Battery cell, battery device, and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises an end cover; the shell comprises an opening in one end and a first wall opposite to the opening; the end cover covers the opening of the shell to form an accommodating cavity; the side, facing the opening, of the first wall comprises a first area and a second area surrounding the first area. The first area protrudes towards the opening relative to the second area; the electrode assembly is arranged in the accommodating cavity; and at least one part of the electrode assembly is in contact with the first region, so that a gap is formed between the electrode assembly and the second region. According to the battery monomer, the battery device and the power utilization device provided by the embodiment of the invention, interference in assembly of the shell and the electrode assembly can be effectively prevented.

Description

Technical Field

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

[0002] 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.

[0003] During battery manufacturing, interference can easily occur when assembling the battery cell casing with the internal electrode components, resulting in poor battery performance. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, a battery device, and an electrical device to address the problem of assembly interference.

[0005] A first aspect of this application provides a battery cell, comprising: an end cap; a housing including an opening at one end and a first wall disposed opposite to the opening; the end cap covering the opening of the housing to form a receiving cavity; the first wall including a first region and a second region surrounding the first region on the side facing the opening; the first region protruding toward the opening relative to the second region; and an electrode assembly disposed in the receiving cavity; at least a portion of the electrode assembly contacting the first region to form a gap between the electrode assembly and the second region.

[0006] By constructing the first wall of the housing to include a first region protruding toward the opening and a second region surrounding the first region, the first region being a platform protruding toward the interior of the receiving cavity, at least a portion of the electrode assembly housed within the receiving cavity can directly contact and be supported by the protruding first region. In this way, the remaining portion of the electrode assembly, especially the edge region of the bottom side of the electrode assembly facing the first wall, can be spaced apart from the second region of the first wall, effectively avoiding direct interference and continuous mechanical compression between the right-angled edges or sides of the electrode assembly and the first wall of the housing. This reduces electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thereby improving the cycle performance and safety of the battery cell and resulting in better performance of the battery device.

[0007] In one embodiment, the first wall includes an arcuate surface structure, and the first region and the second region are transitionally connected through the arcuate surface structure. By setting the transition portion between the first region and the second region on the first wall as a smooth arcuate surface structure, sharp edges or right-angle steps that may exist at the edge of the boss in the first region can be effectively eliminated. In the boundary region where the bottom side of the electrode assembly contacts the first region, stress concentration points caused by local shape abrupt changes can be effectively avoided, thereby reducing the risk of electrode coating damage or current collector micro-deformation due to excessive local pressure at the support boundary of the electrode assembly.

[0008] In one embodiment, the orthographic projection of the first region onto the first wall is a square, rectangle, circle, or ellipse.

[0009] In one embodiment, the distance between the edge of the first region and the edge of the first wall is L1, 3mm≤L1≤20mm; and / or, the height difference between the first region and the second region is L2, 0.2mm≤L2≤5mm.

[0010] In one embodiment, the housing includes a plurality of side plates; all of the side plates are sequentially arranged around the first wall and form the opening at an end away from the first wall; at least one of the side plates includes a raised region and a clearance region surrounding the raised region; the raised region protrudes into the receiving cavity relative to the clearance region; at least a portion of the electrode assembly contacts the raised region such that a gap is formed between the electrode assembly and the clearance region.

[0011] In one embodiment, the housing includes two first side plates disposed opposite each other along a first direction and two second side plates disposed opposite each other along a second direction; the area of ​​the first side plates is larger than that of the second side plates and the first wall; the first wall and the opening are disposed opposite each other along a third direction; one of the first side plates, one of the second side plates, another of the first side plates, and another of the second side plates are sequentially arranged around the first wall; the first direction, the second direction, and the third direction intersect each other and are not coplanar.

[0012] In one embodiment, the first side plate includes a third region and a fourth region surrounding the third region; the third region protrudes into the housing cavity relative to the fourth region; the first side of the electrode assembly along the first direction contacts the third region, such that a gap is formed between the first side of the electrode assembly and the fourth region. By specifically constructing the first side plate, which has the largest area, as including a third region protruding into the housing cavity and a fourth region surrounding the third region, the third region being a platform protruding into the housing cavity, the first side of the electrode assembly along the first direction can directly abut against and be supported by the protruding third region, while the edge portion of the first side remains spaced from the non-protruding fourth region on the first side plate; this effectively avoids direct interference and continuous mechanical compression between the largest surface edge of the electrode assembly, which is mainly affected by expansion force, and the first side plate of the housing, thereby mitigating electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thus improving the cycle performance and safety of the battery cell and resulting in better performance of the battery device.

[0013] In one embodiment, the distance between the edge of the third region and the edge of the first side plate is L3, 3mm≤L3≤20mm; and / or, the height difference between the third region and the fourth region is L4, 0.2mm≤L4≤5mm.

