Battery monomer, battery device, power utilization device and energy storage device

Abstract

The utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode terminal, a first insulating part, an electrode assembly and a second insulating part, the electrode terminal is provided on a wall portion of the case. At least a portion of the first insulator is located between the electrode terminal and the wall portion in a thickness direction of the wall portion. The electrode assembly comprises a main body part and a tab, the tab is connected to one end, in the first direction, of the main body part, the tab is connected to the electrode terminal, a gap is formed between the main body part and the first insulating part in the first direction, and the tab comprises a first part located in the gap. The second insulating part is arranged between the wall part and the tab, and in the same plane perpendicular to the thickness direction of the wall part, the orthographic projection of the first part is at least partially overlapped with the orthographic projection of the second insulating part. Therefore, the phenomenon that the first part of the tab is overlapped with the wall part is relieved, and the short-circuit risk of the tab and the wall part is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery device, an electric device, and an energy storage device. Background Art

[0002] In recent years, new energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the strong promotion of new energy vehicles, the demand for power battery products is also increasing day by day. Among them, as the core component of new energy vehicles, the battery device has high requirements in terms of use stability and reliability.

[0003] In battery technology, a battery cell includes a housing and an electrode assembly disposed inside the housing. To achieve the input or output of electrical energy of the battery cell, electrode terminals are generally installed on the housing of the battery cell in an insulated manner, and the electrode terminals are connected to the tabs of the electrode assembly to achieve the input or output of electrical energy of the battery cell through the electrode terminals. However, in the existing battery cell, there is a risk that the tab and the housing are prone to overlap during use, resulting in a short circuit of the battery cell, and even risks such as fire or explosion, which is not conducive to improving the use reliability of the battery cell. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery cell, a battery device, an electric device, and an energy storage device, which can effectively improve the use reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including a housing, electrode terminals, a first insulating member, an electrode assembly, and a second insulating member; the housing has a wall portion; the electrode terminals are disposed on the wall portion; the first insulating member is disposed inside the housing, and at least a part of the first insulating member is located between the electrode terminals and the wall portion in the thickness direction of the wall portion; the electrode assembly is accommodated inside the housing, the electrode assembly includes a main body portion and a tab, the tab is connected to one end of the main body portion in a first direction, the tab is connected to the electrode terminals, along the first direction, a gap is formed between the main body portion and the first insulating member, the tab includes a first portion located in the gap, the first portion is connected to the main body portion, and the first direction is perpendicular to the thickness direction of the wall portion; the second insulating member is disposed between the wall portion and the tab along the thickness direction of the wall portion, and in the same plane perpendicular to the thickness direction of the wall portion, at least a part of the orthographic projection of the first portion overlaps with the orthographic projection of the second insulating member.

[0006] In the above technical solution, an electrode terminal is provided on the wall portion, and the electrode terminal is connected to the tab of the electrode assembly to input or output electrical energy of the battery cell through the electrode terminal. Among them, a first insulating member is provided inside the housing, and at least a part of the first insulating member is located between the electrode terminal and the wall portion in the thickness direction of the wall portion, so that the first insulating member can insulate and isolate the electrode terminal and the wall portion, which is beneficial to reducing the short - circuit risk between the wall portion and the electrode terminal. By providing a second insulating member on the side of the wall portion facing the electrode assembly, the second insulating member is located between the tab and the wall portion in the thickness direction of the wall portion, and at least a part of the projection of the first part of the tab located in the gap between the main body portion and the first insulating member in the thickness direction of the wall portion is located inside the second insulating member, so that the second insulating member can play an insulating and isolating effect between the first part of the tab located in the gap and the wall portion, thereby effectively alleviating the phenomenon that the first part of the tab located in the gap overlaps with the wall portion during use, reducing the short - circuit risk between the tab and the wall portion, and further effectively reducing the risk of internal short - circuit or fire and explosion caused by short - circuit during the use of the battery cell, which is beneficial to improving the use reliability of the battery cell.

[0007] In some embodiments, in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first part is entirely located within the orthographic projection of the second insulating member.

[0008] In the above technical solution, by setting the projection of the first part of the tab located in the gap in the thickness direction of the wall portion to be entirely located inside the second insulating member, the effect of the second insulating member insulating and isolating the first part of the tab and the wall portion is improved, thereby further alleviating the phenomenon that the first part of the tab located in the gap overlaps with the wall portion during use, further reducing the short - circuit risk between the tab and the wall portion, and further reducing the risk of internal short - circuit or fire and explosion caused by short - circuit during the use of the battery cell.

[0009] In some embodiments, along the thickness direction of the wall portion, a part of the second insulating member is located between the wall portion and the first insulating member.

[0010] In the above technical solution, by setting a part of the second insulating member to be located between the wall portion and the first insulating member, a part of the orthographic projections of the second insulating member and the first insulating member in the same plane perpendicular to the thickness direction of the wall portion overlap with each other, so that a part of the second insulating member overlaps with the first insulating member in the thickness direction of the wall portion. For the battery cell with this structure, on the one hand, the first insulating member and the wall portion can also play a certain role in clamping and fixing the second insulating member, which is beneficial to improving the stability of the second insulating member arranged inside the housing. On the other hand, it can further improve the effect of the second insulating member in separating the wall portion and the first part of the tab, so as to further reduce the risk of short - circuit between the first part of the tab and the wall portion.

[0011] In some embodiments, along the thickness direction of the wall portion, a part of the second insulating member is located between the wall portion and the main body portion.

[0012] In the above technical solution, by arranging a part of the second insulating member between the wall portion and the main body portion of the electrode assembly, a part of the positive projection of the second insulating member and the main body portion of the electrode assembly in the same plane perpendicular to the thickness direction of the wall portion overlaps each other, so that a part of the second insulating member overlaps with the main body portion of the electrode assembly in the thickness direction of the wall portion. For the battery cell adopting this structure, on the one hand, the wall portion and the main body portion of the electrode assembly can also play a certain role in clamping and fixing the second insulating member, which is beneficial to improving the stability of the second insulating member arranged in the outer shell. On the other hand, the effect of the second insulating member separating the wall portion and the first part of the tab can be further improved, so as to further reduce the risk of short circuit between the first part of the tab and the wall portion.

[0013] In some embodiments, along the second direction, both ends of the second insulating member respectively extend beyond both ends of the first part, and the second direction is perpendicular to the first direction and the thickness direction of the wall portion.

[0014] In the above technical solution, by arranging both ends of the second insulating member in the second direction to respectively extend beyond both ends of the first part of the tab, the size of the second insulating member in the second direction is larger than the size of the first part of the tab in the second direction, so that the effect of the second insulating member insulating and isolating the wall portion and the first part of the tab can be further improved, which is beneficial to further reducing the risk of short circuit between the first part of the tab and the wall portion.

[0015] In some embodiments, along the second direction, the first part has opposite first and second ends; wherein, the dimension that the second insulating member extends beyond the first end in the second direction is L1, and 5mm ≤ L1 ≤ 20mm; and / or, the dimension that the second insulating member extends beyond the second end in the second direction is L2, and 5mm ≤ L2 ≤ 20mm.

[0016] In the above technical solution, by setting the size of the portion of the second insulating member that extends beyond the first end of the first portion in the second direction to be 5 mm to 20 mm, on the one hand, it can enhance the effect of the partition wall portion of the second insulating member and the first portion of the tab, so as to reduce the risk of short circuit between the first portion of the tab and the wall portion. On the other hand, it can alleviate the phenomenon that the second insulating member occupies too much space due to the excessive size of the second insulating member extending beyond, which is beneficial to reducing the assembly difficulty of the second insulating member and can reduce the interference effect between the second insulating member and other components. Similarly, by setting the size of the portion of the second insulating member that extends beyond the second end of the first portion in the second direction to be 5 mm to 20 mm, on the one hand, it can enhance the effect of the partition wall portion of the second insulating member and the first portion of the tab, so as to reduce the risk of short circuit between the first portion of the tab and the wall portion. On the other hand, it can alleviate the phenomenon that the second insulating member occupies too much space due to the excessive size of the second insulating member extending beyond, which is beneficial to reducing the assembly difficulty of the second insulating member and can reduce the interference effect between the second insulating member and other components.

[0017] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, and the second insulating member is connected to the first surface.

[0018] In the above technical solution, by connecting the second insulating member to the first surface of the wall portion facing the electrode assembly, on the one hand, it can enhance the stability of the second insulating member assembled between the wall portion and the tab, which is beneficial to reducing phenomena such as shaking or displacement of the second insulating member during use. On the other hand, it can achieve that the second insulating member better partitions the first portion of the wall portion and the tab, which is beneficial to enhancing the effect of the second insulating member insulating and isolating the first portion of the wall portion and the tab.

[0019] In some embodiments, the second insulating member is bonded to the first surface.

[0020] In the above technical solution, by bonding the second insulating member to the first surface of the wall portion facing the electrode assembly, the structure is simple and convenient for assembly, which is beneficial to reducing the difficulty of connecting the second insulating member to the first surface of the wall portion, so as to improve the assembly efficiency of the battery cell.

[0021] In some embodiments, along the thickness direction of the wall portion, the thickness of the second insulating member is D, satisfying 10 μm ≤ D ≤ 30 μm.

[0022] In the above technical solution, the thickness of the second insulating member in the thickness direction of the wall portion is 10 micrometers to 30 micrometers. On the one hand, setting the thickness of the second insulating member to be greater than or equal to 10 micrometers can enhance the structural strength of the second insulating member, which is beneficial to reducing the risk of damage or scratching of the second insulating member during use or assembly, and can also enhance the effect of insulating the partition wall portion and the first part of the tab by the second insulating member, which is beneficial to alleviating the phenomenon of breakdown of the second insulating member, thereby reducing the risk of short circuit between the wall portion and the first part of the tab. On the other hand, setting the thickness of the second insulating member to be less than or equal to 30 micrometers can reduce the space occupied by the second insulating member in the thickness direction of the wall portion, thereby improving the utilization rate of the internal space of the battery cell and reducing the interference effect between the second insulating member and the first insulating member or the electrode assembly.

[0023] In some embodiments, the material of the second insulating member is polyimide or polypropylene.

[0024] In the above technical solution, by setting the material of the second insulating member to be polyimide or polypropylene, the second insulating member has good insulation performance and good heat resistance, which is beneficial to alleviating phenomena such as shrinkage or melting of the second insulating member during use, thereby improving the use stability of the second insulating member and enhancing the stability of insulating the partition wall portion and the first part of the tab by the second insulating member.

[0025] In some embodiments, the outer surface of the main body portion is coated with an insulating film, and the insulating film is configured to insulate and isolate the main body portion and the outer shell.

