Battery cell, battery device, and electric device

Abstract

The application provides a battery cell, a battery device and a power utilization device. The battery cell comprises a housing, an electrode assembly, a first insulating member and a support member. The housing has a first wall; the electrode assembly is accommodated in the housing, and the electrode assembly comprises a main body and a first tab, the first tab being arranged at one end of the main body facing the first wall in a first direction. The first insulating member comprises an insulating body and an abutting portion, the insulating body being at least partially arranged between the first wall and the main body, and the insulating body has a first surface facing the main body in the first direction, the abutting portion being connected with the insulating body and at least partially protruding from the first surface, the abutting portion being oppositely arranged with the main body, and the abutting portion is arranged with the first tab in a second direction. The support member is arranged at the abutting portion and located at one side of the abutting portion facing the first tab in the second direction, and the support member is attached to the first surface. The stress concentration is dispersed through the support member, thereby improving the reliability of the battery cell.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. With the increasing demand for batteries, higher requirements are being placed on the reliability of individual battery cells. Therefore, improving the reliability of individual battery cells is a pressing issue that needs to be addressed in battery technology. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a first insulating member, and a support member. The casing has a first wall. The electrode assembly is housed within the casing and includes a main body and a first tab. The first tab is disposed at one end of the main body facing the first wall along a first direction. The first insulating member includes an insulating body and abutment portion. The insulating body is at least partially disposed between the first wall and the main body. Along the first direction, the insulating body has a first surface facing the main body. The abutment portion is connected to the insulating body and at least partially protrudes from the first surface. The abutment portion is disposed opposite to the main body. The abutment portion and the first tab are arranged along a second direction, which is perpendicular to the first direction. The support member is disposed on the abutment portion and located on the side of the abutment portion facing the first tab along the second direction. The support member is attached to the first surface.

[0006] In the above technical solution, since a support member is provided on the side of the abutment portion facing the first electrode tab along the second direction, and the support member is attached to the first surface, the concentrated stress generated at the connection between the abutment portion and the insulating body during the inward bending deformation of the abutment portion can be dispersed by the support member, thereby reducing the possibility of plastic deformation at the connection between the abutment portion and the insulating body, and further reducing the possibility of the abutment portion being inserted into the electrode assembly and causing damage to the electrode assembly, resulting in deformation of the positive electrode sheet and the negative electrode sheet, thereby reducing the risk of internal short circuit in the battery cell and improving the reliability of the battery cell.

[0007] In some embodiments, the support member contacts the first surface, and the support member is detachably connected to the abutment portion.

[0008] In the above technical solution, since the support member and the abutment are detachably connected, the support member can be securely connected to the abutment during installation and contact the support member with the first surface. This allows the support member to be firmly positioned between the first surface and the abutment, thereby dispersing the concentrated stress generated at the connection between the abutment and the insulating body during the inward bending deformation of the abutment. This reduces the possibility of plastic deformation at the connection between the abutment and the insulating body. At the same time, since the support member and the abutment are detachably connected, the support member can be quickly separated from the abutment during disassembly, facilitating the replacement of the support member.

[0009] In some embodiments, one of the support member and the abutment member is provided with a snap-fit ​​part, and the other is provided with a snap-fit ​​groove, wherein the snap-fit ​​part and the snap-fit ​​groove engage in a snap-fit ​​cooperation.

[0010] In the above technical solution, due to the structural characteristics of the snap-fit ​​part and the slot, when installing the support and the abutment, the support and the abutment can have a good bonding force, so that the connection between the support and the abutment is reliable. When disassembling the support, the support and the abutment can be quickly separated, which facilitates the replacement of the support.

[0011] In some embodiments, the card slot extends along a first direction.

[0012] In the above technical solution, by extending the slot along the first direction, the movement trajectory of the support can be moved along the first direction when the support is installed, which facilitates guiding the support to move towards the first surface along the first direction, thereby simplifying the fit accuracy between the support and other components during installation and improving the installation efficiency of the support.

[0013] In some embodiments, the support member is fixedly connected to the first surface and the support member is fixedly connected to the abutment portion.

[0014] In the above technical solution, by setting the support member to be fixedly connected to the first surface and the support member to be fixedly connected to the abutment, the connection between the support member and the insulating body and the connection between the support member and the abutment becomes more reliable, thereby enhancing the mechanical strength of the connection between the insulating body and the abutment, which is more conducive to the support member dispersing the concentrated stress generated at the connection between the abutment and the insulating body.

[0015] In some embodiments, the insulating body, the abutment, and the support are integrally formed.

[0016] In the above technical solution, by setting the insulating body, the abutment and the support to be integrally formed, the connection between the support and the abutment and the connection between the support and the insulating body becomes more reliable, thereby further enhancing the mechanical strength of the connection between the insulating body and the abutment, which further helps the support to disperse the concentrated stress generated at the connection between the abutment and the insulating body.

[0017] In some embodiments, along the second direction, the abutment has a second surface facing the first electrode tab, and the support has a third surface that connects the second surface and the first surface. The third surface is a sloping plane or an arc surface.

[0018] In the above technical solution, by setting the third surface of the support member as an inclined plane, the support member is triangular in shape, making the support member a structure that is not easily deformed, thereby better dispersing the concentrated stress generated at the connection between the abutment and the insulating body; by setting the third surface of the support member as an arc surface, the shape of the third surface is arc-shaped, so that the concentrated stress can be evenly distributed along the arc, thereby better dispersing the concentrated stress generated at the connection between the abutment and the insulating body.

[0019] In some embodiments, along the second direction, the abutment has a second surface facing the first electrode tab, and the support has a third surface, the third surface including a first inclined plane and a first arc surface, the first inclined plane being connected to the second surface, and the first arc surface being connected to the first inclined plane and the first surface.

[0020] In the above technical solution, by setting the third surface of the support member to be composed of a first inclined plane and a first arc surface, and limiting the position of the first arc surface to be located between the first surface and the first inclined plane, an arc transition zone is formed between the support member and the insulating body, thereby better dispersing the concentrated stress generated at the connection between the abutment part and the insulating body.

[0021] In some embodiments, along the first direction, the size of the support member is T1, and the size of the portion of the abutment protruding from the first surface is T2, where 1 / 2 ≤ T1 / T2 ≤ 1.

[0022] In the above technical solution, when T1 / T2≥1 / 2, the mechanical strength of the support is improved, which facilitates the distribution of concentrated stress generated at the connection between the support and the insulating body, and reduces the risk of the support bending relative to the insulating body; when T1 / T2≤1, the risk of the support protruding from the support along the first direction is reduced, which helps to reduce the risk of interference between the support and the electrode assembly; therefore, when 1 / 2≤T1 / T2≤1, it is possible to balance improving the mechanical strength of the support and reducing the risk of interference between the support and the electrode assembly.

[0023] In some embodiments, 1.5mm≤T1≤10mm, and / or 3mm≤T2≤10mm.

[0024] In the above technical solution, when T1 ≥ 1.5 mm, the strength of the support member can be improved, thereby enhancing the support effect of the support member on the abutment and the insulating body; when T1 ≤ 10 mm, the material usage of the support member can be reduced, saving material costs. Therefore, when 1.5 mm ≤ T1 ≤ 10 mm, both improving the strength of the support member and reducing the material usage of the support member can be considered, thus improving the support effect of the support member on the abutment and the insulating body while saving material costs. When T2 ≥ 3 mm, the strength of the abutment can be improved, thereby enhancing the support effect of the abutment on the electrode assembly and the first wall; when T2 ≤ 10 mm, the material usage of the abutment can be reduced, saving material costs. Therefore, when 1.5 mm ≤ T2 ≤ 10 mm, both improving the strength of the abutment and reducing the material usage of the abutment can be considered, thus improving the support effect of the abutment on the electrode assembly and the first wall while saving material costs.

[0025] In some embodiments, along a third direction, the size of the support member is W1, the size of the abutment is W2, 0.125≤W1 / W2≤1, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0026] In the above technical solution, when W1 / W2≥0.125, the support effect of the support member on the abutment and the insulating body can be improved, and the risk of the abutment collapsing towards the electrode assembly can be reduced; when W1 / W2≤1, the material used of the support member can be reduced, and the material cost of the support member can be reduced; therefore, when 0.125≤W1 / W2≤1, the risk of the abutment collapsing towards the electrode assembly and the material cost of the support member can be reduced at the same time.

[0027] In some embodiments, 1.25mm≤W1≤100mm, and / or 10mm≤W2≤100mm.

[0028] In the above technical solution, when W1 ≥ 1.25 mm, the strength of the support member can be increased, thereby improving the support effect of the support member on the abutment and the insulating body; when W1 ≤ 100 mm, the material usage of the support member can be reduced, saving material costs. Therefore, when 1.25 mm ≤ W1 ≤ 100 mm, both increasing the strength of the support member and reducing the material usage of the support member can be considered, improving the support effect of the support member on the abutment and the insulating body while saving material costs. When W2 ≥ 10 mm, the strength of the abutment can be increased, thereby improving the support effect of the abutment on the electrode assembly and the first wall; when W2 ≤ 100 mm, the material usage of the abutment can be reduced, saving material costs. Therefore, when 10 mm ≤ W2 ≤ 100 mm, both increasing the strength of the abutment and reducing the material usage of the abutment can be considered, improving the support effect of the abutment on the electrode assembly and the first wall while saving material costs.

