Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing, an electrode assembly, an electrode terminal, a current collecting member, and an insulator. The electrode assembly has a tab. The electrode terminal is disposed on a wall portion of the housing. The current collecting component is arranged between the wall part and the electrode assembly, the current collecting component comprises a first connecting area and a second connecting area which are connected with each other, the first connecting area is connected with the electrode terminal, and the second connecting area is connected with the tab. The insulator is disposed between the wall portion and the second connection region. An insulating layer is arranged on the second connecting area, the insulating layer covers at least part of the surface, facing the insulating piece in the thickness direction of the wall part, of the second connecting area, and the melting point of the material of the insulating layer is larger than that of the material of the insulating piece. After the insulating part is melted at high temperature, the insulating layer can play an insulating and isolating role between the wall part and the second connecting area, and the phenomenon that the second connecting area is in lap joint with the wall part can be reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of stability and reliability in use.

[0003] In battery technology, in order to reduce the assembly difficulty of battery cells, current collectors are usually set inside the casing of the battery cell to connect the electrode terminals of the battery cell and the tabs of the electrode assembly. However, existing battery cells are prone to the risk of current collectors and casings overlapping during use, which may cause short circuits in the battery cell, or even cause fires or explosions, thus hindering the improvement of the reliability of the battery cells. Utility Model Content

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

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, electrode terminals, a current collector, and an insulating member; the casing has a wall portion; the electrode assembly is housed within the casing and has tabs; the electrode terminals are disposed on the wall portion; the current collector is disposed between the wall portion and the electrode assembly, the current collector including a first connection area and a second connection area interconnected, the first connection area connecting to the electrode terminals, and the second connection area connecting to the tabs; the insulating member is disposed on the side of the wall portion facing the electrode assembly to insulate and isolate the wall portion and the second connection area; wherein, an insulating layer is disposed on the second connection area, the insulating layer covering at least a portion of the surface of the second connection area facing the insulating member in the thickness direction of the wall portion, and the melting point of the insulating layer material is greater than the melting point of the insulating member material.

[0006] In the above technical solution, the current collector has a first connection area and a second connection area that are interconnected. The first connection area is connected to the electrode terminal, and the second connection area is connected to the tab of the electrode assembly to realize the electrical connection between the electrode assembly and the electrode terminal. In this solution, an insulating layer is provided on the second connection area of ​​the current collector. The insulating layer covers at least a portion of the surface of the second connection area facing the insulating element in the thickness direction of the wall. The melting point of the insulating layer material is greater than that of the insulating element material, making the insulating layer more difficult to melt than the insulating element. This ensures that even if the battery cell experiences thermal runaway or the insulating element melts due to high temperature during use, the insulating layer can still provide a certain degree of insulation between the wall and the second connection area of ​​the current collector. This reduces the phenomenon of the second connection area of ​​the current collector directly overlapping with the wall after deformation under the pressure of the electrode assembly after the insulating element melts at high temperature. This reduces the risk of short circuit between the current collector and the wall, thereby effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell during use, which is beneficial to improving the reliability of the battery cell.

[0007] In some embodiments, the first connection region and the second connection region are arranged along a first direction, and the insulating layer covers at least a portion of the end face of the second connection region away from the first connection region in the first direction, wherein the first direction is perpendicular to the thickness direction of the wall portion.

[0008] In the above technical solution, by setting the insulating layer to cover at least a portion of the end face of the second connection area away from the first connection area in the first direction, the end face of the second connection area away from the first connection area in the first direction is also provided with an insulating layer. This reduces the phenomenon of direct overlap between the end face of the second connection area of ​​the current collector and the wall after the insulating component is melted at high temperature. This is beneficial to improving the insulating effect of the insulating layer in isolating the second connection area from the wall, thereby further reducing the risk of short circuit between the current collector and the wall.

[0009] In some embodiments, the insulating layer covers at least a portion of the second connection area on the surface of the wall portion that is away from the surface of the insulating member in the thickness direction.

[0010] In the above technical solution, by setting the insulating layer to cover at least a portion of the surface of the second connection area away from the insulating member in the thickness direction of the wall, the second connection area is provided with insulating layers on both sides in the thickness direction of the wall. This further reduces the phenomenon of direct overlap between the second connection area of ​​the current collector and the wall after the insulating member is melted at high temperature, thereby further reducing the risk of short circuit between the current collector and the wall.

[0011] In some embodiments, the first connection region and the second connection region are arranged along a first direction, and the insulating layer covers at least a portion of the surface of at least one side of the second connection region in a second direction, wherein the first direction, the second direction and the thickness direction of the wall are perpendicular to each other.

[0012] In the above technical solution, by setting the insulating layer to cover at least a portion of the surface of at least one side of the second connection area in the second direction, the insulating layer is also provided on the surface of at least one side of the second connection area in the second direction. This reduces the phenomenon of direct overlap between the surface of the second connection area of ​​the current collector and the wall after the insulating component is melted at high temperature. This is beneficial to improving the insulating effect of the insulating layer in isolating the second connection area from the wall, thereby further reducing the risk of short circuit between the current collector and the wall.

[0013] In some embodiments, the insulating layer covers at least a portion of the surface of the second connection region on both sides in the second direction.

[0014] In the above technical solution, by setting the insulating layer to cover at least a portion of the surfaces on both sides of the second connection area in the second direction, the insulating layer is provided on both sides of the second connection area in the second direction. This further reduces the phenomenon of direct overlap between the surfaces on both sides of the second connection area of ​​the current collector and the wall after the insulating component is melted at high temperature. This is beneficial to further improve the insulating effect of the insulating layer in isolating the second connection area from the wall, thereby further reducing the risk of short circuit between the current collector and the wall.

[0015] In some embodiments, the first connection region and the second connection region are arranged along a first direction, and the insulating layer surrounds and forms an assembly cavity with a first opening, the first opening being located on one side of the insulating layer in the first direction; wherein, along the first direction, one end of the second connection region away from the first connection region is inserted into the assembly cavity.

[0016] In the above technical solution, an insulating layer encloses and forms an assembly cavity, and a first opening communicating with the assembly cavity is formed on one side of the insulating layer in the first direction. By inserting the end of the second connection region away from the first connection region in the first direction into the assembly cavity through the first opening, all five outer surfaces of the end of the second connection region away from the first connection region in the first direction are covered with the insulating layer. This structure in the battery cell reduces the difficulty of setting the insulating layer on the second connection region and improves the stability and reliability of the insulating layer on the second connection region. Furthermore, it enhances the stability and reliability of the second connection region in the electrode assembly. An insulating layer is applied to the area most likely to overlap with the wall after deformation under compression. This ensures that in the event of thermal runaway of the battery cell or melting of the insulating component due to high temperature during use, the insulating layer provides better insulation and isolation between the second connection area and the wall. After the insulating component melts at high temperature, the phenomenon of direct overlap between the second connection area of ​​the current collector and the wall can be further reduced, thereby further reducing the risk of short circuit between the current collector and the wall. This further reduces the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell during use, which is conducive to further improving the reliability of the battery cell.

[0017] In some embodiments, along the thickness direction of the wall portion, the insulating layer has a first insulating portion located on the surface of the second connection area facing the insulating member, the thickness of the first insulating portion being D, satisfying 0.2mm≤D≤2mm.

[0018] In the above technical solution, by setting the thickness of the first insulating portion on the surface of the second connection area facing the insulating layer to 0.2mm to 2mm, on the one hand, setting the thickness of the first insulating portion to be greater than or equal to 0.2mm increases the creepage distance between the second connection area and the wall portion, which is beneficial to improving the insulating isolation effect of the insulating layer on the wall portion and the second connection area. On the other hand, setting the thickness of the first insulating portion to be less than or equal to 2mm alleviates the phenomenon of excessive space occupied by the insulating layer, thereby improving the internal space utilization rate of the battery cell, increasing the energy density of the battery cell, and reducing the phenomenon of excessive material waste, thereby reducing the manufacturing cost of the battery cell.

[0019] In some embodiments, the insulating layer is made of a material with a melting point greater than or equal to 250°C.

[0020] In the above technical solution, by setting the melting point of the insulating layer material to be greater than or equal to 250°C, the insulating layer has better high-temperature resistance, which helps to reduce the phenomenon of the insulating layer melting during the thermal runaway of the battery cell or during use. Thus, even after the insulating component melts due to thermal runaway of the battery cell, the insulating layer can still provide good insulation and isolation for the second connection area and the wall, further reducing the phenomenon of direct overlap between the second connection area of ​​the current collector and the wall. This further reduces the risk of internal short circuit or fire and explosion caused by short circuit when the battery cell experiences thermal runaway, which helps to further improve the reliability of the battery cell.

[0021] In some embodiments, the resistivity of the insulating layer is greater than or equal to 100 MΩ.

