Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing including a first wall, an electrode assembly, and a first insulator. The electrode assembly is arranged in the shell and comprises a pole piece, the pole piece is provided with a straight area, and the straight area is arranged in a stacked mode in the first direction. The first insulating part is arranged between the first wall and the electrode assembly, a boss is formed on the side, facing the electrode assembly, of the first insulating part, the boss is arranged at at least one end, in the second direction, of the first insulating part, and a groove corresponding to the boss in position is formed in the side, away from the electrode assembly, of the first insulating part. The second direction, the first direction and the thickness direction of the first wall are perpendicular to each other. A first reinforcing rib is arranged in the groove, and the length direction of the orthographic projection of the first reinforcing rib in the plane perpendicular to the thickness direction of the first wall intersects with the second direction. The battery monomer has relatively high reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, 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] Improving the reliability of individual battery cells is a pressing issue in battery technology. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, which includes a casing, an electrode assembly, and a first insulating member. The casing includes a first wall. The electrode assembly is disposed within the casing and includes electrode sheets having flat regions, which are stacked along a first direction. The first insulating member is disposed between the first wall and the electrode assembly. A boss is formed on the side of the first insulating member facing the electrode assembly. The boss is located at at least one end of the first insulating member in a second direction. A groove corresponding to the position of the boss is formed on the side of the first insulating member away from the electrode assembly. The second direction, the first direction, and the thickness direction of the first wall are all perpendicular to each other. A first reinforcing rib is disposed within the groove. The length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall intersects the second direction.

[0006] In the technical solution of this application embodiment, since the length direction of the orthogonal projection of the first reinforcing rib on the plane perpendicular to the thickness direction of the first wall intersects with the second direction, the risk of the first reinforcing rib piercing the separator between the electrode sheets is low, that is, the risk of short circuit of the battery cell is low, and the reliability of the battery cell is high.

[0007] In one or more embodiments of the first aspect, the length direction of the orthogonal projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall is parallel to the first direction.

[0008] In the above scheme, since the length direction of the orthographic projection of the first reinforcing rib on the plane perpendicular to the thickness direction of the first wall is parallel to the first direction, the stress points between the first reinforcing rib and each electrode of the electrode assembly are distributed along the first direction, which helps to reduce the risk of torsion and deformation of the electrode assembly, and the electrode assembly has high structural stability.

[0009] In one or more embodiments of the first aspect, the thickness of the first reinforcing rib is H1, satisfying 0.1mm≤H1≤3mm.

[0010] In the above scheme, when H1≥0.1mm, the thickness of the first reinforcing rib is large, the ability to resist deformation is strong, and the first insulating component has high structural stability; when H1≤3mm, the first reinforcing rib not only improves the strength of the first insulating component, but also has a small mass, and the battery cell has high energy density; therefore, when 0.1mm≤H1≤3mm, the battery cell can have high structural stability and high energy density.

[0011] In one or more embodiments of the first aspect, the groove includes a first sidewall and a second sidewall spaced apart along a first direction, and the two ends of the first reinforcing rib are respectively connected to the first sidewall and the second sidewall.

[0012] In the above scheme, when the two ends of the first reinforcing rib are respectively connected to the first sidewall and the second sidewall, on the one hand, the local rigidity of the groove can be effectively improved, and the structural strength of the area where the groove is set in the first insulating component can be improved. On the other hand, in the embodiment of injection molding of the first insulating component, the flow channels corresponding to the first sidewall, the second sidewall and the first reinforcing rib can be interconnected, which is conducive to the flow and filling of the injection material, thereby reducing the injection pressure, shortening the filling time of the injection material and improving production efficiency. It can also make the distribution of the injection material more uniform during the injection process, and reduce the risk of stress concentration in the first insulating component after molding.

[0013] In one or more embodiments of the first aspect, a plurality of first reinforcing ribs are provided, and the plurality of first reinforcing ribs are spaced apart along the second direction.

[0014] In the above scheme, setting multiple first reinforcing ribs can further improve the structural strength of the first insulating component.

[0015] In one or more embodiments of the first aspect, along the second direction, the distance D between two adjacent first reinforcing ribs satisfies 0.5mm≤D≤3mm.

[0016] In the above scheme, when D≥0.5mm, in the embodiment of injection molding the first insulating part, the distance between two adjacent first reinforcing ribs is relatively large. During the molding process of the first insulating part, the flowability of the injection molding material is good, which helps to reduce the risk of stress concentration in the first insulating part after molding and gives the first insulating part high structural stability. When D≤3mm, the distance between two adjacent first reinforcing ribs is small, and a relatively large number of first reinforcing ribs can be distributed in the groove, which helps to improve the strength of the groove area of ​​the first insulating part. Therefore, when 0.5mm≤D≤3mm, the first insulating part can take into account both high structural stability and high strength.

[0017] In one or more embodiments of the first aspect, the groove includes a third sidewall and a fourth sidewall spaced apart along a second direction. Along the second direction, the thickness of the third sidewall is H2, satisfying 0.1mm ≤ H2 ≤ 3mm; and / or, along the second direction, the thickness of the fourth sidewall is H3, satisfying 0.1mm ≤ H3 ≤ 3mm.

[0018] In the above scheme, when H2≥0.1mm, the thickness of the third sidewall is relatively large, the groove has a strong resistance to deformation, the groove has high structural strength, and thus the first insulating component has high structural strength; when H2≤3mm, the thickness of the third sidewall is relatively small, the overall weight of the first insulating component is relatively light, and the battery cell has high energy density; when 0.1mm≤H2≤3mm, the first insulating component has high structural strength, and the battery cell has high energy density.

[0019] When H3 ≥ 0.1 mm, the thickness of the fourth sidewall is relatively large, the groove has a strong resistance to deformation, and the groove has high structural strength, which in turn enables the first insulating component to have high structural strength. When H3 ≤ 3 mm, the thickness of the fourth sidewall is relatively small, the overall weight of the first insulating component is relatively light, and the battery cell has high energy density. When 0.1 mm ≤ H3 ≤ 3 mm, the first insulating component has high structural strength, and the battery cell has high energy density.

[0020] In one or more embodiments of the first aspect, 0.2mm ≤ H2 ≤ 2mm; and / or, 0.2mm ≤ H3 ≤ 2mm.

[0021] In the above scheme, when H2≥0.2mm, the thickness of the third sidewall is further increased, the ability of the groove to resist deformation is further strengthened, which is conducive to further improving the structural strength of the groove, and thus further improving the structural strength of the first insulating component; when H2≤2mm, the thickness of the third sidewall is further reduced, the overall weight of the first insulating component is further reduced, and the energy density of the battery cell is further improved; when 0.2mm≤H2≤2mm, while further improving the structural strength of the first insulating component, the energy density of the battery cell can also be further improved.

[0022] When H3 ≥ 0.2 mm, the thickness of the third sidewall increases further, the groove's resistance to deformation is further strengthened, which is conducive to further improving the structural strength of the groove, and thus to further improving the structural strength of the first insulating component; when H3 ≤ 2 mm, the thickness of the third sidewall decreases further, the overall weight of the first insulating component is further reduced, and the energy density of the battery cell is further improved; when 0.2 mm ≤ H3 ≤ 2 mm, while further improving the structural strength of the first insulating component, the energy density of the battery cell can also be further improved.

[0023] In one or more embodiments of the first aspect, the thickness of the bottom wall of the groove is H4, satisfying 0.1mm≤H4≤3mm.

