Battery cell, battery, and electric device

Abstract

The application relates to a battery monomer, a battery and a power utilization device, which comprise: an electrode assembly, which comprises a first side surface, a second side surface and a connecting surface; the first side surface and the second side surface are oppositely arranged along a first direction, and the connecting surface is connected between the first side surface and the second side surface; and at least one set of fixing assemblies, which comprise a first fixing piece and a second fixing piece; one part of the first fixing piece is attached on the first side surface, and the other part is attached on the connecting surface; one part of the second fixing piece is attached on the second side surface, and the other part is attached on the connecting surface, and the first fixing piece and the second fixing piece partially overlap. The battery monomer, the battery and the power utilization device provided by the application have the advantages of better quality.

Description

Technical Field

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

[0002] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 battery applications, market demand is also constantly increasing.

[0003] Currently, the electrode components in battery cells are prone to compression damage during the casing process, resulting in poor quality of the battery cells. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery, and power supply device to address the issue of poor quality.

[0005] A first aspect of this application provides a battery cell, including: an electrode assembly including a first side, a second side, and a connecting surface; the first side and the second side are disposed opposite to each other along a first direction, and the connecting surface is connected between the first side and the second side; and at least one set of fixing components, including a first fixing member and a second fixing member; a portion of the first fixing member is attached to the first side and another portion is attached to the connecting surface; a portion of the second fixing member is attached to the second side and another portion is attached to the connecting surface, and the first fixing member and the second fixing member partially overlap.

[0006] By setting a first fixing member and a second fixing member, one part of the first fixing member is attached to the first side and the other part is attached to the connecting surface. This ensures that the first side bends towards the second side under the action direction of the first fixing member, thus preventing the first side from turning outward. One part of the second fixing member is attached to the second side and the other part is attached to the connecting surface. This ensures that the second side bends towards the first side under the action direction of the second fixing member, thus preventing the second side from turning outward. The first and second fixing members partially overlap, allowing them to be connected as a whole. This enables the electrode assembly to be fixed and positioned, and ensures that the electrode assembly is not easily misaligned by external forces during transportation, resulting in good alignment of the electrode assembly and thus ensuring the quality of the battery cell.

[0007] In one embodiment, the first fixing member includes an integrally connected first segment and a second segment, and the second fixing member includes an integrally connected third segment and a fourth segment; the first segment is attached to the first side surface, and the second segment is attached to the connecting surface; the third segment is attached to the second side surface, and the fourth segment is attached to the connecting surface; the second segment and the fourth segment at least partially overlap. This allows for the limiting and fixing of the electrode assembly along a first direction, ensuring that the electrode assembly is not easily displaced by external forces during transport, resulting in good alignment of the electrode assembly and thus ensuring the quality of the battery cell.

[0008] In one embodiment, the length of the overlapping portion of the second segment and the fourth segment along the first direction is E1, where 0 mm < E1 ≤ 32 mm. By limiting the length of the overlapping portion of the second segment and the fourth segment along the first direction, it can be effectively ensured that the overlapping area of ​​the first fixing member and the second fixing member on the connection surface forms an effective connection to provide sufficient structural strength. This allows for the limiting and fixing of the electrode assembly along the first direction and ensures that the electrode assembly is not easily displaced by external forces during transportation, resulting in good alignment of the electrode assembly and thus ensuring the quality of the battery cell.

[0009] In one embodiment, the length of the connecting surface along the first direction is B2; the length of the second segment along the first direction is A2, satisfying 0.2*B2≤A2≤B2; and the length of the fourth segment along the first direction is a2, satisfying 0.2*B2≤a2≤B2. This ensures that the bonding area of ​​the second and fourth segments on the connecting surface is sufficiently large, providing a stable anchoring force, effectively transmitting the bending torque, strengthening the bending effect on the first / second side, and preventing outward flipping.

[0010] In one embodiment, the lengths of the first side and the second side along the second direction are both B1; the length of the first segment along the second direction is A1, satisfying 0.2*B1≤A1≤0.35*B1; the length of the third segment along the second direction is a1, satisfying 0.2*B1≤a1≤0.35*B1; the first direction and the second direction are intersecting.

[0011] In one embodiment, the lengths of the first side and the second side along the third direction are both B3; the length of the first segment along the third direction is A3, satisfying 0.1*B3≤A3≤0.2*B3; the length of the third segment along the third direction is a3, satisfying 0.1*B3≤a3≤0.2*B3; the first direction, the second direction, and the third direction are arranged to intersect each other.

[0012] In one embodiment, the battery cell includes at least two sets of the fixing components; the at least two sets of the fixing components are arranged at intervals along the third direction; the shortest distance between the edge of the electrode assembly along the third direction and the outermost fixing component is D1, where 0mm≤D1<30mm.