[0022] In the above technical solution, by setting the resistance of the insulating layer material to be greater than or equal to 100MΩ, the insulating layer has better insulation performance, which is beneficial to further improve the effect of the insulating isolation wall and the second connection area of ​​the current collecting component.

[0023] In some embodiments, a gap is formed between the second connection area and the insulating member along the thickness direction of the wall portion.

[0024] In the above technical solution, by forming a gap between the second connection area and the insulating component, the second connection area and the insulating component are arranged at intervals along the thickness direction of the wall, which facilitates the setting of an insulating layer on the surface of the second connection area facing the insulating component. This helps to reduce interference between the insulating layer and the insulating component, thereby reducing the assembly difficulty of the battery cell.

[0025] In some embodiments, along the thickness direction of the wall portion, the size of the gap between the second connection area and the insulating member is L, and the insulating layer has a first insulating portion located on the surface of the second connection area facing the insulating member, the thickness of the first insulating portion being D, satisfying L≥D.

[0026] In the above technical solution, by setting the dimension L of the gap between the second connection area and the insulating member in the thickness direction of the wall portion to be greater than or equal to the thickness D of the first insulating portion on the surface of the second connection area facing the insulating member, the difficulty of setting the insulating layer on the surface of the second connection area facing the insulating member can be further reduced, which is beneficial to further reduce the interference phenomenon between the insulating layer and the insulating member, so as to further reduce the assembly difficulty of the battery cell.

[0027] In some embodiments, along the thickness direction of the wall portion, the size of the gap between the second connection area and the insulating member is L, satisfying 0.1mm≤L≤2mm.

[0028] In the above technical solution, by setting the gap between the second connection area and the insulating component to 0.1mm to 2mm in the thickness direction of the wall, it can alleviate the problem of excessive assembly difficulty between the first connection area of ​​the current collector and the electrode terminal caused by the gap being too small, and also alleviate the problem of excessive difficulty in setting the insulating layer on the side of the second connection area of ​​the current collector facing the insulating component, thereby reducing the assembly difficulty of the battery cell. On the other hand, it can alleviate the problem of wasted space caused by the gap being too large, which is conducive to improving the internal space utilization of the battery cell and thus improving the energy density of the battery cell.

[0029] In some embodiments, the first connection region and the second connection region are arranged along a first direction, the battery cell includes a plurality of electrode components, the plurality of electrode components are stacked along a second direction, and the first direction, the second direction and the thickness direction of the wall are perpendicular to each other; wherein, the current collector includes a plurality of second connection regions, the plurality of second connection regions are all connected to one end of the first connection region in the first direction, and the plurality of second connection regions are spaced apart along the second direction, and each second connection region is connected to the tab of at least one of the electrode components.

[0030] In the above technical solution, the current collector is provided with multiple second connection areas, each of which is connected to one side of the first connection area in the first direction. The multiple second connection areas are spaced apart along the second direction, so that each second connection area can be connected to the tab of at least one electrode assembly. This enables multiple electrode assemblies stacked along the second direction to be connected to one electrode terminal after being combined by a current collector, thereby achieving a large capacity battery cell while reducing the assembly difficulty and manufacturing cost of the battery cell.

[0031] In some embodiments, the current collector further includes a bending region connecting the first connection region and the second connection region; wherein, along the thickness direction of the wall, the surface of the first connection region facing the wall is further away from the wall than the surface of the second connection region facing the wall, and the surface of the first connection region facing the wall is connected to the electrode terminal.

[0032] In the above technical solution, the current collector is also provided with a bending area, and the first connection area and the second connection area are connected by the bending area. This allows the surface of the first connection area facing the wall to be set further away from the wall in the thickness direction of the wall than the surface of the second connection area facing the wall. After the electrode terminal is connected to the surface of the first connection area facing the wall, the electrode terminal and the second connection area of ​​the current collector can share a portion of the space in the thickness direction of the wall, which is beneficial to improving the internal space utilization of the battery cell.

[0033] In some embodiments, along the thickness direction of the wall portion, the surface of the first connection region facing the wall portion is farther away from the wall portion than the surface of the second connection region facing away from the wall portion, and the surface of the second connection region facing away from the wall portion is connected to the tab.

[0034] In the above technical solution, by setting the surface of the first connection area facing the wall to be further away from the wall in the thickness direction of the wall than the surface of the second connection area away from the wall, the current collector has a "Z" shaped structure, and the tab is connected to the side of the second connection area away from the wall. This allows the electrode terminal and the tab to be located on both sides of the bending area, so that the electrode terminal and the tab can share part of the space in the thickness direction of the wall. This is beneficial to improving the internal space utilization of the battery cell and thus improving the energy density of the battery cell.

[0035] In some embodiments, along the thickness direction of the wall portion, the surface of the first connection area facing the wall portion is provided with a connection portion, and the connection portion is connected to the electrode terminal; wherein, the insulating member is provided with a through hole, the through hole penetrates the insulating member along the thickness direction of the wall portion, and the connection portion and / or the electrode terminal is inserted into the through hole.

[0036] In the above technical solution, by providing a connecting part protruding on the side of the first connection area facing the wall, and correspondingly providing through holes on the insulating member for inserting the connecting part and / or electrode terminals, the first connection area can be connected to the electrode terminals through the connecting part. The battery cell with this structure can improve the contact effect between the current collector and the electrode terminals, thereby improving the connection quality between the current collector and the electrode terminals.

[0037] In some embodiments, along the thickness direction of the wall portion, the first connecting area is away from the surface of the wall portion and a groove is formed at the position corresponding to the connecting portion.

[0038] In the above technical solution, by forming a groove on the surface of the first connection area away from the wall and corresponding to the position of the connection part, the connection part on the first connection area is a structure that can be formed by stamping process. The connection part and the groove are formed on the surfaces on both sides of the first connection area, thereby effectively reducing the forming difficulty of the current collector component and improving the production efficiency of the battery cell.

[0039] In some embodiments, along the thickness direction of the wall portion, the insulating member has a receiving groove on the side opposite to the wall portion, and the current collecting member is disposed in the receiving groove.

[0040] In the above technical solution, by providing a receiving groove for accommodating the current collector on the side of the insulating component away from the wall, the current collector can be accommodated in the receiving groove of the insulating component. The battery cell with this structure can, on the one hand, realize that the current collector and the insulating component share part of the space in the thickness direction of the wall, which is beneficial to improve the internal space utilization of the battery cell. On the other hand, it can realize the covering effect of the insulating component on the current collector, thereby improving the insulation isolation effect of the insulating component on the current collector and the wall, and also realizing the insulation isolation effect of the insulating component on the current collector and other components, which is beneficial to further reduce the risk of internal short circuits in the battery cell during use.

[0041] In some embodiments, the electrode assembly further includes a main body portion, the tab is connected to one end of the main body portion facing the wall portion in the thickness direction, and the insulating member is located between the wall portion and the main body portion; wherein, along the thickness direction of the wall portion, the insulating member abuts against the end of the main body portion where the tab is provided.

[0042] In the above technical solution, the tab is connected to the end of the main body of the electrode assembly facing the wall in the thickness direction of the wall, so that both the tab and the current collector are located at the end of the main body facing the wall, thereby reducing the connection difficulty between the tab and the current collector. In addition, by abutting the insulating member against the end of the main body where the tab is provided in the thickness direction of the wall, the insulating member and the electrode assembly can play a role in supporting and restricting each other within the housing, thereby reducing the risk of shaking or displacement of the insulating member and the electrode assembly during use.

[0043] In some embodiments, the housing includes a shell and an end cap; the interior of the shell is formed with a receiving cavity having a second opening, and the electrode assembly is received within the receiving cavity; the end cap closes the second opening; wherein the end cap is the wall portion.

[0044] In the above technical solution, by setting the wall of the outer shell as an end cap for closing the second opening of the shell, the battery cell with this structure is easy to assemble the electrode terminals on the end cap, which helps to reduce the assembly difficulty of the electrode terminals and reduces the connection difficulty between the current collector and the electrode terminals and between the current collector and the tab, thereby effectively reducing the assembly difficulty of the battery cell and improving the production efficiency of the battery cell.

[0045] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the thickness direction of the wall portion, and the other end forming a second opening, the sidewall and the bottom wall together defining a receiving cavity, the electrode assembly being received within the receiving cavity; the end cap closes the second opening; wherein, the bottom wall is the wall portion.

[0046] In the above technical solution, by setting the wall of the outer casing as a wall opposite to the end cover in the thickness direction of the wall, the battery cell with this structure can make the wall with the electrode terminals far away from the end cover, so that there is no direct connection between the wall and the end cover. This can alleviate the phenomenon that the force generated when the electrode terminals pull or twist the wall acts on the end cover, thereby reducing the risk of connection failure between the end cover and the casing, and thus helping to reduce the leakage risk of the battery cell during use.

