Battery cell, battery apparatus, electrical apparatus, and energy storage apparatus

Abstract

The present application belongs to the technical field of batteries, and provides a battery cell, a battery apparatus, an electrical apparatus, and an energy storage apparatus. The battery cell comprises a casing, an electrode terminal, a first insulating member, an electrode assembly, and a second insulating member. The electrode terminal is disposed on a wall portion of the casing. 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 comprises 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. In the first direction, a gap is formed between the main body portion and the first insulating member, and the tab comprises a first portion located in the gap. The second insulating member is disposed between the wall portion and the tab. In a same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first portion at least partially overlaps with the orthographic projection of the second insulating member. Thus, the phenomenon of overlapping between the first portion of the tab and the wall portion is mitigated, which is beneficial for reducing the risk of shorting between the tab and the wall portion.

Description

Battery cell, battery device, electric device and energy storage device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202421969800X, filed on August 14, 2024, entitled “Battery cell, battery device, electric device and energy storage device,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

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

[0003] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, the battery device as a core component of new energy vehicles has higher requirements in terms of use stability and use reliability.

[0004] In the battery technology, the battery cell includes a shell and an electrode assembly arranged in the shell. In order to realize the input or output of the electric energy of the battery cell, an electrode terminal is generally insulatively installed on the shell of the battery cell, and the electrode terminal is connected with the tab of the electrode assembly, so as to realize the input or output of the electric energy of the battery cell through the electrode terminal. However, the existing battery cell is prone to the risk of tab and shell mutual lapping during use, which may cause short circuit of the battery cell, and even cause fire or explosion, thereby being not conducive to improving the use reliability of the battery cell. SUMMARY

[0005] The 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.

[0006] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell, an electrode terminal, a first insulating piece, an electrode assembly and a second insulating piece; the shell has a wall portion; the electrode terminal is arranged on the wall portion; the first insulating piece is arranged in the shell, and at least part of the first insulating piece is located between the electrode terminal and the wall portion in the thickness direction of the wall portion; the electrode assembly is accommodated in the shell, and the electrode assembly comprises 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 terminal, and a gap is formed between the main body portion and the first insulating piece in the first direction, the tab comprises a first part located in the gap, the first part is connected to the main body portion, and the first direction is perpendicular to the thickness direction of the wall portion; the second insulating piece is arranged between the wall portion and the tab in the thickness direction of the wall portion, and the orthographic projection of the first part and the orthographic projection of the second insulating piece at least partially overlap in the same plane perpendicular to the thickness direction of the wall portion.

[0007] In the above technical solution, the electrode terminal is arranged on the wall portion, and the electrode terminal and the tab of the electrode assembly are connected to each other to realize the input or output of the electric energy of the battery monomer through the electrode terminal. The first insulating piece is arranged in the shell, and at least part of the first insulating piece is located between the electrode terminal and the wall portion in the thickness direction of the wall portion, so that the first insulating piece can insulate and separate the electrode terminal and the wall portion, which is beneficial to reduce the risk of short circuit between the wall portion and the electrode terminal. The second insulating piece is arranged on the side of the wall portion facing the electrode assembly, the second insulating piece is located between the tab and the wall portion in the thickness direction of the wall portion, and at least part of the projection of the first part of the tab located in the gap between the main body portion and the first insulating piece in the thickness direction of the wall portion is located in the second insulating piece, so that the second insulating piece can insulate and separate 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 is overlapped with the wall portion during use, reducing the risk of short circuit 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 of the battery monomer during use, which is beneficial to improve the use reliability of the battery monomer.

[0008] In some embodiments, the orthographic projection of the first part is entirely located in the orthographic projection of the second insulating piece in the same plane perpendicular to the thickness direction of the wall portion.

[0009] In the technical solution, the projection of the first part of the tab in the gap in the thickness direction of the wall is entirely arranged in the second insulating member, so as to improve the effect of the second insulating member in insulating and separating the first part of the tab and the wall, thereby further relieving the mutual lapping of the first part of the tab in the gap and the wall during use, further reducing the risk of short circuit between the tab and the wall, and further reducing the risk of internal short circuit or fire and explosion caused by short circuit of the battery cell during use.

[0010] In some embodiments, along the thickness direction of the wall, the part of the second insulating member is located between the wall and the first insulating member.

[0011] In the technical solution, the part of the second insulating member is arranged between the wall and the first insulating member, so that the parts of the orthographic projection of the second insulating member and the first insulating member in the same plane perpendicular to the thickness direction of the wall overlap each other, so that the part of the second insulating member lapping with the first insulating member in the thickness direction of the wall. The battery cell with this structure can not only have a certain clamping and fixing effect on the second insulating member through the first insulating member and the wall, which is conducive to improving the stability of the second insulating member arranged in the shell, but also can further improve the effect of the second insulating member in separating the wall and the first part of the tab, thereby further reducing the risk of short circuit between the first part of the tab and the wall.

[0012] In some embodiments, along the thickness direction of the wall, the part of the second insulating member is located between the wall and the main body.

[0013] In the technical solution, the part of the second insulating member is arranged between the wall and the main body of the electrode assembly, so that the parts of the orthographic projection of the second insulating member and the main body of the electrode assembly in the same plane perpendicular to the thickness direction of the wall overlap each other, so that the part of the second insulating member lapping with the main body of the electrode assembly in the thickness direction of the wall. The battery cell with this structure can not only have a certain clamping and fixing effect on the second insulating member through the wall and the main body of the electrode assembly, which is conducive to improving the stability of the second insulating member arranged in the shell, but also can further improve the effect of the second insulating member in separating the wall and the first part of the tab, thereby further reducing the risk of short circuit between the first part of the tab and the wall.

[0014] In some embodiments, along the second direction, the two ends of the second insulating member respectively exceed the two ends of the first part, and the second direction is perpendicular to the first direction and the thickness direction of the wall.

[0015] In the technical solution, the two ends of the second insulating piece in the second direction are respectively arranged to extend out of the two ends of the first part of the tab, so that the size of the second insulating piece in the second direction is greater than the size of the first part of the tab in the second direction, thereby further improving the effect of the second insulating piece on the insulating separation wall part and the first part of the tab, and reducing the risk of short circuit between the first part of the tab and the wall part.

[0016] In some embodiments, along the second direction, the first part has opposite first and second ends; wherein the size of the second insulating piece beyond the first end in the second direction is L1, and 5mm≤L1≤20mm; and / or the size of the second insulating piece beyond the second end in the second direction is L2, and 5mm≤L2≤20mm.

[0017] In the technical solution, the size of the second insulating piece beyond the first end of the first part in the second direction is set to 5mm to 20mm, which on the one hand improves the effect of the second insulating piece on the insulating separation wall part and the first part of the tab to reduce the risk of short circuit between the first part of the tab and the wall part, and on the other hand alleviates the phenomenon of excessive space occupied by the second insulating piece due to the excessively large size of the second insulating piece, thereby reducing the assembly difficulty of the second insulating piece and reducing the interference between the second insulating piece and other components. Similarly, by setting the size of the second insulating piece beyond the second end of the first part in the second direction to 5mm to 20mm, on the one hand, the effect of the second insulating piece on the insulating separation wall part and the first part of the tab is improved to reduce the risk of short circuit between the first part of the tab and the wall part, and on the other hand, the phenomenon of excessive space occupied by the second insulating piece due to the excessively large size of the second insulating piece is alleviated, thereby reducing the assembly difficulty of the second insulating piece and reducing the interference between the second insulating piece and other components.

[0018] In some embodiments, along the thickness direction of the wall part, the wall part has a first surface facing the electrode assembly, and the second insulating piece is connected to the first surface.

[0019] In the technical solution, the second insulating piece is connected to the first surface of the wall part facing the electrode assembly, which on the one hand improves the stability of the second insulating piece assembled between the wall part and the tab, thereby reducing the phenomenon of shaking or displacement of the second insulating piece during use, and on the other hand, the second insulating piece can better separate the wall part and the first part of the tab, thereby improving the effect of the second insulating piece on the insulating separation wall part and the first part of the tab.

[0020] In some embodiments, the second insulating piece is bonded to the first surface.

[0021] In the technical solution, the second insulating piece is bonded to the first surface of the wall portion facing the electrode assembly, which is simple in structure and convenient to assemble, and helps to reduce the difficulty of connecting the second insulating piece to the first surface of the wall portion, thereby improving the assembly efficiency of the battery monomer.

[0022] In some embodiments, the thickness of the second insulating piece along the thickness direction of the wall portion is D, which satisfies 10 microns ≤ D ≤ 30 microns.

[0023] In the technical solution, the thickness of the second insulating piece along the thickness direction of the wall portion is 10 microns to 30 microns. On the one hand, the thickness of the second insulating piece is greater than or equal to 10 microns, which improves the structural strength of the second insulating piece, helps to reduce the risk of damage or tearing of the second insulating piece during use or assembly, and improves the effect of insulating and separating the wall portion and the first portion of the tab by the second insulating piece, thereby helping to alleviate the breakdown of the second insulating piece, and reducing the risk of short circuit between the wall portion and the first portion of the tab. On the other hand, the thickness of the second insulating piece is less than or equal to 30 microns, which reduces the space occupied by the second insulating piece in the thickness direction of the wall portion, thereby improving the internal space utilization of the battery monomer, and reducing the interference between the second insulating piece and the first insulating piece or the electrode assembly.

[0024] In some embodiments, the material of the second insulating piece is polyimide or polypropylene.