[0013] In one embodiment, the first fastener is blue adhesive tape; and / or, the second fastener is blue adhesive tape; and / or, the first fastener is L-shaped; and / or, the second fastener is L-shaped; and / or, the fastening assembly is C-shaped.

[0014] In one embodiment, the electrode assembly includes multiple cathode plates and multiple anode plates; all the cathode plates and anode plates are alternately stacked along the first direction; along the first direction, the first anode plate located at the top of the electrode assembly forms the first side surface; the last anode plate located at the bottom of the electrode assembly forms the second side surface. Thus, the two outermost anode plates serve as the first side surface and the second side surface, respectively; they are glued and fixed by a first fixing member and a second fixing member, effectively preventing them from turning outwards and ensuring that the electrode assembly is not easily misaligned by external forces during transportation, resulting in good alignment of the electrode assembly and thus ensuring the quality of the battery cell.

[0015] In one embodiment, projected along the first direction, the anode sheet covers the cathode sheet; a portion of the first fixing member is attached to the first anode sheet, and the other portion is attached to the connecting surface, thereby causing the portion of the first anode sheet protruding from the cathode sheet to bend towards the last anode sheet; a portion of the second fixing member is attached to the last anode sheet, and the other portion is attached to the connecting surface, thereby causing the portion of the last anode sheet protruding from the cathode sheet to bend towards the first anode sheet. This ensures that the portion of the first anode sheet protruding from the cathode sheet bends downwards under the action of the first fixing member, and the last anode sheet bends upwards under the action of the second fixing member, thus preventing the first anode sheet from flipping upwards outwards and the last anode sheet from flipping downwards outwards.

[0016] A second aspect of this application provides a battery comprising the aforementioned battery cell.

[0017] A third aspect of this application provides an electrical device including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy; or, the electrical device includes the aforementioned battery, wherein the battery is used to provide electrical energy.

[0018] 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

[0019] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0020] Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0022] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0023] Figure 5 The diagram shows the structure of the electrode assembly and fixing assembly provided in some embodiments of this application.

[0024] Figure 6 This is a schematic diagram illustrating the interaction between the electrode assembly and the fixing assembly provided in some embodiments of this application.

[0025] Figure 7 The diagram shows the structure of the electrode assembly and fixing assembly provided in other embodiments of this application.

[0026] Figure 8 This is a schematic diagram of the structure of a fixing component provided in some embodiments of this application.

[0027] Figure 9 This is a schematic diagram illustrating the engagement of the electrode assembly and the fixing assembly provided in some embodiments of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] Vehicles -1000;

[0030] Battery-100, Housing-110, First Part-111, Second Part-112, Battery Module-120, Battery Cell-121, End Cap-122, Housing-123, Electrode Assembly-124, Electrode Terminal-125, First Side-124a, Second Side-124b, Connecting Surface-124c, Cathode Electrode-126, Anode Electrode-127, Controller-200, Motor-300;

[0031] Fixing component-400, first fixing member-410, first section-411, second section-412, second fixing member-420, third section-421, fourth section-422. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, if the technical terms such as "first" and "second" appear, these terms are used only for descriptive purposes to distinguish different objects, and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0035] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of the embodiments of this application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise explicitly specified. Similarly, if the term "multiple sets" appears, "multiple sets" refers to two or more sets (including two sets), and if the term "multiple pieces" appears, "multiple pieces" refers to two or more pieces (including two pieces).

[0038] In the description of the embodiments of this application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 battery applications, market demand is also constantly increasing.

[0043] In related technologies, if the electrode assembly is not shaped after being Z-stacked, it is prone to compression damage during the casing process. To prevent loosening, blue adhesive is often used to fix the electrode assembly. However, during the fixation process, the blue adhesive is often pasted from one large surface of the electrode assembly to the other large surface, which can cause the outermost anode plate to flip outward. If the blue adhesive is not pasted, the electrode assembly cannot be fixed. During the transportation process, the electrode assembly is prone to interlayer misalignment due to external forces, which leads to a deterioration in alignment and consequently poor quality of the battery cell.

[0044] Based on the above considerations, in order to solve the problem of poor battery cell quality, a fixing component was designed to constrain the electrode assembly. The fixing component includes two mutually bonded fasteners. One part of the fastener is bonded to the large surface of the electrode assembly, and the other part is bonded to the connecting surface of the electrode assembly. This ensures that the electrode plates located on both sides of the electrode assembly can bend inward under the action of the fastener, thereby preventing them from turning outward. This allows for the limiting and fixing of the electrode assembly, and ensures that the electrode assembly is not easily displaced by external forces during transportation, resulting in good alignment of the electrode assembly and thus ensuring the quality of the battery cell.

