Battery cell, battery apparatus, and electric device

Abstract

Disclosed in the present application are a battery cell, a battery apparatus, and an electric device. The battery cell comprises a casing, an electrode assembly, an electrode terminal and a first insulating member. The casing has a first wall. The electrode assembly is arranged in the casing. The electrode terminal is arranged on the first wall and is electrically connected to the electrode assembly. At least part of the first insulating member is located between the electrode terminal and the first wall, and the first insulating member is at least partially arranged around the electrode terminal. The outer peripheral surface of the electrode terminal comprises a first flat surface, the inner peripheral surface of the first insulating member comprises a second flat surface, and the first flat surfaces and the second flat surfaces cooperate with each other to restrict the rotation of the electrode terminal relative to the first insulating member. The technical solution provided by the present application can effectively improve the reliability of the battery apparatus.

Description

Battery cells, battery packs and electrical devices Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202411455127.2, filed on October 17, 2024, entitled “Battery Cell, Battery Device and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0003] 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.

[0004] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can effectively improve the reliability of the battery device.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, electrode terminals, and a first insulating member. The housing has a first wall. The electrode assembly is disposed within the housing. The electrode terminals are disposed on the first wall and electrically connected to the electrode assembly. At least a portion of the first insulating member is located between the electrode terminals and the first wall, and at least a portion of the first insulating member surrounds the electrode terminals. The outer peripheral surface of the electrode terminals includes a first flat surface, and the inner peripheral surface of the first insulating member includes a second flat surface. The first and second flat surfaces cooperate to restrict rotation of the electrode terminals relative to the first insulating member.

[0008] In the above solution, by providing a first flat surface on the outer circumferential surface of the electrode terminal and a second flat surface that cooperates with the first flat surface on the inner circumferential surface of the first insulating member, the rotation of the electrode terminal relative to the first insulating member can be restricted, thereby achieving circumferential locking of the electrode terminal. This reduces the risk that the electrode terminal may rotate due to internal or external forces impacting the battery cell, which could damage the internal circuit structure of the battery cell and affect its reliability. In turn, this improves the reliability of the battery device.

[0009] According to some embodiments of this application, the electrode terminal includes a body and a flange, the flange protruding from the outer peripheral surface of the body, the outer peripheral surface of the body including a first flat surface.

[0010] In the above scheme, the electrode terminal includes a body and a flange. The flange can be used to restrict the movement of the electrode terminal along its axial direction to achieve the assembly relationship between the electrode terminal and the first wall. By providing a first flat surface on the outer peripheral surface of the body, an anti-rotation fit can be formed with the second flat surface of the first insulating member, thereby improving the structural stability between the electrode terminal and the first wall to a certain extent, enhancing the impact resistance of the electrode terminal, reducing the risk of the electrode terminal rotating due to impact, and thus enabling the battery cell to have higher reliability, which in turn enables the battery device to have higher reliability.

[0011] According to some embodiments of this application, the outer peripheral surface of the body includes a plurality of first flat surfaces, which are arranged circumferentially along the electrode terminals.

[0012] In the above solution, by setting multiple first flat surfaces on the outer peripheral surface of the body, the electrode terminals have multiple anti-rotation structures that cooperate with the second flat surfaces of the first insulating member, thereby effectively reducing the risk of the electrode terminals rotating relative to the first insulating member due to impact, which would damage the internal circuit structure of the battery cell. This results in higher reliability of the battery cell and, consequently, higher reliability of the battery device.

[0013] According to some embodiments of this application, a plurality of first flat surfaces are arranged at intervals along the circumference of the electrode terminals, and adjacent first flat surfaces are connected by a first arc surface.

[0014] In the above scheme, two adjacent first flat surfaces are connected by a first arc surface, so that the electrode terminals have a larger cross-sectional area, which is conducive to improving the current carrying capacity and the charging and discharging performance of the battery cells, thereby enabling the battery device to have higher charging and discharging performance.

[0015] According to some embodiments of this application, the length of the first straight surface along the circumference of the electrode terminal is not less than 2 mm and not more than 5 mm.

[0016] In the above scheme, by setting the length of the first flat surface to be no less than 2mm, the anti-rotation fit between the electrode terminal and the first insulating component can be stabilized, effectively reducing the risk of the electrode terminal rotating due to impact, thus giving the battery cell high reliability. By setting the length of the first flat surface to be no more than 5mm, the impact of setting the flat surface on the current-carrying area of ​​the electrode terminal and the structural strength of the electrode terminal can be reduced, thus giving the battery cell high charge-discharge performance and reliability. Therefore, by limiting the length of the first flat surface to be no less than 2mm and no more than 5mm, the charge-discharge performance and reliability of the battery cell can be balanced.

[0017] According to some embodiments of this application, the electrode assembly includes a positive electrode and a negative electrode. The electrode assembly has a flat region, and portions of the positive electrode and the negative electrode located in the flat region are stacked along a first direction. The first flat surface intersects with a first plane perpendicular to the first direction.

[0018] In the above scheme, as the number of charge-discharge cycles increases, the internal pressure of the battery cell increases, and the expansion force generated inside the battery cell is relatively obvious in the first direction. That is, the large surface of the battery cell is significantly affected by the expansion force. In this regard, by setting the first flat surface to intersect with the first plane perpendicular to the first direction, the risk of deformation of the first flat surface or the second flat surface due to the expansion force inside the battery cell acting on the anti-rotation interface formed by the interaction of the first flat surface and the second flat surface, which would cause the anti-rotation interface to fail, can be effectively reduced. This makes the battery cell have high reliability, and thus the battery device has high reliability.

[0019] According to some embodiments of this application, the angle between the first straight surface and the first plane is not less than 50° and not greater than 130°.

[0020] In the above scheme, by setting the angle between the first straight surface and the first plane to be no less than 50° and no more than 130°, the anti-rotation interface formed by the cooperation of the first straight surface and the second straight surface can effectively resist the expansion force in the first direction inside the battery cell, and ensure the anti-rotation effect between the electrode terminal and the first insulating component to a certain extent, thereby enabling the battery cell to have high reliability, and thus enabling the battery device to have high reliability.

[0021] According to some embodiments of this application, the first flat surface is perpendicular to the first plane.

[0022] In the above scheme, by setting the first straight surface and the first plane perpendicular to each other, the anti-rotation interface formed by the cooperation of the first straight surface and the second straight surface can better resist the expansion force inside the battery cell along the first direction, effectively ensuring the anti-rotation effect between the electrode terminal and the first insulating component, thereby enabling the battery cell to have high reliability, and thus enabling the battery device to have high reliability.

[0023] According to some embodiments of this application, the outer peripheral surface of the electrode terminal includes two first flat surfaces arranged circumferentially along the electrode terminal. There are two electrode terminals with opposite polarities, and the angle formed by the two first flat surfaces of one electrode terminal is not the same as the angle formed by the two first flat surfaces of the other electrode terminal.

[0024] In the above scheme, on the one hand, by setting two first flat surfaces on the outer periphery of the electrode terminal, the electrode terminal and the first insulating component can have a better anti-rotation effect; on the other hand, when there are two electrode terminals, one of which is the positive electrode and the other is the negative electrode, by setting the angles of their respective first flat surfaces to be inconsistent, the error-proof effect can be effectively achieved, reducing the risk of incorrect assembly of positive and negative electrodes and improving the manufacturing efficiency of battery devices.

[0025] According to some embodiments of this application, the battery cell further includes a first connector, at least a portion of which is disposed on the outer periphery of the electrode terminal. The first connector is used to fix the electrode terminal to a first wall, and at least a portion of the first insulating member is located between the first connector and the electrode terminal.

[0026] In the above solution, by setting a first connector on the outer periphery of the electrode terminal, the electrode terminal is assembled with the first wall. Compared with the solution of riveting the electrode terminal to the first wall, on the one hand, it can simplify the assembly process of the electrode terminal, reduce the difficulty of electrode terminal conversion, and improve the manufacturing efficiency of the battery cell; on the other hand, it can reduce the space occupied by the electrode terminal in the internal space of the casing, so as to provide more space for the electrode assembly and electrolyte, thereby improving the volumetric energy density of the battery cell and thus improving the volumetric energy density of the battery device.

[0027] According to some embodiments of this application, along the thickness direction of the first wall, the first connector is located on the side of the first wall opposite to the electrode assembly.

[0028] In the above solution, by placing the first connector on the outside of the first wall, the space occupied by the first connector in the internal space of the battery cell can be reduced, so as to provide more space for the electrode assembly and electrolyte, thereby improving the volumetric energy density of the battery cell and thus improving the volumetric energy density of the battery device.

[0029] According to some embodiments of this application, the first connector includes a base and a limiting portion. The base is connected to a first wall, and the limiting portion is connected to the base and extends in a direction close to the electrode terminal. The limiting portion is configured to restrict the electrode terminal from moving away from the electrode assembly along the thickness direction of the first wall.

[0030] In the above scheme, the first connector includes a base and a limiting part. The base is connected to the first wall, and one end of the limiting part is connected to the base, while the other end extends in the direction close to the electrode terminal. This allows the limiting part to cooperate with the first wall to clamp and assemble the electrode terminal, restricting its displacement and thus achieving assembly. The scheme of using the limiting part and the first wall to clamp and assemble the electrode terminal effectively reduces the assembly difficulty of the electrode terminal, improves the manufacturing efficiency of the battery cell, and reduces the space occupied by the electrode terminal and the structural components used to assemble it within the battery cell. This results in a higher volumetric energy density for the battery cell and consequently, a higher volumetric energy density for the battery device.

[0031] According to some embodiments of this application, one of the limiting part and the first insulating member is provided with a first limiting groove, and the other is provided with a first limiting protrusion, the first limiting protrusion being accommodated in the first limiting groove.

[0032] In the above solution, one of the first insulating member and the limiting part is provided with a first limiting protrusion, and the other is provided with a first limiting groove, so that the first limiting protrusion and the first limiting groove can cooperate, which can reduce the risk of the first insulating member rotating relative to the first wall, thereby reducing the risk of the electrode terminal rotating, which is conducive to improving the circumferential locking effect of the electrode terminal. This effectively reduces the risk that the electrode terminal will rotate due to the impact of internal or external forces on the battery cell, which would damage the internal circuit structure of the battery cell and affect the reliability of the battery cell, thereby improving the reliability of the battery device.

[0033] According to some embodiments of this application, there are multiple first limiting grooves, which are arranged circumferentially along the electrode terminal. First limiting protrusions are correspondingly provided with the first limiting grooves, and each first limiting groove is used to accommodate one first limiting protrusion.

[0034] In the above scheme, by setting multiple first limiting grooves, the multiple first limiting grooves are arranged along the circumference of the electrode terminal, and each first limiting groove can accommodate a first limiting protrusion, which can improve the circumferential locking effect of the electrode terminal, effectively reduce the risk of the electrode terminal rotating due to impact and causing damage to the internal circuit structure of the battery cell, thereby improving the reliability of the battery cell and thus improving the reliability of the battery device.

[0035] According to some embodiments of this application, the limiting part is provided with a first limiting groove, and the first insulating member is provided with a first limiting protrusion.

[0036] In the above scheme, by setting a first limiting groove on the limiting part and a first limiting protrusion on the first insulating part, it is beneficial to control the quality of the limiting part, thereby improving the energy density of the battery cell; on the other hand, it is beneficial to improve the insulation performance of the first insulating part, thereby increasing the creepage distance between the first wall and the electrode terminal, which is beneficial to improving the reliability of the battery cell.

[0037] According to some embodiments of this application, the first limiting groove extends through both sides of the limiting portion along the thickness direction of the first wall.

