Battery cell, battery device, and electric device

Abstract

A battery cell, a battery device, and an electric device. The battery cell comprises a casing, an electrode assembly, an electrode terminal, and an adapter. The casing has a first wall; the electrode assembly is arranged in the casing; the electrode terminal is insulatedly arranged on the first wall; the adapter is arranged between the electrode assembly and the electrode terminal; and the electrode terminal is electrically connected to a tab of the electrode assembly by means of the adapter. The adapter is provided with a first connecting portion, a second connecting portion, and a thickened portion; the first connecting portion is connected to the electrode terminal; the second connecting portion is connected to the tab; the first connecting portion and the second connecting portion are connected by means of the thickened portion; and the thickness of the thickened portion is greater than that of the first connecting portion. The described solution can effectively improve the charging / discharging performance of the battery device.

Description

Battery cell, battery device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application 202411547178.8, filed on October 31, 2024, entitled “Battery cell, battery device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular, relates to a battery cell, a battery device and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the development of battery technology, how to improve the charge and discharge performance of the battery device is a technical problem that needs to be solved in the battery technology. SUMMARY

[0005] The present application provides a battery cell, a battery device and an electric device. The technical scheme provided by the present application can effectively improve the charge and discharge performance of the battery device.

[0006] The present application is achieved by the following technical scheme:

[0007] In a first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and an adapter. The shell has a first wall. The electrode assembly is arranged in the shell. The electrode terminal is insulated and arranged on the first wall. The adapter is arranged between the electrode assembly and the electrode terminal, and the electrode terminal is electrically connected to the tab of the electrode assembly through the adapter. The adapter has a first connecting portion, a second connecting portion and a thickened portion. The first connecting portion is connected to the electrode terminal, the second connecting portion is connected to the tab, and the first connecting portion and the second connecting portion are connected through the thickened portion. The thickness of the thickened portion is greater than the thickness of the first connecting portion.

[0008] In the above scheme, the thickened portion with a larger thickness is arranged to connect the first connecting portion and the second connecting portion, i.e. the thickened portion with a larger thickness is arranged on the flow path between the pole and the tab. This can increase the local flow area of the adapter, thereby reducing the internal resistance of the battery cell, effectively improving the problem of flow temperature rise, making the battery cell have higher reliability and charge and discharge performance, and further making the battery device have higher reliability and charge and discharge performance.

[0009] According to some embodiments of this application, at least a portion of the thickened portion is arranged around the outer periphery of the first connecting portion.

[0010] In the above solution, by encircling at least a portion of the thickened part around the outer periphery of the first connecting part, the structural strength of the adapter can be effectively improved, making the internal structure of the battery cell stable and reliable, which is conducive to improving the reliability of the battery cell. On the other hand, the overcurrent area between the first connecting part and the second connecting part can be effectively increased, which can effectively improve the overcurrent bottleneck between the electrode assembly, the adapter and the tab, thereby improving the reliability of the battery cell and the charge and discharge performance, and further improving the reliability and charge and discharge performance of the battery device.

[0011] According to some embodiments of this application, along the thickness direction of the first wall, the first connecting portion has a first surface facing the electrode assembly, and the thickened portion protrudes from the first surface.

[0012] In the above solution, by setting the thickened part to protrude from the first surface, on the one hand, the difficulty of connecting the electrode terminal and the first connecting part can be reduced, and the assembly efficiency of the battery cell can be improved; on the other hand, a cavity can be formed between the thickened part and the first surface to accommodate more electrochemical substances, thereby improving the volumetric energy density of the battery cell and the volumetric energy density of the battery device.

[0013] According to some embodiments of this application, along the thickness direction of the first wall, the first connecting portion has a second surface facing away from the electrode assembly, and the thickened portion has a third surface facing away from the electrode assembly, with the second and third surfaces being coplanar.

[0014] In the above solution, by setting the second surface of the first connecting part facing the electrode terminal and the third surface of the thickened part facing the electrode terminal as coplanar, on the one hand, the thickened part can have a larger flow area, which can improve the flow bottleneck problem between the electrode terminal, the adapter and the tab. On the other hand, the side of the adapter facing the electrode terminal is relatively flat, which reduces the difficulty of connecting the electrode terminal and the adapter, thereby improving the manufacturing efficiency of the battery cell.

[0015] According to some embodiments of this application, the thickness of the first connecting portion is not less than 0.6 mm and not more than 1.5 mm.

[0016] In the above solution, on the one hand, by setting the thickness of the first connecting part to not less than 0.6mm, the risk of excessive overcurrent temperature rise due to the first connecting part being too thin can be reduced, thus enabling the battery cell to have high charge and discharge performance. On the other hand, by setting the thickness of the first connecting part to not more than 1.5mm, the problem of excessive difficulty in connecting the first connector and the electrode terminal due to the first connecting part being too thick can be reduced, thus affecting the manufacturing efficiency of the battery cell. Therefore, by setting the thickness of the first connecting part to not less than 0.6mm and not more than 1.5mm, the charge and discharge performance and manufacturing efficiency of the battery cell can be balanced.

[0017] According to some embodiments of this application, the thickness of the thickened portion is not less than 0.8 mm and not more than 2.5 mm.

[0018] In the above solution, on the one hand, by setting the thickness of the thickened portion to not less than 0.8 mm, the problem of overcurrent bottleneck between the electrode terminals, adapters and tabs is improved, enabling the battery cell to have high charge and discharge performance; on the other hand, by setting the thickness of the thickened portion to not more than 2.5 mm, the risk of the thickened portion occupying the internal space of the battery cell due to excessive thickness can be reduced, enabling the battery cell to have high volumetric energy density. Therefore, by setting the thickness of the thickened portion to not less than 0.8 mm and not more than 2.5 mm, the charge and discharge performance and volumetric energy density of the battery cell can be balanced.

[0019] According to some embodiments of this application, at least a portion of the second connecting portion is arranged around the outer periphery of the thickened portion.

[0020] In the above solution, by circling at least part of the second connecting portion around the outer periphery of the thickened portion, the structural strength of the adapter can be improved, making the internal structure of the battery cell stable and reliable. On the other hand, the current can flow effectively and stably through the thickened portion between the first connecting portion and the second connecting portion, so that the battery cell has high charge and discharge performance.

[0021] According to some embodiments of this application, the thickness of the thickened portion is greater than the thickness of the second connecting portion.

[0022] In the above solution, by setting the thickness of the thickened part to be greater than the thickness of the second connecting part, on the one hand, the thickness of the second connecting part is thinner, which can reduce the difficulty of connecting with the tab, thereby improving the manufacturing efficiency of the battery cell; on the other hand, it can increase the local overcurrent area of ​​the adapter, effectively improve the overcurrent bottleneck problem between the electrode terminal, the adapter and the tab, so that the battery cell has high charge and discharge performance.

[0023] According to some embodiments of this application, the thickness of the second connecting portion is not less than 0.8 mm and not more than 2.0 mm.

[0024] In the above solution, on the one hand, by setting the thickness of the second connection part to not less than 0.8mm, the risk of excessive overcurrent temperature rise due to the second connection part being too thin can be reduced, thus enabling the battery cell to have high charge and discharge performance. On the other hand, by setting the thickness of the second connection part to not more than 2.0mm, the problem of excessive difficulty in connecting the first connector and the tab due to the second connection part being too thick can be reduced, thus affecting the manufacturing efficiency of the battery cell. Therefore, by setting the thickness of the first connection part to not less than 0.8mm and not more than 2.0mm, the charge and discharge performance and manufacturing efficiency of the battery cell can be balanced.

[0025] According to some embodiments of this application, along the thickness direction of the first wall, the second connecting portion has a fourth surface facing away from the electrode assembly, and the thickened portion protrudes from the fourth surface.

[0026] In the above solution, on the one hand, by setting the side of the second connecting part away from the electrode assembly to be recessed relative to the thickened part, the internal space occupied by the second connecting part of the battery cell can be reduced, so that the battery cell has a higher volumetric energy density; on the other hand, the side of the second connecting part facing the electrode assembly can be flush with the side of the thickened part facing the electrode assembly, thereby reducing the difficulty of connecting with the tab, so that the tab can be effectively electrically connected to the adapter, thereby improving the manufacturing efficiency and reliability of the battery cell.

[0027] According to some embodiments of this application, the battery cell further includes a first insulating member, which is located between the first wall and the adapter along the thickness direction of the first wall. A first groove is formed on the side of the first insulating member facing the adapter along the thickness direction of the first wall, and a portion of the thickened portion protruding from the fourth surface is accommodated in the first groove.

[0028] In the above solution, by providing a first groove on the side of the first insulating member facing the adapter to accommodate the portion of the thickened part protruding from the fourth surface, the thickened part of the adapter can utilize the space where the first insulating member is located, thereby reducing the occupation of electrochemical substances inside the battery cell, thus effectively improving the volumetric energy density of the battery cell, and further effectively improving the volumetric energy density of the battery device.

[0029] According to some embodiments of this application, a first through hole is provided on the bottom wall of the first groove, through which the power supply terminal passes.

[0030] In the above solution, by providing a first through hole on the bottom wall of the first groove, a position can be provided for the connection between the electrode terminal and the first connecting part, thereby reducing the difficulty of connecting the electrode terminal and the adapter and improving the manufacturing efficiency of the battery cell.

[0031] According to some embodiments of this application, a first protrusion is formed on the side of the first insulating member facing away from the adapter along the thickness direction of the first wall. On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the first protrusion at least partially overlaps with the projection of the thickened portion. A second groove is formed on the side of the first wall facing the first insulating member along the thickness direction of the first wall, and at least a portion of the first protrusion is accommodated in the second groove.

