrated as a rectangular structure, i.e., having four right-angled corners. Correspondingly, the frame 10 is a rectangular structure. However, it is understood that the electrode assembly 20 can also be set as other polygonal structures, and the frame can also be set as other polygonal structures.

[0106] In some embodiments, the electrode assembly 20 has a stacked structure.

[0107] Since the electrode assembly 20 with its stacked structure is prone to dispersion, it is easy to interfere with the frame 10 under vibration or other operating conditions. Therefore, by setting it in this way, the possibility of stress concentration caused by interference between the electrode assembly 20 and the frame 10 can be effectively reduced, thereby reducing the risk of damage to the electrode assembly 20 and thus improving the cycle life of the battery cell 1.

[0108] Optionally, the frame 10 can be a one-piece molded structure, or the frame 10 can be formed by welding, bonding or bolting multiple components.

[0109] Optionally, the frame 10 can be made of a material with certain strength and rigidity, such as metal or composite materials. The shape and size of the frame 10 can be customized according to the design requirements of the housing space 101 and the electrode assembly 20 to improve the overall structural stability of the battery cell 1.

[0110] Optionally, the tab 22 can be connected to the electrode body 21 by welding, riveting, or other methods to improve the reliability and stability of the connection between the two. Alternatively, the tab 22 can be integrally formed with the electrode body 21 and formed by processes such as cutting.

[0111] In some embodiments, the frame 10 has a through hole 102 communicating with the receiving space 101, the receiving space 101 and the through hole 102 are arranged along a first direction X, and at least a portion of the tabs 22 are disposed in the through hole 102.

[0112] The via 102 is used to accommodate a portion or all of the tabs 22 to fix the tabs 22. The tabs 22 arranged in the via 102 can be staggered or stacked.

[0113] By providing a through hole 102 on the frame 10, the electrode tab 22 can extend out from the receiving space 101 to connect with the external circuit. The position and size of the through hole 102 can be designed according to the position and size of the electrode tab 22 to ensure that the electrode tab 22 can be smoothly led out and fixed. Furthermore, by setting it in the above manner, space can be fully utilized, making the electrode assembly 20 and the frame 10 more compact, which is beneficial to improving the structural compactness of the battery cell 1.

[0114] Optionally, the tab 22 can be entirely located within the through hole 102, which helps to improve the space utilization of the battery cell 1. Alternatively, the tab 22 can also be partially located within the through hole 102. When only a portion of the tab 22 is disposed within the through hole 102, the other portion of the tab 22 can optionally be disposed within the receiving space 101. Alternatively, the other portion of the tab 22 can extend to the outside of the frame 10. Alternatively, the tab 22 can have a portion disposed within the through hole 102, a portion disposed within the receiving space 101, and a portion extending to the outside of the frame 10.

[0115] The through hole 102 refers to a hole that penetrates the frame 10 in the first direction X. It can be a regular shape or an irregular shape. The tab 22 is located inside the through hole 102 and can at least partially abut against the inner wall of the through hole 102 to reduce the possibility of displacement of the tab 22 and improve the shaping effect of the tab 22.

[0116] In some embodiments, the tab 22 includes a negative tab 221 and a positive tab 222, which are respectively connected to different positions of the electrode body 21 to realize the positive and negative connection of the battery cell 1.

[0117] Please see Figure 7 In some embodiments, the negative electrode tab 221 and the positive electrode tab 222 are both connected to the same side of the electrode body 21 along the first direction X.

[0118] By setting it in this way, the frame 10 can have a through hole 102 only on one side of the first direction X, which can simplify the structure of the frame 10, facilitate processing and manufacturing, reduce costs, and also help improve the structural strength of the frame 10.

[0119] Optionally, when the electrode body 21 has a protrusion 212, the negative electrode tab 221 and the positive electrode tab 222 can both be connected to the body part 211, or the negative electrode tab 221 and the positive electrode tab 222 can both be connected to the protrusion 212.

[0120] Optionally, a through hole 102 may be provided on one side of the frame 10 along the first direction X, and at least a portion of the negative electrode tab 221 and at least a portion of the positive electrode tab 222 may be accommodated in the same through hole 102. Alternatively, the frame 10 may also be provided on one side of the first direction X, with two through holes 102 spaced apart along the second direction Y, at least a portion of the negative electrode tab 221 disposed in one of the through holes 102 and at least a portion of the positive electrode tab 222 disposed in the other through hole 102.

[0121] Please see Figure 5 and Figure 6 In other embodiments, the negative tab 221 is connected to one side of the electrode body 21 along the first direction X, and the positive tab 222 is connected to the other side of the electrode body 21 along the first direction X. The frame 10 has through holes 102 on both sides along the second direction Y. At least a portion of the negative tab 221 is disposed in one of the through holes 102, and at least a portion of the positive tab 222 is disposed in the other through hole 102.

[0122] This configuration further improves the isolation between the negative tab 221 and the positive tab 222, thereby reducing the risk of short circuits and improving the reliability of the battery cell 1. It also allows for a larger installation space for both the negative tab 221 and the positive tab 222, increasing their area and thus improving their overcurrent area, which in turn enhances the charge and discharge performance of the battery cell 1.