[0014] In one embodiment, the second side plate includes a fifth region and a sixth region surrounding the fifth region; the fifth region protrudes into the housing cavity relative to the sixth region; the second side of the electrode assembly along the second direction contacts the fifth region, such that the second side of the electrode assembly and the sixth region are spaced apart. By specifically constructing the second side plate to include a fifth region protruding into the housing cavity and a sixth region surrounding the fifth region, the fifth region being a platform protruding into the housing cavity, the second side of the electrode assembly along the second direction can directly abut against and be supported by the protruding fifth region, while the edge portion of the second side remains spaced from the non-protruding sixth region on the second side plate; this effectively avoids direct interference and continuous mechanical compression between the edge of the second side connecting the two large surfaces of the electrode assembly and the second side plate of the housing, thereby mitigating electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thus improving the cycle performance and safety of the battery cell and resulting in better battery device performance.

[0015] In one embodiment, the distance between the edge of the fifth region and the edge of the second side plate is L5, 3mm≤L5≤20mm; and / or, the height difference between the fifth region and the sixth region is L6, 0.2mm≤L6≤5mm.

[0016] In one embodiment, one of the first side plates includes a plate body and a cover plate; a notch is formed on the plate body, and the cover plate covers the notch. By designing one of the first side plates as a split structure consisting of a plate body and a separable cover plate, the operator can use the plate body as a tray for placing electrode components, and the cover plate is closed onto the notch of the plate body in a flip-top manner and fixed by welding, thereby greatly simplifying the assembly of battery cells, avoiding scratches and displacement caused by forcibly inserting electrode components from the opening of the casing, and thus reducing damage to the electrode components.

[0017] In one embodiment, the battery cell further includes two electrode terminals disposed on the end cap, the two electrode terminals being respectively connected to the electrode assembly; the bottom side of the electrode assembly, located away from the electrode terminals in a third direction, contacts the first region, thereby forming a gap between the bottom side and the second region.

[0018] A second aspect of this application provides a battery device including the aforementioned battery cell.

[0019] A third aspect of the embodiments of this application provides an electrical device including the battery cell described above, wherein the battery cell is used to provide electrical energy; or, the electrical device includes the battery described above, wherein the battery is used to provide electrical energy.

[0020] 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

[0021] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0022] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0023] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0024] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0025] Figure 5 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application.

[0026] Figure 6This is a schematic diagram of the structure of the first wall provided for some embodiments of this application.

[0027] Figure 7 A front view of the first wall provided for some embodiments of this application.

[0028] Figure 8 for Figure 7 The provided AA section view of the first wall.

[0029] Figure 9 This is a schematic diagram of the internal structure of a battery cell provided in some other embodiments of this application.

[0030] Figure 10 The diagram shows the structure of the housing provided for some embodiments of this application.

[0031] Figure 11 The diagram below shows the structure of the housing provided in some other embodiments of this application, wherein the direction indicated by the solid arrow is the assembly direction of the cover plate and the plate body.

[0032] Figure 12 This is a schematic diagram of the structure of the first side plate provided in some embodiments of this application.

[0033] Figure 13 A front view of a first side panel provided for some embodiments of this application.

[0034] Figure 14 This is a schematic diagram of the structure of the second side plate provided in some embodiments of this application.

[0035] Figure 15 A front view of a second side panel provided for some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] Vehicle-1000, Battery Unit-100, Housing-110, First Part-111, Second Part-112, Battery Module-120, Battery Cell-121, End Cap-122, Housing-123, First Side Plate-1231, Second Side Plate-1232, Cover Plate-1233, Plate Body-1234, First Wall-1235, Opening-1236, Receiving Cavity-1237, Notch-1238, Electrode Assembly-124, First Side-1241, Second Side-1242, Bottom Side-1243, Electrode Terminal-125, Controller-200, Motor-300; First Region-410, Second Region-420, Third Region-430, Fourth Region-440, Fifth Region-450, Sixth Region-460, First Direction-X, Second Direction-Y, Third Direction-Z. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In related technologies, the corners of the electrode assembly are prone to contact and continuous compression with the inner wall of the battery cell casing. This localized mechanical stress can damage the edge structure of the electrode assembly, easily inducing lithium plating during long-term use, thereby impairing the cycle performance and safety of the battery cell. To alleviate this problem, some technical solutions involve machining rounded chamfers on the edges of the inner wall of the casing to avoid interference. However, this design cannot solve the corner compression caused by the weight of the electrode assembly contacting the casing. In other technical solutions, the edges of the electrode assembly are raised by increasing the overall wall thickness of the casing. However, this design increases the overall weight of the battery, reduces heat dissipation performance, and may cause cell position shifts during production due to the increased casing thickness, resulting in new uneven stress.

[0050] To mitigate the interference between the casing and the electrode assembly, a raised first region and a second region surrounding the first region can be designed into the first wall. This allows at least a portion of the electrode assembly to directly contact and be supported by the raised first region. The remaining portion of the electrode assembly can be spaced apart from the second region of the first wall, effectively preventing direct interference and continuous mechanical compression between the right-angled edges or sides of the electrode assembly and the first wall of the casing. This reduces electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thereby improving the cycle performance and safety of the battery cell and resulting in better battery device performance.

[0051] This application provides a battery cell, a battery device, and an electrical device. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, energy storage products, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Energy storage products can include energy storage stations, etc.

[0052] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, an embodiment of this application is used as an example of an electrical device, namely a vehicle 1000.

[0053] Please refer to Figure 1 , Figure 1 This 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 device 100 is provided inside the vehicle 1000, and 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. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0054] In some embodiments 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 for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] Figure 2 Exploded views of the battery device 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 device 100 may include multiple battery cells 121 and a housing 110. A battery cell 121 is 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.