[0026] In the above technical solution, by coating the insulating film on the outer surface of the main body portion, the insulating film can insulate and isolate the main body portion of the electrode assembly and the outer shell, which is beneficial to reducing the risk of mutual lap short circuit between the main body portion of the electrode assembly and the outer shell and improving the use reliability of the battery cell.

[0027] In some embodiments, along the first direction, the insulating film is spaced apart from the first insulating member, and along the thickness direction of the wall portion, a part of the second insulating member is located between the wall portion and the insulating film.

[0028] In the above technical solution, by setting a part of the second insulating member to be located between the wall portion and the insulating film, a part of the positive projections of the second insulating member and the insulating film in the same plane perpendicular to the thickness direction of the wall portion overlap each other, so that a part of the second insulating member overlaps with the insulating film in the thickness direction of the wall portion, thereby further enhancing the effect of the second insulating member in partitioning the wall portion and the first part of the tab and further reducing the risk of short circuit between the first part of the tab and the wall portion.

[0029] In some embodiments, the tab further includes a second portion inserted into the first insulating member along the first direction, the second portion being connected to the first portion and the second portion being connected to the electrode terminal.

[0030] In the above technical solution, the tab further has a second portion inserted into the first insulating member, and the second portion is connected to the electrode terminal to achieve electrical connection between the electrode terminal and the electrode assembly. The battery cell adopting this structure can also insulate and isolate the second portion of the tab and the housing through the first insulating member, which is beneficial to reducing the short-circuit risk between the housing and the second portion of the tab, so as to improve the use reliability of the battery cell.

[0031] In some embodiments, an installation cavity is formed inside the first insulating member, the installation cavity penetrates through one side of the first insulating member facing the main body portion along the first direction, a part of the electrode terminal penetrates into the first insulating member along the thickness direction of the wall portion and extends into the installation cavity, and the second portion is located in the installation cavity and is connected to the electrode terminal.

[0032] In the above technical solution, by providing an installation cavity inside the first insulating member, and the installation cavity penetrates through one side of the first insulating member facing the main body portion of the electrode assembly along the first direction, it is convenient to insert the second portion of the tab provided at one end of the main body portion in the first direction into the installation cavity of the first insulating member, which is beneficial to reducing the difficulty of inserting the second portion of the tab into the first insulating member, and can reduce the difficulty of connecting the second portion of the tab and the part of the electrode terminal extending into the installation cavity, so as to reduce the assembly difficulty of the battery cell and improve the production efficiency of the battery cell.

[0033] In some embodiments, the first insulating member includes an insulating body and a separator; along the thickness direction of the wall portion, a part of the insulating body is located between the electrode terminal and the wall portion, a receiving groove is provided on a side of the insulating body facing away from the wall portion, a part of the electrode terminal penetrates into the bottom wall of the receiving groove and extends into the receiving groove, and the receiving groove penetrates through one side of the insulating body facing the main body portion along the first direction; the separator is connected to the insulating body, the separator is disposed opposite to the bottom surface of the receiving groove in the thickness direction of the wall portion, and the separator and the groove wall surface of the receiving groove jointly define the installation cavity.

[0034] In the above technical solution, the first insulating member includes an insulating body and a partition body. On a side of the insulating body facing away from the wall portion, a receiving groove is provided. The receiving groove penetrates through a side of the insulating body facing the main body portion along a first direction, and the partition body is connected to the insulating body and together with a groove wall surface of the receiving groove defines an installation cavity. The first insulating member having such a structure facilitates arranging a part of the electrode terminal to extend into the installation cavity, and can first insert a second part of the tab into the receiving groove and connect it to the electrode terminal, and then assemble the partition body and the insulating body with each other to form the installation cavity, thereby being able to reduce the assembly difficulty between the tab and the electrode terminal and improve the manufacturing efficiency of the battery cell.

[0035] In some embodiments, the partition body and the insulating body are separately provided and detachably connected; alternatively, the partition body and the insulating body are an integral structure, one end of the partition body can rotate relative to the insulating body, and the other end can be snap-connected to the insulating body.

[0036] In the above technical solution, by setting the partition body and the insulating body as a split structure and detachably connecting the partition body and the insulating body, it is convenient to quickly disassemble and assemble the partition body and the insulating body during subsequent use, which is beneficial to reducing the difficulty of maintaining the tab and the electrode terminal and reducing the subsequent maintenance cost of the battery cell. Similarly, by setting the partition body and the insulating body as an integral structure, and one end of the partition body can rotate relative to the insulating body and the other end can be snap-connected to the insulating body, the partition body is connected to the insulating body and together with the groove wall surface of the receiving groove defines the installation cavity. The first insulating member having such a structure is convenient to quickly disassemble and assemble the partition body and the insulating body during subsequent use, which is beneficial to reducing the difficulty of maintaining the tab and the electrode terminal and reducing the subsequent maintenance cost of the battery cell.

[0037] In some embodiments, the electrode assembly includes two tabs with opposite polarities, and the two tabs are respectively connected to two ends of the main body portion along the first direction; wherein, the battery cell includes two electrode terminals, two first insulating members and two second insulating members. The two electrode terminals are arranged on the wall portion at intervals along the first direction, the two first insulating members are respectively located on two sides of the main body portion in the first direction, the first insulating members are arranged corresponding to the electrode terminals, the two second insulating members are arranged at intervals along the first direction, and each second insulating member is arranged corresponding to one tab.

[0038] In the above technical solution, the electrode assembly is provided with two tab ears, and the two tab ears are respectively connected to two ends of the main body portion in the first direction. Correspondingly, the battery cell further includes two electrode terminals, two first insulating members, and two second insulating members, and the tab ears, the electrode terminals, the first insulating members, and the second insulating members are all in a one-to-one correspondence structure, so as to realize the input or output of the positive and negative electrodes of the battery cell while realizing the insulating isolation between the wall portion and the two tab ears of the electrode assembly, thereby reducing the short-circuit risk between the electrode assembly and the wall portion and being beneficial to improving the use reliability of the battery cell.

[0039] In some embodiments, the outer shell includes a housing and an end cap. An accommodating cavity with an opening is formed inside the housing. The electrode assembly is accommodated in the accommodating cavity, and the end cap closes the opening. The end cap is the wall portion. Wherein, the electrode assembly is a laminated structure, and the positive electrode plate and the negative electrode plate of the electrode assembly are laminated along the thickness direction of the wall portion, and the end cap is the wall with the largest area among the multiple walls of the outer shell.

[0040] In the above technical solution, by setting the wall portion of the outer shell as the end cap for closing the opening of the housing, the battery cell with this structure is convenient for assembling the electrode terminals on the end cap, and can reduce the difficulty of mutually assembling and connecting the electrode terminals and the tab ears, thereby being beneficial to reducing the manufacturing difficulty of the battery cell to improve the production efficiency of the battery cell. And by setting the end cap as the wall with the largest area among the multiple walls of the outer shell, the wall portion is also the wall with the largest area among the multiple walls of the outer shell, so it is convenient to set the electrode terminals on the wall portion and convenient to set the second insulating member between the wall portion and the tab ears, which is beneficial to reducing the assembly difficulty of the battery cell. In addition, by setting the electrode assembly as a laminated structure, and the positive electrode plate and the negative electrode plate of the electrode assembly are laminated along the thickness direction of the wall portion, on the one hand, it can reduce the manufacturing difficulty of the battery cell, and on the other hand, it is convenient to increase the volume of the electrode assembly to realize a battery cell with a large capacitance.

[0041] Second, the embodiment of the present application further provides a battery device, including a plurality of the above-mentioned battery cells.

[0042] Third, the embodiment of the present application further provides an electrical device, including the above-mentioned battery cell or the above-mentioned battery device.

[0043] Fourth, the embodiment of the present application further provides an energy storage device, including the above-mentioned battery cell or the above-mentioned battery device. Description of the Drawings

[0044] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0045] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0046] Figure 2 Exploded view of the structure of a battery device provided by some embodiments of the present application;

[0047] Figure 3 Structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0048] Figure 4 Exploded view of the structure of a battery cell provided by some embodiments of the present application;

[0049] Figure 5 Cross-sectional view of a battery cell provided by some embodiments of the present application;

[0050] Figure 6 For Figure 5 Partial enlarged view of the A position of the battery cell shown;

[0051] Figure 7 Front view in the thickness direction of the wall part after the electrode assembly and the wall part are assembled with each other provided by some embodiments of the present application;

[0052] Figure 8 Structural schematic diagram of a first insulating member provided by some embodiments of the present application;

[0053] Figure 9 Cross-sectional view of an energy storage device provided by some embodiments of the present application.

[0054] Icons: 1000 - vehicle; 100 - battery device; 10 - box body; 11 - first box body; 12 - second box body; 20 - battery cell; 21 - housing; 211 - wall portion; 2111 - mounting hole; 2112 - first surface; 212 - shell; 213 - end cap; 22 - electrode terminal; 23 - first insulating member; 231 - mounting cavity; 232 - insulating body; 2321 - receiving groove; 2322 - cavity; 233 - separator; 24 - electrode assembly; 241 - main body portion; 242 - tab; 2421 - first portion; 2421a - first end; 2421b - second end; 2422 - second portion; 25 - second insulating member; 26 - gap; 27 - insulating film; 28 - third insulating member; 29 - seal; 200 - controller; 300 - motor; 2000 - energy storage device; 2001 - energy storage box body; X - thickness direction of the wall portion; Y - first direction; Z - second direction. Detailed implementation manners [[ID=�]]

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the protection scope of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0057] Referring to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0058] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0059] The term "and / or" in the present application is merely an association relationship describing the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and back associated objects.

[0060] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0061] The "multiple" mentioned in the present application refers to two or more (including two).

[0062] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0063] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0064] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can play a role in preventing the short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0065] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0066] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0067] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, the metal foil may include silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. A composite current collector may include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05At least one of O2) and its modified compounds, etc.

[0069] In some embodiments, the positive electrode can use a foam metal. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0070] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0071] As an example, the negative electrode current collector can use a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. can be used. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. The composite current collector can include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0072] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0073] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0074] As an example, the negative electrode active material can use the negative electrode active material for battery monomers known in the art. As an example, the negative electrode active material can 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. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0075] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0076] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0077] In some embodiments, the separator is a separator membrane. The types of separator membranes can be various, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0078] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes. [[ID=??]]

[0079] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0080] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0081] In some embodiments, the electrolyte salt can 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0082] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene 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 can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0083] Among them, the gel-like electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0084] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0085] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0086] As an example, the inorganic solid electrolyte can include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0087] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0088] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0089] In some embodiments, the electrode assembly has a stacked structure.