[0024] In the above design, because the groove is located on the bottom wall, on the one hand, the force distribution is more uniform when the boss contacts the electrode assembly, which helps reduce the risk of stress concentration and thus improves the structural stability of the battery cell. On the other hand, the bottom wall design prevents the first reinforcing rib from directly contacting the electrode assembly, reducing the risk of the first reinforcing rib inserting between the electrodes and puncturing the separator during battery cell assembly. Furthermore, in the event of thermal runaway of the battery cell, at least part of the bottom wall needs to melt to allow the first reinforcing rib to directly contact the electrode assembly, further reducing the risk of the first reinforcing rib inserting between the electrodes and puncturing the separator during thermal runaway. This further improves the reliability of the battery cell.

[0025] When H4 ≥ 0.1 mm, the bottom wall thickness of the groove is relatively large, the structural strength of the groove is high, the risk of groove deformation is low, and the first insulating component has high structural stability. When H4 ≤ 3 mm, the bottom wall thickness of the groove is relatively small, the overall weight of the first insulating component is relatively light, which is conducive to enabling the battery cell to have a high energy density. When 0.1 mm ≤ H4 ≤ 3 mm, it is conducive to enabling the first insulating component to have high structural stability while enabling the battery cell to have a high energy density.

[0026] In one or more embodiments of the first aspect, 0.2mm ≤ H4 ≤ 2mm.

[0027] In the above scheme, when H4≥0.2mm, the further increase in the bottom wall of the groove is beneficial to further improve the structural strength of the groove, thereby further improving the structural stability of the first insulating component; when H4≤2mm, the thickness of the bottom wall of the groove is further reduced, and the overall weight of the first insulating component is lighter, which is beneficial to enable the battery cell to have a higher energy density; when 0.2mm≤H4≤2mm, it is beneficial to further improve the structural stability of the first insulating component while further improving the energy density of the battery cell.

[0028] In one or more embodiments of the first aspect, the groove penetrates the first insulating member along the thickness direction of the first wall.

[0029] In the above solution, since the length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall intersects with the second direction, the groove penetrates the first insulating member along the thickness direction of the first wall. This reduces the risk of the first reinforcing rib puncturing the separator between the electrode sheets, giving the first insulating member higher structural strength while eliminating the need for components to seal the groove, thus improving the energy density of the battery cell.

[0030] In one or more embodiments of the first aspect, at least one end of the first reinforcing rib extends beyond the electrode assembly along the first direction.

[0031] In the above scheme, since at least one end of the first reinforcing rib extends beyond the electrode assembly along the first direction, the first reinforcing rib has a stronger ability to resist the shaking of the electrode assembly, which can further improve the structural stability of the battery cell.

[0032] In one or more embodiments of the first aspect, the first reinforcing rib is integrally formed with the first insulating member.

[0033] In the above solution, the first reinforcing rib and the first insulating component are integrally formed, resulting in a more uniform stress distribution and higher structural stability for the first insulating component. Furthermore, this design simplifies the assembly process of individual battery cells and shortens the assembly cycle time.

[0034] In one or more embodiments of the first aspect, a second reinforcing rib is further provided in the groove, and the second reinforcing rib intersects with the first reinforcing rib.

[0035] In the above scheme, the length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall intersects with the second direction. A second reinforcing rib is also provided in the groove, intersecting with the first reinforcing rib. The provision of the first reinforcing rib reduces the risk of the first and second reinforcing ribs puncturing the insulating member when inserted between the electrode sheets. The provision of the second reinforcing rib further improves the structural strength of the groove area of ​​the first insulating member, thereby improving the structural stability of the first insulating member.

[0036] In one or more embodiments of the first aspect, the electrode assembly is a stacked structure.

[0037] In the above scheme, since all areas of the electrode sheets in the stacked electrode assembly are flat areas, setting the length direction of the orthogonal projection of the first reinforcing rib on the plane perpendicular to the thickness direction of the first wall to intersect with the second direction can significantly reduce the risk of the first reinforcing rib puncturing the separator when inserted between the electrode sheets, thereby enabling the battery cell to have higher reliability.

[0038] In one or more embodiments of the first aspect, the electrode assembly is a wound structure, and the electrode assembly further has a corner region, wherein the straight region is provided with a corner region at at least one end along the second direction.

[0039] In the above scheme, since the flat region stacking direction of the electrode sheets in the wound electrode assembly is the first direction, setting the length direction of the orthogonal projection of the first reinforcing rib onto the plane perpendicular to the thickness direction of the first wall to intersect with the second direction can significantly reduce the risk of the first reinforcing rib piercing the separator when inserted between the flat regions of the electrode sheets, thereby giving the battery cell higher reliability. Meanwhile, in embodiments where the size of the groove along the first direction is larger than the size of the groove along the second direction, setting the length direction of the orthogonal projection of the first reinforcing rib onto the plane perpendicular to the thickness direction of the first wall to intersect with the second direction, compared to embodiments where the length direction of the orthogonal projection of the first reinforcing rib onto the plane perpendicular to the thickness direction of the first wall is parallel to the second direction, results in a longer first reinforcing rib, further reducing the risk of piercing the separator when inserted between electrode sheets located in the flat region and / or corner region. Therefore, this arrangement can improve the reliability of the battery cell.

[0040] In one or more embodiments of the first aspect, the battery cell further includes a pressure relief mechanism disposed on the first wall.

[0041] In the above scheme, during the thermal runaway of a battery cell, gas is discharged through a pressure relief mechanism located on the first wall. In the later stages of thermal runaway, the internal pressure of the battery cell exceeds its external pressure, causing the electrode assembly to tend to move closer to the first wall. At this point, the risk of the electrode assembly squeezing the first insulating member, leading to the first reinforcing rib inserting into the electrode plates, is high. Setting the length direction of the first reinforcing rib's orthogonal projection onto a plane perpendicular to the thickness direction of the first wall to intersect with the second direction can significantly reduce the risk of the first reinforcing rib inserting into the electrode plates.

[0042] In one or more embodiments of the first aspect, the dimension of the first reinforcing rib along the first direction is L1, and the dimension of the boss along the first direction is L2, satisfying: 0.5≤L1 / L2≤0.99.

[0043] In the above scheme, when L1 / L2≥0.5, the first reinforcing rib can apply a certain supporting force to most areas of the electrode assembly, which can reduce the risk of electrode assembly shaking and thus improve the structural stability of the battery cell; when L1 / L2≤0.99, the arrangement of the first reinforcing rib is relatively easy, that is, the battery cell has a lower processing difficulty; therefore, when 0.5≤L1 / L2≤0.99, the structural stability of the battery cell can be improved while the battery cell has a lower processing difficulty.

[0044] In one or more embodiments of the first aspect, 0.7 ≤ L1 / L2 ≤ 0.99.

[0045] In the above scheme, when L1 / L2≥0.7, the area where the first reinforcing rib can apply a supporting force to the electrode assembly can be further increased, further reducing the risk of electrode assembly shaking, and thus further improving the structural stability of the battery cell; when L1 / L2≤0.99, the arrangement of the first reinforcing rib is relatively easy, that is, the battery cell has a lower processing difficulty; therefore, when 0.7≤L1 / L2≤0.99, the structural stability of the battery cell can be further improved while the battery cell has a lower processing difficulty.

[0046] Secondly, this application provides a battery device that includes the battery cell described in one or more of the above embodiments.

[0047] In the above solutions, since the battery cells in one or more of the above embodiments have high reliability, the battery device including the battery cells in one or more of the above embodiments also has high reliability.

[0048] Thirdly, this application provides an electrical device that includes a battery cell or battery device as described in one or more of the above embodiments, wherein the battery cell or battery device is used to provide electrical energy.