[0029] In some embodiments, the abutment portion is provided with an exhaust channel, which extends through the abutment portion along the second direction.

[0030] In the above technical solution, by providing an exhaust channel that runs through the abutment in the second direction, the gas can quickly pass through the abutment when it flows through it, reducing the obstruction of the abutment to the gas flow and thus facilitating the flow of gas.

[0031] In some embodiments, the abutment portion is provided with a plurality of exhaust channels, which are arranged along a third direction. The abutment portion includes at least one partition wall, each partition wall separating two adjacent exhaust channels. The at least one partition wall is provided with a support member, which is perpendicular to each other in the first direction, the second direction and the third direction.

[0032] In the above technical solution, multiple exhaust channels are provided in the abutment part, and the multiple exhaust channels are arranged along the third direction, so that there are multiple positions for gas flow on the abutment part, which is conducive to the gas passing through the abutment part and improves the gas passage efficiency; by setting a partition wall to separate two adjacent exhaust channels, and setting a support member on the partition wall, the installation position of the support member can help reduce the obstruction of the gas flow path in the exhaust channel and improve the gas passage efficiency.

[0033] In some embodiments, along the first direction, the abutment portion further includes an end wall, which is closer to the main body portion than the first surface. A partition wall is located on the side of the end wall away from the main body portion and is connected to the end wall. A portion of the support member is disposed on the partition wall, and another portion of the support member is disposed on the end wall.

[0034] In the above technical solution, by setting the abutment part to include an end wall, and setting a part of the support member on the partition wall and another part of the support member on the end wall, there are more connection positions between the support member and the abutment part, so that the connection between the support member and the abutment part becomes more reliable, which is more conducive to the support member dispersing the concentrated stress generated at the connection between the abutment part and the insulating body.

[0035] In some embodiments, the abutment portion further includes two sidewalls disposed opposite each other along a third direction. Along the third direction, all partition walls are located between the two sidewalls, and each sidewall forms an exhaust channel with the partition wall closest to the sidewall. At least one sidewall is provided with a support.

[0036] In the above technical solution, by setting the abutment part to also include a side wall, and setting the side wall to provide a support member, the position of the side wall of the abutment part can be fully utilized to install the support member, thereby further increasing the number of support members, which is more conducive to the support members dispersing the concentrated stress generated at the connection between the abutment part and the insulating body.

[0037] In some embodiments, the abutment includes a plurality of partition walls, which are spaced apart along a third direction, and each partition wall is provided with a support member.

[0038] In the above technical solution, by setting support members on each partition wall and setting multiple partition walls at intervals along a third direction, the multiple support members are set at intervals along a third direction, so that the path of concentrated stress transmission on the support members is continuous, which further facilitates the dispersion of concentrated stress between the abutment part and the connection of the insulating body.

[0039] In some embodiments, along a third direction, the partition wall has opposing fourth and fifth surfaces, and along the direction from the fourth surface to the fifth surface, the support does not extend beyond the fifth surface, and along the direction from the fifth surface to the fourth surface, the support does not extend beyond the fourth surface.

[0040] In the above technical solution, by setting the support member in the direction from the fourth surface to the fifth surface without extending beyond the fifth surface, and in the direction from the fifth surface to the fourth surface without extending beyond the fourth surface, the two sides of the support member will not extend beyond the two sides of the partition wall along the third direction. This allows the installation position of the support member to reduce obstruction of the gas flow path in the exhaust channel and improve the gas passage efficiency.

[0041] In some embodiments, the support member disposed on the partition wall is a first support member, at least one first support member is provided with a first through hole, at least one partition wall is provided with a second through hole, the first through hole penetrates the first support member along the second direction, the second through hole penetrates the partition wall, and the first through hole and the second through hole are connected.

[0042] In the above technical solution, by providing a first through hole on the first support member and a second through hole on the partition wall, and by connecting the first through hole and the second through hole, multiple gas flow channels are formed between the first support member and the partition wall, thereby providing multiple gas flow positions on the first support member and the partition wall, thus improving the gas flow efficiency.

[0043] In some embodiments, the diameter of the first through hole is D1, 0.1mm≤D1≤0.3mm; and / or the diameter of the second through hole is D2, 0.1mm≤D2≤0.3mm.

[0044] In the above technical solution, by setting D1 ≥ 0.1 mm, the size of the first through hole is made convenient for gas passage, thereby further improving the gas passage efficiency; by setting D1 ≤ 0.3 mm, the size of the first through hole is not too large, thus affecting the structural strength of the first support member. By setting D2 ≥ 0.1 mm, the size of the second through hole is made convenient for gas passage, thereby further improving the gas passage efficiency; by setting D2 ≤ 0.3 mm, the size of the second through hole is not too large, thus affecting the structural strength of the partition wall.

[0045] In some embodiments, at least one first support member is provided with a plurality of first through holes, the minimum distance between the central axes of two adjacent first through holes is L1, 1.5mm≤L1≤2mm; and / or at least one partition wall is provided with a plurality of second through holes, the minimum distance between the central axes of two adjacent second through holes is L2, 1.5mm≤L2≤2mm.

[0046] In the above technical solution, by setting L1 ≥ 1.5 mm, the distance between two adjacent first through holes is not too small, thereby reducing the possibility of interference between adjacent first through holes and thus affecting gas flow; by setting L1 ≤ 2 mm, the distance between two adjacent first through holes is not too large, thus allowing a relatively reasonable number of first through holes to be set on the first support member with limited dimensions, thereby creating more gas passage positions on the first support member and further improving gas passage efficiency. Similarly, by setting L2 ≥ 1.5 mm, the distance between two adjacent second through holes is not too small, thereby reducing the possibility of interference between adjacent second through holes and thus affecting gas flow; by setting L2 ≤ 2 mm, the distance between two adjacent second through holes is not too large, thus allowing a relatively reasonable number of second through holes to be set on the partition wall with limited dimensions, thereby creating more gas passage positions on the partition wall and further improving gas passage efficiency.

[0047] In some embodiments, the insulating body is connected to the first wall.

[0048] In the above technical solution, by connecting the insulating body to the first wall, the connection between the insulating body and the first wall is made reliable, thereby reducing the risk of the insulating body detaching from the first wall.

[0049] In some embodiments, the battery cell further includes a second insulating member, which covers the outer surface of the main body and is connected to the abutment portion.

[0050] In the above technical solution, by setting a second insulating member to cover the outer surface of the main body, insulation isolation between the electrode assembly and the housing is achieved. By setting the second insulating member to be connected to the abutment part, the connection between the second insulating member and the abutment part is made reliable, which helps the second insulating member to provide support for the electrode assembly.

[0051] Secondly, embodiments of this application provide a battery device, including a single battery cell provided in any one of the embodiments of the first aspect.

[0052] Thirdly, embodiments of this application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect or a battery device provided in any one of the embodiments of the second aspect. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0055] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0056] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0057] Figure 4 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0058] Figure 5 A schematic diagram of the structure of a first insulating member provided for some embodiments of this application (showing the slot and the snap-fit ​​portion);

[0059] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0060] Figure 7 A schematic diagram of the structure of a first insulating member provided for some embodiments of this application (showing the second and third surfaces);

[0061] Figure 8 for Figure 7 A magnified view of a portion of point B in the middle;

[0062] Figure 9 A schematic diagram of the structure of a first insulating member provided for other embodiments of this application (showing the second and third surfaces);

[0063] Figure 10 for Figure 9 A magnified view of a portion of point C in the middle;

[0064] Figure 11 A schematic diagram of the structure of a first insulating element provided for some embodiments of this application (showing a first inclined plane and a first arc surface);

[0065] Figure 12 for Figure 11 A magnified view of a portion of point D in the middle;

[0066] Figure 13 Exploded views of a battery cell provided in some embodiments of this application;

[0067] Figure 14 A schematic diagram of the structure of a first insulating member provided for some embodiments of this application (showing an exhaust channel);

[0068] Figure 15 for Figure 14 A magnified view of a portion of point E in the middle;

[0069] Figure 16 A schematic diagram of the structure of the first insulating element provided for other embodiments of this application (showing the exhaust channel);

[0070] Figure 17 A schematic diagram of the structure of a first insulating element provided for some embodiments of this application (showing a first through hole);

[0071] Figure 18 for Figure 17 F-F sectional view;

[0072] Figure 19 for Figure 17 A schematic diagram of the structure of the first support member and the first through hole;

[0073] Figure 20 This is a cross-sectional view of a battery cell (without the casing) provided in some embodiments of this application.

