Battery cell, battery and electric device

Abstract

A battery cell (12), a battery (100) and an electric device, which belong to the technical field of batteries. The battery cell (12) comprises a casing (121), a first insulating member (125) and a second insulating member (126), wherein the casing (121) comprises a first wall (1213), a second wall (1214) and a side wall (1215); in the direction of the thickness of the first wall (1213), the second wall (1214) and the first wall (1213) are arranged opposite each other; the side wall (1215) is arranged around the first wall (1213) and the second wall (1214); and the first wall (1213) has first edges (12131) and second edges (12132), which are adjacent to one another. The first insulating member (125) covers an outer surface of the first wall (1213). The second insulating member (126) comprises a body portion (1260), first flange portions (1261) and second flange portions (1262), wherein the body portion (1260) covers an outer surface of the side wall (1215); the first flange portions (1261) and the second flange portions (1262) are arranged on the outer surface of the first wall (1213); the first flange portions (1261) are arranged along the first edges (12131); and the second flange portions (1262) are arranged along the second edges (12132). The first insulating member (125) covers at least part of each first flange portion (1261) and at least part of each second flange portion (1262). The first insulating member (125) covers at least part of each first flange portion (1261) and at least part of each second flange portion (1262) to improve the reliability of the battery cell (12).

Description

Battery cells, batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202410264166.8, filed on March 7, 2024, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

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

[0004] How to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Summary of the Invention

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell.

[0006] In a first aspect, the present application provides a battery cell, which includes a shell, a first insulating member, and a second insulating member. The shell includes a first wall, a second wall, and a side wall. The second wall is arranged opposite to the first wall along the thickness direction of the first wall. The side wall is arranged around the first wall and the second wall. The first wall has adjacent first and second edges. The first insulating member covers the outer surface of the first wall. The second insulating member includes a main body, a first flange portion, and a second flange portion. The main body covers the outer surface of the side wall. The first flange portion and the second flange portion are arranged on the outer surface of the first wall. The first flange portion is arranged along the first edge, and the second flange portion is arranged along the second edge. Wherein, the first insulating member covers at least a portion of the first flange portion and at least a portion of the second flange portion.

[0007] In the technical solution of the embodiment of the present application, by covering at least part of the first flange portion and at least part of the second flange portion with a first insulating member, the risk of insulation failure of the battery cell due to warping of the first flange portion and / or the second flange portion can be reduced, which is beneficial to improving the reliability of the battery cell.

[0008] In one or more embodiments of the first aspect, the first flange portion and the second flange portion form an overlapping area at a corner of the first edge and the second edge, and the first insulating member covers the overlapping area.

[0009] In the above solution, since the risk of warping in the overlapping area is high, the first insulating member covering the overlapping area can significantly reduce the risk of insulation failure of the battery cell due to warping of the first flange portion and / or the second flange portion, which is conducive to improving the reliability of the battery cell.

[0010] In one or more embodiments of the first aspect, the first flange portion has a first side away from the main body portion, the second flange portion has a second side away from the main body portion, and the first insulating member covers the first side and the second side.

[0011] In the above solution, by covering the first side and the second side with the first insulating member, most of the first flange portion and the second flange portion can be covered by the first insulating member, which can further reduce the risk of the first flange portion and / or the second flange portion warping, and is conducive to further improving the reliability of the battery cell.

[0012] In one or more embodiments of the first aspect, the first insulating member is provided with a first hollow area, the first wall forms a first exposed area at a position corresponding to the first hollow area, and the first exposed area is used to connect to the box assembly.

[0013] In the above solution, by setting the first exposed area, the battery cells can be directly connected to the box assembly, which is beneficial to improving the connection strength between the box assembly and the battery cells, thereby reducing the risk of shaking of the battery cells after grouping, and is beneficial to improving the reliability of the battery cells.

[0014] In one or more embodiments of the first aspect, the battery cell further includes an electrode terminal, which is disposed on the first wall. The first insulating member further includes a second hollow area, and the electrode terminal is disposed through the second hollow area.

[0015] In the above solution, the second hollow area allows the electrode terminal to pass through, reducing the risk of interference with the electrode terminal during assembly of the first insulating member. At the same time, the second hollow area can also serve as an assembly reference for the first insulating member, reducing the difficulty of assembling the first insulating member.

[0016] In one or more embodiments of the first aspect, the second hollow area is connected to the first hollow area.

[0017] In this solution, because the second hollowed-out area is connected to the first hollowed-out area, the electrode terminal can also serve as a positioning reference for the box assembly during assembly, reducing the difficulty of box assembly. By simply machining a single area on the first insulating member, the first insulating member can accommodate both the electrode terminal and the box assembly. This improves production efficiency and reduces processing costs for the first insulating member, while also providing greater structural stability.

[0018] In one or more embodiments of the first aspect, two electrode terminals are provided, and the two electrode terminals are spaced apart along a first direction. Two first exposed areas are provided, and the two first exposed areas correspond one-to-one to the two electrode terminals. Along the first direction, the first exposed area is located on the side of the corresponding electrode terminal away from the other electrode terminal.

[0019] In the above solution, by providing two first exposed areas, the first wall can be connected to the box assembly via the two first exposed areas, further improving the connection strength between the first wall and the box assembly. Furthermore, during assembly of the box assembly, since the first exposed areas are located on the side of the corresponding electrode terminal away from the other electrode terminal, the box assembly has more space for assembly and is less difficult to assemble.

[0020] In one or more embodiments of the first aspect, along the first direction, a size of the first exposed area is H3, satisfying: 10 mm ≤ H3 ≤ 30 mm.

[0021] In the above scheme, when H3≥10mm, the first wall and the box assembly can have a larger connection area when assembled, and when H3≤30mm, the first insulating part can have a higher strength. Therefore, when 10mm≤H3≤30mm, the first insulating part can have a higher strength and the first wall and the box assembly can have a larger connection area when connected.

[0022] In one or more embodiments of the first aspect, the first edge extends along the second direction, the second edge extends along the first direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. In the first direction, the dimension of the first flange portion is H2, and the minimum distance between the edge of the first insulating member and the first exposed area is H1, satisfying the following: H1 - H2 ≥ 2 mm.