[0123] Optionally, when the electrode body 21 has a protrusion 212, one of the negative electrode tab 221 and the positive electrode tab 222 is connected to the side of the body 211 away from the protrusion 212 along the first direction X, and the other is connected to the side of the protrusion 212 away from the body 211 along the first direction X.

[0124] The battery cell 1, negative tab 221 and positive tab 222 provided in some embodiments of this application can be arranged according to the above-mentioned layout methods, which is beneficial to improving the structural flexibility of the battery cell 1.

[0125] like Figure 5 and Figure 7 As shown, in some embodiments, the main body 211 is connected to protrusions 212 on both sides along the first direction X.

[0126] By setting the number of protrusions 212 to two, and having the main body 211 protrude from at least one side of the protrusions 212 along the second direction Y, so that there are at least two notches in the four right-angle corners of the electrode body 21, it is beneficial to further reduce the interference between the electrode assembly 20 and the frame 10, thereby further reducing the risk of folding, powder shedding, and demolding damage at the corner positions of the electrode assembly 20, and further improving the cycle life of the battery cell 1.

[0127] Optionally, the main body 211 has protrusions 212 connected to both sides along the first direction X, and along the second direction Y, at least one protrusion 212 has a tab 22 connected to the side opposite to the main body 211. Figure 5 As shown, the main body 211 has protrusions 212 connected to both sides along the first direction X. Along the second direction Y, one of the protrusions 212 is connected to a positive electrode tab 222 on the side opposite to the main body 211, and the other protrusion 212 is connected to a negative electrode tab 221 on the side opposite to the main body 211.

[0128] like Figure 7 As shown, optionally, the main body 211 is connected to protrusions 212 on both sides along the first direction X, and along the second direction Y, the negative electrode tab 221 and the positive electrode tab 222 can both be connected to the same protrusion 212.

[0129] In some embodiments, the main body portion 211 protrudes from at least a portion of the protrusion 212 on both sides along the second direction Y.

[0130] By setting it in this way, at least two of the four right-angle corners of the electrode body 21 will have notches, which will help to further reduce the interference between the electrode assembly 20 and the frame 10. This will further reduce the risk of folding, powdering, and demolding damage at the corner positions of the electrode assembly 20, thereby further improving the cycle life of the battery cell 1.

[0131] For example, such as Figure 5 As shown, the main body 211 is connected to protrusions 212 on both sides along the first direction X, and the main body 211 protrudes entirely from the protrusions 212 on both sides along the second direction Y; as Figure 12 As shown, the main body 211 has protrusions 212 on both sides along the first direction X, and the main body 211 also protrudes from a portion of the protrusions 212 on both sides along the second direction Y. This arrangement ensures that there are notches at all four right-angled corners of the electrode body 21, which helps to further reduce interference between the electrode assembly 20 and the frame 10. This further reduces the risk of folding, powder shedding, and demolding damage at the corner positions of the electrode assembly 20, thereby further improving the cycle life of the battery cell 1.

[0132] Please see Figure 4 , Figures 8 to 10 In some embodiments, the tab 22 includes a negative tab 221 and a positive tab 222. The electrode body 21 includes a negative electrode 201 and a positive electrode 202 stacked along its own thickness direction Z. The main body 211 includes a first main body 2111 constituting the negative electrode 201 and a second main body 2112 constituting the positive electrode 202. The protrusion 212 includes a first protrusion 2121 constituting the negative electrode 201 and a second protrusion 2122 constituting the positive electrode 202. The first protrusion 2121 and the second protrusion 2122 are arranged in a one-to-one correspondence along the thickness direction Z. At least one of the first main body 2111 and the first protrusion 2121 is connected to the negative tab 221, and at least one of the second main body 2112 and the second protrusion 2122 is connected to the positive tab 222. The first direction X, the second direction Y and the thickness direction Z intersect each other.

[0133] The first main body 2111 is connected to a first protrusion 2121 along at least one side of the first direction X, and the first main body 2111 protrudes from the first protrusion 2121 along at least one side of the second direction Y, so that the first protrusion 2121 is in clearance fit with the frame 10 along at least one side of the second direction Y. The second main body 2112 is connected to a second protrusion 2122 along at least one side of the first direction X, and the second main body 2112 protrudes from the second protrusion 2122 along at least one side of the second direction Y, so that the second protrusion 2122 is in clearance fit with the frame 10 along at least one side of the second direction Y.

[0134] "The first protrusion 2121 and the second protrusion 2122 are arranged in a one-to-one correspondence along the thickness direction Z" means that the number and position of the first protrusion 2121 correspond to the number and position of the second protrusion 2122 along the thickness direction Z. The first protrusion 2121 and the second protrusion 2122 can be set to the same or different shapes and sizes to meet the different requirements of the negative electrode 201 and the positive electrode 202.

[0135] By setting the electrode assembly 20 as a stacked structure, it is convenient to process the negative electrode 201 into a structure having a first main body portion 2111 and a first protrusion portion 2121, and it is also convenient to process the positive electrode 202 into a structure having a second main body portion 2112 and a second protrusion portion 2122, which facilitates processing and manufacturing.