[0074] The reference numerals in the detailed embodiments are as follows:

[0075] 1000 - Vehicles;

[0076] 100 - Battery; 200 - Controller; 300 - Motor;

[0077] 10 - Battery cell; 1 - Outer casing; 11 - Housing; 12 - First wall; 13 - End cap; 2 - Electrode assembly; 21 - Main body; 22 - First tab; 3 - Electrode terminal; 4 - First insulating component; 41 - Insulating body; 411 - First surface; 42 - Abutting part; 421 - Slot; 422 - Second surface; 423 - Exhaust channel; 424 - Partition wall; 4241 - Fourth surface; 4242 - Fifth surface; 425 - End wall; 426 - Side wall; 427 - Second through hole; 5 - Support component; 51 - Snap-fit ​​part; 52 - Third surface; 521 - First inclined plane; 522 - First arc surface; 53 - First through hole; 54 - First support component; 6 - Second insulating component; 7 - Pressure relief mechanism; 71 - Pressure relief hole;

[0078] 20 – Box; 201 – First box; 202 – Second box;

[0079] X – First direction; Y – Second direction; Z – Third direction. Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0081] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0082] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0085] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0086] In this application, "multiple" means two or more (including two).

[0087] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0088] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0089] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0090] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0091] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0092] As an example, the positive electrode current collector can be a foil or a composite current collector. For example, as a foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 )), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0094] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0095] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0096] As an example, the negative electrode current collector can be a foil, a foamed metal, or a composite current collector. For example, as a foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, or titanium, etc. The foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0097] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0098] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0099] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0100] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0101] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0102] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0105] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0106] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0107] Among them, gel electrolytes include a polymer-based electrolyte backbone network combined with an ionic liquid—lithium salt.

[0108] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0109] As an example, polymer solid electrolytes can be polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0110] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0111] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0112] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0113] In some implementations, the electrode assembly is a stacked structure.

[0114] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0115] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0116] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0117] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0118] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0119] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0120] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0121] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0122] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0123] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0124] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0125] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0126] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cell assemblies housed within the housing.

[0127] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0128] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0129] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0130] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0131] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0132] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0133] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, higher demands are being placed on the reliability of individual battery cells.

[0134] To address the technical challenge of improving the reliability of individual battery cells, a common battery cell structure incorporates an insulating component between one wall of the casing and the electrode assembly. This insulating component, connected to the casing wall, includes an insulating body with abutment portions at both ends. These abutment portions face and abut against the electrode assembly, limiting its position and preventing internal short circuits caused by the electrode tabs moving and contacting the end cap. However, due to insufficient mechanical strength in the connection between the insulating body and the abutment portions, they are prone to bending and deforming inwards relative to the insulating body when subjected to external forces. This bending leads to stress concentration at the connection point, causing plastic deformation that can result in the abutment portion penetrating and damaging the electrode assembly. This, in turn, can cause internal short circuits between the positive and negative electrode plates, reducing the overall reliability of the battery cell.

[0135] Based on the above considerations, in order to solve the technical problem that insufficient mechanical strength at the connection between the insulating body and the abutment portion leads to bending deformation of the abutment portion, causing damage to the electrode assembly and thus reducing the reliability of the battery cell, this application provides a battery cell including a shell, an electrode assembly, a first insulating member, and a support member. The shell has a first wall; the electrode assembly is housed within the shell, and the electrode assembly includes a main body and a first tab, the first tab being disposed at one end of the main body facing the first wall along a first direction. The first insulating member includes an insulating body and an abutment portion, the insulating body being at least partially disposed between the first wall and the main body, the insulating body having a first surface facing the main body along the first direction, the abutment portion being connected to the insulating body and at least partially protruding from the first surface, the abutment portion being disposed opposite to the main body, and the abutment portion and the first tab being arranged along a second direction, the second direction being perpendicular to the first direction. The support member is disposed on the abutment portion and located on the side of the abutment portion facing the first tab along the second direction, the support member being attached to the first surface.

[0136] In this type of battery cell, a support member is provided and positioned within the abutment portion, on the side of the abutment portion facing the first electrode tab along the second direction Y. The support member is attached to the first surface, thereby enabling it to support the connection between the abutment portion and the insulating body. Specifically, when the abutment portion is subjected to tensile force and bends inward, the concentrated stress generated at the connection between the abutment portion and the insulating body during bending deformation can be dispersed by the support member. This reduces the possibility of plastic deformation at the connection between the abutment portion and the insulating body, thereby reducing the possibility of the abutment portion damaging the electrode assembly during insertion into the electrode assembly, leading to deformation of the positive and negative electrode sheets, and ultimately reducing the risk of internal short circuits within the battery cell. This improves the reliability of the battery cell.

[0137] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0138] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0139] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device is disposed inside the vehicle 1000, and the battery device may be located at the bottom, front, or rear of the vehicle 1000. The battery device can be used to power the vehicle 1000; for example, the battery device can serve as the operating power source for the vehicle 1000.

[0140] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0141] In some embodiments of this application, the battery device can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0142] Please refer to Figure 2 , Figure 2 The exploded view of a battery device provided in some embodiments of this application shows that the battery device may include a battery cell 10 and a housing 20 for accommodating the battery cell 10.

[0143] The housing 20 has an enclosed space inside for accommodating the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which are interlocked. The first housing 201 and the second housing 202 can have various shapes, such as cuboids or cylinders. The first housing 201 can be a hollow structure open on one side, and the second housing 202 can also be a hollow structure open on one side. The open side of the second housing 202 interlocks with the open side of the first housing 201, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 201 can be a hollow structure open on one side, and the second housing 202 can be a plate-like structure, with the second housing 202 interlocked with the open side of the first housing 201, thus forming a housing 20 with an enclosed space.

[0144] In a battery device, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the whole assembly of all battery cells 10 is housed within the housing 20.

[0145] In some embodiments, the battery device may further include a busbar component, through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0146] Please refer to Figure 3 and Figure 4 , Figure 3 Exploded views of a single battery cell provided in some embodiments of this application; Figure 4This is a schematic diagram of the structure of the first insulating member provided in some embodiments of this application. Embodiments of this application provide a battery cell 10, including a housing 1, an electrode assembly 2, a first insulating member 4, and a support member 5. The housing 1 has a first wall 12; the electrode assembly 2 is housed within the housing 1, and the electrode assembly 2 includes a main body 21 and a first tab 22. The first tab 22 is disposed at one end of the main body 21 facing the first wall 12 along a first direction X. The first insulating member 4 includes an insulating body 41 and abutting portion 42. The insulating body 41 is at least partially disposed between the first wall 12 and the main body 21. Along the first direction X, the insulating body 41 has a first surface 411 facing the main body 21. The abutting portion 42 is connected to the insulating body 41 and at least partially protrudes from the first surface 411. The abutting portion 42 is disposed opposite to the main body 21. The abutting portion 42 and the first tab 22 are arranged along a second direction Y, which is perpendicular to the first direction X. The support member 5 is disposed on the abutment portion 42 and is located on the side of the abutment portion 42 facing the first electrode tab 22 along the second direction Y. The support member 5 is attached to the first surface 411.

[0147] The housing 1 may include a housing 11 and an end cap 13. The housing 11 has an opening, and the end cap 13 closes the opening of the housing 11. Here, "closed" means covered or shut, and can be either sealed or unsealed.

[0148] The housing 11 is a component used to house the electrode assembly 2. The housing 11 can be a hollow structure with an opening at one end, or a hollow structure with openings at both opposite ends. The housing 11 can have various shapes, such as cylindrical or cuboid. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0149] The end cap 13 and the housing 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 13 can be connected to the housing 11 by welding, rolling, or other methods to close the opening of the housing 11. The shape of the end cap 13 can be adapted to the shape of the housing 11. For example, if the housing 11 is a cuboid structure, the end cap 13 can be a rectangular plate structure adapted to the housing 11; or if the housing 11 is a cylindrical structure, the end cap 13 can be a circular plate structure adapted to the housing 11. The end cap 13 can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The end cap 13 and the housing 11 can be made of the same or different materials.

[0150] In an embodiment where the housing 11 has an opening at one end, one end cap 13 may be provided accordingly. In an embodiment where the housing 11 has openings at both opposite ends, two end caps 13 may be provided accordingly, with the two end caps 13 respectively closing the two openings of the housing 11, and the two end caps 13 and the housing 11 together defining the receiving space.

[0151] The battery cell 10 may also include an electrode terminal 3, which is disposed on the housing 1. The electrode terminal 3 is used to electrically connect with the tabs of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminal 3 may be disposed on the housing 11 of the housing 1 or on the end cap 13 of the housing 1.

[0152] The first wall 12 can be an end cap 13, or it can be a wall of the housing 11.

[0153] The electrode assembly 2 may be partially located within the housing 11 or may be entirely located within the housing 11.

[0154] The electrode assembly 2 can be a stacked structure or a wound structure. In an embodiment where the electrode assembly 2 is a stacked structure, the main body 21 can include multiple positive electrode sheets and multiple negative electrode sheets, which are stacked along a third direction Z, where Z can be the direction in which the electrode sheets are stacked. In an embodiment where the electrode assembly 2 is a wound structure, the main body 21 can include a straight region and two bending regions, which are respectively located at opposite ends of the main body 21 along a second direction Y. The main body 21 includes positive electrode sheets and negative electrode sheets, and the portions of the positive and negative electrode sheets located in the straight region are stacked along a third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0155] The first direction X can be the thickness direction of the first wall 12. The main body 21 has two opposite ends along the first direction X, one end of which faces the first wall 12 and the other end of which faces away from the first wall 12. The first electrode 22 is disposed at the end of the main body 21 facing the first wall 12.