[0049] In the above solutions, since the battery cells or battery devices in one or more of the above embodiments have high reliability, the electrical devices including the battery cells or battery devices in one or more of the above embodiments also have high reliability.

[0050] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0052] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0053] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0054] Figure 3 Exploded views of individual battery cells from some embodiments of this application;

[0055] Figure 4 This is a schematic diagram of the structure of the electrode assembly in some embodiments of this application;

[0056] Figure 5 This is an exploded view of a portion of the structure of a battery cell according to some embodiments of this application;

[0057] Figure 6 This is a cross-sectional view of a battery cell according to some embodiments of this application;

[0058] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0059] Figure 8 This is a cross-sectional view of a portion of the structure of the first insulating member in some embodiments of this application;

[0060] Figure 9 for Figure 8 A magnified view of a section at point B in the middle;

[0061] Figure 10 This is a schematic diagram of the structure of the first insulating element in some embodiments of this application.

[0062] The reference numerals in the detailed embodiments are as follows:

[0063] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 12 - Battery Cell; 121 - Shell; 1210 - First Wall; 1211 - End Cap; 1212 - Housing; 122 - Electrode Assembly; 1221 - Straight Area; 1222 - Corner Area; 1223 - Main Body; 1224 - Tab; 1225 - Positive Electrode; 1226 - Negative Electrode; 1227 - Isolator; 123-First insulating component; 1231-Boss; 1232-Groove; 12321-First sidewall; 12322-Second sidewall; 12323-Third sidewall; 12324-Fourth sidewall; 1233-First reinforcing rib; 1234-Second reinforcing rib; 1235-Through hole; 1236-Drainage hole; 124-Adapter; 125-Electrode terminal; 126-Pressure relief mechanism; X-First direction; Y-Second direction; Z-Thickness direction of the first wall. Detailed Implementation

[0064] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0067] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal 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, nickel, 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.).

[0075] 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 for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0076] 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.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0078] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal 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, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, 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 (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.).

[0079] 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.

[0080] 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.

[0081] 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0088] In some implementations, the electrode assembly is a stacked structure.

[0089] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0090] 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.

[0091] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0092] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0093] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0094] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0095] 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.

[0096] 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.

[0097] In some embodiments, the battery cell may further include a pressure relief mechanism disposed on the housing, which is used to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined value.

[0098] 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.

[0099] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0100] 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 and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0102] 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.

[0103] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0104] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0105] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0106] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0107] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the openings of the housing to define a space for accommodating the electrode assemblies.

[0108] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0109] To reduce the risk of electrode assembly wobbling, a boss is typically provided on the lower plastic of the battery cell to abut against the electrode assembly. To balance the energy density of the battery cell and the strength of the boss, a groove is provided within the boss, and a reinforcing rib is provided in the groove. Since the reinforcing rib is perpendicular to the stacking direction of the flat area of ​​the electrode assembly's plates, to reduce the risk of the reinforcing rib inserting into the interlayer of the electrode assembly's plates and puncturing the separator, causing a short circuit in the battery cell, a bottom wall is usually provided on the side of the groove facing the electrode assembly to seal the groove, thus preventing the reinforcing rib from being exposed.

[0110] However, if the bottom wall is melted through by the high temperature during thermal runaway when the battery cell is thermally runaway, the reinforcing ribs in the straight area perpendicular to the electrode assembly will be exposed. At this time, the reinforcing ribs inserted between the electrode sheets will cause the battery cell to short circuit, exacerbate the degree of thermal runaway of the battery cell, and may even cause the battery cell to catch fire or explode, resulting in low reliability of the battery cell.

[0111] In view of this, this application provides a battery cell including a casing, an electrode assembly, and a first insulating member. The casing includes a first wall. The electrode assembly is disposed within the casing and includes electrode sheets with flat areas, which are stacked along a first direction. The first insulating member is disposed between the first wall and the electrode assembly. A boss is formed on the side of the first insulating member facing the electrode assembly, and the boss is disposed at at least one end of the first insulating member in a second direction. A groove corresponding to the position of the boss is formed on the side of the first insulating member away from the electrode assembly. The second direction, the first direction, and the thickness direction of the first wall are all perpendicular to each other. A first reinforcing rib is disposed in the groove, and the length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall intersects the second direction. Because the length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall intersects the second direction, the risk of the first reinforcing rib piercing the insulating member between the electrode sheets is low, that is, the risk of short circuit in the battery cell is low, and the reliability of the battery cell is high.

[0112] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0113] Electrical devices include, but are not limited to: electric vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0114] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0115] Please refer to the image. Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0116] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0117] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0118] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a battery cell 12 and a housing 11, with the battery cell 12 housed within the housing 11.

[0119] The housing 11 is a component that houses the battery cell 12, providing a space for the battery cell 12. The housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first housing 111 and a second housing 112, which overlap each other to define a space for accommodating the battery cell 12. The first housing 111 and the second housing 112 can have various shapes, such as cuboid or cylindrical. The first housing 111 can be a hollow structure with an opening on one side, and the second housing 112 can also be a hollow structure with an opening on one side. The opening side of the second housing 112 overlaps the opening side of the first housing 111, thus forming a housing 11 with a accommodating space. Alternatively, the first housing 111 can be a hollow structure with an opening on one side, and the second housing 112 can be a plate-like structure, overlapping the opening side of the first housing 111, thus forming a housing 11 with a accommodating space. The first housing 111 and the second housing 112 can be sealed by a sealing element, such as a sealing ring or sealant.

[0120] In the battery device 100, there can be one or more battery cells 12. If there are multiple battery cells 12, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 12 are connected in both series and parallel. Alternatively, multiple battery cells 12 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 11. Another option is that all battery cells 12 can be directly connected in series, in parallel, or in a mixed configuration, and then the whole consisting of all battery cells 12 is housed within the housing 11.

[0121] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 12 provided in some embodiments of this application. The battery cell 12 may include a housing 121 and an electrode assembly 122, the electrode assembly 122 being housed within the housing 121.

[0122] In some embodiments, the housing 121 may include a housing 1212 and an end cap 1211, the housing 1212 having an opening and the end cap 1211 closing the opening of the housing 1212.

[0123] The housing 1212 is a component used to house the electrode assembly 122. The housing 1212 can be a hollow structure with an opening at one end, or a hollow structure with openings at both opposite ends. The housing 1212 can have various shapes, such as cylindrical or cuboid. The housing 1212 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 122 can be partially or completely located within the housing 1212.

[0124] End cap 1211 is a component that closes the opening of housing 1212 to isolate the internal environment of battery cell 12 from the external environment. End cap 1211 and housing 1212 together define a receiving space for accommodating electrode assembly 122, electrolyte, and other components. End cap 1211 can be connected to housing 1212 by welding or roll sealing to close the opening of housing 1212. The shape of end cap 1211 can be adapted to the shape of housing 1212. For example, if housing 1212 is a cuboid structure, end cap 1211 can be a rectangular plate structure adapted to housing 1212; or if housing 1212 is a cylindrical structure, end cap 1211 can be a circular plate structure adapted to housing 1212. The material of end cap 1211 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The materials of end cap 1211 and housing 1212 can be the same or different.

[0125] In an embodiment where the housing 1212 has an opening at one end, one end cap 1211 may be provided accordingly. In an embodiment where the housing 1212 has openings at opposite ends, two end caps 1211 may be provided accordingly. The two end caps 1211 respectively close the two openings of the housing 1212, and the two end caps 1211 and the housing 1212 together define the receiving space.

