Battery cell, battery device, energy storage device, energy storage system, and charging network

Abstract

This application provides a battery cell, a battery device, an energy storage device, an energy storage system, and a charging network. The battery cell includes a casing, a first insulating member, and a second insulating member. A bottom surface, a first side surface, and a second side surface intersect each other. A bottom surface covering area covers the bottom surface, a first side surface covering area covers the first side surface, a first flange is connected to the bottom surface covering area, and a second flange is connected to the first side surface covering area. The first flange and the second flange cover the second side surface and have an overlapping portion. The second insulating member is disposed on the outside of the casing, and at least one gap is formed between the first flange and the second flange. At least one of the gaps' orthographic projection on the second side surface falls within the orthographic projection of the second insulating member on the second side surface. The technical solution of this application has high reliability.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, battery device, energy storage device, energy storage system, and charging network. Background Technology

[0002] Currently, with the rapid development of the new energy and energy storage industries, the application of battery devices is becoming increasingly widespread.

[0003] In the manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a battery cell, battery device, energy storage device, energy storage system, and charging network, which have high reliability.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery cell comprising a casing, a first insulating member, and a second insulating member. The casing includes a bottom surface, a first side surface, and a second side surface, which intersect each other. The first insulating member is disposed on the surface of the casing and includes an integrally formed bottom surface covering area, a first side surface covering area, a first flange, and a second flange. The bottom surface covering area covers the bottom surface, the first side surface covering area covers the first side surface, the first flange is connected to the bottom surface covering area, and the second flange is connected to the first side surface covering area. The first flange and the second flange cover the second side surface and have overlapping portions. The second insulating member is disposed on the outer side of the casing, and at least one gap is formed between the first flange and the second flange, wherein the orthographic projection of at least one of the gaps on the second side surface falls within the orthographic projection of the second insulating member on the second side surface.

[0007] According to an embodiment of this application, in a battery cell, a first insulating member is disposed on the surface of the outer casing to achieve insulation isolation between the outer casing and other conductive components. A bottom covering area covers the bottom surface to improve the insulation isolation effect between the bottom surface and other conductive components. A first side covering area covers the first side surface to improve the insulation isolation effect between the first side surface and other conductive components. A first flange is connected to the bottom covering area, and a second flange is connected to the first side covering area. The first and second flanges overlap on the second side surface to improve the insulation isolation effect between the second side surface and other conductive components, thereby improving the reliability of the battery cell. Furthermore, by ensuring that the orthographic projection of at least one of the gaps formed between the first and second flanges on the second side surface falls within the orthographic projection of the second insulating member on the second side surface, the time it takes for liquid to flow through the gap to contact the surface of the outer casing can be delayed, thus delaying the time of casing insulation failure and improving the reliability of the battery cell.

[0008] According to some embodiments of this application, the second insulating member includes a first insulating layer disposed on the outside of the first insulating member, a first gap is formed between the outer surface of the first flange and the outer surface of the second flange, and the first insulating layer covers the first gap; and / or, the second insulating member includes a second insulating layer disposed on a second side surface, a second gap is formed between the inner surface of the first flange and the inner surface of the second flange, and the orthographic projection of the second gap on the second side surface falls within the orthographic projection of the second insulating layer on the second side surface.

[0009] By placing the first insulating layer on the outside of the first insulating member, covering the first gap formed between the outer surfaces of the first flange and the second flange, the time it takes for liquid to flow through the first gap to contact the surface of the casing can be delayed, thereby delaying the time of casing insulation failure and improving the reliability of the battery cell. By placing the second insulating layer on the second side, with the orthographic projection of the second gap on the second side falling within the orthographic projection of the second insulating layer on the second side, the time it takes for liquid entering the inside of the first insulating member through the second gap to contact the surface of the casing can be delayed, thereby delaying the time of casing insulation failure and improving the reliability of the battery cell. By placing the first insulating layer on the outside of the first insulating member, covering the first gap, and by placing the second insulating layer on the second side, with the orthographic projection of the second gap on the second side falling within the orthographic projection of the second insulating layer on the second side, the time it takes for liquid to flow to contact the surface of the casing can be further delayed, delaying the time of casing insulation failure and improving the reliability of the battery cell.

[0010] According to some embodiments of this application, the orthographic projection of the first insulating layer on the second side surface covers the entire second side surface; and / or, the second insulating layer covers the entire second side surface.

[0011] By having the orthographic projection of the first insulating layer onto the entire second side surface, creating a large overlap between the first insulating layer and the first insulating component, the time it takes for liquid to enter the inner side of the first insulating component and for the liquid to flow to and contact the surface of the outer casing is further delayed, thus delaying the time of casing insulation failure and improving the reliability of the battery cell. Similarly, by having the second insulating layer cover the entire second side surface, forming an insulating structure on the second side surface, the flow path of the liquid to and from the surface of the outer casing is further extended, delaying the time of casing insulation failure and improving the reliability of the battery cell.

[0012] According to some embodiments of this application, the outer casing further includes a third side surface, the bottom surface, the second side surface, and the third side surface intersect each other, and the third side surface is disposed opposite to the first side surface in a first direction; the first insulating member further includes a second side surface covering area and a third flange, the second side surface covering area, the third flange and the bottom surface covering area are integrally formed, the second side surface covering area covers the third side surface, the third flange is connected to the second side surface covering area, and the third flange, the second flange and the first flange cover the second side surface and have overlapping portions. A third gap is formed between the outer surface of the first flange and the outer surface of the third flange, and the first insulating layer covers the third gap; and / or, a fourth gap is formed between the inner surface of the first flange and the inner surface of the third flange, and the orthographic projection of the fourth gap on the second side surface falls within the orthographic projection of the second insulating layer on the second side surface.

[0013] By covering the third side with the second side covering area, the insulation isolation effect of the third side from other conductive components is improved. Furthermore, by overlapping the third flange, the second flange, and the first flange on the second side, the insulation isolation effect of the second side from other conductive components is further improved. Moreover, by covering the third gap between the outer surfaces of the first flange and the third flange with the first insulating layer, the time it takes for liquid to flow through the third gap to contact the surface of the casing can be delayed, thereby delaying the time of casing insulation failure and improving the reliability of the battery cell. By having the orthographic projection of the fourth gap on the second side fall within the orthographic projection of the second insulating layer on the second side, the time it takes for liquid entering the inner side of the first insulating component through the fourth gap to contact the surface of the casing can be delayed, thereby delaying the time of casing insulation failure and improving the reliability of the battery cell. Finally, by covering the third gap between the outer surfaces of the first flange and the third flange with the first insulating layer, and having the orthographic projection of the fourth gap on the second side fall within the orthographic projection of the second insulating layer on the second side, the time it takes for liquid to flow to contact the surface of the casing can be further delayed, delaying the time of casing insulation failure and improving the reliability of the battery cell.

[0014] According to some embodiments of this application, a fifth gap is formed between the outer surface of the second flange and the outer surface of the third flange, and the first insulating layer covers the fifth gap; and / or, a sixth gap is formed between the inner surface of the second flange and the inner surface of the third flange, and the orthographic projection of the sixth gap on the second side falls within the orthographic projection of the second insulating layer on the second side.

[0015] By covering the fifth gap between the outer surfaces of the second and third flanges with the first insulating layer, the time it takes for liquid to flow through the fifth gap to contact the surface of the casing can be delayed, thus delaying the time of casing insulation failure and improving the reliability of the battery cell. Similarly, by having the orthographic projection of the sixth gap on the second surface fall within the orthographic projection of the second insulating layer on the second side surface, the time it takes for liquid entering the inside of the first insulating member through the sixth gap to contact the surface of the casing can be delayed, thus delaying the time of casing insulation failure and improving the reliability of the battery cell. Furthermore, by covering the fifth gap between the outer surfaces of the second and third flanges with the first insulating layer, and having the orthographic projection of the sixth gap on the second surface fall within the orthographic projection of the second insulating layer on the second side surface, the time it takes for liquid to flow through the sixth gap to contact the surface of the casing can be further delayed, thus delaying the time of casing insulation failure and improving the reliability of the battery cell.

[0016] According to some embodiments of this application, the battery cell further includes an electrode assembly disposed within the housing, and the electrode assembly has a stacked structure. A first insulating layer extends to a first side coverage area and a second side coverage area, and on the same projection plane perpendicular to the first direction, the orthographic projection of the first insulating layer does not overlap with the orthographic projection of the electrode assembly; and / or, a second insulating layer is also disposed on the first side and a third side, and on the same projection plane perpendicular to the first direction, the orthographic projection of the second insulating layer does not overlap with the orthographic projection of the electrode assembly.

[0017] By extending the first insulating layer to the first side coverage area and the second side coverage area, the path of liquid entering the inner side of the first insulating member can be extended, further delaying the time for liquid to flow to contact the surface of the casing, which is beneficial to improving the reliability of the battery cell; the orthographic projection of the first insulating layer does not overlap with the orthographic projection of the electrode assembly, which can reduce the influence of the first insulating layer on the expansion force release space of the electrode assembly.

[0018] By placing the second insulating layer on the first and third sides, the path of liquid flow to contact the surface of the casing can be extended, further delaying the time for liquid to reach the surface of the casing, which is beneficial to improving the reliability of the battery cell; the orthographic projection of the second insulating layer does not overlap with the orthographic projection of the electrode assembly, which can reduce the influence of the second insulating layer on the expansion force release space of the electrode assembly.

[0019] By extending the first insulating layer to the first and second side coverage areas and setting the second insulating layer on the first and third sides, the path of liquid flow to contact the surface of the casing is further extended, and the time for liquid flow to contact the surface of the casing is delayed, which helps to improve the reliability of the battery cell. The orthographic projection of the first insulating layer does not overlap with the orthographic projection of the electrode assembly, and the orthographic projection of the second insulating layer does not overlap with the orthographic projection of the electrode assembly, which can reduce the influence of the first and second insulating layers on the expansion force release space of the electrode assembly.

[0020] According to some embodiments of this application, the battery cell further includes an electrode assembly disposed within the housing. The electrode assembly has a wound structure, and the number of electrode assemblies is at least one. The thickness direction of the electrode assembly is parallel to the first direction, and the thickness of each electrode assembly is H. A first insulating layer extends to a first side coverage area and a second side coverage area. The overlapping area of ​​the first insulating layer and the first side has a dimension L1 in the second direction, and the overlapping area of ​​the first insulating layer and the third side has a dimension L2 in the second direction, satisfying 0 < L1 ≤ 0.5 * H, 0 < L2 ≤ 0.5 * H. And / or, a second insulating layer is also disposed on the first side and the third side. The overlapping area of ​​the second insulating layer and the first side has a dimension L3 in the second direction, and the overlapping area of ​​the second insulating layer and the third side has a dimension L4 in the second direction, satisfying 0 < L3 ≤ 0.5 * H, 0 < L4 ≤ 0.5 * H. The second direction is perpendicular to the first direction and perpendicular to the second side.