[0047] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0048] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0051] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0052] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0053] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0054] Figure 5 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0055] Figure 6 for Figure 5A magnified view of part A of the shown battery cell;

[0056] Figure 7 This is a schematic diagram of the structure of the current collection component provided in some embodiments of this application;

[0057] Figure 8 A front view of a flow-collecting member in the thickness direction of the wall portion, provided for some embodiments of this application;

[0058] Figure 9 Schematic diagrams of the current collection components provided in some embodiments of this application;

[0059] Figure 10 A cross-sectional view of a current collection component provided for some embodiments of this application;

[0060] Figure 11 This is a schematic diagram of the structure of the insulating element provided in some embodiments of this application;

[0061] Figure 12 Partial cross-sectional view of a current collection component provided in some embodiments of this application;

[0062] Figure 13 Exploded views of the current collection components provided in some embodiments of this application.

[0063] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Housing; 211 - Wall; 212 - Housing; 2121 - Second opening; 213 - End cap; 22 - Electrode assembly; 221 - Main body; 222 - Tab; 23 - Electrode terminal; 24 - Current collector; 241 - First connection area; 2411 - Connection part; 2412 - Groove; 2413 - Printing groove; 242 - Second connection area; 243 - Insulating layer; 2431 - First opening; 2432 - Assembly cavity; 2433 - First insulating part; 244 - Bending area; 25 - Insulating component; 251 - Receiving groove; 252 - Through hole; 26 - Pressure relief component; 200 - Controller; 300 - Motor; X - Thickness direction of the wall; Y - First direction; Z - Second direction. Detailed Implementation

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In this application, "multiple" means two or more (including two).

[0071] 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.

[0072] 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.

[0073] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits to some extent while allowing active ions to pass through.

[0074] 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.

[0075] 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.

[0076] 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.).

[0077] 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 Mn1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0078] 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.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] 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.).

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0085] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] 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.

[0095] 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.

[0096] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0097] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly has a stacked structure.

[0099] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0100] 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.

[0101] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0117] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0118] For a typical battery cell, it includes a casing, electrode assembly, and electrode terminals mounted on the casing. To reduce assembly difficulty, a current collector is usually placed inside the casing. This current collector connects the electrode terminals and the tabs of the electrode assembly, simplifying assembly. Furthermore, to mitigate the risk of short circuits between the current collector and the casing, an insulating structure, such as a plastic insert, is typically placed between them to reduce the risk of internal short circuits. However, battery cells experience temperature increases during use, especially during thermal runaway. The high internal temperature can cause the insulating structure, such as the plastic insert, between the current collector and the casing to melt. Under the pressure of the electrode assembly, the area of ​​the current collector that connects to the tabs is prone to deformation relative to the area that connects to the electrode terminals. This deformation can lead to direct contact with the casing, significantly increasing the risk of internal short circuits within the battery cell. This can even result in fires or explosions, negatively impacting the reliability of the battery cell.

[0119] Based on the above considerations, in order to solve the problem of low reliability in the use of battery cells, this application provides a battery cell including a casing, an electrode assembly, electrode terminals, a current collector, and an insulating member. The casing has a wall. The electrode assembly is housed within the casing and has tabs. The electrode terminals are disposed on the wall. The current collector is disposed between the wall and the electrode assembly, and includes a first connection area and a second connection area connected to each other. The first connection area is connected to the electrode terminals, and the second connection area is connected to the tabs. The insulating member is disposed on the side of the wall facing the electrode assembly to insulate and isolate the wall and the second connection area. An insulating layer is disposed on the second connection area, covering at least a portion of the surface of the second connection area facing the insulating member in the thickness direction of the wall, and the melting point of the insulating layer material is greater than the melting point of the insulating member material.

[0120] In this type of battery cell, the current collector has a first connection area and a second connection area that are interconnected. The first connection area is connected to the electrode terminals, and the second connection area is connected to the tabs of the electrode assembly to achieve electrical connection between the electrode assembly and the electrode terminals. An insulating layer is provided on the second connection area of ​​the current collector. This insulating layer covers at least a portion of the surface of the second connection area facing the insulator in the thickness direction of the wall. The melting point of the insulating layer is greater than that of the insulator, making it more difficult for the insulating layer to melt. This ensures that even if the battery cell experiences thermal runaway or the insulator melts due to high temperature during use, the insulating layer can still provide a certain degree of insulation between the wall and the second connection area of ​​the current collector. This reduces the likelihood of the second connection area of ​​the current collector deforming under the pressure of the electrode assembly and directly contacting the wall after the insulator melts, thus reducing the risk of short circuits between the current collector and the wall. This effectively reduces the risk of internal short circuits or fires and explosions caused by short circuits during battery cell use, improving the reliability of the battery cell.

[0121] 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 composed of battery cells and battery devices disclosed in this application. This helps to mitigate the problem of internal short circuits or fires and explosions occurring in battery cells during use, thereby improving the reliability of the battery cells.

[0122] This application provides an electrical device that uses a single battery cell or battery assembly 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.

[0123] 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.

[0124] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 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.

[0125] 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.

[0126] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0127] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0128] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0129] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then 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 10.

[0130] 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 20 to achieve electrical connection between the multiple battery cells 20.

[0131] Each battery cell 20 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 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0132] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 This is a schematic diagram of the structure of the current collection component 24 provided in some embodiments of this application. Figure 8This is a front view of the current collector 24 provided in some embodiments of this application in the thickness direction X of the wall portion. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, electrode terminals 23, a current collector 24, and an insulator 25. The housing 21 has a wall portion 211. The electrode assembly 22 is housed within the housing 21 and has tabs 222. The electrode terminals 23 are disposed on the wall portion 211. The current collector 24 is disposed between the wall portion 211 and the electrode assembly 22, and includes a first connection region 241 and a second connection region 242 interconnected. The first connection region 241 connects to the electrode terminals 23, and the second connection region 242 connects to the tabs 222. The insulator 25 is disposed on the side of the wall portion 211 facing the electrode assembly 22 to insulate and isolate the wall portion 211 and the second connection region 242. An insulating layer 243 is provided on the second connection area 242. The insulating layer 243 covers at least a portion of the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion, and the melting point of the material of the insulating layer 243 is greater than the melting point of the material of the insulating member 25.

[0133] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0134] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, it can protect the electrode assembly 22 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 22, and a sealing bag may be included between the housing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0135] Optionally, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has a second opening 2121. That is, the housing 212 is a hollow structure with a second opening 2121 at one end. The end cap 213 covers the second opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0136] It should be noted that the wall portion 211 for mounting the electrode terminal 23 can be the end cap 213 of the housing 21, or it can be a wall of the housing 212 of the housing 21. For example, in... Figure 3 and Figure 4In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0137] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the housing 212 can be filled with electrolyte. Then, the end cap 213 can be closed onto the second opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0138] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 and Figure 4 In the middle, the shell 212 has a cuboid structure.

[0139] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with a second opening 2121 formed on both opposite sides. One end cap 213 is fitted onto one of the second openings 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has a second opening 2121 formed on both opposite sides, and the two end caps 213 are fitted onto both sides of the housing 212 to close the corresponding second opening 2121.

[0140] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode, the separator and the negative electrode, or a stacked structure formed by arranging the positive electrode, the separator and the negative electrode in layers.

[0141] 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.

[0142] The electrode assembly 22 includes a main body 221 and tabs 222. The main body 221 is the main component of the electrode assembly 22 that undergoes electrochemical reactions within the battery cell 20. For example, in... Figure 4 and Figure 5 In the middle, the electrode tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall portion, that is, in the thickness direction X of the wall portion, the electrode tab 222 is located between the main body 221 and the wall portion 211, so that the electrode tab 222 can be connected to the electrode terminal 23 through the current collector 24.

[0143] It should be noted that the tabs 222 of the electrode assembly 22 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 222 are used for the positive electrode of the output electrode assembly 22, then the tabs 222 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 222 are used for the negative electrode of the output electrode assembly 22, then the tabs 222 are formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0144] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 4 In the battery cell 20, the outer casing 21 is provided with multiple electrode assemblies 22. The multiple electrode assemblies 22 are stacked along the second direction Z. When multiple electrode assemblies 22 are provided in the outer casing 21 of the battery cell 20, the number of electrode assemblies 22 can be two, three, four, five or six, etc.

[0145] Among them, the first direction Y, the second direction Z and the thickness direction X of the wall are perpendicular to each other. The thickness direction X of the wall is also the height direction of the battery cell 20, the first direction Y is also the length direction of the battery cell 20, and the second direction Z is also the thickness direction of the battery cell 20.

[0146] The electrode terminal 23 serves to electrically connect to the electrode assembly 22, acting as the output or input terminal of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0147] For example, the electrode terminal 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0148] In this embodiment, the electrode terminal 23 is insulated and mounted on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 23 and the wall portion 211 of the housing 21.