[0090] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0091] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0092] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0093] As an example, multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0094] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0095] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0096] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0097] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0098] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0099] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0100] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0101] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0102] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0103] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0104] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0105] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0106] As an example, the box body can be a part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0107] The energy storage device mentioned in the embodiments of the present application includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0108] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires an energy storage device.

[0109] In some embodiments, the energy storage device includes a box body, and at least one side of the box body is provided with a door. The energy storage device is an energy storage container or an energy storage cabinet.

[0110] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0111] Battery devices have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient, and are an important part of the development of new energy today. The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, the safety of the battery device also needs to be considered.

[0112] For a general battery cell, the battery cell includes a housing and an electrode assembly accommodated in the housing. The electrode assembly includes a main body portion and a tab connected to the main body portion. In order to realize the input or output of electrical energy of the battery cell and to reduce the phenomenon of the housing being charged, electrode terminals are usually installed on the housing in an insulated manner, and the electrode terminals are connected to the tabs of the electrode assembly to realize the input or output of electrical energy of the battery cell through the electrode terminals, and can alleviate the phenomenon of the housing of the battery cell being charged during use. However, in a battery cell with this structure, since the tabs are relatively long, especially in a long battery cell, and the tabs and the electrode terminals are located on different sides of the main body portion, the battery cell is very likely to have a phenomenon that the tabs and the wall of the housing provided with the electrode terminals overlap each other during use, so that the battery cell is prone to the risk of internal short circuit, and even may cause risks such as fire or explosion of the battery cell, which is not conducive to improving the use reliability of the battery cell.

[0113] Based on the above considerations, in order to solve the problem of low reliability in the use of battery cells, an embodiment of the present application provides a battery cell, which includes a housing, an electrode terminal, a first insulating member, an electrode assembly, and a second insulating member. The housing has a wall portion. The electrode terminal is disposed on the wall portion. The first insulating member is disposed inside the housing, and at least a part of the first insulating member is located between the electrode terminal and the wall portion in the thickness direction of the wall portion. The electrode assembly is accommodated inside the housing, and the electrode assembly includes a main body portion and a tab. The tab is connected to one end of the main body portion in a first direction, and the tab is connected to the electrode terminal. A gap is formed between the main body portion and the first insulating member along the first direction. The tab includes a first portion located in the gap. The first portion is connected to the main body portion of the electrode assembly. The first direction is perpendicular to the thickness direction of the wall portion. The second insulating member is disposed between the wall portion and the tab along the thickness direction of the wall portion. In the same plane perpendicular to the thickness direction of the wall portion, at least a part of the orthographic projection of the first portion overlaps with the orthographic projection of the second insulating member.

[0114] In the battery cell with such a structure, an electrode terminal is disposed on the wall portion, and the electrode terminal is connected to the tab of the electrode assembly to input or output electrical energy of the battery cell through the electrode terminal. Among them, a first insulating member is disposed inside the housing, and at least a part of the first insulating member is located between the electrode terminal and the wall portion in the thickness direction of the wall portion, so that the first insulating member can insulate and isolate the electrode terminal and the wall portion, which is beneficial to reducing the short-circuit risk between the wall portion and the electrode terminal. By disposing a second insulating member on the side of the wall portion facing the electrode assembly, the second insulating member is located between the tab and the wall portion in the thickness direction of the wall portion, and at least a part of the projection of the first portion of the tab located in the gap between the main body portion and the first insulating member in the thickness direction of the wall portion is located inside the second insulating member, so that the second insulating member can play an insulating and isolating effect between the first portion of the tab located in the gap and the wall portion, thereby effectively alleviating the phenomenon that the first portion of the tab located in the gap overlaps with the wall portion during use, reducing the short-circuit risk between the tab and the wall portion, and further effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit during the use of the battery cell, which is beneficial to improving the reliability of the battery cell in use.

[0115] The battery cell disclosed in the embodiment of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cell, battery device, etc. disclosed in the present application. In this way, it is beneficial to alleviate the problems of internal short circuit or fire and explosion during the use of the battery cell, so as to improve the reliability of the battery cell in use.

[0116] The embodiments of the present application provide an electrical device using a battery cell or a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0117] For the convenience of description, the following embodiments take a vehicle as an example of an electrical device according to an embodiment of the present application for description.

[0118] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, or the like. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 may be disposed at the bottom of the vehicle 1000, may also be disposed at the head of the vehicle 1000, or may also be disposed at the tail of the vehicle 1000. The battery device 100 may be used to supply power to the vehicle 1000. For example, the battery device 100 may be used as an operating power source or a power source for use in the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0119] In some embodiments of the present application, the battery device 100 may not only be used as an operating power source or a power source for use in the vehicle 1000, but also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0120] Please refer to Figure 2 and Figure 3 , Figure 2 , which is an exploded view of the structure of the battery device 100 provided by some embodiments of the present application, Figure 3 , which is a schematic structural diagram of a battery cell 20 provided by some embodiments of the present application. The battery device 100 includes a box body 10 and battery cells 20. The battery cells 20 are used to be accommodated in the box body 10.

[0121] Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure. The first box body 11 is covered on the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the first box body 11 is covered on the open side of the second box body 12.

[0122] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 the box body 10 is in the shape of a cuboid.

[0123] In the battery device 100, the number of battery cells 20 arranged in the box body 10 can be one or multiple. When there are multiple battery cells 20 arranged in the box body 10, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery device 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0124] In some embodiments, the battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for connecting the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0125] Among them, 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 thereto. The battery cell 20 can be in the shape of a cuboid, a cylinder, a prism, or other shapes, etc. Exemplarily, in Figure 3 the battery cell 20 is in a cuboid structure.

[0126] According to some embodiments of the present application, refer to Figure 3 , and please further refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4Exploded view of the structure of the battery cell 20 provided by some embodiments of the present application, Figure 5 Cross-sectional view of the battery cell 20 provided by some embodiments of the present application, Figure 6 For Figure 5 Partial enlarged view of the battery cell 20 at position A shown in the figure, Figure 7 Front view of the electrode assembly 24 and the wall portion 211 after being assembled with each other in the thickness direction X of the wall portion provided by some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode terminal 22, a first insulating member 23, an electrode assembly 24, and a second insulating member 25. The housing 21 has a wall portion 211. The electrode terminal 22 is disposed on the wall portion 211. The first insulating member 23 is disposed inside the housing 21, and at least a part of the first insulating member 23 is located between the electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion. The electrode assembly 24 is accommodated in the housing 21. The electrode assembly 24 includes a main body portion 241 and a tab 242. The tab 242 is connected to one end of the main body portion 241 in the first direction Y. The tab 242 is connected to the electrode terminal 22. Along the first direction Y, a gap 26 is formed between the main body portion 241 and the first insulating member 23. The tab 242 includes a first portion 2421 located in the gap 26. The first portion 2421 is connected to the main body portion 241 of the electrode assembly 24. The first direction Y is perpendicular to the thickness direction X of the wall portion. The second insulating member 25 is disposed between the wall portion 211 and the tab 242 along the thickness direction X of the wall portion. In the same plane perpendicular to the thickness direction X of the wall portion, at least a part of the orthographic projection of the first portion 2421 overlaps with the orthographic projection of the second insulating member 25.

[0127] Among them, the housing 21 can also be used to accommodate an electrolyte, for example, an electrolyte solution. The housing 21 can be in various structural forms, such as a cylinder or a cuboid, etc. Similarly, the material of the housing 21 can also be various, such as copper, iron, aluminum, steel, or aluminum alloy, etc.

[0128] In some embodiments, the housing 21 may include a housing body 212 and an end cap 213. An accommodation cavity is formed inside the housing body 212. The accommodation cavity is used to accommodate the electrode assembly 24, and the accommodation cavity has an opening. That is to say, the housing body 212 is a hollow structure with an opening formed at one end. The end cap 213 is covered on the opening of the housing body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 24 and the electrolyte.

[0129] It should be noted that the wall portion 211 for installing the electrode terminal 22 can be the end cap 213 of the housing 21 or a wall of the housing body 212 of the housing 21. Exemplarily, in combination with Figure 3 and Figure 4As shown, 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 where the housing 212 and the end cap 213 are oppositely arranged, or the side wall where the housing 212 and the end cap 213 are adjacent and connected to each other.

[0130] When assembling the battery cell 20, the electrode assembly 24 can be first placed into the housing 212, and electrolyte can be filled into the housing 212. Then, the end cap 213 can be covered on the opening of the housing 212 to complete the assembly of the battery cell 20. Of course, in some embodiments, it can also be that the electrode assembly 24 is first placed into the housing 212, and the end cap 213 is covered on the opening of the housing 212. Then, electrolyte is filled into the housing 212 through the liquid injection hole on the outer shell 21 to complete the assembly of the battery cell 20.

[0131] The housing 212 can be of various shapes, such as a cylinder, a cuboid, or a prism structure, etc. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 is a cylinder structure, a cylinder structure housing 212 can be selected; if the electrode assembly 24 is a cuboid structure, a cuboid structure housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as the end cap 213 being a plate-like structure or a hollow structure with one end open, etc. Exemplarily, in Figure 3 it, the housing 212 is in the shape of a cuboid.

[0132] Of course, it can be understood that the outer shell 21 is not limited to the above structure. The outer shell 21 can also be other structures. For example, the outer shell 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings on opposite sides. One end cap 213 is correspondingly covered on one opening of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 24 and the electrolyte. That is to say, the housing 212 has openings formed on opposite sides, and the two end caps 213 are respectively covered on both sides of the housing 212 to close the corresponding openings.

[0133] It should be noted that the electrode assembly 24 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 24 can be various. For example, the electrode assembly 24 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.

[0134] Exemplarily, in the embodiment of the present application, the electrode assembly 24 is a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet, and the positive electrode sheet, the separator, and the negative electrode sheet are stacked along the thickness direction X of the wall portion.

[0135] Exemplarily, the separator is a separation membrane, and the main material of the separation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0136] Among them, the electrode assembly 24 includes a main body portion 241 and a tab 242. The main body portion 241 is the main component of the electrode assembly 24 that undergoes an electrochemical reaction in the battery cell 20. Exemplarily, in Figure 4 and Figure 5 the electrode assembly 24 includes two tabs 242. The polarities of the two tabs 242 are opposite. The two tabs 242 respectively output or input the positive and negative electrodes of the electrode assembly 24, and the two tabs 242 are respectively connected to both ends of the main body portion 241 in the first direction Y. The first direction Y, the second direction Z, and the thickness direction X of the wall portion are perpendicular to each other in pairs. Exemplarily, the first direction Y is the length direction of the battery cell 20, the second direction Z is the width direction of the battery cell 20, and the thickness direction X of the wall portion is the thickness direction of the battery cell 20. Of course, in other embodiments, the two tabs 242 may also be provided at the same end of the main body portion 241 in the first direction Y, or may both be provided on the side of the main body portion 241 facing the wall portion 211, etc. They may also be provided at both ends or the same end of the main body portion 241 in the first direction Y.

