Battery cells, battery packs, and electrical devices

Abstract

This invention relates to the field of battery technology, and discloses a battery cell, a battery device, and an electrical device. The battery cell includes: a housing with end caps; an electrode structure disposed within the housing, the electrode structure including electrode components and an encapsulating insulating film; and an insulating support disposed within the housing, the insulating support including a support body and a connecting portion, the connecting portion being fixed to the support body and fixedly connected to the encapsulating insulating film, the melting point of the support body being higher than the melting point of the connecting portion; the connecting portion including multiple sub-connecting portions; the multiple sub-connecting portions including a first sub-connecting portion, the first sub-connecting portion including a first connecting body, the first connecting body being assembled in a first mounting groove. Thus, by setting the support body and the connecting portion, the support body is heat-resistant, which helps to improve the heat resistance of the insulating support, thereby reducing the risk of the insulating support melting and forming barbs that insert into the electrode components, reducing the risk of thermal runaway of the entire battery device, and thus improving the reliability of the battery cell and the battery device.

Description

Technical Field

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

[0002] In related technologies, existing battery cells contain an insulating support (i.e., a lower plastic layer), which connects the end cap of the outer casing to the insulating film covering the outer side of the electrode assembly. The connection between the existing insulating support and the insulating film typically requires processing at high temperatures to achieve good adhesion and sealing between them. However, in the event of thermal runaway in the battery cell, the insulating support near the electrode assembly is prone to melting due to the high temperature. The melted insulating support can easily form barbs that insert into the electrode assembly, posing a short-circuit risk to the battery cell. This can easily lead to thermal runaway in the entire battery device, thus affecting the reliability of both the battery cell and the entire battery system. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this invention is to provide a battery cell that reduces the risk of insulating support melting and forming barbs that insert into the electrode assembly, thereby reducing the risk of thermal runaway in the entire battery device and thus improving the reliability of both the battery cell and the battery device.

[0004] The present invention further proposes a battery device.

[0005] The present invention further proposes an electrical device.

[0006] In a first aspect, embodiments of the present invention provide a battery cell, comprising:

[0007] The outer casing has end caps;

[0008] The electrode structure is located inside the housing and includes an electrode assembly and an encapsulation insulating film, wherein the encapsulation insulating film encapsulates the electrode assembly.

[0009] An insulating support is disposed within a housing and located between an end cap and an electrode structure, and is fixed to the end cap. The insulating support includes a support body and a connecting portion, the connecting portion being fixed to the support body and fixedly connected to an encapsulating insulating film, wherein the melting point of the support body is higher than the melting point of the connecting portion; the connecting portion includes multiple sub-connecting portions, the multiple sub-connecting portions being arranged at different positions on the support body, and each of the multiple sub-connecting portions being fixedly connected to the encapsulating insulating film; the multiple sub-connecting portions are arranged sequentially at intervals along a first direction, the first direction being perpendicular to the arrangement direction of the insulating support and the end cap; the multiple sub-connecting portions include a first sub-connecting portion, the first sub-connecting portion including a first connecting body, the first connecting body being provided on at least one side of the support body along a second direction, the first connecting body being fixedly connected to the encapsulating insulating film, the first direction being perpendicular to the second direction, and the second direction also being perpendicular to the arrangement direction of the insulating support and the end cap; along the second direction, a first mounting groove is formed on the side of the support body where the first connecting body is provided, the first connecting body being assembled in the first mounting groove.

[0010] In the above technical solution, by setting a support body and a connecting part, the connecting part is connected to the encapsulation insulating film by heat fusion, which meets the connection requirements between the insulating support and the encapsulation insulating film. Furthermore, the melting point of the support body is higher than that of the connecting part. The support body is resistant to high temperature, which can significantly increase the amount of high temperature resistant material used in the insulating support. This is beneficial to improving the high temperature resistance of the insulating support and reducing the risk of the insulating support melting at high temperature. This reduces the risk of the insulating support melting and forming barbs that insert into the electrode assembly, thereby reducing the risk of thermal runaway of the entire battery device. In this way, it is beneficial to improve the reliability of the battery cell and the battery device.

[0011] The presence of multiple sub-connectors allows for connection between the insulating support and the encapsulating insulating film at multiple different locations. This helps to ensure even stress distribution on the insulating support, reduces the risk of deformation caused by stress concentration, and thus helps maintain the operational reliability of the insulating support.

[0012] By arranging multiple sub-connecting parts sequentially and at intervals along the first direction, the multiple sub-connecting parts can be arranged at intervals along the length direction of the insulating support, making the position arrangement of the multiple sub-connecting parts more reasonable. This is more conducive to the uniform stress distribution on the insulating support, which can further reduce the risk of deformation of the insulating support due to stress concentration, and thus is more conducive to maintaining the working reliability of the insulating support.

[0013] By providing a first connector on at least one side of the support body along the second direction, the first connector can be fixedly connected to the encapsulation insulating film in the side, which facilitates the connection between the first sub-connection and the encapsulation insulating film, improves the connection efficiency between the encapsulation insulating film and the first sub-connection, and is conducive to improving the assembly efficiency of the battery cell, thereby improving the production efficiency of the battery cell, and making the setting position of the first connector reasonable.

[0014] By assembling the first connector into the first mounting groove, the sidewall of the first mounting groove can limit the corresponding first connector, which can reduce the risk of the first connector moving in a direction perpendicular to the second direction, and help improve the positional stability of the first connector. This reduces the risk of the first connector separating from the encapsulation insulating film due to movement of the first connector, and thus helps to reliably connect the first connector and the encapsulation insulating film.

[0015] In some embodiments, along the first direction, the two end sub-connecting portions are respectively located at the end positions of the support body.

[0016] In the above technical solution, by having the two sub-connecting parts located at the two ends of the support body, the end position of the insulating support along the first direction can be fixedly connected to the end position of the encapsulating insulating film along the first direction. This is more conducive to the uniform stress on the insulating support, and can further reduce the risk of deformation of the insulating support due to stress concentration. This is more conducive to maintaining the working reliability of the insulating support, and also conducive to the reliable connection between the insulating support and the encapsulating insulating film.

[0017] In some embodiments, along the first direction, the length of the first connector is less than or equal to the length of the first mounting groove, and the length of the first connector is greater than or equal to 5 mm.

[0018] In the above technical solution, by ensuring that the length of the first connector is less than or equal to the length of the first mounting groove and that the length of the first connector is greater than or equal to 5mm, the first connector can be thermally fused with the encapsulated insulating film. This reduces the size of the first connector and increases the mounting area of ​​the support body. This further reduces the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device. This, in turn, is more conducive to improving the reliability of the battery cell and the battery device.

[0019] In some embodiments, along the second direction, the thickness of the first connector is less than or equal to the depth of the first mounting groove, the thickness of the first connector is greater than or equal to 0.5 mm, and the depth of the first mounting groove is less than or equal to 2 mm.

[0020] In the above technical solution, along the second direction, the thickness of the first connector is less than or equal to the depth of the first mounting groove, and the thickness of the first connector is greater than or equal to 0.5mm. This is beneficial for the first connector to meet the requirements of thermal fusion connection with the encapsulation insulating film, and it is also beneficial to reduce the size of the first connector. This can further increase the setting area of ​​the bracket body, thereby further reducing the risk of the insulating bracket melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0021] In some embodiments, there are multiple first connectors, and along the second direction, the multiple first connectors are respectively disposed on both sides of the support body.

[0022] In the above technical solution, the first connectors are provided on both sides of the main body of the support along the second direction, which enables the insulating support to be connected to the encapsulation insulating film on both sides along the second direction. This increases the connection area between the encapsulation insulating film and the insulating support, thereby ensuring a reliable connection between the encapsulation insulating film and the insulating support, reducing the risk of separation between the encapsulation insulating film and the insulating support, and further promoting uniform stress distribution on the insulating support, which can further reduce the risk of deformation of the insulating support due to stress concentration.

[0023] In some embodiments, the first sub-connection portion further includes: a second connector, wherein there are two first connectors, the second connector extends along a second direction, and the second connector is connected between the two first connectors.

[0024] In the above technical solution, the second connector is connected between the two first connectors, which helps to improve the overall structure of the first sub-connector, enhances the structural strength of the first sub-connector, reduces the risk of the first connector separating from the encapsulation insulating film due to deformation of the first connector, and also helps to reliably fix the first sub-connector to the bracket body.

[0025] In some embodiments, along the second direction, a first mounting groove is formed on both sides of the bracket body, and two first connectors are respectively assembled into the first mounting groove on the corresponding side.

[0026] In the above technical solution, by assembling the first connector in the first mounting groove, the sidewall of the first mounting groove can limit the corresponding first connector, which can reduce the risk of the first connector moving in a direction perpendicular to the second direction, which is conducive to improving the positional stability of the first connector, thereby reducing the risk of the first connector separating from the encapsulation insulating film due to the movement of the first connector, and thus facilitating the reliable connection between the first connector and the encapsulation insulating film.

[0027] In some embodiments, the bracket body has two first sidewalls that are opposite to and spaced apart along a second direction, the first sidewalls having a first mounting groove, and the second connector passing through the two first sidewalls along the second direction.

[0028] In the above technical solution, a first mounting groove is formed through the first sidewall. After the first connector is assembled in the first mounting groove, the first connector is set inside the bracket body, which allows the first connector to be located on the outside of the bracket body along the second direction, thereby facilitating the connection between the first connector and the encapsulation insulating film. Furthermore, by having the second connector pass through the two first sidewalls, the second connector can be set inside the bracket body, making the structure of the bracket body and the first sub-connection part more compact, which is beneficial to reducing the volume of the insulating bracket.

[0029] In some embodiments, a first notch is formed in the first sidewall, the first notch penetrates the first sidewall along a second direction, and the second connector passes through the first notch in both first sidewalls.

[0030] In the above technical solution, a first notch is formed in the first sidewall, and the second connector passes through the first notch of the two first sidewalls, so that the second connector passes through the two first sidewalls in the second direction, thereby reducing the risk of interference between the second connector and the support body and allowing the second connector to be smoothly assembled into the support body.

[0031] In some embodiments, along the first direction, the width of the second connector is less than or equal to the width of the first notch, and the width of the second connector is greater than or equal to 0.5 mm.

[0032] In the above technical solution, along the first direction, the width of the second connector is less than or equal to the width of the first notch, and the width of the second connector is greater than or equal to 0.5mm. This allows the first connector to meet the requirements of thermal fusion connection with the encapsulation insulating film, which helps to reduce the size of the first sub-connector. This can further increase the setting area of ​​the support body, thereby further reducing the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0033] In some embodiments, along the second direction, the length dimension of the second connector minus the distance between the inner surfaces of the bottom walls of the two first mounting slots on both sides of the bracket body is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0034] In the above technical solution, by subtracting the distance between the inner surfaces of the bottom walls of the two first mounting grooves on both sides of the bracket body from the length of the second connector, which is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, it is beneficial to further reduce the size of the first sub-connector and further increase the installation area of ​​the bracket body. This can further reduce the risk of the insulating bracket melting and forming barbs that insert into the electrode assembly, further reduce the risk of thermal runaway of the entire battery device, and thus further improve the reliability of the battery cell and the battery device.

[0035] In some embodiments, the plurality of sub-connections include: a second sub-connection along a first direction, the second sub-connection being located at the end of the support body, the second sub-connection including: a third connector along a direction perpendicular to the arrangement direction of the insulating support and the end cap, the third connector being provided on at least one side of the support body, the third connector being fixedly connected to the encapsulation insulating film.

[0036] In the above technical solution, the second sub-connector is located at the end of the bracket body and along the direction perpendicular to the arrangement direction of the insulating bracket and the end cap. At least one side of the bracket body is provided with a third connector, which enables the third connector to be fixedly connected to the encapsulation insulating film laterally. This facilitates the connection between the second sub-connector and the encapsulation insulating film, improves the connection efficiency between the encapsulation insulating film and the second sub-connector, and is conducive to further improving the assembly efficiency of the battery cell. This is more conducive to improving the production efficiency of the battery cell, and makes the setting position of the third connector reasonable.