[0038] In the above solution, by setting the first limiting groove to extend through both sides of the limiting part in the thickness direction of the first wall, the difficulty of setting the first limiting groove on the limiting part can be reduced, and the first limiting protrusion on the first insulating member can be easily assembled into the first limiting groove, thereby improving the manufacturing efficiency of the battery cell. On the other hand, the space of the first limiting groove for accommodating the first limiting protrusion can be further increased, which is conducive to improving the limiting effect between the first insulating member and the limiting part, and thus conducive to the circumferential locking effect of the electrode terminal.

[0039] According to some embodiments of this application, along the direction of the electrode assembly pointing to the first wall, a first limiting protrusion protrudes from the limiting portion, and the size of the first limiting protrusion protruding from the limiting portion is not greater than 2mm.

[0040] In the above scheme, by setting the size of the first limiting protrusion protruding from the limiting part to no more than 2mm along the direction of the electrode assembly pointing to the first wall, the occupation of the first limiting protrusion on the external space can be reduced, making the battery cell structure compact and conducive to improving the volumetric energy density.

[0041] According to some embodiments of this application, in the direction of the electrode assembly pointing towards the first wall, the limiting portion protrudes from the first limiting protrusion, or the side of the limiting portion away from the electrode assembly is flush with the side of the first limiting protrusion.

[0042] In the above scheme, along the direction of the electrode assembly pointing to the first wall, by setting the first limiting protrusion to not exceed the limiting part, the first limiting protrusion utilizes the space where the limiting part is located, making the battery cell structure compact and conducive to improving the volumetric energy density.

[0043] According to some embodiments of this application, a limiting portion is disposed around the electrode terminal so that the limiting portion surrounds and forms an outlet hole. Along the thickness direction of the first wall, the electrode terminal passes through the outlet hole and extends out of the limiting portion on the side away from the first wall.

[0044] In the above solution, by setting the electrode terminals to be inserted into the lead-out hole along the thickness direction of the first wall and extending out a limiting part away from the first wall, it is easier to assemble and connect the electrode terminals with the external structural components. This helps to reduce the difficulty of outputting or inputting electrical energy from the battery cell through the electrode terminals and improves the manufacturing efficiency of the battery device.

[0045] According to some embodiments of this application, along the radial direction of the electrode terminal, the minimum distance between the side of the first connector away from the electrode terminal and the edge of the first wall is greater than or equal to 2.5 mm.

[0046] In the above solution, by setting the minimum distance between the side of the first connector away from the electrode terminal and the edge of the first wall to be no less than 2.5mm, it is beneficial to reduce the risk that the first connector cannot be clamped and assembled with the first wall due to the expansion and deformation of the shell caused by internal pressure. This results in higher reliability of the battery cell and improves the reliability of the battery device.

[0047] According to some embodiments of this application, the electrode terminal includes a body and a flange, the flange protruding from the outer peripheral surface of the body, and at least a portion of the flange is located between the limiting portion and the first wall along the thickness direction of the first wall.

[0048] In the above scheme, the electrode terminal includes a body and a flange. The limiting part and the bottom wall are located on both sides of the flange to realize the clamping and assembly of the electrode terminal, so that the electrode terminal is effectively assembled on the first wall and has high structural stability.

[0049] According to some embodiments of this application, the battery cell further includes a first seal, at least a portion of which is located between the first wall and the flange along the thickness direction of the first wall.

[0050] In the above scheme, by setting the first sealing element, the risk of electrolyte leakage from between the first wall and the flange to the outside of the battery cell can be reduced, thus improving the reliability of the battery cell. On the other hand, it can also serve to insulate and isolate the flange and the first wall, reducing the risk of internal short circuits in the battery cell and thus improving the reliability of the battery cell.

[0051] According to some embodiments of this application, the first connector is separately disposed from the first wall.

[0052] In the above solution, by setting the first connector and the first wall as separate structures, it is beneficial to reduce the difficulty of setting the first connector on the first wall and to facilitate the assembly of the first insulating component between the first connector and the electrode terminal, thereby reducing the assembly difficulty of the battery cell and thus improving the manufacturing efficiency of the battery cell.

[0053] According to some embodiments of this application, the first connector is welded to the first wall.

[0054] In the above scheme, the first connector and the first wall are welded together, which can ensure high connection quality between the first connector and the first wall. The welding process is mature and efficient, which can effectively improve the manufacturing efficiency of the battery cell.

[0055] According to some embodiments of this application, the first connector is integrally formed with the first wall.

[0056] In the above solution, by making the first connector and the first wall integrally formed, the first connector can have high structural strength and the structure between the first connector and the first wall is stable. This facilitates the clamping and assembly of the electrode terminals by the first connector and the first wall together, reduces the risk of the electrode terminals falling off, and makes the battery cell highly reliable, thereby making the battery device highly reliable.

[0057] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0058] The electrode terminals of the battery cell provided by the above solution have a good circumferential locking effect, which can adapt to external and internal impacts. Especially when the capacity of the battery cell is greater than or equal to 500Ah, it can effectively reduce the risk of damage to the internal circuit structure of the battery cell caused by the rotation of the electrode terminals due to external or internal impacts, and ensure the reliability of the battery cell to a certain extent, especially the reliability of large-capacity battery cells.

[0059] According to some embodiments of this application, the outer casing is a square casing, with a dimension T1 in the first direction, a dimension W1 in the second direction, and a dimension H1 in the third direction, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction, the second direction and the third direction are mutually perpendicular.

[0060] According to some embodiments of this application, the outer casing is a steel casing.

[0061] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0062] Thirdly, some embodiments of this application also provide an electrical device, which includes a battery cell provided in the first aspect and / or a battery device provided in the second aspect, wherein the battery cell is used to provide electrical energy.

[0063] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0066] Figure 2 is an exploded perspective view of a battery device provided in some embodiments of this application;

[0067] Figure 3 is a perspective view of a single battery cell in some embodiments of this application;

[0068] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0069] Figure 5 is an exploded perspective view of a partial structure of a battery cell in some embodiments of this application;

[0070] Figure 6 is a schematic diagram of the structure of the electrode terminals and the first insulating member in some embodiments of this application;

[0071] Figure 7 is a schematic diagram of the internal structure of the first wall and the electrode terminals in some embodiments of this application;

[0072] Figure 8 is an enlarged view of point A in Figure 7;

[0073] Figure 9 is a top view of a partial structure of the first wall, the first insulating member, and the electrode terminals in some embodiments of this application;

[0074] Figure 10 is a schematic diagram showing the positional relationship between the flat area and the first plane of the electrode assembly in some embodiments of this application;

[0075] Figure 11 is a schematic diagram of the first wall, the first connector, and the first insulating member in some embodiments of this application;

[0076] Figure 12 is a schematic diagram of the internal structure of the first connector, the first insulating member, and the electrode terminal in some embodiments of this application;

[0077] Figure 13 is an enlarged view of point B in Figure 12;

[0078] Figure 14 is a schematic diagram of a single battery cell in some embodiments of this application.

[0079] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Battery Cell; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 11 - Outer Shell; 110 - Housing; 111 - First Wall; 1110 - Terminal Hole; 12 - Electrode Assembly; 120 - Adapter; 1200 - Protrusion; 121 - Tab; 12a - Flat Area; 122 - Positive Electrode; 123 - Negative Electrode; 124 - Separator; 13 - Electrode Terminal; 130 - Body; 131 - Flange; 13a - First Flat Surface; 13 b - First arc surface; 14 - First insulating component; 140 - First segment; 141 - Second segment; 142 - Third segment; 14a - Second flat surface; 14b - First limiting protrusion; 15 - First plane; 16 - First connecting component; 160 - Base; 161 - Limiting part; 161a - First limiting groove; 17 - First sealing component; 170 - First part; 171 - Second part; 18 - Pressure relief mechanism; 180 - Pressure relief hole; 19 - Liquid injection hole; 190 - Sealing component; 30 - Second insulating component; x - First direction; y - Second direction; z - Thickness direction of the first wall. Detailed Implementation

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

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

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

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

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

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

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

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

[0088] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

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

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

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

[0092] As an example, the positive electrode current collector can be a 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.).

[0093] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM6), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

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

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

[0096] 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 silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed 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.).

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

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

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

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

[0101] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0102] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0107] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0108] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0109] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0110] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0111] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0112] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0113] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0114] In some implementations, the electrode assembly has a stacked structure.

[0115] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0116] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0117] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0118] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0119] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0120] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0121] 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.

[0122] 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.

[0123] 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, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0124] 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.

[0125] 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.

[0126] 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.

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

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

[0129] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first enclosure body may be a top cover or a bottom plate.

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

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

[0132] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0133] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0134] For a typical battery cell, it includes a casing, electrode assembly, electrode terminals, and a first insulating component. The electrode terminals are insulated from and mounted to a first wall via the first insulating component. The electrode assembly is disposed inside the casing and electrically connected to the electrode terminals to achieve the input or output of electrical energy. In related technologies, there is a circuit structure between the electrode terminals and the electrode assembly to achieve the input and output of electrical energy. For example, the electrode terminals are directly connected to the tabs of the electrode assembly, or the electrode terminals are connected to the tabs of the electrode assembly via an adapter. However, during the manufacturing and use of battery cells, they are subject to impacts from external and internal forces. In some cases, the electrode assembly is prone to rotation due to impact, posing a risk of damage to the circuit structure between the electrode terminals and the electrode assembly. This can lead to a reduction in internal overcurrent within the battery cell, affecting charge and discharge performance, and even causing the internal circuit of the battery cell to break, resulting in the battery cell becoming unusable. Consequently, battery devices with such battery cells have low reliability.

[0135] Based on the above considerations, in order to solve the problem of electrode terminals easily rotating under impact, affecting the reliability of the battery device, this application provides a battery cell. The battery cell includes a housing, an electrode assembly, electrode terminals, and a first insulating member. The housing has a first wall. The electrode assembly is disposed within the housing. The electrode terminals are disposed on the first wall and electrically connected to the electrode assembly. At least a portion of the first insulating member is located between the electrode terminals and the first wall, and at least a portion of the first insulating member surrounds the electrode terminals. The outer peripheral surface of the electrode terminals includes a first flat surface, and the inner peripheral surface of the first insulating member includes a second flat surface. The first and second flat surfaces cooperate to restrict the rotation of the electrode terminals relative to the first insulating member.

[0136] In the above solution, by providing a first flat surface on the outer circumferential surface of the electrode terminal and a second flat surface that cooperates with the first flat surface on the inner circumferential surface of the first insulating member, the rotation of the electrode terminal relative to the first insulating member can be restricted, thereby achieving circumferential locking of the electrode terminal. This reduces the risk that the electrode terminal may rotate due to internal or external forces impacting the battery cell, which could damage the internal circuit structure of the battery cell and affect its reliability. In turn, this improves the reliability of the battery device.

[0137] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to mitigate the problem of short circuits in battery cells during use, thereby improving the reliability of the battery cells.

[0138] This application provides an electrical device that uses a single battery cell or battery pack as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0139] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0140] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle's operating power source or general power source. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0141] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0142] Please refer to Figure 2, which is an exploded perspective view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0143] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0144] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 20 is a cuboid.

[0145] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0146] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0147] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other through a busbar.

[0148] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 10 has a cuboid structure.

[0149] Some embodiments of this application provide a battery cell 10. Please refer to Figures 3-6. Figure 3 is a perspective view of the battery cell 10 in some embodiments of this application. Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 is an exploded perspective view of a partial structure of the battery cell 10 in some embodiments of this application. Figure 6 is a schematic diagram of the structure of the electrode terminal 13 and the first insulating member 14 in some embodiments of this application.

