Battery cell, battery device, and electric device

Abstract

The application belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a support and a side support. The shell comprises a shell body and an end cover connected to an end of the shell body, and the end cover and the shell body form a cavity. The electrode assembly is arranged in the cavity. The support is arranged in the cavity, and the first end of the electrode assembly adjacent to the end cover and the second end opposite to the first end are both provided with the support. The side support comprises a main body and a connecting part protruding from the surface of the main body. The surface between the first end and the second end of the electrode assembly is a side surface of the electrode assembly. The main body is arranged on the side surface of the electrode assembly to support the electrode assembly. The connecting part is connected with the support to position the main body. The application aims to reduce the risk of damage caused by the hard collision between the electrode assembly and the side support structure.

Description

Technical Field

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

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source. Battery devices include battery cells, which are the main components for charging and discharging. Inside the battery cell are electrode assemblies, which include positive and negative electrode plates and separators, which are arranged in a certain form.

[0003] Inside the battery cell, there is also a side support plate, which is usually set between the electrode assembly and the inner wall of the battery cell housing to support the side of the electrode assembly. During the use of the battery device, the electrode assembly may be subjected to hard collision and compression with the side support plate, causing damage to the electrode assembly. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which aims to reduce the risk of damage caused by hard collision between the electrode assembly and the side support structure.

[0005] To address the aforementioned problems, in a first aspect, this application provides a single battery cell, comprising:

[0006] The outer casing includes a housing and an end cap connected to an end of the housing, the end cap and the housing forming a cavity;

[0007] The electrode assembly is disposed in the cavity;

[0008] A bracket, located within the cavity, is provided at both the first end of the electrode assembly adjacent to the end cap and the second end opposite to the first end; and

[0009] A side support, comprising a main body and a connecting portion protruding from the surface of the main body, wherein the surface of the electrode assembly located between the first end and the second end is the side surface of the electrode assembly, the main body is located on the side surface of the electrode assembly to support the electrode assembly, and the connecting portion is connected to the bracket to position the main body.

[0010] The advantage of this embodiment is that since the main body is not directly connected to the bracket, there is no position for the connecting bracket on the main body. This avoids the problem of the main body having too little deformation near the connection position, which could cause a hard impact on the electrode assembly, thus reducing the risk of damage to the electrode assembly due to hard impact.

[0011] In one embodiment of the first aspect, the connecting portion is connected to the bracket at the end away from the main body portion.

[0012] This embodiment provides that the main body is connected to the bracket through a connecting part, so that the connection position with the bracket is located on the connecting part, specifically the connecting part. The connecting part is located at the end of the connecting part away from the main body, which is equivalent to being away from the main body. The entire plate of the main body can undergo a certain deformation, reducing the risk of damage to the electrode assembly due to hard impact.

[0013] In one embodiment of the first aspect,

[0014] With the extension direction of the connecting portion away from the main body portion as the second direction, the length of the connecting portion in the second direction is 7.5mm to 15.6mm.

[0015] This embodiment provides a length value for the connecting part in the second direction. Within this length value range, when the connecting part used to connect with the bracket is located at the end of the connecting part that is far away from the main body, it is possible to maintain an appropriate distance between the connecting part and the main body, so that the main body maintains a certain elasticity without affecting the support capacity.

[0016] In one embodiment of the first aspect, the connecting portion and the main body portion have an included angle of 70 degrees to 110 degrees.

[0017] The advantage of this embodiment is that the cantilever structure allows the connecting part to extend to other side walls of the bracket. When the main body is located on one side of the electrode assembly, the connecting part extends to other sides, thereby moving away from the main body and reducing the impact on the elasticity of the main body.

[0018] In one embodiment of the first aspect, the included angle is 90 degrees.

[0019] In this embodiment, the connecting portion extends vertically away from the main body, resulting in better performance.