[0025] In the technical solution, the material of the second insulating piece is polyimide or polypropylene, which makes the second insulating piece have good insulation performance and good heat resistance, helps to alleviate the shrinkage or melting of the second insulating piece during use, thereby improving the use stability of the second insulating piece, and improving the stability of the second insulating piece in insulating and separating the wall portion and the first portion of the tab.

[0026] In some embodiments, the outer surface of the main portion is covered with an insulating film configured to insulate and separate the main portion and the shell.

[0027] In the technical solution, the outer surface of the main portion is covered with an insulating film, which can insulate and separate the main portion and the shell of the electrode assembly, helps to reduce the risk of mutual short circuit of the main portion and the shell of the electrode assembly, and improves the use reliability of the battery monomer.

[0028] In some embodiments, the insulating film and the first insulating piece are spaced apart along the first direction, and part of the second insulating piece is located between the wall portion and the insulating film along the thickness direction of the wall portion.

[0029] In the technical solution, the part of the second insulating member is located between the wall portion and the insulating film, the part of the second insulating member and the insulating film in the orthographic projection in the same plane perpendicular to the thickness direction of the wall portion overlap each other, the part of the second insulating member and the insulating film are overlapped in the thickness direction of the wall portion, the effect of the second insulating member separating the wall portion and the first part of the tab is further improved, and the risk of short circuit between the first part of the tab and the wall portion is further reduced.

[0030] In some embodiments, the tab further includes a second part inserted into the first insulating member along the first direction, the second part is connected to the first part, and the second part is connected to the electrode terminal.

[0031] In the technical solution, the tab further includes a second part inserted into the first insulating member, and the second part is connected to the electrode terminal to realize the electrical connection between the electrode terminal and the electrode assembly. The battery cell with the structure can insulate and separate the second part of the tab and the shell through the first insulating member, which is conducive to reducing the risk of short circuit between the shell and the second part of the tab and improving the use reliability of the battery cell.

[0032] In some embodiments, an installation cavity is formed in the first insulating member, the installation cavity penetrates through the side of the first insulating member facing the main body portion along the first direction, and the part of the electrode terminal is inserted 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 connected to the electrode terminal.

[0033] In the technical solution, the installation cavity is arranged in the first insulating member, and the installation cavity penetrates through the side of the first insulating member facing the main body portion of the electrode assembly along the first direction, so that the second part of the tab arranged at one end of the main body portion in the first direction is inserted into the installation cavity of the first insulating member, which is conducive to reducing the difficulty of inserting the second part of the tab into the first insulating member, and reducing the difficulty of connecting the second part of the tab and the part of the electrode terminal extending into the installation cavity, thereby reducing the assembly difficulty of the battery cell and improving the production efficiency of the battery cell.

[0034] In some embodiments, the first insulating member comprises an insulating body and a partition body; a portion of the insulating body is located between the electrode terminal and the wall portion along the thickness direction of the wall portion, a side of the insulating body facing away from the wall portion is provided with a receiving groove, a portion of the electrode terminal is arranged in the groove bottom wall of the receiving groove and extends into the receiving groove, and the receiving groove penetrates through the side of the insulating body facing the main body portion along the first direction; the partition body is connected to the insulating body, and the partition body is arranged opposite to the groove bottom surface of the receiving groove along the thickness direction of the wall portion, and the partition body and the groove wall surface of the receiving groove jointly define the mounting cavity.

[0035] In the above technical solution, the first insulating member comprises an insulating body and a partition body, a side of the insulating body facing away from the wall portion is provided with a receiving groove, the receiving groove penetrates through the side of the insulating body facing the main body portion along the first direction, and the partition body is connected to the insulating body and jointly defines the mounting cavity with the groove wall surface of the receiving groove. The first insulating member with such a structure facilitates the arrangement of the portion of the electrode terminal extending into the mounting cavity, and the second portion of the tab can be inserted into the receiving groove and connected to the electrode terminal before the partition body and the insulating body are assembled to form the mounting cavity, thereby reducing the assembly difficulty between the tab and the electrode terminal and improving the manufacturing efficiency of the battery monomer.

[0036] In some embodiments, the partition body and the insulating body are separately arranged and detachably connected, or the partition body and the insulating body are in an integrated structure, one end of the partition body can rotate relative to the insulating body, and the other end can be clamped to the insulating body.

[0037] In the above technical solution, the partition body and the insulating body are arranged in a separate structure and are detachably connected, thereby facilitating the quick disassembly of the partition body and the insulating body during subsequent use, which is conducive to reducing the difficulty of maintaining the tab and the electrode terminal and reducing the subsequent maintenance cost of the battery monomer. Similarly, the partition body and the insulating body are arranged in an integrated structure, one end of the partition body can rotate relative to the insulating body, and the other end can be clamped to the insulating body, thereby realizing the connection of the partition body to the insulating body and the joint definition of the mounting cavity with the groove wall surface of the receiving groove. The first insulating member with such a structure facilitates the quick disassembly of the partition body and the insulating body during subsequent use, which is conducive to reducing the difficulty of maintaining the tab and the electrode terminal and reducing the subsequent maintenance cost of the battery monomer.

[0038] In some embodiments, the electrode assembly includes two of the tabs with opposite polarities, and the two tabs are respectively connected to two ends of the main body in the first direction; the battery cell includes two of the electrode terminals, two of the first insulating members, and two of the second insulating members, the two electrode terminals are arranged at the wall in the first direction, the two first insulating members are respectively arranged on two sides of the main body in the first direction, the first insulating members are arranged correspondingly to the electrode terminals, and the two second insulating members are arranged in the first direction and correspond to the two tabs respectively.

[0039] In the above technical solution, the electrode assembly is provided with two tabs, and the two tabs are respectively connected to two ends of the main body in the first direction. Correspondingly, the battery cell also includes two electrode terminals, two first insulating members, and two second insulating members, and the tabs, the electrode terminals, the first insulating members, and the second insulating members are one-to-one corresponding structures. Therefore, while realizing the input or output of the positive and negative electrodes of the battery cell, the insulation isolation between the wall and the two tabs of the electrode assembly can also be realized, so as to reduce the risk of short circuit between the electrode assembly and the wall, and improve the use reliability of the battery cell.

[0040] In some embodiments, the shell includes a housing and an end cover, the housing is internally formed with a containing cavity with an opening, the electrode assembly is contained in the containing cavity, and the end cover seals the opening. The end cover is the wall. The electrode assembly is a laminated structure, and the positive and negative electrode sheets of the electrode assembly are arranged in a laminated manner along the thickness direction of the wall. The end cover is the wall with the largest area among the plurality of walls of the shell.

[0041] In the above technical solution, by setting the wall of the shell as the end cover for sealing the opening of the housing, the battery cell with this structure facilitates the assembly of the electrode terminals on the end cover, and reduces the difficulty of mutual assembly and connection between the electrode terminals and the tabs, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell. By setting the end cover as the wall with the largest area among the plurality of walls of the shell, the wall is also the wall with the largest area among the plurality of walls of the shell, thereby facilitating the arrangement of the electrode terminals on the wall and the arrangement of the second insulating members between the wall and the tabs, and reducing the assembly difficulty of the battery cell. In addition, by setting the electrode assembly as a laminated structure, and arranging the positive and negative electrode sheets of the electrode assembly in a laminated manner along the thickness direction of the wall, on the one hand, the manufacturing difficulty of the battery cell is reduced, and on the other hand, the volume of the electrode assembly is facilitated to be increased, so as to realize a battery cell with large capacity.

[0042] In a second aspect, the embodiments of the present application also provide a battery device including a plurality of the above battery cells.

[0043] In a third aspect, the embodiments of the present application further provide a power utilization device comprising the battery cell or the battery device.

[0044] In a fourth aspect, the embodiments of the present application further provide an energy storage device comprising the battery cell or the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0046] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0047] FIG. 2 is an exploded structural diagram of a battery device according to some embodiments of the present application;

[0048] FIG. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0049] FIG. 4 is an exploded structural diagram of a battery cell according to some embodiments of the present application;

[0050] FIG. 5 is a sectional view of a battery cell according to some embodiments of the present application;

[0051] FIG. 6 is a partial enlarged view of A in the battery cell shown in FIG. 5;

[0052] FIG. 7 is a front view of an electrode assembly and a wall portion in the thickness direction of the wall portion after they are assembled according to some embodiments of the present application;

[0053] FIG. 8 is a structural schematic diagram of a first insulating member according to some embodiments of the present application;

[0054] FIG. 9 is a sectional view of an energy storage device according to some embodiments of the present application.

[0055] Icon: 1000 - vehicle; 100 - battery device; 10 - case; 11 - first case body; 12 - second case body; 20 - battery cell; 21 - outer case; 211 - wall portion; 2111 - mounting hole; 2112 - first surface; 212 - housing; 213 - end cover; 22 - electrode terminal; 23 - first insulating member; 231 - mounting cavity; 232 - insulating body; 2321 - accommodating groove; 2322 - cavity; 233 - partition; 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 - sealing member; 200 - controller; 300 - motor; 2000 - energy storage device; 2001 - energy storage case; X - thickness direction of wall portion; Y - first direction; Z - second direction. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0058] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0059] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0061] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0062] "Multiple" appearing in the present application means two or more (including two).

[0063] 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.

[0064] 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0065] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0067] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0069] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. As an example of the lithium-containing phosphate, at least one of lithium iron phosphate (such as LiFeP04(also referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon can be included, but is not limited thereto. As an example of the lithium transition metal oxide, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), 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 simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and modified compounds thereof, etc.

[0070] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

[0071] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0072] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0074] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0076] 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.

[0077] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0078] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0079] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers 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 surface of the positive and negative electrodes.