[0137] Optionally, as shown in Figure 6 in some embodiments, an insulating film 27 is further coated on the outer surface of the main body portion 241 of the electrode assembly 24. The insulating film 27 is configured to insulate and isolate the outer shell 21 and the main body portion 241 to reduce the risk of short circuit between the main body portion 241 and the outer shell 21.

[0138] It should be noted that the tab 242 of the electrode assembly 24 is a component formed by laminating and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated or regions on the negative electrode plate where the negative electrode active material layer is not coated. If the tab 242 is used to output the positive electrode of the electrode assembly 24, the tab 242 is a component formed by laminating and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated; if the tab 242 is used to output the negative electrode of the electrode assembly 24, the tab 242 is a component formed by laminating and connecting regions on the negative electrode plate where the negative electrode active material layer is not coated.

[0139] Optionally, the number of electrode assemblies 24 accommodated in the outer shell 21 can be one or more. Exemplarily, in Figure 4 the outer shell 21 of the battery cell 20 is provided with one electrode assembly 24. Of course, in other embodiments, the number of electrode assemblies 24 provided in the outer shell 21 can also be two, three, four, five, six, etc.

[0140] In the embodiment of the present application, the electrode terminal 22 is connected to the tab 242 of the electrode assembly 24, so that the electrode terminal 22 functions as an electrical connection to the electrode assembly 24 to serve as the output or input terminal of the battery cell 20, thereby enabling the output or input of electrical energy of the battery cell 20.

[0141] Exemplarily, the material of the electrode terminal 22 can also be various. For example, the material of the electrode terminal 22 can be copper, iron, aluminum, steel, or aluminum alloy, etc.

[0142] It should be noted that the electrode terminal 22 is insulatively mounted on the wall portion 211. That is to say, there is no electrical connection formed between the electrode terminal 22 and the wall portion 211 of the housing 21. Exemplarily, as shown in Figure 4 and Figure 6 , a first insulating member 23 is disposed in the housing 21 of the battery cell 20. At least a part of the first insulating member 23 is located between the electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion, so that the first insulating member 23 can insulatively isolate the wall portion 211 and the electrode terminal 22. Correspondingly, the battery cell 20 may further include a third insulating member 28. The third insulating member 28 is disposed on the side of the wall portion 211 facing away from the electrode assembly 24 in the thickness direction X of the wall portion, and at least a part of the third insulating member 28 is located between the electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion to insulatively isolate the electrode terminal 22 and the wall portion 211, thereby realizing the insulative mounting of the electrode terminal 22 on the wall portion 211 through the cooperation of the first insulating member 23 and the third insulating member 28.

[0143] Exemplarily, the materials of the first insulating member 23 and the third insulating member 28 can both be various. For example, the materials of the first insulating member 23 and the third insulating member 28 can be silicone, rubber, or plastic, etc.

[0144] Among them, in Figure 6In the embodiment of the present invention, the wall portion 211 is provided with a mounting hole 2111. The mounting hole 2111 passes through both sides of the wall portion 211 along the thickness direction X of the wall portion. The electrode terminal 22 is provided in the mounting hole 2111 along the thickness direction X of the wall portion, so that a portion of the electrode terminal 22 extends into the housing 21 to facilitate connection between the electrode terminal 22 and the electrode tab 242, and a portion of the electrode terminal 22 is located outside the housing 21 to facilitate connection between the electrode terminal 22 and the busbar. In the embodiment of the present application, the electrode terminal 22 includes a base, a post, and a rivet block. Along the thickness direction X of the wall portion, the base is located on the side of the wall portion 211 facing the electrode assembly 24, and the rivet block is located on the side of the wall portion 211 facing away from the electrode assembly 24. The post is provided in the mounting hole 211, one end of the post is connected to the base, and the rivet block is connected to the portion of the post extending out of the wall portion 211 facing away from the electrode assembly 24, so as to achieve riveted assembly of the electrode terminal 22 to the wall portion 211. It should be noted that the number of poles of the electrode terminal 22 can be one or more. If the electrode terminal 22 is provided with multiple poles, the wall portion 211 is correspondingly provided with multiple mounting holes 2111, each mounting hole 2111 is provided for a pole to pass through, and the multiple poles are connected between the base and the rivet block.

[0145] Optionally, the connection structure between the tab 242 and the electrode terminal 22 can be various. The tab 242 and the electrode terminal 22 can be directly connected, such as by welding or abutting. For example, Figure 6 In the embodiment, the tab 242 is directly connected to the base of the electrode terminal 22. Of course, the tab 242 and the electrode terminal 22 may also be indirectly connected. For example, in other embodiments, the battery cell 20 may further include a current collecting member disposed within the housing 21. The current collecting member is used to connect the tab 242 and the electrode terminal 22 to reduce the difficulty of connecting the tab 242 and the electrode terminal 22.

[0146] For example, the current collecting component may be made of a variety of materials. For example, the current collecting component may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0147] It should be noted that the connection structures between the current collecting member and the tab 242 and between the current collecting member and the electrode terminal 22 can be various, such as welding connection or abutment connection.

[0148] In some embodiments, see Figure 6 As shown, the battery cell 20 can also have a seal 29, which is arranged between the electrode terminal 22 and the wall 211. The seal 29 is configured to seal the gap 26 between the electrode terminal 22 and the hole wall of the mounting hole 2111 to reduce the risk of leakage of the battery cell 20 during use.

[0149] Exemplarily, the material of the seal 29 can be various. For example, the material of the seal 29 can be silica gel, rubber, plastic, etc.

[0150] Optionally, in Figure 4 and Figure 5 the battery cell 20 includes two electrode terminals 22. Both of the two electrode terminals 22 are insulated and mounted on the wall portion 211, and the two electrode terminals 22 are arranged at intervals along the first direction Y. The two electrode terminals 22 are respectively connected to the two tabs 242 of the electrode assembly 24 to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0151] Along the first direction Y, a gap 26 is formed between the main body portion 241 and the first insulating member 23. That is to say, the main body portion 241 of the electrode assembly 24 and the first insulating member 23 are structures arranged at intervals along the first direction Y, so that the space between the main body portion 241 and the first insulating member 23 in the first direction Y is the gap 26.

[0152] The tab 242 includes a first portion 2421 located in the gap 26. The first portion 2421 is connected to the main body portion 241. That is, the portion of the tab 242 located in the gap 26 in the first direction Y is the first portion 2421 of the tab 242, and this portion is connected to one end of the main body portion 241 close to the first insulating member 23 in the first direction Y. Correspondingly, the tab 242 further includes a second portion 2422 connected to the first portion 2421. The second portion 2422 is the portion of the tab 242 inserted into the interior of the first insulating member 23, so that the second portion 2422 is a structure connected to the main body portion 241 through the first portion 2421.

[0153] In the embodiment of the present application, the second insulating member 25 functions to insulate and isolate the tab 242 and the wall portion 211. The second insulating member 25 can be of various structures. For example, the second insulating member 25 can be a structure such as an insulating sheet disposed between the wall portion 211 and the tab 242. Of course, the second insulating member 25 can be an insulating tape or insulating paper adhered to the wall portion 211, or an insulating coating applied to the wall portion 211. Similarly, the material of the second insulating member 25 can also be various. For example, the material of the second insulating member 25 can be polyethylene terephthalate, polyimide, polypropylene, etc.

[0154] Wherein, it is disposed between the wall portion 211 and the tab 242 along the thickness direction X of the wall portion. That is, in the thickness direction X of the wall portion, the wall portion 211 and the tab 242 are respectively located on both sides of the second insulating member 25.

[0155] In the same plane perpendicular to the thickness direction X of the wall portion, at least a part of the orthographic projection of the first portion 2421 overlaps with the orthographic projection of the second insulating member 25. That is to say, at least a part of the projection in the thickness direction X of the wall portion of the part of the tab 242 located in the gap 26 is located within the second insulating member 25.

[0156] Exemplarily, the wall portion 211 has a first surface 2112 facing the electrode assembly 24 in the thickness direction X of the wall portion, and the second insulating member 25 is connected to the first surface 2112.

[0157] In some embodiments, the battery cell 20 may further include a pressure relief component disposed on the outer casing 21, and the pressure relief component is configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0158] Optionally, the pressure relief component may be disposed on the end cap 213 of the outer casing 21 or on the housing 212 of the outer casing 21. Similarly, the pressure relief component and the outer casing 21 may be of a split structure or an integrally formed structure. If the pressure relief component and the outer casing 21 are of a split structure, the pressure relief component may be connected to the outer casing 21 by means such as welding. Correspondingly, the pressure relief component may be components such as an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve or a safety valve; if the pressure relief component and the outer casing 21 are of an integrally formed structure, the pressure relief component is a region on the outer casing 21 where a weak structure is formed. For example, a region on the outer casing 21 where a scoring groove is provided.

[0159] In this embodiment, an electrode terminal 22 is provided on the wall portion 211, and the electrode terminal 22 is connected to the tab 242 of the electrode assembly 24 to input or output electrical energy of the battery cell 20 through the electrode terminal 22. Among them, a first insulating member 23 is provided in the outer shell 21, and at least a part of the first insulating member 23 is located between the electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion, so that the first insulating member 23 can insulate and isolate the electrode terminal 22 and the wall portion 211, which is beneficial to reducing the short-circuit risk between the wall portion 211 and the electrode terminal 22. By providing a second insulating member 25 on the side of the wall portion 211 facing the electrode assembly 24, the second insulating member 25 is located between the tab 242 and the wall portion 211 in the thickness direction X of the wall portion, and at least a part of the projection of the first part 2421 of the tab 242 located in the gap 26 between the main body portion 241 and the first insulating member 23 in the thickness direction X of the wall portion is located within the second insulating member 25, so that the second insulating member 25 can play an insulating and isolating effect between the first part 2421 of the tab 242 located in the gap 26 and the wall portion 211, thereby effectively alleviating the phenomenon that the first part 2421 of the tab 242 located in the gap 26 overlaps with the wall portion 211 during use, so as to reduce the short-circuit risk between the tab 242 and the wall portion 211, and further effectively reduce the risk of internal short circuit or fire and explosion caused by short circuit during the use of the battery cell 20, which is beneficial to improving the use reliability of the battery cell 20.