[0149] Among them, Figure 3 and Figure 4In the battery cell 20, there are two electrode terminals 23. Correspondingly, each electrode assembly 22 has two tabs 222. The two tabs 222 are connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. The two tabs 222 have opposite polarities and are spaced apart along the first direction Y. That is, the two tabs 222 are the positive and negative terminals of the input or output electrode assembly 22, respectively. The two electrode terminals 23 are electrically connected to the two tabs 222 of the electrode assembly 22, respectively, so as to realize the input or output of the positive and negative terminals of the battery cell 20.

[0150] The structure in which the electrode terminal 23 is mounted on the housing 21 can be varied. For example, in... Figure 3 and Figure 4 In this embodiment, two electrode terminals 23 are spaced apart along the first direction Y on the wall portion 211 of the outer casing 21, that is, two electrode terminals 23 are spaced apart along the first direction Y on the end cap 213 of the outer casing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the two electrode terminals 23 can also be both mounted on the housing 212 of the outer casing 21. Similarly, the two electrode terminals 23 can also be one electrode terminal 23 mounted on the housing 212 of the outer casing 21 and the other electrode terminal 23 mounted on the end cap 213 of the outer casing 21.

[0151] In this embodiment, the current collector 24 is disposed between the wall portion 211 and the main body portion 221 of the electrode assembly 22 in the thickness direction X of the wall portion. That is, the wall portion 211, the current collector 24 and the main body portion 221 are arranged sequentially along the thickness direction X of the wall portion to facilitate the connection between the tab 222 of the electrode assembly 22 and the electrode terminal 23 disposed on the wall portion 211. The current collector 24 serves to connect the electrode terminal 23 and the tab 222 of the electrode assembly 22 to realize the electrical connection between the electrode terminal 23 and the electrode assembly 22, thereby reducing the connection difficulty between the electrode terminal 23 and the tab 222 of the electrode assembly 22.

[0152] For example, the material of the current collector 24 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0153] exist Figure 4 In the battery cell 20, there may be two current collectors 24. Both current collectors 24 are disposed inside the housing 21 and are arranged at intervals along the first direction Y. Each current collector 24 is connected to an electrode terminal 23 and a tab 222 of the same polarity in a plurality of electrode assemblies 22, so as to output or input the positive and negative electrodes of the electrode assembly 22 respectively.

[0154] The current collection component 24 includes a first connection area 241 and a second connection area 242 that are connected to each other, and the second connection area 242 and the first connection area 241 are arranged along the first direction Y. That is, the current collection component 24 includes at least two parts, the first connection area 241 and the second connection area 242, and the first connection area 241 and the second connection area 242 are arranged and connected along the first direction Y.

[0155] It should be noted that the first connection area 241 and the second connection area 242 can be directly connected or indirectly connected. For example, in Figure 7 and Figure 8 In this configuration, the second connection region 242 of the current collector 24 is directly connected to the first connection region 241, meaning that one end of the second connection region 242 in the first direction Y is directly connected to one end of the first connection region 241 in the first direction Y. Of course, in other embodiments, the first connection region 241 and the second connection region 242 can also be indirectly connected, as detailed below. Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of the current collection component 24 provided in some embodiments of this application. Figure 10 The following is a cross-sectional view of a current-collecting member 24 provided in some embodiments of this application. The current-collecting member 24 may further include a bending region 244, which is located between a first connecting region 241 and a second connecting region 242 in a first direction Y, and the first connecting region 241 and the second connecting region 242 are connected by the bending region 244.

[0156] Optionally, the second connection area 242 of the current collection component 24 can be one or more, for example, in Figure 9 In the middle, the current collection component 24 includes only one second connection area 242, for example, in Figure 7 and Figure 8 In the current collecting component 24, there are two second connecting regions 242, which are arranged at intervals along the second direction Z. Both second connecting regions 242 are connected to the same end of the first connecting region 241 in the first direction Y. Of course, in other embodiments, the current collecting component 24 may also include three, four, or five second connecting regions 242. Similarly, the first connecting region 241 and the second connecting region 242 of the current collecting component 24 can be an integrally formed structure or a separate structure. For example, in... Figure 7 and Figure 9In the process, the first connecting area 241 and the second connecting area 242 are integrally formed structures. The first connecting area 241 and the second connecting area 242 can be made by integral forming processes such as stamping, casting or milling. Of course, in the structure where the first connecting area 241 and the second connecting area 242 are separate, the connection structure between the first connecting area 241 and the second connecting area 242 can also be of various types, such as welding connection or snap-fit ​​connection.

[0157] The first connection area 241 is connected to the electrode terminal 23, and the second connection area 242 is connected to the tab 222. That is, the first connection area 241 of the current collector 24 is the part of the current collector 24 used to connect with the electrode terminal 23, while the second connection area 242 of the current collector 24 is the part of the current collector 24 used to connect with the tab 222.

[0158] Optionally, the connection structure between the first connection area 241 and the electrode terminal 23 and between the second connection area 242 and the tab 222 can be various, such as welding connection or abutment connection.

[0159] At least a portion of the insulating member 25 is disposed between the second connection area 242 and the wall portion 211 of the current collecting member 24 in the thickness direction X of the wall portion, such that the second connection area 242 and the wall portion 211 are spaced apart along the thickness direction X of the wall portion, and the insulating member 25 is able to insulate and isolate the second connection area 242 and the wall portion 211.

[0160] For example, the insulating element 25 may be made of polypropylene, polyoxymethylene, or rubber, etc.

[0161] An insulating layer 243 is provided on the second connection area 242. The insulating layer 243 covers at least a portion of the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion. That is, at least a portion of the insulating layer 243 is provided on the surface of the second connection area 242 of the current collector 24 facing the insulating member 25, so that the insulating layer 243 can cover at least a portion of the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion. Optionally, the insulating layer 243 may be entirely provided on the surface of the second connection area 242 facing the insulating member 25, or only a portion of the insulating layer 243 may be provided on the surface of the second connection area 242 facing the insulating member 25.

[0162] The melting point of the insulating layer 243 is greater than that of the insulating component 25. In other words, the insulating layer 243 is more heat-resistant and harder to melt than the insulating component 25. When the internal temperature of the battery cell 20 rises, the insulating component 25 will soften or melt before the insulating layer 243.

[0163] It should be noted that the melting point of the insulating layer 243 is the temperature at which the insulating layer 243 changes from a hard solid to a liquid state or is softened and melted into a molten viscous flow state. Similarly, the melting point of the insulating component 25 is the temperature at which the insulating component 25 changes from a hard solid to a liquid state or is softened and melted into a molten viscous flow state.

[0164] In this embodiment, the insulating member 25 is disposed inside the housing 21, and at least a portion of the insulating member 25 is disposed between the wall portion 211 and the current collecting member 24 in the thickness direction X of the wall portion, so as to insulate and isolate the wall portion 211 and the current collecting member 24, so that the insulating member 25 can perform the function of insulating and isolating the wall portion 211 and the current collecting member 24.

[0165] Among them, reference Figure 4 , Figure 5 and Figure 6 Please refer to further details. Figure 11 , Figure 11 The diagram below shows the structure of the insulating member 25 provided in some embodiments of this application. In the thickness direction X of the wall, the side of the insulating member 25 facing away from the wall 211 abuts against the end of the main body 221 of the electrode assembly 22 where the tab 222 is provided. The side of the insulating member 25 facing away from the wall 211 is provided with a receiving groove 251. The receiving groove 251 is provided one-to-one with the current collector 24. The current collector 24 is accommodated in the receiving groove 251, and at least a portion of the tab 222 is accommodated in the receiving groove 251. This allows the tab 222, the current collector 24, and the insulating member 25 to share a portion of the space in the thickness direction X of the wall, thereby improving the internal space utilization of the battery cell 20 and improving the insulation and isolation effect of the insulating member 25 on the current collector 24 and the wall 211. In addition, the insulating member 25 can also effectively insulate and isolate the two current collectors 24 disposed in the housing 21 to reduce the risk of overlap between the two current collectors 24.

[0166] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may further include a pressure relief component 26, which is disposed on the end cap 213. The pressure relief component 26 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a predetermined value. Of course, in other embodiments, the pressure relief component 26 may also be disposed on the housing 212.

[0167] Optionally, the pressure relief component 26 and the end cap 213 can be an integrally formed structure or a separate structure. For example, in... Figure 4In this embodiment, the pressure relief component 26 and the end cap 213 are separate structures. The pressure relief component 26 can be connected to the end cap 213 by welding or other means. Correspondingly, the pressure relief component 26 can be a pressure relief component 26 such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. Of course, in other embodiments, the pressure relief component 26 and the end cap 213 can also be an integrally formed structure. In this case, the pressure relief component 26 is a region on the end cap 213 with a weak structure, such as a region on the end cap 213 with a groove.