[0037] In some embodiments, there are multiple third connectors. Along the second direction, at least one side of the support body is provided with a third connector, and along the first direction, a third connector is provided at the corresponding end of the support body. The first direction and the second direction are perpendicular, and the second direction is also perpendicular to the arrangement direction of the insulating support and the end cap.

[0038] In the above technical solution, by providing a third connector on at least one side of the support body along the second direction and a third connector at the corresponding end of the support body along the first direction, the insulating support can be connected to the encapsulation insulating film in both the second and first directions. This is more conducive to increasing the connection area between the encapsulation insulating film and the insulating support, thereby making the encapsulation insulating film and the insulating support more reliably connected, further reducing the risk of separation between the encapsulation insulating film and the insulating support, and also more conducive to making the insulating support bear the force evenly, which can further reduce the risk of deformation of the insulating support due to stress concentration.

[0039] In some embodiments, along the first direction, the end of the bracket body has a mounting portion, the mounting portion has multiple mounting sidewalls, the multiple mounting sidewalls and multiple third connectors correspond one-to-one, and the third connectors are fixed to the corresponding mounting sidewalls.

[0040] In the above technical solution, the third connector is fixed to the corresponding mounting side wall, and the mounting side wall can support the third connector, which helps to improve the positional stability of the third connector.

[0041] In some embodiments, at least one mounting sidewall is formed with a second mounting groove, and a corresponding third connector is assembled in the second mounting groove.

[0042] In the above technical solution, by assembling the third connector in the second mounting groove, the sidewall of the second mounting groove can limit the corresponding third connector, which can reduce the risk of the third connector moving in the depth direction perpendicular to the second mounting groove, which is conducive to improving the positional stability of the third connector, thereby reducing the risk of the third connector separating from the encapsulation insulating film due to movement of the third connector, and thus facilitating the reliable connection between the third connector and the encapsulation insulating film.

[0043] In some embodiments, the third connector is connected to a limiting body, which includes a first limiting body and a second limiting body. The second limiting body and the corresponding third connector are opposite to and spaced apart. The first limiting body is connected between the third connector and the second limiting body. A second notch is formed in the mounting sidewall. The first limiting body passes through the second notch. The second limiting body is located on the side of the corresponding mounting sidewall away from the corresponding third connector, and the second limiting body is in contact with the surface of the mounting sidewall away from the corresponding third connector.

[0044] In the above technical solution, by forming a second notch in the mounting sidewall, the first limiting body passes through the corresponding second notch, achieving the effect of the first limiting body passing through the corresponding mounting sidewall, reducing the risk of interference between the first limiting body and the bracket body, and allowing the limiting body to be smoothly assembled into the bracket body. Furthermore, by having the second limiting body located on the side of the corresponding mounting sidewall away from the corresponding third connector, the second limiting body can contact and limit the mounting sidewall, and the third connector can also contact and limit the mounting sidewall, reducing the risk of the third connector moving along the arrangement direction of the third connector and the corresponding mounting sidewall, thereby allowing the third connector to be reliably fixed to the bracket body.

[0045] In some embodiments, the mounting portion has a limiting wall, and at least one third connector is provided with a limiting wall. The limiting wall is located on the side of the corresponding second limiting body away from the corresponding mounting side wall, and the limiting wall and the second limiting body are in contact.

[0046] In the above technical solution, the installation part has a limiting wall, and the second limiting body can be set between the limiting wall and the corresponding installation side wall. The limiting wall can limit the second limiting body, which can further reduce the risk of the third connecting body moving along the arrangement direction of the third connecting body and the corresponding installation side wall, thereby making the third connecting body more reliably fixed to the bracket body.

[0047] In some embodiments, there are three third connectors and three mounting sidewalls. The three mounting sidewalls include two first mounting sidewalls and one second mounting sidewall. The two first mounting sidewalls are opposite to each other and spaced apart along the second direction, and the second mounting sidewall is disposed near the outer end of the mounting portion along the first direction.

[0048] In the above technical solution, by having two first mounting sidewalls that are opposite to each other and spaced apart along the second direction, and the second mounting sidewalls that are located near the outer end of the mounting part along the first direction, multiple third connectors can be arranged on different sides of the insulating bracket, thereby connecting more sides of the insulating bracket to the encapsulation insulating film, making the encapsulation insulating film and the insulating bracket more reliably connected, further reducing the risk of separation between the encapsulation insulating film and the insulating bracket, and further facilitating the uniform stress distribution on the insulating bracket, which can further reduce the risk of deformation of the insulating bracket due to stress concentration.

[0049] In some embodiments, a second mounting groove is formed in the first mounting sidewall, and a corresponding third connector is assembled in the second mounting groove.

[0050] In the above technical solution, a corresponding third connector is assembled in the second mounting groove. The side wall of the second mounting groove can limit the corresponding third connector, which can reduce the risk of the third connector moving in the depth direction perpendicular to the second mounting groove. This is beneficial to improving the positional stability of the third connector, thereby reducing the risk of the third connector moving and separating from the encapsulation insulating film, and thus facilitating a reliable connection between the third connector and the encapsulation insulating film.

[0051] In some embodiments, the length of the third connector fixed to the first mounting sidewall along the first direction is L1, the length of the third connector fixed to the second mounting sidewall along the second direction is L2, the length of the second mounting sidewall along the second direction is L3, and the length of the second mounting groove along the first direction is L4, satisfying the relationship: 5mm≤L1=L2≤L3=L4.

[0052] In the above technical solution, by using 5mm≤L1=L2≤L3=L4, it is beneficial to ensure that the third connector meets the requirements of thermal fusion connection with the encapsulation insulating film, while also reducing the size of the third connector. This can further increase the installation area of ​​the support body, thereby further reducing the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0053] In some embodiments, the thickness of the third connector fixed to the first mounting sidewall along the second direction is W1, the thickness of the third connector fixed to the second mounting sidewall along the first direction is W2, the thickness of the second mounting sidewall along the first direction is W3, and the depth of the second mounting groove along the second direction is W4, satisfying the relationship: 0.6mm≤W1=W2≤W3=W4≤2mm.

[0054] In the above technical solution, by using 0.6mm≤W1=W2≤W3=W4≤2mm, it is more conducive to ensuring that the third connector meets the requirements of thermal fusion connection with the encapsulation insulating film, and it is also more conducive to reducing the size of the third connector. This can further increase the setting area of ​​the support body, thereby further reducing the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0055] In some embodiments, the distance between the outer sidewalls of the two first mounting sidewalls along the second direction is L5, and the distance between the outer sidewalls of the two third connectors fixed to the two first mounting sidewalls along the second direction is L6, satisfying the relationship: L5+0.1mm≤L6≤L5+0.5mm.

[0056] In the above technical solution, by using L5+0.1mm≤L6≤L5+0.5mm, the third connector can be made to meet the requirements of thermal fusion connection with the encapsulation insulating film, while also reducing the size of the third connector. This can further increase the installation area of ​​the support body, thereby further reducing the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0057] In some embodiments, the second sub-connection portion further includes a fourth connector, which is fixedly connected to a plurality of third connectors. Along the first direction, the end of the bracket body has a mounting portion, and the fourth connector is assembled to the mounting portion.

[0058] In the above technical solution, the fourth connector is fixedly connected to multiple third connectors, and the fourth connector is assembled in the mounting part. This helps to improve the overall structure of the second sub-connector, enhance the structural strength of the second sub-connector, reduce the risk of the third connector separating from the encapsulation insulating film due to deformation, and also helps to reliably fix the second sub-connector to the bracket body.

[0059] In some embodiments, the second sub-connecting portion further includes: a fourth connecting body, which is fixedly connected to a plurality of third connecting bodies. The fourth connecting body has a first connecting segment extending in a second direction, and the mounting portion has a third notch extending in the second direction. The first connecting segment is fitted into the third notch.

[0060] In the above technical solution, the installation part forms a third notch, and the first connecting section is assembled into the third notch. The fourth connecting body can be smoothly assembled into the bracket body, which is beneficial to improving the structural compactness of the insulating bracket. Furthermore, it can make the side wall of the first connecting section and the third notch contact and limit the movement of the second sub-connecting part relative to the bracket body in the first direction, which is beneficial to improving the positional stability of the second sub-connecting part, thereby making the second sub-connecting part reliably fixed to the bracket body.

[0061] In some embodiments, the width dimension of the first connecting segment along the first direction is less than or equal to the width dimension of the third notch along the first direction, the width dimension of the first connecting segment along the first direction is greater than or equal to 0.5 mm, and the width dimension of the third notch along the first direction is less than or equal to 2 mm.

[0062] In the above technical solution, by making the width of the first connecting segment less than or equal to the width of the third notch, and the width of the first connecting segment greater than or equal to 0.5mm, and the width of the third notch less than or equal to 2mm, the first connecting segment can be assembled on the basis of the third notch, which is more conducive to reducing the size of the second sub-connecting part, and can further increase the setting area of ​​the bracket body, thereby further reducing the risk of the insulating bracket melting and forming barbs that insert into the electrode assembly, further reducing the risk of thermal runaway of the entire battery device, and thus further improving the reliability of the battery cell and the battery device.

[0063] In some embodiments, the support body is formed with a storage groove that opens toward the end cap, and at least a portion of the storage groove and the connection are opposite each other along the arrangement direction of the insulating support and the end cap.

[0064] In the above technical solution, the support body forms a storage groove that opens towards the end cap. When the connection part and the encapsulation insulating film are thermally melted, the melted connection part can be stored in the storage groove, which further reduces the risk of the insulating support melting and forming barbs that insert into the electrode assembly, further reduces the risk of thermal runaway of the entire battery device, and thus is more conducive to improving the reliability of the battery cell and the battery device.

[0065] Secondly, embodiments of the present invention provide a battery device including the aforementioned battery cell.

[0066] Thirdly, embodiments of the present invention provide an electrical device, including the battery device described above.

[0067] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0068] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0069] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of the present invention;

[0070] Figure 2 This is an exploded schematic diagram of a battery device according to an embodiment of the present invention;

[0071] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of the present invention;

[0072] Figure 4 This is an exploded schematic diagram of a battery cell according to an embodiment of the present invention;

[0073] Figure 5 This is an exploded view of the insulating support according to the first embodiment of the present invention;

[0074] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0075] Figure 7 yes Figure 5 Enlarged view at point B in the middle;

[0076] Figure 8 This is a schematic diagram of an insulating bracket according to a first embodiment of the present invention;

[0077] Figure 9 yes Figure 8 Enlarged view at point C;

[0078] Figure 10 yes Figure 8 Enlarged view at point D;

[0079] Figure 11 This is an exploded view of the insulating support according to the second embodiment of the present invention;

[0080] Figure 12 yes Figure 11 Enlarged view at point E in the middle;

[0081] Figure 13 yes Figure 11 Enlarged view at point F;

[0082] Figure 14 This is a schematic diagram of an insulating bracket according to a second embodiment of the present invention;

[0083] Figure 15 yes Figure 14 Enlarged view at point G;

[0084] Figure 16 yes Figure 14Enlarged view at point H;

[0085] Figure 17 This is an exploded view of the insulating support according to the third embodiment of the present invention;

[0086] Figure 18 yes Figure 17 Enlarged view at point I;

[0087] Figure 19 This is a schematic diagram of an insulating bracket according to a third embodiment of the present invention;

[0088] Figure 20 yes Figure 19 Enlarged view of section J in the middle;

[0089] Figure 21 This is an exploded view of the insulating support according to the fourth embodiment of the present invention;

[0090] Figure 22 yes Figure 21 Enlarged view at point K;

[0091] Figure 23 This is a schematic diagram of an insulating bracket according to a fourth embodiment of the present invention;

[0092] Figure 24 yes Figure 23 Enlarged view at point M;

[0093] Figure 25 This is an exploded view of the insulating support according to the fifth embodiment of the present invention;

[0094] Figure 26 yes Figure 25 Enlarged view at point N;

[0095] Figure 27 This is a schematic diagram of an insulating bracket according to a fifth embodiment of the present invention;

[0096] Figure 28 yes Figure 27 Enlarged view at point P;

[0097] Figure 29 This is a schematic diagram of a support body having a storage groove formed according to an embodiment of the present invention;

[0098] Figure 30 yes Figure 29 Enlarged view of the middle Q section.