[0023] In the above solution, when H1-H2≥2mm, the first insulating member can cover the first flange portion while forming a larger first exposed area, so that the battery cell has higher insulation performance.

[0024] In one or more embodiments of the first aspect, 1 mm ≤ H2 ≤ 5 mm.

[0025] In the above scheme, when H2≥1mm, the first flange portion can have a larger connection area when assembled with the first wall, which can reduce the difficulty of assembling the second insulating member to a certain extent. When H2≤5mm, more space can be left for setting the first exposed area on the first wall, which is beneficial to improving the connection strength between the box assembly and the first wall. Therefore, when 1mm≤H2≤5mm, the first flange portion can have a larger connection area when assembled with the first wall, while leaving more space for setting the first exposed area on the first wall.

[0026] In one or more embodiments of the first aspect, 3 mm ≤ H1 ≤ 7 mm.

[0027] In the above scheme, when H1≥3mm, the first insulating member can have a larger area for covering the first flange portion, reducing the risk of the first flange portion warping due to the first insulating member not covering the first flange portion after assembly is completed, which is beneficial to improving the reliability of the battery cell. When H1≤7mm, a larger first hollow area can be set on the first insulating member to make the first exposed area formed by the first wall have a larger area, which is beneficial to improving the connection strength between the box assembly and the first wall. Therefore, when 3mm≤H1≤7mm, the first insulating member has a larger area for covering the first flange portion, and the first wall can form a larger first exposed area.

[0028] In one or more embodiments of the first aspect, the first edge extends along the second direction, the second edge extends along the first direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. In the second direction, the dimension of the second flange portion is W1, and the minimum distance between the edge of the first insulating member and the first exposed area is W2, satisfying the following: W2 - W1 ≥ 2 mm.

[0029] In the above solution, when W2-W1≥2mm, the first insulating member can cover the second flange portion while forming a larger first exposed area, so that the battery cell has higher insulation performance.

[0030] In one or more embodiments of the first aspect, 1 mm ≤ W1 ≤ 5 mm.

[0031] In the above scheme, when W1≥1mm, the first flange portion can have a larger connection area when assembled with the first wall, which can reduce the difficulty of assembling the second insulating member to a certain extent. When W1≤5mm, more space can be left for setting the first exposed area on the first wall, which is beneficial to improving the connection strength between the box assembly and the first wall. Therefore, when 1mm≤W1≤5mm, the first flange portion can have a larger connection area when assembled with the first wall while leaving more space for setting the first exposed area on the first wall.

[0032] In one or more embodiments of the first aspect, 3 mm ≤ W2 ≤ 7 mm.

[0033] In the above scheme, when W2≥3mm, the first insulating member can have a larger area for covering the first flange portion, reducing the risk of the first flange portion warping due to the first insulating member not covering the first flange portion after assembly, which is beneficial to improving the reliability of the battery cell. When W2≤7mm, a larger first hollow area can be set on the first insulating member to make the first exposed area formed by the first wall have a larger area, which is beneficial to improving the connection strength between the box assembly and the first wall. Therefore, when 3mm≤W2≤7mm, the first insulating member has a larger area for covering the first flange portion, and the first wall can form a larger first exposed area.

[0034] In one or more embodiments of the first aspect, the second hollow area is spaced apart from the first hollow area.

[0035] In the above solution, the portion of the first insulating member located between the second hollow area and the first hollow area can be used to connect to the first wall, which is beneficial to improving the connection strength between the first insulating member and the first wall.

[0036] In one or more embodiments of the first aspect, the second wall and the side wall are an integrally formed structure. Along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening, and the first wall is an end cover that closes the opening.

[0037] In the above solution, since the second wall and the side wall are integrally formed, there are fewer seams between the second wall and the side wall, the second insulating member is easier to assemble, and the flatness after assembly is higher.

[0038] In one or more embodiments of the first aspect, the main body also covers the outer surface of the second wall, the main body is provided with a third hollow area, the second wall forms a second exposed area at a position corresponding to the third hollow area, and the second exposed area is used to connect with the box body.

[0039] In the above solution, the first wall and the second wall of the housing can be connected to the box assembly and the box through the first exposed area and the second exposed area respectively, which can improve the structural stability of the battery cell after being assembled to the box.

[0040] In one or more embodiments of the first aspect, the battery cell further includes a pressure relief mechanism, which is disposed on the first wall. The first insulating member is provided with a through hole, and a projection of the pressure relief mechanism is located within the through hole along the thickness direction of the first wall.

[0041] In the above solution, since the projection of the pressure relief mechanism is located in the through hole, the first insulating member will not block the pressure relief mechanism when the battery cell thermally runs away, which can make the pressure relief of the battery cell smoother and help improve the reliability of the battery cell.

[0042] In a second aspect, the present application provides a battery comprising the battery cell according to one or more embodiments of the first aspect.

[0043] In the above solution, since the battery cells in one or more embodiments of the first aspect have high reliability, the battery including the battery cells in one or more embodiments of the first aspect also has high reliability.

[0044] In a third aspect, the present application provides a battery comprising a housing, a housing assembly, and a plurality of battery cells according to one or more embodiments of the first aspect, wherein the housing assembly is disposed within the housing. The plurality of battery cells are disposed within the housing. The housing assembly connects first exposed areas of the plurality of battery cells.

[0045] In the above solution, since the battery cells in one or more embodiments of the first aspect have high reliability, the battery including the battery cells in one or more embodiments of the first aspect also has high reliability.

[0046] In a fourth aspect, the present application provides an electrical device comprising the battery of one or more embodiments of the second aspect, wherein the battery is used to provide electrical energy.

[0047] In the above solution, since the battery in one or more embodiments of the second aspect has high reliability, the electrical equipment including the battery in one or more embodiments of the second aspect also has high reliability.