[0080] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0081] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0082] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0083] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, butanedisulfone, 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0084] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0085] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0086] 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.

[0087] As an example, the inorganic solid electrolyte can include one or more of oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), halide solid electrolyte, nitride solid electrolyte, and hydride solid electrolyte.

[0088] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0089] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0090] In some embodiments, the electrode assembly is in a stack structure.

[0091] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately and stacked.

[0092] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0093] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments which are stacked.

[0094] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0095] As an example, the separators can be continuously provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0096] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0097] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0098] 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.

[0099] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, the prismatic battery cell including, but not limited to, a square cell, a blade cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc.

[0100] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0101] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0102] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies housed in the box.

[0103] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the box by fixing the battery module in the box.

[0104] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells in the box.

[0105] As an example, the box can include a first box body and a second box body. The first box body and the second box body are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0106] As an example, the box can 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 an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0107] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0108] The energy storage device mentioned in the embodiments of the present application includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices connected in series through a busbar component to improve 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 improve the capacity of the energy storage device.

[0109] The energy storage device can be used in energy storage power stations, wind power systems, solar power 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 the appropriate time. For example, the energy storage device can store electrical energy during the off-peak period of electricity consumption, and provide electrical energy for related users or electrical equipment during the peak period of electricity consumption. The energy storage system provided by the embodiments of the present application can be any power system that needs to use an energy storage device.

[0110] In some embodiments, the energy storage device includes a cabinet, and at least one side of the cabinet is provided with a door. The energy storage device is an energy storage container or an energy storage cabinet.

[0111] In some embodiments, the energy storage device can include a cabinet and one or more battery clusters, and the battery clusters are contained in the cabinet.

[0112] The battery device has the advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate. In addition, the safety of the battery device also needs to be considered.

[0113] For a general battery monomer, the battery monomer includes a shell and an electrode assembly contained in the shell, and the electrode assembly includes a main body and a tab connected to the main body. In order to realize the input or output of the electrical energy of the battery monomer, and to reduce the phenomenon of the shell being electrified, an electrode terminal is usually insulatively installed on the shell, and the electrode terminal is connected with the tab of the electrode assembly, so as to realize the input or output of the electrical energy of the battery monomer through the electrode terminal, and to alleviate the phenomenon of the shell of the battery monomer being electrified during use. However, in the battery monomer with such a structure, since the tab is relatively long, especially in a relatively long battery monomer, and the tab and the electrode terminal are located on different sides of the main body, the tab and the wall of the shell provided with the electrode terminal are easily overlapped with each other during use of the battery monomer, so that the battery monomer is prone to the risk of internal short circuit, and even the risk of fire or explosion of the battery monomer is caused, thereby being not conducive to improving the use reliability of the battery monomer.

[0114] In view of the above, in order to solve the problem of low reliability of the battery cell in use, the battery cell provided in the embodiments of the present application includes a shell, an electrode terminal, a first insulating member, an electrode assembly and a second insulating member. The shell has a wall portion. The electrode terminal is arranged on the wall portion. The first insulating member is arranged in the shell, and at least 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 in the shell, 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, the tab is connected to the electrode terminal, and a gap is formed between the main body portion and the first insulating member in 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, and the first direction is perpendicular to the thickness direction of the wall portion. The second insulating member is arranged between the wall portion and the tab in the thickness direction of the wall portion, and the orthographic projection of the first portion overlaps at least part of the orthographic projection of the second insulating member in the same plane perpendicular to the thickness direction of the wall portion.

[0115] In the battery cell with the above structure, the electrode terminal is arranged on the wall portion, and the electrode terminal and the tab of the electrode assembly are connected to each other to realize the input or output of the electric energy of the battery cell through the electrode terminal. The first insulating member is arranged in the shell, and at least 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 separate the electrode terminal and the wall portion, which is conducive to reducing the risk of short circuit between the wall portion and the electrode terminal. The second insulating member is arranged 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 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 in the second insulating member, so that the second insulating member can play an insulating and separating 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 is overlapped with the wall portion in use, reducing the risk of short circuit between the tab and the wall portion, and further effectively reducing the risk of internal short circuit or fire explosion caused by short circuit of the battery cell in use, thereby improving the reliability of the battery cell in use.

[0116] The battery cell disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, etc. The power supply system of the electric device can be composed of the battery cell and the battery device disclosed in the present application. In this way, the problem of internal short circuit or fire explosion of the battery cell in use can be alleviated, and the reliability of the battery cell in use can be improved.

[0117] The embodiments of the present application provide a power consumption device using a battery monomer or a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0118] The following embodiments are described by taking a power consumption device as a vehicle as an example for convenience of description.

[0119] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100. The battery device 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power for the vehicle 1000, for example, the battery device 100 can be used as an operating power supply or a use power supply of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power for the motor 300, for example, to meet the power consumption demand of the vehicle 1000 during starting, navigation and driving.

[0120] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply or a use power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0121] Please refer to FIG. 2 and FIG. 3. FIG. 2 is an exploded structural diagram of the battery device 100 provided by some embodiments of the present application. FIG. 3 is a structural schematic diagram of a battery monomer 20 provided by some embodiments of the present application. The battery device 100 includes a box 10 and the battery monomer 20. The battery monomer 20 is used to be accommodated in the box 10.

[0122] The box 10 is configured to provide an assembling space for the battery cell 20. The box 10 can have various structures. In some embodiments, the box 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are coupled to each other to define an assembling space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate structure. The first box body 11 is coupled to the open end of the second box body 12 to define the assembling space together with the second box body 12. Alternatively, the first box body 11 and the second box body 12 can both be hollow structures with one end open. The open end of the first box body 11 is coupled to the open end of the second box body 12.

[0123] The box 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, a square, etc. For example, as shown in FIG. 2, the box 10 has a cuboid shape.

[0124] In the battery device 100, the battery cell 20 disposed in the box 10 can be one or a plurality of battery cells. When the battery cell 20 disposed in the box 10 is a plurality of battery cells, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 20 can be accommodated in the box 10. Alternatively, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10.

[0125] In some embodiments, the battery device 100 can further include other structures. For example, the battery device 100 can further include a busbar component configured to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

[0126] Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cuboid, a cylinder, a prism, or other shapes, etc. For example, as shown in FIG. 3, the battery cell 20 has a cuboid shape.

[0127] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, FIG. 5, FIG. 6 and FIG. 7, FIG. 4 is an exploded view of a battery cell 20 according to some embodiments of the present application, FIG. 5 is a sectional view of the battery cell 20 according to some embodiments of the present application, FIG. 6 is an enlarged view of portion A of the battery cell 20 shown in FIG. 5, and FIG. 7 is a front view of the electrode assembly 24 and the wall portion 211 in the thickness direction X of the wall portion after they are assembled together according to 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 in the housing 21, and at least a portion 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, and the electrode assembly 24 includes a main body portion 241 and a tab 242, the tab 242 being connected to one end of the main body portion 241 in a first direction Y, the tab 242 being connected to the electrode terminal 22, and a gap 26 being formed between the main body portion 241 and the first insulating member 23 in the first direction Y, the tab 242 including a first portion 2421 located in the gap 26, the first portion 2421 being connected to the main body portion 241 of the electrode assembly 24, and the first direction Y being 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 in the thickness direction X of the wall portion, and a projection of the first portion 2421 and a projection of the second insulating member 25 overlap at least partially in the same plane perpendicular to the thickness direction X of the wall portion.

[0128] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms, such as a cylinder or a cuboid, etc. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0129] In some embodiments, the housing 21 can include a shell 212 and an end cover 213, the shell 212 having an accommodation cavity formed inside for accommodating the electrode assembly 24, and the accommodation cavity having an opening, that is, the shell 212 is a hollow structure with an opening at one end, and the end cover 213 is sealed to the opening of the shell 212 to form a sealed space for accommodating the electrode assembly 24 and the electrolyte.

[0130] It should be noted that the wall portion 211 for mounting the electrode terminal 22 can be an end cover 213 of the shell 21, or can be a wall of the shell body 212 of the shell 21. Exemplarily, as shown in FIGS. 3 and 4, the wall portion 211 is the end cover 213. Of course, the structure of the battery monomer 20 is not limited thereto, and in other embodiments, the wall portion 211 can also be a bottom wall opposite to the end cover 213 of the shell body 212, and the wall portion 211 can also be a side wall adjacent to and connected with the end cover 213 of the shell body 212.

[0131] In assembling the battery monomer 20, the electrode assembly 24 can be first placed into the shell body 212, and then the electrolyte is filled into the shell body 212, and then the end cover 213 is covered on the opening of the shell body 212 to complete the assembly of the battery monomer 20. Of course, in some embodiments, the electrode assembly 24 can be first placed into the shell body 212, and then the end cover 213 is covered on the opening of the shell body 212, and then the electrolyte is filled into the shell body 212 through the liquid injection hole of the shell 21 to complete the assembly of the battery monomer 20.

[0132] The shell body 212 can have various shapes, such as a cylindrical structure, a cuboid structure, or a prism structure, etc. The shape of the shell body 212 can be determined according to the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 is a cylindrical structure, a cylindrical shell body 212 can be selected; if the electrode assembly 24 is a cuboid structure, a cuboid shell body 212 can be selected. Of course, the structure of the end cover 213 can also be various, such as a plate structure or a hollow structure with one end open, etc. Exemplarily, in FIG. 3, the shell body 212 is in a cuboid shape.