[0136] The electrode body 21 also includes a separator stacked between the negative electrode 201 and the positive electrode 202. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are inserted and extracted back and forth between the negative electrode 201 and the positive electrode 202. The separator is disposed between the negative electrode 201 and the positive electrode 202 to prevent short circuit between the negative electrode 201 and the positive electrode 202, while allowing active ions to pass through.

[0137] Optionally, the surface area of ​​the negative electrode 201 may be the same as or different from the surface area of ​​the positive electrode 202. The surface area refers to the area of ​​the surface of either the negative electrode 201 or the positive electrode 202 in the thickness direction Z.

[0138] For example, the surface area of ​​the negative electrode 201 is greater than the surface area of ​​the positive electrode 202. That is, in the same projection plane perpendicular to the thickness direction Z, the projected area of ​​the negative electrode 201 is greater than the projected area of ​​the positive electrode 202.

[0139] By setting it in this way, the current density per unit area can be reduced, the polarization effect can be mitigated, and the risk of reaction rate decline or local overload can be reduced, thereby improving the performance of the battery cell 1. In addition, the larger surface area of ​​the negative electrode 201 can increase the contact area between the negative electrode active material and the electrolyte, improve the charge and discharge efficiency, and at the same time reduce lithium plating.

[0140] In this embodiment, the electrode assembly 20 can be a stacked structure, which is formed by repeatedly stacking a negative electrode 201, an isolator, a positive electrode 202, and an isolator, and is manufactured by processes such as thermal bonding. The structure of the stacked cell is "...isolator-negative electrode 201-isolator-positive electrode 202-isolator-negative electrode 201-isolator...".

[0141] Please see Figure 10 In some embodiments, within the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the first protrusion 2121 completely covers the orthographic projection of the second protrusion 2122, and / or, the orthographic projection of the first main body 2111 completely covers the orthographic projection of the second main body 2112.

[0142] In other words, in at least one of the four corner notches of the electrode body 21, the negative electrode 201 has an area that covers the positive electrode 202, i.e., the outer contour of the negative electrode 201 protrudes from the outer contour of the positive electrode 202, so as to reduce the risk of lithium plating caused by the edge of the positive electrode 202 directly contacting the electrolyte.

[0143] By setting it in the above manner, the negative electrode 201 can completely cover the positive electrode 202, so that during the charging and discharging process of the battery cell 1, the lithium ions extracted from the positive electrode 202 can be inserted into the negative electrode 201, thereby reducing the risk of lithium plating and thus helping to improve the cycle life of the battery cell 1.

[0144] In some embodiments, multiple negative electrode plates 201 and multiple positive electrode plates 202 are provided, and the multiple negative electrode plates 201 and multiple positive electrode plates 202 are stacked alternately to form an electrode body 21.

[0145] Optionally, along one side of the first direction X, the edge of each first protrusion 2121 facing away from the first main body portion 2111 extends beyond the edge of the adjacent second protrusion 2122 facing away from the second main body portion 2112; and / or, along one side of the first direction X and / or one side of the second direction Y, the edge of each first main body portion 2111 extends beyond the edge of the adjacent second main body portion 2112; and / or, along one side of the second direction Y, the edge of each first protrusion 2121 extends beyond the edge of the adjacent second protrusion 2122.

[0146] Optionally, along one side of the first direction X and along the thickness direction Z, the two outermost first protrusions 2121 extend beyond the edge of the second protrusion 2122 that is opposite to the edge of the first main body 2111, and / or, along one side of the first direction X and / or the second direction Y, the edges of the two outermost first main body 2111 extend beyond the edge of the second main body 2112. And / or, along one side of the second direction Y, the edges of the two outermost first main body 2111 both extend beyond the edge of the second main body 2112.

[0147] Please see Figure 8 , Figures 10 to 13 In some embodiments, the maximum dimension of the first protrusion 2121 in the first direction X is L1, and the first main body portion 2111 extends beyond the maximum dimension of the first protrusion 2121 by H1 along one side of the second direction Y, wherein 2mm≤L1≤10mm and 0.3mm

[0148] "The maximum dimension of the first protrusion 2121 in the first direction X" refers to the maximum dimension of the first protrusion 2121 that exceeds the first main body portion 2111 in the first direction X.​

[0149] By way of example, the value of L1 can be, but is not limited to, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., and the value of H1 can be, but is not limited to, 0.3mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0150] If the values of L1 and H1 are designed to be too small respectively, that is, L1 < 2mm and H1 < 0.3mm, the requirement for processing accuracy will increase, and it is inconvenient to directly cut the negative electrode sheet 201 to form the first main body portion 2111 and the first protruding portion 2121 having the above structural features. If the values of L1 and H1 are designed to be too large respectively, that is, L1 > 10mm and H1 > L1 mm, the area of the negative electrode sheet 201 will be reduced, resulting in a certain loss of energy density of the battery cell 1.