[0156] The first electrode tab 22 is a tab disposed on the end of the main body 21 facing the first wall 12 along the first direction X in the electrode assembly 2. Taking an example where both the positive and negative electrode tabs are disposed on the end of the main body 21 facing the first wall 12 along the first direction X, both the positive and negative electrode tabs are the first electrode tab 22. Alternatively, if the positive and negative electrode tabs are disposed at opposite ends of the main body 21 along the first direction X, the tab disposed on the end of the main body 21 facing the first wall 12 along the first direction X is the first electrode tab 22. The first electrode tab 22 can be directly connected to the electrode terminal 3, for example, by welding the first electrode tab 22 to the electrode terminal 3. The first electrode tab 22 can also be indirectly connected to the electrode terminal 3, for example, through a current collector. The current collector can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0157] The insulating body 41 may be partially located between the first wall 12 and the main body 21, or it may be located entirely between the first wall 12 and the main body 21.

[0158] The abutting part 42 and the insulating body 41 can be integrally formed, or the abutting part 42 and the insulating body 41 can be separately provided, with the abutting part 42 connected to the insulating body 41.

[0159] The abutment portion 42 may partially or completely protrude from the first surface 411. The insulating body 41 may have one abutment portion 42 or multiple abutment portions 42. As an example, there may be two abutment portions 42, which may be located at both ends of the first insulating member 4 along the second direction Y, and the two abutment portions 42 may be spaced apart.

[0160] The abutment portion 42 has two opposing sides along the second direction Y, one side facing the first electrode tab 22 and the other side facing away from the first electrode tab 22. A support member 5 is disposed on the side of the abutment portion 42 facing the first electrode tab 22. The support member 5 can be fixedly connected to the abutment portion 42, or the support member 5 can be detachably connected to the abutment portion 42. The support member 5 is attached to the first surface 411. This attachment can be either contact or connection; that is, the support member 5 can contact the first surface 411, or the support member 5 can be connected to the first surface 411. If the support member 5 is connected to the first surface 411, it can be a fixed connection, such as by bonding or integral molding; or it can be a detachable connection, such as by threaded connection or snap-fit ​​connection.

[0161] In this embodiment, the battery cell 10 also includes a support member 5, which is positioned on the abutment portion 42. The support member 5 is located on the side of the abutment portion 42 facing the first tab 22 along the second direction Y. The support member 5 is attached to the first surface 411, thereby enabling the support member 5 to support the connection between the abutment portion 42 and the insulating body 41. That is, when the abutment portion 42 is subjected to tensile force and bends inward, the concentrated stress generated at the connection between the abutment portion 42 and the insulating body 41 during the bending deformation process can be dispersed by the support member 5. This reduces the possibility of plastic deformation at the connection between the abutment portion 42 and the insulating body 41, thereby reducing the possibility of the abutment portion 42 being inserted into the electrode assembly 2 and causing damage to the electrode assembly 2, resulting in deformation of the positive and negative electrode sheets. This reduces the risk of internal short circuit in the battery cell 10 and improves the reliability of the battery cell 10.

[0162] Please refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram of the structure of the first insulating member provided in some embodiments of this application (showing the slot and the snap-fit ​​portion), Figure 6 for Figure 5 A partially enlarged schematic diagram at point A. In some embodiments, the support member 5 contacts the first surface 411, and the support member 5 is detachably connected to the abutment portion 42.

[0163] The support member 5 and the abutment part 42 can be detachably connected. Detachable connections include, but are not limited to, threaded connections and snap-fit ​​connections.

[0164] In this embodiment, since the support member 5 and the abutment part 42 are detachably connected, the support member 5 can be securely connected to the abutment part 42 during installation and contact the support member 5 with the first surface 411. This allows the support member 5 to be firmly set between the first surface 411 and the abutment part 42, thereby dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41 during the inward bending deformation of the abutment part 42. This reduces the possibility of plastic deformation at the connection between the abutment part 42 and the insulating body 41. At the same time, since the support member 5 and the abutment part 42 are detachably connected, the support member 5 can be quickly separated from the abutment part 42 during disassembly, which facilitates the replacement of the support member 5.

[0165] Please continue to refer to Figure 5 and Figure 6 In some embodiments, one of the support member 5 and the abutment part 42 is provided with a snap-fit ​​part 51, and the other is provided with a snap-fit ​​groove 421, and the snap-fit ​​part 51 and the snap-fit ​​groove 421 are engaged.

[0166] The support member 5 may have a snap-fit ​​portion 51 on the side near the abutment portion 42, and the abutment portion 42 may have a slot 421 on the side near the support member 5. Alternatively, the abutment portion 42 may have a snap-fit ​​portion 51 on the side near the support member 5, and the support member 5 may have a slot 421 on the side near the abutment portion 42. As an example, the snap-fit ​​portion 51 may be a T-shaped elastic buckle, and the slot 421 may be a groove that matches the shape of the elastic buckle. The snap-fit ​​portion 51 is engaged in the slot 421 to form an interference fit.

[0167] The card slot 421 can extend along the first direction X, the second direction Y, or the third direction Z.

[0168] In this embodiment, due to the structural characteristics of the snap-fit ​​part 51 and the snap-fit ​​groove 421, when the support member 5 and the abutment part 42 are installed, there can be a good bonding force between the support member 5 and the abutment part 42, so that the support member 5 and the abutment part 42 are firmly connected. When the support member 5 is disassembled, the support member 5 and the abutment part 42 can be quickly separated, which facilitates the replacement of the support member 5.

[0169] Please continue to refer to Figure 6 In some embodiments, the slot 421 extends along the first direction X.

[0170] In an embodiment where the support member 5 is detachably connected to the first surface 411, the support member 5 can contact the abutment portion 42. The detachable connection between the support member 5 and the first surface 411 can be achieved by providing a first snap-fit ​​portion 51 on the side of the support member 5 closest to the first surface 411. Figure 6 (Not shown in the image), a first slot 421 is provided on the side of the first surface 411 near the support member 5. Figure 6 (Not shown in the image), the first surface 411 may have a first snap-fit ​​portion 51 on the side near the support member 5. Figure 6 (Not shown in the image), the support member 5 has a first slot 421 on the side near the first surface 411. Figure 6 (not shown in the image), first snap-fit ​​part 51 ( Figure 6 (not shown in the image) and the first slot 421 ( Figure 6 (Not shown in the image) Snap-fit ​​connection.

[0171] In this embodiment, by extending the slot 421 along the first direction X, the movement trajectory of the support 5 can be moved along the first direction X when the support 5 is installed. This facilitates guiding the support 5 to move towards the first surface 411 along the first direction X, thereby simplifying the fit accuracy between the support 5 and other components during installation and improving the installation efficiency of the support 5.

[0172] Please continue to refer to Figure 4 In some embodiments, the support member 5 is fixedly connected to the first surface 411, and the support member 5 is fixedly connected to the abutment portion 42.

[0173] The support member 5 and the first surface 411 can be fixedly connected, including but not limited to adhesive bonding, hot-melt bonding, etc.

[0174] The support member 5 and the abutment part 42 can be fixedly connected, including but not limited to adhesive bonding, hot melt bonding, etc.

[0175] In this embodiment, by setting the support member 5 to be fixedly connected to the first surface 411 and the support member 5 to be fixedly connected to the abutment part 42, the connection between the support member 5 and the insulating body 41 and the connection between the support member 5 and the abutment part 42 becomes more reliable, thereby enhancing the mechanical strength of the connection between the insulating body 41 and the abutment part 42, which is more conducive to the support member 5 dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0176] Please continue to refer to Figure 4 In some embodiments, the insulating body 41, the abutment part 42, and the support member 5 are integrally formed.

[0177] In this embodiment, by integrally forming the insulating body 41, the abutment part 42, and the support member 5, the connection between the support member 5 and the abutment part 42, as well as the connection between the support member 5 and the insulating body 41, becomes more reliable. This further enhances the mechanical strength of the connection between the insulating body 41 and the abutment part 42, which further facilitates the support member 5 in dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0178] Please refer to Figures 7 to 10 , Figure 7 A schematic diagram of the structure of a first insulating member provided for some embodiments of this application (showing the second and third surfaces); Figure 8 for Figure 7 A magnified view of a portion of point B in the middle; Figure 9 A schematic diagram of the structure of a first insulating member provided for other embodiments of this application (showing the second and third surfaces); Figure 10 for Figure 9 A partially enlarged schematic diagram at point C. In some embodiments, along the second direction Y, the abutment portion 42 has a face facing the first electrode tab 22 ( Figures 7 to 10 The second surface 422 (not shown) and the support member 5 have a third surface 52, which connects the second surface 422 and the first surface 411. The third surface 52 is a sloping plane or an arc surface.