[0126] In some embodiments, the battery cell 12 may further include electrode terminals 125, which are disposed on the housing 121 and are used for electrical connection with the tabs 1224 of the electrode assembly 122 to input or output electrical energy of the battery cell 12. The electrode terminals 125 may be disposed on the housing 1212 of the housing 121 or on the end cap 1211 of the housing 121. The electrode terminals 125 and the tabs 1224 may be directly connected, for example, by welding. The electrode terminals 125 and the tabs 1224 may also be indirectly connected, for example, through a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy. Exemplarily, the electrode terminals 125 may be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. Of course, in some embodiments, the electrode terminal 125 may also be a composite material, that is, the electrode terminal 125 is formed by connecting two different metal materials together, such as hot pressing or cold pressing.

[0127] In some embodiments, the battery cell 12 may further include a pressure relief mechanism 126, which may be disposed on the end cap 1211 or the housing 1212. The pressure relief mechanism 126 may be a pressure relief component installed on the housing 1212 or the end cap 1211, such as an explosion-proof plate or a safety valve. The pressure relief mechanism 126 may also be integrally formed with the end cap 1211 or the housing 1212. The pressure relief mechanism 126 may have a pressure relief groove to allow the battery cell 12 to crack along the groove when pressure is released. The pressure relief groove may be a groove extending along a closed trajectory, such as a circular trajectory, a rectangular trajectory, etc.; the pressure relief groove may also be a groove extending along a non-closed trajectory, such as an H-shaped trajectory, a Y-shaped trajectory, a V-shaped trajectory, a U-shaped trajectory, etc.

[0128] According to some embodiments of this application, please refer to Figure 3-Figure 7 The battery cell 12 includes a housing 121, an electrode assembly 122, and a first insulating member 123. The housing 121 includes a first wall 1210. The electrode assembly 122 is disposed within the housing 121 and includes an electrode sheet having a flat region 1221, which is stacked along a first direction X. The first insulating member 123 is disposed between the first wall 1210 and the electrode assembly 122. A boss 1231 is formed on the side of the first insulating member 123 facing the electrode assembly 122. The boss 1231 is located at at least one end of the first insulating member 123 in a second direction Y. A groove 1232 corresponding to the position of the boss 1231 is formed on the side of the first insulating member 123 away from the electrode assembly 122. The second direction Y, the first direction X, and the thickness direction Z of the first wall are all perpendicular to each other. The groove 1232 is provided with a first reinforcing rib 1233, and the length direction of the orthogonal projection of the first reinforcing rib 1233 on the plane perpendicular to the thickness direction Z of the first wall intersects with the second direction Y.

[0129] In some embodiments, the electrode assembly 122 further includes an insulating member 1227, and the positive electrode 1225, the insulating member 1227 and the negative electrode 1226 are stacked together.

[0130] In some embodiments, the housing 121 can be a sealed structure or a non-sealed structure. As an example, when the housing 121 is a sealed structure, it can protect the electrode assembly 122 and prevent, to some extent, electrolyte leakage. When the housing 121 is a non-sealed structure, it can still protect the electrode assembly 122, and a sealing bag may be included between the housing 121 and the electrode assembly 122. The sealing bag is used to encapsulate the electrode assembly 122 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0131] The first wall 1210 can be any wall portion of the outer casing 121. There can be one or more first walls 1210. In embodiments where there are multiple first walls 1210, there can be multiple electrode terminals 125, each including a positive terminal and a negative terminal. The positive terminal and the negative terminal can be located on two different first walls 1210, or both the positive terminal and the negative terminal can be located on one of the first walls 1210.

[0132] There can be multiple electrode terminals 125 or just one. In an embodiment where there is only one electrode terminal 125, the electrode terminal 125 serves as one output terminal of the battery cell 12, and the housing 121 can serve as the other output terminal of the battery cell 12.

[0133] In some embodiments, the first insulating member 123 is provided with a through hole 1235, the through hole 1235 corresponds to the position of the electrode terminal 125, and at least a portion of the electrode terminal 125 passes through the through hole 1235 and is connected to the power lead-out portion.

[0134] In some embodiments, the first wall 1210 may be the wall with the largest outer surface area in the housing 1212, or the first wall 1210 may not be the wall with the largest outer surface area in the housing 1212.

[0135] In some embodiments, the first wall 1210 is an end cap 1211. The end cap 1211 closes the opening of the housing 1212. For example, Figure 6 and Figure 7 Along the thickness direction of the end cap 1211, the end cap 1211 has an inner surface facing the electrode assembly 122, an outer surface facing away from the electrode assembly 122, and an outer peripheral surface connecting the inner surface and the outer surface. The outer peripheral surface connects to the inner peripheral surface of the housing 1212, closing the opening of the housing 1212. In other embodiments, the housing 1212 has an end face connecting its outer peripheral surface and inner peripheral surface, and the inner surface of the end cap 1211 connects to the end face, closing the opening of the housing 1212.

[0136] Electrode assembly 122 is located within the receiving space defined by housing 1212 and end cap 1211. Electrode assembly 122 can be a stacked structure or a wound structure. There can be one or more electrode assemblies 122 in housing 1212. If there are multiple electrode assemblies 122, they can be stacked. For example, multiple electrode assemblies 122 can be stacked along the stacking direction of the flat region 1221 of the electrode sheet of one of the electrode assemblies 122. The flat region 1221 is the flat portion of the electrode sheet of electrode assembly 122. If electrode assembly 122 is a stacked structure, the electrode assembly 122 is a stacked electrode assembly, and the entire electrode sheet of electrode assembly 122 can be a flat region 1221. If electrode assembly 122 is a wound structure, the electrode sheet of electrode assembly 122 also has a corner region 1222, and the corner region 1222 is provided at least one end of the electrode sheet along the direction intersecting with the flat region 1221.

[0137] In some embodiments, the electrode assembly 122 includes a body 1223 and a tab 1224. The tab 1224 is disposed at one end of the body 1223, and the power lead-out portion can be the tab 1224. The body 1223 is the main component of the electrode assembly 122 that undergoes electrochemical reaction in the battery cell 12. Exemplarily, the tab 1224 is connected to the end of the body 1223 facing the wall in the thickness direction Z of the first wall, that is, in the thickness direction Z of the first wall, the tab 1224 is located between the body 1223 and the first wall 1210, so that the tab 1224 can be connected to the electrode terminal 125 through the current collector. It should be noted that the tab 1224 of the electrode assembly 122 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If tab 1224 is used as the positive electrode of output electrode assembly 122, then tab 1224 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if tab 1224 is used as the negative electrode of output electrode assembly 122, then tab 1224 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0138] In some embodiments, two bosses 1231 are provided, located at both ends of the first insulating member 123 along the second direction Y. By pressing the electrode assembly 122 against the bosses 1231, the risk of the electrode assembly 122 shaking can be reduced, that is, the bosses 1231 restrict the space available for the electrode assembly 122 to move within the housing 121.

[0139] In some embodiments, the boss 1231 abuts against the electrode assembly 122, and the boss 1231 can provide a certain supporting force to the electrode assembly 122. In the event of thermal runaway of the battery cell 12, the amplitude of the shaking of the electrode assembly 122 can be effectively reduced, thereby reducing the risk of short circuit between the electrode assembly 122 and the casing 121.

[0140] The groove 1232 can refer to a through hole that penetrates the first insulating member 123 along the thickness direction Z of the first wall, or it can refer to a recess formed on the side of the first insulating member 123 away from the electrode assembly 122.

[0141] In some embodiments, the dimension of the groove 1232 along the first direction X is larger than the dimension of the groove 1232 along the second direction Y. This arrangement allows for more space in the second direction Y to facilitate the connection between the tab 1224 and the electrode terminal 125 or the connection between the adapter 124 and the electrode terminal 125.