[0045] This application provides a battery cell, a battery, and an electrical device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, energy storage product, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Energy storage products can include energy storage stations, etc.

[0046] It should be understood that the technical solutions described in the embodiments of this application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including housings and electrical devices using batteries. However, for the sake of brevity, an embodiment of this application using a vehicle 1000 as an example will be used for illustration.

[0047] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments 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. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0048] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0049] Figure 2 Exploded views of battery 100 provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application. Please refer to... Figure 2 and Figure 3 To meet different power demands, the battery 100 may include multiple battery cells 121 and a housing 110. A battery cell 121 refers to the smallest unit that makes up the battery module 120 or battery pack. Multiple battery cells 121 may be connected in series and / or in parallel via electrode terminals for various applications.

[0050] The housing 110 is used to house the battery cell 121 or battery module 120 to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 121.

[0051] The housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first part 111 and a second part 112, which overlap each other, and together define a receiving space for accommodating the battery cell 121. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure, with the first part 111 covering the open side of the second part 112 so that the first part 111 and the second part 112 together define the receiving space; the first part 111 and the second part 112 may also be hollow structures with one side open, with the open side of the first part 111 covering the open side of the second part 112. Of course, the housing 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The embodiments of this application are not limited in this respect. The material of the housing 110 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. The embodiments of this application are not limited to this.

[0052] In the embodiments of this application, multiple battery cells 121 can be directly assembled into a battery pack, or they can first be assembled into a battery module 120, and then the battery modules 120 can be assembled into a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, in parallel, or in a mixed manner to form a whole, and then the whole composed of multiple battery cells 121 can be housed in a housing 110. Alternatively, multiple battery cells 121 can first be connected in series, in parallel, or in a mixed manner to form a battery module 120, and then multiple battery modules 120 can be connected in series, in parallel, or in a mixed manner to form a whole, and housed in a housing 110.

[0053] The battery 100 may also include other structures, for example, the battery 100 may also include a busbar for realizing electrical connection between multiple battery cells 121.

[0054] In this embodiment, each battery cell 121 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 121 can be cylindrical, flat, cuboid, or other shapes. Battery cells 121 are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells. This embodiment is not limited to these types. However, for the sake of brevity, the following embodiments will use a cuboid / square lithium-ion battery cell 121 as an example for description.

[0055] The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124, and other functional components.

[0056] End cap 122 refers to a component that covers the opening of housing 123 to isolate the internal environment of electrode assembly 124 from the external environment. The shape of end cap 122 can be adapted to the shape of housing 123 to fit it. Optionally, end cap 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 122 is less prone to deformation under pressure and impact, allowing the battery cell 121 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 125 can be provided on end cap 122. Electrode terminals 125 can be used for electrical connection with electrode assembly 124 to output or input electrical energy to battery cell 121. In some embodiments, end cap 122 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 121 reaches a threshold. The material of end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 122. The insulating element can be used to isolate the electrical connection components within the housing 123 from the end cap 122 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0057] The housing 123 is an assembly used to cooperate with the end cap 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can accommodate the electrode assembly 124, electrolyte, and other components. The housing 123 and the end cap 122 can be independent components. An opening can be provided on the housing 123, and the end cap 122 closes the opening to form the internal environment of the battery cell 121. Alternatively, the end cap 122 and the housing 123 can be integrated. Specifically, the end cap 122 and the housing 123 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 123, the end cap 122 closes the housing 123. The housing 123 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 123 can be determined according to the specific shape and size of the electrode assembly 124. The shell 123 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0058] The housing 123 may contain one or more electrode assemblies 124.

[0059] Please refer to Figures 4 to 9 As shown, Figure 4 This is an exploded structural diagram of a battery cell 121 provided in some embodiments of this application. Figure 5 The diagram shows the structure of the electrode assembly and fixing assembly provided in some embodiments of this application. Figure 6 This is a schematic diagram illustrating the interaction between the electrode assembly and the fixing assembly provided in some embodiments of this application. Figure 7 The diagram shows the structure of the electrode assembly and fixing assembly provided in other embodiments of this application. Figure 8 This is a schematic diagram of the structure of a fixing component provided in some embodiments of this application. Figure 9 This is a schematic diagram illustrating the engagement of the electrode assembly and the fixing assembly provided in some embodiments of this application.

[0060] A first aspect of this application provides a battery cell 121, which includes an electrode assembly 124 and at least one set of fixing components 400.