[0168] In this embodiment, the current collector 24 has a first connection area 241 and a second connection area 242 that are interconnected. The first connection area 241 is connected to the electrode terminal 23, and the second connection area 242 is connected to the tab 222 of the electrode assembly 22 to achieve an electrical connection between the electrode assembly 22 and the electrode terminal 23. An insulating layer 243 is provided on the second connection area 242 of the current collector 24. The insulating layer 243 covers at least a portion of the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion. The melting point of the insulating layer 243 is greater than that of the insulating member 25, making the insulating layer 243 more difficult to melt than the insulating member 25. This ensures that even if the battery cell 20 experiences thermal runaway or the insulating component 25 melts due to high temperature during use, the insulating layer 243 can still provide a certain degree of insulation between the wall portion 211 and the second connection area 242 of the current collector 24. This reduces the phenomenon of the second connection area 242 of the current collector 24 deforming under the pressure of the electrode assembly 22 and directly overlapping with the wall portion 211, thereby reducing the risk of short circuit between the current collector 24 and the wall portion 211. This effectively reduces the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell 20 during use, and helps to improve the reliability of the battery cell 20.

[0169] According to some embodiments of this application, refer to Figure 6 , Figure 7 and Figure 8 And further refer to Figure 12 , Figure 12 This is a partial cross-sectional view of a current-collecting member 24 provided in some embodiments of this application. A first connection region 241 and a second connection region 242 are arranged along a first direction Y. An insulating layer 243 covers at least a portion of the end face of the second connection region 242 away from the first connection region 241 in the first direction Y, which is perpendicular to the thickness direction X of the wall.

[0170] The insulating layer 243 covers at least a portion of the end face of the second connection region 242 away from the first connection region 241 in the first direction Y. That is, a portion of the insulating layer 243 is disposed on the end face of the second connection region 242 away from the first connection region 241 in the first direction Y.

[0171] For example, the insulating layer 243 covers the entire end face of the second connection region 242 in the first direction Y, at the end of the second connection region 242 that is away from the first connection region 241 in the first direction Y.

[0172] In this embodiment, by setting the insulating layer 243 to cover at least a portion of the end face of the second connection area 242 away from the first connection area 241 in the first direction Y, the insulating layer 243 is also provided on the end face of the second connection area 242 away from the first connection area 241 in the first direction Y. This reduces the phenomenon of direct overlap between the end face of the second connection area 242 of the current collector 24 away from the first connection area 241 in the first direction Y and the wall portion 211 after the insulating member 25 is melted at high temperature. This is beneficial to improving the insulating effect of the insulating layer 243 in insulating and isolating the second connection area 242 and the wall portion 211, thereby further reducing the risk of short circuit between the current collector 24 and the wall portion 211.

[0173] In some embodiments, see Figure 7 , Figure 8 and Figure 12 As shown, the insulating layer 243 covers at least a portion of the second connection region 242 on the surface of the wall portion facing away from the insulating member 25 in the thickness direction X. That is, a portion of the insulating layer 243 is disposed on the surface of the second connection region 242 on the surface of the wall portion facing away from the insulating member 25 in the thickness direction X.

[0174] In this embodiment, by setting the insulating layer 243 to cover at least a portion of the surface of the second connection area 242 facing away from the insulating member 25 in the thickness direction X of the wall, the insulating layer 243 is provided on both sides of the second connection area 242 in the thickness direction X of the wall. This further reduces the phenomenon of direct overlap between the second connection area 242 of the current collector 24 and the wall 211 after the insulating member 25 is melted at high temperature, thereby further reducing the risk of short circuit between the current collector 24 and the wall 211.

[0175] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 12 As shown, the first connection area 241 and the second connection area 242 are arranged along the first direction Y, and the insulating layer 243 covers at least a portion of the surface of at least one side of the second connection area 242 in the second direction Z. The first direction Y, the second direction Z and the thickness direction X of the wall are perpendicular to each other.

[0176] The insulating layer 243 covers at least a portion of the surface of the second connection region 242 on at least one side in the second direction Z, that is, the insulating layer 243 is provided on the surface of the second connection region 242 on at least one side in the second direction Z.

[0177] In this embodiment, by setting the insulating layer 243 to cover at least a portion of the surface of at least one side of the second connection area 242 in the second direction Z, the insulating layer 243 is also provided on the surface of at least one side of the second connection area 242 in the second direction Z. This reduces the phenomenon of direct overlap between the surface of the second connection area 242 of the current collector 24 in the second direction Z and the wall portion 211 after the insulating member 25 is melted at high temperature. This is beneficial to improving the insulating effect of the insulating layer 243 in insulating and isolating the second connection area 242 and the wall portion 211, thereby further reducing the risk of short circuit between the current collector 24 and the wall portion 211.

[0178] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 12 As shown, the insulating layer 243 covers at least a portion of the surfaces of the second connection region 242 on both sides in the second direction Z. That is, the insulating layer 243 is provided on both sides of the second connection region 242 in the second direction Z.

[0179] In this embodiment, by setting the insulating layer 243 to cover at least a portion of the surfaces of the second connection area 242 on both sides in the second direction Z, the insulating layer 243 is provided on both sides of the second connection area 242 in the second direction Z. This further reduces the phenomenon of direct overlap between the surfaces of the second connection area 242 on both sides in the second direction Z and the wall portion 211 after the insulating member 25 is melted at high temperature. This is beneficial to further improve the insulating effect of the insulating layer 243 in isolating the second connection area 242 and the wall portion 211, thereby further reducing the risk of short circuit between the current collector 24 and the wall portion 211.

[0180] According to some embodiments of this application, refer to Figure 6 , Figure 7 , Figure 8 and Figure 12 And further refer to Figure 13 , Figure 13 This is an exploded view of the current collecting member 24 provided in some embodiments of this application. A first connecting region 241 and a second connecting region 242 are arranged along a first direction Y. An insulating layer 243 surrounds and forms an assembly cavity 2432 with a first opening 2431, which is located on one side of the insulating layer 243 in the first direction Y. Along the first direction Y, one end of the second connecting region 242 away from the first connecting region 241 is inserted into the assembly cavity 2432.

[0181] The insulating layer 243 encloses and forms an assembly cavity 2432 with a first opening 2431. The first opening 2431 is located on one side of the insulating layer 243 in the first direction Y. That is, the insulating layer 243 has a hollow structure with the first opening 2431 at one end in the first direction Y, so as to form the assembly cavity 2432 inside the insulating layer 243, and the assembly cavity 2432 is connected to the first opening 2431.

[0182] Along the first direction Y, the end of the second connecting region 242 away from the first connecting region 241 is inserted into the assembly cavity 2432. That is, the free end of the second connecting region 242 that is not connected to the first connecting region 241 in the first direction Y is inserted into the assembly cavity 2432 of the insulating layer 243 from the first opening 2431 along the first direction Y, so that the insulating layer 243 covers the outer surface of the end of the second connecting region 242 away from the first connecting region 241.

[0183] In this embodiment, the insulating layer 243 encloses and forms an assembly cavity 2432, and a first opening 2431 communicating with the assembly cavity 2432 is formed on one side of the insulating layer 243 in the first direction Y. By inserting the end of the second connection region 242 away from the first connection region 241 in the first direction Y into the assembly cavity 2432 through the first opening 2431, the five outer surfaces of the end of the second connection region 242 away from the first connection region 241 in the first direction Y are all covered with the insulating layer 243. The battery cell 20 with this structure can reduce the difficulty of setting the insulating layer 243 on the second connection region 242 and improve the stability and reliability of the insulating layer 243 on the second connection region 242. On the other hand, it can also improve the stability and reliability of the second connection region. After the electrode assembly 22 deforms under pressure, the insulating layer 243 is applied to the position where it is most likely to overlap with the wall 211. This allows the insulating layer 243 to provide better insulation and isolation between the second connection area 242 and the wall 211 after the insulating component 25 melts due to high temperature during use or the battery cell 20 experiences thermal runaway. This further reduces the phenomenon of direct overlap between the second connection area 242 of the current collector 24 and the wall 211 after the insulating component 25 melts due to high temperature, thereby further reducing the risk of short circuit between the current collector 24 and the wall 211. This further reduces the risk of internal short circuit or fire and explosion caused by short circuit during use, which is beneficial to further improving the reliability of the battery cell 20.

[0184] According to some embodiments of this application, see Figure 12 As shown, along the thickness direction X of the wall portion, the insulating layer 243 has a first insulating portion 2433 located on the surface of the second connection area 242 facing the insulating member 25. The thickness of the first insulating portion 2433 is D, which satisfies 0.2mm≤D≤2mm.

[0185] Wherein, the first insulating portion 2433 is the portion of the insulating layer 243 located on the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion, and correspondingly, D is the thickness of the portion of the insulating layer 243 located on the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall portion.

[0186] For example, the thickness D of the first insulating portion 2433 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm or 2mm, etc.