[0099] Figure label:

[0100] 100 for a single battery cell;

[0101] 10. Outer shell; 11. End cap; 12. Shell body;

[0102] Electrode assembly 20;

[0103] Insulating bracket 30;

[0104] Support body 31;

[0105] First mounting slot 311;

[0106] First sidewall 312; First notch 3121;

[0107] Mounting part 313; mounting side wall 3131; second mounting groove 3132; second notch 3133; limiting wall 3134; first mounting side wall 3135; second mounting side wall 3136; third notch 3137; groove bottom wall 3138; groove inner side wall 3139; groove outer side wall 31391; guide slope 31392;

[0108] Storage groove 314;

[0109] Connecting part 32; Sub-connecting part 321;

[0110] First sub-connector 322; First connector 3221; Second connector 3222;

[0111] Second sub-connector 323;

[0112] Third connector 3231;

[0113] Limiting body 3232; First limiting body 3233; Second limiting body 3234; Fourth connecting body 3235; First connecting segment 3236; Second connecting segment 3237;

[0114] Battery assembly 200; housing 201; first housing 202; second housing 203;

[0115] Vehicle 300; Controller 301; Motor 302. Detailed Implementation

[0116] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0117] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order or hierarchy.

[0118] In this invention, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0119] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0120] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, R and / or S can represent: R existing alone, R and S existing simultaneously, and S existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0121] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present invention shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on the present invention.

[0122] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0123] In this invention, "multiple" refers to two or more (including two).

[0124] The battery device mentioned in the embodiments of the present invention may include multiple battery cells, which are connected in series, parallel or mixed connection through a busbar component.

[0125] In some embodiments, the battery device includes a housing and a plurality of battery cells housed within the housing.

[0126] 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 mounting cavity inside the enclosure, which can accommodate multiple battery cells, i.e., multiple battery cells are installed in the mounting cavity. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The first enclosure may be one of the upper enclosure and the lower enclosure, and the second enclosure may be the other of the upper enclosure and the lower enclosure.

[0127] In this embodiment of the invention, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0128] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of the present invention are not limited to this.

[0129] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this embodiment of the invention is not limited to these shapes. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this embodiment of the invention is not limited to these types either.

[0130] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes beyond the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes beyond the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.

[0131] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of the present invention are not limited thereto.

[0132] In recent years, the vehicle industry has developed rapidly. Taking new energy vehicles as an example, the battery device, as a core component of the vehicle, plays an irreplaceable and important role.

[0133] In related technologies, a battery device contains individual battery cells, each with an insulating support (i.e., a lower plastic layer). This insulating support connects the end cap of the outer casing to an insulating film covering the outer side of the electrode assembly. Currently, the connection between the insulating support and the insulating film typically requires processing at high temperatures to achieve good adhesion and sealing between them. However, in the event of thermal runaway in the battery cell, the insulating support near the electrode assembly can easily melt due to the high temperature. The melted insulating support can then form barbs that insert into the electrode assembly, posing a short-circuit risk to the battery cell. This can easily lead to thermal runaway in the entire battery device, thus affecting the reliability of both the battery cell and the entire battery device.

[0134] Based on the above considerations, to address the issue of insulation support melting caused by thermal runaway in individual battery cells, a battery cell was designed after in-depth research. The cell includes: a casing with end caps; an electrode structure housed within the casing, comprising electrode components and an encapsulating insulating film, with the encapsulating insulating film encapsulating the electrode components; and an insulating support housed within the casing and located between the end caps and the electrode structure, fixed to the end caps. The insulating support includes a support body and a connecting portion, the connecting portion being fixed to the support body and fixedly connected to the encapsulating insulating film. The melting point of the support body is higher than that of the connecting portion. The connecting portion and the encapsulating insulating film are connected via thermal fusion, meeting the connection requirements between the insulating support and the encapsulating insulating film. Furthermore, the higher melting point of the support body, coupled with its high-temperature resistance, allows for a significant increase in the amount of high-temperature resistant material used in the insulating support, improving its high-temperature resistance and reducing the risk of melting due to high temperatures. This reduces the risk of barbs forming from the melting insulating support and inserting into the electrode components, thus lowering the risk of thermal runaway in the entire battery device and ultimately improving the reliability of both the individual battery cell and the entire battery device.

[0135] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 300 provided in some embodiments of the present invention. The vehicle 300 can be a gasoline-powered vehicle or a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. A battery device 200 is mounted on the chassis of the vehicle 300. The battery device 200 can be used to power the vehicle 300 and can serve as the operating power source for the vehicle 300. The vehicle 300 may also include a controller 301 and a motor 302. The controller 301 controls the battery device 200 to supply power to the motor 302 for the vehicle 300's starting, navigation, and driving power needs.

[0136] In some embodiments of the present invention, the battery device 200 can not only serve as the operating power source for the vehicle 300, but also as the driving power source for the vehicle 300, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 300.

[0137] The following is for reference. Figures 3-30 A battery cell 100 according to an embodiment of the present invention is described.

[0138] like Figures 3-30 As shown, the battery cell 100 according to an embodiment of the present invention includes: a housing 10, the housing 10 having an end cap 11;

[0139] An electrode structure is disposed within the outer casing 10. The electrode structure includes an electrode assembly 20 and an encapsulating insulating film, with the encapsulating insulating film encapsulating the electrode assembly 20. An insulating support 30 is disposed within the outer casing 10 and located between the end cap 11 and the electrode structure. The insulating support 30 is fixed to the end cap 11 and includes a support body 31 and a connecting portion 32. The connecting portion 32 is fixed to the support body 31 and fixedly connected to the encapsulating insulating film. The melting point of the support body 31 is higher than the melting point of the connecting portion 32. The connecting portion 32 includes multiple sub-connecting portions 321, which are arranged at different positions on the support body 31 and are all fixedly connected to the encapsulating insulating film. Multiple sub-connecting portions 321 are arranged sequentially at intervals along a first direction, which is perpendicular to the arrangement direction of the insulating support 30 and the end cap 11. The multiple sub-connecting portions 321 include: a first sub-connecting portion 322, which includes: a first connecting body 3221. Along a second direction, at least one side of the support body 31 is provided with the first connecting body 3221. The first connecting body 3221 is fixedly connected to the encapsulation insulating film. The first direction and the second direction are perpendicular, and the second direction is also perpendicular to the arrangement direction of the insulating support 30 and the end cap 11. Along the second direction, the support body 31 is provided with a first mounting groove 311 on the side of the first connecting body 3221. The first connecting body 3221 is assembled in the first mounting groove 311.

[0140] The battery cell 100 includes a casing 10, an electrode structure, and an insulating support 30. The casing 10 has a main body 12 and an end cap 11, which are fixedly connected to define a closed installation space. The electrode structure is located within the installation space of the casing 10 and includes an electrode assembly 20 and an encapsulating insulating film. The encapsulating insulating film is made of insulating material and encapsulates the electrode assembly 20; in other words, the encapsulating insulating film covers the electrode assembly 20. The electrode structure and the end cap 11 can be arranged along a third direction. This invention is illustrated using an example of the electrode structure and end cap 11 arranged along a third direction. Figure 4 As shown, the third party is Figure 4 The Z direction in the equation.

[0141] The insulating bracket 30 is located inside the housing 10, between the end cover 11 and the electrode structure, and is fixed to the end cover 11. The insulating bracket 30 can be glued to the end cover 11, snapped to the end cover 11, or fixed to the end cover 11 by bolts.

[0142] like Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25As shown, the insulating support 30 includes a support body 31 and a connecting part 32. Both the support body 31 and the connecting part 32 are made of insulating material. The connecting part 32 is fixed to the support body 31. As one example, the connecting part 32 can be integrally formed with the support body 31. As another example, the connecting part 32 and the support body 31 are separate parts. The connecting part 32 and the support body 31 are formed separately first, and then the connecting part 32 and the support body 31 are fixedly connected. The connecting part 32 is fixedly connected to the encapsulating insulating film by heat fusion. The melting point of the support body 31 is higher than that of the connecting part 32. The material of the connecting part 32 can be polypropylene, etc. The connecting part 32 has a relatively lower melting point than the support body 31, making it easier to heat fuse. This facilitates the heat fusion connection between the insulating support 30 and the encapsulating insulating film, thereby meeting the connection requirements between the insulating support 30 and the encapsulating insulating film. The electrode assembly 20 is fixed to the end cap 11 by the encapsulating insulating film.

[0143] The support body 31 can be made of polyethylene terephthalate, polyimide, etc. Compared with the connecting part 32, the support body 31 has a relatively high melting point and is not easy to melt. When the connecting part 32 is thermally fused with the encapsulation insulating film, the risk of the support body 31 melting and forming barbs is reduced. In addition, in the event of thermal runaway of the battery cell 100, compared with the prior art, the support body 31 is not easy to melt. The support body 31 can effectively reduce the high temperature transfer of the battery cell 100, which can reduce the risk of the insulating support 30 melting due to high temperature, thereby reducing the risk of the insulating support 30 melting and forming barbs that are inserted into the electrode assembly 20, reducing the risk of thermal runaway of the entire battery device 200, and thus helping to improve the reliability of the battery cell 100 and the battery device 200.

[0144] In the above technical solution, by setting a support body 31 and a connecting part 32, the connecting part 32 is connected to the encapsulation insulating film by heat fusion, which meets the connection requirements between the insulating support 30 and the encapsulation insulating film. Furthermore, the melting point of the support body 31 is higher than that of the connecting part 32. The support body 31 is resistant to high temperature, which can significantly increase the amount of high temperature resistant material used in the insulating support 30. This is beneficial to improving the high temperature resistance of the insulating support 30, reducing the risk of the insulating support 30 melting due to high temperature, thereby reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, reducing the risk of thermal runaway of the entire battery device 200, and thus improving the reliability of the battery cell 100 and the battery device 200.

[0145] The connecting portion 32 may include multiple sub-connecting portions 321. The number of sub-connecting portions 321 can be two, three, four, five, etc., and the number can be reasonably selected according to actual conditions, as long as it meets the installation requirements of the insulating bracket 30 and the encapsulating insulating film. This invention uses three sub-connecting portions 321 as an example for illustration. The multiple sub-connecting portions 321 are arranged at different positions on the bracket body 31; in other words, the multiple sub-connecting portions 321 are arranged in different areas of the bracket body 31. All multiple sub-connecting portions 321 are fixedly connected to the encapsulating insulating film by heat fusion.

[0146] In the above technical solution, multiple sub-connecting parts 321 are provided, which enables multiple different positions of the insulating bracket 30 to be connected to the encapsulating insulating film. This helps to ensure that the insulating bracket 30 is subjected to uniform force, reduces the risk of deformation of the insulating bracket 30 due to stress concentration, and thus helps to maintain the working reliability of the insulating bracket 30.

[0147] like Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25 As shown, multiple sub-connecting parts 321 are arranged sequentially at intervals along a first direction, which is perpendicular to the arrangement direction of the insulating bracket 30 and the end cap 11.

[0148] The first direction is Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25 In the X direction, in other words, the first direction is the length direction of the insulating bracket 30. The insulating bracket 30 extends along the first direction, which is perpendicular to the third direction. Multiple sub-connecting parts 321 can be evenly arranged along the first direction.

[0149] In the above technical solution, by arranging multiple sub-connecting parts 321 sequentially at intervals along the first direction, the multiple sub-connecting parts 321 can be arranged at intervals along the length direction of the insulating support 30, making the position arrangement of the multiple sub-connecting parts 321 reasonable, which is more conducive to the uniform stress on the insulating support 30, and can further reduce the risk of deformation of the insulating support 30 due to stress concentration, thereby making it more conducive to maintaining the working reliability of the insulating support 30.

[0150] like Figure 5 , Figure 6 , Figure 9 , Figure 11 , Figure 12 , Figure 15 , Figure 17 , Figure 21 and Figure 25As shown, the plurality of sub-connection portions 321 include: a first sub-connection portion 322, the first sub-connection portion 322 including: a first connector 3221, along the second direction, at least one side of the bracket body 31 is provided with the first connector 3221, the first connector 3221 is fixedly connected to the encapsulation insulating film, the first direction and the second direction are perpendicular, and the second direction is also perpendicular to the arrangement direction of the insulating bracket 30 and the end cap 11.