[0150] The battery cell 10 includes a housing 11, an electrode assembly 12, electrode terminals 13, and a first insulating member 14. The housing 11 has a first wall 111. The electrode assembly 12 is disposed within the housing 11. The electrode terminals 13 are disposed on the first wall 111 and electrically connected to the electrode assembly 12. At least a portion of the first insulating member 14 is located between the electrode terminals 13 and the first wall 111, and at least a portion of the first insulating member 14 surrounds the electrode terminals 13. The outer peripheral surface of the electrode terminals 13 includes a first flat surface 13a, and the inner peripheral surface of the first insulating member 14 includes a second flat surface 14a. The first flat surface 13a and the second flat surface 14a cooperate to restrict rotation of the electrode terminals 13 relative to the first insulating member 14.

[0151] In some embodiments, the outer casing 11 can also be used to contain an electrolyte, such as an electrolyte solution. The outer casing 11 can have various structural forms, such as a square casing 110 structure, a cylindrical casing 110 structure, or a bag-like structure. The outer casing 11 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0152] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a sealed structure, it can protect the electrode assembly and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can protect the electrode assembly 12. A sealing bag may also be included between the housing 11 and the electrode assembly 12 to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0153] In some embodiments, referring to Figures 3 and 4, the housing 11 may include a housing 110 and an end cap. The housing 110 has an internal cavity with an opening, meaning the housing 110 is a hollow structure with one end open. The end cap closes to the opening of the housing 110 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 12 and the electrolyte. In some embodiments, the connection between the end cap and the housing 110 is varied, including but not limited to bonding, welding, riveting, or threaded connections.

[0154] Optionally, the housing 11 may include a housing 110 and two end caps. The two opposite ends of the housing 110 are open, that is, they have two opposite openings. One opening can be closed by one end cap, and the other opening can be closed by the other end cap.

[0155] Optionally, the first wall 111 can be an end cap, or at least a portion of an end cap, or one of a plurality of walls of the housing 110. Exemplarily, in Figures 3 and 4, the first wall 111 is an end cap of the housing 11, and the thickness direction z of the first wall can be the height direction of the battery cell 10. Of course, in other embodiments, the first wall 111 can also be a bottom wall of the housing 110 disposed opposite to the end cap in the thickness direction z of the first wall, or a side wall adjacent to and abutting against the end cap.

[0156] When assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 110 first, and an electrolyte, such as electrolyte solution, can be filled into the housing 110. Then, the end cap can be placed on the opening of the housing 110 to close the opening of the housing 110.

[0157] The housing 110 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 110 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then the housing 110 can be a cylindrical structure; if the electrode assembly 12 is a cuboid structure, then the housing 110 can be a cuboid structure. Of course, the end cap can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 3 and 4, the housing 110 is a cuboid structure, and correspondingly, the end cap is a rectangular plate-like structure.

[0158] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The structure of the electrode assembly 12 can be various. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode, or a stacked structure formed by arranging a positive electrode, a separator, and a negative electrode in layers.

[0159] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0160] In this electrode assembly 12, a tab 121 is formed at one end of the first wall 111 along the thickness direction z. The tab 121 is used to input or output the positive or negative electrode of the electrode assembly 12, and is used to connect with the electrode terminal 13 to achieve an electrical connection between the electrode assembly 12 and the electrode terminal 13. It should be noted that the tab 121 of the electrode assembly 12 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 121 is used to output the positive electrode of the electrode assembly 12, then the tab 121 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 121 is used to output the negative electrode of the electrode assembly 12, then the tab 121 is a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0161] Optionally, the electrode assembly 12 housed within the housing 11 can be one or more. For example, in FIG4, the housing 11 of the battery cell 10 is provided with two electrode assemblies 12, which are stacked along their thickness direction. That is, the two electrode assemblies 12 are stacked along the thickness direction of the battery cell 10. Of course, in other embodiments, the electrode assembly 12 housed within the housing 11 can be one, three, four, five, six, seven, or eight, etc.

[0162] The electrode terminal 13 serves to output or input electrical energy of the battery cell 10. One end of the electrode terminal 13 is used to connect to the tab 121 of the electrode assembly 12, and the other end is used to connect to the busbar component to realize the input or output of electrical energy of the battery cell 10.

[0163] For example, the electrode terminal 13 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 13 can also be a composite material, that is, the electrode terminal 13 is formed by connecting two different metal materials, such as by hot pressing or cold pressing.

[0164] The first wall 111 is provided with a terminal hole 1110, which extends through both sides of the first wall along the thickness direction z. The electrode terminal 13 is inserted into the terminal hole 1110 along the thickness direction z of the first wall, so that part of the electrode terminal 13 is located in the terminal hole 1110. This allows the electrode terminal 13 to be connected to the electrode assembly 12 located inside the housing 11, as well as to the current collector located outside the housing 11, so as to realize the input or output of electrical energy of the battery cell 10.

[0165] The assembly relationship between the electrode terminal 13 and the first wall 111 is varied. For example, the electrode terminal 13 can be riveted to the first wall 111. For instance, the electrode terminal 13 may consist of two riveted parts that clamp the first wall 111. Alternatively, the electrode terminal 13 and the first wall 111 can be connected by other structural components. For example, the electrode terminal 13 may pass through a terminal hole 1110, and a first connector 16 may be welded to the first wall 111. The first connector 16 and the first wall 111 together clamp a portion of the electrode terminal 13 in the thickness direction z of the first wall, thereby assembling the electrode terminal 13.

[0166] Optionally, the electrode terminal 13 can be directly connected to the tab 121 of the electrode assembly 12, such as by welding or abutting, or it can be indirectly connected to the tab 121 of the electrode assembly 12 through other components. Similarly, the connection structure between the electrode terminal 13 and the bus component can also be various, such as welding, abutting, or snap-fitting.

[0167] In some embodiments, as shown in FIG4, the battery cell 10 may further include an adapter 120 disposed within the housing 11. The adapter 120 connects the electrode terminal 13 and the tab 121 of the electrode assembly 12 to realize the electrical connection between the electrode assembly 12 and the electrode terminal 13.

[0168] Optionally, referring to Figure 4, the adapter 120 has a protrusion 1200 on the side of the first wall facing the electrode terminal 13 along the thickness direction z. The protrusion 1200 is inserted into the terminal hole 1110 along the thickness direction z of the first wall, and is used to connect with the electrode terminal 13 to electrically connect the adapter 120 and the electrode terminal 13. This structure of the adapter 120 helps to reduce the difficulty of connecting the adapter 120 and the electrode terminal 13. Optionally, the protrusion 1200 can be welded to the electrode terminal 13 or abutted to it.

[0169] The first insulating member 14 is a structural component at least partially disposed between the electrode terminal 13 and the first wall 111. The first insulating member 14 can serve to insulate and isolate the first wall 111 and the electrode terminal 13, thereby achieving insulation isolation between the electrode terminal 13 and the first wall 111. The first insulating member 14 has good insulation properties, and the material of the first insulating member 14 can be various, such as rubber, silicone, or plastic.

[0170] In some embodiments, the first insulating member 14 may include an upper plastic layer. In some embodiments, a second insulating member 30 may also be provided on the inner side of the first wall 111, the second insulating member 30 being located between the first wall 111 and the electrode assembly 12.

[0171] Please refer to Figure 6. The outer peripheral surface of the electrode terminal 13 includes a first flat surface 13a. The outer peripheral surface of the electrode terminal 13 can be an outer surface arranged circumferentially around the electrode terminal 13. The circumferential direction of the electrode terminal 13 can be a direction surrounding the axial direction of the electrode terminal 13. The axial direction of the electrode terminal 13 can be a direction parallel to the thickness direction z of the first wall. The radial direction of the electrode terminal 13 can be perpendicular to the axial direction of the electrode terminal 13. The first flat surface 13a is a portion of the outer peripheral surface of the electrode terminal 13. Optionally, the outer peripheral surface of the electrode terminal 13 can be composed of multiple flat surfaces. For example, the electrode terminal 13 is a multi-faceted columnar structure, and its outer peripheral surface is formed by multiple first flat surfaces 13a connected end-to-end; or the outer peripheral surface of the electrode terminal 13 can be composed of flat surfaces plus arc surfaces. For example, the electrode terminal 13 is generally cylindrical, and its outer peripheral surface includes the first flat surface 13a and at least two arc surfaces connected to the first flat surface 13a.

[0172] Optionally, the first flat surface 13a can be formed in various ways. The first flat surface 13a can be formed on the electrode terminal 13 by turning, special processing or integral molding process.

[0173] For example, referring to FIG6, the electrode terminal 13 includes a body 130 and a flange 131. The flange 131 protrudes from the outer peripheral surface of the body 130. The body 130 is generally cylindrical. The outer peripheral surface of the body 130 includes a first flat surface 13a and an arc surface connected to the first flat surface 13a. Optionally, the first flat surface 13a may also be included in the flange 131.

[0174] At least a portion of the first insulating member 14 is disposed around the electrode terminal 13, that is, the first insulating member 14 has an inner peripheral surface facing the electrode terminal 13, and the inner peripheral surface is disposed circumferentially around the electrode terminal 13. The inner peripheral surface of the first insulating member 14 is provided with a second flat surface 14a, which corresponds to the first flat surface 13a. That is, when the electrode terminal 13 and the first insulating member 14 are assembled on the first wall 111, the first flat surface 13a and the second flat surface 14a can cooperate with each other, for example, contact, abut, or squeeze each other to restrict the electrode terminal 13 from rotating about its axial direction.

[0175] Optionally, referring to Figures 3-5, in Figures 3 and 4, the battery cell 10 includes two electrode terminals 13 and two adapters 120. The two electrode terminals 13 are spaced apart on the first wall 111. Correspondingly, each electrode assembly 12 has two tabs 121, which are spaced apart and have opposite polarities. The two electrode terminals 13 are electrically connected to the two tabs 121 of the electrode assembly 12 through the two adapters 120 to realize the input or output of the positive and negative electrodes of the battery cell 10. That is, the two electrode terminals 13 are used to output or input the positive and negative electrodes of the battery cell 10, respectively. Correspondingly, the two tabs 121 are the positive tab 121 and the negative tab 121 of the electrode assembly 12. In the battery cell 10 of these embodiments, each electrode terminal 13 corresponds to a first insulating member 14 between itself and the first wall 111. The following description uses one electrode terminal 13 and the corresponding first insulating member 14 as an example.

[0176] Optionally, both electrode terminals 13 are insulatedly mounted on the first wall 111, and each electrode terminal 13 is electrically connected to the corresponding tab 121 of the electrode assembly 12 to output the positive and negative terminals of the battery cell 10. Of course, in other embodiments, the two electrode terminals 13 may also be mounted on different walls of the housing 11.

[0177] In some embodiments, as shown in Figures 3-5, the battery cell 10 may further include a pressure relief mechanism 18, which is disposed on the housing 11. The pressure relief mechanism 18 is used to release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a predetermined value. The pressure relief mechanism 18 may be disposed on the end cap of the housing 11 or on the housing 110 of the housing 11.

[0178] Optionally, the pressure relief mechanism 18 and the housing 11 can be an integrally formed structure or separate structures. If the pressure relief mechanism 18 and the housing 11 are separate structures, the pressure relief mechanism 18 can be connected to the housing 11 by welding or other means. For example, the housing has a pressure relief hole 180, and the pressure relief mechanism 18 closes the pressure relief hole 180. Correspondingly, the pressure relief mechanism 18 can be a pressure relief component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief mechanism and the housing 11 are an integrally formed structure, the pressure relief mechanism is a region on the housing 11 with a weak structure, such as a region on the housing 11 with a groove.