[0021] By extending the first insulating layer to the first side coverage area and the second side coverage area, the path of liquid entering the inner side of the first insulating member can be prolonged, further delaying the time for liquid to flow to contact the surface of the casing, which is beneficial to improving the reliability of the battery cell. By setting the size of the overlapping area of ​​the first insulating layer and the first side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, and setting the size of the overlapping area of ​​the first insulating layer and the third side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, the influence of the first insulating layer on the expansion force release space of the electrode assembly can be reduced.

[0022] By providing a second insulating layer on the first and third sides, the path of liquid flow to contact the surface of the casing can be extended, further delaying the time for liquid to reach the surface of the casing, which is beneficial to improving the reliability of the battery cell. By setting the size of the overlapping area of ​​the second insulating layer and the first side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, and setting the size of the overlapping area of ​​the second insulating layer and the third side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, the influence of the second insulating layer on the expansion force release space of the electrode assembly can be reduced.

[0023] By extending the first insulating layer to the first and second side coverage areas, and setting the second insulating layer on the first and third sides, the path of liquid flow to contact the surface of the casing is further extended, and the time for liquid flow to contact the surface of the casing is further delayed, which helps to improve the reliability of the battery cell. By setting the size of the overlapping area of ​​the first insulating layer and the first side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, setting the size of the overlapping area of ​​the first insulating layer and the third side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, setting the size of the overlapping area of ​​the second insulating layer and the first side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, and setting the size of the overlapping area of ​​the second insulating layer and the third side in the second direction to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly, the influence of the first and second insulating layers on the expansion force release space of the electrode assembly can be reduced.

[0024] According to some embodiments of this application, when a battery cell includes a first insulating layer, the arithmetic mean deviation of the profile of the outer surface of the first insulating layer is Ra, which satisfies 0.05μm≤Ra≤0.50μm.

[0025] If the arithmetic mean deviation of the outer surface of the first insulating layer is too small, the manufacturing difficulty of the first insulating layer will be too high and the manufacturing cost will be too high. If the arithmetic mean deviation of the outer surface of the first insulating layer is too large, liquid will easily adhere to the outer surface of the first insulating layer. Liquid can easily enter the gap between the first insulating layer and the first insulating component through the first insulating layer, making it easier for the liquid to flow to contact the outer shell.

[0026] By setting the arithmetic mean deviation of the outer surface of the first insulating layer to be greater than or equal to 0.05 μm, the processing and manufacturing difficulty of the first insulating layer is reduced, which facilitates the reduction of manufacturing costs. By setting the arithmetic mean deviation of the outer surface of the first insulating layer to be less than or equal to 0.50 μm, the outer surface of the first insulating layer is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer and the first insulating component through the first insulating layer, and facilitates delaying the time for liquid to flow to contact the surface of the outer shell.

[0027] According to some embodiments of this application, 0.1μm≤Ra≤0.4μm.

[0028] By setting the arithmetic mean deviation of the outer surface of the first insulating layer to be greater than or equal to 0.1 μm, the processing and manufacturing difficulty of the first insulating layer is further reduced, which facilitates the reduction of manufacturing costs. By setting the arithmetic mean deviation of the outer surface of the first insulating layer to be less than or equal to 0.4 μm, the outer surface of the first insulating layer is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer and the first insulating component through the first insulating layer, and facilitates delaying the time for liquid to flow to contact the surface of the outer shell.

[0029] According to some embodiments of this application, when a battery cell includes a first insulating layer, the maximum height of the outline of the outer surface of the first insulating layer is Rz, which satisfies 0.2μm≤Rz≤5.0μm.

[0030] If the maximum height of the outer surface of the first insulating layer is too small, the manufacturing difficulty of the first insulating layer will be too high and the manufacturing cost will be too high. If the maximum height of the outer surface of the first insulating layer is too large, liquid will easily adhere to the outer surface of the first insulating layer. Liquid can easily enter the gap between the first insulating layer and the first insulating component through the first insulating layer, making it easier for the liquid to flow to contact the outer shell.

[0031] By setting the maximum height of the outer surface of the first insulating layer to be greater than or less than 0.2 μm, the processing and manufacturing difficulty of the first insulating layer is reduced, which makes it easier to reduce manufacturing costs. By setting the maximum height of the outer surface of the first insulating layer to be less than or equal to 5.0 μm, the outer surface of the first insulating layer is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer and the first insulating component through the first insulating layer, and makes it easier to delay the time for liquid to flow to contact the surface of the outer shell.

[0032] According to some embodiments of this application, 1.00μm≤Rz≤4.0μm.

[0033] By setting the maximum height of the outer surface of the first insulating layer to be greater than or less than 1.00 μm, the processing and manufacturing difficulty of the first insulating layer is further reduced, which facilitates the reduction of manufacturing costs. By setting the maximum height of the outer surface of the first insulating layer to be less than or equal to 4.0 μm, the outer surface of the first insulating layer is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer and the first insulating component through the first insulating layer, and facilitates delaying the time for liquid to flow to contact the surface of the outer shell.

[0034] According to some embodiments of this application, when a battery cell includes a first insulating layer, the first insulating layer is bonded to a first insulating element, and the peel strength between the first insulating layer and the first insulating element is F, which satisfies F≥300N / m.

[0035] By setting the peel strength between the first insulating layer and the first insulating component to 300 N / m, the first insulating layer and the first insulating component have a high adhesive force, which delays the time for liquid to pass through the gap between the first insulating layer and the first insulating component, thereby delaying the time for liquid to flow to contact the surface of the casing, and thus improving the reliability of the battery cell.

[0036] According to some embodiments of this application, the area of ​​the first side surface is larger than the area of ​​the bottom surface, and the area of ​​the first side surface is larger than the area of ​​the second side surface.

[0037] By setting the area of ​​the first side surface to be larger than the area of ​​the bottom surface, and setting the area of ​​the first side surface to be larger than the area of ​​the second side surface, the first side surface can be the large surface of the shell, the first side surface covering area covers the first side surface, and the first flange and the second flange cover the second side surface and have overlapping parts, which facilitates the assembly of the first insulating component and the shell.

[0038] Secondly, this application also provides a battery device comprising a battery cell provided according to any of the above embodiments.

[0039] Thirdly, this application also provides an energy storage device, which includes the battery device provided according to the above embodiments.

[0040] Fourthly, this application also provides an energy storage system, which includes an energy storage converter and an energy storage device according to the above embodiments, wherein the energy storage converter is used to electrically connect the power generation device and the energy storage device.

[0041] Fifthly, this application also provides a charging network, which includes a charging pile and an energy storage device according to the above embodiments, the energy storage device being used to provide electrical energy to the charging pile.

[0042] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0045] Figure 2 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0046] Figure 3 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application;

[0047] Figure 4 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0048] Figure 5 A perspective view of a battery cell provided in some embodiments of this application;

[0049] Figure 6 A schematic diagram illustrating the assembly process of the first insulating element and the housing provided in some embodiments of this application;

[0050] Figure 7 A schematic diagram showing a first insulating element disposed on a housing according to some embodiments of this application;

[0051] Figure 8 This is a schematic diagram illustrating the assembly of the second insulating member and the outer surface of the first insulating member according to some embodiments of this application;

[0052] Figure 9 A schematic diagram showing a second insulating element disposed on a housing according to some embodiments of this application;

[0053] Figure 10 A schematic diagram illustrating the assembly of the outer surfaces of the first insulating member and the second insulating member according to some embodiments of this application;

[0054] Figure 11 This is a schematic diagram illustrating the assembly of the outer surfaces of the second insulating member and the first insulating member according to other embodiments of this application;

[0055] Figure 12 A schematic diagram illustrating the assembly of the outer surfaces of the first insulating member and the second insulating member according to other embodiments of this application;

[0056] Figure 13 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0057] Figure 14 Cross-sectional views of a battery cell provided for other embodiments of this application;

[0058] Figure 15 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0059] Figure 16 A cross-sectional view of a battery cell provided in some embodiments of this application.

[0060] Icons: 1000 - Charging network; 2000 - Energy storage system; 3000 - Power generation device; 100 - Battery device; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Outer shell; 21a - Housing; 21b - End cap; 211 - Bottom surface; 212 - First side surface; 213 - Second side surface; 214 - Third side surface; 22 - First insulating component; 221 - Bottom surface coverage area; 222 - First side surface coverage area; 223 - First flange; 224 - Second flange; 225 - Second side coverage area; 226 - Third flange; 20a - Second insulating element; 23 - First insulating layer; 24 - Second insulating layer; 25 - Electrode terminal; 26 - Electrode assembly; F0 - Gap; F1 - First gap; F2 - Second gap; F3 - Third gap; F4 - Fourth gap; F5 - Fifth gap; F6 - Sixth gap; 200 - Energy storage device; 210 - Energy storage box; 300 - Charging pile; 400 - Energy storage converter; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0061] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0063] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0064] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0067] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0068] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0069] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0075] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0076] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0077] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0078] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0079] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0080] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer 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, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0082] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0083] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0084] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0085] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0086] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0087] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0088] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0089] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0090] In some implementations, the electrode assembly is a stacked structure.

[0091] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, or a composite metal (such as a copper-aluminum composite housing).

[0092] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0093] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0094] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0095] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0096] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0097] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0098] In some embodiments, the battery cell includes a casing and a first insulating member. The first insulating member is disposed on the surface of the casing to form an insulating barrier on the surface of the casing. The insulating member is typically a one-piece structure. When the first insulating member is disposed on the surface of the casing, a portion of the first insulating member forms an overlapping structure on the surface of a portion of the casing wall, and this overlapping structure has a gap. After the battery cell is placed inside the battery device housing, the bottom surface of the battery cell casing is connected to the wall of the housing. Liquid inside the housing (such as condensate, electrolyte, etc.) can easily enter between the first insulating member and the casing through the gap via capillary action, coming into contact with the surface of the casing, thereby causing insulation failure of the casing and reducing the reliability of the battery cell.

[0099] In view of this, in order to solve the problem that liquid enters the inner side of the first insulating member through the gap of the overlapping portion of the first insulating member and comes into contact with the surface of the outer casing, causing insulation failure of the outer casing and resulting in low reliability of the battery cell, this application provides a battery cell including an outer casing, a first insulating member, and a second insulating member. The outer casing includes a bottom surface, a first side surface, and a second side surface, which intersect each other. The first insulating member is disposed on the surface of the outer casing and includes an integrally formed bottom surface covering area, a first side surface covering area, a first flange, and a second flange. The bottom surface covering area covers the bottom surface, the first side surface covering area covers the first side surface, the first flange is connected to the bottom surface covering area, and the second flange is connected to the first side surface covering area. The first flange and the second flange cover the second side surface and have an overlapping portion. The second insulating member is disposed on the outer side of the outer casing, and at least one gap is formed between the first flange and the second flange. The orthographic projection of at least one of the gaps on the second side surface falls within the orthographic projection of the second insulating member on the second side surface.