[0048] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0050] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0051] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0052] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0053] FIG4 is a schematic diagram of a partial structure of a battery according to some other embodiments of the present application;

[0054] FIG5 is an axonometric view of a battery cell according to some other embodiments of the present application;

[0055] FIG6 is an axonometric view of a portion of the structure of a battery cell according to some other embodiments of the present application;

[0056] FIG7 is a front view of a battery cell according to some other embodiments of the present application;

[0057] FIG8 is an exploded view of a battery cell according to some other embodiments of the present application;

[0058] FIG9 is a top view of a battery cell according to some other embodiments of the present application;

[0059] FIG10 is a top view of a battery cell according to some further embodiments of the present application;

[0060] FIG11 is a bottom view of a battery cell according to some embodiments of the present application;

[0061] FIG12 is a schematic diagram of a partial structure of batteries according to some other embodiments of the present application.

[0062] The accompanying drawings in the specific implementation manner are as follows:

[0063] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery; 11 - housing; 111 - first part; 112 - second part; 12 - battery cell; 121 - housing; 1211 - end cap; 1212 - housing; 1213 - first wall; 12131 - first edge; 12132 - second edge; 12133 - first exposed area; 1214 - second wall; 12141 - second exposed area; 1215 - side wall; 122 - electrode assembly; 123 - electrode end Sub; 124- adapter; 125-first insulating member; 1251-first hollow area; 1252-second hollow area; 1253-through hole; 126-second insulating member; 1260-main body; 12601-third hollow area; 1261-first flange portion; 12611-first side; 1262-second flange portion; 12621-second side; 1263-overlapping area; 127-pressure relief mechanism; 128-upper plastic; 13-box assembly; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0064] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0067] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0069] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of a battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shapes. Battery cells, depending on the packaging method, may include, but are not limited to, cylindrical battery cells, prismatic battery cells, soft-pack battery cells, and blade battery cells.

[0071] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0072] The following will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, soft-pack battery cells, or blade battery cells in some aspects.

[0073] In a typical battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a shell, wherein the end cap closes an opening of the shell to define a receiving space for receiving the electrode assembly.

[0074] The electrode assembly is housed in the housing. It includes a positive electrode sheet, a negative electrode sheet, and a separator. Battery cells primarily operate by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, serving as the negative electrode tab. The negative electrode collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination.

[0075] The tab generally draws out the electrical energy of the electrode assembly by being electrically connected to a conductive member. In some cases, the conductive member is a transition piece connecting the tab and the electrode terminal. In other cases, the conductive member is the electrode terminal.

[0076] Electrode terminals generally include positive and negative terminals. For rectangular battery cells, electrode terminals are typically located in the end caps. In some other cases, electrode terminals can also be located in the housing. Multiple battery cells can be connected in series and / or in parallel via the electrode terminals for various applications.

[0077] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0078] The battery cell also includes a blue film and a top patch. The blue film covers the outer surface of the shell, and the top patch covers the end cover. The blue film and the top patch are generally made of insulating materials to insulate and isolate the battery cell. During the blue film assembly process, in order to improve the connection strength between the blue film and the shell, after the blue film is wrapped on the outer surface of the shell, part of the blue film will form a blue film flange on the surface of the end cover. When assembling the top patch, considering the need to reserve a certain space on the surface of the end cover to connect with the box assembly, the top patch of the battery cell is usually not covered with the blue film flange. During the battery cell grouping process, the risk of the blue film flange curling is high. If the blue film flange curls, the electrical clearance of the battery cell will be lower than the design value, and the reliability will be reduced.

[0079] In view of this, the present application provides a battery cell, which includes a shell, a first insulating member and a second insulating member. The shell includes a first wall, a second wall and a side wall. Along the thickness direction of the first wall, the second wall is arranged opposite to the first wall, and the side wall is arranged around the first wall and the second wall. The first wall has adjacent first and second edges. The first insulating member covers the outer surface of the first wall. The second insulating member includes a main body, a first flange portion and a second flange portion. The main body covers the outer surface of the side wall. The first flange portion and the second flange portion are arranged on the outer surface of the first wall. The first flange portion is arranged along the first edge, and the second flange portion is arranged along the second edge. The first insulating member covers at least a portion of the first flange portion and at least a portion of the second flange portion. By the first insulating member covering at least a portion of the first flange portion and at least a portion of the second flange portion, the risk of insulation failure of the battery cell due to warping of the first flange portion and / or the second flange portion can be reduced, which is conducive to improving the reliability of the battery cell.

[0080] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0081] Electrical equipment includes, but is not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0083] For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 300, a controller 200, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] To meet different power requirements, the battery 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0085] For example, referring to FIG. 2 , FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a plurality of battery cells 12. The battery 100 may also include a housing 11 having a hollow interior, and the plurality of battery cells 12 are housed within the housing 11. As shown in FIG. 2 , these are referred to herein as a first portion 111 and a second portion 112, respectively. The first portion 111 and the second portion 112 are fastened together. The shapes of the first portion 111 and the second portion 112 may be determined based on the combined shape of the plurality of battery cells 12. The first portion 111 and the second portion 112 may each have a single opening. For example, the first portion 111 and the second portion 112 may each be a hollow rectangular parallelepiped, each with only one open face. The opening of the first portion 111 and the opening of the second portion 112 are arranged opposite each other, and the first portion 111 and the second portion 112 are fastened together to form the housing 11 having a closed chamber. The plurality of battery cells 12 are then arranged in parallel, in series, or in a mixed configuration and then placed within the housing 11 formed by the fastening of the first portion 111 and the second portion 112.

[0086] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Furthermore, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the box 11 through a conductive mechanism. For example, the battery 100 may also include a box assembly 13, which is used to connect multiple battery cells 12 to improve the structural stability of the battery cells 12 after being assembled to the box 11.