[0179] The abutment part 42 has two opposing sides along the second direction Y, one side of which faces the first pole tab 22. Figures 7 to 10 (not shown), one side of which is opposite to the first electrode 22 ( Figures 7 to 10 (Not shown), the second surface 422 can be the abutment 42 facing the first tab 22 ( Figures 7 to 10 The surface on one side (not shown).

[0180] exist Figure 7 and Figure 8 In the illustrated embodiment, the third surface 52 is an inclined plane, and when viewed along the third direction Z, the support member 5 is triangular in shape.

[0181] exist Figure 9 and Figure 10 In the illustrated embodiment, the third surface 52 is an arc surface, which is concave.

[0182] In this embodiment, by setting the third surface 52 of the support member 5 as an inclined plane, the support member 5 is triangular in shape, making the support member 5 a structure that is not easily deformed, thereby better dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41; by setting the third surface 52 of the support member 5 as an arc surface, the shape of the third surface 52 is arc-shaped, so that the concentrated stress can be evenly distributed along the arc, thereby better dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0183] Please refer to Figure 11 and Figure 12 , Figure 11 A schematic diagram of the structure of a first insulating element provided for some embodiments of this application (showing a first inclined plane and a first arc surface); Figure 12 for Figure 11 A partially enlarged schematic diagram at point D. In some embodiments, along the second direction Y, the abutment portion 42 has a face facing the first electrode tab 22 ( Figure 11 and Figure 12 The second surface 422 (not shown) and the support member 5 have a third surface 52, which includes a first inclined plane 521 and a first arc surface 522. The first inclined plane 521 is connected to the second surface 422 and the first arc surface 522 is connected to the first inclined plane 521 and the first surface 411.

[0184] A portion of the third surface 52 can be a first inclined plane 521, and another portion can be a first arc surface 522. The first inclined plane 521 transitions to the first surface 411 through the first arc surface 522, and both the first inclined plane 521 and the first surface 411 can be tangent to the first arc surface 522.

[0185] In this embodiment, by setting the third surface 52 of the support member 5 to be composed of a first inclined plane 521 and a first arc surface 522, and defining the position of the first arc surface 522 between the first surface 411 and the first inclined plane 521, an arc transition area is formed between the support member 5 and the insulating body 41, thereby better dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0186] Please continue to refer to Figure 9 and Figure 10 In some embodiments, along the first direction X, the size of the support member 5 is T1, and the size of the portion of the abutment 42 protruding from the first surface 411 is T2, where 1 / 2≤T1 / T2≤1.

[0187] T1 / T2 can be any point value from 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1, or a range between any two values.

[0188] In this embodiment, by setting T1 / T2≥1 / 2, the size of the support member 5 is not too small, thereby giving the support member 5 a certain mechanical strength, which facilitates the distribution of concentrated stress generated at the connection between the abutment part 42 and the insulating body 41. Setting T1 / T2≤1 ensures that along the first direction X, the support member 5 does not exceed the portion of the abutment part 42 that protrudes from the first surface 411, which helps to reduce the interference of the support member 5 on the electrode assembly 2.

[0189] In some embodiments, 1.5mm ≤ T1 ≤ 10mm,

[0190] T1 can be a point value or a range of any one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm, or a value between any two of them.

[0191] In this embodiment, when T1 ≥ 1.5 mm, the strength of the support member 5 can be increased, thereby improving the support effect of the support member 5 on the abutment part and the insulating body 41; when T1 ≤ 10 mm, the material usage of the support member 5 can be reduced, saving the material cost of the support member 5; therefore, when 1.5 mm ≤ T1 ≤ 10 mm, it is possible to balance increasing the strength of the support member 5 and reducing the material usage of the support member 5, thereby improving the support effect of the support member 5 on the abutment part 42 and the insulating body 41 and saving the material cost of the support member 5.

[0192] In some embodiments, 3mm≤T2≤10mm.

[0193] T2 can be a point value or a range value between any two of the following: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm.

[0194] In this embodiment, when T2 ≥ 3 mm, the strength of the abutment portion 42 can be increased, thereby improving the support effect of the abutment portion 42 on the electrode assembly and the first wall 12; when T2 ≤ 10 mm, the material usage of the abutment portion 42 can be reduced, saving the material cost of the abutment portion 42; therefore, when 1.5 mm ≤ T2 ≤ 10 mm, it is possible to balance increasing the strength of the abutment portion 42 and reducing the material usage of the abutment portion 42, thereby improving the support effect of the abutment portion 42 on the electrode assembly and the first wall 12 and saving the material cost of the abutment portion 42.

[0195] Please continue to refer to Figure 9In some embodiments, along the third direction Z, the size of the support member 5 is W1, the size of the abutment part 42 is W2, 0.125≤W1 / W2≤1, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0196] W1 / W2 can be any point value from 0.125, 0.13, 0.18, 0.23, 0.28, 0.33, 0.38, 0.43, 0.48, 0.53, 0.58, 0.63, 0.68, 0.73, 0.78, 0.83, 0.88, 0.93, 0.98, or 1, or a range between any two.

[0197] In this embodiment, when W1 / W2≥0.125, the support effect of the support member 5 on the abutment part 42 and the insulating body 41 can be improved, and the risk of the abutment part 42 collapsing in the direction of the electrode assembly 2 can be reduced; when W1 / W2≤1, the material used in the support member 5 can be reduced, and the material cost of the support member 5 can be reduced; therefore, when 0.125≤W1 / W2≤1, it is possible to balance reducing the risk of the abutment part 42 collapsing in the direction of the electrode assembly 2 and reducing the material cost of the support member 5.

[0198] In some embodiments, 1.25mm ≤ W1 ≤ 100mm.

[0199] W1 can be a point value or a range of any two of the following: 1.25mm, 2mm, 3mm, 4mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, and 100mm.

[0200] When W1 ≥ 1.25 mm, the strength of the support member 5 can be increased, thereby improving the support effect of the support member 5 on the abutment part 42 and the insulating body 41; when W1 ≤ 100 mm, the material usage of the support member 5 can be reduced, saving the material cost of the support member 5; therefore, when 1.25 mm ≤ W1 ≤ 100 mm, it is possible to balance increasing the strength of the support member 5 and reducing the material usage of the support member 5, improving the support effect of the support member 5 on the abutment part 42 and the insulating body 41, and saving the material cost of the support member 5.

[0201] In some embodiments, 10mm ≤ W2 ≤ 100mm.

[0202] W2 can be a point value or a range value between any two of the following: 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, and 100mm.

[0203] When W2 ≥ 10 mm, the strength of the abutment part 42 can be increased, thereby improving the support effect of the abutment part 42 on the electrode assembly 2 and the first wall; when W2 ≤ 100 mm, the material usage of the abutment part 42 can be reduced, saving the material cost of the abutment part 42; therefore, when 10 mm ≤ W2 ≤ 100 mm, it is possible to balance increasing the strength of the abutment part 42 and reducing the material usage of the abutment part 42, thereby improving the support effect of the abutment part 42 on the electrode assembly 2 and the first wall and saving the material cost of the abutment part 42.

[0204] Please refer to Figure 13 - Figure 15 , Figure 13 Exploded views of a battery cell 10 provided in some embodiments of this application; Figure 14 A schematic diagram of the structure of a first insulating member provided for some embodiments of this application (showing exhaust channel 423); Figure 15 for Figure 14 A partially enlarged schematic diagram at point E. In some embodiments, the abutment portion 42 is provided with an exhaust channel 423, which extends through the abutment portion 42 along the second direction Y.

[0205] The exhaust channel 423 can be a hole that passes through the abutment portion 42 in a direction that intersects with the thickness direction of the insulating body 41. The extension direction of the exhaust channel 423 can be parallel to the first surface 411 or intersect with the first surface 411.

[0206] In this embodiment, by providing an exhaust channel 423 that extends through the abutment portion 42 in the second direction Y, the gas can quickly pass through the abutment portion 42 when it flows through it, reducing the obstruction of the abutment portion 42 to the gas flow and thus facilitating the flow of gas.

[0207] In an embodiment where the abutment portion 42 is provided with an exhaust channel 423 that penetrates the abutment portion 42 along the second direction Y, during actual use of the battery cell 10, the presence of the exhaust channel 423 on the abutment portion 42 results in multiple penetrating areas in the overall structure of the abutment portion 42. This reduces the structural strength of the abutment portion 42, making it prone to bending and deforming inward relative to the insulating body 41 under tensile force. When the abutment portion 42 bends and deforms, stress concentration is more likely to occur at the connection between the abutment portion 42 and the insulating body 41, causing plastic deformation at the connection. This leads to the abutment portion 42 inserting into the electrode assembly 2 and damaging the electrode assembly 2, resulting in an internal short circuit between the positive and negative electrode plates and reducing the reliability of the battery cell 10.

[0208] In this embodiment of the application, since the abutment portion 42 faces the first electrode 22 along the second direction Y ( Figure 14 and Figure 15 A support member 5 is provided on one side (not shown). The support member 5 is attached to the first surface 411. Therefore, the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41 during the bending and deformation of the abutment part 42 inward can be dispersed by the support member 5. This reduces the possibility of plastic deformation at the connection between the abutment part 42 and the insulating body 41, thereby reducing the possibility of the abutment part 42 being inserted into the electrode assembly 2 and causing damage to the electrode assembly 2, resulting in deformation of the positive electrode sheet and the negative electrode sheet. This reduces the risk of internal short circuit in the battery cell 10 and improves the reliability of the battery cell 10.