[0020] In one embodiment of the first aspect, the connecting portion has a connecting surface parallel to the side wall surface of the corresponding bracket, the connecting surface being connected to the bracket.

[0021] The advantage of this embodiment is that by connecting the parallel connecting surfaces to the side wall of the bracket, the connection is easier and the connection effect between the opposite or contacting surfaces is better.

[0022] In one embodiment of the first aspect, the direction from the first end to the second end is a first direction, and the length of the connecting surface along the first direction is 70% to 80% of the thickness of the bracket in the first direction.

[0023] The advantage of this embodiment is that it provides a range of length values ​​for the connecting surface in the first direction, which satisfies the usage requirements without increasing the setup cost.

[0024] In one embodiment of the first aspect, the area of ​​the connecting surface is greater than 5 square millimeters.

[0025] This embodiment provides a connection surface area greater than 5 square millimeters, which can meet the requirements.

[0026] In one embodiment of the first aspect, the connection portion connecting the connecting part to the bracket and the main body portion are located on different sides of the bracket.

[0027] The advantage of this embodiment is that when the connecting part is connected to the side wall of the bracket, it is equivalent to being far away from the main body. The main body as a whole has good elasticity, which can reduce the risk of hard impact with the electrode assembly.

[0028] In one embodiment of the first aspect, the side support includes at least two connecting portions, each of which is located on the same surface of the main body. This improves the stability of the connection.

[0029] In one embodiment of the first aspect, both the main body and the connecting portion are plate-like structures. This provides better support for the electrode assembly.

[0030] In one embodiment of the first aspect, the side with the largest area among the various sides of the electrode assembly is the large side, and the side with an area smaller than the large side is the small side. The main body is located at the small side, and the connecting portion extends to the side of the bracket corresponding to the large side.

[0031] The advantage of this embodiment is that by supporting the electrode assembly with a smaller side surface, it facilitates structural simplification and ease of installation.

[0032] In one embodiment of the first aspect, the connection between the connecting part and the bracket is one or more of welding, hot-melt connection, bonding, and riveting. The connection method can be one or more of welding, hot-melt connection, bonding, and riveting, and can be selected as needed.

[0033] In one embodiment of the first aspect, the direction from the first end to the second end is a first direction, and the length of the main body portion in the first direction is greater than the length of the electrode assembly in the first direction; the direction perpendicular to the first direction on the plane where the main body portion is located is a third direction, and in the third direction, the length of the main body portion is equal to 80% to 90% of the length of the electrode assembly in the third direction.

[0034] This embodiment provides the dimensions of the main body. The length L4 of the main body in the third direction is 80% to 90% of the length of the electrode assembly in the third direction. This saves on the amount of material used in the main body, and when it is 80% to 90% of the length of the electrode assembly, it does not affect the support effect on the electrode assembly. The length L3 of the main body in the first direction is greater than the length of the electrode assembly in the first direction, which facilitates the connection of the main body to the bracket via the connecting part.

[0035] In one embodiment of the first aspect, the thickness of the main body portion in a direction perpendicular to both the first direction and the third direction is 0.3 mm to 0.5 mm.

[0036] This size meets the usage requirements, has a certain degree of elasticity, and provides sufficient support strength.

[0037] In a second aspect, this application provides a battery device comprising the battery cell described in any of the embodiments.

[0038] Thirdly, this application provides an electrical device, including the battery device described in the above embodiments.

[0039] 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

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0042] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0044] Figure 4 for Figure 3 A schematic diagram of the internal structure of a single battery cell after the casing has been removed.

[0045] Figure 5 for Figure 4A structural diagram from another perspective;

[0046] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0047] Figure 7 for Figure 5 A top-view structural diagram;

[0048] Figure 8 This is a schematic diagram of the structure of the side support provided in some embodiments of this application;

[0049] Figure 9 for Figure 8 An enlarged schematic diagram of point B in the middle.