[0087] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0088] Please refer to Figure 3, which is an exploded view of a battery cell 12 according to some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a housing 1212. The multiple walls of the housing 1212, i.e., the multiple walls of the housing 121, form a cavity, which can be used to accommodate the electrode assembly 122. The housing 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the housing 1212 may be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the housing 1212 has an opening so that one or more electrode assemblies 122 can be placed in the housing 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

[0089] The battery cell 12 may also include two electrode terminals 123, which may be provided on the end cap 1211. The end cap 1211 is generally in the shape of a flat plate, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal and a negative electrode terminal. Each electrode terminal 123 is provided with a corresponding adapter 124, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, the electrode assembly 122 may be provided as a single or multiple electrode assemblies according to actual use requirements. A plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0090] According to some embodiments of the present application, referring to FIG. 5 to FIG. 8 , the present application provides a battery cell 12, which includes a housing 121, a first insulating member 125, and a second insulating member 126. The housing 121 includes a first wall 1213, a second wall 1214, and a side wall 1215. Along the thickness direction of the first wall 1213, the second wall 1214 is disposed opposite the first wall 1213. The side wall 1215 surrounds the first wall 1213 and the second wall 1214. The first wall 1213 has a first edge 12131 and a second edge 12132 adjacent to each other. The first insulating member 125 covers the outer surface of the first wall 1213. The second insulating member 126 includes a main body 1260, a first flange 1261, and a second flange 1262. The main body 1260 covers the outer surface of the side wall 1215. The first flange 1261 and the second flange 1262 are disposed on the outer surface of the first wall 1213. The first flange 1261 is disposed along the first edge 12131, and the second flange 1262 is disposed along the second edge 12132. The first insulating member 125 covers at least a portion of the first flange 1261 and at least a portion of the second flange 1262.

[0091] The shape of the housing 121 may include, but is not limited to, a cylinder, a cuboid, or a blade, etc. The material of the housing 121 may include, but is not limited to, copper, iron, aluminum, steel, or aluminum alloy, etc.

[0092] The first wall 1213 and the side wall 1215 may be integrally formed or separately formed, and the second wall 1214 and the side wall 1215 may be integrally formed or separately formed.

[0093] In some embodiments, the first wall 1213 is an end cap 1211 .

[0094] In some embodiments, sidewall 1215 and second wall 1214 form housing 1212 .

[0095] The second wall 1214 is arranged opposite to the first wall 1213, and the side wall 1215 is arranged around the first wall 1213 and the second wall 1214, which means that the shell 121 has a receiving cavity, which can be used to accommodate the electrode assembly 122, electrolyte, etc.

[0096] The first wall 1213 has a first edge 12131 and a second edge 12132 adjacent to each other, which means that the first edge 12131 and the second edge 12132 are not two parallel edges, but have an intersection or partially intersect at one point.

[0097] The material of the first insulating member 125 may include but is not limited to rubber, silicone or rubber, etc. The first insulating member 125 may be covered on the outer surface of the first wall 1213 by bonding, clamping, welding, etc.

[0098] The material of the second insulating member 126 may include but is not limited to rubber, silicone or rubber, etc. The second insulating member 126 may be covered on the outer surface of the second wall 1214 and / or the side wall 1215 by bonding, clamping, welding, etc.

[0099] The main body 1260, the first flange 1261 and the second flange 1262 can be integrally formed or separately formed. Any two of them can be integrally formed or separately formed.

[0100] In some embodiments, the first flange portion 1261 has a first side 12611 away from the main body 1260 , the second flange portion 1262 has a second side 12621 away from the main body 1260 , and the first insulating member 125 covers a portion of the first side 12611 and a portion of the second side 12621 .

[0101] In some embodiments, the battery cell 12 further includes a pressure relief mechanism 127 , which can be disposed on any wall of the housing 121 . For example, the pressure relief mechanism 127 can be disposed on the first wall 1213 , the second wall 1214 , or the side wall 1215 .

[0102] Taking the embodiment in which the first flange portion 1261 and the second flange portion 1262 are bonded to the first wall 1213 by colloid as an example, the bonding strength between the first flange portion 1261 and the second flange portion 1262 and the first wall 1213 needs to consider a variety of factors, such as the uniformity of the glue coating, the viscosity of the colloid itself, the ambient temperature, the ambient humidity, etc. After the glue is applied and bonded, there is a risk that the first flange portion 1261 and the second flange portion 1262 will separate from the first wall 1213, or there is a risk that the first flange portion 1261 and the second flange portion 1262 will warp. During the design of the battery cell 12, it is necessary to consider the electrical gap. The electrical gap refers to the minimum air gap distance between two conductors or between a conductor and another conductive body. If the electrical gap is insufficient, the risk of short-circuiting the two conductors is relatively high. Taking the battery cell 12 as the above-mentioned conductor as an example, the electrical clearance of the battery cell 12 can be made to meet the design requirements by covering the outer shell 121 with insulating material. If the first flange portion 1261 and the second flange portion 1262 are warped, it will cause insufficient electrical clearance between the battery cells 12 or between the battery cell 12 and the remaining conductors, and the risk of insulation failure of the battery cell 12 will be increased.

[0103] In the technical solution of the embodiment of the present application, the first insulating member 125 covers at least a portion of the first flange portion 1261 and at least a portion of the second flange portion 1262, thereby reducing the risk of insulation failure of the battery cell 12 due to warping of the first flange portion 1261 and / or the second flange portion 1262, which is beneficial to improving the reliability of the battery cell 12.

[0104] According to some embodiments of the present application, referring to FIG. 5 to FIG. 8 , the first flange portion 1261 and the second flange portion 1262 form an overlapping area 1263 at the corners of the first edge 12131 and the second edge 12132 , and the first insulating member 125 covers the overlapping area 1263 .

[0105] Taking the bonding of the first flange portion 1261 and the second flange portion 1262 as an example, the first flange portion 1261 and the second flange portion 1262 will fold at the corner of the first edge 12131 and the second edge 12132 to form an overlapping area 1263. Since the area of ​​the overlapping area 1263 is small and the bonding surface is uneven, the bonding strength of the overlapping part of the first flange portion 1261 and the second flange portion 1262 is relatively low compared to the bonding strength between the first flange portion 1261 or the second flange portion 1262 and the first wall 1213, that is, the risk of warping in the overlapping area 1263 is relatively high.

[0106] The first insulating member 125 covering the overlapping region 1263 means that the first insulating member 125 and the overlapping region 1263 at least partially overlap.

[0107] In the above solution, since the overlap region 1263 has a higher risk of warping, the first insulating member 125 covering the overlap region 1263 can significantly reduce the risk of insulation failure of the battery cell 12 due to warping of the first flange portion 1261 and / or the second flange portion 1262, thereby improving the reliability of the battery cell 12.