[0151] The plurality of sub-connecting portions 321 may include a first sub-connecting portion 322. At least one first sub-connecting portion 322 may be provided; this invention will be described using an example where one first sub-connecting portion 322 is provided. As an example, the first sub-connecting portion 322 is located at an end position of the insulating support 30 along the first direction. As another example, the first sub-connecting portion 322 is located at a middle position of the insulating support 30 along the first direction, where the middle position of the insulating support 30 along the first direction refers to the position between the two ends of the insulating support 30 along the first direction. This invention will be described using an example where the first sub-connecting portion 322 is located at the exact center position of the insulating support 30 along the first direction.

[0152] The first sub-connecting part 322 may include: a first connecting body 3221, which may be a plate-like structure, and the second direction is... Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25 The second direction is the width direction of the insulating support 30, in other words, the Y direction. A first connector 3221 is provided on one side of the support body 31 along the second direction, or both sides of the support body 31 are provided with the first connector 3221. This invention will be described using the example of both sides of the support body 31 having the first connector 3221. The first connector 3221 is fixedly connected to the encapsulating insulating film, and the first, second, and third directions are perpendicular to each other.

[0153] In the above technical solution, the first connector 3221 is provided on at least one side of the support body 31 along the second direction, which enables the first connector 3221 to be fixedly connected to the encapsulation insulating film in the side, which facilitates the connection between the first sub-connection part 322 and the encapsulation insulating film, improves the connection efficiency between the encapsulation insulating film and the first sub-connection part 322, and is conducive to improving the assembly efficiency of the battery cell 100, thereby improving the production efficiency of the battery cell 100, and making the setting position of the first connector 3221 reasonable.

[0154] like Figure 6 As shown, along the second direction, the bracket body 31 has a first mounting groove 311 formed laterally on the first connector 3221, and the first connector 3221 is assembled in the first mounting groove 311.

[0155] Along the second direction, the bracket body 31 has a first mounting groove 311 formed laterally on the first connector 3221. The first mounting groove 311 is recessed into the bracket body 31 along the second direction. Each first mounting groove 311 is equipped with a first connector 3221. Part of the structure of the first connector 3221 is assembled in the corresponding first mounting groove 311, or the entire structure of the first connector 3221 is assembled in the corresponding first mounting groove 311.

[0156] In the above technical solution, by assembling the first connector 3221 into the first mounting groove 311, the sidewall of the first mounting groove 311 can limit the corresponding first connector 3221, which can reduce the risk of the first connector 3221 moving in a direction perpendicular to the second direction, which is conducive to improving the positional stability of the first connector 3221, thereby reducing the risk of the first connector 3221 separating from the encapsulation insulating film due to movement of the first connector 3221, and thus facilitating the reliable connection between the first connector 3221 and the encapsulation insulating film.

[0157] In some examples of the present invention, such as Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25 As shown, along the first direction, the two end sub-connecting parts 321 are located at the ends of the bracket body 31.

[0158] In this configuration, along the first direction, the two sub-connecting portions 321 at the ends are located at the two ends of the support body 31, and along the first direction, the outer edges of the sub-connecting portions 321 can be aligned with the end positions of the support body 31 on the corresponding sides.

[0159] In the above technical solution, by having two sub-connecting parts 321 located at the two ends of the support body 31, the end position of the insulating support 30 along the first direction can be fixedly connected to the end position of the encapsulating insulating film along the first direction. This is more conducive to the uniform stress on the insulating support 30, and can further reduce the risk of deformation of the insulating support 30 due to stress concentration. This is more conducive to maintaining the working reliability of the insulating support 30, and also conducive to the reliable connection between the insulating support 30 and the encapsulating insulating film.

[0160] In some examples of the present invention, such as Figure 9 As shown, the groove sidewall of the first mounting groove 311 may have a first inclined wall, the first inclined wall and the second direction form an angle, the circumferential side edge of the first connector 3221 may have a first inclined surface, the first inclined wall and the first inclined surface fit together and limit the first connector 3221 to move out of the first mounting groove 311 along the second direction, thereby making the first connector 3221 and the bracket body 31 reliably connected.

[0161] In some examples of the present invention, along the first direction, the length of the first connector 3221 is less than or equal to the length of the first mounting groove 311, and the length of the first connector 3221 is greater than or equal to 5 mm.

[0162] Wherein, along the first direction, the length of the first connecting body 3221 is L7, and the length of the first mounting groove 311 is L8, satisfying the relationship: 5mm≤L7≤L8. L7 can be a value of 5mm, 5.5mm, 6mm, 7mm, etc., and L8 can be a value of 5mm, 5.5mm, 6mm, 7mm, etc., as long as L7≤L8.

[0163] In the above technical solution, by ensuring that the length of the first connector 3221 is less than or equal to the length of the first mounting groove 311 and greater than or equal to 5mm, the first connector 3221 satisfies the requirement of thermal fusion connection with the encapsulation insulating film. This helps to reduce the size of the first connector 3221, which can further increase the installation area of ​​the bracket body 31. This can further reduce the risk of the insulating bracket 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0164] In some examples of the present invention, such as Figure 9 As shown, along the second direction, the thickness of the first connector 3221 is less than or equal to the depth of the first mounting groove 311, the thickness of the first connector 3221 is greater than or equal to 0.5 mm, and the depth of the first mounting groove 311 is less than or equal to 2 mm.

[0165] In the second direction, the thickness of the first connector 3221 is W5, and the depth of the first mounting groove 311 is W6, satisfying the relationship: 0.5mm≤W5≤W6≤2mm. W5 can be 0.5mm, 0.6mm, 0.65mm, 0.7mm, 1mm, 2mm, etc., and W6 can be 0.5mm, 0.6mm, 0.65mm, 0.7mm, 1mm, 2mm, etc., as long as the relationship: 0.5mm≤W5≤W6≤2mm is satisfied.

[0166] In the above technical solution, along the second direction, the thickness of the first connector 3221 is less than or equal to the depth of the first mounting groove 311, and the thickness of the first connector 3221 is greater than or equal to 0.5mm. This is beneficial for the first connector 3221 to meet the requirements of thermal fusion connection with the encapsulation insulating film, and also for reducing the size of the first connector 3221. This can further increase the setting area of ​​the bracket body 31, thereby further reducing the risk of the insulating bracket 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0167] In some examples of the present invention, such as Figure 9 As shown, there are multiple first connectors 3221, and along the second direction, multiple first connectors 3221 are respectively disposed on both sides of the support body 31.

[0168] The first connecting body 3221 can be configured in the form of two, three, four, five, or other numbers. At least one first connecting body 3221 is provided on each side of the support body 31 along the second direction. This invention will be illustrated using an example where two first connecting bodies 3221 are provided, and one first connecting body 3221 is provided on each side of the support body 31 along the second direction.

[0169] In the above technical solution, along the second direction, first connectors 3221 are provided on both sides of the support body 31, which enables the insulating support 30 to be connected to the encapsulation insulating film on both sides along the second direction. This is beneficial to increase the connection area between the encapsulation insulating film and the insulating support 30, thereby making the encapsulation insulating film and the insulating support 30 reliably connected, reducing the risk of separation between the encapsulation insulating film and the insulating support 30. Furthermore, it is more conducive to making the insulating support 30 bear force evenly, which can further reduce the risk of deformation of the insulating support 30 due to stress concentration.

[0170] In some examples of the present invention, such as Figure 12 , Figure 14 and Figure 15 As shown, the first sub-connecting part 322 further includes a second connecting body 3222. There are two first connecting bodies 3221. The second connecting body 3222 extends along the second direction and is connected between the two first connecting bodies 3221.

[0171] The first sub-connecting part 322 may further include a second connecting body 3222. There are two first connecting bodies 3221, one on each side of the support body 31 along the second direction. The second connecting body 3222 extends along the second direction and connects between the two first connecting bodies 3221. The second connecting body 3222 and the two first connecting bodies 3221 can be integrally formed, or the second connecting body 3222 can be bonded to the first connecting bodies 3221. At least one second connecting body 3222 may be provided; however, this invention uses two second connecting bodies 3222 as an example for illustration. The two second connecting bodies 3222 are arranged sequentially along the first direction.

[0172] In the above technical solution, the second connector 3222 is connected between the two first connectors 3221, which helps to improve the structural integrity of the first sub-connector 322, improve the structural strength of the first sub-connector 322, reduce the risk of the first connector 3221 separating from the encapsulation insulating film due to deformation of the first connector 3221, and also helps to reliably fix the first sub-connector 322 to the bracket body 31.

[0173] In some examples of the present invention, along the second direction, a first mounting groove 311 is formed on both sides of the bracket body 31, and two first connectors 3221 are respectively assembled into the first mounting groove 311 on the corresponding side.

[0174] In this embodiment, along the second direction, a first mounting groove 311 is formed on both sides of the bracket body 31. The first mounting groove 311 is recessed into the bracket body 31 along the second direction. A first mounting groove 311 can be formed on both sides of the bracket body 31. Two first connectors 3221 are respectively assembled into the first mounting groove 311 on the corresponding side. A first connector 3221 is assembled in each first mounting groove 311. Part of the structure of the first connector 3221 is assembled into the corresponding first mounting groove 311, or the entire structure of the first connector 3221 is assembled into the corresponding first mounting groove 311.

[0175] In the above technical solution, by assembling the first connector 3221 into the first mounting groove 311, the sidewall of the first mounting groove 311 can limit the corresponding first connector 3221, which can reduce the risk of the first connector 3221 moving in a direction perpendicular to the second direction, which is conducive to improving the positional stability of the first connector 3221, thereby reducing the risk of the first connector 3221 separating from the encapsulation insulating film due to movement of the first connector 3221, and thus facilitating the reliable connection between the first connector 3221 and the encapsulation insulating film.

[0176] In some examples of the present invention, such as Figure 12 and Figure 15As shown, the bracket body 31 has two first sidewalls 312, which are opposite to each other and spaced apart along the second direction. The first sidewalls 312 are formed with first mounting grooves 311, and the second connector 3222 passes through the two first sidewalls 312 along the second direction.

[0177] The support body 31 has two first sidewalls 312, which are arranged opposite to each other along a second direction and spaced apart along the second direction. A first mounting groove 311 is formed in each of the first sidewalls 312. Along the second direction, the first mounting groove 311 is formed on the outer side of each first sidewall 312 away from the other. After the first connector 3221 is assembled into the first mounting groove 311, it is positioned on the outer side of the support body 31 along the second direction, facilitating connection between the first connector 3221 and the encapsulating insulating film. A second connector 3222 extends along the second direction and passes through the two first sidewalls 312. This arrangement allows the second connector 3222 to be placed within the support body 31, making the structure of the support body 31 and the first sub-connector 322 more compact and reducing the volume of the insulating support 30.

[0178] In the above technical solution, a first mounting groove 311 is formed through the first sidewall 312. After the first connector 3221 is assembled into the first mounting groove 311, the first connector 3221 is placed inside the bracket body 31. This allows the first connector 3221 to be located on the outside of the bracket body 31 along the second direction, which facilitates the connection between the first connector 3221 and the encapsulation insulating film. Furthermore, by having the second connector 3222 pass through the two first sidewalls 312, the second connector 3222 can be placed inside the bracket body 31, making the structure of the bracket body 31 and the first sub-connection part 322 more compact, which is beneficial to reducing the volume of the insulating bracket 30.

[0179] In some examples of the present invention, such as Figure 12 and Figure 15 As shown, the first sidewall 312 has a first notch 3121, which penetrates the first sidewall 312 along the second direction, and the second connector 3222 passes through the first notch 3121 of the two first sidewalls 312.

[0180] The first sidewall 312 has a first notch 3121. The first notch 3121 penetrates the corresponding first sidewall 312 along the second direction. Along the third direction, the first notch 3121 extends from the end opposite to the electrode assembly 20 to the end of the first sidewall 312 facing the end cap 11, so that the end of the first notch 3121 facing the end cap 11 forms an open end. The second connector 3222 can be assembled from the open end of the first notch 3121 to the first notch 3121, so that the second connector 3222 passes through the first notch 3121 of the two first sidewalls 312.