[0032] In the above solution, on the one hand, by setting the first protrusion at the position corresponding to the first groove, the thickness of the first insulating component can meet the insulation requirements, reduce the risk of internal short circuit in the battery cell, and enable the battery cell to have high reliability; on the other hand, by setting the second groove on the inner side of the first wall, the first protrusion can make use of the space where the first wall is located, thereby reducing the occupation of electrochemical substances inside the battery cell, thereby effectively improving the volumetric energy density of the battery cell, and thus effectively improving the volumetric energy density of the battery device.

[0033] According to some embodiments of this application, a second through hole is formed on the bottom wall of the second groove, through which the power supply terminal passes.

[0034] In the above solution, by providing a second through hole on the bottom wall of the second groove, a position can be provided for the connection between the electrode terminal and the first connecting part, thereby reducing the difficulty of connecting the electrode terminal and the adapter and improving the manufacturing efficiency of the battery cell.

[0035] According to some embodiments of this application, the distance between the thickened portion and the groove sidewall of the second groove along the radial direction of the electrode terminal is not less than 0.5 mm and not more than 2 mm.

[0036] In the above solution, by setting the distance between the thickened part and the sidewall of the second groove to be no less than 0.5mm and no more than 2mm, on the one hand, it can meet the assembly of the first insulating part, so that the first insulating part can effectively isolate the adapter and the first wall, reduce the risk of internal short circuit in the battery cell, and make the battery cell highly reliable; on the other hand, it can avoid to some extent the problem of the battery cell's internal space being wasted due to the excessive distance between the thickened part and the sidewall of the second groove, thus affecting the volumetric energy density of the battery cell.

[0037] According to some embodiments of this application, along the thickness direction of the first wall, the thickened portion has a fifth surface facing the electrode assembly, and the second connecting portion has a sixth surface facing the electrode assembly, the fifth surface and the sixth surface being coplanar.

[0038] In the above solution, by setting the fifth surface of the thickened part to be flush with the sixth surface of the second connecting part, the side of the adapter facing the electrode assembly can be made relatively flat, reducing the risk of damage to the electrode assembly structure caused by interference of the adapter to the end face of the electrode assembly, making the internal structure of the battery cell stable and reliable, and improving the reliability of the battery cell.

[0039] According to some embodiments of this application, along the thickness direction of the first wall, the first connecting portion has a first surface facing the electrode assembly, and the electrode terminal has a seventh surface facing the adapter, the area of ​​the first surface being larger than the area of ​​the seventh surface.

[0040] In the above scheme, by setting the area of ​​the first surface to be larger than the area of ​​the seventh surface of the electrode terminal, the first connecting part can provide a larger connection position for the electrode terminal, thereby enabling a stable connection between the electrode terminal and the first connecting part, which is beneficial to the conduction of electrical energy between the electrode terminal and the adapter.

[0041] 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. On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the thickened portion at least partially overlaps with the projection of the first connector.

[0042] In the above solution, by setting a first connector on the outer periphery of the electrode terminal to assemble the electrode terminal 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; furthermore, by setting the thickened part corresponding to the first connector, the supporting force of the adapter on the electrode terminal can be effectively improved, so as to stably clamp the electrode terminal together with the first connector, making the battery cell structure stable and highly reliable.

[0043] 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.

[0044] 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.

[0045] According to some embodiments of this application, the electrode terminal includes a body and a flange. The body is connected to a first connecting portion, and the flange protrudes from the outer peripheral surface of the body. 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.

[0046] 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.

[0047] According to some embodiments of this application, the battery cell further includes a first seal, at least a portion of which is disposed between the first wall and the flange along the thickness direction of the first wall, and the projection of the first seal at least partially overlaps with the projection of the thickened portion on the same projection plane perpendicular to the thickness direction of the first wall.

[0048] In the above solution, by setting a first seal, 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 improving the reliability of the battery cell. Furthermore, by setting the projection of the first seal to at least partially overlap with the projection of the thickened part, the thicker part of the adapter can effectively support the first seal, thereby giving the first seal better sealing performance, reducing the risk of electrolyte leakage, and improving the reliability of the battery cell.

[0049] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the projection of the thickened portion overlaps with the projection of the tab.

[0050] In the above solution, by setting the projection of the tab and the thickened part to partially overlap, a larger electrical connection area can be achieved between the tab and the adapter, which is beneficial to improving the charging and discharging performance of the battery cell and the charging and discharging performance of the battery device.

[0051] According to some embodiments of this application, the structural strength of the adapter is greater than the structural strength of the first wall.

[0052] In the above scheme, by setting the structural strength of the adapter to be greater than that of the first wall, the adapter can provide greater support for the electrode terminals or other structural components on the first wall, thereby mitigating the impact of the first wall on the volumetric energy density of the battery cell in order to meet strength requirements.

[0053] According to some embodiments of this application, the electrode assembly includes a main body portion, and an electrode tab is disposed at one end of the main body portion facing the first wall along the thickness direction of the first wall; or, the electrode tab is disposed on the side of the main body portion along a first direction, the first direction being perpendicular to the thickness direction of the first wall.

[0054] In some embodiments of the above scheme, by placing the tab at the end of the main body facing the first wall, the difficulty of connecting the tab and the adapter can be reduced, which is conducive to improving the manufacturing efficiency of the battery cell. In some embodiments, by placing the tab on the side of the main body, the width of the tab can be designed to be larger, thereby increasing the current flow area of ​​the tab and thus improving the charging and discharging performance of the battery cell and the battery device.

[0055] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0056] The battery cells provided by the above solution have high charge and discharge performance and reliability. In particular, when the capacity of the battery cell is greater than or equal to 500Ah, it can effectively improve the charging rate of the battery, thereby meeting the charging and discharging requirements of large-capacity batteries.

[0057] According to some embodiments of this application, the outer casing is a square casing, with a dimension W1 in the first direction, a dimension T1 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.

[0058] According to some embodiments of this application, the outer casing is a steel casing.

[0059] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0060] 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.

[0061] 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

[0062] 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.

[0063] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application;

[0064] Figure 2 is an exploded perspective view of the battery device in some embodiments of this application;

[0065] Figure 3 is a perspective view of a single battery cell in some embodiments of this application;

[0066] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0067] Figure 5 is a schematic diagram of the first wall and electrode terminals in some embodiments of this application;

[0068] Figure 6 is a schematic diagram of the internal structure of a single battery cell in some embodiments of this application;

[0069] Figure 7 is a schematic diagram of the structure of the adapter in some embodiments of this application;

[0070] Figure 8 is a partial schematic diagram of the internal structure of a single battery cell in some embodiments of this application;

[0071] Figure 9 is a partial schematic diagram of the electrode terminals, the first wall, the first insulating member, and the adapter in some embodiments of this application;

[0072] Figure 10 is a schematic diagram of a single battery cell in some embodiments of this application.

[0073] 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; 1111 - Injection Hole; 1112 - Pressure Relief Mechanism; 1113 - Second Recess; 12 - Electrode Assembly; 120 - Tab; 121 - Main Body; 13 - Adapter; 130 - First Connecting Part; 1300 - First Surface; 1301 - Second Surface; 131 - Second Connecting Part; 1310 - Fourth surface; 1311 - Sixth surface; 132 - Thickened portion; 1320 - Third surface; 1321 - Fifth surface; 14 - Electrode terminal; 140 - Seventh surface; 141 - Body; 142 - Flange; 15 - First insulating member; 15a - First groove; 150 - First protrusion; 1500 - First through hole; 151 - Protrusion; 16 - Second insulating member; 17 - First connecting member; 170 - Base; 171 - Limiting portion; 18 - First sealing member; 19 - Sealing member; z - Thickness direction of the first wall; y - First direction; x - Second direction. Detailed Implementation

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In this application, "multiple" means two or more (including two).

[0081] 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.

[0082] 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.

[0083] 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, helps prevent short circuits to some extent while allowing active ions to pass through.

[0084] 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.

[0085] 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.

[0086] 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.).

[0087] 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.

[0088] 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.

[0089] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0090] 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.).

[0091] 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.

[0092] 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.

[0093] 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.

[0094] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0095] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0103] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0104] 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.

[0105] 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.

[0106] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0107] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0108] In some implementations, the electrode assembly has a stacked structure.

[0109] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0110] 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.

[0111] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0112] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0113] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0114] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0115] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0122] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0123] 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 closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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, and discharge capacity. Furthermore, the charge and discharge performance of the battery device must also be taken into account.

[0128] In related technologies, a battery cell includes a casing, electrode assembly, and electrode terminals. The electrode terminals are electrically connected to the electrode assembly via an adapter. Generally, the adapter is welded to the electrode terminals, and to improve welding quality and efficiency, the adapter has a small thickness. However, the thickness affects the current-carrying area of ​​the adapter, creating a current bottleneck between the electrode terminals, the adapter, and the tabs of the electrode assembly. This affects the charge-discharge performance of the battery cell, and consequently, the charge-discharge performance of the battery device.

[0129] Based on the above considerations, to address the problem of overcurrent bottlenecks between the electrode terminals, the adapter, and the tabs of the electrode assembly due to the small thickness of the adapter, which affects the charge and discharge performance of the battery device, some embodiments of this application provide a battery cell. The battery cell includes a casing, an electrode assembly, electrode terminals, and an adapter. The casing has a first wall. The electrode assembly is disposed within the casing. The electrode terminals are insulated from the first wall. The adapter is disposed between the electrode assembly and the electrode terminals, and the electrode terminals are electrically connected to the tabs of the electrode assembly via the adapter. The adapter has a first connecting portion, a second connecting portion, and a thickened portion. The first connecting portion is connected to the electrode terminals, the second connecting portion is connected to the tabs, and the first and second connecting portions are connected by the thickened portion, the thickness of which is greater than the thickness of the first connecting portion.

[0130] In the above solution, by setting a thicker part to connect the first connection part and the second connection part, that is, by setting a thicker part with a larger thickness on the overcurrent path between the electrode post and the electrode tab, the local overcurrent area of ​​the adapter can be increased, thereby reducing the internal resistance of the battery cell and effectively improving the problem of overcurrent temperature rise. This makes the battery cell have higher reliability and charge / discharge performance, and thus makes the battery device have higher reliability and charge / discharge performance.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 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 operating power source or general power source for the vehicle 1000. 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.