[0151] Therefore, by setting the value of L1 between 2mm and 10mm, inclusive of both end values 2mm and 10mm, and setting the value of H1 between 0.3mm and the value of L1, inclusive of the end value L1, while reducing the interference between the electrode assembly 20 and the frame 10, it facilitates the processing and manufacturing of the negative electrode sheet 201, and also helps reduce the loss of energy density of the battery cell 1.

[0152] Please refer to Figure 9 and Figure 10 , in some embodiments, the maximum dimension of the second protruding portion 2122 in the first direction X is L2, and along one side in the second direction Y, the maximum dimension that the second main body portion 2112 extends beyond the second protruding portion 2122 is H2, wherein 2mm ≤ L2 ≤ 10mm and 0.3mm < H2 ≤ L2.

[0153] "The maximum dimension of the second protruding portion 2122 in the first direction X" refers to the maximum dimension that the second protruding portion 2122 extends beyond the second main body portion 2112 in the first direction X.

[0154] By setting the value of L2 between 2mm and 10mm, inclusive of both end values 2mm and 10mm, and setting the value of H2 between 0.3mm and the value of L2, inclusive of the end value L2, while reducing the interference between the electrode assembly 20 and the frame 10, it facilitates the processing and manufacturing of the positive electrode sheet 202, and also helps reduce the loss of energy density of the battery cell 1.

[0155] Optionally, the values of L1 and L2 can be the same, and of course, they can also be set to be different.

[0156] Please continue to refer to Figure 9 and Figure 10 , in some embodiments, the maximum dimension of the second convex portion 2122 in the first direction X is L2, along one side in the second direction Y, the maximum dimension by which the second main body portion 2112 extends beyond the second convex portion 2122 is H2, wherein L1-B < L2 ≤ L1 and 0.3mm < H2 ≤ L2 and 0.1mm ≤ B ≤ 10mm, B is the maximum dimension by which the negative electrode sheet 201 extends beyond the positive electrode sheet 202 along one side in the first direction X.

[0157] In other words, the area of the negative electrode sheet 201 is larger than that of the positive electrode sheet 202. With this arrangement, the situation where the positive electrode sheet 202 is cut too small can be reduced, which is beneficial for reducing the loss of energy density of the battery cell 1.

[0158] It can be understood that since the negative electrode tab 221 and the positive electrode tab 222 are accommodated in the via hole 102 of the frame 10 along the first direction X, there is a risk that the negative electrode sheet 201 and the positive electrode sheet 202 may contact the frame 10 along the first direction X during assembly. Therefore, in the processing process, the size that allows the negative electrode sheet 201 and the positive electrode sheet 202 to avoid the frame 10 in the first direction X will be considered first. When the processing method is a cutting process, taking the negative electrode sheet 201 as an example, the negative electrode sheet 201 is cut to a dimension L1 along the first direction X to form the first main body portion 2111 and the first convex portion 2121, so that there is a gap between the first main body portion 2111 and the frame 10 in the first direction X. When the negative electrode sheet 201 is cut to the dimension L1 along the first direction X, the dimension of the negative electrode sheet 201 in the second direction Y is also lost. H1 is the dimension lost by the negative electrode sheet 201 in the second direction Y due to cutting to the dimension L1, so that there is a gap between the first convex portion 2121 and the frame 10 in the second direction Y. Therefore, the value of H1 is related to the value of L1, and correspondingly, the value of L2 is related to the value of H2.

[0159] Optionally, 2mm ≤ L1 ≤ 5mm, and / or, optionally, 2mm ≤ L2 ≤ 5mm, and / or, 2mm ≤ B ≤ 5mm.

[0160] The arrangement through the above method is beneficial to further reduce the loss of energy density of the battery cell 1.

[0161] Please refer to Figures 8 to 13In some embodiments, the first protrusion 2121 has a first wall 2101 on at least one side along the second direction Y. The first wall 2101 is in clearance fit with the frame 10 along the second direction Y. The first wall 2101 has a first end 2011 and a second end 2012 opposite to each other along the first direction X. The first end 2011 is connected to the first main body portion 2111. The second protrusion 2122 has a second wall 2102 on at least one side along the second direction Y. The second wall 2102 is in clearance fit with the frame 10 along the second direction Y. The second wall 2102 has a third end 2013 and a fourth end 2014 opposite to each other along the first direction X. The third end 2013 is connected to the second main body portion 2112.

[0162] The first end 2011 is closer to the first main body 2111 than the second end 2012 and is connected to the first main body 2111. The third end 2013 is closer to the second main body 2112 than the fourth end 2014 and is connected to the second main body 2112.

[0163] like Figure 8 As shown, optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the first wall 2101 is a line segment parallel to the first direction X.

[0164] That is, the first wall 2101 can be set as a plane parallel to the first direction X. Optionally, the first protrusion 2121 has a first wall 2101 on both sides along the second direction Y, and in the same projection plane perpendicular to the thickness direction Z, at least one of the first walls 2101 has an orthographic projection as a line segment parallel to the first direction X.

[0165] like Figure 11 As shown, optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the first wall 2101 is a line segment intersecting the first direction X.