[0108] According to some embodiments of the present application, please refer to Figures 5 to 8, the first flange portion 1261 has a first side 12611 away from the main body portion 1260, the second flange portion 1262 has a second side 12621 away from the main body portion 1260, and the first insulating member 125 covers the first side 12611 and the second side 12621.

[0109] 6 and 8 , the first insulating member 125 covers the first side 12611 and the second side 12621, meaning that the edge of the opening formed by the first flange portion 1261 and the second flange portion 1262 is completely covered by the first insulating member 125. In some embodiments, the first flange portion 1261 and the second flange portion 1262 are integrally formed with the main body 1260. The risk of warping is highest at the locations of the first side 12611 and the second side 12621, and covering the first side 12611 and the second side 12621 can significantly reduce this risk.

[0110] In the above solution, the first insulating member 125 covers the first side 12611 and the second side 12621, so that most of the first flange portion 1261 and the second flange portion 1262 can be covered by the first insulating member 125, which can further reduce the risk of the first flange portion 1261 and / or the second flange portion 1262 warping, which is conducive to further improving the reliability of the battery cell 12.

[0111] According to some embodiments of the present application, please refer to Figures 5 to 8, the first insulating member 125 is provided with a first hollow area 1251, and the first wall 1213 forms a first exposed area 12133 at a position corresponding to the first hollow area 1251, and the first exposed area 12133 is used to connect with the box assembly 13.

[0112] The box assembly 13 may be a pressure strip disposed inside the box 11, or a beam inside the box 11. The material of the pressure strip may include but is not limited to metal or rubber.

[0113] The battery 100 includes multiple battery cells 12, and a box assembly 13 is arranged in the box 11. The box assembly 13 is used to connect with the multiple battery cells 12 to fasten the multiple battery cells 12 into a whole, which is beneficial to reduce the phenomenon of multiple battery cells 12 shaking or colliding with each other in the box 11.

[0114] The first wall 1213 forms a first exposed area 12133 at a position corresponding to the first hollow area 1251, that is, the first insulating member 125 is provided with a first hollow area 1251, so that the first wall 1213 of the outer shell 121 has an area avoided by the first hollow area 1251, thereby forming a first exposed area 12133 on the first wall 1213 that is not covered by the first insulating member 125.

[0115] Optionally, the number of first hollow areas 1251 provided on the first insulating member 125 may be one or more.

[0116] The shape of the first hollow area 1251 may include but is not limited to a triangle, a rectangle, a pentagon, a circle or an ellipse.

[0117] The first hollow area 1251 can be formed by opening a hole in the first insulating member 125 .

[0118] It should be noted that the first exposed area 12133 is used to connect to the box assembly 13. The connection between the first exposed area 12133 and the box assembly 13 can be various ways, such as bonding or welding. The following description will be based on the bonding between the box assembly 13 and the first exposed area 12133.

[0119] In the above solution, by setting the first exposed area 12133, the battery cell 12 can be directly connected to the box assembly 13, which is beneficial to improving the connection strength between the box assembly 13 and the battery cell 12, thereby reducing the risk of shaking of the battery cell 12 after grouping, and is beneficial to improving the reliability of the battery cell 12.

[0120] 5 to 8 , the battery cell 12 further includes an electrode terminal 123 disposed on the first wall 1213. The first insulating member 125 further includes a second hollow region 1252 through which the electrode terminal 123 passes.

[0121] The electrode terminal 123 is disposed through the second hollow area 1252 , which means that the surface of the electrode terminal 123 for electrically connecting to the busbar component is not covered by the first insulating member 125 .

[0122] In some embodiments, the battery cell 12 further includes an upper plastic 128 . The upper plastic 128 is used to insulate and isolate the electrode terminal 123 from the first wall 1213 . The upper plastic 128 is also disposed in the second hollow area 1252 .

[0123] In the above solution, the second hollow area 1252 can allow the electrode terminal 123 to pass through, reducing the risk of interference between the first insulating member 125 and the electrode terminal 123 during assembly. At the same time, the second hollow area 1252 can also serve as an assembly reference for the first insulating member 125, reducing the difficulty of assembling the first insulating member 125.

[0124] According to some embodiments of the present application, referring to FIG. 5 to FIG. 8 , the second hollow area 1252 is connected to the first hollow area 1251 .

[0125] The shape and size of the first hollow area 1251 may be the same as or different from the shape and size of the second hollow area 1252 .

[0126] During assembly of the housing assembly 13, it can be applied along the surface of the electrode terminal 123 near the first exposed area 12133 to the first wall 1213. In other words, the electrode terminal 123 can serve as a positioning reference for the housing assembly 13. Similarly, since the electrode terminal 123 needs to pass through the second hollow area 1252 to exit the first insulating member 125, the positioning of the first insulating member 125 is also completed when the first insulating member 125 is fitted around the electrode terminal 123 through the second hollow area 1252. Furthermore, only one area needs to be machined to simultaneously facilitate the passage of the electrode terminal 123 and the placement of the first exposed area 12133. This reduces the number of machining operations required for the first insulating member 125, resulting in a higher structural strength compared to first insulating members 125 that require multiple machining operations.

[0127] In the above solution, because the second hollow area 1252 is connected to the first hollow area 1251, the electrode terminal 123 can also serve as a positioning reference for the box assembly 13 during assembly of the box assembly 13, thereby reducing the difficulty of assembling the box assembly 13. Only one area needs to be machined on the first insulating member 125 to allow the first insulating member 125 to accommodate both the electrode terminal 123 and the box assembly 13. This improves the production efficiency of the first insulating member 125 and reduces its processing cost. Furthermore, it also provides the first insulating member 125 with greater structural stability.

[0128] According to some embodiments of the present application, please refer to Figures 5 to 8, two electrode terminals 123 are provided, and the two electrode terminals 123 are arranged at intervals along the first direction X. Two first exposed areas 12133 are provided, and the two first exposed areas 12133 correspond one-to-one to the two electrode terminals 123. Along the first direction X, the first exposed area 12133 is located on the side of the electrode terminal 123 corresponding to it, away from the other electrode terminal 123.