[0050] The reference numerals in the detailed embodiments are as follows:

[0051] 1000, vehicles;

[0052] 100. Battery assembly; 200. Controller; 300. Motor;

[0053] 10. Battery cell; 101. Housing; 102. Electrode assembly; 103. End cap; 104. Bracket; 105. Side support; 1051. Main body; 1052. Connecting part; 1054. Connecting part; 1055. Connecting surface;

[0054] 20. Box body. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0058] 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.

[0059] 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.

[0060] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0061] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to 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.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0063] 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 military and police equipment and aerospace. With the continuous expansion of battery application areas, the market demand is also constantly increasing.

[0064] The battery unit is a complete structural unit, including a housing. Multiple individual battery cells are housed inside the housing; in some special scenarios, only one individual battery cell may be housed inside the housing. When there are multiple individual battery cells, they can be arranged in a row to form a battery cell assembly.

[0065] A battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed series-parallel configurations via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0067] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0068] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0069] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0070] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0071] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0072] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0073] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] This application also provides an electrical device having a battery device 100, that is, an electrical device that uses the battery device 100 as a power source.

[0075] The technical solutions described in this application are applicable to various electrical devices using battery device 100, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0076] The battery device 100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can use power systems equipped with the battery device 100 disclosed in this application, which helps improve the reliability of the electrical devices.

[0077] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of the electrical device provided in this application.

[0078] 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.

[0079] 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.

[0080] like Figure 2The battery device 100 provided in this application embodiment has a battery cell 10 as an energy storage component that can perform charge and discharge reactions. The battery cell 10 is disposed in the housing 20. Inside the battery cell 10 is an electrode assembly 102, which includes positive and negative electrode plates and a separator.

[0081] In related technologies, side supports inside the battery cell are located on the side of the electrode assembly to support it. The side supports are sheet-like structures and are usually connected and fixed to the internal structure of the battery cell. This can be done by connecting the side supports directly to the support, such as by directly bonding or riveting the side supports to the support. Since the connection point is on the side supports themselves, the elastic deformation capability of the side supports at or near this connection point becomes poor. When the part of the electrode assembly near this connection point is squeezed against the side supports at this location, the electrode assembly is at greater risk of being damaged by a hard impact due to the poor elasticity of the side supports at this location.

[0082] Therefore, it is necessary to improve the elasticity of the side support and reduce the impact of the connection position. Thus, this application provides a battery cell 10 to reduce the risk of damage to the electrode assembly 102 due to hard compression.

[0083] Please see Figures 3-9 This application provides a battery cell 10, including a housing, an electrode assembly 102, a bracket 104, and a side support 105.

[0084] The outer casing includes a housing 101 and an end cap 103 connected to the end of the housing 101. The end cap 103 and the housing 101 enclose a cavity. An electrode assembly 102 is disposed in the cavity. A support 104 is located in the cavity. The support 104 is provided at both the first end of the electrode assembly 102 adjacent to the end cap 103 and the second end opposite to the first end. The side support 105 includes a main body 1051 and a connecting part 1052 protruding from the surface of the main body 1051. The surface of the electrode assembly 102 between the first end and the second end is the side surface of the electrode assembly 102. The main body 1051 is located on the side surface of the electrode assembly 102 to support the electrode assembly 102. The connecting part 1052 is connected to the support 104 to position the main body 1051.

[0085] The housing 101 and the end cap 103 form a cavity; the electrode assembly 102 is disposed in the cavity; the end cap 103 is disposed on the end side of the housing 101 to close the housing 101; the bracket 104 is located in the cavity, and the bracket 104 is disposed at the end of the electrode assembly 102 adjacent to the end cap 103 and at the end of the electrode assembly 102 opposite to the end of the end cap 103.

[0086] Specifically, the cavity is used to accommodate the electrode assembly 102, the support 104, and the side support 105, and an end cap 103 and a housing 101 are provided to form a closed electrochemical reaction environment inside the battery cell 10. The support 104 is provided at both ends of the electrode assembly 102, specifically, a support 104 is provided separately at both the first and second ends of the electrode assembly 102.