[0135] 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.

[0136] Please refer to Figure 2, which is an exploded perspective view of the battery device 100 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] This application provides a battery cell 10 in some embodiments. Please refer to Figures 3-7. 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 a schematic diagram of the first wall 111 and the electrode terminal 14 in some embodiments of this application. Figure 6 is a schematic diagram of the internal structure of the battery cell 10 in some embodiments of this application. Figure 7 is a schematic diagram of the structure of the adapter 13 in some embodiments of this application.

[0144] The battery cell 10 includes a housing 11, an electrode assembly 12, electrode terminals 14, and an adapter 13. The housing 11 has a first wall 111. The electrode assembly 12 is disposed within the housing 11. The electrode terminals 14 are insulated from the first wall 111. The adapter 13 is disposed between the electrode assembly 12 and the electrode terminals 14, and the electrode terminals 14 are electrically connected to the tabs 120 of the electrode assembly 12 via the adapter 13. The adapter 13 has a first connecting portion 130, a second connecting portion 131, and a thickened portion 132. The first connecting portion 130 is connected to the electrode terminals 14, the second connecting portion 131 is connected to the tabs 120, and the first connecting portion 130 and the second connecting portion 131 are connected via the thickened portion 132, the thickness of which is greater than the thickness of the first connecting portion 130.

[0145] 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 shell structure, a cylindrical shell 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.

[0146] 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 12 and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can still protect the electrode assembly 12, and a sealing bag may be included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] The electrode assembly 12 has tabs 120 for inputting or outputting the positive or negative electrode of the electrode assembly 12. The tabs 120 are connected to the electrode terminals 14 via an adapter 13 to realize the electrical connection between the electrode assembly 12 and the electrode terminals 14.

[0155] In some embodiments, the tab 120 is located at one end of the electrode assembly 12 in the thickness direction z of the first wall, close to the first wall 111; or, the electrode assembly 12 has tabs 120 respectively at its two opposite ends in the thickness direction z of the first wall; or, the tab 120 is located on the side of the electrode assembly 12 along the thickness direction z of the first wall.

[0156] It should be noted that the tabs 120 of the electrode assembly 12 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the tabs 120 are used for the positive electrode of the output electrode assembly 12, then the tabs 120 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer; if the tabs 120 are used for the negative electrode of the output electrode assembly 12, then the tabs 120 are formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0157] 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.

[0158] In some embodiments, as shown in Figures 3-5, the battery cell 10 may further include a pressure relief mechanism 1112 disposed on the housing 11. The pressure relief mechanism 1112 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 1112 may be disposed on the end cap of the housing 11 or on the casing 110 of the housing 11.

[0159] Optionally, the pressure relief mechanism 1112 and the housing 11 can be an integrally formed structure or a separate structure. If the pressure relief mechanism 1112 and the housing 11 are separate structures, the pressure relief mechanism 1112 can be connected to the housing 11 by welding or other means. For example, the housing 11 has a pressure relief hole, and the pressure relief mechanism 1112 closes the pressure relief hole. Correspondingly, the pressure relief mechanism 1112 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 1112 and the housing 11 are an integrally formed structure, the pressure relief mechanism 1112 is a region on the housing 11 with a weak structure, such as a region on the housing 11 with a groove.

[0160] In some embodiments, as shown in Figures 3-5, the housing 11 may also be provided with an injection hole 1111 for injecting electrolyte, such as electrolyte solution, into the battery cell 10. Optionally, the injection hole 1111 may be provided on an end cap, or the injection hole 1111 may be provided on another wall portion of the housing 110. In some embodiments, after injection, the injection hole 1111 can be closed by a sealing member 19, which may include a plastic nail, an aluminum nail, or other structural components.

[0161] The electrode terminal 14 serves to output or input electrical energy of the battery cell 10. One end of the electrode terminal 14 is used to connect to the tab 120 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.

[0162] For example, the electrode terminal 14 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 14 can also be a composite material, that is, the electrode terminal 14 is formed by connecting two different metal materials, such as by hot pressing or cold pressing.

[0163] Referring to Figure 5, a terminal hole 1110 is provided on the first wall 111. The terminal penetrates through both sides of the first wall 111 along the thickness direction z. The electrode terminal 14 is inserted into the terminal hole 1110 along the thickness direction z of the first wall, so that part of the electrode terminal 14 is located in the terminal hole 1110. This allows the electrode terminal 14 to be connected to the electrode assembly 12 located inside the housing 11, as well as to the busbar located outside the housing 11, so as to realize the input or output of electrical energy of the battery cell 10.

[0164] The assembly relationship between the electrode terminal 14 and the first wall 111 is varied. For example, the electrode terminal 14 can be riveted to the first wall 111. For instance, the electrode terminal 14 may consist of two riveted parts that clamp the first wall 111. Alternatively, the electrode terminal 14 and the first wall 111 can be connected by other structural components. For example, the electrode terminal 14 may pass through a terminal hole 1110, and a first connector 17 may be welded to the first wall 111. The first connector 17 and the first wall 111 together clamp a portion of the electrode terminal 14 in the thickness direction z of the first wall, thereby assembling the electrode terminal 14.

[0165] In some embodiments, as shown in FIG4, the adapter 13 is disposed inside the housing 11, and the adapter 13 connects the electrode terminal 14 and the tab 120 of the electrode assembly 12 to realize the electrical connection between the electrode assembly 12 and the electrode terminal 14.

[0166] The adapter 13 can be made of various materials. For example, the electrode terminal 14 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the adapter 13 can also be made of composite materials, that is, the adapter 13 is formed by connecting two different metal materials, such as by hot pressing or cold pressing.

[0167] Optionally, the battery cell 10 further includes a first insulating member 15, which is a structural component disposed between the first wall 111 and the adapter 13. The first insulating member 15 serves to insulate and isolate the first wall 111 and the adapter 13. The first insulating member 15 has good insulation properties, and the material of the first insulating member 15 can be various, such as rubber, silicone, or plastic. In some embodiments, the first insulating member 15 may include plastic.

[0168] The adapter 13 includes a first connecting part 130, a second connecting part 131, and a thickened part 132. The first connecting part 130 is connected to the electrode terminal 14, the second connecting part 131 is connected to the tab 120, and the thickened part 132 connects the first connecting part 130 and the second connecting part 131. That is, the current between the electrode terminal 14 and the tab 120 will pass through the thickened part 132, and the current path between the electrode terminal 14 and the tab 120 includes the thickened part 132.

[0169] In some embodiments, the first connecting portion 130 can be directly or indirectly connected to the electrode terminal 14. For example, the first connecting portion 130 is directly connected to the electrode terminal 14, and the connection relationship between the two is diverse, including but not limited to welding, riveting, threaded connection or other connection methods. For example, the first connecting portion 130 and the electrode terminal 14 are connected by laser welding.

[0170] In some embodiments, the second connecting portion 131 can be directly or indirectly connected to the electrode tab 120. For example, the second connecting portion 131 can be directly connected to the electrode tab 120, and the connection relationship can be varied, including but not limited to welding, riveting, threaded connection, or other methods. For instance, the second connecting portion 131 and the electrode terminal 14 can be connected by ultrasonic welding. Alternatively, the second connecting portion 131 can be connected to the electrode tab 120 via other structural components, which can be connected to the electrode tab 120 by welding, riveting, threaded connection, or other methods.

[0171] In some embodiments, the first connecting portion 130, the second connecting portion 131, and the thickened portion 132 can be integrally formed or separate structures. Optionally, the first connecting portion 130, the second connecting portion 131, and the thickened portion 132 can be manufactured by die casting, casting, stamping, or other integral forming processes.

[0172] Optionally, when the first connecting part 130, the second connecting part 131, and the thickened part 132 are separate structures, the first connecting part 130, the second connecting part 131, and the thickened part 132 can be connected by welding, riveting, threaded connection, or other means.

[0173] In some embodiments, the first connecting portion 130, the second connecting portion 131, and the thickened portion 132 may be made of the same or different materials. Optionally, the first connecting portion 130, the second connecting portion 131, and the thickened portion 132 may all be made of aluminum, or the first connecting portion 130, the second connecting portion 131, and the thickened portion 132 may all be made of copper. Optionally, the first connecting portion 130 may be made of aluminum, the thickened portion 132 may be made of copper, and the second connecting portion 131 may be made of copper.

[0174] "The thickness of the thickened portion 132 is greater than the thickness of the first connecting portion 130" can be understood as the thickness of the thickened portion 132 being greater than the thickness of the first connecting portion 130 in the thickness direction of the adapter 13, that is, the thickness of the first connecting portion 130 being less than the thickness of the thickened portion 132. It can also be understood as the thickened portion 132 having a larger flow area.

[0175] In the above solution, by setting a thicker part 132 to connect the first connecting part 130 and the second connecting part 131, that is, by setting a thicker part 132 on the flow path between the terminal post and the tab 120, the local flow area of ​​the adapter 13 can be increased, thereby reducing the internal resistance of the battery cell 10, thus effectively improving the problem of overcurrent temperature rise, so that the battery cell 10 has high reliability and charge / discharge performance, and thus the battery device 100 has high reliability and charge / discharge performance.

[0176] According to some embodiments of this application, at least a portion of the thickened portion 132 is arranged around the outer periphery of the first connecting portion 130.

[0177] In some embodiments, along the circumference of the first connecting portion 130, a portion or all of the thickened portion 132 may be disposed around the outer periphery of the first connecting portion 130. Optionally, the first connecting portion 130 may be circular, triangular, square, or other shapes. Exemplarily, the first connecting portion 130 may be circular, and the thickened portion 132 may be disposed around the outer contour of the first connecting portion 130 one or less time.