[0133] Of course, it can be understood that the shell 21 is not limited to the above structure, and the shell 21 can also have other structures, such as the shell 21 can include a shell body 212 and two end covers 213, the shell body 212 is a hollow structure with openings on opposite sides, and one end cover 213 corresponds to cover and form a sealed connection on one opening of the shell body 212 to form a sealed space for accommodating the electrode assembly 24 and the electrolyte, that is, the shell body 212 forms openings on opposite sides, and the two end covers 213 cover the two sides of the shell body 212 to close the corresponding openings.

[0134] It should be noted that the electrode assembly 24 is a component in which an electrochemical reaction occurs in the battery monomer 20, and the structure of the electrode assembly 24 can be various, such as the electrode assembly 24 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or can be a laminated structure formed by laminating the positive electrode sheet, the separator, and the negative electrode sheet.

[0135] Exemplarily, in the embodiment of the present application, the electrode assembly 24 is a laminated structure formed by the positive electrode sheet, the separator and the negative electrode sheet through laminated arrangement, and the positive electrode sheet, the separator and the negative electrode sheet are arranged in the thickness direction X of the wall portion.

[0136] Exemplarily, the separator is a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0137] The electrode assembly 24 includes a main body portion 241 and a tab 242. The main body portion 241 is a main part of the electrode assembly 24 that undergoes electrochemical reaction in the battery monomer 20. Exemplarily, in FIGS. 4 and 5, the electrode assembly 24 includes two tabs 242 with opposite polarities, and the two tabs 242 output or input the positive and negative electrodes of the electrode assembly 24, respectively, and are connected to the two 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. Exemplarily, the first direction Y is the length direction of the battery monomer 20, the second direction Z is the width direction of the battery monomer 20, and the thickness direction X of the wall portion is the thickness direction of the battery monomer 20. Of course, in other embodiments, the two tabs 242 can be arranged at the same end of the main body portion 241 in the first direction Y, or can be arranged at the same side of the main body portion 241 facing the wall portion 211, or can be arranged at both ends or the same end of the main body portion 241 in the first direction Y.

[0138] Optionally, referring to FIG. 6, in some embodiments, the outer surface of the main body portion 241 of the electrode assembly 24 is further coated with an insulating film 27. The insulating film 27 is configured to insulate the main body portion 241 and the outer shell 21, so as to reduce the risk of short circuit between the main body portion 241 and the outer shell 21.

[0139] It should be noted that the tab 242 of the electrode assembly 24 is a component formed by the mutual laminated connection of the regions on the positive electrode sheet that are not coated with the positive electrode active material layer, or a component formed by the mutual laminated connection of the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. If the tab 242 is used to output the positive electrode of the electrode assembly 24, the tab 242 is a component formed by the mutual laminated connection of the regions on the positive electrode sheet that are not coated with the positive electrode active material layer. If the tab 242 is used to output the negative electrode of the electrode assembly 24, the tab 242 is a component formed by the mutual laminated connection of the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0140] Optionally, the electrode assembly 24 accommodated in the outer shell 21 can be one or multiple. Exemplarily, in FIG. 4, the outer shell 21 of the battery monomer 20 is provided with one electrode assembly 24. Of course, in other embodiments, the number of the electrode assemblies 24 arranged in the outer shell 21 can also be two, three, four, five or six, etc.

[0141] In the embodiment of the present application, the electrode terminal 22 is connected with the tab 242 of the electrode assembly 24, so that the electrode terminal 22 functions to electrically connect the electrode assembly 24 as an output pole or an input pole of the battery cell 20, thereby being capable of outputting or inputting the electric energy of the battery cell 20.

[0142] 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.

[0143] It should be noted that the electrode terminal 22 is insulatedly installed on the wall portion 211, that is, the electrode terminal 22 is not electrically connected with the wall portion 211 of the shell 21, and exemplarily, referring to FIG. 4 and FIG. 6, the shell 21 of the battery cell 20 is provided with a first insulating member 23, at least 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 separate the wall portion 211 and the electrode terminal 22, and correspondingly, the battery cell 20 can also include a third insulating member 28, the third insulating member 28 is arranged on the side of the wall portion 211 away from the electrode assembly 24 in the thickness direction X of the wall portion, and at least 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, so as to insulate and separate the electrode terminal 22 and the wall portion 211, thereby realizing the insulated installation 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.

[0144] Exemplarily, the material of the first insulating member 23 and the third insulating member 28 can also be various, for example, the material of the first insulating member 23 and the third insulating member 28 can be silicone, rubber or plastic, etc.

[0145] In FIG. 6, the wall portion 211 is provided with a mounting hole 2111 penetrating through the wall portion 211 along the thickness direction X of the wall portion, and the electrode terminal 22 is arranged in the mounting hole 2111 along the thickness direction X of the wall portion, so that part of the electrode terminal 22 extends into the shell 21 to connect the electrode terminal 22 with the tab 242, and part of the electrode terminal 22 is located outside the shell 21 to connect the electrode terminal 22 with the busbar. In the embodiment, the electrode terminal 22 includes a base, a pole and a riveting block, the base is located on the side of the wall portion 211 facing the electrode assembly 24 along the thickness direction X of the wall portion, the riveting block is located on the side of the wall portion 211 away from the electrode assembly 24, and the pole is arranged in the mounting hole 2111, one end of the pole is connected with the base, and the riveting block is connected with the part of the pole extending out of the side of the wall portion 211 away from the electrode assembly 24, so as to rivet the electrode terminal 22 on the wall portion 211. It should be noted that the number of the poles of the electrode terminal 22 can be one or multiple, and when the electrode terminal 22 is provided with multiple poles, the wall portion 211 is provided with multiple mounting holes 2111, each mounting hole 2111 is arranged for one pole, and the multiple poles are connected between the base and the riveting block.

[0146] Optionally, the connection structure between the tab 242 and the electrode terminal 22 can be various, and the tab 242 and the electrode terminal 22 can be directly connected, such as welding connection or abutting, and so on. For example, in FIG. 6, the tab 242 is directly connected with the base of the electrode terminal 22. Of course, the tab 242 and the electrode terminal 22 can also be indirectly connected, for example, in other embodiments, the battery monomer 20 can further include a current collecting member arranged in the shell 21, and the current collecting member is used to connect the tab 242 and the electrode terminal 22, so as to reduce the connection difficulty between the tab 242 and the electrode terminal 22.

[0147] For example, the material of the current collecting member can be various, such as copper, iron, aluminum, steel or aluminum alloy, and so on.

[0148] It should be noted that the connection structure 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 abutting, and so on.

[0149] In some embodiments, referring to FIG. 6, the battery monomer 20 can further include a sealing member 29 arranged between the electrode terminal 22 and the wall portion 211, and the sealing member 29 is configured to seal the gap 26 between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, so as to reduce the risk of leakage of the battery monomer 20 in use.

[0150] Exemplarily, the material of the sealing member 29 can be various, for example, the material of the sealing member 29 can be silica gel, rubber or plastic, etc.

[0151] Optionally, in FIG. 4 and FIG. 5, the battery monomer 20 includes two electrode terminals 22, both of which are insulatively mounted on the wall portion 211 and are arranged at intervals along the first direction Y, and both of which are connected with two tabs 242 of the electrode assembly 24 to realize the input or output of the positive and negative electrodes of the battery monomer 20.

[0152] Along the first direction Y, a gap 26 is formed between the main body portion 241 and the first insulating member 23, that is, the main body portion 241 and the first insulating member 23 are arranged at intervals along the first direction Y, so that the space between the main body portion 241 and the first insulating member 23 along the first direction Y is the gap 26.

[0153] The tab 242 includes a first portion 2421 located in the gap 26, and the first portion 2421 is connected to the main body portion 241, that is, the part of the tab 242 located in the gap 26 along the first direction Y is the first portion 2421 of the tab 242, and this part is connected to one end of the main body portion 241 close to the first insulating member 23 along the first direction Y. Correspondingly, the tab 242 also includes a second portion 2422 connected to the first portion 2421, and the second portion 2422 is the part of the tab 242 inserted into the inside 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.

[0154] In the embodiment of the present application, the second insulating member 25 plays a role of insulating and isolating the tab 242 and the wall portion 211, and the second insulating member 25 can be various structures, for example, the second insulating member 25 can be an insulating sheet arranged between the wall portion 211 and the tab 242, of course, the second insulating member 25 can be an insulating tape or an insulating adhesive tape, etc. adhered to the wall portion 211, or an insulating coating, etc. coated on 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 or polypropylene, etc.

[0155] Among them, it is arranged between the wall portion 211 and the tab 242 along the thickness direction X of the wall portion, that is, along the thickness direction X of the wall portion, the wall portion 211 and the tab 242 are located on both sides of the second insulating member 25.

[0156] In the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first portion 2421 overlaps at least part of the orthographic projection of the second insulating member 25, that is, at least part of the projection of the portion of the tab 242 located in the gap 26 in the thickness direction X of the wall portion is located in the second insulating member 25.

[0157] 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.

[0158] In some embodiments, the battery cell 20 can further include a pressure relief component disposed on the outer shell 21, the pressure relief component being 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.

[0159] Optionally, the pressure relief component can be disposed on the end cover 213 of the outer shell 21 or on the shell body 212 of the outer shell 21. Similarly, the pressure relief component and the outer shell 21 can be a structure disposed separately or a structure formed integrally. If the pressure relief component and the outer shell 21 are a structure disposed separately, the pressure relief component can be connected to the outer shell 21 by welding or the like, and correspondingly, the pressure relief component can be a component such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve, or a safety valve. If the pressure relief component and the outer shell 21 are a structure formed integrally, the pressure relief component is a region of the outer shell 21 in which a weak structure is formed, for example, a region in which a notch groove is provided on the outer shell 21.