[0181] In the above technical solution, a first notch 3121 is formed in the first sidewall 312, and the second connector 3222 passes through the first notch 3121 of the two first sidewalls 312, so that the second connector 3222 passes through the two first sidewalls 312 in the second direction, thereby reducing the risk of interference between the second connector 3222 and the support body 31, and the second connector 3222 can be smoothly assembled into the support body 31.

[0182] In some examples of the present invention, along the first direction, the width of the second connector 3222 is less than or equal to the width of the first notch 3121, and the width of the second connector 3222 is greater than or equal to 0.5 mm.

[0183] Among them, such as Figure 12 and Figure 15 As shown, the width of the second connector 3222 along the first direction is less than or equal to the width of the first notch 3121 along the first direction. In other words, the width of the second connector 3222 along the first direction is L9, and the width of the first notch 3121 along the first direction is L10, satisfying the relationship: 0.5mm≤L9≤L10.

[0184] L9 can be 0.5mm, 0.6mm, 0.7mm, 0.9mm, etc., and L10 can be 0.5mm, 0.6mm, 0.7mm, 0.9mm, etc., as long as L9 ≤ L10.

[0185] In the above technical solution, along the first direction, the width of the second connector 3222 is less than or equal to the width of the first notch 3121, and the width of the second connector 3222 is greater than or equal to 0.5mm. This allows the first connector 3221 to meet the requirements of thermal fusion connection with the encapsulation insulating film, which helps to reduce the size of the first sub-connector 322. This can further increase the installation area of ​​the support body 31, thereby further reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0186] In some examples of the present invention, such as Figure 12 and Figure 15 As shown, along the second direction, the length of the second connector 3222 minus the distance between the inner surfaces of the bottom walls of the two first mounting grooves 311 on both sides of the bracket body 31 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0187] The second connector 3222 has a length dimension L11 along the second direction, and the interval between the inner surfaces of the bottom walls of the two first mounting grooves 311 on both sides of the bracket body 31 is L12, satisfying the relationship: 0.1mm≤L11-L12≤0.5mm, where the values ​​of L11-L12 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0188] In the above technical solution, by subtracting the distance between the inner surfaces of the bottom walls of the two first mounting grooves 311 on both sides of the bracket body 31 from the length of the second connector 3222, the size of the first sub-connector 322 is reduced by more than 0.1 mm and less than or equal to 0.5 mm. This helps to further reduce the size of the first sub-connector 322 and further increase the installation area of ​​the bracket body 31. This further reduces the risk of the insulating bracket 30 melting and forming barbs that are inserted into the electrode assembly 20, further reduces the risk of thermal runaway of the entire battery device 200, and thus further improves the reliability of the battery cell 100 and the battery device 200.

[0189] In some examples of the present invention, such as Figure 5 , Figure 7 , Figure 10 , Figure 11 , Figure 13 , Figure 16 , Figure 17 , Figure 18 , Figure 20 , Figure 21 , Figure 25 and Figure 26 As shown, the plurality of sub-connection portions 321 include: a second sub-connection portion 323, along the first direction, the second sub-connection portion 323 is located at the end position of the support body 31, the second sub-connection portion 323 includes: a third connector 3231, along the direction perpendicular to the arrangement direction of the insulating support 30 and the end cap 11, at least one side of the support body 31 is provided with the third connector 3231, the third connector 3231 is fixedly connected to the encapsulation insulating film.

[0190] The plurality of sub-connecting portions 321 include: a second sub-connecting portion 323, and at least one second sub-connecting portion 323 is provided. This invention is described using two second sub-connecting portions 323 as an example. The two second sub-connecting portions 323 can be located at the two ends of the support body 31 along the first direction, and the first sub-connecting portion 322 can be located between the two second sub-connecting portions 323 along the first direction.

[0191] The second sub-connector 323 may include a third connector 3231. The third connector 3231 may be a plate-like structure. The third connector 3231 is provided on at least one side of the support body 31 along a direction perpendicular to the arrangement direction of the insulating support 30 and the end cap 11, i.e., along a third direction perpendicular to the third direction. The third connector 3231 is fixedly connected to the encapsulating insulating film. As an example, the third connector 3231 is provided on the outer side of the support body 31 along a first direction, and the third connector 3231 and the support body 31 are arranged along the first direction. As another example, the third connector 3231 is provided on at least one side of the support body 31 along a second direction. As yet another example, the third connector 3231 is provided laterally on the support body 31 along the first direction, and also on at least one side of the support body 31 along the second direction.

[0192] In the above technical solution, the second sub-connector 323 is located at the end of the bracket body 31 and along the direction perpendicular to the arrangement direction of the insulating bracket 30 and the end cap 11. At least one side of the bracket body 31 is provided with a third connector 3231, which enables the third connector 3231 to be fixedly connected to the encapsulation insulating film in the side. This facilitates the connection between the second sub-connector 323 and the encapsulation insulating film, improves the connection efficiency between the encapsulation insulating film and the second sub-connector 323, and is conducive to further improving the assembly efficiency of the battery cell 100. This is more conducive to improving the production efficiency of the battery cell 100, and makes the setting position of the third connector 3231 reasonable.

[0193] In some examples of the present invention, there are multiple third connectors 3231. Along the second direction, at least one side of the support body 31 is provided with a third connector 3231, and along the first direction, the corresponding end of the support body 31 is provided with a third connector 3231. The first direction and the second direction are perpendicular, and the second direction is also perpendicular to the arrangement direction of the insulating support 30 and the end cap 11.

[0194] Among them, such as Figure 10 , Figure 16 , Figure 20 , Figure 24 and Figure 28As shown, there are multiple third connectors 3231. The number of third connectors 3231 can be two, three, four, five, six, etc. This invention is illustrated using the example of a second sub-connecting portion 323 including three third connectors 3231. Exemplarily, along the second direction, one third connector 3231 is provided on each side of the support body 31, and along the first direction, one third connector 3231 is provided at the end position corresponding to the second sub-connecting portion 323.

[0195] In the above technical solution, by providing a third connector 3231 on at least one side of the support body 31 along the second direction, and by providing a third connector 3231 at the corresponding end of the support body 31 along the first direction, the insulating support 30 can be connected to the encapsulation insulating film in both the second and first directions. This is more conducive to increasing the connection area between the encapsulation insulating film and the insulating support 30, thereby making the encapsulation insulating film and the insulating support 30 more reliably connected, further reducing the risk of separation between the encapsulation insulating film and the insulating support 30. In addition, it is more conducive to making the insulating support 30 bear force evenly, which can further reduce the risk of deformation of the insulating support 30 due to stress concentration.

[0196] In some examples of the present invention, along the first direction, the end of the bracket body 31 has a mounting portion 313, the mounting portion 313 has a plurality of mounting sidewalls 3131, the plurality of mounting sidewalls 3131 and a plurality of third connectors 3231 correspond one-to-one, and the third connectors 3231 are fixed to the corresponding mounting sidewalls 3131.

[0197] Among them, such as Figure 10 , Figure 16 , Figure 20 , Figure 24 and Figure 28 As shown, along the first direction, the end of the bracket body 31 has a mounting portion 313 for mounting a second sub-connector 323. Exemplarily, along the first direction, both ends of the bracket body 31 have mounting portions 313, and each mounting portion 313 is fitted with a second sub-connector 323. The mounting portion 313 has multiple mounting sidewalls 3131, and the multiple mounting sidewalls 3131 and multiple third connectors 3231 are correspondingly arranged. One third connector 3231 is mounted on each mounting sidewall 3131 and is fixed to the corresponding mounting sidewall 3131. The third connector 3231 can be injection molded with the corresponding mounting sidewall 3131. The multiple mounting sidewalls 3131 can be arranged on different sides of the insulating bracket 30, and the mounting sidewalls 3131 and the corresponding third connectors 3231 can be arranged on the same side of the insulating bracket 30.

[0198] In the above technical solution, the third connector 3231 is fixed to the corresponding mounting side wall 3131. The mounting side wall 3131 can support the third connector 3231, which helps to improve the positional stability of the third connector 3231.

[0199] In some examples of the present invention, at least one mounting sidewall 3131 is formed with a second mounting groove 3132, and a corresponding third connector 3231 is assembled in the second mounting groove 3132.

[0200] For example, Figure 10 As shown, multiple mounting sidewalls 3131 are each formed with a second mounting groove 3132. As another example, such as... Figure 16 As shown, a portion of the mounting sidewalls 3131 have a second mounting groove 3132. The second mounting groove 3132 is formed on the outer side of the mounting sidewall 3131, and the first mounting groove 311 is recessed into the mounting sidewall 3131. A third connector 3231 is assembled in each second mounting groove 3132. Part of the structure of the third connector 3231 is assembled in the corresponding second mounting groove 3132, or the entire structure of the third connector 3231 is assembled in the corresponding second mounting groove 3132.

[0201] In the above technical solution, by assembling the third connector 3231 into the second mounting groove 3132, the sidewall of the second mounting groove 3132 can limit the corresponding third connector 3231, which can reduce the risk of the third connector 3231 moving in the depth direction perpendicular to the second mounting groove 3132, which is conducive to improving the positional stability of the third connector 3231, thereby reducing the risk of the third connector 3231 separating from the encapsulation insulating film due to movement, and thus facilitating the reliable connection between the third connector 3231 and the encapsulation insulating film.

[0202] In some examples of the present invention, the third connector 3231 is connected to the limiting body 3232. The limiting body 3232 includes a first limiting body 3233 and a second limiting body 3234. The second limiting body 3234 and the corresponding third connector 3231 are opposite to and spaced apart. The first limiting body 3233 is connected between the third connector 3231 and the second limiting body 3234. The mounting sidewall 3131 has a second notch 3133. The first limiting body 3233 passes through the second notch 3133. The second limiting body 3234 is located on the side of the corresponding mounting sidewall 3131 away from the corresponding third connector 3231, and the second limiting body 3234 is in contact with the surface of the mounting sidewall 3131 away from the corresponding third connector 3231.

[0203] Among them, such as Figure 16 , Figure 20 and Figure 24As shown, each third connector 3231 can be connected to a limiting body 3232, and the limiting body 3232 can be a plate-like structure. The third connector 3231 and the corresponding limiting body 3232 are fixedly connected. For example, the third connector 3231 and the corresponding limiting body 3232 can be integrally formed, or the third connector 3231 and the corresponding limiting body 3232 can be snap-fit ​​connected.

[0204] The limiting body 3232 includes a first limiting body 3233 and a second limiting body 3234. The second limiting body 3234 and the corresponding third connecting body 3231 are arranged opposite to each other and spaced apart along the arrangement direction of the third connecting body 3231 and the corresponding mounting sidewall 3131. Along the arrangement direction of the third connecting body 3231 and the corresponding mounting sidewall 3131, the first limiting body 3233 is located between the corresponding second limiting body 3234 and the corresponding third connecting body 3231, and the first limiting body 3233 is connected between the third connecting body 3231 and the second limiting body 3234. The mounting sidewall 3131 forms a second notch. The second notch 3133 extends through the corresponding mounting sidewall 3131 along the arrangement direction of the third connector 3231 and the corresponding mounting sidewall 3131. It extends along the third direction and from the end of the electrode assembly 20 to the end of the corresponding mounting sidewall 3131 facing the end cap 11, so that the end of the second notch 3133 facing the end cap 11 forms an open end. The first limiting body 3233 can be assembled from the open end of the second notch 3133 to the second notch 3133, so that the first limiting body 3233 passes through the second notch 3133 of the corresponding mounting sidewall 3131.

[0205] The second limiting body 3234 is located on the side of the corresponding mounting sidewall 3131 that is away from the corresponding third connector 3231, and the second limiting body 3234 and the mounting sidewall 3131 are in surface contact limiting with the surface of the third connector 3231 away from the surface of the third connector 3231, and the third connector 3231 and the mounting sidewall 3131 are in surface contact limiting with the surface of the second limiting body 3234 away from the surface of the third limiting body 3234.

