Battery monomer, battery device and electric equipment

Abstract

The utility model belongs to the technical field of battery production, and provides a battery monomer, a battery device and electric equipment.The battery monomer comprises an electrode assembly and an insulating film, the insulating film comprises an end piece body, two first piece bodies and two second piece bodies, and the end piece body is provided with two first edge sides and two second edge sides; wherein the two first sheet bodies are oppositely bent relative to the end sheet body by taking the first edge sides as folded edges, the two second sheet bodies are oppositely bent relative to the end sheet body by taking the second edge sides as folded edges, so that the end sheet body, the two first sheet bodies and the two second sheet bodies are enclosed to form a containing cavity, and the third edge sides are perpendicular to the first edge sides and the second edge sides; the first end of the electrode assembly is sleeved with the containing cavity. The insulating film provided by the utility model is seamless, and can effectively improve the lap-joint short circuit phenomenon caused by cyclic charge-discharge expansion of the electrode assembly, thereby further improving the coating property of the insulating film on the electrode assembly.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery cell, a battery device and an electrical equipment. Background Art

[0002] During the battery assembly process, there is a shelling process after the electrode assembly is completed. In order to protect the electrode assembly and perform insulation function, a layer of insulating film will be coated on the outer surface of the electrode assembly, and the insulating film will be attached to each surface of the electrode assembly.

[0003] However, the current insulating layer is not closed, and there are pores on the side after folding. The electrode assembly expands after multiple cycles of charge and discharge, and the bottom of the electrode assembly easily breaks through the pores and leaks out of the insulating film, eventually causing a short circuit between the electrode assembly and the metal shell. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell, a battery device and an electrical equipment, aiming to solve the technical problem of poor coating of the insulating film on the electrode assembly in the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] case;

[0007] an electrode assembly; located in the housing, the electrode assembly comprising an electrode body and a tab, the electrode body having a first end and a second end disposed opposite to the first end, the tab being connected to the electrode body and extending from the second end, and,

[0008] an insulating film, located in the housing, the insulating film comprising an end sheet, two first sheets and two second sheets, the end sheet having two first edges arranged opposite to each other and two second edges respectively connected to the two first edges, the two first sheets being respectively connected to the corresponding first edges, each of the first sheets having a third edge arranged opposite to each other and connected to the first edges, and the two second sheets being respectively connected to the corresponding second edges and the third edges;

[0009] The end sheet is covered on the first end of the electrode body, the two first sheets are bent toward each other relative to the end sheet with the first edge as the folding edge, and the two second sheets are bent toward each other relative to the end sheet with the second edge as the folding edge, so that the end sheet, the two first sheets and the two second sheets are surrounded to form a containing cavity, and the electrode body is arranged in the containing cavity;

[0010] The second sheet body includes a middle sheet portion and two edge sheets, the middle sheet portion corresponds to the end sheet body and is connected to the second edge side, the edge sheets respectively correspond to the first sheet body and are connected to the third edge side, and the middle sheet portion and the two edge sheets are folded to form the side wall of the accommodating cavity;

[0011] The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are respectively connected to the corresponding fourth edge sides; wherein the two edge sheets are respectively folded along with the corresponding first sheet to form the side wall of the accommodating cavity, and the middle sheet is folded in half and then folded and connected to the two folded edge sheets; or,

[0012] The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are respectively connected to the corresponding fourth edge sides; wherein the two edge sheets are folded in half so that the middle sheet is folded over to form the side wall of the accommodating cavity, and the two folded edge sheets are connected to the folded middle sheet; or,

[0013] The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are separated from the corresponding fourth edge sides respectively; wherein the two edge sheets are folded along with the corresponding first sheet to form the side wall of the accommodating cavity, and the middle sheet is folded and connected to the two folded edge sheets; or,

[0014] The middle piece has two fourth edge sides arranged opposite to each other, and the two edge pieces are respectively connected to the corresponding fourth edge sides; wherein each edge piece is provided with a cutting line, and each edge piece is divided into a first edge sub-section and a second edge sub-section by the corresponding cutting line, the first edge sub-section is connected to the middle piece, and the second edge sub-section is connected to the first sheet body; the first edge sub-section is connected to the first sheet body by folding, and the second edge sub-section is connected to the middle piece by folding.

[0015] The beneficial effects of the utility model are as follows: the battery cell provided by the utility model does not need to be provided with a process notch on its insulating film, and the two first sheets and the two second sheets of the insulating film are connected end to end, and each first sheet and each second sheet is connected to the end sheet, so after each first sheet and each second sheet is folded relative to the end sheet, there is no gap between the first sheet and the adjacent second sheet, therefore, placing the first end of the electrode assembly in the enclosed accommodating cavity can effectively improve the overlapping short circuit phenomenon caused by the expansion of the electrode assembly due to cyclic charge and discharge, thereby further improving the covering property of the insulating film on the electrode assembly; at the same time, the second sheet is folded to form the side wall of the accommodating cavity, and the connection between the side walls of the accommodating cavity is seamless, thereby improving the insulation property of the first end of the electrode assembly.