[0179] In some embodiments, as shown in Figures 3-5, the housing 11 may also be provided with an injection hole 19 for injecting electrolyte, such as electrolyte solution, into the battery cell 10. Optionally, the injection hole 19 may be provided on an end cap, or the injection hole 19 may be provided on another wall portion of the housing 110. In some embodiments, after injection, the injection hole can be sealed by a sealing member 190, which may include a plastic pin, an aluminum pin, or other structural components.

[0180] In the above solution, by providing a first flat surface 13a on the outer peripheral surface of the electrode terminal 13 and a second flat surface 14a that cooperates with the first flat surface 13a on the inner peripheral surface of the first insulating member 14, the rotation of the electrode terminal 13 relative to the first insulating member 14 can be restricted, thereby achieving circumferential locking of the electrode terminal 13. This reduces the risk that the electrode terminal 13 may rotate due to internal or external forces impacting the battery cell 10, which could damage the internal circuit structure of the battery cell 10 and affect its reliability. In this way, the reliability of the battery device 100 can be improved.

[0181] According to some embodiments of this application, please refer to Figures 6-8. Figure 7 is a schematic diagram of the internal structure of the first wall 111 and the electrode terminal 13 in some embodiments of this application, and Figure 8 is an enlarged view of point A in Figure 7. The electrode terminal 13 includes a body 130 and a flange 131. The flange 131 protrudes from the outer peripheral surface of the body 130, and the outer peripheral surface of the body 130 includes a first flat surface 13a.

[0182] The body 130 is the main structure of the electrode terminal 13, which can be used to realize the electrical connection with the electrode assembly 12 and the electrical connection with the external bus component. The flange 131 is a structure that protrudes from the outer peripheral surface of the body 130. The flange 131 can be used for the assembly of the electrode terminal 13 and the first wall 111.

[0183] Optionally, referring to Figure 8, the electrode terminal 13 is assembled onto the first wall 111 via the first connector 16. The body 130 is inserted into the terminal hole 1110, and the flange 131 facing the electrode assembly 12 is disposed on the first wall 111. The first connector 16 is connected to the outer side of the first wall 111 and is located on the side of the flange 131 opposite to the electrode assembly 12. That is, the first connector 16 and the first wall 111 together clamp the flange 131, thereby limiting the displacement of the electrode terminal 13 along the thickness direction z of the first wall. Optionally, along the thickness direction z of the first wall, the end of the body 130 facing the electrode assembly 12 may not exceed the inner surface of the first wall 111. For example, the end of the body 130 facing the electrode assembly 12 may have a distance from the inner surface of the first wall 111, and may also accommodate other structural components of the battery cell 10, such as the adapter 120. Optionally, along the thickness direction z of the first wall, the end of the body 130 facing the electrode assembly 12 may exceed the inner surface of the first wall 111.

[0184] Please refer to Figure 8. A portion of the first insulating member 14 can cover the outer peripheral surface of the flange 131, and another portion of the first insulating member 14 can cover the outer peripheral surface of the body 130.

[0185] In the above scheme, the electrode terminal 13 includes a body 130 and a flange 131. The flange 131 can be used to restrict the movement of the electrode terminal 13 along its axial direction to achieve the assembly relationship between the electrode terminal 13 and the first wall 111. By providing a first flat surface 13a on the outer peripheral surface of the body 130, an anti-rotation fit relationship can be formed with the second flat surface 14a of the first insulating member 14, thereby improving the structural stability between the electrode terminal 13 and the first wall 111 to a certain extent, improving the impact resistance of the electrode terminal 13, reducing the risk of the electrode terminal 13 rotating due to impact, thereby making the battery cell 10 have higher reliability, and thus making the battery device 100 have higher reliability.

[0186] Alternatively, in other embodiments, the first flat surface 13a may be formed on the outer peripheral surface of the flange 131.

[0187] According to some embodiments of this application, the outer peripheral surface of the body 130 includes a plurality of first flat surfaces 13a, which are arranged circumferentially along the electrode terminal 13.

[0188] In some embodiments, the outer peripheral surface of the body 130 includes a plurality of first straight surfaces 13a, which are spaced apart or arranged sequentially along the circumference of the electrode terminal 13. Optionally, the body 130 is a multi-faceted prism, and the outer peripheral surface of the body 130 is formed by connecting the plurality of first straight surfaces 13a end to end. Optionally, the body 130 is generally cylindrical, and the outer peripheral surface of the body 130 includes a plurality of first straight surfaces 13a, which are spaced apart, and adjacent first straight surfaces 13a are connected by an arc surface.

[0189] Optionally, the inner peripheral surface of the first insulating member 14 may be provided with a second flat surface 14a, and any one of the plurality of first flat surfaces 13a on the outer peripheral surface of the body 130 can cooperate with a second flat surface 14a of the first insulating member 14.

[0190] Optionally, the inner circumferential surface of the first insulating member 14 may be provided with a plurality of second flat surfaces 14a, the second flat surfaces 14a corresponding one-to-one with the first flat surfaces 13a, such that each first flat surface 13a has a corresponding second flat surface 14a.

[0191] In the above solution, by providing multiple first flat surfaces 13a on the outer peripheral surface of the body 130, the electrode terminal 13 has multiple anti-rotation structures that cooperate with the second flat surfaces 14a of the first insulating member 14, thereby effectively reducing the risk of the electrode terminal 13 rotating relative to the first insulating member 14 due to impact, which would damage the internal circuit structure of the battery cell 10, thereby making the battery cell 10 have higher reliability, and thus making the battery device 100 have higher reliability.

[0192] According to some embodiments of this application, please refer to FIG6, a plurality of first flat surfaces 13a are arranged at intervals along the circumference of the electrode terminal 13, and two adjacent first flat surfaces 13a are connected by a first arc surface 13b.

[0193] In some embodiments, the outer peripheral surface of the body 130 further includes a first arc surface 13b, the center of which may be located on the axis of the body 130. The outer peripheral surface of the body 130 includes a plurality of first straight surfaces 13a spaced apart circumferentially along the electrode terminals 13, and adjacent first straight surfaces 13a are connected by the first arc surface 13b.

[0194] Optionally, the number of first flat surfaces 13a can be multiple, such as two, three, four, or more. The number of first curved surfaces 13b can also be multiple, such as two, three, four, or more.

[0195] For example, please refer to FIG6. The outer peripheral surface of the body 130 includes two first flat surfaces 13a and two first arc surfaces 13b. The adjacent ends of the two first flat surfaces 13a are connected by the first arc surfaces 13b.

[0196] In the above scheme, two adjacent first flat surfaces 13a are connected by a first arc surface 13b, so that the electrode terminal 13 has a larger cross-sectional area, which is conducive to improving the overcurrent capacity and the charging and discharging performance of the battery cell 10, thereby enabling the battery device 100 to have higher charging and discharging performance.

[0197] According to some embodiments of this application, please refer to FIG9, which is a top view of a partial structure of the first wall 111, the first insulating member 14, and the electrode terminal 13 in some embodiments of this application. Along the circumference of the electrode terminal 13, the length of the first straight surface 13a is not less than 2 mm and not more than 5 mm.

[0198] In some embodiments, the length direction of the first flat surface 13a may be perpendicular to the radial direction of the electrode terminal 13, and the length direction of the first flat surface 13a may be perpendicular to the thickness direction z of the first wall.

[0199] Please refer to Figure 9. In some embodiments shown in Figure 9, the length of the first flat surface 13a along the circumference of the electrode terminal 13 is C. The value of C can be 2 mm, 3 mm, 4 mm, 5 mm or any value between two adjacent values.

[0200] In the above scheme, by setting the length of the first flat surface 13a to be no less than 2mm, the anti-rotation fit between the electrode terminal 13 and the first insulating member 14 can be stabilized, effectively reducing the risk of the electrode terminal 13 rotating due to impact, thus giving the battery cell 10 high reliability. By setting the length of the first flat surface 13a to be no more than 5mm, the influence of the flat surface on the current-carrying area of ​​the electrode terminal 13 and the structural strength of the electrode terminal 13 can be reduced, thus giving the battery cell 10 high charge-discharge performance and reliability. Therefore, by limiting the length of the first flat surface 13a to be no less than 2mm and no more than 5mm, the charge-discharge performance and reliability of the battery cell 10 can be balanced.

[0201] According to some embodiments of this application, please refer to Figures 4, 9 and 10. Figure 10 is a schematic diagram of the positional relationship between the flat area 12a of the electrode assembly 12 and the first plane 15 in some embodiments of this application.

[0202] Electrode assembly 12 includes a positive electrode 122 and a negative electrode 123. Electrode assembly 12 has a flat region 12a. The portions of the positive electrode 122 and the negative electrode 123 located in the flat region 12a are stacked along a first direction x. The first flat surface 13a intersects with a first plane 15 perpendicular to the first direction x.

[0203] In some embodiments, the flat region 12a is the flat portion of the electrode assembly 12, and the portion of the positive electrode 122 located in the flat region 12a is generally flat, as is the portion of the negative electrode 123 located in the flat region 12a. As an example, both the portions of the positive electrode 122 and the negative electrode 123 located in the flat region 12a are planar structures. If the electrode assembly 12 is a wound structure, a portion of the electrode assembly 12 may be the flat region 12a, and another portion may be a corner region connecting the ends of the flat region 12a; if the electrode assembly 12 is a stacked structure, the entire electrode assembly 12 may be a flat region. The first direction x is the stacking direction of the portions of the positive electrode 122 and the negative electrode 123 located in the flat region 12a. A separator 124 is disposed between the positive electrode 122 and the negative electrode 123.

[0204] The first direction x is the stacking direction of the portion of the positive electrode 122 located in the flat region 12a and the portion of the negative electrode 123 located in the flat region 12a. During cycling, the electrode assembly 12 expands more along the first direction x. Referring to Figure 10, the first plane 15 is a plane perpendicular to the first direction x. Optionally, referring to Figure 4, the first direction x can be the thickness direction of the outer shell 11. The surface area of ​​the wall portion of the outer shell 11 along the first direction x is larger than the surface area of ​​other wall portions of the outer shell 11; that is, the wall portion of the outer shell 11 along the first direction x can be the larger surface of the outer shell 11. "The first plane 15 perpendicular to the first direction x" can be understood as the larger surface of the outer shell 11. Referring to Figure 4, the first direction x can be the width direction of the first wall 111, and the edge of the first wall 111 along the first direction x can be the longer side of the first wall 111.

[0205] The statement “the first straight surface 13a intersects with the first plane 15 perpendicular to the first direction x” can be understood as follows: the plane containing the first straight surface 13a is not parallel to the first plane 15 perpendicular to the first direction x, or the first straight surface 13a is not parallel to the large surface of the outer shell 11, or the first straight surface 13a is not parallel to the long side of the first wall 111.

[0206] In the above scheme, as the number of charge-discharge cycles increases, the internal pressure of the battery cell 10 increases, and the expansion force generated inside the battery cell 10 is relatively obvious in the first direction x. That is, the large surface of the battery cell 10 is significantly affected by the expansion force. In this regard, by setting the first flat surface 13a to intersect with the first plane 15 perpendicular to the first direction x, the risk of deformation of the first flat surface 13a or the second flat surface 14a due to the expansion force inside the battery cell 10 acting on the anti-rotation interface formed by the interaction of the first flat surface 13a and the second flat surface 14a, which would cause the anti-rotation interface to fail, can be effectively reduced. This makes the battery cell 10 have high reliability, and thus the battery device 100 has high reliability.

[0207] According to some embodiments of this application, the angle between the first flat surface 13a and the first plane 15 is not less than 50° and not greater than 130°.