[0187] In this embodiment, by setting the thickness of the first insulating portion 2433 on the surface of the second connection area 242 facing the insulating layer 243 to 0.2mm to 2mm, on the one hand, setting the thickness of the first insulating portion 2433 to be greater than or equal to 0.2mm increases the creepage distance between the second connection area 242 and the wall portion 211, which is beneficial to improving the insulating effect of the insulating layer 243 on isolating the wall portion 211 and the second connection area 242. On the other hand, setting the thickness of the first insulating portion 2433 to be less than or equal to 2mm alleviates the phenomenon of excessive space occupied by the insulating layer 243, thereby improving the internal space utilization rate of the battery cell 20, increasing the energy density of the battery cell 20, and reducing the phenomenon of excessive material waste, thereby reducing the manufacturing cost of the battery cell 20.

[0188] According to some embodiments of this application, the melting point of the insulating layer 243 is greater than or equal to 250°C.

[0189] The insulating layer 243 has a melting point greater than or equal to 250°C. In other words, the insulating layer 243 will only change from a hard solid to a liquid state or be softened and melted into a molten viscous flow state after the temperature reaches 250°C or above.

[0190] For example, the insulating layer 243 can be made of various materials, such as polytetrafluoroethylene-fluorinated propylene copolymer or polyimide.

[0191] In this embodiment, by setting the melting point of the insulating layer 243 to be greater than or equal to 250°C, the insulating layer 243 has better high-temperature resistance, which helps to reduce the phenomenon of the insulating layer 243 melting during the thermal runaway or use of the battery cell 20. Thus, even after the insulating component 25 melts due to thermal runaway of the battery cell 20, the insulating layer 243 can still provide good insulation and isolation for the second connection area 242 and the wall portion 211, further reducing the phenomenon of direct contact between the second connection area 242 and the wall portion 211 of the current collector 24. This further reduces the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell 20 during thermal runaway, which helps to further improve the reliability of the battery cell 20.

[0192] According to some embodiments of this application, the resistivity of the insulating layer 243 is greater than or equal to 100MΩ.

[0193] In this embodiment, by setting the resistance of the insulating layer 243 material to be greater than or equal to 100MΩ, the insulating layer 243 has better insulation performance, which is beneficial to further improve the effect of the insulating isolation wall portion 211 of the insulating layer 243 and the second connection area 242 of the current collecting member 24.

[0194] According to some embodiments of this application, see Figure 6 As shown, a gap is formed between the second connecting region 242 and the insulating member 25 along the thickness direction X of the wall. That is, the second connecting region 242 and the insulating member 25 of the current collecting member 24 are spaced apart in the thickness direction X of the wall, so that the second connecting region 242 and the insulating member 25 of the current collecting member 24 are not in direct contact in the thickness direction X of the wall.

[0195] In this embodiment, by forming a gap between the second connection area 242 and the insulating member 25, the second connection area 242 and the insulating member 25 are arranged at intervals along the thickness direction X of the wall. This facilitates the provision of an insulating layer 243 on the surface of the second connection area 242 facing the insulating member 25, which helps to reduce interference between the insulating layer 243 and the insulating member 25, thereby reducing the assembly difficulty of the battery cell 20.

[0196] In some embodiments, combined with Figure 6 and Figure 12 As shown, along the thickness direction X of the wall portion, the size of the gap between the second connection area 242 and the insulating member 25 is L. The insulating layer 243 has a first insulating portion 2433 located on the surface of the second connection area 242 facing the insulating member 25. The thickness of the first insulating portion 2433 is D, satisfying L≥D.

[0197] Where L is the distance between the second connection area 242 and the insulating member 25 in the thickness direction X of the wall.

[0198] L≥D, meaning the distance between the second connection area 242 and the insulating member 25 in the thickness direction X of the wall is greater than or equal to the thickness of the portion of the insulating layer 243 on the surface of the second connection area 242 facing the insulating member 25 in the thickness direction X of the wall.

[0199] In this embodiment, by setting the dimension L of the gap between the second connection area 242 and the insulating member 25 in the thickness direction X of the wall portion to be greater than or equal to the thickness D of the first insulating portion 2433 on the surface of the insulating layer 243 on the side of the second connection area 242 facing the insulating member 25, the difficulty of setting the insulating layer 243 on the surface of the second connection area 242 facing the insulating member 25 can be further reduced, which is beneficial to further reduce the interference phenomenon between the insulating layer 243 and the insulating member 25, so as to further reduce the assembly difficulty of the battery cell 20.

[0200] In some embodiments, see Figure 6 As shown, along the thickness direction X of the wall, the size of the gap between the second connection area 242 and the insulating member 25 is L, which satisfies 0.1mm≤L≤2mm.

[0201] Wherein, 0.1mm≤L≤2mm, that is, the distance between the second connection area 242 and the insulating member 25 in the thickness direction X of the wall is 0.1mm to 2mm.

[0202] For example, the size L of the gap between the second connection area 242 and the insulating member 25 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm or 2mm, etc.

[0203] In this embodiment, by setting the gap between the second connection area 242 and the insulating member 25 in the thickness direction X of the wall to be 0.1mm to 2mm, on the one hand, it can alleviate the phenomenon that the assembly difficulty between the first connection area 241 of the current collector 24 and the electrode terminal 23 is too large due to the gap size, and it can also alleviate the phenomenon that the difficulty of setting the insulating layer 243 on the side of the second connection area 242 of the current collector 24 facing the insulating member 25 is too large, thereby reducing the assembly difficulty of the battery cell 20. On the other hand, it can alleviate the phenomenon that the space is wasted due to the gap size, which is conducive to improving the internal space utilization of the battery cell 20 and thus improving the energy density of the battery cell 20.

[0204] According to some embodiments of this application, see Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the first connection region 241 and the second connection region 242 are arranged along the first direction Y. The battery cell 20 includes multiple electrode assemblies 22, which are stacked along the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the wall are perpendicular to each other. The current collector 24 includes multiple second connection regions 242, each of which is connected to one end of the first connection region 241 in the first direction Y. The multiple second connection regions 242 are spaced apart along the second direction Z, and each second connection region 242 is connected to the tab 222 of at least one electrode assembly 22.

[0205] Among them, the tabs 222 of the multiple electrode assemblies 22 are all disposed at the end of the corresponding main body 221 facing the wall 211 in the thickness direction X of the wall.

[0206] Multiple second connection areas 242 are all connected to one end of the first connection area 241 in the first direction Y, and the multiple second connection areas 242 are spaced apart along the second direction Z. That is, the multiple second connection areas 242 are located on one side of the first connection area 241 in the first direction Y and are all connected to the first connection area 241, and the multiple second connection areas 242 are spaced apart along the second direction Z.

[0207] Each second connection region 242 is connected to the tab 222 of at least one electrode assembly 22, that is, each second connection region 242 is correspondingly connected to at least one tab 222 of the electrode assembly 22.

[0208] For example, in Figure 4 and Figure 7 In the battery cell 20, there are four electrode assemblies 22, which are stacked along the second direction Z. Correspondingly, the current collector 24 includes two second connection areas 242, which are spaced apart along the second direction Z. Each second connection area 242 is connected to a tab 222 of the same polarity in the two electrode assemblies 22, so that the four electrode assemblies 22 are electrically connected to the electrode terminal 23 through a current collector 24.

[0209] In this embodiment, the current collector 24 is provided with a plurality of second connection areas 242, each of which is connected to one side of the first connection area 241 in the first direction Y. The plurality of second connection areas 242 are spaced apart along the second direction Z, such that each second connection area 242 can be connected to the tab 222 of at least one electrode assembly 22. This enables multiple electrode assemblies 22 stacked along the second direction Z to be connected to an electrode terminal 23 after being combined by a current collector 24. This allows for the realization of a battery cell 20 with a large capacity while reducing the assembly difficulty and manufacturing cost of the battery cell 20.

[0210] According to some embodiments of this application, see Figure 9 and Figure 10 As shown, the current collector 24 may further include a bending region 244, which connects the first connecting region 241 and the second connecting region 242. Along the thickness direction X of the wall, the surface of the first connecting region 241 facing the wall 211 is further away from the wall 211 than the surface of the second connecting region 242 facing the wall 211, and the surface of the first connecting region 241 facing the wall 211 is connected to the electrode terminal 23.

[0211] Wherein, the bending region 244 is a bending structure connecting the first connecting region 241 and the second connecting region 242 in the first direction Y. For example, in Figure 10 In the process, the first connecting area 241, the second connecting area 242, and the bending area 244 are integrally formed structures, which can be manufactured by integral forming processes such as stamping or casting.

[0212] Along the thickness direction X of the wall, the surface of the first connecting area 241 facing the wall 211 is farther away from the wall 211 than the surface of the second connecting area 242 facing the wall 211. In other words, in the thickness direction X of the wall, the distance between the wall 211 and the first connecting area 241 is greater than the distance between the wall 211 and the second connecting area 242.

[0213] It should be noted that in some embodiments, the second connection area 242 may also be a structure directly connected to the first connection area 241, for example, in Figure 7 and Figure 8 In the first direction Y, one end of the second connection region 242 is directly connected to the first connection region 241.