[0056] 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.

[0057] 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.

[0058] 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, parallel, or mixed 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, parallel, or mixed to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel, or mixed to form a whole, and housed in a housing 110.

[0059] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 121.

[0060] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. Figure 5 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application. Figure 6 This is a schematic diagram of the structure of the first wall provided for some embodiments of this application. Figure 7 A front view of the first wall provided for some embodiments of this application. Figure 8 for Figure 7 The provided AA section view of the first wall. Figure 9 This is a schematic diagram of the internal structure of a battery cell provided in some other embodiments of this application. Figure 10The diagram shows the structure of the housing provided for some embodiments of this application. Figure 11 The diagram below shows the structure of the housing provided in some other embodiments of this application, wherein the direction indicated by the solid arrow is the assembly direction of the cover plate and the plate body. Figure 12 This is a schematic diagram of the structure of the first side plate provided in some embodiments of this application. Figure 13 A front view of a first side panel provided for some embodiments of this application. Figure 14 This is a schematic diagram of the structure of the second side plate provided in some embodiments of this application. Figure 15 A front view of a second side panel provided for some embodiments of this application.

[0061] The first aspect of this application provides a battery cell 121.

[0062] Please see Figures 4 to 15 As shown, the battery cell 121 includes: an end cap 122, a housing 123, and an electrode assembly 124.

[0063] The housing 123 includes an opening 1236 at one end and a first wall 1235 disposed opposite to the opening; the end cap 122 covers the opening 1236 of the housing 123 to form a receiving cavity 1237; the side of the first wall 1235 facing the opening 1236 includes a first region 410 and a second region 420 surrounding the first region 410.

[0064] The first region 410 protrudes from the opening 1236 relative to the second region 420. The electrode assembly 124 is disposed within the receiving cavity 1237.

[0065] At least a portion of the electrode assembly 124 is in contact with the first region 410 such that a gap is formed between the electrode assembly 124 and the second region 420.

[0066] In this embodiment, end cap 122 refers to a component that covers the opening 1236 of housing 123 to isolate the internal environment of electrode assembly 124 from the external environment. Not limited to this, the shape of end cap 122 can be adapted to the shape of housing 123 to fit the housing 123. 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, enabling 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 may 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 end cap 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 122. The insulating member can be used to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0067] The housing 123 is used to cooperate with the end cap 122 to form a receiving cavity 1237 for the battery cell 121. The receiving cavity 1237 can accommodate the electrode assembly 124, electrolyte, and other components. The housing 123 and the end cap 122 can be independent components. An opening 1236 can be provided on the housing 123, and the end cap 122 can close the opening at the opening 1236 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, or hexagonal prism. 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.

[0068] Electrode assembly 124 is the component in the battery cell 121 where electrochemical reactions occur. The housing 123 may contain one or more electrode assemblies 124. Electrode assembly 124 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 124, while the portions of the positive and negative electrode sheets without active material each constitute a tab (not shown). The positive and negative 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 device, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 125 to form a current loop.

[0069] By constructing the first wall 1235 of the housing 123 to include a first region 410 protruding toward the opening 1236 and a second region 420 surrounding the first region 410, the first region 410 being a platform protruding toward the interior of the receiving cavity 1237, at least a portion of the electrode assembly 124 housed in the receiving cavity 1237 can directly contact and be supported by the protruding first region 410. In this way, the remaining portion of the electrode assembly 124, especially the edge region of the bottom side surface 1243 (mentioned below) of the electrode assembly 124 facing the first wall 1235, can form a gap with the second region 420 of the first wall 1235, effectively avoiding direct interference and continuous mechanical compression between the right-angled edge or side of the electrode assembly 124 and the first wall 1235 of the housing 123. This reduces electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thereby improving the cycle performance and safety of the battery cell 121 and making the battery device 100 perform better.

[0070] Furthermore, the opening 1236 and the first wall 1235 are located at the two ends of the housing 123 along the third direction Z, respectively; the first region 410 provides fixed-point contact support to the electrode assembly 124, and together with the constraint of the end cap 122, it can effectively maintain the relatively centered and stable position of the electrode assembly 124 in the housing 123, prevent it from shifting during manufacturing, transportation or use, and ensure the uniformity and consistency of the interface state of the battery device 100 during long-term cycling, thereby significantly improving the cycle life and safety reliability of the battery device 100.

[0071] Optionally, the housing 123 can be a 3-series aluminum housing. In order to ensure the interface quality in the long term, the rigidity of the aluminum housing cannot be too strong. When the electrode assembly 124 expands, it can expand the aluminum housing without excessive compression causing lithium deposition in the electrode assembly 124. When it contracts, the aluminum housing can have a certain degree of rebound. Therefore, the side plate in this application is made of 3-series aluminum housing with sufficient strength and ductility.

[0072] It should be noted that in the various embodiments of this application, each battery cell 121 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device, or a magnesium-ion battery device, but is not limited to these. The battery cell 121 can be cylindrical, flat, cuboid, or other shapes. Battery cells 121 are generally divided into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0073] In some possible embodiments, see Figures 1 to 15 As shown, the first wall 1235 includes an arcuate surface structure (not shown), and the first region 410 and the second region 420 are connected by the arcuate surface structure.