[0208] In some embodiments, please refer to FIG9. Under top view, the long side of the first wall 111 can be regarded as the first plane 15. In FIG9, the angle a1 between the first straight surface 13a and the first plane 15 can be 50°, 55°, 60°, 65°, 70°...125°, 130° or any value between two adjacent values.

[0209] In the above scheme, by setting the angle between the first flat surface 13a and the first plane 15 to be no less than 50° and no more than 130°, the anti-rotation interface formed by the first flat surface 13a and the second flat surface 14a can effectively resist the expansion force along the first direction x inside the battery cell 10, and to a certain extent ensure the anti-rotation effect between the electrode terminal 13 and the first insulating member 14, thereby making the battery cell 10 have high reliability, and thus making the battery device 100 have high reliability.

[0210] In some embodiments, the angle between the first flat surface 13a and the first plane 15 is not 0° or 180°, but can be any value greater than 0° and less than 180°, such as 30°, 150°, etc.

[0211] According to some embodiments of this application, the first flat surface 13a is perpendicular to the first plane 15.

[0212] In some embodiments, the projection of the first flat surface 13a onto the thickness direction z of the first wall is linear, and the linear projection may be parallel to the first direction x.

[0213] In the above scheme, by setting the first flat surface 13a and the first plane 15 perpendicular to each other, the anti-rotation interface formed by the cooperation of the first flat surface 13a and the second flat surface 14a can better resist the expansion force along the first direction x inside the battery cell 10, effectively ensuring the anti-rotation effect between the electrode terminal 13 and the first insulating member 14, thereby making the battery cell 10 have high reliability, and thus making the battery device 100 have high reliability.

[0214] According to some embodiments of this application, the outer peripheral surface of the electrode terminal 13 includes two first flat surfaces 13a, which are arranged circumferentially along the electrode terminal 13. There are two electrode terminals 13, with opposite polarities. The angle formed by the two first flat surfaces 13a of one electrode terminal 13 is not the same as the angle formed by the two first flat surfaces 13a of the other electrode terminal 13.

[0215] In some embodiments, the battery cell 10 includes two electrode terminals 13, one of which is a positive electrode for electrical connection with a positive electrode tab, and the other is a negative electrode for electrical connection with a negative electrode tab. Optionally, the two electrode terminals 13 may be disposed on a first wall 111, and the two electrode terminals 13 may be arranged at intervals along a second direction y. Optionally, one of the two electrode terminals 13 may be disposed on the first wall 111, and the other may be disposed on another wall portion of the housing 11.

[0216] In some embodiments, the outer peripheral surface of each electrode terminal 13 includes two first flat surfaces 13a along the circumferential direction of the electrode terminal 13. The two first flat surfaces 13a can be directly connected or indirectly connected. The indirect connection scheme can include the two first flat surfaces 13a being connected through a first arc surface 13b.

[0217] The statement "The angle between the two first flat surfaces 13a of one electrode terminal 13 is inconsistent with the angle between the two first flat surfaces 13a of the other electrode terminal 13" can be understood as the value of the angle between the two first flat surfaces 13a of the electrode terminal 13 corresponding to the positive electrode being different from the value of the angle between the two first flat surfaces 13a of the electrode terminal 13 corresponding to the negative electrode.

[0218] For example, the two first flat surfaces 13a of the electrode terminal 13 corresponding to the positive electrode are parallel to each other, while the two first flat surfaces 13a of the electrode terminal 13 corresponding to the negative electrode are not parallel.

[0219] In the above scheme, on the one hand, by providing two first flat surfaces 13a on the outer peripheral surface of the electrode terminal 13, the electrode terminal 13 and the first insulating member 14 can have a better anti-rotation effect; on the other hand, when there are two electrode terminals 13, one of which is the positive electrode and the other is the negative electrode, by setting the angles of their respective first flat surfaces 13a to be inconsistent, the positive and negative electrode error prevention effect can be effectively achieved, reducing the risk of incorrect assembly of the positive and negative electrodes, and improving the manufacturing efficiency of the battery device 100.

[0220] According to some embodiments of this application, please refer to Figures 8 and 11. Figure 11 is a schematic diagram of the first wall 111, the first connector 16 and the first insulating member 14 in some embodiments of this application.

[0221] The battery cell 10 also includes a first connector 16, at least a portion of which is disposed on the outer periphery of the electrode terminal 13. The first connector 16 is used to fix the electrode terminal 13 to the first wall 111, and at least a portion of the first insulating member 14 is located between the first connector 16 and the electrode terminal 13.

[0222] In this embodiment, the first connector 16 serves to fix the electrode terminal 13 to the first wall 111. The first connector 16 is connected to the first wall 111, that is, the first connector 16 is fastened to the first wall 111. The first connector 16 and the first wall 111 can be an integrally formed structure or a separate structure. For example, in FIG8, the first connector 16 and the first wall 111 are an integrally formed structure. Optionally, the first connector 16 and the first wall 111 are integrally formed by die casting, stamping, forging, 3D printing or other processes. Optionally, the first connector 16 and the first wall 111 are an integral structure. During the assembly of the battery cell 10, by acting on the first connector 16, such as bending, a portion of the first connector 16 can be changed in shape, thereby abutting a portion of the electrode terminal 13 against the first wall 111, thereby achieving clamping and fixing of the electrode terminal 13.

[0223] In some other embodiments, the first connector 16 and the first wall 111 are separate structures, and the first connector 16 is connected to the first wall 111 by a connection process, such as welding, bonding, snapping, riveting or threading.

[0224] In some embodiments, the first connector 16 and the first wall 111 are made of the same material. For example, both the first wall 111 and the first connector 16 are made of metal. For instance, the first wall 111 is made of aluminum and the first connector 16 is made of aluminum; or the first wall 111 is made of steel and the first connector 16 is made of steel.

[0225] In some embodiments, the first connector 16 and the first wall 111 are made of different materials. For example, the first wall 111 is made of metal, while the first connector 16 is made of non-metal. For example, the first wall 111 is made of aluminum, and the first connector 16 is made of plastic; or the first wall 111 is made of steel, and the first connector 16 is made of plastic.

[0226] At least a portion of the first connector 16 is disposed on the outer periphery of the electrode terminal 13, that is, the first connector 16 is a structure disposed on the outer periphery of the electrode terminal 13. The first connector 16 can be an annular structure disposed around the electrode terminal 13, or an intermittent structure disposed around the electrode terminal 13, or an arc-shaped structure extending circumferentially along the electrode terminal 13.

[0227] In some embodiments, at least a portion of the first insulating member 14 is disposed between the first connector 16 and the electrode terminal 13. Optionally, the entire first insulating member 14 is located between the first connector 16 and the electrode terminal 13, and the first connector 16 fixes the electrode terminal 13 to the first wall 111 via the first insulating member 14. Optionally, a portion of the first insulating member 14 is located between the electrode terminal 13 and the first connector 16, another portion of the first insulating member 14 is located between the first wall 111 and the electrode terminal 13, or another portion of the first insulating member extends beyond the first connector 16 and is located on the outer periphery of the electrode terminal 13.

[0228] For example, please refer to FIG8. The first connector 16 and the first wall 111 are integral structures. A portion of the first insulating member 14 is located between the first wall 111 and the flange 131 of the electrode terminal 13. A portion of the first insulating member 14 is located between the flange 131 of the electrode terminal 13 of the first connector 16. A portion of the first insulating member 14 is located between the first connector 16 and the body 130 of the electrode terminal 13. The remaining portion of the first insulating member 14 extends beyond the first connection point and covers a portion of the body 130 of the electrode terminal 13.

[0229] In the above scheme, by setting the first connector 16 on the outer periphery of the electrode terminal 13, the assembly of the electrode terminal 13 and the first wall 111 is realized. Compared with the scheme of riveting the electrode terminal 13 to the first wall 111, on the one hand, it can simplify the assembly process of the electrode terminal 13, reduce the difficulty of the electrode terminal 13 conversion, and improve the manufacturing efficiency of the battery cell 10; on the other hand, it can reduce the space occupied by the electrode terminal 13 in the internal space of the outer casing 11, so as to provide more space for the electrode assembly 12 and the electrolyte, thereby improving the volumetric energy density of the battery cell 10, and further improving the volumetric energy density of the battery device 100.

[0230] According to some embodiments of this application, please refer to FIG8, along the thickness direction z of the first wall, the first connector 16 is located on the side of the first wall 111 opposite to the electrode assembly 12.

[0231] In some embodiments, the first connector 16 is located on the side of the first wall 111 opposite to the electrode assembly 12, that is, the first connector 16 is disposed on the outside of the first wall 111.

[0232] Optionally, in some embodiments, a groove is provided on the outer side of the first wall 111, the first connector 16 is connected to the outer side of the first wall 111 and is flush with the groove sidewall, the terminal hole 1110 is formed on the bottom wall of the groove, the flange 131 of the electrode terminal 13 is disposed on the bottom wall of the groove, and a portion of the first connector 16 is located on the side of the flange 131 away from the bottom wall of the groove.

[0233] In the above scheme, by setting the first connector 16 on the outside of the first wall 111, the occupation of the first connector 16 on the internal space of the battery cell 10 can be reduced, so as to provide more space for the electrode assembly 12 and the electrolyte, thereby improving the volumetric energy density of the battery cell 10 and thus improving the volumetric energy density of the battery device 100.

[0234] In other embodiments, the first connector 16 may also be disposed on the inner side of the first wall 111.

[0235] According to some embodiments of this application, please refer to FIG8. The first connector 16 includes a base 160 and a limiting portion 161. The base 160 is connected to the first wall 111. The limiting portion 161 is connected to the base 160 and extends in a direction close to the electrode terminal 13. The limiting portion 161 is configured to restrict the electrode terminal 13 from moving away from the electrode assembly 12 along the thickness direction z of the first wall.

[0236] The base 160 of the first connector 16 is the part of the first connector 16 used to connect with the first wall 111, and one end of the base 160 can be connected to the outer side of the first wall 111.

[0237] A limiting part 161 is provided at the other end of the base 160. The limiting part 161 is used to restrict the electrode terminal 13 from moving away from the electrode assembly 12 along the thickness direction z of the first wall. The structure in which the limiting portion 161 of the first connector 16 restricts the movement of the electrode terminal 13 along the thickness direction z of the first wall away from the electrode assembly 12 can be varied. For example, in FIG8, a portion of the electrode terminal 13 is located between the limiting portion 161 and the first wall 111 in the thickness direction z of the first wall, such that the limiting portion 161 and the first wall 111 are a structure that cooperates to clamp the electrode terminal 13, thereby restricting the movement of the electrode terminal 13 along the thickness direction z of the first wall away from the electrode assembly 12. In this case, a portion of the first insulating member 14 abuts between the limiting portion 161 and the electrode terminal 13 in the thickness direction z of the first wall. Of course, in other embodiments, the limiting portion 161 and the electrode terminal 13 can also be a structure in which the projections of the limiting portion 161 and the electrode terminal 13 in the thickness direction z of the first wall do not overlap, that is, the limiting portion 161 is a structure in which the electrode terminal 13 is indirectly pressed against the first wall 111 by the first insulating member 14.

[0238] The limiting part 161 is connected to the base 160 and extends in the direction close to the electrode terminal 13. It can be understood that the base 160 is disposed on the outer periphery of the electrode terminal 13, and the limiting part 161 is connected to the end of the base 160 and extends in the radial direction close to the electrode terminal 13 to achieve direct or indirect pressing of the electrode terminal 13.