[0206] In the above technical solution, by forming a second notch 3133 in the mounting sidewall 3131, the first limiting body 3233 passes through the corresponding second notch 3133, achieving the effect of the first limiting body 3233 passing through the corresponding mounting sidewall 3131, reducing the risk of interference between the first limiting body 3233 and the bracket body 31, and allowing the limiting body 3232 to be smoothly assembled into the bracket body 31. Furthermore, by having the second limiting body 3234 located on the side of the corresponding mounting sidewall 3131 away from the corresponding third connecting body 3231, the second limiting body 3234 can contact and limit the mounting sidewall 3131, and the third connecting body 3231 can also contact and limit the mounting sidewall 3131. This reduces the risk of the third connecting body 3231 moving along the arrangement direction of the third connecting body 3231 and the corresponding mounting sidewall 3131, thereby allowing the third connecting body 3231 to be reliably fixed to the bracket body 31.

[0207] In some examples of the present invention, the mounting part 313 has a limiting wall 3134, and at least one third connector 3231 is provided with a limiting wall 3134. The limiting wall 3134 is located on the side of the corresponding second limiting body 3234 away from the corresponding mounting side wall 3131, and the limiting wall 3134 and the second limiting body 3234 are in contact.

[0208] Among them, such as Figure 16 , Figure 20 and Figure 24 As shown, the mounting portion 313 has a limiting wall 3134, and at least one limiting wall 3134 is provided. At least one third connecting body 3231 is provided with a corresponding limiting wall 3134; in other words, at least one mounting side wall 3131 is provided with a corresponding limiting wall 3134. The limiting wall 3134 is located on the side of the corresponding second limiting body 3234 away from the corresponding mounting side wall 3131; in other words, the limiting wall 3134 is located on the inner side of the corresponding second limiting body 3234 away from the corresponding mounting side wall 3131. The limiting wall 3134 and the second limiting body 3234 contact and limit each other.

[0209] In the above technical solution, the mounting part 313 has a limiting wall 3134, and the second limiting body 3234 can be disposed between the limiting wall 3134 and the corresponding mounting side wall 3131. The limiting wall 3134 can limit the second limiting body 3234, which can further reduce the risk of the third connecting body 3231 moving along the arrangement direction of the third connecting body 3231 and the corresponding mounting side wall 3131, thereby making the third connecting body 3231 more reliably fixed to the bracket body 31.

[0210] In some examples of the present invention, there are three third connectors 3231 and three mounting sidewalls 3131. The three mounting sidewalls 3131 include two first mounting sidewalls 3135 and one second mounting sidewall 3136. The two first mounting sidewalls 3135 are opposite to each other and spaced apart along the second direction, and the second mounting sidewall 3136 is disposed along the first direction near the outer end of the mounting portion 313.

[0211] The number of third connectors 3231 and mounting sidewalls 3131 is three. The three mounting sidewalls 3131 include two first mounting sidewalls 3135 and one second mounting sidewall 3136. The two first mounting sidewalls 3135 are arranged opposite each other and spaced apart along the second direction. The second mounting sidewall 3136 can be arranged close to the outer end of the mounting part 313 along the first direction. Along the first direction, the second mounting sidewall 3136 can be spaced apart from the outer edge of the mounting part 313, thereby forming a space for mounting the corresponding third connectors 3231 on the outer side of the second mounting sidewall 3136 along the first direction.

[0212] In the above technical solution, by having two first mounting sidewalls 3135 facing each other and spaced apart along the second direction, and a second mounting sidewall 3136 arranged along the first direction near the outer end of the mounting part 313, multiple third connectors 3231 can be arranged on different sides of the insulating bracket 30, thereby connecting more sides of the insulating bracket 30 to the encapsulation insulating film, making the encapsulation insulating film and the insulating bracket 30 more reliably connected, further reducing the risk of separation between the encapsulation insulating film and the insulating bracket 30, and further facilitating the uniform stress distribution on the insulating bracket 30, which can further reduce the risk of deformation of the insulating bracket 30 due to stress concentration.

[0213] In some examples of the present invention, a second mounting groove 3132 is formed in the first mounting sidewall 3135, and a corresponding third connector 3231 is assembled in the second mounting groove 3132.

[0214] Among them, such as Figure 10 , Figure 16 , Figure 20 , Figure 24 and Figure 28 As shown, a second mounting groove 3132 is formed in the first mounting sidewall 3135. The second mounting groove 3132 is formed on the outside of the first mounting sidewall 3135. The first mounting groove 311 is recessed into the first mounting sidewall 3135. A third connector 3231 is assembled in each second mounting groove 3132. Part of the structure of the third connector 3231 is assembled in the corresponding second mounting groove 3132, or the entire structure of the third connector 3231 is assembled in the corresponding second mounting groove 3132.

[0215] In the above technical solution, a corresponding third connector 3231 is assembled in the second mounting groove 3132. The sidewall of the second mounting groove 3132 can limit the corresponding third connector 3231, which can reduce the risk of the third connector 3231 moving in the depth direction perpendicular to the second mounting groove 3132. This is beneficial to improving the positional stability of the third connector 3231, thereby reducing the risk of the third connector 3231 separating from the encapsulation insulating film due to movement, and thus facilitating a reliable connection between the third connector 3231 and the encapsulation insulating film.

[0216] In some examples of the present invention, the length of the third connector 3231 fixed to the first mounting sidewall 3135 along the first direction is L1, the length of the third connector 3231 fixed to the second mounting sidewall 3136 along the second direction is L2, the length of the second mounting sidewall 3136 along the second direction is L3, and the length of the second mounting groove 3132 along the first direction is L4, satisfying the relationship: 5mm≤L1=L2≤L3=L4.

[0217] Among them, such as Figure 26 and Figure 28 As shown, the length of the third connector 3231 fixed to the first mounting sidewall 3135 along the first direction is equal to the length of the third connector 3231 fixed to the second mounting sidewall 3136 along the second direction, and the length of the second mounting sidewall 3136 along the second direction is equal to the length of the second mounting groove 3132 along the first direction.

[0218] The length of the third connector 3231 fixed to the first mounting sidewall 3135 along the first direction is greater than or equal to 5mm. For example, the length of the third connector 3231 fixed to the first mounting sidewall 3135 along the first direction can be 5mm, 6mm, 7mm, 9mm, etc. The upper limit of the length of the third connector 3231 fixed to the first mounting sidewall 3135 along the first direction can be reasonably selected and set according to the actual situation.

[0219] The length of the third connector 3231 fixed to the second mounting sidewall 3136 along the second direction is greater than or equal to 5mm. For example, the length of the third connector 3231 fixed to the second mounting sidewall 3136 along the second direction can be 5mm, 6mm, 7mm, 9mm, etc. The upper limit of the length of the third connector 3231 fixed to the second mounting sidewall 3136 along the second direction can be reasonably selected and set according to the actual situation.

[0220] The length of the second mounting sidewall 3136 along the second direction is greater than or equal to 5mm. For example, the length of the second mounting sidewall 3136 along the second direction can be 5mm, 6mm, 7mm, 9mm, etc. The upper limit of the length of the second mounting sidewall 3136 along the second direction can be reasonably selected and set according to the actual situation.

[0221] The length of the second mounting groove 3132 along the first direction is greater than or equal to 5mm. For example, the length of the second mounting groove 3132 along the first direction can be 5mm, 6mm, 7mm, 9mm, etc. The upper limit of the length of the second mounting groove 3132 along the first direction can be reasonably selected and set according to the actual situation.

[0222] In the above technical solution, by using 5mm≤L1=L2≤L3=L4, it is beneficial to ensure that the third connector 3231 can meet the requirements of thermal fusion connection with the encapsulation insulating film, and it is also beneficial to reduce the size of the third connector 3231. This can further increase the setting area of ​​the support body 31, thereby further reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0223] In some examples of the present invention, the thickness dimension of the third connector 3231 fixed to the first mounting sidewall 3135 along the second direction is W1, the thickness dimension of the third connector 3231 fixed to the second mounting sidewall 3136 along the first direction is W2, the thickness dimension of the second mounting sidewall 3136 along the first direction is W3, and the depth dimension of the second mounting groove 3132 along the second direction is W4, satisfying the relationship: 0.6mm≤W1=W2≤W3=W4≤2mm.

[0224] Among them, such as Figure 26 and Figure 28 As shown, the thickness of the third connector 3231 fixed to the first mounting sidewall 3135 along the second direction is equal to the thickness of the third connector 3231 fixed to the second mounting sidewall 3136 along the first direction. The thickness of the second mounting sidewall 3136 along the first direction is equal to the depth of the second mounting groove 3132 along the second direction.

[0225] The thickness of the third connector 3231 fixed to the first mounting sidewall 3135 along the second direction is greater than or equal to 0.6 mm and less than or equal to 2 mm. For example, the thickness of the third connector 3231 fixed to the first mounting sidewall 3135 along the second direction can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.6 mm, 1.9 mm, 2 mm, etc.

[0226] The thickness of the third connector 3231 fixed to the second mounting sidewall 3136 along the first direction is greater than or equal to 0.6 mm and less than or equal to 2 mm. For example, the thickness of the third connector 3231 fixed to the second mounting sidewall 3136 along the first direction can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.6 mm, 1.9 mm, 2 mm, etc.

[0227] The thickness of the second mounting sidewall 3136 along the first direction is greater than or equal to 0.6 mm and less than or equal to 2 mm. For example, the thickness of the second mounting sidewall 3136 along the first direction can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.6 mm, 1.9 mm, 2 mm, etc.

[0228] The depth dimension of the second mounting groove 3132 along the second direction is greater than or equal to 0.6 mm and less than or equal to 2 mm. For example, the depth dimension of the second mounting groove 3132 along the second direction can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.6 mm, 1.9 mm, 2 mm, etc.

[0229] In the above technical solution, by using 0.6mm≤W1=W2≤W3=W4≤2mm, it is more conducive to ensuring that the third connector 3231 meets the requirements of thermal fusion connection with the encapsulation insulating film, and it is also more conducive to reducing the size of the third connector 3231. This can further increase the setting area of ​​the support body 31, thereby further reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0230] In some examples of the present invention, the distance between the outer sidewalls of the two first mounting sidewalls 3135 along the second direction is L5, and the distance between the outer sidewalls of the two third connectors 3231 fixed to the two first mounting sidewalls 3135 along the second direction is L6, satisfying the relationship: L5+0.1mm≤L6≤L5+0.5mm.

[0231] Among them, such as Figure 26 and Figure 28As shown, along the second direction, both first mounting sidewalls 3135 have outer sidewalls, and the distance between the outer sidewalls of the two first mounting sidewalls 3135 along the second direction is L5. The third connector 3231 fixed to the first mounting sidewalls 3135 has an outer sidewall, and the distance between the outer sidewalls of the two third connectors 3231 fixed to the two first mounting sidewalls 3135 along the second direction is L6. 0.1mm≤L6-L5≤0.5mm, and the value of L6-L5 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0232] In the above technical solution, by using L5+0.1mm≤L6≤L5+0.5mm, while ensuring that the third connector 3231 can be thermally fused with the encapsulated insulating film, it is more advantageous to reduce the size of the third connector 3231. This can further increase the installation area of ​​the support body 31, thereby further reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0233] In some examples of the present invention, the second sub-connecting part 323 further includes a fourth connecting body 3235, which is fixedly connected to a plurality of third connecting bodies 3231. Along the first direction, the end of the bracket body 31 has a mounting part 313, and the fourth connecting body 3235 is assembled to the mounting part 313.

[0234] Among them, such as Figure 20 , Figure 24 and Figure 28 As shown, the second sub-connecting part 323 may further include: a fourth connecting body 3235, which is fixedly connected to a plurality of third connecting bodies 3231. Exemplarily, the fourth connecting body 3235 and the third connecting bodies 3231 may be integrally formed, or the fourth connecting body 3235 and the third connecting bodies 3231 may be snap-fitted and fixedly connected, or the fourth connecting body 3235 and the third connecting bodies 3231 may be adhesively bonded and fixedly connected. Along the first direction, the end of the bracket body 31 has a mounting part 313, and the fourth connecting body 3235 is assembled to the mounting part 313. The fourth connecting body 3235 may be fixed to the mounting part 313. Exemplarily, the fourth connecting body 3235 may be integrally formed with the mounting part 313, or the fourth connecting body 3235 and the mounting part 313 may be snap-fitted and fixedly connected, or the fourth connecting body 3235 and the mounting part 313 may be adhesively bonded and fixedly connected.