[0100] In this battery cell, a first insulating member is disposed on the surface of the casing to achieve insulation isolation between the casing and other conductive components. A bottom covering area covers the bottom surface to improve insulation isolation between the bottom surface and other conductive components. A first side covering area covers the first side surface to improve insulation isolation between the first side surface and other conductive components. A first flange is connected to the bottom covering area, and a second flange is connected to the first side covering area. The first and second flanges overlap on the second side surface to improve insulation isolation between the second side surface and other conductive components, thereby improving the reliability of the battery cell. Furthermore, by ensuring that the orthographic projection of the gap formed between at least one of the first and second flanges on the second side surface falls within the orthographic projection of the second insulating member on the second side surface, the time it takes for liquid to flow through the gap to contact the surface of the casing can be delayed, thus delaying the time of casing insulation failure and further improving the reliability of the battery cell.

[0101] The battery device disclosed in this application can be applied to energy storage devices such as energy storage containers or energy storage cabinets.

[0102] The battery device is described below with reference to the accompanying drawings.

[0103] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. Figure 3This is a schematic diagram of the structure of an energy storage device 200 provided in some embodiments of this application. Embodiments of this application provide a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may also include an energy storage device 200, which is electrically connected to the charging pile 300 and provides power to the charging pile 300.

[0104] It should be noted that the charging pile 300 and the battery cells in the energy storage device 200 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to enhance the flexibility of the charging network 1000 during deployment.

[0105] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0106] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0107] The energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0108] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which is electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0109] A power conversion device is used to connect the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 effectively improves its operational safety. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0110] As an example, such as Figure 2 As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0111] Please refer to Figure 3 The energy storage device 200 includes an energy storage box 210, and a battery device 100 is installed inside the energy storage box 210.

[0112] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0113] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0114] Please refer to Figure 4 , Figure 4This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0115] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0116] Please refer to Figures 5 to 10 , Figure 5 This is a perspective view of a battery cell provided in some embodiments of this application. Figure 6 This is a schematic diagram illustrating the assembly process of the first insulating element and the housing provided in some embodiments of this application. Figure 7 This is a schematic diagram showing the first insulating element disposed on the housing according to some embodiments of this application. Figure 8 This is a schematic diagram illustrating the assembly of the second insulating member with the outer surface of the first insulating member according to some embodiments of this application. Figure 9 This is a schematic diagram illustrating the second insulating element disposed on the housing according to some embodiments of this application. Figure 10This is a schematic diagram illustrating the assembly of the outer surfaces of the first insulating member and the second insulating member according to some embodiments of this application. Embodiments of this application provide a battery cell 20, which includes a housing 21, a first insulating member 22, and a second insulating member 20a. The housing 21 includes a bottom surface 211, a first side surface 212, and a second side surface 213, which intersect each other. The first insulating member 22 is disposed on the surface of the housing 21 and includes an integrally formed bottom surface covering area 221, a first side surface covering area 222, a first flange 223, and a second flange 224. The bottom surface covering area 221 covers the bottom surface 211, the first side surface covering area 222 covers the first side surface 212, the first flange 223 is connected to the bottom surface covering area 221, and the second flange 224 is connected to the first side surface covering area 222. The first flange 223 and the second flange 224 cover the second side surface 213 and have overlapping portions. The second insulating member 20a is disposed on the outer side of the housing 21. At least one gap F0 is formed between the first flange 223 and the second flange 224. The orthographic projection of at least one of the gaps F0 on the second side surface 213 falls into the orthographic projection of the second insulating member 20a on the second side surface 213.

[0117] The housing 21 may include a housing 21a and an end cap 21b, the housing 21a having an opening and the end cap 21b closing the opening to isolate the internal environment of the battery cell 20 from the external environment. The housing 21a and the end cap 21b form a receiving cavity for accommodating the electrode assembly.

[0118] The housing 21a is a component used to cooperate with the end cap 21b to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate electrode components, electrolyte, and other components. The housing 21a and the end cap 21b can be independent components. The housing 21a can have various shapes and sizes. Specifically, the shape of the housing 21a can be determined according to the specific shape and size of the electrode components. The housing 21a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0119] End cap 21b refers to a component that covers the opening of housing 21a to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21b can be adapted to the shape of housing 21a to fit it. Optionally, end cap 21b can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21b is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals 25 can be provided on end cap 21b. Electrode terminals 25 can be used for electrical connection with electrode assemblies to output or input electrical energy to battery cell 20. The material of end cap 21b can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of end cap 21b. The insulating structure can be used to isolate the electrical connection components inside housing 21a from end cap 21b to reduce the risk of short circuit. For example, the insulating structure can be made of plastic, rubber, etc.

[0120] In some embodiments, the bottom surface 211, the first side surface 212, and the second side surface 213 can all be the outer surfaces of the housing 21a, wherein the bottom surface 211 can be the outer surface of the wall portion of the housing 21a facing away from the opening. The outer surface of the housing 21a is the surface of the housing 21a facing away from the receiving cavity.

[0121] In some embodiments, the housing 21 may include a bottom wall, a first wall and a second wall, the bottom wall, the first wall and the second wall intersect each other, the bottom surface 211 may be the outer surface of the bottom wall, the first side surface 212 may be the outer surface of the first wall and the second side surface 213 may be the outer surface of the second wall.

[0122] In some embodiments, the bottom surface 211, the first side surface 212, and the second side surface 213 may be perpendicular to each other.

[0123] In some embodiments, the battery cell 20 may further include an electrode assembly disposed within the housing 21a. The electrode assembly is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 21a may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body.

[0124] The first insulating element 22 is disposed on the outside of the outer shell 21. The first insulating element 22 being disposed on the surface of the outer shell 21 means that the first insulating element 22 is attached to the surface of the outer shell 21, or that the first insulating element 22 is bonded to the surface of the outer shell 21.

[0125] In some embodiments, the first insulating element 22 can be an integral structure; please refer to [reference needed]. Figure 5 and Figure 6 When the first insulating member 22 is disposed on the surface of the housing 21, the portion of the first insulating member 22 disposed on the bottom surface 211 forms a bottom surface covering area 221, the portion of the first insulating member 22 disposed on the first side surface 212 forms a first side surface covering area 222, the portion of the first insulating member 22 folded over from the bottom surface 211 to the second side surface 213 forms a first flange 223, the portion of the first insulating member 22 folded over from the first side surface 212 to the second side surface 213 forms a second flange 224, and the first flange 223 and the second flange 224 have overlapping portions.

[0126] In some embodiments, the first flange 223 may cover a portion of the second flange 224, and the inner surface of the first flange 223 may be connected to the outer surface of the second flange 224. For example, the first flange 223 may be located on the side of the second flange 224 opposite to the second side 213, and the first flange 223 may be adhered to the outer surface of the second flange 224. In other embodiments, the second flange 224 may cover a portion of the first flange 223, and the inner surface of the second flange 224 may be connected to the outer surface of the first flange 223. For example, the second flange 224 may be located on the side of the first flange 223 opposite to the second side 213, and the second flange 224 may be adhered to the outer surface of the first flange 223.

[0127] The second insulating member 20a is a structure disposed on the outside of the outer casing 21 to insulate the surface of the outer casing 21. Please refer to [reference needed]. Figure 8 The second insulating member 20a can be disposed on the outside of the first insulating member 22; or, please refer to Figure 9 Alternatively, the second insulating member 20a may be disposed between the first insulating member 22 and the outer shell 21; or, a portion of the second insulating member 20a may be disposed on the outside of the first insulating member 22, and another portion of the second insulating member 20a may be disposed between the first insulating member 22 and the outer shell 21.

[0128] Please refer to Figure 7If the first flange 223 and the second flange 224 are overlapped, a gap F0 is formed between the first flange 223 and the second flange 224. For example, a first gap F1 can be formed between the outer surface of the first flange 223 and the outer surface of the second flange 224, and a second gap F2 can be formed between the inner surface of the first flange 223 and the inner surface of the second flange 224. The outer surface of the first flange 223 refers to the surface of the first flange 223 that is away from the second side 213, and the inner surface of the first flange 223 refers to the surface of the first flange 223 that faces the second side 213. The outer surface of the second flange 224 refers to the surface of the second flange 224 that is away from the second side 213, and the inner surface of the second flange 224 refers to the surface of the second flange 224 that faces the second side 213.

[0129] The orthographic projection of the gap F0 on the second side 213 refers to the projection of the gap F0 on the second side 213 with the direction perpendicular to the second side 213 as the projection direction.

[0130] The orthographic projection of the second insulating member 20a on the second side surface 213 refers to the projection of the second insulating member 20a on the second side surface 212 with the direction perpendicular to the second side surface 213 as the projection direction.

[0131] In some embodiments, please refer to Figure 7 and Figure 8 The second insulating member 20a can be disposed on the outside of the first insulating member 22. The second insulating member 20a is connected to the outer surface of the first flange 223 and the outer surface of the second flange 224. The second insulating member 20a covers the first gap F1. With the direction perpendicular to the second side 213 as the projection direction, the orthographic projection of the first gap F1 on the second side 213 falls into the orthographic projection of the second insulating member 20a on the second side 213.

[0132] In some embodiments, please refer to Figure 7 , Figure 9 and Figure 10 The second insulating member 20a can be disposed between the first insulating member 22 and the outer shell 21. The second insulating member 20a can be connected to the second side surface 213 of the outer shell 21. The second insulating member 20a is disposed corresponding to the second gap F2. The projection direction is perpendicular to the second side surface 213. The orthographic projection of the second gap F2 on the second side surface 213 falls into the orthographic projection of the second insulating member 20a.

[0133] In some embodiments, a portion of the second insulating member 20a may be disposed on the outside of the first insulating member 22, the portion being connected to the outer surface of the first flange 223 and the outer surface of the second flange 224, and the portion covering the first gap F1; another portion of the second insulating member 20a may be disposed between the first insulating member 22 and the outer shell 21, the portion being connected to the second side surface 213 of the outer shell 21 and corresponding to the second gap F2; with the direction perpendicular to the second side surface 213 as the projection direction, the orthographic projection of the first gap F1 on the second side surface 212 and the orthographic projection of the second gap F2 on the second side surface 213 both fall within the orthographic projection of the second insulating member 20a.