[0074] In this embodiment, by setting the transition between the first region 410 and the second region 420 on the first wall 1235 as a smooth arc surface structure, the sharp edges or right-angle steps that may exist on the edge of the boss of the first region 410 can be effectively eliminated. In the boundary area where the bottom side surface 1243 of the electrode assembly 124 contacts the first region 410, stress concentration points caused by local shape changes can be effectively avoided, thereby reducing the risk of electrode coating damage or current collector micro-deformation of the electrode assembly 124 at the support boundary due to excessive local pressure.

[0075] It should be noted that the transition between the first region 410 and the second region 420 is set as a smooth arc surface, which can reduce internal stress, optimize force transmission, and thus improve the structural durability of the housing 123 when it is subjected to the expansion force of the electrode assembly 124.

[0076] Moreover, the smooth arc transition helps to guide the electrode assembly 124 into the casing more smoothly and place it accurately on the first region 410 during the battery manufacturing process, reducing the risk of scratches during assembly and improving the stability and reliability of the battery cell 121.

[0077] Optionally, the angle D1 between the transition region between the first region 410 and the second region 420 and the plane where the second region 420 is located should be no less than 160°. This allows for an extremely smooth transition at the edge of the first region 410, thereby minimizing local stress concentration points and resulting in a more uniform distribution of the supporting force on the electrode assembly 124. This effectively prevents micro-damage to the electrode sheets of the electrode assembly 124 at the support boundary and improves its structural durability and reliability during long-term cycling.

[0078] In some possible embodiments, see Figures 1 to 15 As shown, the orthographic projection of the first region 410 onto the first wall 1235 is a square, a rectangle, a circle, or an ellipse.

[0079] Thus, by projecting the first region 410 onto the first wall 1235 as a square, rectangle, circle, or ellipse, a clear planar outline can be provided for the protruding first region 410, thereby achieving a good match with the bottom shape of the common square or cylindrical electrode assembly 124 and realizing a uniform distribution of support force.

[0080] In some other embodiments, the orthographic projection of the first region 410 onto the first wall 1235 may also be an irregular shape, and this application embodiment does not limit this.

[0081] In some possible embodiments, see Figures 1 to 15 As shown, the distance between the edge of the first region 410 and the edge of the first wall 1235 is L1, where 3mm≤L1≤20mm.

[0082] By limiting the distance L1 between the edge of the first region 410 and the edge of the first wall 1235 to a range of 3 mm to 20 mm, it can be ensured that there is a sufficient and reliable safety gap between the edge of the bottom side surface 1243 of the electrode assembly 124 and the side wall of the housing 123. In this way, the edge of the electrode assembly 124 can still be prevented from contacting and being squeezed by the housing when the position of the electrode assembly 124 is shifted due to manufacturing tolerances, thermal expansion or charging and discharging.

[0083] Using the aforementioned distance range can also prevent the electrode assembly 124 from shaking or the local pressure from being too high due to the first region 410 being too small because L1 is too large, thus optimizing the stress situation of the electrode assembly 124.

[0084] In some possible embodiments, the distance L1 between the edge of the first region 410 and the edge of the first wall 1235 is limited to 5 mm to 20 mm.

[0085] In some possible embodiments, see Figures 1 to 15 As shown, the height difference between the first region 410 and the second region 420 is L2, where 0.2mm≤L2≤5mm.

[0086] By limiting the height difference L2 between the first region 410 and the second region 420 to a range of 0.2mm to 5mm, it is ensured that the protrusion of the first region 410 can provide sufficient height to reliably separate the bottom side 1243 edge of the electrode assembly 124 from the second region 420, thus completely avoiding contact interference. It also prevents the protrusion from being too high due to an excessively large L2. On the one hand, it effectively prevents problems such as unstable support of the electrode assembly 124, insufficient local structural strength of the housing 123, or difficulties in the molding process. On the other hand, it can also take into account the energy density of the battery.

[0087] In some possible embodiments, the height difference L2 between the first region 410 and the second region 420 is limited to the range of 0.5 mm to 5 mm.

[0088] In some possible embodiments, the housing 123 includes a plurality of side plates. All the side plates are arranged sequentially around the first wall 1235 and form an opening 1236 at the end away from the first wall 1235.

[0089] At least one of the side plates includes a raised region and a clearance region surrounding the raised region; the raised region is disposed protruding into the receiving cavity 1237 relative to the clearance region. At least a portion of the electrode assembly 124 contacts the raised region, thereby forming a gap between the electrode assembly 124 and the clearance region.

[0090] In this embodiment, all side plates are sequentially arranged around the first wall 1235 to form a shell 123; along the third direction Z, an opening 1236 is formed at the end away from the first wall 1235.

[0091] The housing 123 includes multiple side panels, which may be two, three, four, five or more side panels, depending on the design.

[0092] At least one side plate includes a raised area and a clearance area surrounding the raised area. This means that a raised area can be provided on only one side plate to solve the interference problem caused by forces on that side plate; alternatively, raised areas can be provided on both opposite side plates to symmetrically clamp and suspend the battery cell from both sides, which is more effective. Raised areas can also be provided on all side plates, thereby isolating the edge of the electrode assembly 124 from the housing 123 in all directions to prevent interference.