[0235] The shape of the fourth connector 3235 can be reasonably selected and set according to the actual situation. For example... Figure 20As shown, the fourth connector 3235 can be U-shaped or similar U-shaped. The fourth connector 3235 is arranged along the circumferential edge of the mounting part 313. The fourth connector 3235 is fixedly connected to multiple third connectors 3231.

[0236] like Figure 24 As shown, the fourth connector 3235 has a first connecting segment 3236 and a second connecting segment 3237 connected together. The first connecting segment 3236 extends along a second direction, and the second connecting segment 3237 extends along a first direction. The first connecting segment 3236 is fixedly connected to two third connectors 3231 arranged along the second direction. Along the first direction, the first connecting segment 3236 is connected to the middle position of the corresponding third connector 3231. The second connecting segment 3237 is fixedly connected to a third connector 3231 located outside the insulating support 30 along the first direction.

[0237] like Figure 28 As shown, the fourth connector 3235 has a first connecting segment 3236 and a second connecting segment 3237 connected together. The first connecting segment 3236 extends along a second direction, and the second connecting segment 3237 extends along a first direction. The first connecting segment 3236 is fixedly connected to two third connectors 3231 arranged along the second direction. Along the first direction, the first connecting segment 3236 is connected to the end position of the corresponding third connector 3231. The second connecting segment 3237 is fixedly connected to a third connector 3231 located outside the insulating support 30 along the first direction.

[0238] In the above technical solution, the fourth connector 3235 is fixedly connected to multiple third connectors 3231, and the fourth connector 3235 is assembled on the mounting part 313. This is beneficial to improve the structural integrity of the second sub-connector 323, improve the structural strength of the second sub-connector 323, reduce the risk of the third connector 3231 separating from the encapsulation insulating film due to deformation of the third connector 3231, and also help to reliably fix the second sub-connector 323 to the bracket body 31.

[0239] In some examples of the present invention, the second sub-connecting portion 323 further includes: a fourth connecting body 3235, which is fixedly connected to a plurality of third connecting bodies 3231. The fourth connecting body 3235 has a first connecting segment 3236 extending in a second direction, and the mounting portion 313 is formed with a third notch 3137 extending in a second direction. The first connecting segment 3236 is fitted into the third notch 3137.

[0240] Among them, such as Figure 24 and Figure 28As shown, the second sub-connector 323 may further include a fourth connector 3235, which is fixedly connected to a plurality of third connectors 3231. Exemplarily, the fourth connector 3235 and the third connectors 3231 may be integrally formed, or they may be snap-fitted together, or they may be adhesively bonded together. The fourth connector 3235 has a first connecting segment 3236 extending along a second direction. The mounting portion 313 has a third notch 3137 extending along the second direction, and at least a portion of the first connecting segment 3236 is fitted into the third notch 3137.

[0241] like Figure 24 As shown, a third notch 3137 is formed in the limiting wall 3134 corresponding to the two first mounting sidewalls 3135. The third notch 3137 is formed at the end of the limiting wall 3134 facing the end cap 11, and the third notch 3137 is open toward the end cap 11. Figure 28 As shown, along the first direction, a third notch 3137 is formed on the side of the mounting portion 313 away from the third connector 3231. The third notch 3137 is formed at the end position of the mounting portion 313 facing the end cover 11 and is open toward the end cover 11.

[0242] In the above technical solution, the mounting part 313 forms a third notch 3137, and the first connecting section 3236 is assembled into the third notch 3137. The fourth connecting body 3235 can be smoothly assembled into the bracket body 31, which is beneficial to improving the structural compactness of the insulating bracket 30. In addition, it can make the side wall of the first connecting section 3236 and the third notch 3137 contact and limit the movement, which can reduce the risk of the second sub-connecting part 323 moving relative to the bracket body 31 in the first direction. This is beneficial to improving the positional stability of the second sub-connecting part 323, so that the second sub-connecting part 323 can be reliably fixed to the bracket body 31.

[0243] In some examples of the present invention, the width dimension of the first connecting segment 3236 along the first direction is less than or equal to the width dimension of the third notch 3137 along the first direction, the width dimension of the first connecting segment 3236 along the first direction is greater than or equal to 0.5 mm, and the width dimension of the third notch 3137 along the first direction is less than or equal to 2 mm.

[0244] Among them, such as Figure 24 and Figure 28As shown, the width of the first connecting segment 3236 along the first direction is less than or equal to the width of the third notch 3137 along the first direction. The width of the first connecting segment 3236 along the first direction is greater than or equal to 0.5mm and less than or equal to 2mm. The width of the first connecting segment 3236 along the first direction can be 0.5mm, 0.6mm, 0.1mm, 1.5mm, 2mm, etc. The width of the third notch 3137 along the first direction is greater than or equal to 0.5mm and less than or equal to 2mm. The width of the third notch 3137 along the first direction can be 0.5mm, 0.6mm, 0.1mm, 1.5mm, 2mm, etc.

[0245] In the above technical solution, by ensuring that the width of the first connecting segment 3236 is less than or equal to the width of the third notch 3137, and that the width of the first connecting segment 3236 is greater than or equal to 0.5 mm, and that the width of the third notch 3137 is less than or equal to 2 mm, the first connecting segment 3236 can be assembled on the basis of the third notch 3137. This is more conducive to reducing the size of the second sub-connecting part 323, and can further increase the setting area of ​​the bracket body 31. This can further reduce the risk of the insulating bracket 30 melting and forming barbs that are inserted into the electrode assembly 20, and further reduce the risk of thermal runaway of the entire battery device 200. This is more conducive to improving the reliability of the battery cell 100 and the battery device 200.

[0246] In some examples of the present invention, such as Figure 30 As shown, the support body 31 has a storage groove 314 that opens toward the end cap 11, and at least a portion of the storage groove 314 and the connecting portion 32 are opposite each other along the arrangement direction of the insulating support 30 and the end cap 11.

[0247] The support body 31 has a storage groove 314, which is open towards the end of the end cap 11. The storage groove 314 and a portion of the connecting portion 32 are arranged opposite each other along a third direction, or the entire storage groove 314 and the connecting portion 32 are arranged opposite each other along a third direction. Along the third direction, the connecting portion 32 is located on the side of the support body 31 facing the end cap 11. Exemplarily, the storage groove 314 and at least one sub-connecting portion 321 are arranged opposite each other along a third direction. This invention will be described using the example of one storage groove 314 and one sub-connecting portion 321 being arranged opposite each other along a third direction.

[0248] As an example, such as Figure 30As shown, the mounting portion 313 has a storage groove 314, and the third connector 3231 and the limiting body 3232 of the second sub-connecting portion 323 are correspondingly provided with storage grooves 314. The third connector 3231 and the limiting body 3232 are disposed opposite to the storage groove 314 along a third direction. As another example, the first connector 3221 of the first sub-connecting portion 322 is correspondingly provided with storage grooves 314, and the first connector 3221 is disposed opposite to the storage groove 314 along a third direction. As another example, the mounting portion 313 has a storage groove 314, and the third connector 3231 and the limiting body 3232 of the second sub-connecting portion 323 are correspondingly provided with storage grooves 314. The third connector 3231 and the limiting body 3232 are disposed opposite to the storage groove 314 along a third direction. The first connector 3221 of the first sub-connecting portion 322 is correspondingly provided with storage grooves 314, and the first connector 3221 is disposed opposite to the storage groove 314 along a third direction.

[0249] In the above technical solution, the support body 31 forms a storage groove 314 that opens toward the end cap 11. When the connecting part 32 and the encapsulation insulating film are thermally melted, the connecting part 32 can be stored in the storage groove 314 after melting. This further reduces the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0250] In some examples of the present invention, such as Figure 30 As shown, the installation part 313 with a storage groove 314 is used as an example for explanation. The storage groove 314 and the third connector 3231 are provided in a one-to-one correspondence. The installation part 313 includes a groove bottom wall 3138, a groove inner side wall 3139, and a groove outer side wall 31391. The groove inner side wall 3139 and the groove outer side wall 31391 are provided opposite to each other and spaced apart. The installation side wall 3131 is located on the side of the groove bottom wall 3138 facing the end cap 11 and is fixed to the groove bottom wall 3138. The limiting wall 3134 is constructed as the groove inner side wall 3139.

[0251] The thickness of the outer wall 31391 of the groove along the arrangement direction of the inner wall 3139 and the outer wall 31391 of the groove is greater than or equal to 1 mm. The thickness of the outer wall 31391 of the groove along the arrangement direction of the inner wall 3139 and the outer wall 31391 of the groove can be 1 mm, 1.5 mm, 2 mm, etc. The thickness of the outer wall 31391 of the groove along the arrangement direction of the inner wall 3139 and the outer wall 31391 of the groove can be reasonably selected and set according to the actual situation.

[0252] Along the arrangement direction of the inner sidewall 3139 and the outer sidewall 31391 of the groove, the mounting sidewall 3131 is spaced apart from both the inner sidewall 3139 and the outer sidewall 31391 of the groove. The spacing between the mounting sidewall 3131 and the outer sidewall 31391 of the groove is greater than or equal to 0.5 mm. The spacing between the mounting sidewall 3131 and the outer sidewall 31391 of the groove can be 0.5 mm, 1 mm, 2 mm, etc., and can be reasonably selected according to the actual situation. The thickness of the mounting sidewall 3131 along the arrangement direction of the inner sidewall 3139 and the outer sidewall 31391 of the groove can be greater than or equal to 0.5 mm. The thickness of the mounting sidewall 3131 can be 0.5 mm, 1 mm, 2 mm, etc., and can be reasonably selected according to the actual situation. The width of the second notch 3133 along the fourth direction can be greater than or equal to 0.5mm. The width of the second notch 3133 along the fourth direction can be 0.5mm, 1mm, 2mm, etc. The width of the second notch 3133 along the fourth direction can be reasonably selected and set according to the actual situation. The fourth direction is perpendicular to the third direction. Taking the mounting sidewall 3131 located on one side of the insulating bracket 30 along the second direction as an example, the fourth direction is the first direction.

[0253] The height dimension of the outer wall 31391 of the groove along the third direction is less than the height dimension of the inner wall 3139 of the groove along the third direction. The height dimension of the outer wall 31391 of the groove along the third direction is H1. The total height dimension of the inner wall 3139 and the bottom wall 3138 of the groove along the third direction is H2, satisfying the relationship: 0.5mm≤H1≤0.5H2. The value of H1 can be 0.5mm, 0.6mm, 0.7mm, 0.4H2, 0.5H2, etc. The thickness dimension of the bottom wall 3138 of the groove along the third direction is H3, satisfying the relationship: 0.5mm≤H3≤1mm. H3 can be 0.5mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0254] In the above technical solution, by limiting the size, it is more advantageous to reduce the size of the connecting part 32, which can further increase the setting area of ​​the bracket body 31. This can further reduce the risk of the insulating bracket 30 melting and forming barbs that are inserted into the electrode assembly 20, further reduce the risk of thermal runaway of the entire battery device 200, and thus further improve the reliability of the battery cell 100 and the battery device 200.

[0255] In some examples of the present invention, a flow guiding slope 31392 may be formed on the inner surface of the outer wall 31391 of the groove. Along a third direction, the flow guiding slope 31392 and the end face of the outer wall 31391 of the groove facing the end cap 11 are adjacent. From the bottom wall 3138 of the groove to the outer wall 31391 of the groove, the flow guiding slope 31392 is inclined away from the inner wall 3139 of the groove. By providing the flow guiding slope 31392, after the connecting part 32 melts, the melted connecting part 32 can flow into the storage groove 314 along the flow guiding slope 31392, reducing the risk of the melted connecting part 32 flowing to the outside of the insulating support 30, further reducing the risk of the insulating support 30 melting and forming barbs that insert into the electrode assembly 20, further reducing the risk of thermal runaway of the entire battery device 200, and thus further improving the reliability of the battery cell 100 and the battery device 200.