[0061] The electrode assembly 124 includes a first side surface 124a, a second side surface 124b, and a connecting surface 124c; the first side surface 124a and the second side surface 124b are arranged opposite to each other along a first direction X, and the connecting surface 124c is connected between the first side surface 124a and the second side surface 124b.

[0062] Each set of fixing components 400 includes a first fixing member 410 and a second fixing member 420. A portion of the first fixing member 410 is attached to a first side surface 124a, and another portion is attached to a connecting surface 124c. A portion of the second fixing member 420 is attached to a second side surface 124b, and another portion is attached to the connecting surface 124c. The first fixing member 410 and the second fixing member 420 partially overlap.

[0063] Electrode assembly 124 is the component in the battery cell 121 where electrochemical reactions occur. Electrode assembly 124 is mainly formed by winding or stacking cathode electrode 126 and anode electrode 127, and a separator (not shown) is typically provided between the cathode electrode 126 and anode electrode 127. The portions of the cathode electrode 126 and anode electrode 127 containing active material constitute the main body of electrode assembly 124, while the portions of the cathode electrode 126 and anode electrode 127 without active material each constitute electrode tabs (not shown). Positive and negative electrode tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the electrode tabs connect to external electrode terminals 125 (mentioned below) to form a current loop.

[0064] In this embodiment, the main body of the electrode assembly 124 includes a first side surface 124a, a second side surface 124b, and a connecting surface 124c. The first side surface 124a and the second side surface 124b are arranged opposite to each other along a first direction X, and the first side surface 124a and the second side surface 124b respectively correspond to the large surface of the battery cell 121, that is, both are the two sides with the largest area in the electrode assembly 124; the connecting surface 124c connects the first side surface 124a and the second side surface 124b; the first direction X can be the thickness direction of the battery cell 121.

[0065] By setting a fixing component 400, which includes a first fixing member 410 and a second fixing member 420, when the first fixing member 410 is pasted, one part of the first fixing member 410 is pasted on the first side 124a and the other part is pasted on the connecting surface 124c. This ensures that the first side 124a bends towards the side of the second side 124b under the action direction of the first fixing member 410, thereby preventing the first side 124a from turning outward.

[0066] When the second fastener 420 is attached, one part of the second fastener 420 is attached to the second side 124b and the other part is attached to the connecting surface 124c. This ensures that the second side 124b bends toward the first side 124a in the direction of action of the second fastener 420, thereby preventing the second side 124b from turning outward.

[0067] The first fixing member 410 and the second fixing member 420 are partially overlapped, so that the first fixing member 410 and the second fixing member 420 can be connected into a whole, thereby limiting and fixing the electrode assembly 124 and ensuring that the electrode assembly 124 is not easily displaced by external forces during transportation, so that the alignment of the electrode assembly 124 is good, thereby ensuring the quality of the battery cell 121.

[0068] It should be noted that, in some embodiments of this application, for ease of explanation, a first direction X, a second direction Y, and a third direction Z are defined. The directions of the first direction X, the second direction Y, and the third direction Z are intersecting each other. Here, intersecting each other includes intersecting each other perpendicularly.

[0069] To facilitate understanding of the embodiments of this application, in Figures 4 to 9In the illustrated embodiment, the example given is that the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. In a specific embodiment, the first direction X can be a direction perpendicular to the large surface, that is, the thickness direction of the battery cell 121; the second direction Y can be a direction parallel to the large surface, that is, the width direction of the battery cell 121; and the third direction can be the length direction of the battery cell 121.

[0070] In some possible embodiments, see Figures 4 to 9 As shown, the first fastener 410 includes a first section 411 and a second section 412 integrally connected, and the second fastener 420 includes a third section 421 and a fourth section 422 integrally connected.

[0071] The first section 411 is pasted on the first side surface 124a, the second section 412 is pasted on the connecting surface 124c; the third section 421 is pasted on the second side surface 124b, and the fourth section 422 is pasted on the connecting surface 124c; the second section 412 and the fourth section 422 at least partially overlap.

[0072] Specifically, the first section 411 of the first fastener 410 is attached to the first side 124a, and the second section 412 of the first fastener 410 is attached to the connecting surface 124c. When attaching the first fastener 410, the first section 411 of the first fastener 410 is first attached to the first side 124a, and then the second section 412 of the first fastener 410 is pressed towards the side of the second side 124b until the second section 412 is attached to the upper half of the connecting surface 124c. In this way, it can be ensured that the first side 124a bends towards the side of the second side 124b under the action direction of the first fastener 410, thereby avoiding the first side 124a from turning outward.