[0178] In some embodiments, as shown in Figures 4 and 7, the thickened portion 132 surrounds the outer circumference of the first connecting portion 130 along the circumference of the first connecting portion 130.

[0179] Optionally, the second connecting portion 131 may be provided with one or less than one ring around the outer periphery of the thickened portion 132.

[0180] In the above solution, by encircling at least a portion of the thickened portion 132 around the outer periphery of the first connecting portion 130, the structural strength of the adapter 13 can be effectively improved, making the internal structure of the battery cell 10 stable and reliable, which is conducive to improving the reliability of the battery cell 10. On the other hand, the overcurrent area between the first connecting portion 130 and the second connecting portion 131 can be effectively increased, which can effectively improve the overcurrent bottleneck between the electrode assembly 12, the adapter 13 and the tab 120, thereby improving the reliability and charge / discharge performance of the battery cell 10, and further improving the reliability and charge / discharge performance of the battery device 100.

[0181] In some other embodiments, the first connecting portion 130, the thickened portion 132, and the second connecting portion 131 may be arranged in a certain direction, for example, the first connecting portion 130, the thickened portion 132, and the second connecting portion 131 may be arranged along the length direction of the first wall 111.

[0182] According to some embodiments of this application, please refer to FIG7, along the thickness direction z of the first wall, the first connecting portion 130 has a first surface 1300 facing the electrode assembly 12, and the thickened portion 132 protrudes from the first surface 1300.

[0183] The first surface 1300 can be the inner side of the first connecting portion 130. The first surface 1300 is disposed facing the electrode assembly 12. Understandably, the first surface 1300 can be the surface of the first connecting portion 130 that is closest to the electrode assembly 12.

[0184] "The thickened portion 132 protrudes from the first surface 1300" can be understood as the thickened portion 132 protruding from the first surface 1300 and being closer to the electrode assembly 12, as shown in Figure 7. The thickened portion 132 and the first surface 1300 together form a recess, and the first surface 1300 is the bottom surface of the recess.

[0185] In the above solution, by setting the thickened portion 132 to protrude from the first surface 1300, on the one hand, the difficulty of connecting the electrode terminal 14 and the first connecting portion 130 can be reduced, and the assembly efficiency of the battery cell 10 can be improved; on the other hand, a cavity can be formed between the thickened portion 132 and the first surface 1300 to accommodate more electrochemical substances, thereby improving the volumetric energy density of the battery cell 10 and the volumetric energy density of the battery device 100.

[0186] In other embodiments, the first surface 1300 may be flush with the side of the thickened portion 132 facing the electrode assembly 12, or the first surface 1300 may protrude from the side of the thickened portion 132 facing the electrode assembly 12.

[0187] According to some embodiments of this application, please refer to FIG7. Along the thickness direction z of the first wall, the first connecting portion 130 has a second surface 1301 facing away from the electrode assembly 12, and the thickened portion 132 has a third surface 1320 facing away from the electrode assembly 12. The second surface 1301 and the third surface 1320 are coplanar.

[0188] Along the thickness direction z of the first wall, the first connecting portion 130 has a first surface 1300 and a second surface 1301 that are opposite to each other. The second surface 1301 can be connected to the electrode terminal 14; exemplarily, the second surface 1301 can be laser welded to the motor terminal. The third surface 1320 can be the surface of the thickened portion 132 facing away from the electrode assembly 12. In the adapter 13, along the thickness direction z of the first wall, the third surface 1320 and the second surface 1301 are on the same side.

[0189] "The second surface 1301 and the third surface 1320 are coplanar" can be understood as the second surface 1301 and the third surface 1320 being on the same plane.

[0190] In some embodiments, the third surface 1320 of the thickened portion 132 may be in contact with the first insulating member 15.

[0191] In the above solution, by setting the second surface 1301 of the first connecting part 130 facing the electrode terminal 14 and the third surface 1320 of the thickened part 132 facing the electrode terminal 14 as coplanar, on the one hand, the thickened part 132 can have a larger flow area, which can improve the flow bottleneck problem between the electrode terminal 14, the adapter 13 and the tab 120. On the other hand, the side of the adapter 13 facing the electrode terminal 14 is relatively flat, which reduces the difficulty of connecting the electrode terminal 14 and the adapter 13, thereby improving the manufacturing efficiency of the battery cell 10.

[0192] In some embodiments, the thickness of the thickened portion 132 is greater than the thickness of the first connecting portion 130, the third surface 1320 may protrude from the second surface 1301, and the side of the thickened portion 132 facing the electrode assembly 12 may be recessed relative to the first surface 1300. In other embodiments, the thickness of the thickened portion 132 is greater than the thickness of the first connecting portion 130, the third surface 1320 may protrude from the second surface 1301, and the side of the thickened portion 132 facing the electrode assembly 12 may be flush with the first surface 1300. In other embodiments, the thickness of the thickened portion 132 is greater than the thickness of the first connecting portion 130, the third surface 1320 may protrude from the second surface 1301, and the side of the thickened portion 132 facing the electrode assembly 12 may protrude from the first surface 1300.

[0193] According to some embodiments of this application, the thickness of the first connecting portion 130 is not less than 0.6 mm and not more than 1.5 mm.

[0194] Please refer to Figure 7. The thickness h1 of the first connecting part 130 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or any value between two adjacent values.

[0195] In the above solution, on the one hand, by setting the thickness of the first connecting portion 130 to not less than 0.6 mm, the risk of excessive overcurrent temperature rise due to the first connecting portion 130 being too thin can be reduced, thus enabling the battery cell 10 to have high charge and discharge performance. On the other hand, by setting the thickness of the first connecting portion 130 to not more than 1.5 mm, the problem of excessive difficulty in connecting the first connector 17 and the electrode terminal 14 due to the first connecting portion 130 being too thick can be reduced, thus affecting the manufacturing efficiency of the battery cell 10. Therefore, by setting the thickness of the first connecting portion 130 to not less than 0.6 mm and not more than 1.5 mm, the charge and discharge performance and manufacturing efficiency of the battery cell 10 can be balanced.

[0196] In some other embodiments, the thickness h1 of the first connecting portion 130 may be in other ranges or other values ​​to meet the manufacturing, performance or usage requirements of the battery cell 10. For example, in some other embodiments, the thickness h1 of the first connecting portion 130 may be less than 0.6 mm or greater than 1.5 mm.

[0197] According to some embodiments of this application, please refer to FIG7, the thickness of the thickened portion 132 is not less than 0.8 mm and not more than 2.5 mm.

[0198] The thickness h2 of the thickened part 132 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm...2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm or any value between two adjacent values.

[0199] In the above solution, on the one hand, by setting the thickness of the thickened portion 132 to not less than 0.8 mm, the problem of overcurrent bottleneck between the electrode terminal 14, the adapter 13 and the tab 120 is improved, so that the battery cell 10 has high charge and discharge performance; on the other hand, by setting the thickness of the thickened portion 132 to not more than 2.5 mm, the risk of occupying the internal space of the battery cell 10 due to the excessive thickness of the thickened portion 132 can be reduced, so that the battery cell 10 has high volumetric energy density. Therefore, by setting the thickness of the thickened portion 132 to not less than 0.8 mm and not more than 2.5 mm, the charge and discharge performance and volumetric energy density of the battery cell 10 can be balanced.

[0200] In other embodiments, the thickness h2 of the thickened portion 132 may be in other ranges or other values ​​to meet the manufacturing, performance or usage requirements of the battery cell 10. For example, in other embodiments, the thickness h2 of the thickened portion 132 may be less than 0.8 mm or greater than 2.5 mm.

[0201] According to some embodiments of this application, please refer to FIG7, at least a portion of the second connecting portion 131 is arranged around the outer periphery of the thickened portion 132.

[0202] In some embodiments, along the circumference of the thickened portion 132, a portion or all of the second connecting portion 131 may be disposed around the outer periphery of the thickened portion 132. Optionally, the thickened portion 132 may have an outer contour shape that is circular, triangular, square, or other shapes. For example, the thickened portion 132 is annular and is disposed around the outer periphery of the first connecting portion 130, and the second connecting portion 131 may be disposed around the outer periphery of the thickened portion 132 one or less time.

[0203] In some embodiments, as shown in Figures 4 and 7, the second connecting portion 131 is arranged around the outer periphery of the thickened portion 132 along the circumference of the thickened portion 132.

[0204] In some embodiments, the tab 120 may be connected to the side of the second connection portion 131 facing the electrode assembly 12, for example, by ultrasonic welding. In other embodiments, the second connection portion 131 is connected to other structural members that are connected to the tab 120.

[0205] In some embodiments, the second connecting portion 131 may be plate-shaped, as shown in FIG7. The second connecting portion 131 is square plate-shaped and is integrally arranged around the outer periphery of the thickened portion 132.

[0206] In other embodiments, the second connecting portion 131 may include a first portion and a second portion. The first portion is square plate-shaped and is entirely arranged around the outer periphery of the thickened portion 132. The second portion is perpendicularly connected to the first portion and is used to connect with the electrode tab 120. For example, a connecting member is provided on the outer side of the second connecting portion 131 and the connecting member is connected to the electrode tab 120.

[0207] In the above solution, by circling at least a portion of the second connecting portion 131 around the outer periphery of the thickened portion 132, the structural strength of the adapter 13 can be improved, making the internal structure of the battery cell 10 stable and reliable. On the other hand, the current can flow effectively and stably through the thickened portion 132 between the first connecting portion 130 and the second connecting portion 131, so that the battery cell 10 has high charge and discharge performance.

[0208] According to some embodiments of this application, the thickness of the thickened portion 132 is greater than the thickness of the second connecting portion 131.

[0209] In the thickness direction of the adapter 13, the thickness of the thickened portion 132 is greater than the thickness of the second connecting portion 131. That is, the thickness of the second connecting portion 131 is less than the thickness of the thickened portion 132. It can also be understood that the flow area of ​​the thickened portion 132 is larger than the flow area of ​​the second connecting portion 131.