[0160] In the embodiment, the electrode terminal 22 is arranged on the wall portion 211, and the electrode terminal 22 and the tab 242 of the electrode assembly 24 are connected to each other to realize input or output of electric energy of the battery monomer 20 through the electrode terminal 22, wherein the first insulating member 23 is arranged in the shell 21, and at least 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 reduce the risk of short circuit between the wall portion 211 and the electrode terminal 22. By arranging the 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 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 in 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 is overlapped with the wall portion 211 during use, to reduce the risk of short circuit between the tab 242 and the wall portion 211, thereby effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit of the battery monomer 20 during use, and is beneficial to improve the use reliability of the battery monomer 20.

[0161] According to some embodiments of the present application, referring to FIGS. 6 and 7, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first part 2421 is located in 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 in the second insulating member 25, that is, 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.

[0162] In the embodiment, by arranging 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 in 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 is overlapped with the wall portion 211 during use, to further reduce the risk of short circuit between the tab 242 and the wall portion 211, thereby further reducing the risk of internal short circuit or fire and explosion caused by short circuit of the battery monomer 20 during use.

[0163] According to some embodiments of the present application, referring to FIG. 6, along the thickness direction X of the wall portion, the portion of the second insulating member 25 is located between the wall portion 211 and the first insulating member 23.

[0164] The first insulating member 23 and the main body portion 241 of the electrode assembly 24 are arranged in a spaced manner along the first direction Y, so that the gap 26 is located between the first insulating member 23 and the main body portion 241 of the electrode assembly 24. Correspondingly, the portion of the second insulating member 25 is arranged corresponding to the gap 26, and the end of the second insulating member 25 close to the main body portion 241 of the electrode assembly 24 extends out of the gap 26 and extends between the main body portion 241 of the electrode assembly 24 and the wall portion 211 in the first direction Y.

[0165] In the present embodiment, by arranging the portion of the second insulating member 25 between the wall portion 211 and the first insulating member 23, the portions of the second insulating member 25 and the first insulating member 23 in the orthogonal projection in the same plane perpendicular to the thickness direction X of the wall portion overlap each other, so that the portion of the second insulating member 25 overlaps the first insulating member 23 in the thickness direction X of the wall portion. The battery monomer 20 adopting such a structure can not only clamp and fix the second insulating member 25 through the first insulating member 23 and the wall portion 211, but also improve the stability of the second insulating member 25 arranged in the shell 21, and further improve the effect of the second insulating member 25 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.

[0166] According to some embodiments of the present application, referring to FIG. 6, along the thickness direction X of the wall portion, the portion of the second insulating member 25 is located between the wall portion 211 and the main body portion 241 of the electrode assembly 24.

[0167] The first insulating member 23 and the main body portion 241 of the electrode assembly 24 are arranged in a spaced manner along the first direction Y, so that the gap 26 is located between the first insulating member 23 and the main body portion 241 of the electrode assembly 24. Correspondingly, the portion of the second insulating member 25 is arranged corresponding to the gap 26, and the end of the second insulating member 25 close to the main body portion 241 of the electrode assembly 24 extends out of the gap 26 and extends between the main body portion 241 of the electrode assembly 24 and the wall portion 211 in the first direction Y.

[0168] In the present embodiment, by arranging the portion of the second insulating member 25 between the wall portion 211 and the main body portion 241 of the electrode assembly 24 such that the portion of the second insulating member 25 and the main body portion 241 of the electrode assembly 24 in the orthographic projection in the same plane perpendicular to the thickness direction X of the wall portion overlap each other, and the portion of the second insulating member 25 overlaps the main body portion 241 of the electrode assembly 24 in the thickness direction X of the wall portion, the battery cell 20 adopting such a structure can on one hand still clamp and fix the second insulating member 25 through the wall portion 211 and the main body portion 241 of the electrode assembly 24, which is conducive to improving the stability of the second insulating member 25 arranged in the case 21, and on the other hand can further improve the effect of the second insulating member 25 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.

[0169] According to some embodiments of the present application, as shown in FIG. 7, along the second direction Z, the two ends of the second insulating member 25 respectively extend beyond the two 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.

[0170] The first portion 2421 of the tab 242 has opposite first and second ends 2421a and 2421b in the second direction Z, and the two ends of the second insulating member 25 respectively extend beyond the two ends of the first portion 2421, that is, one end of the second insulating member 25 extends beyond the first end 2421a of the first portion 2421 in the second direction Z, and the other end of the second insulating member 25 extends beyond the second end 2421b of the first portion 2421 in the second direction Z.

[0171] In the present embodiment, by arranging the two ends of the second insulating member 25 in the second direction Z to extend beyond the two ends of the first portion 2421 of the tab 242, the size of the second insulating member 25 in the second direction Z is greater than the size of the first portion 2421 of the tab 242 in the second direction Z, so as to further improve the effect of the second insulating member 25 insulating and separating the wall portion 211 and the first portion 2421 of the tab 242, and to further reduce the risk of short circuit between the first portion 2421 of the tab 242 and the wall portion 211.

[0172] In some embodiments, along the second direction Z, the first portion 2421 has opposite first and second ends 2421a and 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.

[0173] L1 is the length dimension of the portion of the second insulating member 25 extending beyond the first end 2421a in the second direction Z in the second direction Z.

[0174] Exemplarily, the size L1 of the second insulation member 25 exceeding the first end 2421a in the second direction Z can be 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0175] In the embodiment, by setting the size of the part of the second insulation member 25 exceeding the first end 2421a of the first part 2421 in the second direction Z to 5mm to 20mm, on the one hand, the effect of the second insulation member 25 separating the wall part 211 and the first part 2421 of the tab 242 can be improved, so as to reduce the risk of short circuit between the first part 2421 of the tab 242 and the wall part 211, on the other hand, the phenomenon that the size of the second insulation member 25 exceeding is too large to cause the second insulation member 25 to occupy too much space can be alleviated, which is beneficial to reduce the assembly difficulty of the second insulation member 25, and can reduce the interference between the second insulation member 25 and other components.

[0176] In some embodiments, along the second direction Z, the first part 2421 has opposite first and second ends 2421a and 2421b, and the size of the second insulation member 25 exceeding the second end 2421b in the second direction Z is L2, 5mm≤L2≤20mm.

[0177] Wherein, L2 is the length dimension of the part of the second insulation member 25 exceeding the second end 2421b in the second direction Z in the second direction Z.

[0178] Exemplarily, the size L2 of the second insulation member 25 exceeding the second end 2421b in the second direction Z can be 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0179] In the embodiment, by setting the size of the part of the second insulation member 25 exceeding the second end 2421b of the first part 2421 in the second direction Z to 5mm to 20mm, on the one hand, the effect of the second insulation member 25 separating the wall part 211 and the first part 2421 of the tab 242 can be improved, so as to reduce the risk of short circuit between the first part 2421 of the tab 242 and the wall part 211, on the other hand, the phenomenon that the size of the second insulation member 25 exceeding is too large to cause the second insulation member 25 to occupy too much space can be alleviated, which is beneficial to reduce the assembly difficulty of the second insulation member 25, and can reduce the interference between the second insulation member 25 and other components.

[0180] According to some embodiments of the present application, referring to FIG. 6, 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.

[0181] The first surface 2112 is an inner surface of the wall portion 211 on the side facing the electrode assembly 24 in the thickness direction X of the wall portion, and the second insulating member 25 is connected to the side of the wall portion 211 facing the electrode assembly 24. Optionally, the structure for connecting the second insulating member 25 to the first surface 2112 can be various, such as bonding, bolting, etc.

[0182] It should be noted that in the embodiment in which the wall portion 211 is provided with the mounting hole 2111 for mounting the electrode terminal 22, one end of the mounting hole 2111 in the thickness direction X of the wall portion penetrates the first surface 2112.

[0183] In the present 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 reduce the phenomenon of shaking or displacement of the second insulating member 25 during use, and on the other hand, the second insulating member 25 can better separate the wall portion 211 and the first part 2421 of the tab 242, which is beneficial to improve the effect of the second insulating member 25 insulating and separating the wall portion 211 and the first part 2421 of the tab 242.

[0184] In some embodiments, referring to FIG. 6, the second insulating member 25 is bonded to the first surface 2112.

[0185] For example, the second insulating member 25 is bonded to the first surface 2112 of the wall portion 211 through a bonding layer, which can be glue, double-sided tape or hot melt adhesive, etc.

[0186] In the present 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 reduce 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 monomer 20.

[0187] According to some embodiments of the present application, referring to FIG. 6, along the thickness direction X of the wall portion, the thickness of the second insulating member 25 is D, which satisfies 10 microns≤D≤30 microns.

[0188] Exemplarily, the thickness D of the second insulating member 25 in the thickness direction X of the wall portion can 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, or 30 microns, etc.

[0189] In the 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 one hand, the thickness of the second insulating member 25 is set to be greater than or equal to 10 microns to improve the structural strength of the second insulating member 25, which is conducive to reducing the risk of damage or tearing of the second insulating member 25 during use or assembly, and can improve the effect of the insulating separation wall portion 211 and the first portion 2421 of the tab 242 of the second insulating member 25, which is conducive to alleviating the breakdown of the second insulating member 25, thereby reducing the risk of short circuit between the wall portion 211 and the first portion 2421 of the tab 242. On the other hand, the thickness of the second insulating member 25 is set to be less than or equal to 30 microns to 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 monomer 20 and reducing the interference between the second insulating member 25 and the first insulating member 23 or the electrode assembly 24.

[0190] According to some embodiments of the present application, the material of the second insulating member 25 can be polyimide or polypropylene.