[0016] In some embodiments, the middle sheet has two first fold lines, one end of the first fold line intersects at the connection between the first edge side and the second edge side, and the other end of the first fold line is inclined away from the fourth edge side.

[0017] By adopting the above technical solution, the middle sheet is folded according to the two first folding lines to form the side wall of the accommodating cavity.

[0018] In some embodiments, the middle sheet is provided with a first through hole structure for communicating with the electrolyte; and / or, the two edge sheets are provided with a second through hole structure for communicating with the electrolyte.

[0019] By adopting the above technical solution, since the middle sheet is folded and has an overlapping portion with the edge sheet, a through-hole structure is provided in the middle sheet and the edge sheet, which is beneficial for the electrolyte to flow into the accommodating cavity and improve the wetting efficiency of the electrode assembly.

[0020] In some embodiments, the middle piece includes two first sub-pieces and one second sub-piece divided by two first folding lines, the two first sub-pieces are provided with the first through hole structure, the second through hole structure is provided on the part where the folded edge piece overlaps with the corresponding first sub-piece, and the first through hole structure is connected to the second through hole structure.

[0021] By adopting the above technical solution, the first sub-piece portion overlaps with the edge piece portion, and therefore, a first through-hole structure is arranged on the first sub-piece portion, and a second through-hole structure is arranged on the edge piece portion, and the first through-hole structure is connected with the second through-hole structure, which is more conducive to the electrolyte flowing into the accommodating cavity.

[0022] In some embodiments, the middle sheet has two fourth edge sides that are oppositely disposed, and the two edge sheets are respectively connected to the corresponding fourth edge sides;

[0023] The two edge sheets are folded in half so that the middle sheet is folded over to form a side wall of the accommodating cavity enclosing the end sheet, and the two folded edge sheets are connected to the folded middle sheet.

[0024] By adopting the above technical solution, similarly, in order to meet the requirements of forming a receiving cavity together with the first sheet and the end sheet, the second sheet is folded and formed to form the side walls of the receiving cavity; specifically, the middle sheet is folded along with the first sheet to form the side walls of the receiving cavity, and at the same time, the two edge sheets are folded in half and connected to the middle sheet, so that there is no gap at the connection between the side walls of the receiving cavity, thereby improving the insulation of the first end of the electrode assembly.

[0025] In some embodiments, the edge piece has a second fold line, one end of the second fold line intersects at a connection point between the first edge side and the second edge side, and the other end of the second fold line extends outward at an angle.

[0026] By adopting the above technical solution, the edge piece is folded in half according to the second folding line to form the side wall of the accommodating cavity.

[0027] In some embodiments, the middle sheet is provided with a first through hole structure for communicating with the electrolyte; and / or, the two edge sheets are provided with a second through hole structure for communicating with the electrolyte.

[0028] By adopting the above technical solution, since the edge sheet is folded in half and has an overlapping portion with the middle sheet, a through-hole structure is provided in the middle sheet and the edge sheet, which is beneficial for the electrolyte to flow into the accommodating cavity and improve the wetting efficiency of the electrode assembly.

[0029] In some embodiments, the second through hole structure is provided on the two edge pieces, and the first through hole structure is provided on the overlapping portion of the folded middle piece and the folded edge piece, and the second through hole structure is connected to the first through hole structure.

[0030] By adopting the above technical solution, the part where the middle sheet and the edge sheet overlap, therefore, a first through hole structure is set on the middle sheet, and a second through hole structure is set on the edge sheet, and the first through hole structure is connected to the second through hole structure, which is more conducive to the electrolyte flowing into the accommodating cavity and improves the wetting efficiency of the electrode assembly.

[0031] In some embodiments, a first through-hole structure for allowing electrolyte to flow is provided on the middle sheet.

[0032] By adopting the above technical solution, there is an overlapping portion between the middle sheet and the two folded edge sheets. Therefore, opening a first through hole structure on the middle sheet is more conducive to the electrolyte flowing into the accommodating cavity, thereby improving the wetting efficiency of the electrode assembly.

[0033] In some embodiments, a third through hole structure for allowing electrolyte to flow is provided on the end sheet and / or the first sheet.

[0034] By adopting the above technical solution, a third through hole structure is opened on the end sheet and / or the first sheet to allow the electrolyte to flow into the accommodating cavity.

[0035] In a second aspect, the present application provides a battery device, comprising the battery cell described above.

[0036] In a third aspect, the present application provides an electrical device, comprising a battery device as described above, wherein the battery device is used to store or provide electrical energy.