[0087] The side support 105 is disposed on the side of the electrode assembly 102 to support the electrode assembly 102. The side of the electrode assembly 102 refers to the side of the electrode assembly 102 inside the battery cell 10 excluding the two ends. The main body 1051 of the side support 105 is disposed on the side of the electrode assembly 102 to support the electrode assembly 102. In this embodiment, the main body 1051 is fixed by connecting the connecting part 1052 to the bracket 104, and is not directly connected to the bracket 104 through the main body 1051.

[0088] The advantage of this embodiment is that since the main body 1051 is not directly connected to the bracket 104, there is no position on the main body 1051 to connect the bracket 104. This avoids the problem that the main body 1051 has too little deformation near the connection position and will cause a hard impact on the electrode assembly 102, thus reducing the risk of damage to the electrode assembly 102 due to hard impact.

[0089] In some embodiments, please refer to Figure 9 The connecting portion 1052 is connected to the bracket 104 at the end away from the main body portion 1051. That is, the connecting portion 1054 for connecting the connecting portion 1052 to the bracket 104 is located at the free end of the connecting portion 1052 away from the main body portion 1051.

[0090] Specifically, in this embodiment, the main body 1051 is connected to the bracket 104 via the connecting part 1052, such that the connection position with the bracket 104 is located on the connecting part 1052, specifically the connecting part 1054 of the connecting part 1052. The connecting part 1054 is located at the end of the connecting part 1052 away from the main body 1051, which is equivalent to being away from the main body 1051. The entire plate of the main body 1051 can undergo a certain deformation, reducing the risk of damage to the electrode assembly 102 due to hard impact.

[0091] In some embodiments, please refer to Figures 4-9 The second direction is the extension direction of the connecting part 1052 away from the main body part 1051, and the length of the connecting part 1052 in the second direction is 7.5mm to 15.6mm.

[0092] The direction in which the connecting part 1052 extends away from the main body 1051 refers to the direction from the position on the connecting part 1052 that connects to the main body 1051 to the connecting part 1054 on the connecting part 1052 that connects to the bracket 104. This direction is the second direction M. The length of the connecting part 1052 in the second direction M is 7.5mm to 15.6mm.

[0093] The connecting part 1052 is connected to the main body part 1051. The direction of the connection position of the two towards the connecting part 1054 is the second direction, which is the M direction in the figure. The length L2 of the connecting part 1052 in the second direction is 7.5mm to 15.6mm.

[0094] The connecting part 1052 can also be a plate-shaped structure extending in a certain direction. The second direction can be understood as the direction in which the connecting part 1052 extends along the length of the plate from the position where it is connected to the main body 1051, that is, the second direction. The end along the second direction is the connecting part 1054 mentioned above.

[0095] This embodiment provides a length value for the connecting part 1052 in the second direction. Within this length value range, when the connecting part 1054 for connecting the connecting part 1052 to the bracket 104 is located at the end of the connecting part 1052 away from the main body 1051, it is possible to maintain an appropriate distance between the connecting part 1054 and the main body 1051, so that the main body 1051 maintains a certain elasticity without affecting the support capacity.

[0096] In some embodiments, please refer to Figure 8 and Figure 9 The connecting part 1052 and the main body part 1051 have an included angle of 70 degrees to 110 degrees.

[0097] Specifically, the connecting part 1052 can be plate-shaped, which facilitates connection with the support 104. The connecting part 1052 and the main body 1051 have an angle, defined as α, which is 70 degrees to 110 degrees. This is equivalent to the connecting part 1052 extending out of the main body 1051, resembling a cantilever. When the main body 1051 is located on the side of the electrode assembly 102, the connecting part 1052 can extend to other sides of the electrode assembly 102, that is, to the side wall of the support 104 corresponding to the other sides, away from the main body 1051.