[0129] The size of the battery cell 12 is generally much smaller than that of the box 11. The distance between the two electrode terminals 123 in a single battery cell 12 is generally also relatively small. The first exposed area 12133 is located on the side of the corresponding electrode terminal 123 away from the other electrode terminal 123, which means that there is more space for assembling the box assembly 13. Whether it is manual assembly or automated equipment assembly, there is a larger operating space and the assembly difficulty is lower.

[0130] In the above solution, by providing two first exposed areas 12133, the first wall 1213 can be connected to the box assembly 13 via the two first exposed areas 12133, further improving the connection strength between the first wall 1213 and the box assembly 13. Furthermore, when assembling the box assembly 13, since the first exposed areas 12133 are located on the side of the corresponding electrode terminal 123 away from the other electrode terminal 123, the assembly space of the box assembly 13 is larger, and the assembly difficulty is reduced.

[0131] According to some embodiments of the present application, referring to FIG. 5 to FIG. 9 , along the first direction X, the size of the first exposed area 12133 is H3, satisfying: 10 mm ≤ H3 ≤ 30 mm.

[0132] In the first direction X, the size H3 of the first exposed area 12133 can be any value greater than or equal to 10 mm and less than or equal to 30 mm, for example, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, and 30 mm.

[0133] In the above scheme, when H3≥10mm, the first wall 1213 can have a larger connection area when assembled with the box assembly 13, and when H3≤30mm, the first insulating member 125 can have a higher strength. Therefore, when 10mm≤H3≤30mm, the first insulating member 125 can have a higher strength and the first wall 1213 can have a larger connection area when connected to the box assembly 13.

[0134] According to some embodiments of the present application, referring to Figures 5 to 9 , the first edge 12131 extends along the second direction Y, and the second edge 12132 extends along the first direction X. The first direction X, the second direction Y, and the thickness direction of the first wall 1213 are perpendicular to each other. In the first direction X, the dimension of the first flange portion 1261 is H2, and the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 is H1, satisfying the following: H1 - H2 ≥ 2 mm.

[0135] In the first direction X, the difference between the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 and the size of the first flange portion 1261 can be any value greater than or equal to 2 mm, for example, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm.

[0136] In the above solution, when H1-H2≥2mm, the first exposed area 12133 with a larger area is formed, and the first insulating member 125 can cover the first flange portion 1261, so that the battery cell 12 has higher insulation performance.

[0137] According to some embodiments of the present application, please refer to Figures 5 to 9, 1mm≤H2≤5mm.

[0138] In the first direction X, the size of the first flange portion 1261 can be any value greater than or equal to 1 mm and less than or equal to 5 mm, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm.

[0139] In the above scheme, when H2≥1mm, the first flange portion 1261 can have a larger connection area with the first wall 1213 when assembled, which can reduce the difficulty of assembling the second insulating member 126 to a certain extent. When H2≤5mm, more space can be left for setting the first exposed area 12133 on the first wall 1213, which is beneficial to improving the connection strength between the box assembly 13 and the first wall 1213. Therefore, when 1mm≤H2≤5mm, the first flange portion 1261 can have a larger connection area with the first wall 1213 when assembled, while leaving more space for setting the first exposed area 12133 on the first wall 1213.

[0140] According to some embodiments of the present application, please refer to Figures 5 to 9, 3mm≤H1≤7mm.

[0141] In the first direction X, the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 can be any value greater than or equal to 3 mm and less than or equal to 7 mm, for example, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, or 7 mm.

[0142] In the above scheme, when H1≥3mm, the first insulating member 125 can have a larger area for covering the first flange portion 1261, reducing the risk of the first flange portion 1261 warping due to the first insulating member 125 not covering the first flange portion 1261 after assembly, which is beneficial to improving the reliability of the battery cell 12. When H1≤7mm, a larger first hollow area 1251 can be set on the first insulating member 125 to make the first exposed area 12133 formed by the first wall 1213 have a larger area, which is beneficial to improving the connection strength between the box assembly 13 and the first wall 1213. Therefore, when 3mm≤H1≤7mm, the first insulating member 125 has a larger area for covering the first flange portion 1261, while the first wall 1213 can form a larger first exposed area 12133.

[0143] According to some embodiments of the present application, referring to Figures 5 to 9 , the first edge 12131 extends along the second direction Y, and the second edge 12132 extends along the first direction X. The first direction X, the second direction Y, and the thickness direction of the first wall 1213 are perpendicular to each other. In the second direction Y, the dimension of the second flange portion 1262 is W1, and the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 is W2, satisfying the following: W2 - W1 ≥ 2 mm.

[0144] In the second direction Y, the difference between the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 and the size of the second flange portion 1262 can be any value greater than or equal to 2 mm, for example, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm.

[0145] In the above solution, when W2 - W1 ≥ 2 mm, the first insulating member 125 can cover the second flange portion 1262 while forming the first exposed area 12133 with a larger area, so that the battery cell 12 has higher insulation performance.

[0146] According to some embodiments of the present application, please refer to Figures 5 to 9, 1mm≤W1≤5mm.

[0147] In the second direction Y, the size of the second flange portion 1262 can be any value greater than or equal to 1 mm and less than or equal to 5 mm, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm.

[0148] In the above scheme, when W1≥1mm, the first flange portion 1261 can have a larger connection area with the first wall 1213 when assembled, which can reduce the difficulty of assembling the second insulating member 126 to a certain extent. When W1≤5mm, more space can be left for setting the first exposed area 12133 on the first wall 1213, which is beneficial to improving the connection strength between the box assembly 13 and the first wall 1213. Therefore, when 1mm≤W1≤5mm, the first flange portion 1261 can have a larger connection area with the first wall 1213 when assembled, while leaving more space for setting the first exposed area 12133 on the first wall 1213.

[0149] According to some embodiments of the present application, please refer to Figures 5 to 9, 3mm≤W2≤7mm.

[0150] In the second direction Y, the minimum distance between the edge of the first insulating member 125 and the first exposed area 12133 can be any value greater than or equal to 3 mm and less than or equal to 7 mm, for example, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm.