[0142] In some embodiments, the orthographic projection of the electrode assembly 122 at least partially overlaps with the groove 1232 in a plane perpendicular to the thickness direction Z of the first wall.

[0143] In some embodiments, the electrode assembly 122 is a wound structure, and in a plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the straight area 1221 of the electrode sheet of the electrode assembly 122 at least partially overlaps with the groove 1232, and / or, the orthographic projection of the corner area 1222 of the electrode sheet of the electrode assembly 122 at least partially overlaps with the groove 1232.

[0144] The length direction of the orthographic projection of the first reinforcing rib 1233 onto the plane perpendicular to the thickness direction Z of the first wall intersects the second direction Y, meaning that the length direction of the orthographic projection of the first reinforcing rib 1233 onto the plane perpendicular to the thickness direction Z of the first wall is parallel to or at a certain angle to the second direction Y.

[0145] In some embodiments, the length direction of the orthographic projection of the plane perpendicular to the thickness direction Z of the first wall forms a certain angle with both the first direction X and the second direction Y. For example, in some embodiments, the groove 1232 includes a first sidewall 12321 and a second sidewall 12322 spaced apart along the first direction X, and a third sidewall 12323 and a fourth sidewall 12324 spaced apart along the second direction Y. The two ends of a portion of the plurality of first reinforcing ribs 1233 are respectively connected to the third sidewall 12323 and the second sidewall 12322, the two ends of a portion of the first reinforcing ribs 1233 are respectively connected to the third sidewall 12323 and the fourth sidewall 12324, and the two ends of a portion of the first reinforcing ribs 1233 are respectively connected to the first sidewall 12321 and the fourth sidewall 12324.

[0146] In the technical solution of this application embodiment, since the length direction of the orthogonal projection of the first reinforcing rib 1233 on the plane perpendicular to the thickness direction Z of the first wall intersects with the second direction Y, the risk of the first reinforcing rib 1233 piercing the separator 1227 when inserted between the electrode sheets is low, that is, the risk of short circuit of the battery cell 12 is low, and the reliability of the battery cell 12 is high.

[0147] According to some embodiments of this application, please refer to Figure 3-Figure 7 The length direction of the orthographic projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the first direction X.

[0148] In some embodiments, along the thickness direction Z of the first wall, the orthographic projection of the first reinforcing rib 1233 overlaps with the orthographic projection of the plurality of pole pieces.

[0149] In the above scheme, since the length direction of the orthogonal projection of the first reinforcing rib 1233 on the plane perpendicular to the thickness direction Z of the first wall is parallel to the first direction X, the stress points between the first reinforcing rib 1233 and each electrode sheet of the electrode assembly 122 are distributed along the first direction X, which helps to reduce the risk of torsion and deformation of the electrode assembly 122, and the electrode assembly 122 has high structural stability.

[0150] According to some embodiments of this application, please refer to Figures 3-9 The thickness of the first reinforcing rib 1233 is H1, which satisfies 0.1mm≤H1≤3mm.

[0151] The thickness of the first reinforcing rib 1233 can be any value between 0.1 mm and 3 mm, for example, any one of the following values ​​or a range between any two: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm.

[0152] In some embodiments, the length direction of the orthogonal projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the first direction X, and the thickness of the first reinforcing rib 1233 is the dimension of the first reinforcing rib 1233 in the second direction Y.

[0153] In the above scheme, when H1≥0.1mm, the thickness of the first reinforcing rib 1233 is relatively large, and its resistance to deformation is strong, and the first insulating component 123 has high structural stability; when H1≤3mm, the first reinforcing rib 1233 not only improves the strength of the first insulating component 123, but also has a small mass, and the battery cell 12 has a high energy density; therefore, when 0.1mm≤H1≤3mm, the battery cell 12 can have high structural stability and high energy density.

[0154] According to some embodiments of this application, please refer to Figures 3-9 The groove 1232 includes a first sidewall 12321 and a second sidewall 12322 spaced apart along the first direction X, and the two ends of the first reinforcing rib 1233 are respectively connected to the first sidewall 12321 and the second sidewall 12322.

[0155] In some embodiments, the first insulating member 123 includes a substrate with a through hole. A first sidewall 12321 and a second sidewall 12322 are spaced apart along a first direction X and extend along the edge of the through hole in the first direction X. The first sidewall 12321 and the second sidewall 12322 protrude from the substrate, that is, the first sidewall 12321, the second sidewall 12322 and the substrate together define a groove 1232, and the first sidewall 12321 and the second sidewall 12322 are spaced apart from the end opposite to the substrate. In other embodiments, the ends of the first sidewall 12321 and the second sidewall 12322 opposite to the substrate are connected by a bottom wall.

[0156] Since the first reinforcing rib 1233 is connected to the first sidewall 12321 and the second sidewall 12322 at both ends, the risk of deformation of the first sidewall 12321 and the second sidewall 12322 is low, and the local rigidity of the groove 1232 is high.

[0157] In the above scheme, when the two ends of the first reinforcing rib 1233 are respectively connected to the first sidewall 12321 and the second sidewall 12322, on the one hand, the local rigidity of the groove 1232 can be effectively improved, and the structural strength of the area where the groove 1232 is provided in the first insulating member 123 can be improved. On the other hand, in the embodiment of injection molding of the first insulating member 123, the flow channels corresponding to the first sidewall 12321, the second sidewall 12322 and the first reinforcing rib 1233 can be formed in the mold, which is conducive to the flow and filling of the injection material, thereby reducing the injection pressure, shortening the filling time of the injection material and improving production efficiency. It can also make the distribution of the injection material more uniform during the injection process, and reduce the risk of stress concentration in the first insulating member 123 after molding.

[0158] According to some embodiments of this application, please refer to Figures 3-9Multiple first reinforcing ribs 1233 are provided, and the multiple first reinforcing ribs 1233 are spaced apart along the second direction Y.

[0159] In some embodiments, a plurality of first reinforcing ribs 1233 are arranged in parallel. In other embodiments, the plurality of first reinforcing ribs 1233 are arranged in parallel, and the length direction of the orthographic projection of the first reinforcing ribs 1233 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the first direction X and perpendicular to the second direction Y. The groove 1232 includes a first sidewall 12321 and a second sidewall 12322 spaced apart along the first direction X, and a third sidewall 12323 and a fourth sidewall 12324 spaced apart along the second direction Y. The two ends of the first reinforcing ribs 1233 are respectively connected to the first sidewall 12321 and the second sidewall 12322. This arrangement makes the force distribution of the groove 1232 more uniform when it is subjected to force.

[0160] In the above scheme, setting multiple first reinforcing ribs 1233 can further improve the structural strength of the first insulating component 123.

[0161] According to some embodiments of this application, please refer to Figures 3-9 Along the second direction Y, the distance D between two adjacent first reinforcing ribs 1233 satisfies 0.5mm≤D≤3mm.

[0162] The thickness of the first reinforcing rib 1233 can be any value between 0.5mm and 3mm, for example, any one of the following values ​​or a range between any two: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm.

[0163] In the above scheme, when D≥0.5mm, in the embodiment of injection molding the first insulating part 123, the distance between two adjacent first reinforcing ribs 1233 is relatively large. During the molding process of the first insulating part 123, the flowability of the injection molding material is good, which helps to reduce the risk of stress concentration in the first insulating part 123 after molding, and makes the first insulating part 123 have high structural stability. When D≤3mm, the distance between two adjacent first reinforcing ribs 1233 is small, and a relatively large number of first reinforcing ribs 1233 can be distributed in the groove 1232, which helps to improve the strength of the area where the groove 1232 is set in the first insulating part 123. Therefore, when 0.5mm≤D≤3mm, the first insulating part 123 can take into account both high structural stability and high strength.