[0210] In the above solution, by setting a thicker part 132 to connect the first connecting part 130 and the second connecting part 131, that is, by setting a thicker part 132 on the flow path between the terminal post and the tab 120, the local flow area of ​​the adapter 13 can be increased, thereby reducing the internal resistance of the battery cell 10, thus effectively improving the problem of overcurrent temperature rise, so that the battery cell 10 has high reliability and charge / discharge performance, and thus the battery device 100 has high reliability and charge / discharge performance.

[0211] In other embodiments, the thickness of the thickened portion 132 may be equal to the thickness of the second connecting portion 131, or the thickness of the thickened portion 132 may be less than the thickness of the second connecting portion 131. In some embodiments, the tab 120 can be effectively connected to the adapter 13 by ultrasonic welding.

[0212] According to some embodiments of this application, the thickness of the second connecting portion 131 is not less than 0.8 mm and not more than 2.0 mm.

[0213] Please refer to Figure 7. The thickness h3 of the second connecting part 131 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm or any value between two adjacent values.

[0214] In the above solution, on the one hand, by setting the thickness of the second connecting portion 131 to not less than 0.8 mm, the risk of excessive overcurrent temperature rise due to the second connecting portion 131 being too thin can be reduced, thus enabling the battery cell 10 to have high charge and discharge performance. On the other hand, by setting the thickness of the second connecting portion 131 to not more than 2.0 mm, the problem of excessive difficulty in connecting the first connector 17 and the tab 120 due to the second connecting portion 131 being too thick can be reduced, thus affecting the manufacturing efficiency of the battery cell 10. Therefore, by setting the thickness of the first connecting portion 130 to not less than 0.8 mm and not more than 2.0 mm, the charge and discharge performance and manufacturing efficiency of the battery cell 10 can be balanced.

[0215] According to some embodiments of this application, along the thickness direction z of the first wall, the second connecting portion 131 has a fourth surface 1310 facing away from the electrode assembly 12, and the thickened portion 132 protrudes from the fourth surface 1310.

[0216] Please refer to Figure 7. The fourth surface 1310 is the surface of the second connection portion 131 facing the electrode terminal 14. Optionally, the fourth surface 1310 may be in contact with the first insulating member 15, or there may be a gap between the fourth surface 1310 and the first insulating member 15.

[0217] "The thickened portion 132 protrudes from the fourth surface 1310" can mean that the third surface 1320 protrudes from the fourth surface 1310 in the direction from the electrode assembly 12 to the first wall 111, or it can be understood that the thickened portion 132 is further away from the electrode assembly 12 than the fourth surface 1310 on the side opposite to the electrode assembly 12.

[0218] Optionally, the side of the second connecting portion 131 facing the electrode assembly 12 may protrude from the thickened portion 132 or from the first connecting portion 130.

[0219] Optionally, the side of the second connecting portion 131 facing the electrode assembly 12 may be flush with the side of the thickened portion 132 facing the electrode assembly 12.

[0220] Optionally, the side of the second connection portion 131 facing the electrode assembly 12 may be flush with the first surface 1300.

[0221] In the above solution, on the one hand, by setting the side of the second connecting portion 131 away from the electrode assembly 12 to be recessed relative to the thickened portion 132, the internal space occupied by the second connecting portion 131 of the battery cell 10 can be reduced, so that the battery cell 10 has a higher volumetric energy density; on the other hand, the side of the second connecting portion 131 facing the electrode assembly 12 can be flush with the side of the thickened portion 132 facing the electrode assembly 12, thereby reducing the difficulty of connecting with the tab 120, so that the tab 120 can be effectively electrically connected to the adapter 13, thereby improving the manufacturing efficiency and reliability of the battery cell 10.

[0222] According to some embodiments of this application, please refer to Figures 8 and 9. Figure 8 is a partial schematic diagram of the internal structure of the battery cell 10 in some embodiments of this application, and Figure 9 is a partial schematic diagram of the electrode terminal 14, the first wall 111, the first insulating member 15 and the adapter 13 in some embodiments of this application.

[0223] The battery cell 10 also includes a first insulating member 15, which is located between the first wall 111 and the adapter 13 along the thickness direction z of the first wall. A first groove 15a is formed on the side of the first insulating member 15 facing the adapter 13 along the thickness direction z of the first wall, and the portion of the thickened portion 132 protruding from the fourth surface 1310 is accommodated in the first groove 15a.

[0224] In some embodiments, a first insulating member 15 is provided between the first wall 111 and the adapter 13. The first insulating member 15 may be made of plastic and is used to insulate and isolate the first wall 111 and the adapter 13. In some embodiments, the first insulating member 15 may restrict the electrode assembly 12 from moving along the thickness direction z of the first wall.

[0225] Optionally, the first insulating member 15 has a first through hole 1500 through which the power supply terminal 14 passes, such that one end of the electrode terminal 14 is located on the side of the first insulating member 15 away from the electrode assembly 12 to pass through the first wall 111, and the other end of the electrode terminal 14 is located on the side of the first insulating member 15 facing the electrode assembly 12 to be able to connect with the adapter 13.

[0226] In some embodiments, a first groove 15a is formed on the side of the first insulating member 15 facing the adapter 13. The first groove 15a is used to accommodate the portion of the thickened portion 132 that protrudes from the second connecting portion 131. Optionally, the position of the first groove 15a corresponds to the position of the thickened portion 132 protruding from the second connecting portion 131, and the two fit together. Optionally, along the thickness direction z of the first wall, the projection of the wall surface surrounding the first groove 15a can cover the projection of the thickened portion 132. Optionally, along the thickness direction z of the first wall, the projection of the wall surface surrounding the first groove 15a can cover at least a portion of the projection of the thickened portion 132 and the projection of the second connecting portion 131. Referring to FIG9, the area of ​​the bottom wall of the first groove 15a is larger than the area of ​​the third surface 1320, and the projection of the bottom wall of the first groove 15a can cover a portion of the fourth surface 1310.

[0227] In the above solution, by providing a first groove 15a on the side of the first insulating member 15 facing the adapter 13 to accommodate the portion of the thickened part 132 protruding from the fourth surface 1310, on the one hand, the thickened part of the adapter 13 can utilize the space where the first insulating member 15 is located, thereby reducing the occupation of electrochemical substances inside the battery cell 10, thus effectively improving the volumetric energy density of the battery cell 10, and further effectively improving the volumetric energy density of the battery device 100; on the other hand, by providing the first groove 15a to accommodate the thickened part 132, it can play a role in assembly positioning, thereby reducing the assembly difficulty of the adapter 13 and improving the manufacturing efficiency of the battery cell 10.

[0228] According to some embodiments of this application, the bottom wall of the first groove 15a is provided with a first through hole 1500, through which the power supply terminal 14 passes.

[0229] The first groove 15a may be provided around the first through hole 1500. In some embodiments, the first insulating member 15 has a protrusion 151 formed on the side opposite to the adapter 13. The protrusion 151 is provided around the first through hole 1500 and may cover a portion of the outer peripheral surface of the electrode assembly 12.

[0230] In the above solution, by providing a first through hole 1500 on the bottom wall of the first groove 15a, a position can be provided for the junction of the electrode terminal 14 and the first connecting part 130, thereby reducing the difficulty of connecting the electrode terminal 14 and the adapter 13 to each other and improving the manufacturing efficiency of the battery cell 10.

[0231] According to some embodiments of this application, please refer to Figures 8 and 9. Along the thickness direction z of the first wall, a first protrusion 150 is formed on the side of the first insulating member 15 facing away from the adapter 13. On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the first protrusion 150 at least partially overlaps with the projection of the thickened portion 132. Along the thickness direction z of the first wall, a second groove 1113 is formed on the side of the first wall 111 facing the first insulating member 15, and at least a portion of the first protrusion 150 is accommodated in the second groove 1113.

[0232] In some embodiments, the first insulating member 15 has a first protrusion 150 formed on the side opposite to the adapter 13, protruding from other parts of the first insulating member 15 along the direction from the electrode assembly 12 toward the first wall 111. Optionally, the first through hole 1500 may penetrate the first protrusion 150. Optionally, the first through hole 1500 may not penetrate the first protrusion 150, that is, there are other parts of the first insulating member 15 between the first protrusion 150 and the first through hole 1500, and the first protrusion 150 protrudes from these other parts.

[0233] The statement "On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the first protrusion 150 and the projection of the thickened portion 132 at least partially overlap" can be understood as the projection of the first protrusion 150 covering the projection of the thickened portion 132, or the projection of the first protrusion 150 and the projection of the thickened portion 132 overlapping. Optionally, the projection of the first protrusion 150 completely covers the projection of the thickened portion 132. Optionally, the projection of the first protrusion 150 completely covers the projection of the thickened portion 132, and the projection of the first protrusion 150 also covers a portion of the projection of the second connecting portion 131.

[0234] In some embodiments, a second groove 1113 is formed on the side of the first wall 111 facing the adapter 13, and the second groove 1113 is used to receive at least a portion of the first protrusion 150. Optionally, the position of the second groove 1113 corresponds to the position of the first protrusion 150, and the two fit together. Optionally, along the thickness direction z of the first wall, the projection of the wall surface surrounding the second groove 1113 can cover the projection of the wall surface surrounding the first groove 15a. Optionally, along the thickness direction z of the first wall, the projection of the wall surface surrounding the second groove 1113 can cover the projection of the wall surface surrounding the first groove 15a and a portion of the projection of other parts of the first insulating member 15. Referring to FIG9, the area of ​​the bottom wall of the second groove 1113 is larger than the area of ​​the side of the first protrusion 150 facing the first wall 111.

[0235] In the above solution, on the one hand, by setting the first protrusion 150 at the position corresponding to the first groove 15a, the thickness of the first insulating member 15 can meet the insulation requirements, reduce the risk of internal short circuit in the battery cell 10, and make the battery cell 10 have high reliability; on the other hand, by setting the second groove 1113 on the inner side of the first wall 111, the first protrusion 150 can make good use of the space where the first wall 111 is located, thereby reducing the occupation of electrochemical substances inside the battery cell 10, thereby effectively improving the volumetric energy density of the battery cell 10, and thus effectively improving the volumetric energy density of the battery device 100.