[0209] Please continue to refer to Figure 13 - Figure 15 In some embodiments, the first wall 12 is provided with a pressure relief mechanism 7, which is configured to be at least partially destroyed when the internal pressure of the battery cell 10 reaches a threshold. The discharge material inside the battery cell 10 can be guided to the pressure relief mechanism 7 through the exhaust channel 423 and discharged from the battery cell 10 to relieve the internal pressure of the battery cell 10.

[0210] In some embodiments, a pressure relief hole 71 is provided on the insulating body 41 at a position corresponding to the pressure relief mechanism 7, and the exhaust channel 423 communicates with the pressure relief hole 71. The discharged material passes through the pressure relief hole and is discharged from the damaged pressure relief mechanism 7 to the battery cell 10.

[0211] Please continue to refer to Figure 13 - Figure 15In some embodiments, the abutment portion 42 is provided with a plurality of exhaust channels 423, which are arranged along the third direction Z. The abutment portion 42 includes at least one partition wall 424, each partition wall 424 separating two adjacent exhaust channels 423. At least one partition wall 424 is provided with a support member 5, which is perpendicular to each other in the first direction X, the second direction Y and the third direction Z.

[0212] Multiple exhaust channels 423 can be located on a straight line parallel to the third direction Z, and multiple exhaust channels 423 can be spaced apart along the third direction Z.

[0213] In an embodiment where multiple exhaust channels 423 are spaced apart along a third direction (Z), the abutment portion 42 may include multiple partition walls 424, each partition wall 424 separating two adjacent exhaust channels 423. The multiple partition walls 424 may be spaced apart along a third direction (Z), and the exhaust channels 423 may be located in the gap between two adjacent partition walls 424.

[0214] Along the second direction Y, the partition wall 424 has two oppositely arranged sides, one of which faces the first electrode tab 22. Figure 14 and Figure 15 (not shown in the image), the other side of which is opposite to the first electrode 22 ( Figure 14 and Figure 15 (Not shown in the image), the support member 5 can be disposed on the partition wall 424 facing the first pole ear 22 ( Figure 14 and Figure 15 (not shown in the image) on one side.

[0215] In this embodiment, multiple exhaust channels 423 are provided by the abutment part 42, and the multiple exhaust channels 423 are arranged along the third direction Z, so that there are multiple positions for gas flow on the abutment part 42, which is conducive to the gas passing through the abutment part 42 and improving the gas flow efficiency. By providing a partition wall 424 to separate two adjacent exhaust channels 423, and providing a support member 5 on the partition wall 424, the installation position of the support member 5 can help reduce the obstruction of the gas flow path in the exhaust channel 423 and improve the gas flow efficiency.

[0216] Please refer to Figure 16 , Figure 16 This is a schematic diagram of the structure of the first insulating member provided in some other embodiments of the present application (showing an exhaust channel). In some embodiments, along the first direction X, the abutment portion 42 further includes an end wall 425, which is closer to the main body portion 21 than the first surface 411. A partition wall 424 is located on the side of the end wall 425 away from the main body portion 21 and is connected to the end wall 425. A portion of the support member 5 is disposed on the partition wall 424, and another portion of the support member 5 is disposed on the end wall 425.

[0217] Along the first direction X, the distance between the end wall 425 and the main body 21 may be less than the distance between the first surface 411 and the main body 21.

[0218] Along the first direction X, the end wall 425 has two sides that are opposite to each other, one side of which faces the main body 21 and the other side faces away from the main body 21. The partition wall 424 may be located on the side of the end wall 425 that faces away from the main body 21.

[0219] The partition wall 424 and the end wall 425 can be fixedly connected. The fixed connection includes, but is not limited to, bonding, hot-melt connection, and integral molding.

[0220] The side of the partition wall 424 facing away from the end wall 425 can be fixedly connected to the first surface 411. The fixed connection includes, but is not limited to, bonding, hot-melt bonding, integral molding, etc.

[0221] Along the second direction Y, the partition wall 424 has two sides that are arranged opposite to each other, one side of which faces the first electrode 22 and the other side faces away from the first electrode 22. A part of the support member 5 can be disposed on the side of the partition wall 424 facing the first electrode 22.

[0222] Along the second direction Y, the end wall 425 has two opposite sides, one side of which faces the first electrode 22 and the other side faces away from the first electrode 22. Another part of the support member 5 can be disposed on the side of the end wall 425 facing the first electrode 22.

[0223] In this embodiment, by providing the abutment part 42 including an end wall 425, and by providing a part of the support member 5 on the partition wall 424 and another part of the support member 5 on the end wall 425, there are more connection positions between the support member 5 and the abutment part 42, thereby making the connection between the support member 5 and the abutment part 42 more reliable, which is more conducive to the support member 5 dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0224] Please continue to refer to Figure 14 and Figure 15 In some embodiments, the abutment portion 42 further includes two sidewalls 426 disposed opposite each other along the third direction Z. Along the third direction Z, all partition walls 424 are located between the two sidewalls 426. Each sidewall 426 forms an exhaust channel 423 with the partition wall 424 closest to the sidewall 426. At least one sidewall 426 is provided with a support member 5.

[0225] Along the third direction Z, the abutment part 42 has two oppositely arranged ends, and two side walls 426 can be located at the two ends of the abutment part 42 respectively.

[0226] One of the two side walls 426 may be provided with a support member 5, and each of the two side walls 426 may be provided with two support members 5.

[0227] In this embodiment, by providing the abutment part 42, a side wall 426 is also provided, and a support member 5 is provided on the side wall 426. The position of the side wall 426 of the abutment part 42 can be fully utilized to install the support member 5, thereby further increasing the number of support members 5. This makes it more beneficial for the support member 5 to disperse the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41.

[0228] Please continue to refer to Figures 14 to 15 In some embodiments, the abutment part 42 includes a plurality of partition walls 424, which are spaced apart along a third direction Z, and each partition wall 424 is provided with a support member 5.

[0229] Multiple support members 5 can be located on a straight line parallel to the third direction Z and arranged at intervals.

[0230] Multiple support components 5 and multiple partition walls 424 can be set one-to-one.

[0231] In this embodiment, by providing a support member 5 on each partition wall 424 and providing multiple partition walls 424 spaced apart along the third direction Z, the support member 5 is spaced apart along the third direction Z, so that the path of concentrated stress transmission on the support member 5 is continuous, which further facilitates the dispersion of concentrated stress between the abutment part 42 and the insulating body 41.

[0232] Please continue to refer to Figure 16 And further refer to Figure 17 - Figure 19 , Figure 17 A schematic diagram of the structure of the first insulating member 4 provided in some embodiments of this application (showing the first through hole); Figure 18 for Figure 17 F-F sectional view; Figure 19 for Figure 17 A schematic diagram of the structure of the first support member 54 and the first through hole 53. In some embodiments, along the third direction Z, the partition wall 424 has a fourth surface 4241 and a fifth surface 4242 opposite to each other. Along the direction from the fourth surface 4241 to the fifth surface 4242, the support member 5 does not extend beyond the fifth surface 4242, and along the direction from the fifth surface 4242 to the fourth surface 4241, the support member 5 does not extend beyond the fourth surface 4241.

[0233] Along the third direction Z, the support member 5 has two opposite sides, which can be located in the area between the fourth surface 4241 and the fifth surface 4242 of the partition wall 424, respectively.

[0234] In this embodiment, by setting the support member 5 in the direction from the fourth surface 4241 to the fifth surface, and setting the support member 5 in the direction from the fifth surface 4242 to the fourth surface 4241, the support member 5 is not extended beyond the fourth surface 4241. This ensures that along the third direction Z, the two sides of the support member 5 do not extend beyond the two sides of the partition wall 424. As a result, the installation position of the support member 5 can help reduce the obstruction of the gas flow path in the exhaust channel 423 and improve the gas passage efficiency.

[0235] Please refer to Figure 17 - Figure 19 In some embodiments, the support member 5 disposed on the partition wall 424 is a first support member 54, at least one first support member 54 is provided with a first through hole 53, at least one partition wall 424 is provided with a second through hole 427, along the second direction Y, the first through hole 53 penetrates the first support member 54, the second through hole 427 penetrates the partition wall 424, and the first through hole 53 and the second through hole 427 are connected.

[0236] The first through hole 53 can be a hole that penetrates the first support member 54 in a direction that intersects with the thickness direction of the insulating body 41. The extension direction of the first through hole 53 can be parallel to the first surface 411 or intersect with the first surface 411.

[0237] The second through hole 427 can be a hole that penetrates the partition wall 424 in a direction that intersects with the thickness direction of the insulating body 41. The extension direction of the second through hole 427 can be parallel to the first surface 411 or intersect with the first surface 411.