[0073] The third section 421 of the second fastener 420 is attached to the second side 124b, and the fourth section 422 of the second fastener 420 is attached to the connecting surface 124c. When attaching the second fastener 420, first attach the third section 421 of the second fastener 420 to the second side 124b, and then press the fourth section 422 of the second fastener 420 toward the first side 124a until the fourth section 422 is attached to the lower half of the connecting surface 124c. In this way, it can be ensured that the first side 124a bends toward the second side 124b in the direction of action of the first fastener 410, thereby avoiding the first side 124a from turning outward.

[0074] The second section 412 of the first fixing member 410 partially overlaps with the fourth section 422 of the second fixing member 420, so that the first fixing member 410 and the second fixing member 420 can be connected as a whole, thereby limiting and fixing the electrode assembly 124 along the first direction X, and ensuring that the electrode assembly 124 is not easily displaced by external forces during transportation, so that the alignment of the electrode assembly 124 is good, thereby ensuring the quality of the battery cell 121.

[0075] In some possible embodiments, see Figures 4 to 9 As shown, the length of the overlapping portion of the second segment 412 and the fourth segment 422 along the first direction is E1, where 0mm < E1 ≤ 32mm.

[0076] By limiting the length E1 of the overlapping portion of the second segment 412 and the fourth segment 422 along the first direction, it can be effectively ensured that the overlapping area of ​​the first fixing member 410 and the second fixing member 420 on the connecting surface 124c forms an effective connection to provide sufficient structural strength. This allows for the limiting and fixing of the electrode assembly 124 along the first direction X, and ensures that the electrode assembly 124 is not easily displaced by external forces during transportation, resulting in good alignment of the electrode assembly 124 and thus ensuring the quality of the battery cell 121. At the same time, it can also avoid the problem of excessively thick adhesive layer due to excessively large overlapping area of ​​the second segment 412 and the fourth segment 422, which would affect the heat dissipation capacity of the battery.

[0077] In some possible embodiments, see Figures 4 to 9 As shown, the length of the connecting surface 124c along the first direction is B2, which satisfies 0 < E1 ≤ B2.

[0078] By limiting the length E1 of the overlapping portion of the second segment 412 and the fourth segment 422 along the first direction to be less than or equal to the length B2 of the connecting surface 124c along the first direction, it is ensured that the overlapping portion of the second segment 412 and the fourth segment 422 is always within the effective range of the connecting surface 124c (i.e., it will not extend beyond the connecting surface 124c), thus avoiding adhesion failure or interference with the integrity of other structures of the electrode assembly 124 due to the overlapping portion extending beyond the edge of the connecting surface 124c.

[0079] More specifically, the length E1 of the overlapping portion of the second segment 412 and the fourth segment 422 along the first direction is greater than 0.1 times the length B2 of the connecting surface 124c along the first direction, satisfying 0.1*B2≤E1≤B2. Thus, by limiting the length E1 of the overlapping portion of the second segment 412 and the fourth segment 422 along the first direction, it is ensured that the overlapping area of ​​the first fixing member 410 and the second fixing member 420 on the connecting surface 124c forms an effective connection to provide sufficient structural strength, thereby enabling the electrode assembly 124 to be fixed and positioned along the first direction X.

[0080] In some possible embodiments, see Figures 4 to 9 As shown, the length of the second segment 412 of the first fastener 410 along the first direction X is A2, which satisfies 0.2*B2≤A2≤B2; the length of the fourth segment 422 of the second fastener 420 along the first direction X is a2, which satisfies 0.2*B2≤a2≤B2.

[0081] By limiting the length A2 of the second segment 412 along the first direction X and the length a2 of the fourth segment 422 of the second fastener 420 along the first direction X, and ensuring that 0.2*B2≤A2 and 0.2*B2≤a2, the bonding area of ​​the second segment 412 and the fourth segment 422 on the connecting surface 124c is large enough to provide a stable anchoring force, effectively transmit the bending torque, strengthen the bending effect on the first side 124a / second side 124b, and prevent outward flipping.

[0082] Furthermore, by setting A2≤B2 and a2≤B2, the second segment 412 and the fourth segment 422 are prevented from excessively covering the connecting surface 124c, reserving space for the pasting and overlapping operations of the second segment 412 and the fourth segment 422 on the connecting surface 124c, ensuring that the first fastener 410 and the second fastener 420 are bonded and overlapped on the limited connecting surface 124c, ultimately ensuring their ability to fix the electrode assembly 124.

[0083] In some possible embodiments, see Figures 4 to 9 As shown, the lengths of the first side 124a and the second side 124b along the second direction Y are both B1; the length of the first segment 411 along the second direction Y is A1, satisfying 0.2*B1≤A1≤0.35*B1; the length of the third segment 421 along the second direction Y is a1, satisfying 0.2*B1≤a1≤0.35*B1; the first direction X and the second direction Y are intersected.