[0191] In the 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 while also having good heat resistance, which is conducive to alleviating the shrinkage or melting of the second insulating member 25 during use, thereby improving the use stability of the second insulating member 25 to improve the stability of the insulating separation wall portion 211 and the first portion 2421 of the tab 242 of the second insulating member 25.

[0192] According to some embodiments of the present application, referring to FIG. 6, the outer surface of the main body portion 241 is covered with an insulating film 27, which is configured to insulate and separate the main body portion 241 and the shell 21.

[0193] Exemplarily, the material of the insulating film 27 can be various, such as rubber, plastic, or silicone, etc.

[0194] It should be noted that the area of the outer surface of the main body portion 241 connected with the tab 242 is not covered with the insulating film 27.

[0195] In the embodiment, the insulating film 27 is coated on the outer surface of the body part 241, so that the insulating film 27 can insulate and separate the body part 241 of the electrode assembly 24 and the shell 21, which is conducive to reducing the risk of short circuit between the body part 241 of the electrode assembly 24 and the shell 21, so as to improve the use reliability of the battery monomer 20.

[0196] In some embodiments, as shown in FIG. 6, along the first direction Y, the insulating film 27 is spaced apart from the first insulating part 23, and along the thickness direction X of the wall part, part of the second insulating part 25 is located between the wall part 211 and the insulating film 27.

[0197] In the embodiment, by arranging part of the second insulating part 25 between the wall part 211 and the insulating film 27, the part of the second insulating part 25 and the insulating film 27 in the same plane perpendicular to the thickness direction X of the wall part are overlapped with each other, so that the part of the second insulating part 25 is overlapped with the insulating film 27 in the thickness direction X of the wall part, thereby further improving the effect of the second insulating part 25 separating the wall part 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 part 211.

[0198] According to some embodiments of the present application, as shown in FIG. 6, the tab 242 further includes a second part 2422 inserted into the first insulating part 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.

[0199] Part of the tab 242 is inserted into the first insulating part 23 along the first direction Y, correspondingly, the second part 2422 of the tab 242 is the part of the tab 242 located in the first insulating part 23, and the part of the tab 242 projected in the gap 26 in the thickness direction X of the wall part is the first part 2421, the first part 2421 and the second part 2422 are connected structures.

[0200] In the embodiment, the tab 242 further has the second part 2422 inserted into the first insulating part 23, and the second part 2422 is connected to the electrode terminal 22, so as to realize the electrical connection between the electrode terminal 22 and the electrode assembly 24. The battery monomer 20 adopting this structure can further insulate and separate the second part 2422 of the tab 242 and the shell 21 through the first insulating part 23, which is conducive to reducing the risk of short circuit between the shell 21 and the second part 2422 of the tab 242, so as to improve the use reliability of the battery monomer 20.

[0201] According to some embodiments of the present application, referring to FIG. 6, and further referring to FIG. 8, which is a structural schematic diagram of the first insulating member 23 according to some embodiments of the present application. The first insulating member 23 is internally formed with a mounting cavity 231, the mounting cavity 231 penetrates through the side of the first insulating member 23 facing the main body portion 241 along the first direction Y, and a portion of the electrode terminal 22 is arranged in the first insulating member 23 along the thickness direction X of the wall portion and extends into the mounting cavity 231, and the second portion 2422 of the tab 242 is arranged in the mounting cavity 231 and connected with the electrode terminal 22.

[0202] The mounting cavity 231 penetrates through the side of the first insulating member 23 facing the main body portion 241 along the first direction Y, that is, the mounting cavity 231 is a structure penetrating through the surface of the side of the first insulating member 23 facing the main body portion 241 along the first direction Y, so that the side of the first insulating member 23 facing the main body portion 241 along the first direction Y is formed with an insertion opening in communication with the mounting cavity 231, so as to facilitate the tab 242 to be inserted into the mounting cavity 231 through the insertion opening.

[0203] The portion of the electrode terminal 22 is arranged in the first insulating member 23 along the thickness direction X of the wall portion and extends into the mounting cavity 231, that is, the electrode terminal 22 is a structure arranged in the interior of the first insulating member 23 along the thickness direction X of the wall portion, and the portion of the electrode terminal 22 extends into the mounting cavity 231.

[0204] In the present embodiment, by arranging the mounting cavity 231 in the interior of the first insulating member 23, and the mounting cavity 231 penetrates through the side of the first insulating member 23 facing the main body portion 241 of the electrode assembly 24 along the first direction Y, so as to facilitate the second portion 2422 of the tab 242 arranged at one end of the main body portion 241 along the first direction Y to be inserted into the mounting cavity 231 of the first insulating member 23, which is beneficial to reduce the difficulty of inserting the second portion 2422 of the tab 242 into the first insulating member 23, and can reduce the difficulty of connecting the second portion 2422 of the tab 242 with the portion of the electrode terminal 22 extending into the mounting cavity 231, so as to reduce the assembly difficulty of the battery monomer 20, and improve the production efficiency of the battery monomer 20.

[0205] According to some embodiments of the present application, please continue to refer to FIG. 6 and FIG. 8, the first insulating member 23 can include an insulating body 232 and a partition body 233. Along the thickness direction X of the wall portion, a portion of the insulating body 232 is located between the electrode terminal 22 and the wall portion 211, and a receiving groove 2321 is arranged on the side of the insulating body 232 away from the wall portion 211, a portion of the electrode terminal 22 is arranged in the groove bottom wall of the receiving groove 2321 and extends into the receiving groove 2321, and 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 body 233 is connected with the insulating body 232, and the partition body 233 is arranged opposite to the groove bottom surface of the receiving groove 2321 along the thickness direction X of the wall portion, and the partition body 233 and the groove wall surface of the receiving groove 2321 jointly define the mounting cavity 231.

[0206] The receiving groove 2321 is arranged on the side of the insulating body 232 away from the wall portion 211 along the thickness direction X of the wall portion, and the receiving groove 2321 penetrates through the surface of the side of the insulating body 232 facing the main body portion 241 along the first direction Y, so as to form an insertion opening of the mounting cavity 231 for the tab 242.

[0207] A portion of the electrode terminal 22 is arranged in the groove bottom wall of the receiving groove 2321 and extends into the receiving groove 2321, that is, a through hole is arranged on the groove bottom surface of the receiving groove 2321, the through hole penetrates through the groove bottom wall of the receiving groove 2321 along the thickness direction X of the wall portion, and the electrode terminal 22 is arranged in the through hole and extends one end of the electrode terminal 22 into the receiving groove 2321.

[0208] The partition body 233 of the first insulating member 23 is a structure connected to the insulating body 232, in FIG. 8, the partition body 233 covers the groove opening of the receiving groove 2321 along the thickness direction X of the wall portion, so that the partition body 233 is arranged opposite to the groove bottom surface of the receiving groove 2321 along the thickness direction X of the wall portion, so that the partition body 233 and the surface of the groove bottom surface of the receiving groove 2321 and the groove wall surface of the receiving groove 2321 jointly define the mounting cavity 231 along the thickness direction X of the wall portion, so that the second portion 2422 of the tab 242 is located between the partition body 233 and the groove bottom surface of the receiving groove 2321 along the thickness direction X of the wall portion.

[0209] Optionally, the partition body 233 and the insulating body 232 can be an integrally formed structure, or can be a separately arranged structure, and if the partition body 233 and the insulating body 232 are a separately arranged structure, the connection structure of the partition body 233 and the insulating body 232 can be various, such as bonding, clamping or bolt connection, etc.

[0210] Optionally, referring to FIG. 8, the insulating body 232 of the first insulating piece 23 can further be provided with a plurality of cavities 2322 penetrating the insulating body 232 in the first direction Y and facing the side of the main body portion 241 of the electrode assembly 24, so as to reduce the weight of the first insulating piece 23 and thus the overall weight of the battery monomer 20, thereby improving the energy density of the battery monomer 20.

[0211] In the present embodiment, the first insulating piece 23 comprises an insulating body 232 and a partition body 233, the insulating body 232 is provided with a receiving groove 2321 penetrating the insulating body 232 in the first direction Y and facing the side of the main body portion 241, and the partition body 233 is connected to the insulating body 232 and cooperates with the groove wall of the receiving groove 2321 to define an installation cavity 231. The first insulating piece 23 with such a structure facilitates the structure in which the electrode terminal 22 is partially arranged to extend into the installation cavity 231, and the second portion 2422 of the tab 242 can be inserted into the receiving groove 2321 and connected to the electrode terminal 22 before the partition body 233 and the insulating body 232 are assembled 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 monomer 20.

[0212] In some embodiments, referring to FIG. 8, the partition body 233 and the insulating body 232 are in an integral structure, one end of the partition body 233 can rotate relative to the insulating body 232, and the other end can be clamped to the insulating body 232.

[0213] In some embodiments, referring to FIG. 8, the partition body 233 and the insulating body 232 are in an integral structure, one end of the partition body 233 can rotate relative to the insulating body 232, and the other end can be clamped to the insulating body 232.

[0214] In some embodiments, referring to FIG. 8, the partition body 233 and the insulating body 232 are in an integral structure, one end of the partition body 233 can rotate relative to the insulating body 232, and the other end can be clamped to the insulating body 232.

[0215] In the embodiment, the partition body 233 and the insulating body 232 are arranged as an integrated structure, one end of the partition body 233 is rotatable relative to the insulating body 232, and the other end is clamped with the insulating body 232, so that the partition body 233 is connected to the insulating body 232 and cooperates with the wall surface of the accommodating groove 2321 to define the mounting cavity 231. The first insulating member 23 with the structure is convenient for quick disassembly of the partition body 233 and the insulating body 232 in subsequent use, which is helpful to reduce the difficulty of maintaining the tab 242 and the electrode terminal 22, and to reduce the subsequent maintenance cost of the battery monomer 20.