[0098] The advantage of this embodiment is that the cantilever structure facilitates the extension of the connecting part 1052 to other side walls of the support 104. When the main body 1051 is located on one side of the electrode assembly 102, the connecting part 1052 extends to other sides, thereby moving away from the main body 1051 and reducing the impact on the elasticity of the main body 1051.

[0099] In some embodiments, please refer to Figure 8 and Figure 9 The included angle is 90 degrees.

[0100] Specifically, this embodiment further provides an included angle α of 90 degrees, meaning that the connecting portion 1052 and the main body 1051 are perpendicular to each other. This allows the connecting portion 1052 to extend vertically away from the main body 1051, resulting in better performance. Especially when the electrode assembly 102 has a cuboid structure, the support 104 also adopts a rectangular cross-section. The perpendicular relationship between the connecting portion 1052 and the main body 1051 makes it easier for the connecting portion 1052 to extend into the sidewall of the support 104 corresponding to other sides of the electrode assembly 102, thus connecting the connecting portion 1052 to the support 104.

[0101] In some embodiments, please refer to Figures 4-7 The connecting part 1052 has a connecting surface 1055 parallel to the side wall surface of the corresponding bracket 104, and the connecting surface 1055 is connected to the bracket 104.

[0102] The connecting part 1052 is connected to the bracket 104 through the connecting surface 1055, and the connecting surface 1055 is parallel to the side wall surface of the bracket 104 to which it is connected.

[0103] The connecting part 1052 is connected to the bracket 104 through the connecting surface 1055, making the connection simpler and more reliable. The connecting surface 1055 is parallel to the side wall surface of the bracket 104 to which it is connected.

[0104] Specifically, the bracket 104 has a side wall surface. In this embodiment, the connecting surface 1055 is set to be parallel to the side wall surface of the bracket 104. When connecting, the connection can be achieved by mutual contact.

[0105] The advantage of this embodiment is that the connection between the parallel connecting surfaces 1055 and the side wall surfaces of the bracket 104 is easier, and the connection effect between the opposite or contacting surfaces is better.

[0106] In some embodiments, please refer to Figures 4-9 The direction from the first end to the second end is the first direction. The connecting part 1052 is connected to the bracket 104 through the connecting surface 1055. The length of the connecting surface 1055 along the first direction is 70% to 80% of the thickness of the bracket 104 in the first direction.

[0107] Specifically, the first direction is the X direction in the figure, which is also the thickness direction of the support 104.

[0108] The connecting part 1052 can be connected to the bracket 104 via the connecting surface 1055. When the connecting part 1052 is a connecting plate, the connecting surface 1055 is the surface of the connecting plate facing the bracket 104. The connecting surface 1055 is attached to the side wall of the bracket 104 by means of bonding, specifically by means of heat fusion.

[0109] The bracket 104 has a certain thickness d1 in the first direction. The length L1 of the connecting surface 1055 in the first direction should be less than the thickness d1 of the bracket 104. Therefore, in this embodiment, the length L1 of the connecting surface 1055 in the first direction is 70% to 80% of the thickness d1 of the bracket 104.

[0110] The advantage of this embodiment is that it provides a range of length values ​​for the connecting surface 1055 in the first direction, which satisfies the usage requirements without increasing the setup cost.

[0111] In some embodiments, the area of ​​the connecting surface 1055 is greater than 5 square millimeters.

[0112] Specifically, when the connecting surface 1055 is bonded to the side wall of the bracket 104, such as through heat fusion, a certain connecting area is required to achieve sufficient firmness. Therefore, in this embodiment, the area of ​​the connecting surface 1055 is greater than 5 square millimeters to meet the requirements. When the connecting surface 1055 is rectangular, with the length L1 along the first direction being one side length, the other side length must be greater than 5 square millimeters / L1.

[0113] In some embodiments, please refer to Figures 4-9 The length of the connecting portion 1052 along the first direction is equal to the length of the connecting surface 1055 along the first direction.