[0084] In this embodiment, by limiting the length A1 of the first segment 411 along the second direction Y and the length a1 of the third segment 421 of the second fastener 420 along the second direction Y, the following conditions are met: 0.2*B1≤A1≤0.35*B1 and 0.2*B1≤a1≤0.35*B1. This ensures that the first segment 411 on the first side 124a and the third segment 421 on the second side 124b can form adhesive strips of sufficient width, providing stable anti-peel strength, effectively transmitting torque during pressing operations, thereby providing sufficient constraint and limitation on the electrode assembly 124 and further suppressing the risk of electrode flipping.

[0085] In some embodiments, the length A1 of the first segment 411 along the second direction Y is less than or equal to 50 mm, for example, 10 mm, 20 mm, 25 mm, 30 mm, 40 mm, 45 mm or 50 mm; thereby providing sufficient adhesive strength.

[0086] In some embodiments, the length A1 of the third segment 421 along the second direction Y is less than or equal to 50 mm, for example, 10 mm, 20 mm, 25 mm, 30 mm, 40 mm, 45 mm or 50 mm; thereby providing sufficient adhesive strength.

[0087] In some possible embodiments, see Figures 4 to 9 As shown, the lengths of the first side 124a and the second side 124b along the third direction Z are both B3; the length of the first segment 411 along the third direction Z is A3, satisfying 0.1*B3≤A3≤0.2*B3; the length of the third segment 421 along the third direction Z is a3, satisfying 0.1*B3≤a3≤0.2*B3. The first direction X, the second direction Y, and the third direction Z are intersected pairwise.

[0088] In this embodiment, by limiting the length A3 of the first segment 411 of the first fastener 410 along the third direction Z and the length a3 of the third segment 421 of the second fastener 420 along the third direction Z, the conditions 0.1*B3≤A3≤0.2*B3 and 0.1*B3≤a3≤0.2*B3 are met. Combined with the bending constraint in the second direction Y, it is ensured that the first segment 411 on the first side 124a and the third segment 421 on the second side 124b can form a sufficiently large adhesive band, and the necessary minimum adhesive height is formed in the third direction Z and the second direction Y, providing shear strength, effectively preventing interlayer micro-misalignment, thereby providing sufficient constraint and limiting for the electrode assembly 124 and further suppressing the risk of electrode flipping outward, effectively reducing the risk of displacement between electrodes, and significantly improving the fault tolerance rate during the transfer and housing process of the electrode assembly.

[0089] In some embodiments, the length A3 of the first segment 411 along the third direction Z is less than or equal to 30 mm, for example, 5 mm, 10 mm, 20 mm, 25 mm or 30 mm; thereby providing sufficient adhesive strength.

[0090] The length a3 of the third segment 421 along the third direction Z is less than or equal to 30 mm, for example, 5 mm, 10 mm, 20 mm, 25 mm or 30 mm; thereby providing sufficient adhesive strength.

[0091] In some possible embodiments, see Figures 4 to 9 As shown, the battery cell 121 includes at least two sets of fixing components 400; the at least two sets of fixing components 400 are arranged at intervals along the third direction Z.

[0092] Thus, multiple sets of fixing components 400 that serve as constraints are formed on the same connecting surface 124c along the third direction Z, which can accommodate electrode components 124 of different sizes. This allows for the limiting and fixing of the electrode components 124 along the first direction X, and ensures that the electrode components 124 are not easily displaced by external forces during transportation, resulting in good alignment of the electrode components 124 and thus ensuring the quality of the battery cell 121.

[0093] Specifically, the shortest distance between the edge of the electrode assembly 124 along the third direction Z and the outermost fixing assembly 400 is D1, where 0mm ≤ D1 < 30mm.

[0094] By limiting the shortest distance D1 between the fixing component 400 and the electrode assembly 124 along the third direction Z, sufficient space is ensured for the fixing component 400, and interference with other structures of the electrode assembly 124 is avoided.

[0095] In some possible embodiments, see Figures 4 to 9 As shown, the first fastener 410 is L-shaped; the second fastener 420 is L-shaped; and the fastening assembly 400 is C-shaped.

[0096] By defining the first fixing member 410 as L-shaped and the second fixing member 420 as L-shaped, the L-shaped fixing members can be formed by integrally molded sections, forming the first section 411 and the second section 412, the third section 421 and the fourth section 422, and finally forming a C-shaped fixing assembly 400, providing multi-directional constraints, effectively preventing the electrode assembly 124 from loosening, and enhancing the constraint on the outermost electrode of the electrode assembly 124 from turning outward.