[0160] According to some embodiments of the present application, referring to Figure 6 and Figure 7 As shown, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first part 2421 as a whole is located within the orthographic projection of the second insulating member 25, that is, the projection of the first part 2421 of the first tab 242 located in the gap 26 in the thickness direction X of the wall portion is located within the second insulating member 25, that is to say, the second insulating member 25 covers the first part 2421 of the first tab 242 located in the gap 26 in the thickness direction X of the wall portion.

[0161] In this embodiment, by setting the projection of the first part 2421 of the tab 242 located in the gap 26 in the thickness direction X of the wall portion as a whole to be located within the second insulating member 25, the effect of the second insulating member 25 insulating and isolating the first part 2421 of the tab 242 and the wall portion 211 is improved, thereby further alleviating the phenomenon that the first part 2421 of the tab 242 located in the gap 26 overlaps with the wall portion 211 during use, so as to further reduce the short-circuit risk between the tab 242 and the wall portion 211, and further reduce the risk of internal short circuit or fire and explosion caused by short circuit during the use of the battery cell 20.

[0162] According to some embodiments of the present application, referring toFigure 6 As shown, in the thickness direction X of the wall portion, a part of the second insulating member 25 is located between the wall portion 211 and the first insulating member 23.

[0163] Wherein, the first insulating member 23 and the main body portion 241 of the electrode assembly 24 are arranged at intervals in the first direction Y, so that a gap 26 is located between the first insulating member 23 and the main body portion 241 of the electrode assembly 24. Correspondingly, a part of the second insulating member 25 is arranged corresponding to the gap 26, and one end of the second insulating member 25 close to the first insulating member 23 in the first direction Y extends out of the gap 26 and extends between the first insulating member 23 and the wall portion 211.

[0164] In this embodiment, by arranging a part of the second insulating member 25 between the wall portion 211 and the first insulating member 23, a part of the positive projection of the second insulating member 25 and the first insulating member 23 in the same plane perpendicular to the thickness direction X of the wall portion overlaps each other, so that a part of the second insulating member 25 overlaps with the first insulating member 23 in the thickness direction X of the wall portion. With this structure, on the one hand, the battery cell 20 can also play a certain role in clamping and fixing the second insulating member 25 through the first insulating member 23 and the wall portion 211, which is beneficial to improving the stability of the second insulating member 25 arranged in the housing 21. On the other hand, it can further improve the effect of the second insulating member 25 in separating the wall portion 211 and the first part 2421 of the tab 242, so as to further reduce the risk of short circuit between the first part 2421 of the tab 242 and the wall portion 211.

[0165] According to some embodiments of the present application, please continue to refer to Figure 6 As shown, in the thickness direction X of the wall portion, a part of the second insulating member 25 is located between the wall portion 211 and the main body portion 241.

[0166] Wherein, the first insulating member 23 and the main body portion 241 of the electrode assembly 24 are arranged at intervals in the first direction Y, so that a gap 26 is located between the first insulating member 23 and the main body portion 241 of the electrode assembly 24. Correspondingly, a part of the second insulating member 25 is arranged corresponding to the gap 26, and one end of the second insulating member 25 close to the main body portion 241 of the electrode assembly 24 in the first direction Y extends out of the gap 26 and extends between the main body portion 241 of the electrode assembly 24 and the wall portion 211.

[0167] In this embodiment, by arranging a part of the second insulating member 25 between the wall portion 211 and the main body portion 241 of the electrode assembly 24, a part of the positive projection of the second insulating member 25 and the main body portion 241 of the electrode assembly 24 in the same plane perpendicular to the thickness direction X of the wall portion overlaps with each other, so that a part of the second insulating member 25 overlaps with the main body portion 241 of the electrode assembly 24 in the thickness direction X of the wall portion. With the battery cell 20 having such a structure, on the one hand, the wall portion 211 and the main body portion 241 of the electrode assembly 24 can also play a certain role in clamping and fixing the second insulating member 25, which is beneficial to improving the stability of the second insulating member 25 disposed in the housing 21. On the other hand, it can further improve the effect of the second insulating member 25 in separating the wall portion 211 and the first portion 2421 of the tab 242, so as to further reduce the risk of short circuit between the first portion 2421 of the tab 242 and the wall portion 211.

[0168] According to some embodiments of the present application, referring to Figure 7 As shown, along the second direction Z, both ends of the second insulating member 25 respectively extend beyond both ends of the first portion 2421, and the second direction Z is perpendicular to the first direction Y and the thickness direction X of the wall portion.

[0169] Wherein, the first portion 2421 of the tab 242 has opposite first end 2421a and second end 2421b in the second direction Z, and both ends of the second insulating member 25 respectively extend beyond both ends of the first portion 2421. That is to say, one end of the second insulating member 25 in the second direction Z extends beyond the first end 2421a of the first portion 2421, and the other end of the insulating member in the second direction Z extends beyond the second end of the first portion 2421.

[0170] In this embodiment, by arranging both ends of the second insulating member 25 in the second direction Z to respectively extend beyond both ends of the first portion 2421 of the tab 242, the size of the second insulating member 25 in the second direction Z is larger than the size of the first portion 2421 of the tab 242 in the second direction Z, so that the effect of the second insulating member 25 in insulating and isolating the wall portion 211 and the first portion 2421 of the tab 242 can be further improved, which is beneficial to further reducing the risk of short circuit between the first portion 2421 of the tab 242 and the wall portion 211.

[0171] In some embodiments, along the second direction Z, the first portion 2421 has opposite first end 2421a and second end 2421b, and the size of the second insulating member 25 extending beyond the first end 2421a in the second direction Z is L1, and 5mm ≤ L1 ≤ 20mm.

[0172] Wherein, L1 is the length dimension of the part of the second insulating member 25 extending beyond the first end 2421a in the second direction Z in the second direction Z.

[0173] Exemplarily, the dimension L1 by which the second insulating member 25 extends beyond the first end 2421a in the second direction Z may be 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or the like.

[0174] In this embodiment, by setting the dimension of the portion of the second insulating member 25 that extends beyond the first end 2421a of the first portion 2421 in the second direction Z to be from 5 mm to 20 mm, on the one hand, the effect of the second insulating member 25 separating the partition portion 211 and the first portion 2421 of the tab 242 can be improved to reduce the risk of short - circuit between the first portion 2421 of the tab 242 and the wall portion 211. On the other hand, the phenomenon that the second insulating member 25 occupies too much space due to an overly large dimension beyond it can be alleviated, which is beneficial to reducing the assembly difficulty of the second insulating member 25 and can reduce the interference effect between the second insulating member 25 and other components.

[0175] In some embodiments, along the second direction Z, the first portion 2421 has opposite first and second ends 2421a and 2421b, and the dimension by which the second insulating member 25 extends beyond the second end 2421b in the second direction Z is L2, where 5 mm ≤ L2 ≤ 20 mm.

[0176] Wherein, L2 is the length dimension in the second direction Z of the portion of the second insulating member 25 that extends beyond the second end 2421b in the second direction Z.

[0177] Exemplarily, the dimension L2 by which the second insulating member 25 extends beyond the second end 2421b in the second direction Z may be 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or the like.

[0178] In this embodiment, by setting the dimension of the portion of the second insulating member 25 that extends beyond the second end 2421b of the first portion 2421 in the second direction Z to be from 5 mm to 20 mm, on the one hand, the effect of the second insulating member 25 separating the partition portion 211 and the first portion 2421 of the tab 242 can be improved to reduce the risk of short - circuit between the first portion 2421 of the tab 242 and the wall portion 211. On the other hand, the phenomenon that the second insulating member 25 occupies too much space due to an overly large dimension beyond it can be alleviated, which is beneficial to reducing the assembly difficulty of the second insulating member 25 and can reduce the interference effect between the second insulating member 25 and other components.

[0179] According to some embodiments of the present application, refer toFigure 6 As shown, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing the electrode assembly 24, and the second insulating member 25 is connected to the first surface 2112.

[0180] Among them, the first surface 2112 is the inner surface of the wall portion 211 on the side facing the electrode assembly 24 in the thickness direction X of the wall portion. The second insulating member 25 is correspondingly connected to the side of the wall portion 211 facing the electrode assembly 24. Optionally, the structure in which the second insulating member 25 is connected to the first surface 2112 can be various, such as bonding, bolt screwing, etc.

[0181] It should be noted that in the embodiment where the mounting hole 2111 for mounting the electrode terminal 22 is provided on the wall portion 211, one end of the mounting hole 2111 in the thickness direction X of the wall portion penetrates the first surface 2112.

[0182] In this embodiment, by connecting the second insulating member 25 to the first surface 2112 of the wall portion 211 facing the electrode assembly 24, on the one hand, the stability of the second insulating member 25 assembled between the wall portion 211 and the tab 242 can be improved, which is beneficial to reducing phenomena such as shaking or displacement of the second insulating member 25 during use. On the other hand, the second insulating member 25 can better partition the first part 2421 of the wall portion 211 and the tab 242, which is beneficial to improving the effect of the second insulating member 25 insulating and isolating the wall portion 211 and the first part 2421 of the tab 242.

[0183] In some embodiments, please continue to refer to Figure 6 As shown, the second insulating member 25 is bonded to the first surface 2112.

[0184] Exemplarily, the second insulating member 25 is bonded to the first surface 2112 of the wall portion 211 through an adhesive layer, and the adhesive layer can be glue, double-sided tape, hot melt adhesive, etc.

[0185] In this embodiment, by bonding the second insulating member 25 to the first surface 2112 of the wall portion 211 facing the electrode assembly 24, the structure is simple and easy to assemble, which is beneficial to reducing the difficulty of connecting the second insulating member 25 to the first surface 2112 of the wall portion 211, so as to improve the assembly efficiency of the battery cell 20.

[0186] According to some embodiments of the present application, refer to Figure 6 As shown, along the thickness direction X of the wall portion, the thickness of the second insulating member 25 is D, satisfying 10 μm ≤ D ≤ 30 μm.

[0187] Exemplarily, the thickness D of the second insulating member 25 in the thickness direction X of the wall portion may be 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, 21 microns, 22 microns, 23 microns, 24 microns, 25 microns, 26 microns, 27 microns, 28 microns, 29 microns, 30 microns, etc.