[0114] In this embodiment, the length L1 of the connecting surface 1055 along the first direction is equal to the length of the connecting portion 1052 in the first direction, that is, the length of the connecting surface 1055 is equal to the length of the connecting portion 1052.

[0115] The connecting surface 1055 can be a rectangular surface, and the connecting part 1052 can also be a rectangular plate.

[0116] This embodiment provides that the length of the connecting portion 1052 along the first direction is equal to the length of the connecting surface 1055 along the first direction. This configuration simplifies the structure of the connecting portion 1052 and eliminates any redundant portions in the connecting portion 1052 that have a length greater than that of the connecting surface 1055.

[0117] In some embodiments, please refer to Figures 4-7 The connecting part 1054, which connects the connecting part 1052 to the bracket 104, and the main body 1051 are located on different sides of the bracket 104.

[0118] The connecting part 1054 and the main body 1051 are located on different sides of the bracket 104.

[0119] Specifically, the connecting part 1054 is not located on the side of the electrode assembly 102 where the main body 1051 is located, and the side wall of the bracket 104 to which it is connected is not on the side wall of the bracket 104 where the main body 1051 is located. Specifically, the connecting part 1054 and the main body 1051 are located on different sides of the bracket 104.

[0120] The bracket 104 is located at the end of the electrode assembly 102. Its cross-section is similar to that of the electrode assembly 102. Therefore, each side wall of the bracket 104 is provided corresponding to each side of the electrode assembly 102. Each side of the electrode assembly 102 is provided with a side wall surface of the bracket 104.

[0121] The advantage of this embodiment is that when the connecting part 1054 is connected to the side wall of the bracket 104, it is equivalent to being far away from the main body 1051. The main body 1051 has good elasticity as a whole, which can reduce the risk of hard impact with the electrode assembly 102.

[0122] In some embodiments, please refer to Figure 8 The side support 105 includes at least two connecting parts 1052, and each connecting part 1052 is provided on the same surface of the main body 1051.

[0123] There are at least two connecting portions 1052 of the side support 105, and multiple connecting portions 1052 are provided on the same surface of the main body 1051.

[0124] Specifically, the side surface of the electrode assembly 102 has a certain area, so the supporting body 1051 also needs to have a certain area. The supporting body 1051 can be plate-shaped to support the side surface of the electrode assembly 102. For the plate-shaped supporting body 1051, at least two connecting parts 1052 are required when connecting to the bracket 104 to ensure a firm fixation. The brackets 104 are located at both ends of the electrode assembly 102. When the supporting body 1051 is located on the side surface of the electrode assembly 102, it can be connected to the brackets 104 at both ends of the electrode assembly 102 through the connecting parts 1052 located at both ends of the supporting body 1051. Therefore, the number of corresponding connecting parts 1052 is at least two to maintain the stability of the connection. Furthermore, multiple connecting parts 1052 are located on the same surface of the supporting body 1051, which facilitates two connecting parts 1052 to simultaneously connect to the corresponding side brackets 104.

[0125] In some embodiments, please refer to Figure 8 Multiple connecting parts 1052 are arranged symmetrically on the main body 1051 about the axis of symmetry of the surface of the main body 1051 in which they are located.

[0126] Multiple connecting parts 1052 are arranged symmetrically about the axis of symmetry of the main body 1051 on the surface of the main body 1051.

[0127] This embodiment provides that the surface of the main body 1051 has an axis of symmetry. Specifically, the connecting part 1052 serves as a connecting bracket 104. When the connecting parts 1052 are symmetrically arranged about the axis of symmetry on the plate surface of the main body 1051, the main body 1051 is connected to the bracket 104 through a more evenly distributed connection point, making the connection force at all points of the main body 1051 more balanced and the support force more reasonable. The connecting parts 1052 at both ends of the main body 1051 are respectively connected to the brackets 104 at different ends of the electrode assembly 102.