[0164] According to some embodiments of this application, please refer to Figures 3-9 The groove 1232 includes a third sidewall 12323 and a fourth sidewall 12324 spaced apart along the second direction Y. Along the second direction Y, the thickness of the third sidewall 12323 is H2, satisfying 0.1mm ≤ H2 ≤ 3mm; and / or, along the second direction Y, the thickness of the fourth sidewall 12324 is H3, satisfying 0.1mm ≤ H3 ≤ 3mm.

[0165] The thickness of the third sidewall 12323 can be any value between 0.1 mm and 3 mm, for example, any one of the following values ​​or a range between any two: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm.

[0166] The thickness of the fourth sidewall 12324 can be any value between 0.1 mm and 3 mm, for example, any one of the following values ​​or a range between any two: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm.

[0167] In the above scheme, when H2≥0.1mm, the thickness of the third sidewall 12323 is relatively large, the groove 1232 has a strong resistance to deformation, and the groove 1232 has high structural strength, thereby enabling the first insulating component 123 to have high structural strength; when H2≤3mm, the thickness of the third sidewall 12323 is relatively small, the overall weight of the first insulating component 123 is relatively light, and the battery cell 12 has high energy density; when 0.1mm≤H2≤3mm, the first insulating component 123 has high structural strength, and the battery cell 12 has high energy density.

[0168] When H3 ≥ 0.1 mm, the thickness of the fourth sidewall 12324 is relatively large, the groove 1232 has a strong resistance to deformation, and the groove 1232 has high structural strength, which in turn makes the first insulating member 123 have high structural strength; when H3 ≤ 3 mm, the thickness of the fourth sidewall 12324 is relatively small, the overall weight of the first insulating member 123 is relatively light, and the battery cell 12 has high energy density; when 0.1 mm ≤ H3 ≤ 3 mm, the battery cell 12 has high energy density while the first insulating member 123 has high structural strength.

[0169] According to some embodiments of this application, please refer to Figures 3-9 , 0.2mm≤H2≤2mm; and / or 0.2mm≤H3≤2mm.

[0170] The thickness of the third sidewall 12323 can be any value between 0.2 mm and 2 mm, for example, any one of the following values ​​or a range between any two: 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0171] The thickness of the fourth sidewall 12324 can be any value between 0.2 mm and 2 mm, for example, any one of the following values ​​or a range between any two: 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0172] In the above scheme, when H2≥0.2mm, the thickness of the third sidewall 12323 is further increased, the ability of the groove 1232 to resist deformation is further strengthened, which is conducive to further improving the structural strength of the groove 1232, and thus conducive to further improving the structural strength of the first insulating member 123; when H2≤2mm, the thickness of the third sidewall 12323 is further reduced, the overall weight of the first insulating member 123 is further reduced, and the energy density of the battery cell 12 is further improved; when 0.2mm≤H2≤2mm, while further improving the structural strength of the first insulating member 123, the energy density of the battery cell 12 can also be further improved.

[0173] When H3 ≥ 0.2 mm, the thickness of the third sidewall 12323 is further increased, and the ability of the groove 1232 to resist deformation is further strengthened, which is conducive to further improving the structural strength of the groove 1232, and thus conducive to further improving the structural strength of the first insulating member 123; when H3 ≤ 2 mm, the thickness of the third sidewall 12323 is further reduced, and the overall weight of the first insulating member 123 is further reduced, which further improves the energy density of the battery cell 12; when 0.2 mm ≤ H3 ≤ 2 mm, while further improving the structural strength of the first insulating member 123, the energy density of the battery cell 12 can also be further improved.

[0174] According to some embodiments of this application, please refer to Figures 3-9 The thickness of the bottom wall of groove 1232 is H4, which satisfies 0.1mm≤H4≤3mm.

[0175] The thickness of the bottom wall of groove 1232 can be any value between 0.1mm and 3mm, for example, any one of the following values ​​or a range between any two: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm.

[0176] In the above design, since the groove 1232 is located on the bottom wall, on the one hand, the force distribution is more uniform when the boss 1231 contacts the electrode assembly 122, which helps reduce the risk of stress concentration and thus improves the structural stability of the battery cell 12. On the other hand, the bottom wall design prevents the first reinforcing rib 1233 from directly contacting the electrode assembly 122, reducing the risk of the first reinforcing rib 1233 inserting between the electrodes and puncturing the separator 1227 during the assembly of the battery cell 12. Furthermore, in the event of thermal runaway of the battery cell 12, at least part of the bottom wall needs to be melted to allow the first reinforcing rib 1233 to directly contact the electrode assembly 122, further reducing the risk of the first reinforcing rib 1233 inserting between the electrodes and puncturing the separator 1227 during thermal runaway of the battery cell 12. This further improves the reliability of the battery cell 12.

[0177] When H4 ≥ 0.1 mm, the bottom wall thickness of the groove 1232 is relatively large, the structural strength of the groove 1232 is relatively high, the risk of deformation of the groove 1232 is relatively low, and the first insulating component 123 has high structural stability. When H4 ≤ 3 mm, the bottom wall thickness of the groove 1232 is relatively small, the overall weight of the first insulating component 123 is relatively light, which is conducive to enabling the battery cell 12 to have a higher energy density. When 0.1 mm ≤ H4 ≤ 3 mm, it is conducive to enabling the first insulating component 123 to have high structural stability while enabling the battery cell 12 to have a higher energy density.

[0178] According to some embodiments of this application, please refer to Figures 3-9 , 0.2mm≤H4≤2mm.

[0179] The thickness of the bottom wall of the groove 1232 can be any value between 0.2mm and 2mm, for example, any one of the following values ​​or a range between any two: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm.

[0180] In the above scheme, when H4≥0.2mm, the further increase in the bottom wall of the groove 1232 is beneficial to further improve the structural strength of the groove 1232, thereby further improving the structural stability of the first insulating member 123; when H4≤2mm, the thickness of the bottom wall of the groove 1232 is further reduced, and the overall weight of the first insulating member 123 is lighter, which is beneficial to enable the battery cell 12 to have a higher energy density; when 0.2mm≤H4≤2mm, it is beneficial to further improve the structural stability of the first insulating member 123 while further improving the energy density of the battery cell 12.

[0181] According to some embodiments of this application, please refer to Figure 10 The groove 1232 penetrates the first insulating member 123 along the thickness direction Z of the first wall.

[0182] The groove 1232 penetrates the first insulating member 123 along the thickness direction Z of the first wall. That is, the side wall of the groove 1232 and the first reinforcing rib 1233 are used together to support the electrode assembly 122, saving the space occupied by the bottom wall in the thickness direction Z of the first wall.

[0183] In the above scheme, since the length direction of the orthographic projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall intersects with the second direction Y, the groove 1232 penetrates the first insulating member 123 along the thickness direction Z of the first wall. This reduces the risk of the first reinforcing rib 1233 puncturing the separator 1227 when inserted between the electrodes, and gives the first insulating member 123 higher structural strength, while also eliminating the need for components to seal the groove 1232, thus improving the energy density of the battery cell 12.

[0184] According to some embodiments of this application, at least one end of the first reinforcing rib 1233 extends beyond the electrode assembly 122 along the first direction X.

[0185] In some embodiments, both ends of the first reinforcing rib 1233 extend beyond the electrode assembly 122 along the first direction X.