[0166] That is, the first wall 2101 can be set as a plane intersecting the first direction X. Optionally, the first protrusion 2121 has a first wall 2101 on both sides along the second direction Y, and in the same projection plane perpendicular to the thickness direction Z, at least one of the first walls 2101 has an orthographic projection as a line segment intersecting the first direction X.

[0167] like Figure 12 and Figure 13 As shown, optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the first wall 2101 is a curved structure.

[0168] In other words, the first wall 2101 can be configured as a curved structure. Optionally, in the same projection plane perpendicular to the thickness direction Z, the first protrusion 2121 has a first wall 2101 on both sides along the second direction Y, and at least one of the first walls 2101 has a curved structure in its orthographic projection.

[0169] Among them, the curved surface structure can be formed by an arc segment with the same curvature and around the same center, so as to reduce the processing difficulty and facilitate the processing and manufacturing.

[0170] like Figure 9 As shown, optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the second wall 2102 is a line segment parallel to the first direction X.

[0171] That is, the second wall 2102 can be set as a plane parallel to the first direction X. Optionally, the second protrusion 2122 has a second wall 2102 on both sides along the second direction Y, and in the same projection plane perpendicular to the thickness direction Z, at least one of the second walls 2102 has an orthographic projection as a line segment parallel to the first direction X.

[0172] Optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the second wall 2102 is a line segment intersecting the second direction Y.

[0173] That is, the second wall 2102 can be configured as a plane intersecting the first direction X. Optionally, the second protrusion 2122 has a second wall 2102 on both sides along the second direction Y, and in the same projection plane perpendicular to the thickness direction Z, at least one of the second walls 2102 has an orthographic projection as a line segment intersecting the second direction Y.

[0174] Optionally, in the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the second wall 2102 is a curved structure.

[0175] In other words, the second wall 2102 can be configured as a curved structure. Optionally, in the same projection plane perpendicular to the thickness direction Z, the second protrusion 2122 has a second wall 2102 on both sides along the second direction Y, and at least one of the second walls 2102 has a curved structure in its orthographic projection.

[0176] The shapes of the first wall 2101 and the second wall 2102 can be formed by any combination of the above two, which is beneficial to improving the flexibility of processing and manufacturing the battery cell 1.

[0177] To facilitate the processing and fabrication of the negative electrode 201 and the positive electrode 202, as an example, the first wall 2101 is parallel to the first direction X, and the second wall 2102 is parallel to the first direction X; or, both the first wall 2101 and the second wall 2102 are curved surfaces.

[0178] Please see Figures 5 to 7 In some embodiments, the frame 10 includes two supports 11 and two end plates 12. The two supports 11 are arranged opposite each other along a first direction X, and the two end plates 12 are arranged opposite each other along a second direction Y. The supports 11 are connected to the end plates 12.

[0179] By setting the frame 10 to be composed of two supports 11 and two end plates 12 connected in sequence, it is beneficial to reduce the manufacturing difficulty of the frame 10.

[0180] Optionally, at least one bracket 11 is provided with a through hole 102.

[0181] The bracket 11 is connected to the end plate 12 to form a ring structure. The two brackets 11 are fixed on both sides of the electrode assembly 20 along the first direction X, and the two end plates 12 are fixed on both sides of the electrode assembly 20 along the second direction Y.

[0182] To better reduce the possibility of interference between the support 11 and the negative electrode 201 and the positive electrode 202, the size of the support 11 may be larger than the size of the electrode assembly 20 in the thickness direction Z.

[0183] In some embodiments, the hardness of the bracket 11 is greater than the hardness of the end plate 12.

[0184] By setting it in the above manner, the strength loss of the bracket 11 caused by the through hole 102 can be reduced, which is conducive to improving the fixing and limiting effect of the bracket 11 on the electrode assembly 20.

[0185] Optionally, the bracket 11 and the end plate 12 can be made of the same material, and the thickness of the bracket 11 is greater than the thickness of the end plate 12, or the density of the bracket 11 is greater than the density of the end plate 12, so that the hardness of the bracket 11 can be greater than the hardness of the end plate 12.

[0186] Alternatively, the bracket 11 and the end plate 12 can be made of different materials. For example, the bracket 11 can be made of metal and the end plate 12 can be made of plastic.

[0187] Please see Figures 5 to 7 as well as Figure 15 In some embodiments, one of the end plate 12 and the bracket 11 is provided with a connection hole 121, and the other covers part of the connection hole 121. The end plate 12 and the bracket 11 are connected by a thermosetting member 40, and at least part of the connection hole 121 is provided with a thermosetting member 40.

[0188] By connecting the end plate 12 and the bracket 11 by heat fusion, the connection strength between the two can be improved. Furthermore, by setting the connection hole 121 to extend beyond the end plate 12 or the bracket 11, after the end plate 12 and the bracket 11 are connected by the heat fusion piece 40, the heat fusion piece 40 can fill the connection hole 121, thereby reducing the possibility of it accumulating between the end plate 12 and the bracket 11.

[0189] Optionally, the hot melt component 40 can be hot melt adhesive. After the end plate 12 and the bracket 11 are hot melt connected, the hot melt component 40 can be located in part of the connection hole 121 between them, and the hot melt component 40 can also overflow to other positions of the connection hole 121 to completely fill the connection hole 121.