[0128] The axis of symmetry can be an axis parallel to the width or length direction of the surface.

[0129] Specifically, the main body 1051 can be a rectangular plate, so the plate surface of the main body 1051 has an axis of symmetry, which can be an axis parallel to the width direction of the plate surface or an axis parallel to the length direction of the plate surface; either axis is acceptable.

[0130] The advantage of this embodiment is that it provides a symmetrical arrangement, which allows for adaptive setting of the connecting part 1052 according to the position of the axis of symmetry.

[0131] In some embodiments, please refer to Figure 8 Both the main body 1051 and the connecting part 1052 are plate-shaped structures. The main body 1051 can be a rectangular plate, and the number of connecting parts 1052 can be four, respectively located at the four corners of the main body 1051.

[0132] Specifically, based on the common shape of the electrode assembly 102, this embodiment can appropriately set the main body 1051 as a rectangular plate, specifically a rectangular plate, for setting on the side of the electrode assembly 102, which can achieve better support for the electrode assembly 102. In addition, the connecting part 1052 can also be a plate-shaped structure. In this embodiment, four connecting parts 1052 are selected, and they are located at the corners of the rectangular plate. This position corresponds to the position of the bracket 104, which is easy to connect with the bracket 104. Furthermore, the four connecting parts 1052 are symmetrically positioned, making the position of the connecting parts 1052 reasonable after connection.

[0133] In some embodiments, such as Figure 4 The surface with the largest area among all sides of the electrode assembly 102 is called the large surface, and the surface with a smaller area among all sides is called the small surface. The main body 1051 is located at the small surface, and the connecting part 1052 extends to the side of the bracket 104 corresponding to the large surface.

[0134] The side surface area of ​​the electrode assembly 102 where the main body 1051 is located is smaller than the large surface area, and the connecting part 1052 extends to the side of the bracket 104 corresponding to the large surface.

[0135] Specifically, the main body 1051 is used to support the smaller side of the electrode assembly 102. For example, when the electrode assembly 102 is a cuboid structure, it supports two smaller opposing sides, while the connecting part 1052 extends to the side of the bracket 104 corresponding to the larger side.

[0136] The advantage of this embodiment is that by supporting the electrode assembly 102 with a smaller side surface, it facilitates structural simplification and ease of installation.

[0137] In some embodiments, the connection between the connecting part 1052 and the bracket 104 is one or more of welding, hot melt connection, bonding, and riveting.

[0138] The connection method can be one or more of welding, hot-melt connection, bonding, and riveting, which can be selected according to the needs. When hot-melt connection is used, the connecting part 1052 and the bracket 104 are heat-fused together, and the connection is achieved after cooling. Hot-melt connection is simple and convenient to operate, and the connection has good stability.

[0139] In some embodiments, please refer to Figures 4-9 The direction from the first end to the second end is the first direction. The length of the main body 1051 in the first direction is greater than the length of the electrode assembly 102 in the first direction. The direction perpendicular to the first direction on the plane where the main body 1051 is located is the third direction. In the third direction, the length of the main body 1051 is equal to 80% to 90% of the length of the electrode assembly 102 in the third direction.

[0140] Specifically, the length of the main body 1051 in the first direction is L3, and the length of the main body 1051 in the third direction is L4. The third direction is the Z direction in the figure, and the first direction is the X direction in the figure.

[0141] This embodiment provides the dimensions of the main body 1051. The length L4 of the main body 1051 in the third direction is 80% to 90% of the length of the electrode assembly 102 in the third direction. This saves on the amount of material used in the main body 1051, and when it is 80% to 90% of the length of the electrode assembly 102, it does not affect the supporting effect on the electrode assembly 102. The length L3 of the main body 1051 in the first direction is greater than the length of the electrode assembly 102 in the first direction, which facilitates the connection of the main body 1051 to the bracket 104 via the connecting part 1052.