[0093] By providing at least one side plate including a raised area and a clearance area surrounding the raised area; the raised area protrudes into the receiving cavity 1237 relative to the clearance area; the raised area on the side plate and the first area 410 of the first wall 1235 can abut against and provide support to the corresponding side of the electrode assembly 124 from multiple directions, so that not only the bottom side 1243 edge of the electrode assembly 124, but also its side edge can maintain a distance from the clearance area of ​​the corresponding side plate, thereby completely eliminating the possibility of rigid contact interference between the electrode assembly 124 and the inner wall of the housing in any direction, thus greatly mitigating the risk of electrode damage and lithium plating caused by edge contact, collision or extrusion of the electrode assembly 124; thereby improving the cycle performance and safety of the battery cell 121, making the battery device 100 perform better.

[0094] It should be emphasized that the raised areas in the corresponding directions of the multiple side plates can achieve multi-directional positioning and clamping, which can effectively maintain the relatively centered and stable position of the electrode assembly 124 in the housing 123, prevent it from shifting during manufacturing, transportation or use, and ensure the uniformity and consistency of the interface state of the battery device 100 during long-term cycling, thereby significantly improving the cycle life and safety reliability of the battery device 100.

[0095] In some possible embodiments, see Figures 1 to 15 As shown, the battery cell 121 is a cuboid or square battery cell 121.

[0096] The housing 123 includes two first side plates 1231 arranged opposite each other along a first direction X, and two second side plates 1232 arranged opposite each other along a second direction Y; the area of ​​the first side plates 1231 is larger than that of the second side plates 1232 and the first wall 1235. The first wall 1235 and the opening 1236 are arranged opposite each other along a third direction Z.

[0097] One first side plate 1231, one second side plate 1232, another first side plate 1231, and another second side plate 1232 are arranged sequentially around the first wall 1235.

[0098] The first direction X, the second direction Y, and the third direction Z are set to intersect each other, and the three are not coplanar.

[0099] 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 first direction X, the second direction Y, and the third direction Z are intersecting each other and are not coplanar. Here, intersecting each other includes intersecting each other perpendicularly.

[0100] To facilitate understanding of the embodiments of this application, in Figures 1 to 15 In the illustrated embodiment, the example is given where 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 of the battery cell 121 (the large surface is also the plane where the first side plate 1231 is located), the second direction Y can be a direction parallel to the large surface, and the third direction Z can be the height direction of the battery cell 121.

[0101] In this embodiment, the housing 123 is surrounded by two first side plates 1231 and two second side plates 1232 with the largest area around the first wall 1235, and together they form a semi-closed structure with an opening 1236 at one end.

[0102] In some possible embodiments, see Figures 1 to 15As shown, the first side plate 1231 includes a third region 430 and a fourth region 440 surrounding the third region 430; the third region 430 protrudes into the receiving cavity 1237 relative to the fourth region 440. The first side surface 1241 of the electrode assembly 124 along the first direction X contacts the third region 430, such that a gap is formed between the first side surface 1241 of the electrode assembly 124 and the fourth region 440.

[0103] By specifically constructing the first side plate 1231, which has the largest area, as including a third region 430 protruding into the cavity 1237 and a fourth region 440 surrounding the third region 430, the third region 430 is a platform protruding into the cavity 1237. The first side surface 1241 of the electrode assembly 124 along the first direction X can directly contact and be supported by the protruding third region 430, while the edge of the first side surface 1241 is spaced apart from the non-protruding fourth region 440 on the first side plate 1231. This effectively avoids direct interference and continuous mechanical compression between the largest surface edge of the electrode assembly 124, which is mainly affected by expansion force, and the first side plate 1231 of the housing 123. This reduces the risk of electrode damage, electrode delamination, and corner lithium plating caused by such compression, thereby improving the cycle performance and safety of the battery cell 121 and making the battery device 100 perform better.

[0104] The third region 430 and the fourth region 440 can cooperate with the first region 410 and the second region 420 of the first wall 1235 to achieve dual suspension and cooperative positioning of the electrode assembly 124 at the upper edge of the first direction X and the third direction Z. This can effectively maintain the relative centering and stable position of the electrode assembly 124 within the housing 123, prevent it from shifting during manufacturing, transportation or use, and ensure the uniformity and consistency of the interface state of the battery device 100 during long-term cycling, thereby significantly improving the cycle life and safety reliability of the battery device 100.

[0105] Optionally, similar to the first region 410 and the second region 420, the third region 430 and the fourth region 440 adopt a smooth transition with an arc surface, which will not be described in detail in this application.

[0106] Optionally, the angle D2 between the transition region between the third region 430 and the fourth region 440 and the plane where the fourth region 440 is located should be no less than 160°. This allows for an extremely smooth transition at the edge of the third region 430, thereby minimizing local stress concentration points and resulting in a more uniform distribution of the supporting force on the electrode assembly 124. This effectively prevents micro-damage to the electrode sheets of the electrode assembly 124 at the support boundary and improves its structural durability and reliability during long-term cycling.