[0190] Optionally, the end plate 12 is provided with a connecting hole 121 extending along the second direction Y, and the bracket 11 covers part of the connecting hole 121 along the second direction Y.

[0191] Optionally, the bracket 11 is provided with a connecting hole 121 extending along the first direction X, and the end plate 12 covers part of the connecting hole 121 along the first direction X.

[0192] Please see Figure 14 and Figure 15 In some embodiments, the end plate 12 is provided with a connection hole 121. Along the second direction Y, the connection hole 121 is spaced apart from the protrusion 212, and the orthographic projection of the connection hole 121 along the second direction Y is completely offset from the orthographic projection of the main body 211 along the second direction Y.

[0193] It should be noted that the connecting hole 121 is provided on the end plate 12. Therefore, the connecting hole 121 does not extend beyond the surface of the end plate 12. Thus, the connecting hole 121 can be spaced apart from the protrusion 212 and spaced apart from the main body 211.

[0194] By setting it in the above manner, the possibility of the hot melt 40 overflowing along the connection hole 121 and contacting the main body 211 or the protrusion 212 can be reduced, thereby helping to improve the service life of the battery cell 1.

[0195] In some other embodiments, the bracket 11 is provided with a connection hole 121, which is spaced apart from the protrusion 212 and spaced apart from the main body 211 along the first direction X.

[0196] like Figure 14 As shown, in some embodiments, along the first direction X, the protrusion 212 extends beyond the maximum size L of the main body 211, and the connecting hole 121 extends beyond the maximum size L3 of the bracket 11, wherein 0 < L3 ≤ L.

[0197] Wherein, the maximum dimension L of the protrusion 212 exceeding the main body 211 along the first direction X means that after the negative electrode 201 and the positive electrode 202 are stacked to form the electrode body 21, the total dimension of the first protrusion 2121 and the second protrusion 2122 stacked along the first direction X toward the side edge of the support 11 exceeds the maximum dimension of the total dimension of the first main body 2111 and the second main body 2112 stacked along the first direction X toward the side edge of the support 11.

[0198] By setting the value of L3 between 0 and L, including an endpoint value of L, it is possible to make the connecting hole 121 extend sufficiently beyond the size of the bracket 11, while ensuring that the connecting hole 121, the protrusion 212, and the main body 211 are all spaced apart. This allows the connecting hole 121 to provide more space for overflowing hot melt adhesive, which is beneficial to improving the reliability of the hot melt connection between the bracket 11 and the end plate 12.

[0199] To reduce the possibility of lithium plating in battery cell 1, along one side of the first direction X, the edge of the first protrusion 2121 opposite to the edge of the first main body 2111 extends beyond the edge of the second protrusion 2122 opposite to the edge of the second main body 2112, and / or, along one side of the first direction X, the edge of the first main body 2111 extends beyond the edge of the second main body 2112. And / or, along one side of the second direction Y, the edge of the first protrusion 2121 extends beyond the edge of the second protrusion 2122, and / or, along one side of the second direction Y, the edge of the first main body 2111 extends beyond the edge of the second main body 2112. In this structure, the maximum dimension L of the protrusion 212 extending beyond the main body 211 is equal to the maximum dimension L1 of the first protrusion 2121 in the first direction X.

[0200] Optionally, 0 < L3 ≤ L1.

[0201] Furthermore, in some embodiments, along one side of the first direction X, the connecting hole 121 extends beyond the maximum size L3 of the bracket 11, wherein 0 < L3 < 2 mm.

[0202] By further setting the value of L3 between 0 and 2 mm, including an endpoint value of 2 mm, it is possible to better ensure that the hot melt 40 overflowing from the connection hole 121 does not contact the main body 211 or the protrusion 212, thereby better improving the cycle life of the battery cell 1.

[0203] According to some embodiments of this application, this application also provides a battery device 100, including a plurality of battery cells 1 provided in any of the above embodiments.

[0204] According to some embodiments of this application, this application also provides an electrical device, including a plurality of battery devices 100 provided in any of the embodiments or a plurality of battery cells 1 provided in any of the embodiments, wherein the battery cells 1 or the battery devices 100 are used to store electrical energy or provide electrical energy.

[0205] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0206] Please refer to the following: Figures 4 to 15 According to some embodiments of this application, this application provides a battery cell 1 with a rectangular structure. The battery cell 1 includes a shell 30, a frame 10, and an electrode assembly 20 with a stacked structure. The frame 10 is disposed inside the shell 30 and together with the shell 30 forms a receiving space 101. The first direction X is the length direction of the electrode assembly 20, the battery cell 1, or the frame 10, and the second direction Y is the width direction of the electrode assembly 20, the battery cell 1, or the frame 10.

[0207] The frame 10 includes two supports 11 arranged opposite each other along the first direction X and two end plates 12 arranged opposite each other along the second direction Y. The supports 11 and the end plates 12 are connected to form a ring structure. Both supports 11 are provided with through holes 102. The hardness of the supports 11 is greater than that of the end plates 12.