[0142] In some embodiments, please refer to Figures 4-9The thickness of the main body 1051 in the direction perpendicular to both the first direction and the third direction is 0.3mm to 0.5mm.

[0143] The direction perpendicular to both the first direction X and the third direction Z can be defined as the fourth direction Y, as shown in the Y direction in the figure. The thickness of the main body 1051 in the fourth direction Y is d2, specifically ranging from 0.3mm to 0.5mm. This size is sufficient to meet the usage requirements, providing a certain degree of elasticity and adequate support strength. The extension direction of the connecting part 1052 away from the main body 1051 is the second direction M. When the connecting part 1052 extends in a direction perpendicular to the main body 1051, the second direction M and the fourth direction Y can be the same direction.

[0144] This application also provides a battery device 100, including a battery cell 10 provided in any embodiment.

[0145] This application also provides an electrical device, including the battery device 100 provided in any embodiment.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a housing and an end cap connected to an end of the housing, the end cap and the housing forming a cavity; The electrode assembly is disposed in the cavity; A bracket is located in the cavity, and the bracket is provided at both the first end of the electrode assembly adjacent to the end cap and the second end opposite to the first end. as well as A side support, comprising a main body and a connecting portion protruding from the surface of the main body, wherein the surface of the electrode assembly located between the first end and the second end is the side surface of the electrode assembly, the main body is located on the side surface of the electrode assembly to support the electrode assembly, and the connecting portion is connected to the bracket to position the main body.

2. The battery cell as described in claim 1, characterized in that, The connecting portion is connected to the bracket at the end away from the main body.

3. The battery cell as described in claim 2, characterized in that, With the extension direction of the connecting portion away from the main body portion as the second direction, the length of the connecting portion in the second direction is 7.5mm to 15.6mm.

4. The battery cell as described in claim 1, characterized in that, The connecting part and the main body have an included angle, which is 70 degrees to 110 degrees.

5. The battery cell as described in claim 4, characterized in that, The included angle is 90 degrees.

6. The battery cell as described in claim 1, characterized in that, The connecting part has a connecting surface parallel to the side wall surface of the corresponding bracket, and the connecting surface is connected to the bracket.

7. The battery cell as described in claim 6, characterized in that, The direction from the first end to the second end is the first direction, and the length of the connecting surface along the first direction is 70% to 80% of the thickness of the bracket in the first direction.

8. The battery cell as described in claim 7, characterized in that, The area of ​​the connecting surface is greater than 5 square millimeters.

9. The battery cell as described in claim 1, characterized in that, The connection part that connects to the bracket and the main body part are located on different sides of the bracket.

10. The battery cell as described in claim 1, characterized in that, The side support includes at least two connecting parts, each of which is located on the same surface of the main body.

11. The battery cell as described in claim 1, characterized in that, Both the main body and the connecting part are plate-shaped structures.

12. The battery cell as described in claim 1, characterized in that, The side with the largest area among all sides of the electrode assembly is the large side, and the side with a smaller area than the large side is the small side. The main body is located at the small side, and the connecting part extends to the side of the bracket corresponding to the large side.

13. The battery cell according to any one of claims 1-12, characterized in that, The connection between the connecting part and the bracket is one or more of the following: welding, hot melt connection, bonding, and riveting.

14. The battery cell according to any one of claims 1-6 and 9-12, characterized in that, The direction from the first end to the second end is the first direction, and the length of the main body in the first direction is greater than the length of the electrode assembly in the first direction; the direction perpendicular to the first direction on the plane where the main body is located is the third direction, and in the third direction, the length of the main body is equal to 80% to 90% of the length of the electrode assembly in the third direction.

15. The battery cell as described in claim 14, characterized in that, The thickness of the main body is 0.3 mm to 0.5 mm in the direction perpendicular to both the first direction and the third direction.

16. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-15.

17. An electrical appliance, characterized in that, Includes the battery device as described in claim 16.

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