[0097] In some possible embodiments, see Figures 4 to 9 As shown, the first fastener 410 is blue adhesive tape; the second fastener 420 is blue adhesive tape.

[0098] The first fixing member 410 and the second fixing member 420 are made of blue adhesive tape, which has the advantages of high adhesion, insulation and flexibility. They can limit and fix the electrode assembly 124 and ensure that the electrode assembly 124 is not easily displaced by external forces during transportation. This ensures that the alignment of the electrode assembly 124 is good and does not damage the electrode sheet, thereby ensuring the quality of the battery cell 121.

[0099] In some embodiments, see Figures 4 to 9As shown, both the first side surface 124a and the second side surface 124b are rectangular large surfaces, corresponding to the large surfaces of the battery cell 121. The first side surface 124a and the second side surface 124b have four edges. Correspondingly, the main body of the electrode assembly 124 includes four connecting surfaces 124c connecting the first side surface 124a and the second side surface 124b. Of the four connecting surfaces 124c, two are arranged opposite each other along the second direction Y, and the other two are arranged opposite each other along the third direction Z. The fixing component 400 can be arranged on any one or more connecting surfaces 124c to fix the electrode assembly 214; the specific design is subject to the specific requirements, and this embodiment does not limit this.

[0100] Specifically, see Figures 4 to 9 As shown, the electrode assembly 124 includes two connecting surfaces 124c arranged opposite each other along the second direction Y. Multiple fixing components 400 are symmetrically arranged on the two connecting surfaces 124c. This symmetrical arrangement causes the constraint forces on the electrode assembly 124 in the second direction Y to cancel each other out, eliminating the asymmetric stress accumulation caused by the unilateral attachment of the fixing components 400. This effectively ensures that the electrode assembly 124 is not easily displaced by external forces during transport, resulting in good alignment of the electrode assembly 124 without damaging the electrode sheets, thereby ensuring the quality of the battery cell 121.

[0101] It is understandable that multiple fixed components 400 can also be symmetrically arranged on two connecting surfaces 124c that are opposite each other along the third direction Z. Their function and purpose are similar to the structure described above, and will not be repeated here.

[0102] In some embodiments, the electrode assembly 124 may be wound.

[0103] In some other possible embodiments, see Figures 4 to 9 As shown, the electrode assembly 124 can be in a Z-stack configuration. Specifically, the electrode assembly 124 includes multiple cathode electrodes 126 and multiple anode electrodes 127. All cathode electrodes 126 and anode electrodes 127 are stacked alternately along a first direction X. Along the first direction X, the first anode electrode 127 located at the top of the electrode assembly 124 is formed as a first side surface 124a; the last anode electrode 127 located at the bottom of the electrode assembly 124 is formed as a second side surface 124b.

[0104] Thus, the two outermost anode plates 127 serve as the first side 124a and the second side 124b, respectively. They are glued and fixed by the first fixing member 410 and the second fixing member 420, which effectively prevents them from turning outward and ensures that the electrode assembly 124 is not easily displaced by external forces during transportation, so that the alignment of the electrode assembly 124 is good, thereby ensuring the quality of the battery cell 121.

[0105] In this embodiment, the anode plate 127 covers the cathode plate 126 when projected along the first direction X; one part of the first fixing member 410 is pasted on the first anode plate 127, and the other part is pasted on the connecting surface 124c, so that the part of the first anode plate 127 protruding from the cathode plate 126 bends towards the last anode plate 127.

[0106] Specifically, see Figure 9 As shown, when attaching the first fixing member 410, firstly attach the first section 411 of the first fixing member 410 to the first anode electrode 127, and then press the second section 412 of the first fixing member 410 toward one side of the last anode electrode 127 until the second section 412 is attached to the upper half of the connecting surface 124c; in this way, it can be ensured that the part of the first anode electrode 127 protruding from the cathode electrode 126 bends downward under the action of the first fixing member 410, thereby avoiding the first anode electrode 127 from flipping upward outward.

[0107] One part of the second fastener 420 is attached to the last anode plate 127, and the other part is attached to the connecting surface 124c, so that the part of the last anode plate 127 that protrudes from the cathode plate 126 bends toward the first anode plate 127.

[0108] Specifically, see Figure 9 As shown, when attaching the second fastener 420, first attach the third section 421 of the second fastener 420 to the last anode plate 127, and then press the fourth section 422 of the second fastener 420 toward one side of the first anode plate 127 until the fourth section 422 is attached to the lower half of the connecting surface 124c. In this way, it can be ensured that the last anode plate 127 bends upward under the action of the second fastener 420, thereby avoiding the last anode plate 127 from turning downward outward.

[0109] A second aspect of this application provides a battery 100, including the battery cell 121 described above.