[0134] According to the battery cell 20 of this application embodiment, a first insulating member 22 is disposed on the surface of the outer casing 21 to achieve insulation isolation between the outer casing 21 and other conductive members. The bottom surface covering area 221 covers the bottom surface 211 to improve the insulation isolation effect between the bottom surface 211 and other conductive members. The first side surface covering area 222 covers the first side surface 212 to improve the insulation isolation effect between the first side surface 212 and other conductive members. The first flange 223 is connected to the bottom surface covering area 221, and the second flange 224 is connected to the first side surface covering area 222. The first flange 223 and the second flange 224 are overlapped on the second side surface 213 to improve the insulation isolation effect between the second side surface 213 and other conductive members, thereby improving the reliability of the battery cell 20. Furthermore, by having the orthographic projection of the gap F0 formed between at least one of the first flanges 223 and the second flange 224 on the second side surface 213 fall into the orthographic projection of the second insulating member 20a on the second side surface 213, the time it takes for liquid to flow through the gap F0 to contact the surface of the housing 21 can be delayed, thereby delaying the time of insulation failure of the housing 21 and improving the reliability of the battery cell 20.

[0135] According to some embodiments of this application, the second insulating member 20a includes a first insulating layer 23, which is disposed on the outside of the first insulating member 22. A first gap F1 is formed between the outer surface of the first flange 223 and the outer surface of the second flange 224, and the first insulating layer 23 covers the first gap F1; and / or, the second insulating member 20a includes a second insulating layer 24, which is disposed on the second side surface 213. A second gap F2 is formed between the inner surface of the first flange 223 and the inner surface of the second flange 224, and the orthographic projection of the second gap F2 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213.

[0136] The outer side of the first insulating element 22 refers to the side of the first insulating element 22 that is away from the outer casing 21.

[0137] Please refer to Figure 7The first gap F1 refers to the gap formed between the outer surface of the first flange 223 and the outer surface of the second flange 224 after the first flange 223 and the second flange 224 overlap.

[0138] The first insulating layer 23 covering the first gap F1 means that the first insulating layer 23 is disposed on the outer surface of the first flange 223 and the outer surface of the second flange 224, and covers the first gap F1. In this solution, please refer to... Figure 8 The first insulating layer 23 blocks the first gap F1, thereby preventing liquid from flowing from the first gap F1 to the inside of the first insulating member 22, so as to delay the time for the liquid to flow to contact the surface of the outer casing 21.

[0139] It should be noted that the liquids mentioned in the embodiments of this application may include, but are not limited to, condensate, electrolyte, etc.

[0140] The second gap F2 refers to the gap formed between the inner surface of the first flange 223 and the inner surface of the second flange 224 after the first flange 223 and the second flange 224 overlap.

[0141] The orthographic projection of the second gap F2 on the second side surface 213 refers to the projection of the second gap F2 on the second side surface 213 with the direction perpendicular to the second side surface 213 as the projection direction.

[0142] During the manufacturing process of battery cell 20, please refer to... Figure 9 The second insulating layer 24 is first disposed on the second side surface 213, then, please refer to Figure 10 The first insulating element 22 is further disposed on the bottom surface 211, the first side surface 212 and the second side surface 213, and the first insulating element 22 is disposed on the outside of the second insulating layer 24.

[0143] The orthographic projection of the second insulating layer 24 on the second side surface 213 refers to the projection of the second insulating layer 24 on the second side surface 213 with the direction perpendicular to the second side surface 213 as the projection direction.

[0144] In some embodiments, the first flange 223 and the second flange 224 respectively cover the second insulating layer 24. For example, the overlapping area of ​​the first flange 223 and the second flange 224 is connected to the second insulating layer 24.

[0145] "The orthographic projection of the second gap F2 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213" means that, with the projection direction perpendicular to the second side surface 213, the orthographic projection of the second gap F2 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213. In this scheme, even if liquid flows to the inside of the first insulating member 22 through the overlapping portion of the first flange 223 and the second flange 224, the liquid is blocked by the second insulating layer 24, delaying the time it takes for the liquid to reach contact with the surface of the outer casing 21.

[0146] By placing the first insulating layer 23 on the outside of the first insulating member 22, and covering the first gap F1 formed between the outer surface of the first flange 223 and the outer surface of the second flange 224, the time it takes for liquid to flow through the first gap F1 to contact the surface of the outer casing 21 can be delayed, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20. By placing the second insulating layer 24 on the second side 213, the orthographic projection of the second gap F2 on the second side 213 falls within the orthographic projection of the second insulating layer 24 on the second side 213, thus delaying the entry of liquid into the first insulating member 22 through the second gap F2. The time it takes for the liquid inside the casing to flow to contact the surface of the casing 21 is reduced, thus delaying the time when the casing 21 fails to maintain its insulation, thereby improving the reliability of the battery cell 20. By placing the first insulating layer 23 on the outside of the first insulating member 22 and covering the first gap F1, and by placing the second insulating layer 24 on the second side 213, the orthographic projection of the second gap F2 on the second side 213 falls within the orthographic projection of the second insulating layer 24 on the second side 213, the time it takes for the liquid to flow to contact the surface of the casing 21 is further reduced, thus delaying the time when the casing 21 fails to maintain its insulation, thereby improving the reliability of the battery cell 20.

[0147] Please refer to Figure 11 and Figure 12 , Figure 11 This is a schematic diagram illustrating the assembly of the second insulating member with the outer surface of the first insulating member according to other embodiments of this application. Figure 12 This is a schematic diagram illustrating the assembly of the outer surfaces of the first insulating member and the second insulating member according to other embodiments of this application. According to some embodiments of this application, the orthographic projection of the first insulating layer 23 onto the second side surface 213 covers the entire second side surface 213; and / or, the second insulating layer 24 covers the entire second side surface 213.

[0148] "The orthographic projection of the first insulating layer 23 on the second side surface 213 covers the entire second side surface 213" means that the first insulating layer 23 has a large area, and at least a portion of the first insulating layer 23 corresponds to the area of ​​the second side surface 213. In this case, the first insulating layer 23 can cover the portion of the first insulating member 22 disposed on the second side surface 213, so that the first insulating layer 23 can form an insulating protection on the outside of the first insulating member 22, delaying the time for liquid to enter the inside of the first insulating member 22, thereby delaying the time for liquid to contact the surface of the outer casing 21.

[0149] The second insulating layer 24 covers the entire second side surface 213. The second insulating layer 24 can be disposed on the entire second side surface 213 so that the second side surface 213 is isolated by the second insulating layer 24.

[0150] By covering the entire second side 213 with the orthographic projection of the first insulating layer 23 on the second side 213, a large overlap area is created between the first insulating layer 23 and the first insulating member 22, further delaying the time for liquid to enter the inner side of the first insulating member 22 and delaying the time for liquid to flow to contact the surface of the outer casing 21, thereby delaying the time for insulation failure of the outer casing 21 and improving the reliability of the battery cell 20.

[0151] By covering the entire second side surface 213 with the second insulating layer 24, an insulating structure is formed on the second side surface 213, which further extends the flow path of the liquid in contact with the surface of the outer casing 21, delays the time of insulation failure of the outer casing 21, and thus improves the reliability of the battery cell 20.

[0152] By covering the entire second side 213 with the orthographic projection of the first insulating layer 23 on the second side 213, and covering the entire second side 213 with the second insulating layer 24, the second insulating layer 24 forms an insulating structure on the second side 213, which further extends the flow path of the liquid in contact with the surface of the outer casing 21, delays the time of insulation failure of the outer casing 21, and thus improves the reliability of the battery cell 20.

[0153] Please refer to Figures 5 to 10According to some embodiments of this application, the outer shell 21 further includes a third side surface 214, the bottom surface 211, the second side surface 213 and the third side surface 214 intersect each other, and the third side surface 214 and the first side surface 212 are disposed opposite to each other in the first direction X; the first insulating member 22 further includes a second side surface covering area 225 and a third flange 226, the second side surface covering area 225 and the third flange 226 are integrally formed with the bottom surface covering area 221, the second side surface covering area 225 covers the third side surface 214, the third flange 226 is connected to the second side surface covering area 225, and the third flange 226, the second flange 224 and the first flange 223 cover the second side surface 213 and have overlapping portions. A third gap F3 is formed between the outer surface of the first flange 223 and the outer surface of the third flange 226, and the first insulating layer 23 covers the third gap F3; and / or, a fourth gap F4 is formed between the inner surface of the first flange 223 and the inner surface of the third flange 226, and the orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213.

[0154] The third side 214 and the first side 212 are spaced apart in the first direction X, and the third side 214 can be arranged parallel to the first side 212.

[0155] The housing 21 may also include a third sidewall, which is spaced apart from the first sidewall in the first direction X, and the third sidewall 214 may be the outer surface of the third sidewall.

[0156] The second side covering area 225, the third flange 226 and the bottom covering area 221 are integrally formed. During the process of the first insulating member 22 being disposed on the surface of the outer shell 21, the portion of the first insulating member 22 disposed on the bottom surface 211 forms the bottom covering area 221, the portion of the first insulating member 22 disposed on the third side 214 forms the second side covering area 225, and the portion of the first insulating member 22 folded from the third side 214 to the second side 213 forms the third flange 226.

[0157] The third flange 226, the second flange 224, and the first flange 223 have overlapping portions. During the process of the first insulating member 22 being disposed on the surface of the housing 21, the second flange 224 may be disposed on the second side 213, the third flange 226 may be disposed on the second side 213 and cover at least a portion of the second flange 224, and the first flange 223 may be disposed on the second side 213 and cover the second flange 224 and the third flange 226; or, the third flange 226 may be disposed on the second side 213, the second flange 224 may be disposed on the second side 213 and cover at least a portion of the third flange 226, and the first flange 223 may be disposed on the second side 213 and cover the second flange 224 and the third flange 226; or, the first... The flange 223 can be disposed on the second side 213, the second flange 224 can be disposed on the second side 213 and cover at least a portion of the first flange 223, and the third flange 226 can be disposed on the second side 213 and cover the first flange 223 and the second flange 224; or, the first flange 223 can be disposed on the second side 213, the third flange 226 can be disposed on the second side 213 and cover at least a portion of the first flange 223, and the second flange 224 can be disposed on the second side 213 and cover the first flange 223 and the third flange 226; or, the first flange 223 can be located outside the second flange 224 and the third flange 226, and the first flange 223 covers the second flange 224 and the third flange 226.

[0158] The third gap F3 refers to the gap formed between the outer surfaces of the first flange 223 and the third flange 226 after the first flange 223 and the third flange 226 overlap. The outer surface of the third flange 226 refers to the surface of the third flange 226 that faces away from the second side 213.

[0159] The first insulating layer 23 covering the third gap F3 means that the first insulating layer 23 is disposed on the outer surface of the first flange 223 and the outer surface of the third flange 226, and blocks the third gap F3. In this scheme, the first insulating layer 23 blocks the third gap F3, thereby preventing liquid from flowing from the third gap F3 to the inside of the first insulating member 22, so as to delay the time for the liquid to flow to contact the surface of the outer casing 21.

[0160] The fourth gap F4 refers to the gap formed between the inner surface of the first flange 223 and the inner surface of the third flange 226 after the first flange 223 and the third flange 226 overlap. The inner surface of the third flange 226 refers to the surface of the third flange 226 facing the second side 213.