[0107] Optionally, similar to the first region 410 and the first wall 1235, the orthographic projection of the third region 430 onto the first side plate 1231 is a square, rectangle, circle, ellipse or irregular shape, which will not be elaborated further in this application.

[0108] In some possible embodiments, see Figures 1 to 15 As shown, the distance between the edge of the third region 430 and the edge of the first side plate 1231 is L3, 3mm≤L3≤20mm.

[0109] By limiting the distance L3 between the edge of the third region 430 and the edge of the first side plate 1231 to a range of 3 mm to 20 mm, it can be ensured that there is a sufficient and reliable safety gap between the edge of the first side 1241 of the electrode assembly 124 and the first side plate 1231 of the housing 123. In this way, the edge of the electrode assembly 124 can still be prevented from contacting and being squeezed by the housing when the position of the electrode assembly 124 is shifted due to manufacturing tolerances, thermal expansion or charging and discharging.

[0110] In some possible embodiments, the distance L3 between the edge of the third region 430 and the edge of the first side plate 1231 is limited to 5 mm to 20 mm.

[0111] In some possible embodiments, see Figures 1 to 15 As shown, the height difference between the third region 430 and the fourth region 440 is L4, where 0.2mm≤L4≤5mm.

[0112] By limiting the height difference L4 between the third region 430 and the fourth region 440 to a range of 0.2mm to 5mm, it is ensured that the protrusion of the third region 430 can provide sufficient height to reliably separate the edge of the first side 1241 of the electrode assembly 124 from the fourth region 440, thus completely avoiding contact interference. At the same time, it prevents the protrusion from being too high due to an excessively large L4. This effectively prevents problems such as unstable support of the electrode assembly 124, insufficient local structural strength of the housing 123, or difficulties in the molding process. On the other hand, it can also take into account the energy density of the battery.

[0113] In some possible embodiments, the height difference L4 between the third region 430 and the fourth region 440 is limited to the range of 0.5 mm to 5 mm.

[0114] In some possible embodiments, see Figures 1 to 15 As shown, the second side plate 1232 includes a fifth region 450 and a sixth region 460 surrounding the fifth region 450; the fifth region 450 is provided to protrude into the receiving cavity 1237 relative to the sixth region 460.

[0115] The second side 1242 of the electrode assembly 124 along the second direction Y contacts the fifth region 450, such that the second side 1242 of the electrode assembly 124 and the sixth region 460 are spaced apart.

[0116] By specifically constructing the second side plate 1232 to include a fifth region 450 protruding into the cavity 1237 and a sixth region 460 surrounding the fifth region 450, the fifth region 450 being a platform protruding into the cavity 1237, the second side surface 1242 of the electrode assembly 124 along the second direction Y can directly contact and be supported by the protruding fifth region 450, while the edge portion of the second side surface 1242 is spaced apart from the non-protruding sixth region 460 on the second side plate 1232; this effectively avoids direct interference and continuous mechanical compression between the edge of the second side surface 1242 connecting the two large surfaces of the electrode assembly 124 and the second side plate 1232 of the housing 123, thereby mitigating electrode damage, electrode delamination, and the resulting risk of corner lithium plating caused by such compression, thereby improving the cycle performance and safety of the battery cell 121, and making the battery device 100 perform better.

[0117] The fifth region 450 and the sixth region 460 on the second side plate 1232 can cooperate with the third region 430 and the fourth region 440 on the first side plate 1231, as well as the first region 410 and the second region 420 on the first wall 1235, to achieve three-dimensional suspension and cooperative positioning of the electrode assembly 124 at its upper edges in the first direction X, the second direction Y, and the third direction Z. This can effectively maintain the relative centering and stable position of the electrode assembly 124 within the housing 123, preventing it from shifting during manufacturing, transportation, or use. This ensures the uniformity and consistency of the interface state of the battery device 100 during long-term cycling, thereby significantly improving the cycle life and safety reliability of the battery device 100.

[0118] Optionally, similar to the first region 410 and the second region 420, the fifth region 450 and the sixth region 460 adopt a smooth transition with an arc surface, which will not be described in detail in this application.

[0119] Optionally, the angle D3 between the transition region between the fifth region 450 and the sixth region 460 and the plane where the sixth region 460 is located should be no less than 160°. This allows for an extremely smooth transition at the edge of the fifth region 450, thereby minimizing local stress concentration points and resulting in a more uniform distribution of the supporting force on the electrode assembly 124. This effectively prevents micro-damage to the electrode sheets of the electrode assembly 124 at the support boundary and improves its structural durability and reliability during long-term cycling.

[0120] Optionally, similar to the first region 410 and the first wall 1235, the orthographic projection of the fifth region 450 onto the second side plate 1232 is a square, rectangle, circle, ellipse or irregular shape, which will not be elaborated further in this application.

[0121] In some possible embodiments, see Figures 1 to 15 As shown, the distance between the edge of the fifth region 450 and the edge of the second side plate 1232 is L5, 3mm≤L5≤20mm.

[0122] By limiting the distance L5 between the edge of the fifth region 450 and the edge of the second side plate 1232 to a range of 3 mm to 20 mm, it can be ensured that there is a sufficient and reliable safety gap between the edge of the second side 1242 of the electrode assembly 124 and the second side plate 1232 of the housing 123. In this way, the edge of the electrode assembly 124 can still be prevented from contacting and being squeezed by the housing when the position of the electrode assembly 124 is shifted due to manufacturing tolerances, thermal expansion or charging and discharging.