[0110] A third aspect of this application provides an electrical device 1000, which includes the aforementioned battery cell 121, and the battery cell 121 is used to provide electrical energy to the electrical device 1000. Alternatively, the electrical device 1000 includes the aforementioned battery 100, and the battery 100 is used to provide electrical energy to the electrical device 1000.

[0111] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The electrode assembly (124) includes a first side surface (124a), a second side surface (124b), and a connecting surface (124c); the first side surface (124a) and the second side surface (124b) are disposed opposite to each other along a first direction (X), and the connecting surface (124c) is connected between the first side surface (124a) and the second side surface (124b); And at least one set of fixing components (400), including a first fixing member (410) and a second fixing member (420); a portion of the first fixing member (410) is attached to the first side surface (124a) and another portion is attached to the connecting surface (124c); One part of the second fastener (420) is attached to the second side surface (124b), and the other part is attached to the connecting surface (124c), and the first fastener (410) partially overlaps with the second fastener (420).

2. The battery cell according to claim 1, characterized in that, The first fastener (410) includes a first section (411) and a second section (412) integrally connected, and the second fastener (420) includes a third section (421) and a fourth section (422) integrally connected. The first section (411) is pasted on the first side surface (124a), and the second section (412) is pasted on the connecting surface (124c); The third section (421) is pasted on the second side (124b), and the fourth section (422) is pasted on the connecting surface (124c); The second segment (412) overlaps at least partially with the fourth segment (422).

3. The battery cell according to claim 2, characterized in that, The length of the overlapping portion of the second segment (412) and the fourth segment (422) along the first direction is E1, where 0mm < E1 ≤ 32mm.

4. The battery cell according to claim 3, characterized in that, The length of the connecting surface (124c) along the first direction is B2; The length of the second segment (412) along the first direction (X) is A2, which satisfies 0.2*B2≤A2≤B2; The length of the fourth segment (422) along the first direction (X) is a2, which satisfies 0.2*B2≤a2≤B2.

5. The battery cell according to claim 2, characterized in that, The length of the first side surface (124a) and the second side surface (124b) along the second direction (Y) is B1; The length of the first segment (411) along the second direction (Y) is A1, which satisfies 0.2*B1≤A1≤0.35*B1; The length of the third segment (421) along the second direction (Y) is a1, which satisfies 0.2*B1≤a1≤0.35*B1; The first direction (X) and the second direction (Y) are intersected.

6. The battery cell according to claim 5, characterized in that, The lengths of the first side (124a) and the second side (124b) along the third direction (Z) are both B3; The length of the first segment (411) along the third direction (Z) is A3, satisfying 0.1*B3≤A3≤0.2*B3; The length of the third segment (421) along the third direction (Z) is a3, satisfying 0.1*B3≤a3≤0.2*B3; The first direction (X), the second direction (Y), and the third direction (Z) are arranged to intersect each other.

7. The battery cell according to claim 6, characterized in that, The battery cell includes at least two sets of the fixing components (400); the at least two sets of the fixing components (400) are arranged at intervals along the third direction (Z); The shortest distance between the electrode assembly (124) and the outermost fixing assembly (400) along the third direction (Z) is D1, where 0mm ≤ D1 < 30mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The first fastener (410) is blue adhesive tape; and / or, The second fastener (420) is blue adhesive tape; and / or, The first fastener (410) is L-shaped; and / or, The second fastener (420) is L-shaped; and / or, The fixing component (400) is C-shaped.

9. The battery cell according to any one of claims 1 to 7, characterized in that, The electrode assembly (124) includes multiple cathode plates (126) and multiple anode plates (127). All of the cathode plates (126) and the anode plates (127) are stacked alternately along the first direction (X); Along the first direction (X), the first anode plate (127) located at the top of the electrode assembly (124) is formed as the first side surface (124a); the last anode plate (127) located at the bottom of the electrode assembly (124) is formed as the second side surface (124b).

10. The battery cell according to claim 9, characterized in that, Projected along the first direction (X), the anode plate (127) covers the cathode plate (126). One part of the first fastener (410) is attached to the first anode plate (127), and the other part is attached to the connecting surface (124c), so that the part of the first anode plate (127) protruding from the cathode plate (126) bends toward the last anode plate (127); One part of the second fastener (420) is attached to the last anode sheet (127), and the other part is attached to the connecting surface (124c), so that the part of the last anode sheet (127) protruding from the cathode sheet (126) bends toward the first anode sheet (127).

11. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, The electrical device includes a battery cell as described in any one of claims 1 to 10, the battery cell being used to provide electrical energy; or, the electrical device includes a battery as described in claim 11, the battery being used to provide electrical energy.

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