[0161] The orthographic projection of the fourth slit F4 onto the second side surface 213 refers to the projection of the fourth slit F4 onto the second side surface 213 with the direction perpendicular to the second side surface 213 as the projection direction.

[0162] In some embodiments, the first flange 223 and the third flange 226 respectively cover the second insulating layer 24. For example, the overlapping area of ​​the first flange 223 and the third flange 226 is connected to the second insulating layer 24.

[0163] "The orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213" means that, with the projection direction perpendicular to the second side surface 213, the orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213. In this scheme, even if liquid flows to the inside of the first insulating member 22 through the overlapping portion of the first flange 223 and the third flange 226, the liquid is blocked by the second insulating layer 24, delaying the time for the liquid to flow to contact the surface of the outer casing 21.

[0164] By covering the third side 214 with the second side coverage area 225, the insulation isolation effect of the third side 214 from other conductive components is improved. Furthermore, by overlapping the third flange 226, the second flange 224, and the first flange 223 on the second side 213, the insulation isolation effect of the second side 213 from other conductive components is further improved. Moreover, by covering the third gap F3 between the outer surface of the first flange 223 and the outer surface of the third flange 226 with the first insulating layer 23, the time it takes for liquid to flow through the third gap F3 to contact the surface of the outer casing 21 is delayed, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20. By covering the second side 213 with the fourth gap F4... The orthographic projection of the second insulating layer 24 falls within the orthographic projection of the second side surface 213, which can delay the time for the liquid flowing into the inner side of the first insulating member 22 through the fourth gap F4 to contact the surface of the outer casing 21, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20. By covering the third gap F3 between the outer surface of the first flange 223 and the outer surface of the third flange 226 with the first insulating layer 23, the orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213, further delaying the time for the liquid to flow to contact the surface of the outer casing 21, delaying the time of insulation failure of the outer casing 21, thereby improving the reliability of the battery cell 20.

[0165] Please refer to Figures 5 to 12 According to some embodiments of this application, a fifth gap F5 is formed between the outer surface of the second flange 224 and the outer surface of the third flange 226, and the first insulating layer 23 covers the fifth gap F5; and / or, a sixth gap F6 is formed between the inner surface of the second flange 224 and the inner surface of the third flange 226, and the orthographic projection of the sixth gap F6 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213.

[0166] The fifth gap F5 refers to the gap formed between the outer surface of the second flange 224 and the outer surface of the third flange 226 after the second flange 224 and the third flange 226 overlap.

[0167] The first insulating layer 23 covering the fifth gap F5 means that the first insulating layer 23 is disposed on the outer surface of the second flange 224 and the outer surface of the third flange 226, and blocks the fifth gap F5. In this scheme, the first insulating layer 23 blocks the fifth gap F5, thereby preventing liquid from flowing from the fifth gap F5 to the inside of the first insulating member 22, so as to delay the time for liquid to flow to contact the surface of the outer casing 21.

[0168] The sixth gap F6 refers to the gap formed between the inner surface of the second flange 224 and the inner surface of the third flange 226 after the second flange 224 and the third flange 226 overlap.

[0169] The orthographic projection of the sixth slit F6 onto the second side surface 213 refers to the projection of the sixth slit F6 onto the second side surface 213 with the direction perpendicular to the second side surface 213 as the projection direction.

[0170] In some embodiments, the second flange 224 and the third flange 226 respectively cover the second insulating layer 24. For example, the overlapping area of ​​the second flange 224 and the third flange 226 is connected to the second insulating layer 24.

[0171] "The orthographic projection of the sixth gap F6 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213" means that, with the projection direction perpendicular to the second side surface 213, the orthographic projection of the sixth gap F6 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213. In this scheme, even if liquid flows to the inside of the first insulating member 22 through the overlapping portion of the second flange 224 and the third flange 226, the liquid is blocked by the second insulating layer 24, delaying the time for the liquid to flow to contact the surface of the outer casing 21.

[0172] By covering the fifth gap F5 between the outer surface of the second flange 224 and the outer surface of the third flange 226 with the first insulating layer 23, the time it takes for liquid to flow through the fifth gap F5 to contact the surface of the housing 21 can be delayed, thus delaying the time when the insulation of the housing 21 fails, thereby improving the reliability of the battery cell 20.

[0173] By placing the orthographic projection of the sixth gap F6 on the second surface into the orthographic projection of the second insulating layer 24 on the second side 213, the time it takes for the liquid flowing into the inside of the first insulating member 22 through the sixth gap F6 to contact the surface of the outer casing 21 can be delayed, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20.

[0174] By covering the fifth gap F5 between the outer surface of the second flange 224 and the outer surface of the third flange 226 with the first insulating layer 23, the orthographic projection of the sixth gap F6 on the second surface falls into the orthographic projection of the second insulating layer 24 on the second side 213, further delaying the time for liquid to flow to contact the surface of the housing 21, delaying the time for the insulation of the housing 21 to fail, thereby improving the reliability of the battery cell 20.

[0175] Please refer to Figures 8 to 12 and further refer to Figure 13 and Figure 14 , Figure 13 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 14 This is a cross-sectional view of a battery cell provided in some other embodiments of this application. According to some embodiments of this application, the battery cell 20 further includes an electrode assembly 26 disposed within the housing 21, and the electrode assembly 26 has a stacked structure. A first insulating layer 23 extends to a first side coverage area 222 and a second side coverage area 225. On the same projection plane perpendicular to the first direction X, the orthographic projection of the first insulating layer 23 does not overlap with the orthographic projection of the electrode assembly 26; and / or, a second insulating layer 24 is also disposed on the first side 212 and the third side 214. On the same projection plane perpendicular to the first direction X, the orthographic projection of the second insulating layer 24 does not overlap with the orthographic projection of the electrode assembly 26.

[0176] The electrode assembly 26 includes a first electrode, a second electrode, and a separator. The polarity of the first electrode is opposite to that of the second electrode. The separator is disposed between the first electrode and the second electrode. The first electrode, the separator, and the second electrode are stacked.

[0177] During the manufacturing process of the battery cell 20, after the first insulating layer 23 is disposed on the outer surface of the second flange 224 and the outer surface of the third flange 226, one end of the first insulating layer 23 extends from the second flange 224 to the first side coverage area 222, and the other end of the first insulating layer 23 extends from the third flange 226 to the second side coverage area 225.

[0178] In some embodiments, on the same projection plane perpendicular to the first direction X, the orthographic projection of the first insulating layer 23 partially overlaps with the orthographic projection of the first side surface 212, while the orthographic projection of the first insulating layer 23 does not overlap with the orthographic projection of the electrode assembly 26.

[0179] By extending the first insulating layer 23 to the first side coverage area 222 and the second side coverage area 225, the path of liquid entering the inner side of the first insulating member 22 can be extended, further delaying the time for liquid to flow to contact the surface of the outer casing 21, which is beneficial to improving the reliability of the battery cell 20; the orthographic projection of the first insulating layer 23 does not overlap with the orthographic projection of the electrode assembly 26, which can reduce the influence of the first insulating layer 23 on the expansion force release space of the electrode assembly 26.

[0180] During the manufacturing process of the battery cell 20, after the second insulating layer 24 is disposed on the second side 213, one end of the second insulating layer 24 extends from the second side 213 to the first side 212, and the other end of the second insulating layer 24 extends from the second side 213 to the third side 214. Then, the first insulating component 22 is disposed, the bottom surface covering area 221 is disposed on the bottom surface 211, the first side surface covering area 222 is disposed on the first side 212, the second side surface covering area 225 is disposed on the third side 214, and the first flange 223, the second flange 224 and the third flange 226 are disposed on the second side 213.

[0181] In some embodiments, on the same projection plane perpendicular to the first direction X, the orthographic projection of the second insulating layer 24 partially overlaps with the orthographic projection of the third side surface 214, while the orthographic projection of the second insulating layer 24 does not overlap with the orthographic projection of the electrode assembly 26.

[0182] By disposing the second insulating layer 24 on the first side 212 and the third side 214, the path of liquid flow to contact the surface of the housing 21 can be extended, further delaying the time for liquid to flow to contact the surface of the housing 21, which is beneficial to improving the reliability of the battery cell 20; the orthographic projection of the second insulating layer 24 does not overlap with the orthographic projection of the electrode assembly 26, which can reduce the influence of the second insulating layer 24 on the expansion force release space of the electrode assembly 26.

[0183] By extending the first insulating layer 23 to the first side coverage area 222 and the second side coverage area 225, and setting the second insulating layer 24 on the first side 212 and the third side 214, the path of liquid flow to contact the surface of the housing 21 is further extended, and the time of liquid flow to contact the surface of the housing 21 is delayed, which helps to improve the reliability of the battery cell 20. The orthographic projection of the first insulating layer 23 does not overlap with the orthographic projection of the electrode assembly 26, and the orthographic projection of the second insulating layer 24 does not overlap with the orthographic projection of the electrode assembly 26, which can reduce the influence of the first insulating layer 23 and the second insulating layer 24 on the expansion force release space of the electrode assembly 26.

[0184] Please refer to Figures 8 to 12 and further refer to Figure 15 and Figure 16 , Figure 15This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 16 This is a cross-sectional view of a battery cell provided in some embodiments of this application. According to some embodiments of this application, the battery cell 20 further includes an electrode assembly 26 disposed within the housing 21. The electrode assembly 26 has a wound structure, and the number of electrode assemblies 26 is at least one. The thickness direction of the electrode assembly 26 is parallel to the first direction X, and the thickness of each electrode assembly 26 is H. A first insulating layer 23 extends to a first side coverage area 222 and a second side coverage area 225. The overlap area between the first insulating layer 23 and the first side 212 has a dimension L1 in the second direction Y. The overlap area between the first insulating layer 23 and the third side 214 is... The dimension in the second direction Y is L2, satisfying 0 < L1 ≤ 0.5 * H, 0 < L2 ≤ 0.5 * H; and / or, the second insulating layer 24 is also disposed on the first side 212 and the third side 214, the overlapping area of ​​the second insulating layer 24 and the first side 212 has a dimension of L3 in the second direction Y, and the overlapping area of ​​the second insulating layer 24 and the third side 214 has a dimension of L4 in the second direction Y, satisfying 0 < L3 ≤ 0.5 * H, 0 < L4 ≤ 0.5 * H; the second direction Y is perpendicular to the first direction X, and the second direction Y is perpendicular to the second side 213.

[0185] The thickness direction of the electrode assembly 26 can be parallel to the thickness direction of the battery cell 20.

[0186] In some embodiments, the second direction Y may be perpendicular to the first direction X.

[0187] After the first insulating layer 23 extends to the first side coverage area 222, it extends to the area where the first side coverage area 222 overlaps with the first side 212. The first insulating layer 23 and the first side 212 form an overlapping area, which can be called the first overlapping area. Along the second direction Y, the size of the first overlapping area can be L1.