[0238] In this embodiment, by providing a first through hole 53 on the first support member 54 and a second through hole 427 on the partition wall 424, and by communicating with the second through hole 427, multiple gas flow channels are formed between the first support member 54 and the partition wall 424, thereby improving the gas flow efficiency.

[0239] Please continue to refer to Figure 19 In some embodiments, the diameter of the first through hole 53 is D1, 0.1mm≤D1≤0.3mm; and / or the diameter of the second through hole 427 is D2, 0.1mm≤D2≤0.3mm.

[0240] D1 can be 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, 0.28mm, 0.3mm, etc.

[0241] D2 can be 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, 0.28mm, 0.3mm, etc.

[0242] The relationship between D1 and D2 can be that D1 equals D2, D1 is less than D2, or D1 is greater than D2.

[0243] In this embodiment, by setting D1 ≥ 0.1 mm, the size of the first through hole 53 is made convenient for gas passage, thereby further improving the gas passage efficiency; by setting D1 ≤ 0.3 mm, the size of the first through hole 53 is not too large, thus affecting the structural strength of the first support member 54. By setting D2 ≥ 0.1 mm, the size of the second through hole 427 is made convenient for gas passage, thereby further improving the gas passage efficiency; by setting D2 ≤ 0.3 mm, the size of the second through hole 427 is not too large, thus affecting the structural strength of the partition wall 424.

[0244] Please continue to refer to Figure 19 In some embodiments, at least one first support member 54 is provided with a plurality of first through holes 53, and the minimum distance between the central axes of two adjacent first through holes 53 is L1, 1.5mm≤L1≤2mm; and / or at least one partition wall 424 is provided with a plurality of second through holes 427, and the minimum distance between the central axes of two adjacent second through holes 427 is L2, 1.5mm≤L2≤2mm.

[0245] L1 can be 1.5mm, 1.53mm, 1.55mm, 1.58mm, 1.6mm, 1.63mm, 1.65mm, 1.68mm, 1.7mm, 1.73mm, 1.75mm, 1.78mm, 1.8mm, 1.83mm, 1.85mm, 1.88mm, 1.9mm, 1.93mm, 1.95mm, 1.98mm, 2mm, etc.

[0246] L2 can be in the following sizes: 1.5mm, 1.53mm, 1.55mm, 1.58mm, 1.6mm, 1.63mm, 1.65mm, 1.68mm, 1.7mm, 1.73mm, 1.75mm, 1.78mm, 1.8mm, 1.83mm, 1.85mm, 1.88mm, 1.9mm, 1.93mm, 1.95mm, 1.98mm, 2mm, etc.

[0247] The relationship between L1 and L2 can be L1 equal to L2, L1 less than L2, or L1 greater than L2.

[0248] In this embodiment, by setting L1 ≥ 1.5 mm, the distance between two adjacent first through holes 53 is not too small, thereby reducing the possibility of interference between the two adjacent first through holes 53 and thus affecting the gas flow. By setting L1 ≤ 2 mm, the distance between two adjacent first through holes 53 is not too large, thereby allowing a relatively reasonable number of first through holes 53 to be set on the first support member 54 of limited size, thus creating more gas passage positions on the first support member 54 and further improving the gas passage efficiency. By setting L2 ≥ 1.5 mm, the distance between two adjacent second through holes 427 is not too small, thereby reducing the possibility of interference between the two adjacent second through holes 427 and thus affecting the gas flow. By setting L2 ≤ 2 mm, the distance between two adjacent second through holes 427 is not too large, thereby allowing a relatively reasonable number of second through holes 427 to be set on the partition wall 424 of limited size, thus creating more gas passage positions on the partition wall 424 and further improving the gas passage efficiency.

[0249] Please refer to Figure 20 , Figure 20 This is a cross-sectional view of a battery cell (without the casing) provided in some embodiments of this application. In some embodiments, the insulating body 41 is connected to the first wall 12.

[0250] The insulating body 41 and the first wall 12 can be connected, for example, a fixed connection, including but not limited to adhesive bonding, heat fusion bonding, etc., or they can be in contact.

[0251] In this embodiment, by connecting the insulating body 41 to the first wall 12, the insulating body 41 and the first wall 12 are securely connected, thereby reducing the risk of the insulating body 41 detaching from the first wall 12.

[0252] Please continue to refer to Figure 20 In some embodiments, the battery cell 10 further includes a second insulating member 6, which covers the outer surface of the main body 21 and is connected to the abutment portion 42.

[0253] The second insulating member 6 can be a component that separates the housing 11 from the electrode assembly 2, thereby achieving insulation isolation between the housing 11 and the electrode assembly 2. The second insulating member 6 can be made of insulating material, including but not limited to plastic, rubber, etc.

[0254] The second insulating element 6 can be a protective film such as Mylar film, which can be used to cover the electrode assembly 2, preventing the electrode assembly 2 from being scratched by the outer shell 1 when it is inserted into the shell, and at the same time providing insulation.

[0255] The second insulating member 6 can wrap around the outer surface of the main body 21 along the circumferential direction of the opening of the housing 11. The electrode assembly 2 inside the housing 1 can be one or more. If there is one electrode assembly 2, the insulating member can cover the periphery of the electrode assembly 2; if there are multiple electrode assemblies 2, the multiple electrode assemblies 2 can be stacked along the thickness direction of the electrode assembly 2. One electrode assembly 2 can be provided with one insulating member, and each insulating member can cover the periphery of one electrode assembly 2. Alternatively, multiple electrode assemblies 2 can be a whole component, and the insulating member can cover the periphery of the whole component.

[0256] The second insulating member 6 and the abutting part 42 can be fixedly connected, including but not limited to adhesive bonding, heat fusion bonding, etc.

[0257] In this embodiment, by providing a second insulating member 6 to cover the outer surface of the main body 21, insulation isolation between the electrode assembly 2 and the housing 11 is achieved. By providing the second insulating member 6 to be connected to the abutment part 42, the connection between the second insulating member 6 and the abutment part 42 is secure, which helps the second insulating member 6 to provide support for the electrode assembly 2.

[0258] In an embodiment where the insulating body 41 is connected to the first wall 12, and the battery cell 10 includes a second insulating member 6, which covers the outer surface of the main body 21 and is connected to the abutment part 42, during actual use of the battery cell 10, the second insulating member 6 will be subjected to the gravity generated by the electrode assembly 2, and the second insulating member 6 will exert a certain pulling force on the abutment part 42. Due to the insufficient mechanical strength of the connection between the abutment part 42 and the insulating body 41, the abutment part 42 is prone to bending and deforming inward relative to the insulating body 41 under the action of the pulling force. When the abutment part 42 bends and deforms, the connection between the abutment part 42 and the insulating body 41 will be more prone to stress concentration, causing plastic deformation at the connection, which leads to the abutment part 42 inserting into the electrode assembly 2 and damaging the electrode assembly 2, thereby causing internal short circuits in the positive and negative electrode plates, resulting in a decrease in the reliability of the battery cell 10.

[0259] In this embodiment of the application, since the abutment portion 42 faces the first electrode 22 along the second direction Y ( Figure 20 A support member 5 is provided on one side (not shown in the image). The support member 5 is attached to the first surface 411. Therefore, the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41 during the bending and deformation of the abutment part 42 inward can be dispersed by the support member 5. This reduces the possibility of plastic deformation at the connection between the abutment part 42 and the insulating body 41, thereby reducing the possibility of the abutment part 42 being inserted into the electrode assembly 2 and causing damage to the electrode assembly 2, resulting in deformation of the positive and negative electrode sheets. This reduces the risk of internal short circuit in the battery cell 10 and improves the reliability of the battery cell 10.

[0260] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0261] This application provides an electrical device, including a battery cell 10 provided in any of the above embodiments.

[0262] Please continue to refer to Figure 3 - Figure 10 , Figure 14 - Figure 20This application provides a battery cell 10, including a housing 1, an electrode assembly 2, a first insulating member 4, a support member 5, and a second insulating member 6. The housing 1 has a first wall 12, and the electrode assembly 2 is housed within the housing 1. The electrode assembly 2 includes a main body 21 and a first tab 22, with the first tab 22 disposed at one end of the main body 21 facing the first wall 12 along a first direction X. The first insulating member 4 includes an insulating body 41 and abutting portion 42. The insulating body 41 is at least partially disposed between the first wall 12 and the main body 21, and is connected to the first wall 12. The insulating body 41 has a first surface 411 facing the main body 21. The abutting portion 42 is connected to the insulating body 41, and at least partially protrudes from the first surface 411. The abutting portion 42 is disposed opposite to the main body 21, and the abutting portion 42 and the first tab 22 are arranged along a second direction Y, which is perpendicular to the first direction X. The abutment part 42 is provided with multiple exhaust channels 423, which are arranged along the third direction Z. The abutment part 42 includes multiple partition walls 424, each partition wall 424 separating two adjacent exhaust channels 423. Each partition wall 424 is provided with a support member 5. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The abutment part 42 also includes two side walls 426 arranged opposite each other along the third direction Z. Along the third direction Z, all partition walls 424 are located between two side walls 426. Each side wall 426 forms an exhaust channel 423 with the partition wall 424 closest to it. Each of the two side walls 426 is provided with a support member 5. The support member 5 is disposed on the abutment portion 42 and located on the side of the abutment portion 42 facing the first electrode tab 22 along the second direction Y. The support member 5 contacts the first surface 411. The support member 5 is provided with a snap-fit ​​portion 51, and the abutment portion 42 is provided with a snap-fit ​​groove 421. The snap-fit ​​portion 51 and the snap-fit ​​groove 421 are engaged. Along the second direction Y, the abutment portion 42 has a second surface 422 facing the first electrode tab 22. The support member 5 has a third surface 52, which connects the second surface 422 and the first surface 411. The third surface 52 is a sloping plane or an arc surface. The support member 5 disposed on the partition wall 424 is a first support member 54. At least one first support member 54 is provided with a first through hole 53, and at least one partition wall 424 is provided with a second through hole. Along the second direction Y, the first through hole 53 penetrates the first support member 54, and the second through hole penetrates the partition wall 424. The first through hole 53 and the second through hole are connected. The second insulating member 6 covers the outer surface of the main body 21 and is connected to the abutment part 42.