[0208] The electrode assembly 20 includes an electrode body 21, a negative electrode tab 221, and a positive electrode tab 222. The electrode body 21 is disposed in the receiving space 101 and has a main body portion 211 and a protrusion portion 212. The electrode body 21 includes a negative electrode sheet 201 and a positive electrode sheet 202 stacked along its own thickness direction Z. The main body portion 211 includes a first main body portion 2111 constituting the negative electrode sheet 201 and a second main body portion 2112 constituting the positive electrode sheet 202. The protrusion portion 212 includes a first protrusion portion 2121 constituting the negative electrode sheet 201 and a second protrusion portion 2122 constituting the positive electrode sheet 202. The first protrusion portion 2121 and the second protrusion portion 2122 are arranged one-to-one along the thickness direction Z.

[0209] The first main body 2111 has a first protrusion 2121 connected to both sides along the first direction X. At least a portion of the first protrusion 2121 protrudes from both sides along the second direction Y. The second main body 2112 has a second protrusion 2122 connected to both sides along the first direction X. At least a portion of the second protrusion 2122 protrudes from both sides along the second direction Y. The negative electrode tab 221 and the positive electrode tab 222 are arranged opposite each other along the first direction X. The negative electrode tab 221 is connected to the first protrusion 2121 and is at least partially disposed within the through hole 102 of the adjacent bracket 11. The positive electrode tab 222 is connected to the second protrusion 2122 and is at least partially disposed within the through hole 102 of the adjacent bracket 11.

[0210] Along the first direction X, the edge of the first protrusion 2121 opposite to the first main body 2111 extends beyond the edge of the second protrusion 2122 opposite to the second main body 2112, and the edge of the first main body 2111 extends beyond the edge of the second main body 2112. Along the second direction Y, the edge of the first protrusion 2121 extends beyond the edge of the second protrusion 2122, and the edge of the first main body 2111 extends beyond the edge of the second main body 2112.

[0211] The maximum dimension of the first protrusion 2121 in the first direction X is L1. Along the second direction Y, the maximum dimension of the first main body portion 2111 extending beyond the first protrusion 2121 is H1. The maximum dimension of the second protrusion 2122 in the first direction X is L2. Along the second direction Y, the maximum dimension of the second main body portion 2112 extending beyond the second protrusion 2122 is H2. Where 2mm ≤ L1 ≤ 5mm, 0.3mm < H1 ≤ L1, 2mm ≤ L2 ≤ 5mm, and 0.3mm < H2 ≤ L2. Alternatively, along the first direction X, the maximum dimension of the negative electrode 201 extending beyond the positive electrode 202 is B. Where 2mm ≤ L1 ≤ 5mm, 0.3mm < H1 ≤ L1, L1 - B < L2 ≤ L1, 0.3mm < H2 ≤ L2, and 0.1mm ≤ B ≤ 5mm.

[0212] The first main body 2111 has a first wall 2101 on both sides along the second direction Y. The first wall 2101 is in clearance fit with the bracket 11 along the second direction Y. The first wall 2101 has a first end 2011 and a second end 2012 opposite along the first direction X. The first end 2011 is connected to the first main body 2111. The second main body 2112 has a second wall 2012 on both sides along the second direction Y. The second wall 2012 is in clearance fit with the bracket 11 along the second direction Y. The second wall 2102 has a third end 2013 and a fourth end 2014 opposite along the first direction X. The third end 2013 is connected to the second main body 2112. In the same projection plane perpendicular to the thickness direction Z, the orthographic projection of the first wall 2101 is a line segment parallel to the first direction X, and the orthographic projection of the second wall 2102 is also a line segment parallel to the first direction X. Alternatively, the orthographic projection of the first wall 2101 is a curved structure, and the orthographic projection of the second wall 2102 is also a curved structure.

[0213] The end plate 12 is provided with a connection hole 121. Along the first direction X and the second direction Y, the connection hole 121 is spaced apart from the first protrusion 2121 and the second protrusion 2122, and is also spaced apart from the first main body 2111 and the second main body 2112. The bracket 11 covers part of the connection hole 121 and is connected to the end plate 12 by a heat fusion piece 40. At least part of the connection hole 121 is provided with a heat fusion piece 40. Along the first direction X, the connection hole 121 exceeds the maximum size L3 of the bracket 11, where 0 < L3 ≤ 2 mm.

[0214] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0215] 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: shell; A frame is disposed within the outer shell, and the outer shell and the frame together enclose a receiving space; An electrode assembly includes an electrode body and a tab. The electrode body is connected to the tab on at least one side along a first direction. The electrode body is disposed in the receiving space and has a main body portion and a protrusion. The frame surrounds the periphery of the electrode assembly to fix the electrode assembly. The main body is connected to the protrusion on at least one side along the first direction, and the main body protrudes from at least a portion of the protrusion on at least one side along the second direction, such that the protrusion is in clearance fit with the frame on at least one side along the second direction, and the first direction intersects the second direction.

2. The battery cell according to claim 1, characterized in that, The frame has a through hole communicating with the receiving space, the receiving space and the through hole are arranged along the first direction, and at least a portion of the tabs are disposed in the through hole.