[0188] In this embodiment, the thickness of the second insulating member 25 in the thickness direction X of the wall portion is 10 microns to 30 microns. On the one hand, setting the thickness of the second insulating member 25 to be greater than or equal to 10 microns can enhance the structural strength of the second insulating member 25, which is beneficial to reducing the risk of damage or scratching of the second insulating member 25 during use or assembly, and can also enhance the effect of the second insulating member 25 insulating the partition wall portion 211 and the first portion 2421 of the tab 242, which is beneficial to alleviating the phenomenon of breakdown of the second insulating member 25, thereby reducing the short - circuit risk between the wall portion 211 and the first portion 2421 of the tab 242. On the other hand, setting the thickness of the second insulating member 25 to be less than or equal to 30 microns can reduce the space occupied by the second insulating member 25 in the thickness direction X of the wall portion, thereby improving the internal space utilization rate of the battery cell 20 and reducing the interference effect between the second insulating member 25 and the first insulating member 23 or the electrode assembly 24.

[0189] According to some embodiments of the present application, the material of the second insulating member 25 may be polyimide or polypropylene.

[0190] In this embodiment, by setting the material of the second insulating member 25 to be polyimide or polypropylene, the second insulating member 25 has good insulation performance and good heat - resistant performance, which is beneficial to alleviating phenomena such as shrinkage or melting of the second insulating member 25 during use, thereby improving the use stability of the second insulating member 25 and enhancing the stability of the second insulating member 25 insulating the partition wall portion 211 and the first portion 2421 of the tab 242.

[0191] According to some embodiments of the present application, referring to Figure 6 As shown, an insulating film 27 is coated on the outer surface of the main body portion 241, and the insulating film 27 is configured to insulate the main body portion 241 and the outer shell 21.

[0192] Exemplarily, the material of the insulating film 27 can be various, such as rubber, plastic, or silicone, etc.

[0193] It should be noted that the area where the tab 242 is connected to the outer surface of the main body portion 241 is not coated with the insulating film 27.

[0194] In this embodiment, by covering the outer surface of the main body portion 241 with the insulating film 27, the insulating film 27 can insulate and isolate the main body portion 241 of the electrode assembly 24 and the outer casing 21, which is beneficial to reducing the risk of the main body portion 241 of the electrode assembly 24 and the outer casing 21 being short-circuited due to mutual overlap, so as to improve the usage reliability of the battery cell 20.

[0195] In some embodiments, please continue to refer to Figure 6 As shown, along the first direction Y, the insulating film 27 and the first insulating member 23 are arranged at intervals, and along the thickness direction X of the wall portion, a part of the second insulating member 25 is located between the wall portion 211 and the insulating film 27.

[0196] In this embodiment, by arranging a part of the second insulating member 25 between the wall portion 211 and the insulating film 27, a part of the positive projection of the second insulating member 25 and the insulating film 27 in the same plane perpendicular to the thickness direction X of the wall portion overlaps with each other, so that a part of the second insulating member 25 overlaps with the insulating film 27 in the thickness direction X of the wall portion, thereby further enhancing the effect of the second insulating member 25 in separating the wall portion 211 and the first part 2421 of the tab 242, and further reducing the risk of short circuit between the first part 2421 of the tab 242 and the wall portion 211.

[0197] According to some embodiments of the present application, refer to Figure 6 As shown, the tab 242 further includes a second part 2422 inserted into the first insulating member 23 along the first direction Y. The second part 2422 is connected to the first part 2421, and the second part 2422 is connected to the electrode terminal 22.

[0198] Wherein, a part of the tab 242 is inserted into the first insulating member 23 along the first direction Y. Correspondingly, the second part 2422 of the tab 242 is the part of the tab 242 located within the first insulating member 23, and the part of the tab 242 projected within the gap 26 in the thickness direction X of the wall portion is the first part 2421, and the first part 2421 and the second part 2422 are structures connected to each other.

[0199] In this embodiment, the tab 242 further has a second part 2422 inserted into the first insulating member 23, and the second part 2422 is connected to the electrode terminal 22 to realize the electrical connection between the electrode terminal 22 and the electrode assembly 24. The battery cell 20 adopting this structure can also insulate and isolate the second part 2422 of the tab 242 and the outer casing 21 through the first insulating member 23, which is beneficial to reducing the short-circuit risk between the outer casing 21 and the second part 2422 of the tab 242, so as to improve the usage reliability of the battery cell 20.

[0200] According to some embodiments of the present application, refer to Figure 6, and further refer to Figure 8 , Figure 8 FIG. Figure 8 is a schematic structural view of a first insulating member 23 provided in some embodiments of the present application. An installation cavity 231 is formed inside the first insulating member 23. The installation cavity 231 penetrates through one side of the first insulating member 23 facing the main body portion 241 along the first direction Y. A part of the electrode terminal 22 is inserted into the first insulating member 23 along the thickness direction X of the wall portion and extends into the installation cavity 231. A second part 2422 is located in the installation cavity 231 and is connected to the electrode terminal 22.

[0201] Among them, the installation cavity 231 penetrates through one side of the first insulating member 23 facing the main body portion 241 along the first direction Y, that is, the installation cavity 231 is a structure that penetrates through the surface of the first insulating member 23 on the side facing the main body portion 241 in the first direction Y, so that an insertion port communicating with the installation cavity 231 is formed on one side of the first insulating member 23 facing the main body portion 241 in the first direction Y, facilitating the insertion of the second part 2422 of the tab 242 into the installation cavity 231 through the insertion port.

[0202] A part of the electrode terminal 22 is inserted into the first insulating member 23 along the thickness direction X of the wall portion and extends into the installation cavity 231, that is to say, the electrode terminal 22 is a structure inserted into the interior of the first insulating member 23 along the thickness direction X of the wall portion, and a part of the electrode terminal 22 extends into the installation cavity 231.

[0203] In this embodiment, by providing the installation cavity 231 inside the first insulating member 23, and the installation cavity 231 penetrates through one side of the first insulating member 23 facing the main body portion 241 of the electrode assembly 24 in the first direction Y, it is convenient to insert the second part 2422 of the tab 242 provided at one end of the main body portion 241 in the first direction Y into the installation cavity 231 of the first insulating member 23, which is beneficial to reducing the difficulty of inserting the second part 2422 of the tab 242 into the first insulating member 23, and can reduce the difficulty of connecting the second part 2422 of the tab 242 and the part of the electrode terminal 22 extending into the installation cavity 231, thereby reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0204] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 8As shown, the first insulating member 23 may include an insulating body 232 and a partition 233. Along the thickness direction X of the wall portion, a part of the insulating body 232 is located between the electrode terminal 22 and the wall portion 211. On the side of the insulating body 232 facing away from the wall portion 211, a receiving groove 2321 is provided. A part of the electrode terminal 22 penetrates through the bottom wall of the receiving groove 2321 and extends into the receiving groove 2321. The receiving groove 2321 penetrates through the side of the insulating body 232 facing the main body portion 241 along the first direction Y. The partition 233 is connected to the insulating body 232. The partition 233 is disposed opposite to the bottom surface of the receiving groove 2321 in the thickness direction X of the wall portion. The partition 233 and the wall surface of the receiving groove 2321 together define an installation cavity 231.

[0205] Among them, the receiving groove 2321 is provided on the side of the insulating body 232 facing away from the wall portion 211 in the thickness direction X of the wall portion, and the receiving groove 2321 penetrates through the surface of the insulating body 232 facing the main body portion 241 in the first direction Y to form an insertion opening for the tab 242 to be inserted into the installation cavity 231.

[0206] A part of the electrode terminal 22 penetrates through the bottom wall of the receiving groove 2321 and extends into the receiving groove 2321, that is, a through hole is provided on the bottom surface of the receiving groove 2321. The through hole penetrates through the bottom wall of the receiving groove 2321 along the thickness direction X of the wall portion, and the electrode terminal 22 penetrates through the through hole, and one end of the electrode terminal 22 extends into the receiving groove 2321.

[0207] The partition 233 of the first insulating member 23 is a structure connected to the insulating body 232. Figure 8 Among them, the partition 233 covers the notch of the receiving groove 2321 in the thickness direction X of the wall portion, so that the partition 233 and the bottom surface of the receiving groove 2321 are disposed opposite to each other in the thickness direction X of the wall portion, so that the surface of the partition 233 facing the bottom surface of the receiving groove 2321 and the wall surface of the receiving groove 2321 together define the installation cavity 231, so that the second part 2422 of the tab 242 is located between the partition 233 and the bottom surface of the receiving groove 2321 in the thickness direction X of the wall portion.

[0208] Optionally, the partition 233 and the insulating body 232 may be an integrally formed structure or a separately arranged structure. When the partition 233 and the insulating body 232 are separately arranged structures, the connection structure between the partition 233 and the insulating body 232 may be various, such as bonding, clamping or bolt screwing, etc.

[0209] Optionally, refer to Figure 8As shown, a plurality of cavities 2322 may be provided on the insulating body 232 of the first insulating member 23. The cavities 2322 penetrate through one side of the insulating body 232 facing the main body portion 241 of the electrode assembly 24 in the first direction Y, so as to reduce the weight of the first insulating member 23, thereby reducing the overall weight of the battery cell 20 and improving the energy density of the battery cell 20.

[0210] In this embodiment, the first insulating member 23 includes an insulating body 232 and a partition 233. A receiving groove 2321 is provided on a side of the insulating body 232 facing away from the wall portion 211. The receiving groove 2321 penetrates through one side of the insulating body 232 facing the main body portion 241 in the first direction Y, and the partition 233 is connected to the insulating body 232 and jointly defines an installation cavity 231 with the groove wall surface of the receiving groove 2321. The first insulating member 23 with this structure facilitates arranging a part of the electrode terminal 22 to extend into the installation cavity 231, and can first insert the second part 2422 of the tab 242 into the receiving groove 2321 and connect it to the electrode terminal 22, and then assemble the partition 233 and the insulating body 232 to form the installation cavity 231, thereby reducing the assembly difficulty between the tab 242 and the electrode terminal 22 and improving the manufacturing efficiency of the battery cell 20.

[0211] In some embodiments, referring to Figure 8 As shown, the partition 233 and the insulating body 232 are of an integral structure. One end of the partition 233 can rotate relative to the insulating body 232, and the other end can be snap-connected to the insulating body 232.

[0212] Among them, the partition 233 and the insulating body 232 are of an integral structure, that is, the partition 233 and the insulating body 232 are formed by an integral molding process.

[0213] One end of the partition 233 can rotate relative to the insulating body 232, and the other end can be snap-connected to the insulating body 232. That is to say, one end of the partition 233 is connected to the insulating body 232, and a weak connection structure is formed at the connection, so that the partition 233 can rotate relative to the insulating body 232 with the connection between the partition 233 and the insulating body 232 as the rotation axis, and the other end of the partition 233 can be snap-connected to the insulating body 232, thereby realizing the mutual assembly of the partition 233 and the insulating body 232.