[0216] Of course, the structure of the first insulating member 23 is not limited to this, and in some embodiments, the first insulating member 23 can also have other structures, for example, the partition body 233 and the insulating body 232 are arranged separately and detachably connected.

[0217] Exemplarily, the partition body 233 is clamped on the insulating body 232, and of course, in other embodiments, the detachable connection structure between the partition body 233 and the insulating body 232 can also be other structures, for example, the partition body 233 can also be detachably connected to the insulating body 232 through a bolt screwing structure or the like.

[0218] In the embodiment, the partition body 233 and the insulating body 232 are arranged as a separate structure and detachably connected, so that the partition body 233 and the insulating body 232 are convenient for quick disassembly in subsequent use, which is helpful to reduce the difficulty of maintaining the tab 242 and the electrode terminal 22, and to reduce the subsequent maintenance cost of the battery monomer 20.

[0219] According to some embodiments of the present application, referring to FIGS. 4 and 5, the electrode assembly 24 can include two tabs 242 with opposite polarities, and the two tabs 242 are respectively connected to two ends of the main body part 241 along the first direction Y. The battery monomer 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 part 211, the two first insulating members 23 are respectively located on two sides of the main body part 241 in the first direction Y, the first insulating member 23 is arranged correspondingly to the electrode terminal 22, and the two second insulating members 25 are arranged at intervals along the first direction Y, and each second insulating member 25 is arranged correspondingly to one tab 242.

[0220] 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 are respectively connected to the two ends of the main body 241 in the first direction Y. Correspondingly, the two first insulating members 23 are respectively located on the two sides of the main body 241 in the first direction Y, and gaps 26 are formed between the main body 241 and the two first insulating members 23.

[0221] Each second insulating member 25 is arranged corresponding to one tab 242, that is, one second insulating member 25 is arranged between each tab 242 and the wall 211, and at least part of the projection of the first part 2421 of each tab 242 in the wall thickness direction X within the corresponding gap 26 is located within the corresponding second insulating member 25.

[0222] In the embodiment, the electrode assembly 24 is provided with two tabs 242, and the two tabs 242 are respectively connected to the two ends of the main body 241 in the first direction Y. Correspondingly, the battery monomer 20 further includes two electrode terminals 22, two first insulating members 23 and two second insulating members 25, and the tabs 242 and the electrode terminals 22, the first insulating members 23 and the second insulating members 25 are arranged one by one, so as to realize the input or output of the positive and negative electrodes of the battery monomer 20, and also realize the insulation isolation between the wall 211 and the two tabs 242 of the electrode assembly 24, so as to reduce the risk of short circuit between the electrode assembly 24 and the wall 211, and improve the use reliability of the battery monomer 20.

[0223] According to some embodiments of the present application, as shown in FIGS. 3, 4 and 5, the shell 21 can include a housing 212 and an end cover 213. The inside of the housing 212 forms a containing cavity with an opening, and the electrode assembly 24 is contained in the containing cavity. The end cover 213 closes the opening, and the end cover 213 is the wall 211.

[0224] The end cover 213 is the wall 211, that is, the electrode terminals 22 are arranged on the end cover 213 of the shell 21. Correspondingly, at least part of the first insulating member 23 is located between the end cover 213 and the electrode terminals 22 in the wall thickness direction X. 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 wall thickness direction X.

[0225] In the embodiment, by arranging the wall 211 of the shell 21 as the end cover 213 of the shell 21 used to close the opening of the housing 212, the battery monomer 20 adopting this structure facilitates the assembly of the electrode terminals 22 on the end cover 213, and can reduce the difficulty of mutual assembly and connection between the electrode terminals 22 and the tabs 242, thereby facilitating the reduction of the manufacturing difficulty of the battery monomer 20, and improving the production efficiency of the battery monomer 20.

[0226] In some embodiments, the electrode assembly 24 is a laminated structure, and the positive electrode sheet and the negative electrode sheet of the electrode assembly 24 are arranged in a laminated manner along the thickness direction X of the wall portion.

[0227] In the present embodiment, by arranging the electrode assembly 24 as a laminated structure, and arranging the positive electrode sheet and the negative electrode sheet of the electrode assembly 24 in a laminated manner along the thickness direction X of the wall portion, on the one hand, the manufacturing difficulty of the battery monomer 20 can be reduced, and on the other hand, the volume of the electrode assembly 24 can be increased to achieve a battery monomer 20 with large capacity.

[0228] In some embodiments, referring to FIGS. 3 and 4, the end cover 213 is the wall with the largest area among the plurality of walls of the shell 21. That is, the outer surface of the end cover 213 is the face with the largest area among the plurality of outer surfaces of the shell 21, and correspondingly, the thickness direction X of the wall portion is also the thickness direction of the battery monomer 20.

[0229] In the present embodiment, by arranging the end cover 213 as the wall with the largest area among the plurality of walls of the shell 21, the wall portion 211 is also the wall with the largest area among the plurality of walls of the shell 21, so that the electrode terminal 22 can be arranged on the wall portion 211, and the second insulating member 25 can be arranged between the wall portion 211 and the tab 242, which is conducive to reducing the assembly difficulty of the battery monomer 20.

[0230] It should be noted that the structure of the battery monomer 20 is not limited thereto, and in some embodiments, the battery monomer 20 can also have other structures. For example, the shell 21 can include a shell body 212 and an end cover 213, the shell body 212 includes an integrally formed side wall and a bottom wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall along the thickness direction X of the wall portion, and the other end of the side wall is closed to form 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, and the bottom wall is the wall portion 211.

[0231] The shell body 212 includes an integrally formed side wall and a bottom wall, that is, the shell body 212 is processed by an integral forming process, such as stamping, casting or extrusion forming, and the like. That is, the side wall and the bottom wall of the shell body 212 are of an integral structure.

[0232] The bottom wall is the wall portion 211, that is, the wall portion 211 is a wall of the shell body 212 arranged opposite to the end cover 213 along the thickness direction X of the wall portion, and correspondingly, the electrode terminal 22 is arranged on the bottom wall of the shell body 212, and at least part of the first insulating member 23 is located between the bottom wall of the shell body 212 and the electrode terminal 22 along the thickness direction X of the wall portion. Similarly, the second insulating member 25 is arranged on the side of the bottom wall of the shell body 212 facing the electrode assembly 24 and is located between the tab 242 and the bottom wall of the shell body 212 along the thickness direction X of the wall portion.

[0233] Of course, in other embodiments, the battery monomer 20 can also be other structures, for example, the side wall of the shell 212 includes the wall portion 211, that is, the wall portion 211 can be one of the walls of the side wall of the shell 212, and correspondingly, the electrode terminal 22 is arranged on the side wall of the shell 212.

[0234] In the present embodiment, by arranging the wall portion 211 of the shell 21 as the bottom wall or the side wall of the shell 212, the wall portion 211 provided with the electrode terminal 22 can be away from the end cover 213, so that the phenomenon that the stress generated by the pulling or twisting of other components to the electrode terminal 22 is transmitted to the connection position of the end cover 213 and the shell 212 can be alleviated, and the risk of connection failure of the end cover 213 and the shell 212 can be reduced, which is beneficial to reduce the leakage risk of the battery monomer 20 in use, so as to improve the use stability and reliability of the battery monomer 20.

[0235] According to some embodiments of the present application, the present application also provides a battery device 100, which includes a plurality of battery monomers 20 of any of the above schemes.

[0236] Wherein, referring to FIG. 2, the battery device 100 can also include a box 10, and the battery monomer 20 is contained in the box 10.

[0237] In some embodiments, the box 10 can 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 containing the battery monomer 20.

[0238] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-shaped structure, which 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 the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 is covered on the open side of the second box body 12.

[0239] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be various shapes, such as a cylinder or a cuboid, etc. For example, in FIG. 2, the box 10 is a cuboid structure.

[0240] Exemplarily, in FIG. 2, a plurality of battery monomers 20 are arranged in the box 10 of the battery device 100, and the plurality of battery monomers 20 can be in series, parallel or mixed connection, where the mixed connection means that the plurality of battery monomers 20 are in both series and parallel connection. The plurality of battery monomers 20 can be directly connected in series, parallel or mixed connection, and the whole of the plurality of battery monomers 20 is accommodated in the box 10. Of course, the battery device 100 can also be in the form that the plurality of battery monomers 20 are first connected in series, parallel or mixed connection to form a battery module, and the plurality of battery modules are connected in series, parallel or mixed connection to form a whole, and the whole is accommodated in the box 10.

[0241] The battery device 100 can further include other structures, for example, the battery device 100 can further include a busbar component connected to the plurality of battery monomers 20 to realize the electrical connection between the plurality of battery monomers 20.

[0242] It should be noted that in some embodiments, the battery device 100 can also not be provided with the box 10, and the battery device 100 includes the plurality of battery monomers 20, and the battery device 100 composed of the plurality of battery monomers 20 can be directly assembled to the power utilization device to provide power for the power utilization device by the plurality of battery monomers 20. That is, the box 10 can be part of the power utilization device. Taking the vehicle 1000 as an example of the power utilization device, the box 10 can be part of the chassis structure of the vehicle 1000, for example, part of the box 10 can be at least part of the floor of the vehicle 1000, or part of the box 10 can be at least part of the cross beam and longitudinal beam of the vehicle 1000.