[0236] According to some embodiments of this application, a second through hole is formed on the bottom wall of the second groove 1113, through which the power supply terminal 14 passes.

[0237] The second through hole can be a terminal hole 1110, which can be formed on the bottom wall of the second groove 1113.

[0238] In the above solution, by providing a second through hole on the bottom wall of the second groove 1113, a position can be provided for the junction of the electrode terminal 14 and the first connecting part 130, thereby reducing the difficulty of connecting the electrode terminal 14 and the adapter 13 to each other and improving the manufacturing efficiency of the battery cell 10.

[0239] In some other embodiments, the second groove 1113 may be spaced apart from the terminal hole 1110, that is, there are other parts of the first wall 111 between the groove sidewall of the second groove 1113 and the hole wall of the terminal hole 1110.

[0240] According to some embodiments of this application, the distance between the thickened portion 132 and the groove sidewall of the second groove 1113 along the radial direction of the electrode terminal 14 is not less than 0.5 mm and not more than 2 mm.

[0241] The statement that "the distance between the thickened portion 132 and the groove sidewall of the second groove 1113 along the radial direction of the electrode terminal 14 is not less than 0.5 mm and not more than 2 mm" can be understood as the diameter of the second groove 1113 of the first wall 111, which is used to avoid the first protrusion 150, is greater than the diameter of the thickened portion 132 of the adapter 13.

[0242] Please refer to Figure 9. The radial direction of electrode terminal 14 is perpendicular to the axial direction of electrode terminal 14. Along the radial direction of electrode terminal 14, the distance J between the thickened portion 132 and the groove sidewall of the second groove 1113 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm or any value between two adjacent values.

[0243] In the above solution, by setting the distance between the thickened portion 132 and the groove sidewall of the second groove 1113 to be no less than 0.5mm and no more than 2mm, on the one hand, it can meet the assembly of the first insulating member 15, so that the first insulating member 15 can effectively isolate the adapter 13 and the first wall 111, reduce the risk of internal short circuit in the battery cell 10, and make the battery cell 10 highly reliable; on the other hand, it can avoid to some extent the problem that the distance between the thickened portion 132 and the groove sidewall of the second groove 1113 is too large, which would lead to wasted internal space in the battery cell 10 and affect the volumetric energy density of the battery cell 10.

[0244] According to some embodiments of this application, please refer to FIG7, along the thickness direction z of the first wall, the thickened portion 132 has a fifth surface 1321 facing the electrode assembly 12, and the second connecting portion 131 has a sixth surface 1311 facing the electrode assembly 12, and the fifth surface 1321 and the sixth surface 1311 are coplanar.

[0245] The fifth surface 1321 is the surface of the electrode assembly 12 facing the adapter 13, and can be understood as the inner side surface of the thickened portion 132. The sixth surface 1311 is the surface of the second connecting portion 131 facing the electrode assembly 12, and can be understood as the inner side surface of the second connecting portion 131. In some embodiments, the fifth surface 1321 and the sixth surface 1311 are coplanar.

[0246] In the above solution, by setting the fifth surface 1321 of the thickened portion 132 to be flush with the sixth surface 1311 of the second connecting portion 131, the side of the adapter 13 facing the electrode assembly 12 can be made relatively flat, reducing the risk of damage to the structure of the electrode assembly 12 caused by the interference of the adapter 13 to the end face of the electrode assembly 12, making the internal structure of the battery cell 10 stable and reliable, and improving the reliability of the battery cell 10.

[0247] In other embodiments, the fifth surface 1321 and the sixth surface 1311 may not be coplanar. For example, along the thickness direction z of the first wall, the fifth surface 1321 protrudes from the sixth surface 1311, or the sixth surface 1311 protrudes from the fifth surface 1321.

[0248] According to some embodiments of this application, referring to FIG9, along the thickness direction z of the first wall, the first connecting portion 130 has a first surface 1300 facing the electrode assembly 12, and the electrode terminal 14 has a seventh surface 140 facing the adapter 13, the area of ​​the first surface 1300 being larger than the area of ​​the seventh surface 140.

[0249] The seventh surface 140 can be the surface of the electrode terminal 14 facing the electrode assembly 12. In some embodiments, the seventh surface 140 is connected to the first connection portion 130, for example, by laser welding the seventh surface 140 to the first connection portion 130.

[0250] The area of ​​the first surface 1300 is larger than the area of ​​the seventh surface 140. This can be understood as the size of the first connecting part 130 for welding with the electrode terminal 14 being larger than the size of the electrode terminal 14 for welding with the first connecting part 130.

[0251] In the above scheme, by setting the area of ​​the first surface 1300 to be larger than the area of ​​the seventh surface 140 of the electrode terminal 14, the first connecting part 130 can provide a larger connecting position for the electrode terminal 14, thereby enabling a stable connection between the electrode terminal 14 and the first connecting part 130, which is beneficial for the conduction of electrical energy between the electrode terminal 14 and the adapter 13.

[0252] In some other embodiments, the area of ​​the first surface 1300 is equal to the area of ​​the seventh surface 140. This can be understood as the size of the first connecting portion 130 for welding with the electrode terminal 14 being equal to the size of the electrode terminal 14 for welding with the first connecting portion 130.

[0253] According to some embodiments of this application, the battery cell 10 further includes a first connector 17, at least a portion of which is disposed on the outer periphery of the electrode terminal 14. The first connector 17 is used to fix the electrode terminal 14 to the first wall 111. On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the thickened portion at least partially overlaps with the projection of the first connector 17.

[0254] In this embodiment, the first connector 17 serves to fix the electrode terminal 14 to the first wall 111. The first connector 17 is connected to the first wall 111, that is, the first connector 17 is fastened to the first wall 111. The first connector 17 and the first wall 111 can be an integrally formed structure or a separate structure. For example, in FIG9, the first connector 17 and the first wall 111 are an integrally formed structure. Optionally, the first connector 17 and the first wall 111 are integrally formed by die casting, stamping, forging, 3D printing or other processes. Optionally, the first connector 17 and the first wall 111 are an integral structure. During the assembly of the battery cell 10, by acting on the first connector 17, such as bending, a portion of the first connector 17 can be changed in shape, thereby abutting a portion of the electrode terminal 14 against the first wall 111, thereby achieving clamping and fixing of the electrode terminal 14.

[0255] In some other embodiments, the first connector 17 and the first wall 111 are separate structures, and the first connector 17 is connected to the first wall 111 by a connection process, such as welding, bonding, snapping, riveting or threading.

[0256] In some embodiments, the first connector 17 and the first wall 111 are made of the same material. For example, both the first wall 111 and the first connector 17 are made of metal. For instance, the first wall 111 is made of aluminum and the first connector 17 is made of aluminum; or the first wall 111 is made of steel and the first connector 17 is made of steel.

[0257] In some embodiments, the first connector 17 and the first wall 111 are made of different materials. For example, the first wall 111 is made of metal, while the first connector 17 is made of non-metal. For example, the first wall 111 is made of aluminum, and the first connector 17 is made of plastic; or the first wall 111 is made of steel, and the first connector 17 is made of plastic.

[0258] At least a portion of the first connector 17 is disposed on the outer periphery of the electrode terminal 14, that is, the first connector 17 is a structure disposed on the outer periphery of the electrode terminal 14. The first connector 17 can be an annular structure disposed around the electrode terminal 14, or an intermittent structure disposed around the electrode terminal 14, or an arc-shaped structure extending circumferentially along the electrode terminal 14.

[0259] In some embodiments, referring to FIG9, at least a portion of the first insulating member 15 is disposed between the first connector 17 and the electrode terminal 14, and a second insulating member 16 is disposed therebetween. The second insulating member 16 may be made of plastic. Optionally, the entire second insulating member 16 is located between the first connector 17 and the electrode terminal 14, and the first connector 17 fixes the electrode terminal 14 to the first wall 111 through the second insulating member 16. Optionally, a portion of the second insulating member 16 is located between the electrode terminal 14 and the first connector 17, another portion of the second insulating member 16 is located between the first wall 111 and the electrode terminal 14, or another portion of the second insulating member 16 extends beyond the first connector 17 and is located on the outer periphery of the electrode terminal 14.

[0260] "On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the thickened portion 132 and the projection of the first connector 17 at least partially overlap" can be understood as at least a portion of the thickened portion 132 and at least a portion of the first connector 17 being arranged opposite each other along the thickness direction z of the first wall, and the portion of the electrode terminal 14 being located between at least a portion of the thickened portion 132 and at least a portion of the first connector 17.

[0261] In the above solution, by providing a first connector 17 on the outer periphery of the electrode terminal 14, the electrode terminal 14 is assembled with the first wall 111. Compared with the solution of riveting the electrode terminal 14 to the first wall 111, on the one hand, the assembly process of the electrode terminal 14 can be simplified, the conversion difficulty of the electrode terminal 14 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved; on the other hand, the space occupied by the electrode terminal 14 in the inner space of the outer casing 11 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; furthermore, by providing the thickened part 132 corresponding to the first connector 17, the supporting force of the adapter 13 on the electrode terminal 14 can be effectively improved, so that together with the first connector 17, the electrode terminal 14 can be stably clamped, making the battery cell 10 structurally stable and highly reliable.

[0262] According to some embodiments of this application, please refer to FIG9. The first connector 17 includes a base 170 and a limiting portion 171. The base 170 is connected to the first wall 111. The limiting portion 171 is connected to the base 170 and extends in a direction close to the electrode terminal 14. The limiting portion 171 is configured to restrict the electrode terminal 14 from moving away from the electrode assembly 12 along the thickness direction z of the first wall.