[0123] In some possible embodiments, the distance L5 between the edge of the fifth region 450 and the edge of the second side plate 1232 is limited to the range of 5 mm to 20 mm.

[0124] In some possible embodiments, see Figures 1 to 15 As shown, the height difference between the fifth region 450 and the sixth region 460 is L6, where 0.2mm≤L6≤5mm.

[0125] By limiting the height difference L6 between the fifth region 450 and the sixth region 460 to a range of 0.2mm to 5mm, it is ensured that the protrusion of the fifth region 450 can provide sufficient height to reliably separate the edge of the second side 1242 of the electrode assembly 124 from the sixth region 460, thus completely avoiding contact interference. At the same time, it prevents the protrusion from being too high due to an excessively large L6. This effectively prevents problems such as unstable support of the electrode assembly 124, insufficient local structural strength of the housing 123, or difficulties in the molding process. On the other hand, it can also take into account the energy density of the battery.

[0126] In some possible embodiments, the height difference L6 between the fifth region 450 and the sixth region 460 is limited to the range of 0.5 mm to 5 mm.

[0127] In some possible embodiments, see Figures 1 to 4 ,as well as Figures 6 to 15 As shown, one of the first side panels 1231 includes a panel body 1234 and a cover plate 1233; a notch 1238 is formed on the panel body 1234, and the cover plate 1233 covers the notch 1238.

[0128] In this embodiment, one of the first side plates 1231 is designed as a split structure consisting of a plate body 1234 and a separable cover plate 1233. A notch 1238 is formed on the plate body 1234 and sealed by the cover plate 1233, thereby facilitating the manufacturing and processing of the first side plate 1231. The notch 1238 on the plate body 1234 is typically square, providing feasibility for setting the material thickness individually or performing independent processing. This optimizes manufacturability and assembly quality while ensuring the long-term reliability of the battery device 100.

[0129] In this embodiment, the independent cover plate 1233 can be precisely formed into a first region 410 with a specific contour and size through processes such as stamping. The remaining non-protruding parts on the cover plate 1233 together with the plate body 1234 constitute the second region 420, ensuring the geometric accuracy of the first side 1241 of the electrode assembly 124 and the second region 420, and effectively preventing interference.

[0130] In this embodiment, by designing one of the first side plates 1231 as a split structure consisting of a plate body 1234 and a separable cover plate 1233, the operator can use the plate body 1234 as a tray for placing the electrode assembly 124, and the cover plate 1233 is closed on the notch 1238 of the plate body 1234 in the form of a flip cover and fixed by welding, thereby greatly simplifying the assembly of the battery cell 121, avoiding the scratching and displacement caused by forcibly inserting the electrode assembly 124 from the opening 1236 of the housing 123, and thus reducing the damage to the electrode assembly 124.

[0131] Optionally, the cover plate 1233 has beveled edges, and the edge of the notch 1238 has an installation bevel that matches the bevel of the cover plate 1233. This makes the positioning of the cover plate 1233 and the plate body 1234 better and the welding connection stronger.

[0132] Optionally, the body 1234 of one of the first side plates 1231, the other first side plate 1231, the second side plate 1232 and the first wall 1235 can be integrally stamped and sheet metal bent, and the surfaces can be connected by welding.

[0133] In some possible embodiments, see Figures 1 to 15 As shown, the battery cell also includes two electrode terminals 125 disposed on the end cap 122, and the two electrode terminals 125 are respectively connected to the electrode assembly 124.

[0134] The bottom side 1243 of the electrode assembly 124, which is located away from the electrode terminal 125 along the third direction Z, contacts the first region 410, so that a gap is formed between the bottom side 1243 and the second region 420.

[0135] Electrode terminal 125 can be used to electrically connect to electrode assembly 124 for outputting or inputting electrical energy to battery cell 121.

[0136] By establishing a direct contact between the bottom side 1243 of the electrode assembly 124, which is away from the electrode terminal 125 in the third direction Z, and the first region 410 protruding inward on the first wall 1235 of the housing 123, it is ensured that the edge of the bottom side 1243 is spaced from the second region 420 of the first wall. This effectively avoids direct interference and continuous mechanical compression between the right-angle edge or side of the electrode assembly 124 and the first wall 1235 of the housing 123, thereby mitigating electrode damage, electrode delamination, and the risk of corner lithium plating caused by such compression. This can improve the cycle performance and safety of the battery cell 121, resulting in better performance of the battery device 100.

[0137] In this design, the opening 1236 and the first wall 1235 are located at the two ends of the housing 123 along the third direction Z, respectively. This ensures that while the end cap 122 where the electrode terminal 125 is located constrains the top of the electrode assembly 124 along the third direction Z, the bottom side 1243 of the electrode assembly 124 is supported and raised by the boss of the first region 410, so that the edge of its bottom side 1243 is completely separated from the second region 420 of the first wall 1235. This can effectively maintain the relatively centered and stable position of the electrode assembly 124 in the housing 123, prevent it from shifting during manufacturing, transportation or use, and ensure the uniformity and consistency of the interface state of the battery device 100 during long-term cycling, thereby significantly improving the cycle life and safety reliability of the battery device 100.