[0214] In this embodiment, the current collector 24 is further provided with a bending area 244, and the first connection area 241 and the second connection area 242 are connected by the bending area 244. This allows the surface of the first connection area 241 facing the wall 211 to be further away from the wall 211 in the thickness direction X of the wall than the surface of the second connection area 242 facing the wall 211. After the electrode terminal 23 is connected to the surface of the first connection area 241 facing the wall 211, the electrode terminal 23 and the second connection area 242 of the current collector 24 can share a portion of the space in the thickness direction X of the wall, which is beneficial to improving the internal space utilization of the battery cell 20.

[0215] In some embodiments, see Figure 10 As shown, along the thickness direction X of the wall portion, the surface of the first connecting region 241 facing the wall portion 211 is farther away from the wall portion 211 than the surface of the second connecting region 242 facing away from the wall portion 211, and the surface of the second connecting region 242 facing away from the wall portion 211 is connected to the tab 222.

[0216] The surface of the first connection area 241 facing the wall 211 is farther away from the wall 211 than the surface of the second connection area 242 facing away from the wall 211. In other words, the second connection area 242 is generally closer to the wall 211 than the first connection area 241 in the thickness direction X of the wall, so that the first connection area 241 can be connected to the electrode terminal 23. After the second connection area 242 and the tab 222 are connected, the electrode terminal 23 and the tab 222 are located on both sides of the bending area 244 in the first direction Y, and the electrode terminal 23 and the tab 222 can share a portion of the space in the thickness direction X of the wall.

[0217] In this embodiment, by setting the surface of the first connection area 241 facing the wall portion 211 to be further away from the wall portion 211 in the thickness direction X of the wall portion than the surface of the second connection area 242 away from the wall portion 211, the current collector 24 is arranged in a "Z" shape, and the tab 222 is connected to the side of the second connection area 242 away from the wall portion 211. This allows the electrode terminal 23 and the tab 222 to be located on both sides of the bending area 244, so that the electrode terminal 23 and the tab 222 can share a portion of the space in the thickness direction X of the wall portion. This is beneficial to improving the internal space utilization of the battery cell 20 and thus improving the energy density of the battery cell 20.

[0218] According to some embodiments of this application, see Figure 6 , Figure 7 , Figure 8 and Figure 11As shown, along the thickness direction X of the wall portion, a connecting portion 2411 is provided on the surface of the first connecting area 241 facing the wall portion 211, and the connecting portion 2411 is connected to the electrode terminal 23. The insulating member 25 is provided with a through hole 252, which penetrates the insulating member 25 along the thickness direction X of the wall portion, and the connecting portion 2411 and / or the electrode terminal 23 are inserted into the through hole 252.

[0219] The connecting portion 2411 is a protruding structure on the surface of the first connecting area 241 facing the wall portion 211, and the connecting portion 2411 is connected to the electrode terminal 23, so that the first connecting area 241 is a structure in which the connecting portion 2411 and the electrode terminal 23 are connected to each other.

[0220] The through hole 252 on the insulating member 25 is a structure provided for the electrode terminal 23 and the connecting part 2411. The projection of the connecting part 2411 in the thickness direction X of the wall is located in the through hole 252 so that the connecting part 2411 can be inserted into the through hole 252.

[0221] The connecting part 2411 and / or the electrode terminal 23 are inserted into the through hole 252. That is, it can be a structure in which only the connecting part 2411 is inserted into the through hole 252 along the thickness direction X of the wall, or it can be a structure in which only the electrode terminal 23 is inserted into the through hole 252 along the thickness direction X of the wall, or it can be a structure in which both the connecting part 2411 and the electrode terminal 23 are inserted into the through hole 252 along the thickness direction X of the wall.

[0222] For example, in Figure 6 In the first connection area 241, a connecting portion 2411 protruding from the first connection area 241 is inserted into the through hole 252 along the thickness direction X of the wall portion, and the connecting portion 2411 extends out of the side of the insulating member 25 facing the wall portion 211, so as to facilitate the assembly and connection of the connecting portion 2411 and the electrode terminal 23. Of course, in other embodiments, the first connection area 241 of the current collector 24 may not have a connecting portion 2411, for example, see Figure 9 and Figure 10 As shown, no connecting portion 2411 is provided on the first connecting area 241, and the surface of the first connecting area 241 facing the wall portion 211 in the thickness direction X of the wall portion is directly connected to the electrode terminal 23.

[0223] It should be noted that in the embodiment where a receiving groove 251 is provided on the side of the insulating member 25 away from the wall portion 211 and the current collecting member 24 is accommodated in the receiving groove 251, the through hole 252 is a structure provided on the bottom surface of the receiving groove 251 and penetrating the bottom wall of the receiving groove 251 along the thickness direction X of the wall portion.

[0224] In this embodiment, a connecting portion 2411 protrudes from the side of the first connecting area 241 facing the wall portion 211, and a through hole 252 is provided on the insulating member 25 for the connecting portion 2411 and / or the electrode terminal 23 to be inserted, so that the first connecting area 241 can be connected to the electrode terminal 23 through the connecting portion 2411. The battery cell 20 with this structure can improve the contact effect between the current collector 24 and the electrode terminal 23, thereby improving the connection quality between the current collector 24 and the electrode terminal 23.

[0225] In some embodiments, see Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the first connecting area 241 is away from the surface of the wall portion 211 and a groove 2412 is formed at the position corresponding to the connecting portion 2411.

[0226] For example, the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 is a structure formed by a stamping process, so that the connecting portion 2411 is formed on the surface of the first connecting area 241 facing the wall portion 211, and a groove 2412 is formed on the surface of the first connecting area 241 away from the wall portion 211. Of course, the processing method of the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 is not limited to this. In other embodiments, the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 can also be formed by a processing process such as casting or milling.

[0227] For example, in this embodiment, the connecting portion 2411 is welded to the electrode terminal 23. Correspondingly, a plurality of printing grooves 2413 are also provided on the bottom surface of the groove 2412 to improve the welding quality between the connecting portion 2411 and the electrode terminal 23. Of course, in embodiments where the first connecting area 241 does not have a connecting portion 2411, for example, in Figure 9 In the middle, the surface of the first connection area 241 facing the wall 211 in the thickness direction X of the wall is directly welded to the electrode terminal 23. Correspondingly, a plurality of printing grooves 2413 are provided on the surface of the first connection area 241 facing away from the wall 211 in the thickness direction X of the wall.

[0228] In this embodiment, by forming a groove 2412 on the surface of the first connection area 241 away from the wall portion 211 and corresponding to the position of the connection portion 2411, the connection portion 2411 on the first connection area 241 is a structure that can be formed by stamping. Thus, the connection portion 2411 and the groove 2412 are formed on the surfaces on both sides of the first connection area 241, thereby effectively reducing the forming difficulty of the current collector 24 and improving the production efficiency of the battery cell 20.

[0229] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 11 As shown, along the thickness direction X of the wall portion, the insulating member 25 is provided with a receiving groove 251 on the side opposite to the wall portion 211, and the current collecting member 24 is disposed in the receiving groove 251.

[0230] In this case, along the thickness direction X of the wall portion, the current collecting member 24 is entirely housed within the receiving groove 251, meaning that the current collecting member 24 does not extend beyond the side of the insulating member 25 away from the wall portion 211 in the thickness direction X of the wall portion.

[0231] For example, in this embodiment, the battery cell 20 includes two current collectors 24, which are spaced apart along the first direction Y within the housing 21. Correspondingly, the insulating member 25 has two receiving grooves 251 on the side facing away from the wall 211, which are also spaced apart along the first direction Y. Each receiving groove 251 is used to accommodate one current collector 24, thereby achieving insulation isolation between the two current collectors 24 through the insulating member 25. Of course, in other embodiments, the side of the insulating member 25 facing away from the wall 211 may also have only one receiving groove 251, in which case the two current collectors 24 are spaced apart along the first direction Y within the same receiving groove 251.

[0232] For example, the receiving groove 251 extends through the surfaces of both sides of the insulating member 25 in the second direction Z to facilitate the assembly of the current collecting member 24 into the receiving groove 251.

[0233] In this embodiment, by providing a receiving groove 251 for accommodating the current collector 24 on the side of the insulating member 25 away from the wall portion 211, the current collector 24 can be accommodated in the receiving groove 251 of the insulating member 25. With this structure, the battery cell 20 can achieve the following: on the one hand, the current collector 24 and the insulating member 25 share a portion of the space in the thickness direction X of the wall portion, which is beneficial to improving the internal space utilization of the battery cell 20. On the other hand, it can achieve the effect of the insulating member 25 covering the current collector 24, thereby improving the insulation and isolation effect of the insulating member 25 on the current collector 24 and the wall portion 211, while also achieving the function of the insulating member 25 insulating and isolating the current collector 24 and other components, which is beneficial to further reduce the risk of internal short circuits in the battery cell 20 during use.