[0263] The base 170 of the first connector 17 is the part of the first connector 17 used to connect with the first wall 111, and one end of the base 170 can be connected to the outer surface of the first wall 111.

[0264] A limiting part 171 is provided at the other end of the base 170. The limiting part 171 is used to restrict the electrode terminal 14 from moving away from the electrode assembly 12 along the thickness direction z of the first wall. The limiting portion 171 of the first connector 17 restricts the movement of the electrode terminal 14 along the thickness direction z of the first wall away from the electrode assembly 12. There are various structures. For example, in FIG9, a portion of the electrode terminal 14 is located between the limiting portion 171 and the first wall 111 in the thickness direction z of the first wall, such that the limiting portion 171 and the first wall 111 are a structure that cooperates to clamp the electrode terminal 14, thereby restricting the movement of the electrode terminal 14 along the thickness direction z of the first wall away from the electrode assembly 12. In this case, a portion of the second insulating member 16 abuts between the limiting portion 171 and the electrode terminal 14 in the thickness direction z of the first wall. Of course, in other embodiments, the limiting portion 171 and the electrode terminal 14 may also be a structure in which the projections of the limiting portion 171 and the electrode terminal 14 in the thickness direction z of the first wall do not overlap. That is, the limiting portion 171 is a structure in which the electrode terminal 14 is indirectly pressed against the first wall 111 by the second insulating member 16.

[0265] The limiting part 171 is connected to the base 170 and extends in the direction close to the electrode terminal 14. It can be understood that the base 170 is disposed on the outer periphery of the electrode terminal 14, and the limiting part 171 is connected to the end of the base 170 and extends in the radial direction close to the electrode terminal 14 to achieve direct or indirect pressing of the electrode terminal 14.

[0266] Optionally, the base 170 is an annular structure with the outer side of the first wall 111 and surrounds the outer periphery of the electrode terminal 14. The limiting part 171 is the end of the base 170 that is opposite to the first wall 111. Along the circumference of the electrode terminal 14, the limiting part 171 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 171 can fall on the electrode terminal 14.

[0267] Optionally, the base 170 and the first wall 111 are integrally formed; or the base 170 and the first wall 111 are separate structures, which are connected by welding, bonding, riveting or other connection methods.

[0268] In the above scheme, the first connector 17 includes a base 170 and a limiting part 171. The base 170 is connected to the first wall 111. One end of the limiting part 171 is connected to the base 170, and the other end extends in the direction close to the electrode terminal 14, so that the limiting part 171 can cooperate with the first wall 111 to clamp and assemble the electrode terminal 14, restricting the displacement of the electrode terminal 14, thereby realizing the assembly of the electrode terminal 14. The scheme of using the limiting part 171 and the first wall 111 to clamp and assemble the electrode terminal 14 can effectively reduce the assembly difficulty of the electrode terminal 14, which is beneficial to improving the manufacturing efficiency of the battery cell 10. At the same time, it can also reduce the occupation of the internal space of the battery cell 10 by the electrode terminal 14 and the structural components used to realize the assembly of the electrode terminal 14, so that the battery cell 10 has a higher volumetric energy density, and thus the battery device 100 has a higher volumetric energy density.

[0269] According to some embodiments of this application, the electrode terminal 14 includes a body 141 and a flange 142. The body 141 is connected to the first connecting portion 130, and the flange 142 protrudes from the outer peripheral surface of the body 141. Along the thickness direction z of the first wall, at least a portion of the flange 142 is located between the limiting portion 171 and the first wall 111.

[0270] The main body 141 is the main structure of the electrode terminal 14, 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 142 is a structure that protrudes from the outer peripheral surface of the main body 141. The flange 142 can be used for the assembly of the electrode terminal 14 and the first wall 111.

[0271] In some embodiments, along the thickness direction z of the first wall, the flange 142 may be located between opposite ends of the body 141. In other embodiments, along the thickness direction z of the first wall, the flange 142 may be located at one end of the body 141 facing the electrode assembly 12, with the side of the flange 142 facing the electrode assembly 12 flush with the side of the body 141 facing the electrode assembly 12.

[0272] In some embodiments, the limiting portion 171 acts directly or indirectly on the flange 142 to abut the flange 142 against the first wall 111, thereby limiting the displacement of the electrode terminal 14 along the thickness direction z of the first wall.

[0273] In some embodiments, a portion of the flange 142 is located between the limiting portion 171 and the first wall 111 along the thickness direction z of the first wall. In other embodiments, the entire flange 142 is located between the limiting portion 171 and the first wall 111 along the thickness direction z of the first wall.

[0274] In the above scheme, the electrode terminal 14 includes a body 141 and a flange 142. The limiting part 171 and the bottom wall are located on both sides of the flange 142 to realize the clamping and assembly of the electrode terminal 14, thereby enabling the electrode terminal 14 to be effectively assembled on the first wall 111 and having high structural stability.

[0275] According to some embodiments of this application, the battery cell 10 further includes a first seal 18. Along the thickness direction z of the first wall, at least a portion of the first seal 18 is disposed between the first wall 111 and the flange 142. On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the first seal 18 at least partially overlaps with the projection of the thickened portion 132.

[0276] The first sealing element 18 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 18 includes but is not limited to plastic or silicone.

[0277] In some embodiments, along the thickness direction z of the first wall, a portion of the first seal 18 is located between the first wall 111 and the flange 142, and another portion of the first seal 18 is located at other locations, such as between the first wall 111 and the body 141.

[0278] In other embodiments, the entire first seal 18 is located between the first wall 111 and the flange 142 along the thickness direction z of the first wall.

[0279] The statement "On the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the first seal 18 and the projection of the thickened portion 132 at least partially overlap" can be understood as at least a portion of the thickened portion 132 and at least a portion of the first seal 18 being disposed opposite each other along the thickness direction z of the first wall. Optionally, on the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the first seal 18 is completely covered by the projection of the thickened portion 132. Optionally, on the same projection plane perpendicular to the thickness direction z of the first wall, a portion of the projection of the first seal 18 is covered by the projection of the thickened portion 132.

[0280] In the above solution, by setting the first sealing element 18, on the one hand, the risk of electrolyte leakage from between the first wall 111 and the flange 142 to the outside of the battery cell 10 can be reduced, thus improving the reliability of the battery cell 10; on the other hand, it can also serve to insulate and isolate the flange 142 and the first wall 111, reducing the risk of internal short circuits in the battery cell 10, thus improving the reliability of the battery cell 10; furthermore, by setting the projection of the first sealing element 18 to at least partially overlap with the projection of the thickened portion 132, the thicker part of the adapter 13 can effectively support the first sealing element 18, thereby giving the first sealing element 18 better sealing performance, reducing the risk of electrolyte leakage, and improving the reliability of the battery cell 10.

[0281] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the thickened portion 132 overlaps with the projection of the tab 120.

[0282] In some embodiments, a portion of the tab 120 may extend into the thickened portion 132 and be located on the side of the thickened portion 132 facing the electrode assembly 12. Optionally, the portion of the tab 120 located on the side of the thickened portion 132 facing the electrode assembly 12 may be in contact with the thickened portion 132.

[0283] In the above scheme, by setting the projections of the tab 120 and the thickened portion 132 to partially overlap, a larger electrical connection area can be achieved between the tab 120 and the adapter 13, which is beneficial to improving the charging and discharging performance of the battery cell 10 and the charging and discharging performance of the battery device 100.

[0284] In some other embodiments, the projection of the thickened portion 132 does not overlap with the projection of the tab 120 on the same projection plane in the thickness direction z perpendicular to the first wall.

[0285] According to some embodiments of this application, the structural strength of the adapter 13 is greater than the structural strength of the first wall 111.

[0286] In some embodiments, the structural strength of the adapter 13 is greater than that of the first wall 111. For example, the adapter 13 is made of copper and the first wall 111 is made of aluminum.

[0287] In the above scheme, by setting the structural strength of the adapter 13 to be greater than that of the first wall 111, the adapter 13 can provide greater support for the electrode terminal 14 or other structural components on the first wall 111, so as to improve the impact of the first wall 111 on the volumetric energy density of the battery cell 10 in order to meet the strength requirements.

[0288] According to some embodiments of this application, please refer to FIG4, the electrode assembly 12 includes a main body 121, and an electrode tab 120 is disposed at one end of the main body 121 facing the first wall 111 along the thickness direction z of the first wall.

[0289] The main body 121 is the main part of the electrode assembly 12. The main body 121 can be formed by winding or stacking positive electrode plates, negative electrode plates, and separators.

[0290] In some embodiments, the direction of the output tab 120 of the electrode assembly 12 is the direction of the main body 121 toward the first wall 111.

[0291] In some other embodiments of this application, the tab 120 is disposed on the side of the main body 121 along a first direction y, the first direction y being perpendicular to the thickness direction z of the first wall.

[0292] In some other embodiments, the tabs 120 of the electrode assembly 12 are oriented laterally along the first direction y, that is, the tabs 120 are not oriented towards the first wall 111. Optionally, the tabs 120 of the electrode assembly 12 are located on both sides of the main body 121 along the first direction y. In some other embodiments, the second connecting portion 131 of the adapter 13 includes a first portion and a second portion arranged perpendicularly to each other. The first portion is located between the first wall 111 and the electrode assembly 12, and the second portion is located between the side wall of the housing 11 and the electrode assembly 12. The second portion is connected to the tabs 120 via a connecting member.

[0293] In some embodiments of the above scheme, by placing the tab 120 at the end of the main body 121 facing the first wall 111, the difficulty of connecting the tab 120 and the adapter 13 can be reduced, which is beneficial to improving the manufacturing efficiency of the battery cell 10. In some embodiments, by placing the tab 120 on the side of the main body 121, the width of the tab 120 can be designed to be larger, thereby increasing the current flow area of ​​the tab 120, and thus improving the charging and discharging performance of the battery cell 10 and the battery device 100.

[0294] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0295] 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.