[0186] In the above scheme, since at least one end of the first reinforcing rib 1233 extends beyond the electrode assembly 122 along the first direction X, the first reinforcing rib 1233 has a stronger ability to resist the shaking of the electrode assembly 122, which can further improve the structural stability of the battery cell 12.

[0187] According to some embodiments of this application, the first reinforcing rib 1233 and the first insulating member 123 are integrally formed.

[0188] In some embodiments, the first reinforcing rib 1233 and the first insulating member 123 are injection molded.

[0189] In the above solution, the first reinforcing rib 1233 and the first insulating component 123 are integrally formed, resulting in a more uniform stress distribution and higher structural stability for the first insulating component 123. This also simplifies the assembly process of the battery cell 12 and shortens the assembly cycle time.

[0190] According to some embodiments of this application, please refer to Figure 10 A second reinforcing rib 1234 is also provided in the groove 1232, and the second reinforcing rib 1234 intersects with the first reinforcing rib 1233.

[0191] In some embodiments, the length direction of the orthographic projection of the second reinforcing rib 1234 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the second direction Y, and the length direction of the orthographic projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the first direction X. In this embodiment, although the length direction of the orthographic projection of the second reinforcing rib 1234 onto a plane perpendicular to the thickness direction Z of the first wall is parallel to the second direction Y, because it intersects with the first reinforcing rib 1233, under the constraint of the first reinforcing rib 1233, not only is the risk of the second reinforcing rib 1234 puncturing the spacer 1227 when inserted between the electrodes reduced, but the strength of the groove 1232 is also increased simultaneously. In other embodiments, along the direction from the first wall 1210 to the electrode assembly 122, the surface of the second reinforcing rib 1234 facing the electrode assembly 122 does not exceed the surface of the first reinforcing rib 1233 facing the electrode assembly 122. In this embodiment, the risk of the second reinforcing rib 1234 puncturing the spacer 1227 when inserted between the electrodes can be further reduced.

[0192] In some embodiments, the second reinforcing rib 1234 and the first reinforcing rib 1233 are arranged in a cross shape. In other embodiments, multiple second reinforcing ribs 1234 and multiple first reinforcing ribs 1233 are provided, and the multiple second reinforcing ribs 1234 and multiple first reinforcing ribs 1233 are arranged in a grid pattern.

[0193] In the above scheme, the length direction of the orthographic projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall intersects with the second direction Y. A second reinforcing rib 1234 is also provided in the groove 1232, and the second reinforcing rib 1234 intersects with the first reinforcing rib 1233. The provision of the first reinforcing rib 1233 reduces the risk of the first reinforcing rib 1233 and the second reinforcing rib 1234 puncturing the separator 1227 when inserted between the electrode sheets. The provision of the second reinforcing rib 1234 can further improve the structural strength of the area where the first insulating member 123 is provided in the groove 1232, thereby improving the structural stability of the first insulating member 123.

[0194] According to some embodiments of this application, the electrode assembly 122 has a stacked structure.

[0195] In the above scheme, since all areas of the electrode assembly 122 of the stacked structure are flat areas, setting the length direction of the orthogonal projection of the first reinforcing rib 1233 on the plane perpendicular to the thickness direction Z of the first wall to intersect with the second direction Y can significantly reduce the risk of the first reinforcing rib 1233 piercing the separator 1227 when inserted between the electrode sheets, thereby enabling the battery cell 12 to have higher reliability.

[0196] According to some embodiments of this application, please refer to Figures 3-9The electrode assembly 122 has a wound structure and also has a corner region 1222. The straight region 1221 has a corner region 1222 at at least one end along the second direction Y.

[0197] In the above scheme, since the stacking direction of the flat area 1221 of the electrode assembly 122 of the wound structure is the first direction X, setting the length direction of the orthographic projection of the first reinforcing rib 1233 in the plane perpendicular to the thickness direction Z of the first wall to intersect with the second direction Y can significantly reduce the risk of the first reinforcing rib 1233 piercing the separator 1227 when inserted between the flat areas 1221 of the electrode, thereby giving the battery cell 12 higher reliability. Meanwhile, in embodiments where the size of the groove 1232 along the first direction X is larger than the size of the groove 1232 along the second direction Y, setting the length direction of the orthographic projection of the first reinforcing rib 1233 in the plane perpendicular to the thickness direction Z of the first wall to intersect with the second direction Y, compared to embodiments where the length direction of the orthographic projection of the first reinforcing rib 1233 in the plane perpendicular to the thickness direction Z of the first wall is parallel to the second direction Y, the length of the first reinforcing rib 1233 is longer, and the risk of piercing the separator 1227 when inserted between the electrode located in the flat area 1221 and / or located in the corner area 1222 is lower. Therefore, this configuration can improve the reliability of the battery cell 12.

[0198] According to some embodiments of this application, please refer to Figure 3 and Figure 5 The battery cell 12 also includes a pressure relief mechanism 126, which is disposed on the first wall 1210.

[0199] In some embodiments, the first insulating member 123 is provided with a drain hole 1236 extending through its thickness direction. The drain hole 1236 corresponds to the position of the pressure relief mechanism 126. When the battery cell 12 experiences thermal runaway, some of the emissions can pass through the drain hole 1236 and be discharged from the battery cell 12 via the pressure relief mechanism 126, thereby improving the pressure relief efficiency and reducing the risk that the first insulating member 123 will rapidly melt and fail due to excessively high internal temperature of the battery cell 12 caused by untimely pressure relief.

[0200] In the above scheme, when the battery cell 12 experiences thermal runaway, the gas is discharged by the pressure relief mechanism 126 located on the first wall 1210. In the later stages of thermal runaway, the internal pressure of the battery cell 12 is greater than its external pressure, and the electrode assembly 122 tends to move closer to the first wall 1210. At this time, the electrode assembly 122 presses against the first insulating member 123, increasing the risk of the first reinforcing rib 1233 inserting into the electrode plates. Setting the length direction of the orthogonal projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction Z of the first wall to intersect with the second direction Y can significantly reduce the risk of the first reinforcing rib 1233 inserting into the electrode plates.

[0201] According to some embodiments of this application, please refer to Figure 8 The first reinforcing rib 1233 has a dimension of L1 along the first direction X, and the boss 1231 has a dimension of L2 along the first direction X, satisfying: 0.5≤L1 / L2≤0.99.

[0202] The dimension of the first reinforcing rib 1233 along the first direction X is smaller than the dimension of the boss 1231 along the first direction X. This means that at least one end of the first reinforcing rib 1233 will be connected to the wall of the groove 1232. During the injection molding process of the first insulating part 123, the first reinforcing rib 1233 and the wall of the groove 1232 can form a flow channel that is connected to each other in the mold, which is conducive to the flow and filling of the injection molding material, thereby reducing the injection pressure and reducing the difficulty of controlling various process parameters during injection molding.

[0203] The ratio of the dimension of the first reinforcing rib 1233 along the first direction X to the dimension of the boss 1231 along the first direction X can be any value between 0.5 and 0.99, for example, any one of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, or any range between the two.

[0204] In the above scheme, when L1 / L2≥0.5, the first reinforcing rib 1233 can apply a certain supporting force to most areas of the electrode assembly 122, which can reduce the risk of the electrode assembly 122 shaking and thus improve the structural stability of the battery cell 12; when L1 / L2≤0.99, the arrangement of the first reinforcing rib 1233 is relatively easy, that is, the battery cell 12 has a lower processing difficulty; therefore, when 0.5≤L1 / L2≤0.99, the structural stability of the battery cell 12 can be improved while the battery cell 12 has a lower processing difficulty.

[0205] According to some embodiments of this application, please refer to Figure 8 , 0.7≤L1 / L2≤0.99.