3. The battery cell according to claim 2, characterized in that, The electrode includes a negative electrode and a positive electrode; Both the negative electrode tab and the positive electrode tab are connected to the same side of the electrode body along the first direction; or, the negative electrode tab is connected to one side of the electrode body along the first direction, and the positive electrode tab is connected to the other side of the electrode body along the first direction. The frame has the through holes on both sides along the first direction, and at least a portion of the negative electrode tabs are disposed in one of the through holes, and at least a portion of the positive electrode tabs are disposed in the other through hole.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The main body is connected to the protrusions on both sides along the first direction, and / or the main body protrudes from at least a portion of the protrusions on both sides along the second direction.

5. The battery cell according to any one of claims 1 to 3, characterized in that, The electrode tab includes a negative electrode tab and a positive electrode tab. The electrode body includes a negative electrode sheet and a positive electrode sheet stacked along its own thickness direction. The main body includes a first main body portion constituting the negative electrode sheet and a second main body portion constituting the positive electrode sheet. The protrusion includes a first protrusion constituting the negative electrode sheet and a second protrusion constituting the positive electrode sheet. The first protrusion and the second protrusion are arranged in a one-to-one correspondence along the thickness direction. At least one of the first main body portion and the first protrusion is connected to the negative electrode tab. At least one of the second main body portion and the second protrusion is connected to the positive electrode tab. The first direction, the second direction, and the thickness direction intersect each other.

6. The battery cell according to claim 5, characterized in that, In the same projection plane perpendicular to the thickness direction, the orthographic projection of the first protrusion completely covers the orthographic projection of the second protrusion, and / or, the orthographic projection of the first main body completely covers the orthographic projection of the second main body.

7. The battery cell according to claim 5, characterized in that, The maximum dimension of the first protrusion in the first direction is L1, and the maximum dimension of the first main body portion extending beyond the first protrusion along one side of the second direction is H1, wherein 2mm≤L1≤10mm and 0.3mm<H1≤L1; The maximum dimension of the second protrusion in the first direction is L2, and the maximum dimension of the second main body portion exceeding the second protrusion on one side of the second direction is H2, wherein 2mm≤L2≤10mm and 0.3mm<H2≤L2, or L1-B<L2≤L1 and 0.3mm<H2≤L2 and 0.1mm≤B≤10mm, where B is the maximum dimension of the negative electrode sheet exceeding the positive electrode sheet on one side of the first direction.

8. The battery cell according to claim 7, characterized in that, 2mm≤L1≤5mm, and / or, 2mm≤L2≤5mm, and / or, 2mm≤B≤5mm.

9. The battery cell according to claim 5, characterized in that, The first protrusion has a first wall on at least one side along the second direction, the first wall being in clearance fit with the frame along the second direction, the first wall having a first end and a second end opposite to each other along the first direction, the first end being connected to the first main body portion; the second protrusion has a second wall on at least one side along the second direction, the second wall being in clearance fit with the frame along the second direction, the second wall having a third end and a fourth end opposite to each other along the first direction, the third end being connected to the second main body portion; In the same projection plane perpendicular to the thickness direction, the orthographic projection of the first wall is a line segment parallel to the first direction, or the orthographic projection of the first wall is a line segment intersecting the first direction, or the orthographic projection of the first wall is a curved structure. In the same projection plane perpendicular to the thickness direction, the orthographic projection of the second wall is a line segment parallel to the first direction, or the orthographic projection of the second wall is a line segment intersecting the first direction, or the orthographic projection of the second wall is a curved structure.

10. The battery cell according to any one of claims 1 to 3, characterized in that, The frame includes two supports and two end plates. The two supports are arranged opposite each other along the first direction, and the two end plates are arranged opposite each other along the second direction. The supports are connected to the end plates.

11. The battery cell according to claim 10, characterized in that, One of the end plate and the bracket is provided with a connection hole, and the other covers part of the connection hole. The end plate and the bracket are connected by a thermoplastic component, and the thermoplastic component is provided in at least part of the connection hole.

12. The battery cell according to claim 11, characterized in that, The end plate is provided with the connecting hole. Along the second direction, the connecting hole and the protrusion are spaced apart, and the orthographic projection of the connecting hole along the second direction is completely offset from the orthographic projection of the main body along the second direction.

13. The battery cell according to claim 12, characterized in that, Along one side of the first direction, the protrusion extends beyond the maximum dimension of the main body by L, and the connecting hole extends beyond the maximum dimension of the bracket by L3, wherein 0 < L3 ≤ L, 2 mm ≤ L ≤ 10 mm.

14. The battery cell according to claim 13, characterized in that, 0 < L3 ≤ 2 mm.

15. The battery cell according to claim 1 or 2, characterized in that, The electrode assembly has a stacked structure.

16. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 15.

17. An electrical appliance, characterized in that, It includes a plurality of battery devices as described in claim 16 or a plurality of battery cells as described in any one of claims 1 to 15, wherein the battery cells or the battery devices are used to store electrical energy or provide electrical energy.

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