[0151] In the above scheme, when W2≥3mm, the first insulating member 125 can have a larger area for covering the first flange portion 1261, reducing the risk of the first flange portion 1261 being warped due to the first insulating member 125 not covering the first flange portion 1261 after assembly, which is beneficial to improving the reliability of the battery cell 12. When W2≤7mm, a larger first hollow area 1251 can be set on the first insulating member 125 to make the first exposed area 12133 formed by the first wall 1213 have a larger area, which is beneficial to improving the connection strength between the box assembly 13 and the first wall 1213. Therefore, when 3mm≤W2≤7mm, the first insulating member 125 has a larger area for covering the first flange portion 1261, while the first wall 1213 can form a larger first exposed area 12133.

[0152] According to some embodiments of the present application, referring to FIG. 10 , the second hollow area 1252 is spaced apart from the first hollow area 1251 .

[0153] The second hollow area 1252 can be formed by punching or other methods.

[0154] The electrode terminal 123 passes through the second hollow area 1252 , and the second hollow area 1252 is spaced apart from the first hollow area 1251 , which means that part of the first insulating member 125 is located between the electrode terminal 123 and the second hollow area 1252 .

[0155] In the above solution, the portion of the first insulating member 125 located between the second hollow area 1252 and the first hollow area 1251 can be used to connect to the first wall 1213 , which is beneficial to improving the connection strength between the first insulating member 125 and the first wall 1213 .

[0156] According to some embodiments of the present application, please refer to Figures 5 to 8, the second wall 1214 and the side wall 1215 are an integrally formed structure. Along the thickness direction of the first wall 1213, one end of the side wall 1215 is connected to the second wall 1214, and the other end is enclosed to form an opening. The first wall 1213 is an end cover 1211 that closes the opening.

[0157] The second wall 1214 and the side wall 1215 enclose a hollow structure with one end open in the thickness direction of the first wall 1213 , and the first wall 1213 covers the opening to form a housing 121 for accommodating the electrode assembly 122 .

[0158] The second wall 1214 and the side wall 1215 are an integrally formed structure, that is, the second wall 1214 and the side wall 1215 of the housing 121 are made by an integral forming process, such as stamping or casting.

[0159] In the above solution, since the second wall 1214 and the side wall 1215 are integrally formed, there are fewer seams between the second wall 1214 and the side wall 1215, the second insulating member 126 is easier to assemble, and the flatness after assembly is higher.

[0160] According to some embodiments of the present application, please refer to Figures 5 and 11, the main body 1260 also covers the outer surface of the second wall 1214, the main body 1260 is provided with a third hollow area 12601, and the second wall 1214 forms a second exposed area 12141 at a position corresponding to the third hollow area 12601, and the second exposed area 12141 is used to connect with the box body 11.

[0161] The second wall 1214 forms a second exposed area 12141 at a position corresponding to the third hollow area 12601 , so that the second wall 1214 of the housing 121 has an area avoided by the third hollow area 12601 , thereby forming a second exposed area 12141 on the second wall 1214 that is not covered by the second insulating member 126 .

[0162] The number of the third hollow area 12601 can be one or more.

[0163] The shape of the third hollow area 12601 may include but is not limited to a rectangle, a triangle, a pentagon, a circle or an ellipse.

[0164] There may be various ways to connect the second exposed area 12141 and the box body 11, such as bonding or welding.

[0165] In the above solution, the first wall 1213 and the second wall 1214 of the shell 121 can be connected to the box assembly 13 and the box 11 through the first exposed area 12133 and the second exposed area 12141 respectively, which can improve the structural stability of the battery cell 12 after being assembled to the box 11.

[0166] According to some embodiments of the present application, please refer to Figures 5 to 8, the battery cell 12 also includes a pressure relief mechanism 127, the pressure relief mechanism 127 is arranged on the first wall 1213, and the first insulating member 125 is provided with a through hole 1253. Along the thickness direction of the first wall 1213, the projection of the pressure relief mechanism 127 is located in the through hole 1253.

[0167] The pressure relief mechanism 127 is used to release pressure within the battery cell 12 when the internal pressure or temperature of the battery cell 12 reaches a predetermined value. The pressure relief mechanism 127 is disposed on the first wall 1213. Accordingly, the first insulating member 125 is provided with a through hole 1253 for accommodating the pressure relief mechanism 127, thereby facilitating the release of pressure within the battery cell 12. The pressure relief mechanism 127 can be a pressure relief component such as an explosion-proof valve, explosion-proof disk, air valve, pressure relief valve, or safety valve.

[0168] In the above solution, since the projection of the pressure relief mechanism 127 is located in the through hole 1253 , when the battery cell 12 thermally runs away, the first insulating member 125 will not block the pressure relief mechanism 127 , which can make the pressure relief of the battery cell 12 smoother and help improve the reliability of the battery cell 12 .

[0169] According to some embodiments of the present application, please refer to FIG. 12 . The present application provides a battery 100 including the battery cell 12 described in one or more of the above-mentioned solutions.

[0170] In the above solutions, since the battery cells 12 in one or more of the above solutions have high reliability, the battery 100 including the battery cells 12 in one or more of the above solutions also has high reliability.

[0171] According to some embodiments of the present application, referring to FIG. 4 , a battery 100 is provided, comprising a housing 11, a housing assembly 13, and a plurality of battery cells 12 according to one or more of the above-described embodiments. The housing assembly 13 is disposed within the housing 11. The plurality of battery cells 12 are disposed within the housing 11. The housing assembly 13 connects the first exposed areas 12133 of the plurality of battery cells 12.

[0172] In the above solutions, since the battery cells 12 in one or more of the above solutions have high reliability, the battery 100 including the battery cells 12 in one or more of the above solutions also has high reliability.

[0173] According to some embodiments of the present application, please refer to FIG. 1 . The present application provides an electrical device, which includes a battery 100 according to one or more of the above-mentioned solutions, and the battery 100 is used to provide electrical energy.

[0174] In the above solutions, since the battery 100 in one or more of the above solutions has high reliability, the electrical equipment including the battery 100 in one or more of the above solutions also has high reliability.

[0175] According to some embodiments of the present application, referring to Figures 4 to 9, the present application provides a battery cell 12, which includes a shell 121, a first insulating member 125, a second insulating member 126, an electrode terminal 123 and a pressure relief mechanism 127. The shell 121 includes an end cover 1211 and a shell 1212. The shell 1212 has an opening, and the end cover 1211 closes the opening.