[0188] The method for measuring the size of the overlapping area of ​​the first insulating layer 23 and the first side surface 212 in the second direction Y is as follows: the battery cell 20 is fully discharged, the entire battery cell 20 is soaked in a mixture of epoxy resin AB glue, and after the epoxy resin AB glue solidifies, a protective layer is formed on the outside of the battery cell 20. The battery cell 20 is cut along the first direction X using a cutting machine, and the size of the overlapping area of ​​the first insulating layer 23 and the first side surface 212 in the second direction Y is measured on the cut cross section.

[0189] After the first insulating layer 23 extends to the second side coverage area 225, it extends to the area where the second side coverage area 225 overlaps with the third side 214. The first insulating layer 23 and the third side 214 form an overlapping area, which can be called the second overlapping area. Along the second direction Y, the size of the second overlapping area can be L2.

[0190] The method for measuring the size of the overlapping area of ​​the first insulating layer 23 and the third side surface 214 in the second direction Y is as follows: the battery cell 20 is fully discharged, the entire battery cell 20 is soaked in a mixture of epoxy resin AB glue, and after the epoxy resin AB glue solidifies, a protective layer is formed on the outside of the battery cell 20. The battery cell 20 is cut along the first direction X using a cutting machine, and the size of the overlapping area of ​​the first insulating layer 23 and the third side surface 214 in the second direction Y is measured on the cut cross section.

[0191] In some embodiments, the size of the overlapping area of ​​the first insulating layer 23 and the first side surface 212 in the second direction Y can be, but is not limited to, any one or any two of 0.01*H, 0.05*H, 0.1*H, 0.2*H, 0.3*H, 0.4*H or 0.5*H.

[0192] In some embodiments, the size of the overlapping area of ​​the first insulating layer 23 and the third side surface 214 in the second direction Y can be, but is not limited to, any one or any two of 0.01*H, 0.05*H, 0.1*H, 0.2*H, 0.3*H, 0.4*H or 0.5*H.

[0193] By extending the first insulating layer 23 to the first side coverage area 222 and the second side coverage area 225, the path of liquid entering the inner side of the first insulating member 22 can be extended, further delaying the time for liquid to flow to contact the surface of the outer casing 21, which is beneficial to improving the reliability of the battery cell 20. By setting the size of the overlapping area of ​​the first insulating layer 23 and the first side 212 in the second direction Y to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26, and setting the size of the overlapping area of ​​the first insulating layer 23 and the third side 214 in the second direction Y to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26, the influence of the first insulating layer 23 on the expansion force release space of the electrode assembly 26 can be reduced.

[0194] After the second insulating layer 24 extends to the first side surface 212, the second insulating layer 24 and the first side surface 212 form an overlapping area, which can be called the third overlapping area. Along the second direction Y, the size of the third overlapping area can be L3.

[0195] The method for measuring the size of the overlapping area of ​​the second insulating layer 24 and the first side surface 212 in the second direction Y is as follows: the battery cell 20 is fully discharged, the entire battery cell 20 is soaked in a mixture of epoxy resin AB glue, and after the epoxy resin AB glue solidifies, a protective layer is formed on the outside of the battery cell 20. The battery cell 20 is cut along the first direction X using a cutting machine, and the size of the overlapping area of ​​the second insulating layer 24 and the first side surface 212 in the second direction Y is measured on the cut cross section.

[0196] After the second insulating layer 24 extends to the third side 214, the second insulating layer 24 and the third side 214 form an overlapping area, which can be called the fourth overlapping area. Along the second direction Y, the size of the fourth overlapping area can be L4.

[0197] The method for measuring the size of the overlapping area of ​​the second insulating layer 24 and the third side surface 214 in the second direction Y is as follows: the battery cell 20 is fully discharged, the entire battery cell 20 is soaked in a mixture of epoxy resin AB glue, and after the epoxy resin AB glue solidifies, a protective layer is formed on the outside of the battery cell 20. The battery cell 20 is cut along the first direction X using a cutting machine, and the size of the overlapping area of ​​the second insulating layer 24 and the third side surface 214 in the second direction Y is measured on the cut cross section.

[0198] In some embodiments, the size of the overlapping area of ​​the second insulating layer 24 and the first side surface 212 in the second direction Y can be, but is not limited to, any one or any two of 0.01*H, 0.05*H, 0.1*H, 0.2*H, 0.3*H, 0.4*H or 0.5*H.

[0199] In some embodiments, the size of the overlapping area of ​​the second insulating layer 24 and the third side surface 214 in the second direction Y can be, but is not limited to, any one or any two of 0.01*H, 0.05*H, 0.1*H, 0.2*H, 0.3*H, 0.4*H or 0.5*H.

[0200] By disposing the second insulating layer 24 on the first side 212 and the third side 214, the path of liquid flow to contact the surface of the housing 21 can be extended, further delaying the time for liquid flow to contact the surface of the housing 21, which is beneficial to improving the reliability of the battery cell 20. By setting the size of the overlapping area of ​​the second insulating layer 24 and the first side 212 in the second direction Y to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26, and setting the size of the overlapping area of ​​the second insulating layer 24 and the third side 214 in the second direction Y to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26, the influence of the second insulating layer 24 on the expansion force release space of the electrode assembly 26 can be reduced.

[0201] By extending the first insulating layer 23 to the first side coverage area 222 and the second side coverage area 225, and disposing the second insulating layer 24 on the first side 212 and the third side 214, the path of liquid flow to contact the surface of the housing 21 is further extended, and the time for liquid flow to contact the surface of the housing 21 is further delayed, which is beneficial to improving the reliability of the battery cell 20; by setting the size of the overlapping area of ​​the first insulating layer 23 and the first side 212 in the second direction Y to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26, the first insulating layer 23 and the third side 214 are further extended. The overlapping area of ​​the first insulating layer 23 and the second insulating layer 24 in the second direction Y is set to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26. The overlapping area of ​​the second insulating layer 24 and the first side surface 212 in the second direction Y is set to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26. The overlapping area of ​​the second insulating layer 24 and the third side surface 214 in the second direction Y is set to be greater than 0 and less than or equal to 0.5 times the thickness of each electrode assembly 26. This can reduce the influence of the first insulating layer 23 and the second insulating layer 24 on the expansion force release space of the electrode assembly 26.

[0202] According to some embodiments of this application, the area of ​​the first side surface 212 is larger than the area of ​​the bottom surface 211, and the area of ​​the first side surface 212 is larger than the area of ​​the second side surface 213.

[0203] By setting the area of ​​the first side surface 212 to be larger than the area of ​​the bottom surface 211, and setting the area of ​​the first side surface 212 to be larger than the area of ​​the second side surface 213, the first side surface 212 can be the large surface of the outer shell 21. The first side surface covering area 222 covers the first side surface 212, and the first flange 223 and the second flange 224 cover the second side surface 213 and have overlapping parts, which facilitates the assembly of the first insulating member 22 and the outer shell 21.

[0204] According to some embodiments of this application, when the battery cell 20 includes a first insulating layer 23, the arithmetic mean deviation of the profile of the outer surface of the first insulating layer 23 is Ra, which satisfies 0.05μm≤Ra≤0.50μm.

[0205] The arithmetic mean deviation of the profile, Ra, is a core parameter in the surface roughness evaluation system. It is defined as the arithmetic mean of the absolute distances from each point on the measured surface profile to the profile centerline within the sampling length. The arithmetic mean deviation Ra can be referenced to the national standard GB / T3505-2009 "Geometric Specifications for Products (GPS) - Surface Structure Profiling Method: Terminology, Definitions, and Surface Structure Parameters," and the national standard GB / T1031-2009 "Geometric Specifications for Products (GPS) - Surface Structure Profiling Method: Surface Roughness Parameters and Their Values." The arithmetic mean deviation Ra can be measured using instruments, such as an electric profilometer.

[0206] If the arithmetic mean deviation of the outline of the outer surface of the first insulating layer 23 is too small, the manufacturing difficulty of the first insulating layer 23 will be too high and the manufacturing cost will be too high. If the arithmetic mean deviation of the outline of the outer surface of the first insulating layer 23 is too large, liquid will easily adhere to the outer surface of the first insulating layer 23. The liquid will easily enter the gap between the first insulating layer 23 and the first insulating component 22 through the first insulating layer 23, which will facilitate the liquid to flow to contact the outer shell 21.

[0207] By setting the arithmetic mean deviation of the outer surface of the first insulating layer 23 to be greater than or equal to 0.05 μm, the processing and manufacturing difficulty of the first insulating layer 23 is reduced, which makes it easier to reduce manufacturing costs. By setting the arithmetic mean deviation of the outer surface of the first insulating layer 23 to be less than or equal to 0.50 μm, the outer surface of the first insulating layer 23 is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer 23 and the first insulating component 22 through the first insulating layer 23, and makes it easier to delay the time for liquid to flow to contact the surface of the outer casing 21.

[0208] In some embodiments, the arithmetic mean deviation of the profile of the outer surface of the first insulating layer 23 can be, but is not limited to, any one or any two of 0.05 μm, 0.063 μm, 0.08 μm, 0.1 μm, 0.125 μm, 0.160 μm, 0.2 μm, 0.25 μm, 0.32 μm, 0.4 μm or 0.50 μm.

[0209] According to some embodiments of this application, 0.1μm≤Ra≤0.4μm.

[0210] By setting the arithmetic mean deviation of the outer surface of the first insulating layer 23 to be greater than or equal to 0.1 μm, the manufacturing difficulty of the first insulating layer 23 is further reduced, which facilitates the reduction of manufacturing costs. By setting the arithmetic mean deviation of the outer surface of the first insulating layer 23 to be less than or equal to 0.4 μm, the outer surface of the first insulating layer 23 is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer 23 and the first insulating component 22 through the first insulating layer 23, and facilitates delaying the time for liquid to flow to contact the surface of the outer casing 21.

[0211] According to some embodiments of this application, when the battery cell 20 includes a first insulating layer 23, the maximum height of the outline of the outer surface of the first insulating layer 23 is Rz, which satisfies 0.2μm≤Rz≤5.0μm.

[0212] The maximum height Rz of the profile refers to the maximum vertical distance between the peak line and the valley line of the profile within the sampling length. It is a height characteristic parameter in surface roughness evaluation. The maximum height Rz of the profile can be determined by referring to the national standard GB / T3505-2009 "Geometric Specifications for Products (GPS) - Surface Structure Profiling Method: Terminology, Definitions, and Surface Structure Parameters" and the national standard GB / T1031-2009 "Geometric Specifications for Products (GPS) - Surface Structure Profiling Method: Surface Roughness Parameters and Their Values". The maximum height Rz of the profile can be measured by instruments, such as an electric profilometer.