[0296] 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.

[0297] The battery cell 10 provided by the above solution has high charge and discharge performance and reliability. In particular, when the capacity of the battery cell 10 is greater than or equal to 500Ah, it can effectively improve the charging rate of the battery, thereby meeting the charging and discharging requirements of large-capacity batteries.

[0298] According to some embodiments of this application, please refer to FIG10, which is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0299] The outer shell 11 is a square shell. The dimension of the outer shell 11 in the first direction y is W1, the dimension of the outer shell 11 in the second direction x is T1, 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 y, the second direction x and the third direction are mutually perpendicular.

[0300] The first direction y can be the width direction of the battery cell 10, the second direction x can be the thickness 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.

[0301] The statement “The size of the outer casing 11 in the first direction y is W1, the size of the outer casing 11 in the second direction x is T1, and the size of the outer casing 11 in the third direction is H1” can be understood as the width of the outer casing 11 of the battery cell 10 being W1, the thickness being T1, and the height being H1.

[0302] In some embodiments, a width of W1, a thickness of T1, and a height of H1 for the outer casing 11 can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0308] 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.

[0309] 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.

[0310] As shown in Figure 2, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0311] 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.

[0312] Optionally, the second box body 22 can be a hollow structure open at one end, 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. Alternatively, both the first box body 21 and the second box body 22 can be hollow structures open on one side, with the open side of the first box body 21 covering the open side of the second box body 22. 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.

[0313] 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. The 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. The battery device 100 may also include other structures; for example, it may include a busbar component that connects the multiple battery cells 10 to achieve electrical connection between them. 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.

[0314] 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.

[0315] 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.

[0316] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 3-9.

[0317] The battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 14, an adapter 13, a first insulating component 15, a second insulating component 16, and a first sealing component 18.

[0318] The housing 11 may include a housing 110 and a first wall 111. The housing 110 has an opening, through which the electrode assembly 12 can be inserted into the housing 110. The first wall 111 is connected to the housing 110 and closes the opening, so that the electrode assembly 12 is in a closed space.

[0319] There are two electrode terminals 14, with opposite polarities. One terminal is positive and electrically connected to the positive terminal of the electrode assembly 12, and the other is negative and electrically connected to the negative terminal of the electrode assembly 12. The electrode terminals 14 are disposed on the first wall 111 via a second insulating member 16. There are two adapters 13, one corresponding to the positive terminal and the other to the negative terminal. A first insulating member 15 is disposed between the first wall 111 and the adapters 13.

[0320] Referring to Figure 7, the adapter 13 includes a first connecting portion 130, a second connecting portion 131, and a thickened portion 132. The first connecting portion 130 is connected to the electrode terminal 14, for example, by laser welding. The second connecting portion 131 is connected to the tab 120, for example, by ultrasonic welding. The first connecting portion 130 and the second connecting portion 131 are connected by the thickened portion 132. In some embodiments, the thickened portion 132 surrounds the outer periphery of the first connecting portion 130, and the second connecting portion 131 surrounds the outer periphery of the thickened portion 132. The thickness of the thickened portion 132 is greater than the thickness of the first connecting portion 130, and the thickness of the thickened portion 132 is greater than the thickness of the second connecting portion 131.

[0321] By providing a thicker portion 132 to connect the first connecting portion 130 and the second connecting portion 131, that is, by providing a thicker portion 132 on the overcurrent path between the terminal post and the tab 120, the local overcurrent area of ​​the adapter 13 can be increased, thereby reducing the internal resistance of the battery cell 10 and effectively improving the overcurrent temperature rise problem. This results in the battery cell 10 having higher reliability and charge / discharge performance, and consequently, the battery device 100 having higher reliability and charge / discharge performance.

[0322] In some embodiments, a thickened portion 132 protrudes from the second connecting portion 131 along the direction of the electrode assembly 12 toward the first wall 111. Referring to FIG9, a first groove 15a is formed on the side of the first insulating member 15 facing the electrode assembly 12, and the first groove 15a is used to receive the portion of the thickened portion 132 protruding from the second connecting portion 131. A first protrusion 150 is formed on the side of the first insulating member 15 away from the electrode assembly 12, and a second groove 1113 is formed on the side of the first wall 111 facing the first insulating member 15, at least a portion of the first protrusion 150 is received in the second groove 1113. By providing the first groove 15a and the second groove 1113, the spatial layout of the internal structure of the battery cell 10 can be compacted, reducing the space occupied by the thickened portion 132 and the first protrusion 150 in the internal space of the battery cell 10, thereby facilitating the improvement of the volumetric energy density of the battery cell 10, and further facilitating the improvement of the volumetric energy density of the battery device 100.

[0323] 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 insulated from the first wall; An adapter is disposed between the electrode assembly and the electrode terminal, wherein the electrode terminal is electrically connected to the tab of the electrode assembly via the adapter; The adapter has a first connecting part, a second connecting part, and a thickened part. The first connecting part is connected to the electrode terminal, the second connecting part is connected to the electrode tab, and the first connecting part and the second connecting part are connected through the thickened part. The thickness of the thickened part is greater than the thickness of the first connecting part.

2. The battery cell according to claim 1, wherein, At least a portion of the thickened portion is arranged around the outer periphery of the first connecting portion.

3. The battery cell according to claim 1 or 2, wherein, Along the thickness direction of the first wall, the first connecting portion has a first surface facing the electrode assembly, and the thickened portion protrudes from the first surface.

4. The battery cell according to any one of claims 1-3, wherein, Along the thickness direction of the first wall, the first connecting portion has a second surface facing away from the electrode assembly, and the thickened portion has a third surface facing away from the electrode assembly, wherein the second surface and the third surface are coplanar.

5. The battery cell according to any one of claims 1-4, wherein, The thickness of the first connecting part is not less than 0.6 mm and not more than 1.5 mm.

6. The battery cell according to any one of claims 1-5, wherein, The thickness of the thickened portion is not less than 0.8 mm and not more than 2.5 mm.

7. The battery cell according to any one of claims 1-6, wherein, At least a portion of the second connecting portion is arranged around the outer periphery of the thickened portion.

8. The battery cell according to any one of claims 1-7, wherein, The thickness of the thickened portion is greater than the thickness of the second connecting portion.

9. The battery cell according to claim 8, wherein, The thickness of the second connecting part is not less than 0.8 mm and not more than 2.0 mm.

10. The battery cell according to claim 8 or 9, wherein, Along the thickness direction of the first wall, the second connecting portion has a fourth surface facing away from the electrode assembly, and the thickened portion protrudes from the fourth surface.

11. The battery cell according to claim 10, wherein, The battery cell further includes a first insulating member, which is located between the first wall and the adapter along the thickness direction of the first wall. Along the thickness direction of the first wall, a first groove is formed on the side of the first insulating member facing the adapter, and the portion of the thickened part protruding from the fourth surface is accommodated in the first groove.

12. The battery cell according to claim 11, wherein, The bottom wall of the first groove is provided with a first through hole, through which the electrode terminal passes.

13. The battery cell according to claim 11 or 12, wherein, Along the thickness direction of the first wall, a first protrusion is formed on the side of the first insulating member opposite to the adapter. On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the first protrusion at least partially overlaps with the projection of the thickened portion. Along the thickness direction of the first wall, a second groove is formed on the side of the first wall facing the first insulating member, and at least a portion of the first protrusion is accommodated in the second groove.

14. The battery cell according to claim 13, wherein, The bottom wall of the second groove has a second through hole through which the electrode terminal passes.

15. The battery cell according to claim 13 or 14, wherein, Along the radial direction of the electrode terminal, the distance between the thickened portion and the groove sidewall of the second groove is not less than 0.5 mm and not more than 2 mm.

16. The battery cell according to any one of claims 1-15, wherein, Along the thickness direction of the first wall, the thickened portion has a fifth surface facing the electrode assembly, and the second connecting portion has a sixth surface facing the electrode assembly, wherein the fifth surface and the sixth surface are coplanar.

17. The battery cell according to any one of claims 1-16, wherein, Along the thickness direction of the first wall, the first connecting portion has a first surface facing the electrode assembly, and the electrode terminal has a seventh surface facing the adapter, wherein the area of ​​the first surface is larger than the area of ​​the seventh surface.

18. The battery cell according to any one of claims 1-17, 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, and the first connector is used to fix the electrode terminal to the first wall; On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the thickened portion at least partially overlaps with the projection of the first connector.

19. The battery cell according to claim 18, 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.

20. The battery cell according to claim 19, wherein, The electrode terminal includes a body and a flange. The body is connected to the first connecting portion, and the flange protrudes from the outer peripheral surface of the body. 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.

21. The battery cell according to claim 20, wherein, The battery cell further includes a first seal, at least a portion of which is disposed between the first wall and the flange along the thickness direction of the first wall. On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the first seal at least partially overlaps with the projection of the thickened portion.

22. The battery cell according to any one of claims 1-21, wherein, On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the thickened portion overlaps with the projection of the tab.

23. The battery cell according to any one of claims 1-22, wherein, The structural strength of the adapter is greater than that of the first wall.

24. The battery cell according to any one of claims 1-23, wherein, The electrode assembly includes a main body portion, and along the thickness direction of the first wall, the electrode tab is disposed at one end of the main body portion facing the first wall; or, the electrode tab is disposed on the side of the main body portion along a first direction, the first direction being perpendicular to the thickness direction of the first wall.

25. The battery cell according to any one of claims 1-24, wherein, The capacity of the battery cell is greater than or equal to 500Ah.

26. The battery cell according to claim 25, wherein, The outer casing is a square casing. The dimension of the outer casing in the first direction is W1, the dimension in the second direction is T1, 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.

27. The battery cell according to any one of claims 1-26, wherein, The outer shell is made of steel.

28. A battery device, wherein, Includes the battery cell described in any one of claims 1-27.

29. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-27, and / or the battery device according to claim 28, wherein the battery cell is used to provide electrical energy.

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