[0243] According to some embodiments of the present application, the present application further provides a power utilization device, which includes the battery monomer 20 of any of the above schemes or the battery device 100 of any of the above schemes, and the battery monomer 20 or the battery device 100 is used to provide power for the power utilization device.

[0244] The power utilization device can be any of the above devices or systems to which the battery monomer 20 or the battery device 100 is applied.

[0245] According to some embodiments of the present application, referring to FIG. 9, FIG. 9 is a sectional view of an energy storage device 2000 provided by some embodiments of the present application. The present application further provides an energy storage device 2000, which includes the battery monomer 20 of any of the above schemes or the battery device 100 of any of the above schemes.

[0246] Exemplarily, in FIG. 9, the energy storage device 2000 includes an energy storage box 2001 and a plurality of battery devices 100, the plurality of battery devices 100 are accommodated in the energy storage box 2001, of course, in other embodiments, the energy storage device 2000 can also include an energy storage box 2001 and a plurality of battery monomers 20, the plurality of battery monomers 20 are accommodated in the energy storage box 2001.

[0247] According to some embodiments of the present application, referring to FIGS. 3-8, the present application provides a battery cell 20, which comprises a shell 21, two electrode terminals 22, two first insulating members 23, an electrode assembly 24 and two second insulating members 25. The shell 21 has a wall portion 211, and the shell 21 comprises a housing 212 and an end cover 213, the housing 212 has an accommodating cavity with an opening formed in the interior thereof, 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, and the end cover 213 is the wall with the largest area among the plurality of walls of the shell 21. The two electrode terminals 22 are each insulatively mounted on the wall portion 211, and the two electrode terminals 22 are arranged in a spaced manner along a first direction Y. The electrode assembly 24 has a laminated structure, and the positive and negative electrode sheets of the electrode assembly 24 are arranged in a laminated manner along a thickness direction X of the wall portion. The electrode assembly 24 is accommodated in the shell 21, and the electrode assembly 24 comprises a main body portion 241 and two tab portions 242. The two tab portions 242 are opposite in polarity, and the two tab portions 242 are respectively connected to two ends of the main body portion 241 along the first direction Y. Each tab portion 242 is connected to one electrode terminal 22. The two first insulating members 23 are each arranged in the shell 21, and the two first insulating members 23 are respectively arranged on two sides of the main body portion 241 along the first direction Y. The first insulating members 23 are arranged in one-to-one correspondence with the electrode terminals 22. At least part of the first insulating members 23 is located between the corresponding electrode terminals 22 and the wall portion 211 along the thickness direction X of the wall portion, so as to insulatively separate the corresponding electrode terminals 22 and the wall portion 211. The two first insulating members 23 are each arranged in a spaced manner with the main body portion 241 along the first direction Y, so that a gap 26 is formed between the main body portion 241 and the two first insulating members 23. The tab portions 242 are arranged in one-to-one correspondence with the first insulating members 23. The tab portions 242 each comprise 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 along 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. The interior of the first insulating member 23 is formed with a mounting cavity 231 facing the main body portion 241 along the first direction Y. Part of the electrode terminal 22 is arranged in the corresponding first insulating member 23 along the thickness direction X of the wall portion and extends into the mounting cavity 231. The second portion 2422 is located in the mounting cavity 231 of the corresponding first insulating member 23 and is connected to the corresponding electrode terminal 22.The first insulating part 23 comprises an insulating body 232 and a partition body 233. The insulating body 232 is located between the electrode terminal 22 and the wall portion 211 in the thickness direction X of the wall portion. The insulating body 232 is provided with a receiving groove 2321 on the side away from the wall portion 211. The electrode terminal 22 is arranged in the groove bottom wall of the receiving groove 2321 and extends into the receiving groove 2321. The receiving groove 2321 penetrates through the insulating body 232 in the first direction Y and faces the main body portion 241. The partition body 233 is connected to the insulating body 232. The partition body 233 is arranged opposite to the groove bottom surface of the receiving groove 2321 in the thickness direction X of the wall portion. The partition body 233 and the groove wall surface of the receiving groove 2321 jointly define an installation cavity 231. The wall portion 211 is provided with a first surface 2112 facing the electrode assembly 24 in the thickness direction X of the wall portion. Two second insulating parts 25 are adhered to the first surface 2112 and are arranged in the first direction Y. The second insulating part 25 is arranged one-to-one corresponding to the tab 242. In the same plane perpendicular to the thickness direction X of the wall portion, the orthogonal projection of the first portion 2421 is entirely located in the orthogonal projection of the second insulating part 25. In the thickness direction X of the wall portion, the second insulating part 25 is located between the wall portion 211 and the corresponding first insulating part 23, and the second insulating part 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 covered with an insulating film 27. The insulating film 27 is configured to insulate and isolate the insulating shell 21 and the main body portion 241. In the thickness direction X of the wall portion, the second insulating part 25 is located between the wall portion 211 and the insulating film 27. In the second direction Z, the two ends of the second insulating part 25 respectively extend beyond the two 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. The first portion 2421 has opposite first and second ends 2421a and 2421b in the second direction Z. The second insulating part 25 extends beyond the first end 2421a by a dimension L1 in the second direction Z, and 5mm≤L1≤20mm. The second insulating part 25 extends beyond the second end 2421b by a dimension L2 in the second direction Z, and 5mm≤L2≤20mm. The thickness of the second insulating part 25 in the thickness direction X of the wall portion is D, and 10 microns≤D≤30 microns. The material of the second insulating part 25 can be polyimide or polypropylene.

[0248] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0249] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the principles and technical solutions of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode terminal disposed on the wall portion; a first insulating member disposed in the housing, at least a portion of the first insulating member being located between the electrode terminal and the wall portion in a thickness direction of the wall portion; an electrode assembly accommodated in the housing, the electrode assembly including a main body portion and a tab connected to one end of the main body portion in a first direction, the 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 tab including a first portion located in 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 tab in the thickness direction of the wall portion, a projection of the first portion and at least a portion of a projection of the second insulating member overlapping in a same plane perpendicular to the thickness direction of the wall portion. The projection of the first portion is entirely located within the projection of the second insulating member in the same plane perpendicular to the thickness direction of the wall portion.

2. The battery cell of claim 1, wherein, A portion of the second insulating member is located between the wall portion and the first insulating member in the thickness direction of the wall portion.

3. The battery cell of claim 1 or 2, wherein, A portion of the second insulating member is located between the wall portion and the main body portion in the thickness direction of the wall portion.

4. The battery cell of any one of claims 1-3, wherein, In a second direction perpendicular to the first direction and the thickness direction of the wall portion, both ends of the second insulating member extend beyond both ends of the first portion.

5. The battery cell of any one of claims 1-4, wherein, In the second direction, the first portion has opposite first and second ends; 6. The battery cell of claim 5, wherein, wherein a dimension of the second insulating member extending beyond the first end in the second direction is L1, 5mm≤L1≤20mm; and / or a dimension of the second insulating member extending beyond the second end in the second direction is L2, 5mm≤L2≤20mm. 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.

7. The battery cell of any one of claims 1-6, wherein, The second insulating member is bonded to the first surface.

8. The battery cell of claim 7, wherein, In the thickness direction of the wall portion, the second insulating member has a thickness D satisfying 10 microns≤D≤30 microns.

9. The battery cell of any one of claims 1-8, wherein, The second insulating member is made of polyimide or polypropylene.

10. The battery cell of any one of claims 1-9, wherein, An outer surface of the main body portion is covered with an insulating film configured to insulate the main body portion from the housing.

11. The battery cell of any one of claims 1-10, wherein, 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.

12. The battery cell of claim 11, wherein, The 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 connected to the electrode terminal.

13. The battery cell of any one of claims 1-12, wherein, ​ 14. The battery cell of claim 13, wherein, The first insulating member has an installation cavity formed in the interior thereof, the installation cavity extends through a side of the first insulating member facing the main body part along the first direction, and a portion of the electrode terminal is arranged in the first insulating member along the thickness direction of the wall part and extends into the installation cavity, and the second portion is located in the installation cavity and connected with the electrode terminal.

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

16. The battery cell of claim 15, wherein, The partition body is arranged separately from the insulating body and detachably connected with the insulating body; or The partition body and the insulating body are in an integrated structure, one end of the partition body can rotate relative to the insulating body, and the other end can be clamped with the insulating body.

17. The battery cell of any one of claims 1-16, wherein, The electrode assembly comprises two of the tabs with opposite polarities, and the two tabs are respectively connected to two ends of the main body part along the first direction; The battery monomer comprises two of the electrode terminals, two of the first insulating members and two of the second insulating members, the two electrode terminals are arranged at intervals along the first direction on the wall part, the two first insulating members are respectively located on two sides of the main body part along the first direction, the first insulating members are arranged correspondingly with the electrode terminals, and the two second insulating members are arranged at intervals along the first direction, and each of the second insulating members is arranged correspondingly with one of the tabs.

18. The battery cell of any one of claims 1-17, wherein, The shell comprises a shell body and an end cover, the interior of the shell body is formed with a receiving cavity having an opening, the electrode assembly is received in the receiving cavity, and the end cover closes the opening, and the end cover is the wall part. The electrode assembly is a laminated structure, the positive electrode sheet and the negative electrode sheet of the electrode assembly are arranged in a laminated manner along the thickness direction of the wall part, and the end cover is the wall with the largest area among the plurality of walls of the shell.

19. A battery device comprising a plurality of the battery monomers according to any one of claims 1-18.

20. An electric device comprising the battery monomer according to any one of claims 1-18 or the battery device according to claim 19.

21. An energy storage device comprising the battery monomer according to any one of claims 1-18 or the battery device according to claim 19.

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