[0239] Optionally, referring to Figures 8 and 11, the base 160 is an annular structure that provides the outer side of the first wall 111 and surrounds the outer periphery of the electrode terminal 13. The limiting part 161 can be the end of the base 160 that is opposite to the first wall 111. Along the circumference of the electrode terminal 13, the limiting part 161 is an annular structure and plate-shaped. Along the thickness direction z of the first wall, at least a portion of the projection of the limiting part 161 can fall on the flange 131.

[0240] In the above scheme, the first connector 16 includes a base 160 and a limiting part 161. The base 160 is connected to the first wall 111. One end of the limiting part 161 is connected to the base 160, and the other end extends in the direction close to the electrode terminal 13, so that the limiting part 161 can cooperate with the first wall 111 to clamp and assemble the electrode terminal 13, restricting the displacement of the electrode terminal 13, thereby realizing the assembly of the electrode terminal 13. The scheme of using the limiting part 161 and the first wall 111 to clamp and assemble the electrode terminal 13 can effectively reduce the assembly difficulty of the electrode terminal 13, which is beneficial to improving the manufacturing efficiency of the battery cell 10. At the same time, it can also reduce the space occupied by the electrode terminal 13 and the structural components used to assemble the electrode terminal 13 in the internal space of the battery cell 10, so that the battery cell 10 has a higher volumetric energy density, and thus the battery device 100 has a higher volumetric energy density.

[0241] According to some embodiments of this application, one of the limiting part 161 and the first insulating member 14 is provided with a first limiting groove 161a, and the other is provided with a first limiting protrusion 14b, the first limiting protrusion 14b being accommodated in the first limiting groove 161a.

[0242] The first limiting protrusion 14b and the first limiting groove 161a are configured to cooperate in restricting the rotation of the first connector 16 relative to the first insulator 14. That is, after the first limiting protrusion 14b is inserted into the first limiting groove 161a, it can achieve circumferential locking between the first connector 16 and the first insulator 14, thereby restricting the first connector 16 from rotating relative to the first insulator 14 about an axis extending along the thickness direction z of the first wall.

[0243] For example, referring to Figure 11, the first limiting protrusion 14b protrudes from the outer peripheral surface of the first insulating member 14, and correspondingly, the first limiting groove 161a is disposed on the inner peripheral surface of the limiting portion 161. Of course, in other embodiments, the first limiting groove 161a may also be disposed on the outer peripheral surface of the first insulating member 14, and correspondingly, the first limiting protrusion 14b may protrude from the inner peripheral surface of the limiting portion 161.

[0244] In the above solution, one of the first insulating member 14 and the limiting part 161 is provided with a first limiting protrusion 14b, and the other is provided with a first limiting groove 161a. The first limiting protrusion 14b and the first limiting groove 161a can cooperate, which can reduce the risk of the first insulating member 14 rotating relative to the first wall 111, thereby reducing the risk of the electrode terminal 13 rotating. This is beneficial to improving the circumferential locking effect of the electrode terminal 13, thereby effectively reducing the risk that the electrode terminal 13 will rotate due to the impact of internal or external forces on the battery cell 10, which would damage the internal circuit structure of the battery cell 10 and affect the reliability of the battery cell 10. In this way, the reliability of the battery device 100 can be improved.

[0245] In other embodiments, one of the base 160 and the first insulating member 14 is provided with a first limiting groove 161a, and the other is provided with a first limiting protrusion 14b, the first limiting protrusion 14b being accommodated within the first limiting groove 161a. Exemplarily, the base 160 has a first limiting groove 161a formed on its inner surface facing the electrode terminal 13, and the first insulating member 14 has a first limiting protrusion 14b protruding from its outer periphery facing the base 160.

[0246] According to some embodiments of this application, there are multiple first limiting grooves 161a, and the multiple first limiting grooves 161a are arranged along the circumference of the electrode terminal 13. The first limiting protrusions 14b are correspondingly provided with the first limiting grooves 161a, and each first limiting groove 161a is used to accommodate one first limiting protrusion 14b.

[0247] For example, a plurality of first limiting protrusions 14b are provided on the outer peripheral surface of the first insulating member 14. The plurality of first limiting protrusions 14b are arranged at intervals along the circumference of the electrode terminal 13. Correspondingly, a plurality of first limiting grooves 161a are provided on the limiting part 161. The plurality of first limiting grooves 161a are arranged at intervals along the circumference of the electrode terminal 13, so that each first limiting protrusion 14b can be inserted into a first limiting groove 161a.

[0248] For example, please refer to FIG11. The limiting part 161 is provided with two first limiting grooves 161a. Correspondingly, the outer peripheral surface of the first insulating member 14 is provided with two first limiting protrusions 14b. Of course, in other embodiments, the number of first limiting grooves 161a and first limiting protrusions 14b can also be three, four, five or seven, etc.

[0249] Optionally, in some embodiments, the limiting portion 161 is provided with a first limiting groove 161a and a first limiting protrusion 14b, and the first insulating member 14 is correspondingly provided with a first limiting protrusion 14b and a first limiting groove 161a. The first limiting groove 161a on the limiting portion 161 is used to accommodate the first limiting protrusion 14b on the first insulating member 14, and the first limiting protrusion 14b on the limiting portion 161 is used to insert into the first limiting groove 161a on the first insulating member 14.

[0250] In the above scheme, by setting multiple first limiting grooves 161a, the multiple first limiting grooves 161a are arranged along the circumference of the electrode terminal 13, and each first limiting groove 161a can accommodate a first limiting protrusion 14b, which can improve the circumferential locking effect of the electrode terminal 13, effectively reduce the risk of the electrode terminal 13 rotating due to impact and causing damage to the internal circuit structure of the battery cell 10, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery device 100.

[0251] According to some embodiments of this application, please refer to FIG11. The limiting part 161 is provided with a first limiting groove 161a, and the first insulating member 14 is provided with a first limiting protrusion 14b.

[0252] In some embodiments, a limiting portion 161 is disposed on the outer periphery of the first insulating member 14, and a first limiting groove 161a is formed on the inner peripheral side of the limiting portion 161 for insertion of a first limiting protrusion 14b on the outer periphery of the first insulating member 14, thereby achieving circumferential locking between the limiting portion 161 and the first insulating member 14. Optionally, the limiting portion 161 is annular and surrounds an outlet hole through which the body 130 of the power supply terminal 13 passes, and the first limiting groove 161a is formed on the wall of the outlet hole.

[0253] Optionally, referring to FIG11, the limiting part 161 has an annular structure, and two first limiting grooves 161a are formed on the side of the limiting part 161 facing the electrode terminal 13. The two first limiting grooves 161a are symmetrically arranged with respect to the central axis of the electrode terminal 13.

[0254] In the above scheme, by providing a first limiting groove 161a on the limiting part 161 and a first limiting protrusion 14b on the first insulating member 14, it is beneficial to control the mass of the limiting part 161, thereby improving the mass energy density of the battery cell 10; on the other hand, it is beneficial to improve the insulation performance of the first insulating member 14, thereby increasing the creepage distance between the first wall 111 and the electrode terminal 13, and improving the reliability of the battery cell 10.

[0255] According to some embodiments of this application, along the thickness direction z of the first wall, the first limiting groove 161a penetrates both sides of the limiting portion 161.

[0256] Please refer to Figures 11-13. Figure 12 is a schematic diagram of the internal structure of the first connector 16, the first insulating member 14, and the electrode terminal 13 in some embodiments of this application. Figure 13 is an enlarged view of point B in Figure 12.

[0257] In some embodiments, the opening of the first limiting groove 161a is disposed radially toward the first insulating member 14 to allow the first limiting protrusion 14b to be inserted. The first limiting groove 161a is through-hole along the thickness direction z of the first wall and extends through both sides of the limiting portion 161. Optionally, the first insulating member 14 can be assembled with the first connecting member 16 along the thickness direction z of the first wall, and the first limiting protrusion 14b can be inserted into the first limiting groove 161a along the thickness direction z of the first wall.

[0258] It should be noted that in other embodiments, the first limiting groove 161a may also be a structure provided on the inner peripheral surface of the limiting part 161 and not penetrating both sides of the limiting part 161 in the thickness direction z of the first wall. Of course, the first limiting groove 161a may also be a structure that only penetrates one side of the limiting part 161 in the thickness direction z of the first wall.

[0259] In the above solution, by setting the first limiting groove 161a to penetrate both sides of the limiting part 161 in the thickness direction z of the first wall, the difficulty of setting the first limiting groove 161a on the limiting part 161 can be reduced, and the first limiting protrusion 14b on the first insulating member 14 can be easily assembled into the first limiting groove 161a, thereby improving the manufacturing efficiency of the battery cell 10. On the other hand, the space of the first limiting groove 161a for accommodating the first limiting protrusion 14b can be further increased, which is conducive to improving the limiting effect between the first insulating member 14 and the limiting part 161, and thus conducive to the circumferential locking effect of the electrode terminal 13.

[0260] According to some embodiments of this application, please refer to FIG13, along the direction of the electrode assembly 12 pointing to the first wall 111, the first limiting protrusion 14b protrudes from the limiting portion 161, and the size of the first limiting protrusion 14b protruding from the limiting portion 161 is not greater than 2mm.

[0261] "The direction along the electrode assembly 12 pointing to the first wall 111" can be understood as the direction along the inside of the first wall 111 pointing to the outside of the first wall 111.

[0262] In some embodiments, referring to FIG13, the dimension of the first limiting protrusion 14b in the thickness direction z of the first wall is greater than the dimension of the first limiting groove 161a in the thickness direction z of the first wall, such that a portion of the first limiting protrusion 14b can protrude out of the first limiting groove 161a and be located outside the battery cell 10.

[0263] Referring to Figure 13, the first limiting protrusion 14b protrudes from the limiting part 161 with a size of D. The value of D can be a value no greater than 2mm, such as any value between 2mm, 1.5mm, 1mm, 0.5mm, 0.5mm and 0mm, or any value between two adjacent values.

[0264] In the above scheme, along the direction of the electrode assembly 12 pointing to the first wall 111, by setting the size of the first limiting protrusion 14b protruding from the limiting part 161 to no more than 2mm, the occupation of the first limiting protrusion 14b on the external space can be reduced, making the battery cell 10 compact and conducive to improving the volumetric energy density.

[0265] According to some other embodiments of this application, in the direction of the electrode assembly 12 pointing to the first wall 111, the limiting portion 161 protrudes from the first limiting protrusion 14b, or the side of the limiting portion 161 away from the electrode assembly 12 is flush with the side of the first limiting protrusion 14b.

[0266] "The direction along the electrode assembly 12 pointing to the first wall 111" can be understood as the direction along the inside of the first wall 111 pointing to the outside of the first wall 111.

[0267] In other embodiments, the dimension of the first limiting protrusion 14b in the thickness direction z of the first wall is less than or equal to the dimension of the first limiting groove 161a in the thickness direction z of the first wall, so that the first limiting protrusion 14b does not protrude from the first limiting groove 161a. For example, the first limiting portion 161 is entirely located in the first limiting groove 161a, or the side of the limiting portion 161 away from the electrode assembly 12 is flush with the side of the first limiting protrusion 14b.

[0268] In the above scheme, along the direction of the electrode assembly 12 pointing to the first wall 111, by setting the first limiting protrusion 14b to not exceed the limiting part 161, the first limiting protrusion 14b utilizes the space where the limiting part 161 is located, making the battery cell 10 structure compact and conducive to improving the volumetric energy density.

[0269] According to some embodiments of this application, please refer to Figures 11-13. The limiting portion 161 is disposed around the electrode terminal 13 so that the limiting portion 161 surrounds and forms an outlet hole. Along the thickness direction z of the first wall, the electrode terminal 13 passes through the outlet hole and extends out of the limiting portion 161 on the side away from the first wall 111.