[0138] A second aspect of this application provides a battery device 100, including the battery cell 121 described above.

[0139] A third aspect of this application provides an electrical device, which includes the aforementioned battery cell 121, the battery cell 121 being used to provide electrical energy to the electrical device. Alternatively, the electrical device includes the aforementioned battery device 100, the battery device 100 being used to provide electrical energy to the electrical device.

[0140] 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.

[0141] 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 by, The battery cell comprises: an end cover (122); a shell (123) comprising an opening (1236) at one end and a first wall (1235) opposite to the opening; the end cover (122) covers the opening (1236) of the shell (123) to form a containing cavity (1237); a side of the first wall (1235) facing the opening (1236) comprises a first area (410) and a second area (420) surrounding the first area (410); the first area (410) is arranged protruding towards the opening (1236) relative to the second area (420); and an electrode assembly (124) arranged in the containing cavity (1237); at least a part of the electrode assembly (124) is in contact with the first area (410) so that a gap is formed between the electrode assembly (124) and the second area (420).

2. The battery cell of claim 1, wherein, The first wall (1235) comprises a circular arc curved surface structure, and the first area (410) and the second area (420) are connected by the circular arc curved surface structure.

3. The battery cell of claim 1, wherein, The orthographic projection of the first area (410) on the first wall (1235) is a square, a rectangle, a circle or an ellipse.

4. The battery cell of claim 1, wherein, The distance between the edge of the first area (410) and the edge of the first wall (1235) is L1, and 3mm≤L1≤20mm; And / or, the height difference between the first area (410) and the second area (420) is L2, and 0.2mm≤L2≤5mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The shell (123) comprises a plurality of side plates; all the side plates are sequentially arranged around the first wall (1235) and form the opening (1236) at the end away from the first wall (1235); At least one of the side plates comprises a protruding area and a clearance area surrounding the protruding area; the protruding area is arranged protruding towards the inside of the containing cavity (1237) relative to the clearance area; At least a part of the electrode assembly (124) is in contact with the protruding area so that a gap is formed between the electrode assembly (124) and the clearance area.

6. The battery cell according to any one of claims 1 to 4, characterized in that, The shell (123) comprises two first side plates (1231) arranged opposite along a first direction (X) and two second side plates (1232) arranged opposite along a second direction (Y); the area of the first side plate (1231) is greater than that of the second side plate (1232) and the first wall (1235); The first wall (1235) and the opening (1236) are arranged opposite along a third direction (Z); One of the first side plates (1231), one of the second side plates (1232), the other first side plate (1231) and the other second side plate (1232) are sequentially arranged around the first wall (1235); The first direction (X), the second direction (Y) and the third direction (Z) are arranged intersecting with each other and are not coplanar.

7. The battery cell of claim 6, wherein, The first side plate (1231) comprises a third region (430) and a fourth region (440) surrounding the third region (430); the third region (430) is arranged protruding inwardly of the accommodating cavity (1237) relative to the fourth region (440); The first side surface (1241) of the electrode assembly (124) along the first direction (X) is in contact with the third region (430), so that a gap is formed between the first side surface (1241) of the electrode assembly (124) and the fourth region (440).

8. The battery cell of claim 7, wherein, The distance between the edge of the third region (430) and the edge of the first side plate (1231) is L3, and 3mm≤L3≤20mm; And / or, the height difference between the third region (430) and the fourth region (440) is L4, and 0.2mm≤L4≤5mm.

9. The battery cell of claim 6, wherein, The second side plate (1232) comprises a fifth region (450) and a sixth region (460) surrounding the fifth region (450); the fifth region (450) is arranged protruding inwardly of the accommodating cavity (1237) relative to the sixth region (460); The second side surface (1242) of the electrode assembly (124) along the second direction (Y) is in contact with the fifth region (450), so that a gap is formed between the second side surface (1242) of the electrode assembly (124) and the sixth region (460).

10. The battery cell of claim 9, wherein, The distance between the edge of the fifth region (450) and the edge of the second side plate (1232) is L5, and 3mm≤L5≤20mm; And / or, the height difference between the fifth region (450) and the sixth region (460) is L6, and 0.2mm≤L6≤5mm.

11. The battery cell of claim 6, wherein, One of the first side plates (1231) comprises a plate body (1234) and a cover plate (1233); the plate body (1234) is formed with a notch (1238), and the cover plate (1233) is arranged on the notch (1238).

12. The battery cell of claim 6, wherein, The battery monomer further comprises two electrode terminals (125) arranged on the end cover (122); the two electrode terminals (125) are respectively connected with the electrode assembly (124); The bottom side surface (1243) of the electrode assembly (124) along the third direction (Z) away from the electrode terminal (125) is in contact with the first region (410), so that a gap is formed between the bottom side surface (1243) and the second region (420).

13. A battery device characterized by comprising: The battery monomer as claimed in any one of claims 1 to 12.

14. An electrical device, comprising: The battery monomer as claimed in any one of claims 1 to 12 is used to provide electric energy; or, the electric device comprises the battery device as claimed in claim 13, and the battery device is used to provide electric energy.

Images