[0263] In such a battery cell 10, by providing a support member 5 between the abutment portion 42 and the insulating body 41, the concentrated stress generated at the connection between the abutment portion 42 and the insulating body 41 during the bending and deformation of the abutment portion 42 can be dispersed by the support member 5, thereby reducing the possibility of plastic deformation at the connection between the abutment portion 42 and the insulating body 41, and further reducing the possibility that the abutment portion 42 may not be able to spring back and damage the electrode assembly 2, causing deformation of the positive electrode and the negative electrode, thereby reducing the risk of internal short circuit in the battery cell 10. Multiple exhaust channels 423 are provided on the abutment portion 42, providing multiple gas flow points and facilitating gas passage through the abutment portion 42, thus improving gas flow efficiency. A partition wall 424 separates adjacent exhaust channels 423, and a support member 5 is provided on the partition wall 424. The installation position of the support member 5 helps to reduce obstruction of the gas flow path in the exhaust channels 423, further improving gas flow efficiency. By providing one support member 5 on each partition wall 424, the path of concentrated stress transmission on the support member 5 is continuous, further facilitating the dispersion of concentrated stress at the connection between the abutment portion 42 and the insulating body 41. Support members 5 are also provided on the side wall 426, allowing full utilization of the space on the side wall 426 of the abutment portion 42. This increases the number of support members 5, further enhancing their ability to disperse concentrated stress at the connection between the abutment portion 42 and the insulating body 41. By setting the support member 5 to contact the first surface 411, the first surface 411 can position the support member 5 for installation. By setting the support member 5 to be detachably connected to the abutment part 42, the support member 5 and the abutment part 42 are detachably connected, thus facilitating the installation and removal of the support member 5. By setting the third surface 52 of the support member 5 as an inclined plane, the shape of the support member 5 is triangular, making the support member 5 a structure that is not easily deformed, thereby better dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41. By setting the third surface 52 of the support member 5 as an arc surface, the concentrated stress can be evenly distributed along the arc surface, thereby better dispersing the concentrated stress generated at the connection between the abutment part 42 and the insulating body 41. By providing a first through hole 53 on the first support member 54 and a second through hole on the partition wall 424, with the first through hole 53 communicating with the second through hole, multiple gas flow channels are formed between the support member 5 and the partition wall 424, thereby improving the gas flow efficiency. In summary, the reliability of the battery cell 10 is improved by the above-mentioned battery cell 10 structure.

[0264] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0265] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has a first wall; An electrode assembly is housed within the housing. The electrode assembly includes a main body and a first electrode tab, wherein the first electrode tab is disposed at one end of the main body facing the first wall along a first direction. The first insulating element includes an insulating body and a contact portion. The insulating body is at least partially disposed between the first wall and the main body portion. Along the first direction, the insulating body has a first surface facing the main body portion. The contact portion is connected to the insulating body and at least partially protrudes from the first surface. The contact portion is disposed opposite to the main body portion. The contact portion and the first electrode tab are arranged along a second direction, which is perpendicular to the first direction. A support member is disposed on the abutment portion and located on the side of the abutment portion facing the first electrode tab along the second direction, and the support member is attached to the first surface.

2. The battery cell as described in claim 1, characterized in that, The support member is in contact with the first surface, and the support member is detachably connected to the abutment portion.

3. The battery cell as described in claim 2, characterized in that, One of the support member and the abutment part is provided with a snap-fit ​​part, and the other is provided with a snap-fit ​​groove, wherein the snap-fit ​​part and the snap-fit ​​groove are engaged in a snap-fit ​​cooperation.

4. The battery cell as described in claim 3, characterized in that, The slot extends along the first direction.

5. The battery cell as described in claim 1, characterized in that, The support member is fixedly connected to the first surface, and the support member is fixedly connected to the abutment portion.

6. The battery cell as described in claim 5, characterized in that, The insulating body, the abutment part, and the support member are integrally formed.

7. The battery cell as described in claim 5, characterized in that, Along the second direction, the abutment has a second surface facing the first electrode tab, and the support has a third surface that connects the second surface and the first surface. The third surface is an inclined plane or an arc surface.

8. The battery cell as described in claim 5, characterized in that, Along the second direction, the abutment has a second surface facing the first electrode tab, and the support has a third surface, the third surface including a first inclined plane and a first arc surface, the first inclined plane being connected to the second surface, and the first arc surface being connected to the first inclined plane and the first surface.

9. The battery cell as described in claim 1, characterized in that, Along the first direction, the size of the support member is T1, and the maximum size of the portion of the abutment protruding from the first surface is T2, where 1 / 2 ≤ T1 / T2 ≤ 1.

10. The battery cell as described in claim 9, characterized in that, 1.5mm≤T1≤10mm, and / or 3mm≤T2≤10mm.

11. The battery cell as described in claim 1, characterized in that, Along the third direction, the size of the support member is W1, the size of the abutment part is W2, 0.125≤W1 / W2≤1, and the first direction, the second direction, and the third direction are perpendicular to each other.

12. The battery cell as described in claim 11, characterized in that, 1.25mm≤W1≤100mm, and / or 10mm≤W2≤100mm.

13. The battery cell as described in claim 1, characterized in that, The abutment part is provided with a plurality of support members, which are arranged at intervals along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

14. The battery cell according to any one of claims 1-13, characterized in that, The abutment portion is provided with an exhaust channel, which extends through the abutment portion along the second direction.

15. The battery cell as described in claim 14, characterized in that, The abutment portion is provided with multiple exhaust channels, which are arranged along a third direction. The abutment portion includes at least one partition wall, each partition wall separating two adjacent exhaust channels. At least one partition wall is provided with the support member, and the first direction, the second direction, and the third direction are perpendicular to each other.

16. The battery cell as described in claim 15, characterized in that, Along the first direction, the abutment portion further includes an end wall, which is closer to the main body portion than the first surface. The partition wall is located on the side of the end wall opposite to the main body portion and is connected to the end wall. A portion of the support member is disposed on the partition wall, and another portion of the support member is disposed on the end wall.

17. The battery cell as described in claim 15, characterized in that, The abutment portion further includes two sidewalls arranged opposite each other along the third direction. Along the third direction, all the partition walls are located between the two sidewalls. Each sidewall forms an exhaust channel with the partition wall closest to the sidewall. At least one sidewall is provided with a support member.

18. The battery cell as described in claim 15, characterized in that, The abutment includes multiple partition walls, which are spaced apart along the third direction, and each partition wall is provided with the support member.

19. The battery cell as described in claim 15, characterized in that, Along the third direction, the partition wall has opposing fourth and fifth surfaces. In the direction from the fourth surface to the fifth surface, the support does not extend beyond the fifth surface, and in the direction from the fifth surface to the fourth surface, the support does not extend beyond the fourth surface.

20. The battery cell as described in claim 15, characterized in that, The support member disposed on the partition wall is a first support member. At least one of the first support members is provided with a first through hole, and at least one of the partition walls is provided with a second through hole. Along the second direction, the first through hole penetrates the first support member, and the second through hole penetrates the partition wall. The first through hole and the second through hole are connected.

21. The battery cell as described in claim 20, characterized in that, The diameter of the first through hole is D1, 0.1mm≤D1≤0.3mm; and / or the diameter of the second through hole is D2, 0.1mm≤D2≤0.3mm.

22. The battery cell as described in claim 20, characterized in that, At least one of the first support members is provided with a plurality of first through holes, the minimum distance between the central axes of two adjacent first through holes is L1, 1.5mm≤L1≤2mm; and / or at least one of the partition walls is provided with a plurality of second through holes, the minimum distance between the central axes of two adjacent second through holes is L2, 1.5mm≤L2≤2mm.

23. The battery cell according to any one of claims 1-13, characterized in that, The insulating body is connected to the first wall.

24. The battery cell according to any one of claims 1-13, characterized in that, The battery cell also includes a second insulating member, which covers the outer surface of the main body and is connected to the abutting portion.

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

26. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-24 or a battery device as described in claim 25.

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