[0214] In this embodiment, by setting the separator 233 and the insulating body 232 as an integral structure, and one end of the separator 233 can rotate relative to the insulating body 232, and the other end can be snap-connected to the insulating body 232, so that the separator 233 is connected to the insulating body 232 and jointly defines an installation cavity 231 with the wall surface of the receiving groove 2321. The first insulating member 23 with this structure is convenient for quickly disassembling and assembling the separator 233 and the insulating body 232 during subsequent use, which is beneficial to reducing the difficulty of maintaining the pole ear 242 and the electrode terminal 22, so as to reduce the subsequent maintenance cost of the battery cell 20.

[0215] Of course, the structure of the first insulating member 23 is not limited to this. In some embodiments, the first insulating member 23 can also be other structures. For example, the separator 233 and the insulating body 232 are separately provided and detachably connected.

[0216] Exemplarily, the separator 233 is snap-connected to the insulating body 232. Of course, in other embodiments, the detachable connection structure between the separator 233 and the insulating body 232 can also be other structures. For example, the separator 233 can also be detachably connected to the insulating body 232 through structures such as bolt screwing.

[0217] In this embodiment, by setting the separator 233 and the insulating body 232 as a split structure and the separator 233 and the insulating body 232 are detachably connected, it is convenient for quickly disassembling and assembling the separator 233 and the insulating body 232 during subsequent use, which is beneficial to reducing the difficulty of maintaining the pole ear 242 and the electrode terminal 22, so as to reduce the subsequent maintenance cost of the battery cell 20.

[0218] According to some embodiments of the present application, referring to Figure 4 and Figure 5 As shown, the electrode assembly 24 may include two pole ears 242 with opposite polarities, and the two pole ears 242 are respectively connected to both ends of the main body portion 241 along the first direction Y. The battery cell 20 includes two electrode terminals 22, two first insulating members 23 and two second insulating members 25. The two electrode terminals 22 are arranged at intervals along the first direction Y on the wall portion 211. The two first insulating members 23 are respectively located on both sides of the main body portion 241 in the first direction Y. The first insulating member 23 is correspondingly arranged with the electrode terminal 22. The two second insulating members 25 are arranged at intervals along the first direction Y, and each second insulating member 25 is correspondingly arranged with one pole ear 242.

[0219] Among them, the two tabs 242 of the electrode assembly 24 are respectively used for inputting or outputting the positive and negative electrodes of the electrode assembly 24, and the two tabs 242 are respectively connected to both ends of the main body portion 241 in the first direction Y. Correspondingly, the two first insulating members 23 are respectively located on both sides of the main body portion 241 in the first direction Y, and gaps 26 are formed between the main body portion 241 and the two first insulating members 23.

[0220] Each second insulating member 25 is correspondingly arranged with one tab 242, that is, one second insulating member 25 is arranged between each tab 242 and the wall portion 211, and at least a part of the projection of the first portion 2421 of each tab 242 located in the corresponding gap 26 in the thickness direction X of the wall portion is located within the corresponding second insulating member 25.

[0221] In this embodiment, the electrode assembly 24 is provided with two tabs 242, and the two tabs 242 are respectively connected to both ends of the main body portion 241 in the first direction Y. Correspondingly, the battery cell 20 further includes two electrode terminals 22, two first insulating members 23 and two second insulating members 25, and the tabs 242, the electrode terminals 22, the first insulating members 23 and the second insulating members 25 are all arranged in a one-to-one correspondence structure, so that while realizing the input or output of the positive and negative electrodes of the battery cell 20, the insulation isolation between the wall portion 211 and the two tabs 242 of the electrode assembly 24 can be realized, so as to reduce the short-circuit risk between the electrode assembly 24 and the wall portion 211, which is beneficial to improving the use reliability of the battery cell 20.

[0222] According to some embodiments of the present application, referring to Figure 3 、 Figure 4 and Figure 5 As shown, the outer shell 21 may include a housing 212 and an end cover 213. An accommodating cavity with an opening is formed inside the housing 212. The electrode assembly 24 is accommodated in the accommodating cavity, and the end cover 213 closes the opening. The end cover 213 is the wall portion 211.

[0223] Among them, the end cover 213 is the wall portion 211, that is to say, the electrode terminal 22 is arranged on the end cover 213 of the outer shell 21. Correspondingly, at least a part of the first insulating member 23 is located between the end cover 213 and the electrode terminal 22 in the thickness direction X of the wall portion. Similarly, the second insulating member 25 is arranged on the side of the end cover 213 facing the electrode assembly 24 and is located between the tab 242 and the end cover 213 in the thickness direction X of the wall portion.

[0224] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening of the housing 212, the battery cell 20 with such a structure facilitates the assembly of the electrode terminal 22 on the end cover 213 and can reduce the difficulty of the mutual assembly connection between the electrode terminal 22 and the tab 242, thereby contributing to reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0225] In some embodiments, the electrode assembly 24 is of a stacked structure, and the positive electrode sheet and the negative electrode sheet of the electrode assembly 24 are stacked in the thickness direction X of the wall portion.

[0226] In this embodiment, by setting the electrode assembly 24 as a stacked structure and stacking the positive electrode sheet and the negative electrode sheet of the electrode assembly 24 in the thickness direction X of the wall portion, on the one hand, it can reduce the manufacturing difficulty of the battery cell 20, and on the other hand, it is convenient to increase the volume of the electrode assembly 24 to achieve a battery cell 20 with a large capacitance.

[0227] In some embodiments, referring to Figure 3 and Figure 4 as shown, the end cover 213 is the wall with the largest area among the multiple walls of the outer shell 21. That is to say, the outer surface of the end cover 213 is the surface with the largest area among the multiple outer surfaces of the outer shell 21. Correspondingly, the thickness direction X of the wall portion is also the thickness direction of the battery cell 20.

[0228] In this embodiment, by setting the end cover 213 as the wall with the largest area among the multiple walls of the outer shell 21, the wall portion 211 is also the wall with the largest area among the multiple walls of the outer shell 21, so that it is convenient to set the electrode terminal 22 on the wall portion 211 and to set the second insulating member 25 between the wall portion 211 and the tab 242, which is beneficial to reducing the assembly difficulty of the battery cell 20.

[0229] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also be of other structures. For example, the outer shell 21 may include a housing 212 and an end cover 213. The housing 212 includes a side wall and a bottom wall formed integrally. 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 encloses an opening. The side wall and the bottom wall jointly define a receiving cavity. The electrode assembly 24 is received in the receiving cavity, and the end cover 213 closes the opening. The bottom wall is the wall portion 211.

[0230] Among them, the housing 212 includes a side wall and a bottom wall formed integrally, that is, the housing 212 is processed by an integral forming process, such as an integral forming process such as stamping, casting or extrusion molding. That is to say, the side wall and the bottom wall of the housing 212 are of an integral structure.

[0231] The bottom wall is the wall portion 211, that is, the wall portion 211 is a wall of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall. Correspondingly, the electrode terminal 22 is disposed on the bottom wall of the housing 212, and at least a part of the first insulating member 23 is located between the bottom wall of the housing 212 and the electrode terminal 22 in the thickness direction X of the wall. Similarly, the second insulating member 25 is disposed on the side of the bottom wall of the housing 212 facing the electrode assembly 24 and is located between the tab 242 and the bottom wall of the housing 212 in the thickness direction X of the wall.

[0232] Of course, in other embodiments, the battery cell 20 may also have other structures. For example, the side wall of the housing 212 includes the wall portion 211, that is to say, the wall portion 211 may be a wall in the side wall of the housing 212. Correspondingly, the electrode terminal 22 is disposed on the side wall of the housing 212.

[0233] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the bottom wall or the side wall of the housing 212, the wall portion 211 provided with the electrode terminal 22 can be far away from the end cap 213, so as to relieve the stress generated by the pulling or twisting of other components on the electrode terminal 22 from being transmitted to the connection position between the end cap 213 and the housing 212. Furthermore, the risk of connection failure between the end cap 213 and the housing 212 can be reduced, which is beneficial to reducing the leakage risk during the use of the battery cell 20 and improving the use stability and reliability of the battery cell 20.

[0234] According to some embodiments of the present application, the present application also provides a battery device 100, and the battery device 100 includes a plurality of battery cells 20 in any of the above solutions.

[0235] Among them, as shown in Figure 2 shown, the battery device 100 may further include a box body 10, and the battery cell 20 is accommodated in the box body 10.

[0236] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.

[0237] Optionally, the second box body 12 may be a hollow structure with one end open, and the first box body 11 may 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 jointly define an assembly space; the first box body 11 and the second box body 12 may also both 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.

[0238] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes. For example, it can be a cylinder, a cuboid, etc. Exemplarily, in Figure 2 the box body 10 is of a cuboid structure.

[0239] Exemplarily, in Figure 2 a plurality of battery cells 20 are arranged in the box body 10 of the battery device 100. The plurality of battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the plurality of battery cells 20. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the plurality of battery cells 20 is accommodated in the box body 10. Of course, the battery device 100 can also be in the form that a plurality of battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body 10.

[0240] Among them, the battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection among the plurality of battery cells 20.

[0241] It should be noted that in some embodiments, the battery device 100 may not be provided with the box body 10. The battery device 100 includes a plurality of battery cells 20, and the battery device 100 composed of the plurality of battery cells 20 can be directly assembled to the electrical device to provide electrical energy for the electrical device through the plurality of battery cells 20. That is to say, the box body 10 can be part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box body 10 can be part of the chassis structure of the vehicle 1000. For example, a part of the box body 10 can become at least a part of the floor of the vehicle 1000, or a part of the box body 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0242] According to some embodiments of the present application, the present application also provides an electrical device, which includes the battery cell 20 in any of the above solutions or the battery device 100 in any of the above solutions, and the battery cell 20 or the battery device 100 is used to provide electrical energy for the electrical device.

[0243] Among them, the electrical device can be any of the foregoing devices or systems that apply the battery cell 20 or the battery device 100.

[0244] According to some embodiments of the present application, referring to Figure 9 , Figure 9 is a cross-sectional view of the energy storage device 2000 provided in some embodiments of the present application. The present application also provides an energy storage device 2000, which includes the battery cell 20 in any of the above solutions or the battery device 100 in any of the above solutions.

[0245] Exemplarily, in Figure 9 the energy storage device 2000 includes an energy storage box body 2001 and a plurality of battery devices 100. The plurality of battery devices 100 are accommodated in the energy storage box body 2001. Of course, in other embodiments, the energy storage device 2000 may also include an energy storage box body 2001 and a plurality of battery cells 20, and the plurality of battery cells 20 are accommodated in the energy storage box body 2001.