[0234] In some embodiments, see Figure 4 and Figure 5As shown, the electrode assembly 22 also includes a main body 221, with a tab 222 connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. An insulating member 25 is located between the wall 211 and the main body 221. Along the thickness direction X of the wall, the insulating member 25 abuts against the end of the main body 221 where the tab 222 is located.

[0235] Along the thickness direction X of the wall portion, the insulating member 25 abuts against the end of the main body portion 221 where the tab 222 is provided. That is, the surface of the insulating member 25 facing away from the wall portion 211 and having a receiving groove 251 abuts against the end of the main body portion 221 where the tab 222 is provided, so that at least a portion of the tab 222 can also be accommodated in the corresponding receiving groove 251.

[0236] In this embodiment, the tab 222 is connected to the end of the main body 221 of the electrode assembly 22 facing the wall 211 in the thickness direction X of the wall portion, so that both the tab 222 and the current collector 24 are located at the end of the main body 221 facing the wall 211, thereby reducing the connection difficulty between the tab 222 and the current collector 24. In addition, by abutting the insulating member 25 against the end of the main body 221 where the tab 222 is provided in the thickness direction X of the wall portion, the insulating member 25 and the electrode assembly 22 can play a role in supporting and restricting each other within the housing 21, thereby reducing the risk of shaking or displacement of the insulating member 25 and the electrode assembly 22 during use.

[0237] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has a receiving cavity with a second opening 2121 inside, and the electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the second opening 2121 and is a wall portion 211.

[0238] The end cap 213 is a wall portion 211, that is, the electrode terminal 23 is disposed on the end cap 213 of the housing 21. Correspondingly, the insulating member 25 is disposed on the side of the end cap 213 facing the electrode assembly 22.

[0239] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the second opening 2121 of the casing 212, the battery cell 20 with this structure is easy to assemble the electrode terminal 23 onto the end cap 213, which helps to reduce the assembly difficulty of the electrode terminal 23 and reduces the connection difficulty between the current collector 24 and the electrode terminal 23 and between the current collector 24 and the tab 222, thereby effectively reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0240] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 can include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the thickness direction X of the wall portion, one end of the side wall is connected to the bottom wall, and the other end surrounds to form a second opening 2121. The side wall and the bottom wall together define a receiving cavity. The electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the second opening 2121. The bottom wall is a wall portion 211.

[0241] The shell 212 includes integrally formed side walls and bottom walls, meaning that the shell 212 is manufactured using an integral forming process, such as stamping, casting, or extrusion molding. In other words, the side walls and bottom walls of the shell 212 are an integral structure.

[0242] The bottom wall is a wall portion 211, that is, the electrode terminal 23 is disposed on the bottom wall of the housing 212, and correspondingly, the insulating member 25 is disposed on the side of the bottom wall of the housing 212 facing the electrode assembly 22.

[0243] In this embodiment, by setting the wall portion 211 of the outer casing 21 as a wall of the casing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the wall portion 211 equipped with the electrode terminals 23 far away from the end cap 213, so that there is no direct connection between the wall portion 211 and the end cap 213. This can alleviate the phenomenon that the force generated when the electrode terminals 23 pull or twist the wall portion 211 acts on the end cap 213, thereby reducing the risk of connection failure between the end cap 213 and the casing 212, and thus helping to reduce the leakage risk of the battery cell 20 during use.

[0244] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0245] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0246] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0247] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0248] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0249] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0250] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0251] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0252] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0253] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0254] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0255] 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, characterized in that, include: The outer shell has walls; An electrode assembly, housed within the housing, the electrode assembly having tabs; Electrode terminals are disposed on the wall portion; A current collector is disposed between the wall portion and the electrode assembly. The current collector includes a first connection area and a second connection area that are connected to each other. The first connection area is connected to the electrode terminal, and the second connection area is connected to the tab. as well as An insulating element is disposed on the side of the wall portion facing the electrode assembly to insulate and isolate the wall portion and the second connection area; The second connection area is provided with an insulating layer, which covers at least a portion of the surface of the second connection area facing the insulating member in the thickness direction of the wall portion, and the melting point of the insulating layer material is greater than the melting point of the insulating member material.

2. The battery cell according to claim 1, characterized in that, The first connection area and the second connection area are arranged along a first direction, and the insulating layer covers at least a portion of the end face of the second connection area away from the first connection area in the first direction, the first direction being perpendicular to the thickness direction of the wall portion.

3. The battery cell according to claim 1, characterized in that, The insulating layer covers at least a portion of the second connection area that is away from the surface of the insulating member in the thickness direction of the wall portion.

4. The battery cell according to claim 1, characterized in that, The first connection area and the second connection area are arranged along a first direction, and the insulating layer covers at least a portion of the surface of at least one side of the second connection area in a second direction. The first direction, the second direction and the thickness direction of the wall are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that, The insulating layer covers at least a portion of the surface of the second connection region on both sides in the second direction.

6. The battery cell according to claim 1, characterized in that, The first connection area and the second connection area are arranged along a first direction, and the insulating layer surrounds and forms an assembly cavity with a first opening, the first opening being located on one side of the insulating layer in the first direction; Wherein, along the first direction, the end of the second connection area away from the first connection area is inserted into the assembly cavity.

7. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the insulating layer has a first insulating portion located on the surface of the second connection area facing the insulating member, the thickness of the first insulating portion being D, satisfying 0.2mm≤D≤2mm.

8. The battery cell according to claim 1, characterized in that, The insulating layer has a melting point greater than or equal to 250°C.

9. The battery cell according to claim 1, characterized in that, The insulating layer has a resistivity greater than or equal to 100MΩ.

10. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, a gap is formed between the second connection area and the insulating member.

11. The battery cell according to claim 10, characterized in that, Along the thickness direction of the wall portion, the size of the gap between the second connection area and the insulating member is L. The insulating layer has a first insulating portion located on the surface of the second connection area facing the insulating member, and the thickness of the first insulating portion is D, satisfying L≥D.

12. The battery cell according to claim 10, characterized in that, Along the thickness direction of the wall portion, the size of the gap between the second connection area and the insulating member is L, which satisfies 0.1mm≤L≤2mm.

13. The battery cell according to claim 1, characterized in that, The first connection area and the second connection area are arranged along a first direction, and the battery cell includes a plurality of electrode components. The plurality of electrode components are stacked along a second direction, and the first direction, the second direction and the thickness direction of the wall are perpendicular to each other. The current collecting component includes a plurality of second connection areas, each of which is connected to one end of the first connection area in the first direction, and the plurality of second connection areas are spaced apart along the second direction. Each second connection area is connected to at least one tab of the electrode assembly.

14. The battery cell according to claim 1, characterized in that, The current collection component further includes a bending region, which connects the first connection region and the second connection region; Wherein, along the thickness direction of the wall portion, the surface of the first connection area facing the wall portion is farther away from the wall portion than the surface of the second connection area facing the wall portion, and the surface of the first connection area facing the wall portion is connected to the electrode terminal.

15. The battery cell according to claim 14, characterized in that, Along the thickness direction of the wall portion, the surface of the first connecting region facing the wall portion is farther away from the wall portion than the surface of the second connecting region facing away from the wall portion, and the surface of the second connecting region facing away from the wall portion is connected to the tab.

16. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the surface of the first connection area facing the wall portion has a protruding connection portion, which is connected to the electrode terminal; The insulating component is provided with a through hole, which penetrates the insulating component along the thickness direction of the wall portion, and the connecting portion and / or the electrode terminal are inserted into the through hole.

17. The battery cell according to claim 16, characterized in that, Along the thickness direction of the wall portion, the first connecting area is opposite to the surface of the wall portion and a groove is formed at the position corresponding to the connecting portion.

18. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the insulating member has a receiving groove on the side opposite to the wall portion, and the current collecting member is disposed in the receiving groove.

19. The battery cell according to claim 18, characterized in that, The electrode assembly further includes a main body, the tab is connected to one end of the main body facing the wall in the thickness direction of the wall, and the insulating member is located between the wall and the main body; Wherein, along the thickness direction of the wall portion, the insulating member abuts against the end of the main body portion where the electrode tab is provided.

20. The battery cell according to any one of claims 1-19, characterized in that, The outer casing includes: The housing has an internal cavity with a second opening, and the electrode assembly is housed within the cavity. End cap, to close the second opening; The end cap is the wall portion.

21. The battery cell according to any one of claims 1-19, characterized in that, The outer casing includes: The housing includes an integrally formed sidewall and a bottom wall. The sidewall surrounds the bottom wall. Along the thickness direction of the wall portion, one end of the sidewall is connected to the bottom wall, and the other end forms a second opening. The sidewall and the bottom wall together define a receiving cavity, and the electrode assembly is received in the receiving cavity. End cap, to close the second opening; The bottom wall is the wall portion.

22. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-21.

23. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-21, the battery cell being used to provide electrical energy.

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