[0213] If the maximum height of the outline of the outer surface of the first insulating layer 23 is too small, the manufacturing difficulty of the first insulating layer 23 will be too high and the manufacturing cost will be too high. If the maximum height of the outline of the outer surface of the first insulating layer 23 is too large, liquid will easily adhere to the outer surface of the first insulating layer 23. The liquid can easily enter the gap between the first insulating layer 23 and the first insulating element 22 through the first insulating layer 23, which will facilitate the liquid to flow to contact the outer shell 21.

[0214] By setting the maximum height of the outer surface of the first insulating layer 23 to be greater than or less than 0.2 μm, the manufacturing difficulty of the first insulating layer 23 is reduced, which helps to reduce manufacturing costs. By setting the maximum height of the outer surface of the first insulating layer 23 to be less than or equal to 5.0 μm, the outer surface of the first insulating layer 23 is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer 23 and the first insulating member 22 through the first insulating layer 23, and helps to delay the time for liquid to flow to contact the surface of the outer shell 21.

[0215] In some embodiments, the maximum height of the outer surface of the first insulating layer 23 can be, but is not limited to, any one or any two of 0.2μm, 0.25μm, 0.32μm, 0.4μm, 0.50μm, 0.63μm, 0.8μm, 1.00μm, 1.25μm, 1.6μm, 2.0μm, 2.5μm, 3.2μm, 4.0μm, or 5.0μm.

[0216] According to some embodiments of this application, 1μm≤Rz≤4μm.

[0217] By setting the maximum height of the outer surface of the first insulating layer 23 to be greater than or less than 1 μm, the manufacturing difficulty of the first insulating layer 23 is further reduced, which facilitates the reduction of manufacturing costs. By setting the maximum height of the outer surface of the first insulating layer 23 to be less than or equal to 4 μm, the outer surface of the first insulating layer 23 is less likely to be adhered to by liquid, which reduces the risk of liquid entering the gap between the first insulating layer 23 and the first insulating component 22 through the first insulating layer 23, and facilitates delaying the time for liquid to flow to contact the surface of the outer casing 21.

[0218] According to some embodiments of this application, when the battery cell 20 includes a first insulating layer 23, the first insulating layer 23 is bonded to the first insulating element 22, and the peel strength between the first insulating layer 23 and the first insulating element 22 is F, which satisfies F≥300N / m.

[0219] The peel strength between the first insulating layer 23 and the first insulating component 22 can be obtained by measuring according to the national standard GB / T2792-2014, which will not be elaborated here.

[0220] By setting the peel strength between the first insulating layer 23 and the first insulating element 22 to 300 N / m, the first insulating layer 23 and the first insulating element 22 have a high adhesive force, which delays the time for liquid to pass through the gap between the first insulating layer 23 and the first insulating element 22, thereby delaying the time for liquid to flow to contact the surface of the outer casing 21, and thus improving the reliability of the battery cell 20.

[0221] In some embodiments, F ≥ 350 N / m.

[0222] In some embodiments, the first insulating element 22 includes a first substrate layer and a first adhesive layer. The material of the first substrate layer may include polyethylene terephthalate, polyimide, or polypropylene, etc., and the material of the first adhesive layer may include epoxy resin, silicone rubber, or polyurethane, etc.

[0223] In some embodiments, the first insulating layer 23 includes a second substrate layer and a second adhesive layer. The material of the second substrate layer may include polyethylene terephthalate, polyimide, or polypropylene, etc., and the material of the second adhesive layer may include epoxy resin, silicone rubber, or polyurethane, etc.

[0224] In some embodiments, the second insulating layer 24 includes a third substrate layer and a third adhesive layer. The material of the third substrate layer may include polyethylene terephthalate, polyimide, or polypropylene, etc., and the material of the third adhesive layer may include epoxy resin, silicone rubber, or polyurethane, etc.

[0225] In some embodiments, the thickness of the first insulating member 22 is W1, satisfying 0.05mm ≤ W1 ≤ 0.2mm. For example, the thickness of the first insulating member 22 can be, but is not limited to, any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.20mm.

[0226] Optionally, 0.08mm≤W1≤0.16mm.

[0227] In some embodiments, the thickness of the first insulating layer 23 is W2, satisfying 0.05mm ≤ W2 ≤ 0.2mm. For example, the thickness of the first insulating layer 23 can be, but is not limited to, any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.20mm.

[0228] Optionally, 0.08mm ≤ W2 ≤ 0.16mm.

[0229] In some embodiments, the thickness of the second insulating layer 24 is W3, satisfying 0.05mm ≤ W3 ≤ 0.2mm. For example, the thickness of the second insulating layer 24 can be, but is not limited to, any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.20mm.

[0230] Optionally, 0.08mm ≤ W3 ≤ 0.16mm.

[0231] In an embodiment where the outer casing 21 includes a bottom wall, a first wall, a second wall, and a third wall, the outer casing 21 further includes a fourth wall, which is spaced apart from the second wall in the second direction Y. The outer surface of the fourth wall is a fourth side surface, and the bottom surface 211, the first side surface 212, and the fourth side surface intersect each other. The first insulating member 22 further includes a fourth flange, a fifth flange, and a sixth flange. The fourth flange is connected to the bottom surface covering area 221, and the fourth flange and the first flange 223 are located at opposite ends of the bottom surface covering area 221 in the second direction Y. The fifth flange is connected to the first side surface covering area 222, and the sixth flange is connected to the second side surface covering area 225. The fourth flange, the fifth flange, and the sixth flange cover the fourth side surface and have overlapping portions. The fourth flange is integrally formed with the bottom surface covering area 221, the fifth flange is integrally formed with the first side surface covering area 222, and the sixth flange is integrally formed with the second side surface covering area 225. The battery cell 20 also includes a third insulating member disposed outside the first insulating member 22, and a seventh gap is formed between the outer surface of the fourth flange and the outer surface of the fifth flange, with the third insulating member covering the seventh gap; and / or, the battery cell 20 also includes a fourth insulating member disposed on the fourth side, and an eighth gap is formed between the inner surface of the fourth flange and the inner surface of the fifth flange, with the orthographic projection of the eighth gap on the fourth side falling into the orthographic projection of the fourth insulating member on the fourth side, and the first insulating member 22 disposed outside the fourth insulating member.

[0232] The structure of the third insulating member can be the same as that of the first insulating layer 23. When the battery cell 20 includes the third insulating member and the first insulating layer 23, the third insulating member and the first insulating layer 23 are arranged opposite to each other along the second direction Y.

[0233] The structure of the fourth insulating member can be the same as that of the second insulating layer 24. When the battery cell 20 includes the fourth insulating member and the second insulating layer 24, the fourth insulating member and the second insulating layer 24 are arranged opposite to each other along the second direction Y.

[0234] In some embodiments, the first insulating member 22 can be an integral structure. When the first insulating member 22 is disposed on the surface of the housing 21, the portion of the first insulating member 22 disposed on the bottom surface 211 forms a bottom surface covering area 221, the portion of the first insulating member 22 disposed on the first side surface 212 forms a first side surface covering area 222, the portion of the first insulating member 22 disposed on the third side surface 214 forms a second side surface covering area 225, the portion of the first insulating member 22 folded from the bottom surface 211 to the second side surface 213 forms a first flange 223, the portion of the first insulating member 22 folded from the first side surface 212 to the second side surface 213 forms a second flange 224, the portion of the first insulating member 22 folded from the third side surface 214 to the second side surface 213 forms a third flange 226, the portion of the first insulating member 22 folded from the bottom surface 211 to the fourth side surface forms a fourth flange, the portion of the first insulating member 22 folded from the first side surface 212 to the fourth side surface forms a fifth flange, and the portion of the first insulating member 22 folded from the third side surface 214 to the fourth side surface forms a sixth flange.

[0235] The fourth flip-edge setting can refer to the first flip-edge 223 setting, the fifth flip-edge setting can refer to the second flip-edge 224 setting, and the sixth flip-edge setting can refer to the third flip-edge 226 setting.

[0236] In the above embodiments, the fourth flange and the fifth flange are overlapped on the fourth side to improve the insulation and isolation effect between the fourth side and other conductive components. By placing the third insulating member outside the first insulating member 22, and covering the seventh gap formed between the outer surfaces of the fourth and fifth flanges, the time it takes for liquid to flow through the seventh gap to contact the surface of the outer casing 21 can be delayed, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20. By placing the fourth insulating member on the fourth side, and having the orthographic projection of the eighth gap on the fourth side fall within the orthographic projection of the fourth insulating member on the fourth side, the time it takes for liquid entering the inner side of the first insulating member 22 through the eighth gap to contact the surface of the outer casing 21 can be delayed, thereby delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20. By placing the third insulating member outside the first insulating member 22, covering the seventh gap, and by placing the fourth insulating member on the fourth side, and having the orthographic projection of the eighth gap on the fourth side fall within the orthographic projection of the fourth insulating member on the fourth side, the time it takes for liquid to flow to contact the surface of the outer casing 21 can be further delayed, thus delaying the time of insulation failure of the outer casing 21 and improving the reliability of the battery cell 20.

[0237] In some embodiments, a ninth gap is formed between the outer surface of the fourth flange and the outer surface of the sixth flange, and the third insulating member covers the ninth gap; and / or, a tenth gap is formed between the inner surface of the fourth flange and the inner surface of the sixth flange, and the orthographic projection of the tenth gap on the fourth side falls within the orthographic projection of the fourth insulating member on the fourth side.

[0238] By covering the ninth gap between the outer surfaces of the fourth and sixth flanges with the third insulating member, the time it takes for liquid to flow through the ninth gap to contact the surface of the casing 21 can be delayed, thereby delaying the time of insulation failure of the casing 21 and improving the reliability of the battery cell 20. By placing the orthographic projection of the tenth gap on the fourth side into the orthographic projection of the fourth insulating member on the fourth side, the time it takes for liquid entering the inside of the first insulating member 22 through the tenth gap to contact the surface of the casing 21 can be delayed, thereby delaying the time of insulation failure of the casing 21 and improving the reliability of the battery cell 20. By covering the ninth gap between the outer surfaces of the fourth and sixth flanges with the third insulating member, the orthographic projection of the tenth gap on the fourth side falls into the orthographic projection of the fourth insulating member on the fourth side, further delaying the time for liquid to flow to contact the surface of the casing 21 and delaying the time of insulation failure of the casing 21, thereby improving the reliability of the battery cell 20.

[0239] In some embodiments, an eleventh gap is formed between the outer surface of the fifth flange and the outer surface of the sixth flange, and the third insulating member covers the eleventh gap; and / or, a twelfth gap is formed between the inner surface of the fifth flange and the inner surface of the sixth flange, and the orthographic projection of the twelfth gap on the fourth side falls within the orthographic projection of the fourth insulating member on the fourth side.