[0270] The limiting part 161 can be an annular structure surrounding the electrode terminal 13, and the limiting part 161 encloses and forms an outlet hole, which is used to expose the electrode terminal 13 to the outside so that it can be connected to an external busbar component.

[0271] In some embodiments, a portion of the electrode terminal 13 may extend through and be located outside the lead-out hole to facilitate connection with an external busbar. Of course, in other embodiments, the electrode terminal 13 may be entirely contained within the lead-out hole.

[0272] Optionally, referring to Figures 6, 8 and 12, the electrode terminal 13 includes a body 130 and a flange 131. The flange 131 protrudes from the outer peripheral surface of the body 130. The end of the body 130 near the electrode assembly 12 in the thickness direction z of the first wall is used for electrical connection with the electrode assembly 12. The body 130 passes through the lead-out hole along the thickness direction z of the first wall and extends out a limiting portion 161 on the side away from the first wall 111, so that the end of the body 130 away from the electrode assembly 12 in the thickness direction z of the first wall can be assembled and connected with the busbar component.

[0273] In the above scheme, by setting the electrode terminal 13 to pass through the lead-out hole along the thickness direction z of the first wall and extending the limiting part 161 to the side away from the first wall 111, it is convenient for the electrode terminal 13 to be assembled and connected with the external structural components. This helps to reduce the difficulty of the electrode terminal 13 outputting or inputting electrical energy into the battery cell 10 and improves the manufacturing efficiency of the battery device 100.

[0274] According to some embodiments of this application, along the radial direction of the electrode terminal 13, the minimum distance between the side of the first connector 16 away from the electrode terminal 13 and the edge of the first wall 111 is greater than or equal to 2.5 mm.

[0275] The radial direction of electrode terminal 13 is perpendicular to the axial direction of electrode terminal 13, and the radial direction of electrode terminal 13 can also be perpendicular to the thickness direction z of the first wall. In some embodiments, the first wall 111 can be rectangular, having two short sides opposite each other along its length direction and two long sides opposite each other along its width direction, with the size of the long sides being larger than the size of the short sides. "The minimum distance between the side of the first connector 16 away from the electrode terminal 13 and the edge of the first wall 111 is greater than or equal to 2.5 mm" can be understood as the minimum distance between the first connector 16 and the long side being greater than or equal to 2.5 mm, and the minimum distance between the first connector 16 and the short side being greater than or equal to 2.5 mm.

[0276] For example, referring to Figure 9, along the radial direction of the electrode terminal 13, the minimum distance D between the side of the first connector 16 opposite to the electrode terminal 13 and the edge of the first wall 111 is denoted as D. The value of D can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, or a larger value, or any value between two adjacent values. It should be noted that the value of D can be determined based on the specifications of the battery cell 10. In some larger battery cells 10, the value of D can be even larger, such as 10 mm, 20 mm, 30 mm, 40 mm, or larger.

[0277] In the above scheme, by setting the minimum distance between the side of the first connector 16 away from the electrode terminal 13 and the edge of the first wall 111 to not less than 2.5mm, it is beneficial to reduce the risk that the first connector 16 will not be able to clamp and assemble the electrode terminal 13 together with the first wall 111 due to the expansion and deformation of the outer shell 11 caused by internal pressure. This makes the battery cell 10 have higher reliability and is conducive to improving the reliability of the battery device 100.

[0278] According to some embodiments of this application, please refer to Figures 6, 8 and 12. The electrode terminal 13 includes a body 130 and a flange 131. The flange 131 protrudes from the outer peripheral surface of the body 130. Along the thickness direction z of the first wall, at least a portion of the flange 131 is located between the limiting portion 161 and the first wall 111.

[0279] The body 130 is the main structure of the electrode terminal 13, which can be used to realize the electrical connection with the electrode assembly 12 and the electrical connection with the external bus component. The flange 131 is a structure that protrudes from the outer peripheral surface of the body 130. The flange 131 can be used for the assembly of the electrode terminal 13 and the first wall 111.

[0280] In some embodiments, along the thickness direction z of the first wall, the flange 131 may be located between opposite ends of the body 130. In other embodiments, along the thickness direction z of the first wall, the flange 131 may be located at one end of the body 130 facing the electrode assembly 12, with the side of the flange 131 facing the electrode assembly 12 flush with the side of the body 130 facing the electrode assembly 12.

[0281] In some embodiments, the limiting portion 161 acts directly or indirectly on the flange 131 to abut the flange 131 against the first wall 111, thereby limiting the displacement of the electrode terminal 13 along the first thickness direction.

[0282] In some embodiments, a portion of the flange 131 is located between the limiting portion 161 and the first wall 111 along the thickness direction z of the first wall. In other embodiments, the entire flange 131 is located between the limiting portion 161 and the first wall 111 along the thickness direction z of the first wall.

[0283] In the above scheme, the electrode terminal 13 includes a body 130 and a flange 131. The limiting part 161 and the bottom wall are located on both sides of the flange 131 to realize the clamping and assembly of the electrode terminal 13, thereby enabling the electrode terminal 13 to be effectively assembled on the first wall 111 and having high structural stability.

[0284] According to some embodiments of this application, the battery cell 10 further includes a first seal 17, at least a portion of which is located between the first wall 111 and the flange 131 along the thickness direction z of the first wall.

[0285] The first sealing element 17 can be a sealing structure, including but not limited to a sealing ring, sealing gasket, sealing block, etc. The material of the first sealing element 17 includes but is not limited to plastic or silicone.

[0286] In some embodiments, along the thickness direction z of the first wall, a portion of the first seal 17 is located between the first wall 111 and the flange 131, and another portion of the first seal 17 is located at other locations, such as between the first wall 111 and the body 130.

[0287] In other embodiments, the entire first seal 17 is located between the first wall 111 and the flange 131 along the thickness direction z of the first wall.

[0288] For example, referring to FIG8, the first seal 17 includes a first portion 170 and a second portion 171. The first portion 170 is annular and surrounds the outer periphery of the body 130. The first portion 170 is located between the side of the flange 131 facing the electrode assembly 12 and the first wall 111. The second portion 171 is vertically disposed on the inner periphery side of the first portion 170 and extends toward the electrode assembly 12. The second portion 171 is located between the hole wall of the terminal hole 1110 and the body 130.

[0289] In the above scheme, by setting the first sealing element 17, on the one hand, the risk of electrolyte leakage from between the first wall 111 and the flange 131 to the outside of the battery cell 10 can be reduced, thus making the battery cell 10 more reliable; on the other hand, it can also serve to insulate and isolate the flange 131 and the first wall 111, reducing the risk of internal short circuit in the battery cell 10, thus making the battery cell 10 more reliable.

[0290] According to some embodiments of this application, the first connector 16 and the first wall 111 are separately configured.

[0291] In some embodiments, the first connector 16 and the first wall 111 are separate structures, and the first wall 111 is connected to the first wall 111. For example, the first connector 16 and the first wall 111 are manufactured separately. When assembling the battery cell 10, the electrode terminal 13 can be first disposed on the first wall 111, and then the first connector 16 can be connected to the first wall 111 to fix the electrode terminal 13 on the first wall 111.

[0292] In a structure in which the first connector 16 and the first wall 111 are separate, the structure by which the first connector 16 is connected to the first wall 111 can be of various types, such as welding, bonding, snap-fitting, or bolting.

[0293] In the above scheme, by setting the first connector 16 and the first wall 111 as separate structures, it is beneficial to reduce the difficulty of setting the first connector 16 on the first wall 111, and it is also convenient to assemble the first insulating member 14 between the first connector 16 and the electrode terminal 13, thereby reducing the assembly difficulty of the battery cell 10 and thus improving the manufacturing efficiency of the battery cell 10.

[0294] According to some embodiments of this application, the first connector 16 is welded to the first wall 111.

[0295] In some embodiments, the first connector 16 is connected to the first wall 111 by welding. Alternatively, the first connector 16 can be connected to the first wall 111 by laser welding, ultrasonic welding, or other welding methods.

[0296] For example, the base 160 of the first connector 16 and the first wall 111 are welded together by laser welding.

[0297] In the above scheme, the first connector 16 and the first wall 111 are welded together, which can ensure high connection quality between the first connector 16 and the first wall 111. The welding process is mature and efficient, which can effectively improve the manufacturing efficiency of the battery cell 10.

[0298] According to some embodiments of this application, the first connector 16 is integrally formed with the first wall 111.

[0299] In some embodiments, the first connector 16 and the first wall 111 are integrally formed, that is, the first connector 16 and the first wall 111 are an integral structure. Optionally, the first wall 111 and the first connector 16 are structures formed by an integral forming process, such as stamping, casting, die casting, 3D printing or milling.

[0300] It should be noted that in the structure in which the first connector 16 and the first wall 111 are integrally formed, before the electrode terminal 13 is assembled, the first connector 16 can be a ring-shaped structure extending along the direction of the first wall 111. After the battery cell 10 is assembled, the first connector 16 is processed to form a base 160 and a limiting part 161. The limiting part 161 and the base 160 can be inclined to each other so that the limiting part 161 can clamp the electrode terminal 13 together with the first wall 111.

[0301] Alternatively, during assembly, the first connector 16 can be bent to form the limiting portion 161 and the base 160.

[0302] In the above solution, by making the first connector 16 and the first wall 111 integrally formed, the first connector 16 can have high structural strength and the structure between the first connector 16 and the first wall 111 is stable. This facilitates the clamping and assembly of the electrode terminal 13 by the first connector 16 and the first wall 111, reduces the risk of the electrode terminal 13 falling off, and makes the battery cell 10 highly reliable, thereby making the battery device 100 highly reliable.

[0303] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0304] In some embodiments, the capacity of a single battery cell 10 can refer to the total amount of charge stored in a single battery cell 10, and its unit can be Ah, ampere-hour.

[0305] In some embodiments, the capacity of the battery cell 10 provided above may be greater than or equal to 500Ah, such as 500Ah, 550Ah, 600Ah or larger.

[0306] The electrode terminals 13 of the battery cell 10 provided by the above solution have a good circumferential locking effect, so as to adapt to external and internal impacts. Especially when the capacity of the battery cell 10 is greater than or equal to 500Ah, it can effectively reduce the risk of damage to the internal circuit structure of the battery cell 10 caused by the rotation of the electrode terminals 13 due to external or internal impacts, and ensure the reliability of the battery cell 10 to a certain extent, especially the reliability of large-capacity battery cells 10.

[0307] According to some embodiments of this application, please refer to FIG14, which is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0308] The outer shell 11 is a square outer shell 11. The dimension of the outer shell 11 in the first direction x is T1, the dimension of the outer shell 11 in the second direction y is W1, and the dimension of the outer shell 11 in the third direction is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction x, the second direction y and the third direction are mutually perpendicular.

[0309] The first direction x can be the thickness direction of the battery cell 10, the second direction y can be the width direction of the battery cell 10, and the third direction can be the height direction of the battery cell 10. For example, the third direction can be parallel to the thickness direction z of the first wall.

[0310] The statement “The size of the outer casing 11 in the first direction x is T1, the size of the outer casing 11 in the second direction y is W1, and the size of the outer casing 11 in the third direction is H1” can be understood as the outer casing 11 of the battery cell 10 having a thickness of T1, a width of W1, and a height of H1.

[0311] In some embodiments, the thickness of the outer casing 11 is T1, the width is W1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0312] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0313] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0314] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0315] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 2000mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0316] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0317] In some embodiments, the outer casing 11 may be made of steel or stainless steel. In some embodiments, the outer casing 11 is a steel casing, and the thickness of the outer casing 11 may be thinner than that of an aluminum casing, in order to improve the volumetric energy density of the battery cell 10.