[0206] The ratio of the dimension of the first reinforcing rib 1233 along the first direction X to the dimension of the boss 1231 along the first direction X can be any value between 0.7 and 0.99, for example, any one of the following values ​​or a range between any two: 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99.

[0207] In the above scheme, when L1 / L2≥0.7, the area where the first reinforcing rib 1233 can apply a supporting force to the electrode assembly 122 can be further increased, further reducing the risk of the electrode assembly 122 shaking, and thus further improving the structural stability of the battery cell 12; when L1 / L2≤0.99, the arrangement difficulty of the first reinforcing rib 1233 is relatively low, that is, the battery cell 12 has a lower processing difficulty; therefore, when 0.7≤L1 / L2≤0.99, the structural stability of the battery cell 12 can be further improved while the battery cell 12 has a lower processing difficulty.

[0208] According to some embodiments of this application, please refer to Figure 2 This application provides a battery device 100, which includes the battery cell 12 in one or more of the above embodiments.

[0209] In the above scheme, since the battery cell 12 in one or more of the above embodiments has high reliability, the battery device 100 including the battery cell 12 in one or more of the above embodiments also has high reliability.

[0210] According to some embodiments of this application, please refer to Figure 1 This application provides an electrical device that includes a battery cell 12 or a battery device 100 as described in one or more of the above embodiments, wherein the battery cell 12 or the battery device 100 is used to provide electrical energy.

[0211] In the above solutions, since the battery cell 12 or battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery cell 12 or battery device 100 in one or more of the above embodiments also has high reliability.

[0212] According to some embodiments of this application, please refer to Figures 3-9 This application provides a battery cell 12, which includes a housing 121, an electrode assembly 122, a first insulating member 123, and a pressure relief mechanism 126. The housing 121 includes a shell 1212 and an end cap 1211, which closes the opening of the shell 1212. The pressure relief mechanism 126 is disposed on the end cap 1211. The electrode assembly 122 is disposed inside the housing 121 and includes an electrode sheet having a flat region 1221, which is stacked along a first direction X.

[0213] A first insulating member 123 is disposed between the end cap 1211 and the electrode assembly 122. A boss 1231 is formed on the side of the first insulating member 123 facing the electrode assembly 122. The boss 1231 is disposed at at least one end of the first insulating member 123 in the second direction Y. A groove 1232 corresponding to the position of the boss 1231 is formed on the side of the first insulating member 123 away from the electrode assembly 122. The second direction Y, the first direction X, and the thickness direction of the end cap 1211 are perpendicular to each other. A first reinforcing rib 1233 is disposed in the groove 1232. The length direction of the orthographic projection of the first reinforcing rib 1233 onto a plane perpendicular to the thickness direction of the end cap 1211 is parallel to the first direction X.

[0214] The groove 1232 includes a first sidewall 12321 and a second sidewall 12322 spaced apart along a first direction X, a third sidewall 12323 and a fourth sidewall 12324 spaced apart along a second direction Y, and a bottom wall. The first sidewall 12321, the second sidewall 12322, the third sidewall 12323, and the fourth sidewall 12324 surround the bottom wall. A first reinforcing rib 1233 is connected at both ends to the first sidewall 12321 and the second sidewall 12322, respectively. Multiple first reinforcing ribs 1233 are provided, spaced apart along the second direction Y. The first reinforcing ribs 1233 are integrally formed with the first insulating member 123.

[0215] In the later stages of thermal runaway of the battery cell 12, the emissions are discharged through the pressure relief mechanism 126 located on the end cap 1211. Because the pressure inside the housing 121 is greater than the pressure outside the housing 121, the electrode assembly 122 tends to move towards the end cap 1211. The high-temperature electrode assembly 122 will compress the first insulating member 123. At this time, even if the bottom wall melts, because the length direction of the orthogonal projection of the first reinforcing rib 1233 onto the plane perpendicular to the thickness direction of the end cap 1211 is parallel to the first direction X, the first reinforcing rib 1233 can continue to support the electrode assembly 122. The risk of the first reinforcing rib 1233 inserting into the electrode plates is low, meaning the risk of the first reinforcing rib 1233 puncturing the separator and causing a short circuit in the battery cell 12 is low, and the reliability of the battery cell 12 is high.

[0216] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; An electrode assembly is disposed within the housing. The electrode assembly includes an electrode sheet, the electrode sheet having a flat region, and the flat region being stacked along a first direction. A first insulating member is disposed between the first wall and the electrode assembly. A boss is formed on the side of the first insulating member facing the electrode assembly. The boss is disposed at at least one end of the first insulating member in a second direction. A groove corresponding to the position of the boss is formed on the side of the first insulating member away from the electrode assembly. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other. The groove is provided with a first reinforcing rib, and the length direction of the first reinforcing rib, which is the orthogonal projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall, intersects with the second direction.

2. The battery cell according to claim 1, characterized in that, The length direction of the orthographic projection of the first reinforcing rib onto a plane perpendicular to the thickness direction of the first wall is parallel to the first direction.

3. The battery cell according to claim 1, characterized in that, The thickness of the first reinforcing rib is H1, which satisfies 0.1mm≤H1≤3mm.

4. The battery cell according to claim 1, characterized in that, The groove includes a first sidewall and a second sidewall spaced apart along the first direction, and the two ends of the first reinforcing rib are respectively connected to the first sidewall and the second sidewall.

5. The battery cell according to claim 1, characterized in that, Multiple first reinforcing ribs are provided, and the multiple first reinforcing ribs are spaced apart along the second direction.

6. The battery cell according to claim 5, characterized in that, Along the second direction, the distance D between two adjacent first reinforcing ribs satisfies 0.5mm≤D≤3mm.

7. The battery cell according to claim 1, characterized in that, The groove includes a third sidewall and a fourth sidewall spaced apart along the second direction; Along the second direction, the thickness of the third sidewall is H2, which satisfies 0.1mm≤H2≤3mm; And / or, along the second direction, the thickness of the fourth sidewall is H3, satisfying 0.1mm≤H3≤3mm.

8. The battery cell according to claim 7, characterized in that, 0.2mm≤H2≤2mm; And / or, 0.2mm≤H3≤2mm.

9. The battery cell according to claim 1, characterized in that, The thickness of the bottom wall of the groove is H4, which satisfies 0.1mm≤H4≤3mm.

10. The battery cell according to claim 9, characterized in that, 0.2mm≤H4≤2mm.

11. The battery cell according to claim 1, characterized in that, The groove extends through the first insulating member along the thickness direction of the first wall.

12. The battery cell according to claim 1, characterized in that, Along the first direction, at least one end of the first reinforcing rib extends beyond the electrode assembly.

13. The battery cell according to claim 1, characterized in that, The first reinforcing rib is integrally formed with the first insulating component.

14. The battery cell according to claim 1, characterized in that, The groove is further provided with a second reinforcing rib, which intersects with the first reinforcing rib.

15. The battery cell according to claim 1, characterized in that, The electrode assembly has a stacked structure.

16. The battery cell according to claim 1, characterized in that, The electrode assembly has a wound structure and also has a corner region. The corner region is provided at least one end of the straight region along the second direction.

17. The battery cell according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on the first wall.

18. The battery cell according to claim 1, characterized in that, The first reinforcing rib has a dimension of L1 along the first direction, and the boss has a dimension of L2 along the first direction, satisfying: 0.5≤L1 / L2≤0.

99.

19. The battery cell according to claim 18, characterized in that, 0.7≤L1 / L2≤0.

99.

20. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-19.

21. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-19 or a battery device according to claim 20, wherein the battery cell or the battery device is used to provide electrical energy.

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