[0240] By covering the eleventh gap between the outer surfaces of the fifth and sixth flanges with the third insulating member, the time it takes for liquid to flow through the eleventh gap to contact the surface of the casing 21 is delayed, thus delaying the time of insulation failure of the casing 21 and improving the reliability of the battery cell 20. By having the orthographic projection of the twelfth gap on the fourth side fall within the orthographic projection of the fourth insulating member on the fourth side, the time it takes for liquid entering the inside of the first insulating member 22 through the twelfth gap to contact the surface of the casing 21 is delayed, thus delaying the time of insulation failure of the casing 21 and improving the reliability of the battery cell 20. Furthermore, by covering the eleventh gap between the outer surfaces of the fifth and sixth flanges with the third insulating member, and having the orthographic projection of the twelfth gap on the fourth side fall within the orthographic projection of the fourth insulating member on the fourth side, the time it takes for liquid to flow to contact the surface of the casing 21 is further delayed, thus delaying the time of insulation failure of the casing 21 and improving the reliability of the battery cell 20.

[0241] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0242] According to some embodiments of this application, this application also provides an energy storage device 200, which includes the battery device 100 provided according to the above embodiments.

[0243] According to some embodiments of this application, this application also provides an energy storage system 2000, which includes an energy storage converter 400 and an energy storage device 200 provided according to the above embodiments, wherein the energy storage converter 400 is used to electrically connect the power generation device 3000 and the energy storage device 200.

[0244] According to some embodiments of this application, this application also provides a charging network 1000, which includes a charging pile 300 and an energy storage device 200 provided according to the above embodiments, the energy storage device 200 being used to provide electrical energy to the charging pile 300.

[0245] According to some embodiments of this application, please refer to Figures 5 to 16 This application provides a battery cell 20, which includes a housing 21, electrode terminals 25, electrode assembly 26, a first insulating member 22, a first insulating layer 23 and / or a second insulating layer 24.

[0246] The housing 21 includes a housing 21a and an end cap 21b. The housing 21a has an opening, and the end cap 21b closes the opening. Electrode terminals 25 are disposed on the end cap 21b; electrode assemblies 26 are disposed inside the housing 21a.

[0247] The outer casing 21 can be rectangular. The casing 21a includes a bottom wall, a first wall, a second wall, a third wall, and a fourth wall. The bottom wall and the end cap 21b are spaced apart in the third direction Z. The first wall and the third wall are spaced apart in the first direction X, and the second wall and the fourth wall are spaced apart in the second direction Y. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. The outer surface of the bottom wall is the bottom surface 211, the outer surface of the first wall is the first side surface 212, the outer surface of the second wall is the second side surface 213, and the outer surface of the third wall is the third side surface 214.

[0248] The first insulating member 22 is an integrally formed structure. The portion of the first insulating member 22 disposed on the bottom surface 211 forms a bottom surface covering area 221. The portion of the first insulating member 22 disposed on the first side surface 212 forms a first side surface covering area 222. The portion of the first insulating member 22 disposed on the third side surface 214 forms a second side surface covering area 225. The portion of the first insulating member 22 folded from the bottom surface 211 to the second side surface 213 forms a first flange 223. The portion of the first insulating member 22 folded from the first side surface 212 to the second side surface 213 forms a second flange 224. The portion of the first insulating member 22 folded from the third side surface 214 to the second side surface 213 forms a third flange 226. The third flange 226, the second flange 224 and the first flange 223 have overlapping portions.

[0249] In an embodiment where the battery cell 20 includes a first insulating layer 23, the first insulating layer 23 is disposed on the outside of the first insulating member 22. The first insulating layer 23 covers the first gap F1 between the outer surface of the first flange 223 and the outer surface of the second flange 224, and covers the third gap F3 between the outer surface of the first flange 223 and the outer surface of the third flange 226. This can delay the time when liquid flows through the first gap F1 and the third gap F3 to contact the surface of the outer casing 21, thereby delaying the time when the insulation of the outer casing 21 fails, and thus improving the reliability of the battery cell 20.

[0250] In an embodiment where the battery cell 20 includes a second insulating layer 24, the second insulating layer 24 is at least partially disposed on the second side surface 213, the first insulating member 22 is disposed on the outside of the second insulating layer 24, a second gap F2 is formed between the inner surface of the first flange 223 and the inner surface of the second flange 224, and a fourth gap F4 is formed between the inner surface of the first flange 223 and the inner surface of the third flange 226. The orthographic projection of the second gap F2 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213, and the orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213. This can delay the time when liquid flowing into the inside of the first insulating member 22 through the second gap F2 and the fourth gap F4 reaches the surface of the outer casing 21, thereby delaying the time when the insulation of the outer casing 21 fails, and thus improving the reliability of the battery cell 20.

[0251] In an embodiment where the battery cell 20 includes a first insulating layer 23 and a second insulating layer 24, the second insulating layer 24 is at least partially disposed on the second side surface 213, the first insulating member 22 is disposed outside the second insulating layer 24, the first insulating layer 23 is disposed outside the first insulating member 22, and the first insulating layer 23 covers the first gap F1 and the third gap F3. The orthographic projection of the second gap F2 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213, and the orthographic projection of the fourth gap F4 on the second side surface 213 falls within the orthographic projection of the second insulating layer 24 on the second side surface 213. This makes it difficult for liquid to enter the inner side of the first insulating member 22, further delaying the time of insulation failure of the outer casing 21, thereby improving the reliability of the battery cell 20.

[0252] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, include: The outer casing includes a bottom surface, a first side surface, and a second side surface, wherein the bottom surface, the first side surface, and the second side surface intersect each other; A first insulating member is disposed on the surface of the housing. The first insulating member includes an integrally formed bottom surface covering area, a first side surface covering area, a first flange, and a second flange. The bottom surface covering area covers the bottom surface, the first side surface covering area covers the first side surface, the first flange is connected to the bottom surface covering area, and the second flange is connected to the first side surface covering area. The first flange and the second flange cover the second side surface and have an overlapping portion. The battery cell also includes: A second insulating member is disposed on the outer side of the housing, and at least one gap is formed between the first flange and the second flange, wherein the orthographic projection of at least one of the gaps on the second side falls within the orthographic projection of the second insulating member on the second side.

2. The battery cell of claim 1, wherein, The second insulating member includes a first insulating layer disposed on the outside of the first insulating layer, a first gap being formed between the outer surface of the first flange and the outer surface of the second flange, and the first insulating layer covering the first gap; and / or, the second insulating member includes a second insulating layer disposed on the second side surface, a second gap being formed between the inner surface of the first flange and the inner surface of the second flange, and the orthographic projection of the second gap on the second side surface falling into the orthographic projection of the second insulating layer on the second side surface.

3. The battery cell of claim 2, wherein, The orthographic projection of the first insulating layer onto the second side surface covers the entire second side surface; and / or, The second insulating layer covers the entire second side.

4. The battery cell of claim 2, wherein, The outer casing also includes a third side surface, the bottom surface, the second side surface and the third side surface intersect each other, and the third side surface is disposed opposite to the first side surface in a first direction; The first insulating member further includes a second side covering area and a third flange. The second side covering area, the third flange and the bottom covering area are integrally formed. The second side covering area covers the third side. The third flange is connected to the second side covering area. The third flange, the second flange and the first flange cover the second side and have overlapping portions. A third gap is formed between the outer surface of the first flange and the outer surface of the third flange, and the first insulating layer covers the third gap; and / or, a fourth gap is formed between the inner surface of the first flange and the inner surface of the third flange, and the orthographic projection of the fourth gap on the second side falls within the orthographic projection of the second insulating layer on the second side.

5. The battery cell of claim 4, wherein, A fifth gap is formed between the outer surface of the second flange and the outer surface of the third flange, and the first insulating layer covers the fifth gap; and / or, a sixth gap is formed between the inner surface of the second flange and the inner surface of the third flange, and the orthographic projection of the sixth gap on the second side falls within the orthographic projection of the second insulating layer on the second side.

6. The battery cell of claim 4, wherein, The battery cell also includes an electrode assembly, which is disposed within the housing and has a stacked structure. The first insulating layer extends to the first side coverage area and the second side coverage area, and the orthographic projection of the first insulating layer does not overlap with the orthographic projection of the electrode assembly on the same projection plane perpendicular to the first direction; and / or, the second insulating layer is also disposed on the first side and the third side, and the orthographic projection of the second insulating layer does not overlap with the orthographic projection of the electrode assembly on the same projection plane perpendicular to the first direction.

7. The battery cell of claim 4, wherein, The battery cell further includes an electrode assembly disposed within the housing. The electrode assembly has a wound structure, and there is at least one electrode assembly. The thickness direction of the electrode assembly is parallel to the first direction, and the thickness of each electrode assembly is H. The first insulating layer extends to the first side coverage area and the second side coverage area. The overlapping area of ​​the first insulating layer and the first side has a dimension L1 in the second direction, and the overlapping area of ​​the first insulating layer and the third side has a dimension L2 in the second direction, satisfying 0 < L1 ≤ 0.5 * H, 0 < L2 ≤ 0.5 * H; and / or, the second insulating layer is further disposed on the first side and the third side. The overlapping area of ​​the second insulating layer and the first side has a dimension L3 in the second direction, and the overlapping area of ​​the second insulating layer and the third side has a dimension L4 in the second direction, satisfying 0 < L3 ≤ 0.5 * H, 0 < L4 ≤ 0.5 * H; The second direction is perpendicular to the first direction, and the second direction is perpendicular to the second side.

8. The battery cell of claim 2, wherein, When the battery cell includes the first insulating layer, the arithmetic mean deviation of the outer surface of the first insulating layer is Ra, which satisfies 0.05μm≤Ra≤0.50μm.

9. The battery cell of claim 8, wherein, 0.1μm≤Ra≤0.4μm.

10. The battery cell of claim 2, wherein, When the battery cell includes the first insulating layer, the maximum height of the outer surface of the first insulating layer is Rz, which satisfies 0.2μm≤Rz≤5.0μm.

11. The battery cell according to claim 10, characterized in that, 1.00μm≤Rz≤4.0μm.

12. The battery cell of claim 2, wherein, When the battery cell includes the first insulating layer, the first insulating layer is bonded to the first insulating component, and the peel strength between the first insulating layer and the first insulating component is F, which satisfies F≥300N / m.

13. The battery cell of claim 1, wherein, The area of ​​the first side is greater than the area of ​​the bottom surface, and the area of ​​the first side is greater than the area of ​​the second side.

14. A battery device characterized by comprising: Includes the battery cell as described in any one of claims 1-13.

15. An energy storage device, characterized by, Includes the battery device as described in claim 14.

16. An energy storage system characterized by, It includes an energy storage converter and an energy storage device as described in claim 15, wherein the energy storage converter is used to electrically connect the power generation device and the energy storage device.

17. A charging network characterized in that, It includes a charging pile and an energy storage device as described in claim 15, wherein the energy storage device is used to provide electrical energy to the charging pile.

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