[0256] In some examples of the present invention, along the arrangement direction of the inner sidewall 3139 and the outer sidewall 31391 of the groove, the width of the end face of the outer sidewall 31391 facing the end cap 11 is greater than or equal to 0.5 mm and less than 1 mm. The width of the end face of the outer sidewall 31391 facing the end cap 11 can be 0.5 mm, 0.6 mm, 0.8 mm, 0.9 mm, etc. This arrangement is beneficial to allow the molten connecting part 32 to flow into the storage groove 314 along the guide slope 31392.

[0257] In some examples of the present invention, the bracket body 31 and the connecting part 32 can be injection molded separately and then fixedly connected. The bracket body 31 and the connecting part 32 can also be fixedly connected by adhesive. Separate injection molding of the bracket body 31 and the connecting part 32 can improve production efficiency. Furthermore, if defective products are found in the bracket body 31 and the connecting part 32, they can be replaced separately, thereby helping to reduce economic losses.

[0258] In some examples of the present invention, the support body 31 and the connecting part 32 can be integrally molded. The support body 31 is injection molded first, and then the connecting part 32 is injection molded at the corresponding position of the support body 31. This arrangement can make there no gap between the support body 31 and the connecting part 32, and the connection between the support body 31 and the connecting part 32 is reliable, reducing the risk of the connecting part 32 falling off the support body 31.

[0259] In some examples of the present invention, the structural shape of the sub-connector 321 can be circular, T-shaped, rhomboid, elliptical, irregular, etc.

[0260] In some examples of the present invention, the support body 31 is made of insulating materials including, but not limited to, plastic, ceramic, glass, etc. The end cap 11 is made of materials including, but not limited to, aluminum, steel, aluminum-plastic film, plastic, or other materials resistant to electrolyte corrosion.

[0261] like Figure 2 As shown, the battery device 200 according to an embodiment of the present invention includes the battery cell 100 of the above embodiment.

[0262] The battery device 200 includes a housing 201, which may include a first housing 202 and a second housing 203. The first housing 202 and the second housing 203 are fastened together, forming a mounting cavity inside the housing 201. The mounting cavity can accommodate individual battery cells 100, which are installed within the mounting cavity. The first housing 202 can be one of an upper housing or a lower housing, and the second housing 203 can be the other of an upper housing or a lower housing. This invention is described using the second housing 203 as the lower housing as an example. Installing the individual battery cells 100 within the housing 201 reduces the risk of thermal runaway in the entire battery device 200, thereby improving the reliability of the battery device 200.

[0263] In some examples of the present invention, the surface of the bracket body 31 facing the end cap 11 and the surface of the connecting part 32 facing the end cap 11 are flush. In other words, the surface of the bracket body 31 facing the end cap 11 and the surface of the connecting part 32 facing the end cap 11 are coplanar. This arrangement can make the surface of the insulating bracket 30 facing the end cap 11 flat, which is beneficial to the reliable connection between the insulating bracket 30 and the end cap 11.

[0264] like Figure 2 As shown, the electrical device according to an embodiment of the present invention includes the battery device 200 of the above embodiment. The battery device 200 is mounted on the electrical device, which helps to improve the operational reliability of the electrical device.

[0265] According to some embodiments of the present invention, see Figure 4 , Figure 5 , Figure 11 , Figure 17 , Figure 21 and Figure 25As shown, the present invention provides a battery cell 100, which includes a housing 10, an electrode structure, and an insulating support 30. The housing 10 has an end cap 11. The electrode structure is disposed within the housing 10 and includes an electrode assembly 20 and an encapsulating insulating film, with the encapsulating insulating film encapsulating the electrode assembly 20. The insulating support 30 is disposed within the housing 10 and located between the end cap 11 and the electrode structure, and is fixed to the end cap 11. The insulating support 30 includes a support body 31 and a plurality of connecting portions 32. The plurality of connecting portions 32 are all fixed to the support body 31 and fixedly connected to the encapsulating insulating film. The melting point of the support body 31 is higher than the melting point of the connecting portions 32. The plurality of connecting portions 32 are arranged sequentially at intervals along a first direction. Along the first direction, two end sub-connecting portions 321 are respectively located at corresponding end positions of the support body 31. The support body 31 forms a storage groove 314 that opens toward the end cap 11. At least a portion of the storage groove 314 and the connecting portions 32 are opposite to each other along the arrangement direction of the insulating support 30 and the end cap 11.

[0266] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0267] Other configurations of the battery device 200 according to embodiments of the present invention, such as heat exchange structures and electrical connection structures, as well as its operation, are known to those skilled in the art and will not be described in detail here.

[0268] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0269] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: A housing having end caps; An electrode structure is disposed within the housing, the electrode structure comprising an electrode assembly and an encapsulation insulating film, wherein the encapsulation insulating film encapsulates the electrode assembly; An insulating support is disposed within the housing and located between the end cap and the electrode structure, and the insulating support is fixed to the end cap. The insulating support includes a support body and a connecting part, the connecting part being fixed to the support body and fixedly connected to the encapsulation insulating film, wherein the melting point of the support body is higher than the melting point of the connecting part. The connecting part includes: a plurality of sub-connecting parts, the plurality of sub-connecting parts being arranged at different positions of the bracket body, and the plurality of sub-connecting parts being fixedly connected to the encapsulation insulating film; The plurality of sub-connecting portions are arranged sequentially at intervals along a first direction, the first direction being perpendicular to the arrangement direction of the insulating bracket and the end cap; The plurality of said sub-connecting portions include: a first sub-connecting portion, the first sub-connecting portion including: a first connecting body, the first connecting body is provided on at least one side of the bracket body along the second direction, the first connecting body is fixedly connected to the encapsulation insulating film, the first direction and the second direction are perpendicular, and the second direction is also perpendicular to the arrangement direction of the insulating bracket and the end cap; Along the second direction, the bracket body has a first mounting groove formed laterally on the side of the first connector, and the first connector is assembled in the first mounting groove; The plurality of sub-connecting portions further include: a second sub-connecting portion, along the first direction, the second sub-connecting portion being located at the end of the support body, the second sub-connecting portion including: a third connecting body, along a direction perpendicular to the arrangement direction of the insulating support and the end cap, the third connecting body being provided on at least one side of the support body, the third connecting body being fixedly connected to the encapsulation insulating film; There are multiple third connectors. Along the second direction, at least one side of the support body is provided with the third connector, and along the first direction, the corresponding end of the support body is provided with the third connector.

2. The battery cell according to claim 1, characterized in that, Along the first direction, the two end sub-connecting portions are respectively located at the end positions of the support body.

3. The battery cell according to claim 1, characterized in that, Along the first direction, the length of the first connector is less than or equal to the length of the first mounting groove, and the length of the first connector is greater than or equal to 5 mm.

4. The battery cell according to claim 1, characterized in that, Along the second direction, the thickness of the first connector is less than or equal to the depth of the first mounting groove, the thickness of the first connector is greater than or equal to 0.5 mm, and the depth of the first mounting groove is less than or equal to 2 mm.

5. The battery cell according to claim 1, characterized in that, There are multiple first connectors, and along the second direction, the multiple first connectors are respectively disposed on both sides of the support body.

6. The battery cell according to claim 5, characterized in that, The first sub-connecting part further includes: a second connecting body, wherein there are two first connecting bodies, the second connecting body extends along the second direction, and the second connecting body is connected between the two first connecting bodies.

7. The battery cell according to claim 6, characterized in that, Along the second direction, a first mounting groove is formed on both sides of the bracket body, and the two first connectors are respectively assembled into the first mounting groove on the corresponding side.

8. The battery cell according to claim 7, characterized in that, The bracket body has two first sidewalls, which are opposite to each other and spaced apart along the second direction. The first sidewalls are formed with the first mounting groove, and the second connector passes through the two first sidewalls along the second direction.

9. The battery cell according to claim 8, characterized in that, The first sidewall has a first notch, which penetrates the first sidewall along the second direction, and the second connector passes through the first notch of the two first sidewalls.

10. The battery cell according to claim 9, characterized in that, Along the first direction, the width of the second connector is less than or equal to the width of the first notch, and the width of the second connector is greater than or equal to 0.5 mm.

11. The battery cell according to claim 8, characterized in that, Along the second direction, the length dimension of the second connector minus the distance between the inner surfaces of the bottom walls of the two first mounting slots on both sides of the bracket body is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

12. The battery cell according to claim 11, characterized in that, Along the first direction, the end of the bracket body has a mounting portion, the mounting portion has multiple mounting sidewalls, the multiple mounting sidewalls and the multiple third connectors correspond one-to-one, and the third connectors are fixed to the corresponding mounting sidewalls.

13. The battery cell according to claim 12, characterized in that, At least one of the mounting sidewalls is formed with a second mounting groove, and the corresponding third connector is assembled in the second mounting groove.

14. The battery cell according to claim 12, characterized in that, The third connector is connected to a limiting body, which includes a first limiting body and a second limiting body. The second limiting body and the corresponding third connector are opposite to and spaced apart. The first limiting body is connected between the third connector and the second limiting body. The mounting sidewall has a second notch. The first limiting body passes through the second notch. The second limiting body is located on the side of the mounting sidewall opposite to the corresponding third connector, and the second limiting body and the surface of the mounting sidewall opposite to the corresponding third connector are in contact.

15. The battery cell according to claim 14, characterized in that, The mounting part has a limiting wall, and at least one of the third connecting bodies is provided with the limiting wall. The limiting wall is located on the side of the corresponding second limiting body away from the corresponding mounting side wall, and the limiting wall and the second limiting body are in contact.

16. The battery cell according to claim 12, characterized in that, There are three of the third connector and the three mounting sidewalls. The three mounting sidewalls include two first mounting sidewalls and one second mounting sidewall. The two first mounting sidewalls are opposite to each other and spaced apart along the second direction. The second mounting sidewall is disposed along the first direction near the outer end of the mounting part.

17. The battery cell according to claim 16, characterized in that, The first mounting sidewall has a second mounting groove, and the third connector is assembled in the second mounting groove.

18. The battery cell according to claim 17, characterized in that, The length of the third connector fixed to the first mounting sidewall along the first direction is L1, the length of the third connector fixed to the second mounting sidewall along the second direction is L2, the length of the second mounting sidewall along the second direction is L3, and the length of the second mounting groove along the first direction is L4, satisfying the relationship: 5mm≤L1=L2≤L3=L4.

19. The battery cell according to claim 17, characterized in that, The thickness of the third connector fixed to the first mounting sidewall along the second direction is W1, the thickness of the third connector fixed to the second mounting sidewall along the first direction is W2, the thickness of the second mounting sidewall along the first direction is W3, and the depth of the second mounting groove along the second direction is W4, satisfying the relationship: 0.6mm≤W1=W2≤W3=W4≤2mm.

20. The battery cell according to claim 16, characterized in that, The distance between the outer sidewalls of the two first mounting sidewalls along the second direction is L5, and the distance between the outer sidewalls of the two third connectors fixed to the two first mounting sidewalls along the second direction is L6, satisfying the relationship: L5+0.1mm≤L6≤L5+0.5mm.

21. The battery cell according to claim 1, characterized in that, The second sub-connecting part further includes a fourth connecting body, which is fixedly connected to a plurality of the third connecting bodies. Along the first direction, the end of the bracket body has a mounting part, and the fourth connecting body is assembled to the mounting part.

22. The battery cell according to claim 16, characterized in that, The second sub-connecting part further includes: a fourth connecting body, which is fixedly connected to a plurality of the third connecting bodies. The fourth connecting body has a first connecting segment extending along the second direction, and the mounting part has a third notch extending along the second direction. The first connecting segment is fitted into the third notch.

23. The battery cell according to claim 22, characterized in that, The width of the first connecting segment along the first direction is less than or equal to the width of the third notch along the first direction, the width of the first connecting segment along the first direction is greater than or equal to 0.5 mm, and the width of the third notch along the first direction is less than or equal to 2 mm.

24. The battery cell according to any one of claims 1-11, characterized in that, The main body of the support has a storage groove that opens toward the end cap, and at least a portion of the storage groove and the connecting portion are opposite each other along the arrangement direction of the insulating support and the end cap.

25. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-24.

26. An electrical appliance, characterized in that, Includes the battery device according to claim 25.

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