[0246] According to some embodiments of the present application, referring to Figures 3 to 8As shown in the figure, the present application provides a battery cell 20, which includes a housing 21, two electrode terminals 22, two first insulating members 23, an electrode assembly 24, and two second insulating members 25. The housing 21 has a wall portion 211. The housing 21 includes a housing body 212 and an end cover 213. An accommodating cavity with an opening is formed inside the housing body 212. The electrode assembly 24 is accommodated in the accommodating cavity. The end cover 213 closes the opening. The end cover 213 is the wall portion 211, and the end cover 213 is the wall with the largest area among the multiple walls of the housing 21. The two electrode terminals 22 are both insulated and installed on the wall portion 211, and the two electrode terminals 22 are arranged at intervals along the first direction Y. The electrode assembly 24 is of a laminated structure. The positive electrode plate and the negative electrode plate of the electrode assembly 24 are stacked along the thickness direction X of the wall portion. The electrode assembly 24 is accommodated in the housing 21. The electrode assembly 24 includes a main body portion 241 and two tab ears 242. The polarities of the two tab ears 242 are opposite. The two tab ears 242 are respectively connected to both ends of the main body portion 241 in the first direction Y. Each tab ear 242 is connected to one electrode terminal 22. The two first insulating members 23 are both arranged inside the housing 21, and the two first insulating members 23 are respectively arranged on both sides of the main body portion 241 in the first direction Y. The first insulating members 23 are arranged in one-to-one correspondence with the electrode terminals 22. At least a part of the first insulating member 23 is located between the corresponding electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion to insulate and isolate the corresponding electrode terminal 22 and the wall portion 211. The two first insulating members 23 are both arranged at intervals from the main body portion 241 in the first direction Y, so that gaps 26 are formed between the main body portion 241 and the two first insulating members 23. The tab ears 242 are arranged in one-to-one correspondence with the first insulating members 23. The tab ear 242 includes a first portion 2421 located in the gap 26 and a second portion 2422 inserted into the corresponding first insulating member 23. The first portion 2421 is connected to one end of the main body portion 241 close to the corresponding first insulating member 23 in the first direction Y. The first portion 2421 is connected to the second portion 2422, and the second portion 2422 is connected to the electrode terminal 22. An installation cavity 231 is formed inside the first insulating member 23. The installation cavity 231 penetrates through the side of the first insulating member 23 facing the main body portion 241 along the first direction Y. A part of the electrode terminal 22 penetrates through the corresponding first insulating member 23 in the thickness direction X of the wall portion and extends into the installation cavity 231. The second portion 2422 is located in the installation cavity 231 of the corresponding first insulating member 23 and is connected to the corresponding electrode terminal 22.The first insulating member 23 includes an insulating body 232 and a partition 233. Along the thickness direction X of the wall portion, a part of the insulating body 232 is located between the electrode terminal 22 and the wall portion 211. On the side of the insulating body 232 facing away from the wall portion 211, a receiving groove 2321 is provided. A part of the electrode terminal 22 penetrates into the bottom wall of the receiving groove 2321 and extends into the receiving groove 2321. The receiving groove 2321 penetrates through the side of the insulating body 232 facing the main body portion 241 along the first direction Y. The partition 233 is connected to the insulating body 232. The partition 233 is disposed opposite to the bottom surface of the receiving groove 2321 in the thickness direction X of the wall portion. The partition 233 and the wall surface of the receiving groove 2321 jointly define an installation cavity 231. The wall portion 211 has a first surface 2112 facing the electrode assembly 24 in the thickness direction X of the wall portion. Both second insulating members 25 are bonded to the first surface 2112, and the two second insulating members 25 are spaced apart along the first direction Y. The second insulating members 25 are provided in one-to-one correspondence with the tabs 242. In the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first portion 2421 as a whole is located within the orthographic projection of the second insulating member 25. Along the thickness direction X of the wall portion, a part of the second insulating member 25 is located between the wall portion 211 and the corresponding first insulating member 23, and a part of the second insulating member 25 is located between the wall portion 211 and the main body portion 241. The outer surface of the main body portion 241 is further coated with an insulating film 27. The insulating film 27 is configured to insulate and isolate the housing 21 and the main body portion 241, and a part of the second insulating member 25 is located between the wall portion 211 and the insulating film 27 in the thickness direction X of the wall portion. Along the second direction Z, both ends of the second insulating member 25 respectively extend beyond both ends of the first portion 2421 of the corresponding tab 242. The thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other pairwise. The first portion 2421 has opposite first end 2421a and second end 2421b in the second direction Z. The dimension by which the second insulating member 25 extends beyond the first end 2421a in the second direction Z is L1, where 5 mm ≤ L1 ≤ 20 mm. The dimension by which the second insulating member 25 extends beyond the second end 2421b in the second direction Z is L2, where 5 mm ≤ L2 ≤ 20 mm. The thickness of the second insulating member 25 in the thickness direction X of the wall portion is D, satisfying 10 μm ≤ D ≤ 30 μm. The material of the second insulating member 25 can be polyimide or polypropylene.

[0247] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0248] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a wall portion; Electrode terminals disposed on the wall portion; A first insulating member disposed within the housing, at least a portion of the first insulating member being located between the electrode terminal and the wall portion in the thickness direction of the wall portion; An electrode assembly received within the housing, the electrode assembly including a main body portion and an electrode tab, the electrode tab being connected to one end of the main body portion in a first direction, the electrode tab being connected to the electrode terminal, a gap being formed between the main body portion and the first insulating member in the first direction, the electrode tab including a first portion located within the gap, the first portion being connected to the main body portion, the first direction being perpendicular to the thickness direction of the wall portion; And A second insulating member disposed between the wall portion and the electrode tab in the thickness direction of the wall portion, at least a portion of the orthographic projection of the first portion overlapping with the orthographic projection of the second insulating member in the same plane perpendicular to the thickness direction of the wall portion.

2. The battery cell according to claim 1, wherein In the same plane perpendicular to the thickness direction of the wall portion, the entire orthographic projection of the first portion is located within the orthographic projection of the second insulating member.

3. The battery cell according to claim 1, characterized in that, In the thickness direction of the wall portion, a portion of the second insulating member is located between the wall portion and the first insulating member.

4. The battery cell according to claim 1, wherein In the thickness direction of the wall portion, a portion of the second insulating member is located between the wall portion and the main body portion.

5. The battery cell according to claim 1, characterized in that, In a second direction perpendicular to the first direction and the thickness direction of the wall portion, the two ends of the second insulating member respectively extend beyond the two ends of the first portion.

6. The battery cell according to claim 5, characterized in that, In the second direction, the first portion has opposite first and second ends; Wherein, the dimension by which the second insulating member extends beyond the first end in the second direction is L1, 5 mm ≤ L1 ≤ 20 mm; and / or The dimension by which the second insulating member extends beyond the second end in the second direction is L2, 5 mm ≤ L2 ≤ 20 mm.

7. The battery cell according to claim 1, wherein In the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, and the second insulating member is connected to the first surface.

8. The battery cell according to claim 7, characterized in that The second insulating member is bonded to the first surface.

9. The battery cell according to claim 1, wherein In the thickness direction of the wall portion, the thickness of the second insulating member is D, satisfying 10 μm ≤ D ≤ 30 μm.

10. The battery cell according to claim 1, characterized in that, The material of the second insulating member is polyimide or polypropylene.

11. The battery cell according to claim 1, wherein The outer surface of the main body portion is coated with an insulating film configured to insulate and isolate the main body portion and the housing.

12. The battery cell according to claim 11, characterized in that, In the first direction, the insulating film is spaced apart from the first insulating member, and in the thickness direction of the wall portion, a portion of the second insulating member is located between the wall portion and the insulating film.

13. The battery cell according to any one of claims 1-12, characterized in that, The electrode tab further includes a second portion inserted into the first insulating member in the first direction, the second portion being connected to the first portion and the second portion being connected to the electrode terminal.

14. The battery cell according to claim 13, characterized in that, An installation cavity is formed inside the first insulating member. The installation cavity penetrates through one side of the first insulating member facing the main body portion along the first direction. A part of the electrode terminal penetrates into the first insulating member along the thickness direction of the wall portion and extends into the installation cavity, and the second part is located in the installation cavity and is connected to the electrode terminal.

15. The battery cell according to claim 14, wherein The first insulating member includes: An insulating body. Along the thickness direction of the wall portion, a part of the insulating body is located between the electrode terminal and the wall portion. A receiving groove is provided on a side of the insulating body facing away from the wall portion. A part of the electrode terminal penetrates into the bottom wall of the receiving groove and extends into the receiving groove. The receiving groove penetrates through one side of the insulating body facing the main body portion along the first direction; A separator, connected to the insulating body. The separator is disposed opposite to the bottom surface of the receiving groove in the thickness direction of the wall portion. The separator and the wall surface of the receiving groove jointly define the installation cavity.

16. The battery cell according to claim 15, characterized in that, The separator is separately provided from the insulating body and is detachably connected; or The separator and the insulating body are of an integral structure. One end of the separator can rotate relative to the insulating body, and the other end can be snap-connected to the insulating body.

17. The battery cell according to any one of claims 1-12, characterized in that, The electrode assembly includes two tab ears with opposite polarities. The two tab ears are respectively connected to two ends of the main body portion along the first direction; Wherein, the battery cell includes two electrode terminals, two first insulating members, and two second insulating members. The two electrode terminals are arranged at intervals along the first direction on the wall portion. The two first insulating members are respectively located on two sides of the main body portion in the first direction. The first insulating members are arranged corresponding to the electrode terminals. The two second insulating members are arranged at intervals along the first direction, and each second insulating member is arranged corresponding to one tab ear.

18. The battery cell according to any one of claims 1-12, characterized in that The outer shell includes a housing and an end cap. An accommodating cavity with an opening is formed inside the housing. The electrode assembly is accommodated in the accommodating cavity. The end cap closes the opening, and the end cap is the wall portion; Wherein, the electrode assembly is of a laminated structure. The positive electrode plate and the negative electrode plate of the electrode assembly are laminated along the thickness direction of the wall portion, and the end cap is the wall with the largest area among multiple walls of the outer shell.

19. A battery device, characterized in that, Including a plurality of battery cells according to any one of claims 1-18.

20. An electrical device, characterized in that, Including a battery cell according to any one of claims 1-18 or a battery device according to claim 19.

21. An energy storage device, characterized in that, Including a battery cell according to any one of claims 1-18 or a battery device according to claim 19.

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