[0318] According to some embodiments of this application, some embodiments of this application also provide a battery device 100, which includes a battery cell 10 provided in the first aspect.

[0319] As shown in Figure 2, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0320] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0321] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0322] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2, the box 20 is a cuboid structure.

[0323] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in Figure 2, the housing 20 of the battery device 100 contains multiple battery cells 10, which can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 10 are connected in series and others in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 20.

[0324] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0325] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100 composed of multiple battery cells 10 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0326] Some embodiments of this application also provide an electrical device, which includes the battery cell 10 provided above and / or the battery device 100 provided above, wherein the battery cell 10 is used to provide electrical energy.

[0327] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 10 and / or battery devices 100. For example, the electrical device can be a vehicle 1000, which can be a range-extended vehicle 1000, a pure electric vehicle 1000, or a gasoline-powered vehicle 1000. The electrical energy provided by the battery cells 10 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0328] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 3-14.

[0329] The battery cell 10 can be a square battery cell 10. The battery cell 10 includes a housing 11, an electrode assembly 12, electrode terminals 13, and a first insulating member 14. The housing 11 may include a shell 110 and a first wall 111. The shell 110 has an opening, and the electrode assembly 12 can be inserted into the shell 110 through the opening. The first wall 111 is connected to the shell 110 and closes the opening, so that the electrode assembly 12 is in a closed space.

[0330] There are two electrode terminals 13, and the two electrode terminals 13 have opposite polarities. One is a positive terminal and is electrically connected to the positive terminal of the electrode assembly 12, and the other is a negative terminal and is electrically connected to the negative terminal of the electrode assembly 12.

[0331] The first wall 111 has two terminal holes 1110, and two electrode terminals 13 are respectively disposed in the corresponding terminal holes 1110. A first connector 16 is disposed on the outer side of the first wall 111, and the electrode terminals 13 are fixed to the first wall 111 by the first connector 16. The first connector 16 includes a base 160 and a limiting part 161. The base 160 is connected to the first wall 111, and the limiting part 161 is inclinedly disposed on the base 160 and extends toward the axis of the terminal hole 1110.

[0332] The electrode terminal 13 includes a body 130 and a flange 131 protruding from the outer peripheral surface of the body 130. The flange 131 overlaps the first wall 111. Along the thickness direction z of the first wall, the side of the flange 131 away from the first wall 111 is directly or indirectly abutted by the limiting part 161, so that the flange 131 is clamped by the limiting part 161 and the first wall 111, thereby fixing the electrode terminal 13.

[0333] The first insulating member 14 includes a first segment 140, a second segment 141, and a third segment 142, which are arranged along the thickness direction z of the first wall. The first segment 140 is located between the first wall 111 and the electrode terminal 13, the second segment 141 is located between the limiting portion 161 and the flange 131, and the third segment 142 is located between the limiting portion 161 and the body 130. The limiting portion 161 has a first limiting groove 161a formed on its inner circumferential side facing the electrode terminal 13, and the outer circumferential part of the third segment 142 has a first limiting protrusion 14b. The first limiting protrusion 14b is inserted into the first limiting groove 161a, achieving circumferential locking between the first insulating member 14 and the limiting portion 161. Referring to Figure 11, there are two first limiting grooves 161a and two first limiting protrusions 14b.

[0334] Referring to Figure 6, the outer peripheral surface of the electrode terminal 13 includes a first flat surface 13a, for example, the outer peripheral surface of the body 130 includes a first flat surface 13a. The inner peripheral surface of the first insulating member 14 includes a second flat surface 14a, for example, the inner peripheral surface of the third segment 142 includes a second flat surface 14a. The first flat surface 13a and the second flat surface 14a are in contact with each other, realizing circumferential locking between the first insulating member 14 and the electrode terminal 13. Referring to Figure 6, there are two of each of the first flat surface 13a and the second flat surface 14a.

[0335] In some embodiments, the first direction x can be the thickness direction of the outer shell 11, and the surface area of ​​the wall portion of the outer shell 11 along the first direction x is greater than the surface area of ​​the other wall portions of the outer shell 11, that is, the wall portion of the outer shell 11 along the first direction x can be the large surface of the outer shell 11. The plane containing the large surface can be parallel to the first plane 15, and the first straight plane 13a is perpendicular to the first plane 15.

[0336] In the above solution, on the one hand, by providing a first flat surface 13a on the outer peripheral surface of the electrode terminal 13 and a second flat surface 14a that cooperates with the first flat surface 13a on the inner peripheral surface of the first insulating member 14, the rotation of the electrode terminal 13 relative to the first insulating member 14 can be restricted, thereby achieving circumferential locking of the electrode terminal 13. This reduces the risk that the electrode terminal 13 may rotate due to internal or external impacts on the battery cell 10, leading to damage to the internal circuit structure of the battery cell 10 and affecting its reliability. This, in turn, improves the reliability of the battery device 100. On the other hand, by setting the first flat surface 13a perpendicular to the first plane 15, the anti-rotation interface formed by the cooperation of the first flat surface 13a and the second flat surface 14a can better resist the expansion force along the first direction x inside the battery cell 10, effectively ensuring the stability of the battery cell. The anti-rotation effect between the extreme terminal 13 and the first insulating member 14 enables the battery cell 10 to have high reliability, thereby enabling the battery device 100 to have high reliability. On the other hand, one of the first insulating member 14 and the limiting part 161 is provided with a first limiting protrusion 14b and the other is provided with a first limiting groove 161a, and the first limiting protrusion 14b and the first limiting groove 161a can cooperate to reduce the risk of the first insulating member 14 rotating relative to the first wall 111, thereby reducing the risk of the electrode terminal 13 rotating. This is beneficial to improving the circumferential locking effect of the electrode terminal 13, thereby effectively reducing the risk of the battery cell 10 rotating due to internal or external impacts, which could damage the internal circuit structure of the battery cell 10 and affect the reliability of the battery cell 10, thereby improving the reliability of the battery device 100.

[0337] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall; Electrode assembly, disposed within the housing; Electrode terminals are disposed on the first wall and electrically connected to the electrode assembly; A first insulating member is at least partially located between the electrode terminal and the first wall, and the first insulating member is at least partially disposed around the electrode terminal; The outer peripheral surface of the electrode terminal includes a first flat surface, and the inner peripheral surface of the first insulating member includes a second flat surface. The first flat surface and the second flat surface cooperate with each other to restrict the rotation of the electrode terminal relative to the first insulating member.

2. The battery cell according to claim 1, wherein, The electrode terminal includes a body and a flange, the flange protruding from the outer peripheral surface of the body, and the outer peripheral surface of the body includes the first flat surface.

3. The battery cell according to claim 2, wherein, The outer peripheral surface of the body includes a plurality of first flat surfaces, which are arranged circumferentially along the electrode terminals.

4. The battery cell according to claim 3, wherein, Along the circumference of the electrode terminal, a plurality of first flat surfaces are arranged at intervals, and adjacent first flat surfaces are connected by a first arc surface.

5. The battery cell according to any one of claims 1-4, wherein, Along the circumference of the electrode terminal, the length of the first straight surface is not less than 2 mm and not more than 5 mm.

6. The battery cell according to any one of claims 1-5, wherein, The electrode assembly includes a positive electrode and a negative electrode, the electrode assembly has a flat region, and the portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along a first direction; The first straight plane intersects with a first plane perpendicular to the first direction.

7. The battery cell according to claim 6, wherein, The angle between the first straight plane and the first plane is not less than 50° and not greater than 130°.

8. The battery cell according to claim 6 or 7, wherein, The first flat surface is perpendicular to the first plane.

9. The battery cell according to any one of claims 1-8, wherein, The outer peripheral surface of the electrode terminal includes two first flat surfaces, which are arranged circumferentially along the electrode terminal. The number of electrode terminals is two, and the polarities of the two electrode terminals are opposite. The angle formed by the two first flat surfaces of one of the electrode terminals is not the same as the angle formed by the two first flat surfaces of the other electrode terminal.

10. The battery cell according to any one of claims 1-9, wherein, The battery cell further includes a first connector, at least a portion of which is disposed on the outer periphery of the electrode terminal. The first connector is used to fix the electrode terminal to the first wall, and at least a portion of the first insulating member is located between the first connector and the electrode terminal.

11. The battery cell according to claim 10, wherein, Along the thickness direction of the first wall, the first connector is located on the side of the first wall opposite to the electrode assembly.

12. The battery cell according to claim 10 or 11, wherein, The first connector includes a base and a limiting portion. The base is connected to the first wall, and the limiting portion is connected to the base and extends in a direction close to the electrode terminal. The limiting portion is configured to restrict the electrode terminal from moving away from the electrode assembly along the thickness direction of the first wall.

13. The battery cell according to claim 12, wherein, One of the limiting part and the first insulating member is provided with a first limiting groove, and the other is provided with a first limiting protrusion, the first limiting protrusion being accommodated in the first limiting groove.

14. The battery cell according to claim 13, wherein, There are multiple first limiting grooves, which are arranged circumferentially along the electrode terminal. The first limiting protrusions are correspondingly provided with the first limiting grooves, and each first limiting groove is used to accommodate one first limiting protrusion.

15. The battery cell according to claim 13 or 14, wherein, The limiting part is provided with the first limiting groove, and the first insulating member is provided with the first limiting protrusion.

16. The battery cell according to claim 15, wherein, Along the thickness direction of the first wall, the first limiting groove passes through both sides of the limiting part.

17. The battery cell according to claim 16, wherein, Along the direction of the electrode assembly pointing towards the first wall, the first limiting protrusion protrudes from the limiting portion, and the size of the first limiting protrusion protruding from the limiting portion is no greater than 2mm.

18. The battery cell according to claim 16 or 17, wherein, Along the direction from the electrode assembly to the first wall, the limiting portion protrudes from the first limiting protrusion, or the side of the limiting portion away from the electrode assembly is flush with the side of the first limiting protrusion.

19. The battery cell according to any one of claims 12-18, wherein, The limiting portion is arranged around the electrode terminal so that the limiting portion surrounds and forms an outlet hole. Along the thickness direction of the first wall, the electrode terminal passes through the outlet hole and extends out of the limiting portion on the side away from the first wall.

20. The battery cell according to any one of claims 12-19, wherein, Along the radial direction of the electrode terminal, the minimum distance between the side of the first connector away from the electrode terminal and the edge of the first wall is greater than or equal to 2.5 mm.

21. The battery cell according to any one of claims 12-20, wherein, The electrode terminal includes a body and a flange. The flange protrudes from the outer peripheral surface of the body and, along the thickness direction of the first wall, at least a portion of the flange is located between the limiting portion and the first wall.

22. The battery cell according to claim 21, wherein, The battery cell further includes a first seal, at least a portion of which is located between the first wall and the flange along the thickness direction of the first wall.

23. The battery cell according to any one of claims 10-22, wherein, The first connector is separately disposed from the first wall.

24. The battery cell according to claim 23, wherein, The first connector is welded to the first wall.

25. The battery cell according to any one of claims 10-24, wherein, The first connector is integrally formed with the first wall.

26. The battery cell according to any one of claims 1-25, wherein, The capacity of the battery cell is greater than or equal to 500Ah.

27. The battery cell according to claim 26, wherein, The outer casing is a square casing. The dimension of the outer casing in the first direction is T1, the dimension in the second direction is W1, and the dimension in the third direction is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction, and the third direction are mutually perpendicular.

28. The battery cell according to any one of claims 1-27, wherein, The outer shell is made of steel.

29. A battery device, wherein, Includes the battery cell as described in any one of claims 1-28.

30. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-28, and / or the battery device according to claim 29, wherein the battery cell is used to provide electrical energy.

Images