[0176] The end cap 1211 has a first edge 12131 and a second edge 12132 adjacent to each other. The first insulating member 125 covers the outer surface of the end cap 1211. The second insulating member 126 includes a main body 1260, a first flange 1261, and a second flange 1262. The main body 1260 covers the outer surface of the side housing 1212. The first flange 1261 and the second flange 1262 are disposed on the outer surface of the end cap 1211. The first flange 1261 is disposed along the first edge 12131, and the second flange 1262 is disposed along the second edge 12132. The first flange 1261 has a first side 12611 away from the main body 1260, and the second flange 1262 has a second side 12621 away from the main body 1260. The first insulating member 125 covers the first side 12611 and the second side 12621. The first insulating member 125 is provided with a first hollow area 1251. The end cap 1211 forms a first exposed area 12133 at a position corresponding to the first hollow area 1251. The first exposed area 12133 is used to connect to the box assembly 13. The electrode terminal 123 is provided on the end cap 1211. The electrode terminal 123 is provided through the first hollow area 1251, and the first exposed area 12133 is provided adjacent to the electrode terminal 123. Two electrode terminals 123 are provided, and the two electrode terminals 123 are spaced apart along the first direction X. Two first exposed areas 12133 are provided, and the two first exposed areas 12133 correspond one-to-one to the two electrode terminals 123. Along the first direction X, the first exposed area 12133 is located on the side of the corresponding electrode terminal 123 away from the other electrode terminal 123. The pressure relief mechanism 127 is disposed on the end cover 1211 . The first insulating member 125 is provided with a through hole 1253 . Along the thickness direction of the end cover 1211 , the projection of the pressure relief mechanism 127 is located in the through hole 1253 .

[0177] After the battery cell 12 is wrapped with the second insulating member 126 , the first insulating member 125 is attached. The first insulating member 125 covers the first side 12611 and the second side 12621 , which can reduce the risk of the first flange portion 1261 and the second flange portion 1262 warping, thereby improving the insulation performance of the battery cell 12 and further improving the reliability of the battery cell 12 .

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall, a second wall and a side wall, wherein the second wall is arranged opposite to the first wall along the thickness direction of the first wall, the side wall is arranged around the first wall and the second wall, and the first wall has a first edge and a second edge adjacent to each other; a first insulating member covering an outer surface of the first wall; a second insulating member, the second insulating member comprising a main body, a first flange portion, and a second flange portion, the main body covering the outer surface of the side wall, the first flange portion and the second flange portion being arranged on the outer surface of the first wall, the first flange portion being arranged along the first edge, and the second flange portion being arranged along the second edge; Wherein, the first insulating member covers at least a portion of the first flange portion and at least a portion of the second flange portion.

2. The battery cell according to claim 1, wherein: The first flange portion and the second flange portion form an overlapping area at a corner of the first edge and the second edge, and the first insulating member covers the overlapping area.

3. The battery cell according to claim 1 or 2, characterized in that: The first flange portion has a first side away from the main body portion, the second flange portion has a second side away from the main body portion, and the first insulating member covers the first side and the second side.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first insulating member is provided with a first hollow area, and the first wall forms a first exposed area at a position corresponding to the first hollow area, and the first exposed area is used to be connected to the box assembly.

5. The battery cell according to claim 4, characterized in that The battery cell further includes an electrode terminal, and the electrode terminal is disposed on the first wall; The first insulating member is further provided with a second hollow area, and the electrode terminal is passed through the second hollow area.

6. The battery cell according to claim 5, characterized in that The second hollow area is connected to the first hollow area.

7. The battery cell according to claim 5 or 6, characterized in that: There are two electrode terminals, and the two electrode terminals are spaced apart along the first direction. There are two first exposed areas, and the two first exposed areas correspond one-to-one to the two electrode terminals. Along the first direction, the first exposed area is located on the side of the corresponding electrode terminal away from the other electrode terminal.

8. The battery cell according to claim 7, characterized in that Along the first direction, the size of the first exposed area is H3, which satisfies: 10 mm ≤ H3 ≤ 30 mm.

9. The battery cell according to claim 7 or 8, characterized in that: The first edge extends along the second direction, the second edge extends along the first direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other; In the first direction, the size of the first flange portion is H2, and the minimum distance between the edge of the first insulating member and the first exposed area is H1, satisfying: H1-H2≥2mm.

10. The battery cell according to claim 9, characterized in that 1mm≤H2≤5mm.

11. The battery cell according to claim 9 or 10, characterized in that: 3mm≤H1≤7mm.

12. The battery cell according to any one of claims 7 to 11, characterized in that: The first edge extends along the second direction, the second edge extends along the first direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other; In the second direction, the size of the second flange portion is W1, and the minimum distance between the edge of the first insulating member and the first exposed area is W2, satisfying: W2-W1≥2mm.

13. The battery cell according to claim 12, characterized in that: 1mm≤W1≤5mm.

14. The battery cell according to claim 12 or 13, characterized in that: 3mm≤W2≤7mm.

15. The battery cell according to any one of claims 5 to 14, characterized in that: The second hollow area is spaced apart from the first hollow area.

16. The battery cell according to any one of claims 1 to 15, characterized in that: The second wall and the side wall are integrally formed. Along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening. The first wall is an end cover that closes the opening.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The main body also covers the outer surface of the second wall. The main body is provided with a third hollow area. The second wall forms a second exposed area at a position corresponding to the third hollow area. The second exposed area is used to connect with the box body.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The battery cell further includes a pressure relief mechanism, which is disposed on the first wall. The first insulating member is provided with a through hole, and a projection of the pressure relief mechanism is located within the through hole along the thickness direction of the first wall.

19. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 3 and 16 to 18.

20. A battery, characterized in that: include: Box; A box assembly is arranged in the box; A plurality of battery cells according to any one of claims 4 to 15, disposed in the box; Wherein, the box assembly is connected to the first exposed areas of a plurality of the battery cells.

21. An electrical device, characterized in that: The electrical device comprises the battery according to claim 19 or 20, and the battery is used to provide electrical energy.

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