[0037] It can be understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0038] 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, it can be implemented in accordance with the contents of the specification. In order to make the above and 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

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0042] Figure 3 An exploded view of a battery cell provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the structure of the insulating film of the battery cell provided in Example 1 of the present application;

[0044] Figure 5 A schematic diagram of the structure of the insulating film of the battery cell provided in the second embodiment of the present application;

[0045] Figure 6 A schematic diagram of the structure of the insulating film of the battery cell provided in the third embodiment of the present application;

[0046] Figure 7 This is a schematic diagram of the structure of the insulating film of the battery cell provided in Example 4 of the present application.

[0047] Description of reference numerals:

[0048] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0049] 10. Battery cells;

[0050] 11, electrode assembly; 11a, first end; 11b, second end; 111, electrode body; 112, electrode ear;

[0051] 12, insulating film; 121, end sheet; 122, first sheet; 123, second sheet; 12a, first edge; 12b, second edge; 12c, third edge; 1231, middle sheet; 1232, edge sheet; 12d, fourth edge; 12e, first fold line; 12311, first sub-sheet; 12312, second sub-sheet; 12f, second fold line; 12g, first through-hole structure; 12h, second through-hole structure; 12i, third through-hole structure; 12j, cutting line; 12321, first edge sub-section; 12322, second edge sub-section;

[0052] 13. Shell;

[0053] 20. Box body; 21. First part; 22. Second part. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application will be described in detail in conjunction with 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 cannot be used to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0057] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] 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).

[0060] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] The battery device may include one or more battery cells for providing voltage and capacity. A plurality of battery cells form a battery cell assembly, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0063] The battery device may be a battery pack, which generally includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0064] A battery cell generally includes a positive electrode sheet, a negative electrode sheet, a separator and a shell. The positive electrode sheet, the negative electrode sheet and the separator are assembled into an electrode assembly by winding or stacking. The electrode assembly is placed in the shell and injected with electrolyte to form a battery cell.

[0065] Before the electrode assembly is assembled into the shell, an insulating film needs to be coated on the outer surface of the electrode assembly to isolate the electrode assembly and the shell to achieve the purpose of insulation. However, the conventional insulating film needs to be cut and then folded to fit the various surfaces of the electrode assembly. Therefore, the formed insulating film has gaps at the side wall surface of the corresponding electrode assembly. The electrode assembly expands after a certain number of charge and discharge cycles, especially the first end of the electrode assembly is easy to exceed the gap, and finally overlaps with the shell and shorts.

[0066] In view of this, the present application provides a battery cell, wherein the insulating film thereof, before being formed, comprises an end sheet, two first sheets and two second sheets, the end sheet having two first edge sides arranged opposite to each other and two second edge sides respectively connected to the two first edge sides, the two first sheets being respectively connected to the corresponding first edge sides, each first sheet having a third edge side arranged opposite to each other and connected to the first edge side, and the two second sheets being respectively connected to the corresponding second edge side and the third edge side. After forming, the first sheet and the second sheet of the insulating film are connected at the third edge side, i.e., they are integrated, and therefore, there is no gap there, i.e., the insulating film after forming is a closed structure, and thus, the overlapping short circuit phenomenon caused by the expansion of the electrode assembly due to cyclic charge and discharge can be effectively improved, thereby further improving the covering property of the insulating film on the electrode assembly.

[0067] Please refer to Figure 2 , the embodiment of the present application also provides a battery device 100, which includes one or more battery cell assemblies. The battery device 100 disclosed in the embodiment of the present application can be used for electrical equipment that uses the battery device 100 as a power source or various energy storage devices and energy storage systems that use the battery device 100 as an energy storage element. Electrical equipment can be, but is not limited to, mobile phones, portable devices, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0068] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0069] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0070] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0071] According to some embodiments of this application, please refer to Figures 3 to 6 An embodiment of the present application provides a battery cell 10 , including a shell 13 , an electrode assembly 11 and an insulating film 12 .

[0072] The shell 13 should have a receiving cavity for receiving components such as the electrode assembly 11 and the insulating film 12. The shell 13 may include a shell body and an end cover. The shell body is a hollow structure with one end open. The end cover is arranged at the opening of the shell body to define the receiving cavity together with the shell body.

[0073] The electrode assembly 11 is disposed in the housing 13. The electrode assembly 11 includes an electrode body 111 and a tab 112. The electrode body 111 has a first end 11a and a second end 11b disposed opposite to the first end 11a. The tab 112 is connected to the electrode body 111 and extends out of the second end 11b. The second end 11b of the electrode body 111 faces the end cap. The electrode terminal is disposed on the end cap and is electrically connected to the tab 112.

[0074] It can be understood that the first end 11a and the second end 11b are arranged opposite to each other and are also the two ends of the electrode assembly 11 in a normal placement state, wherein the first end 11a should correspond to the bottom of the shell 13 of the battery cell 10, and the second end 11b should correspond to the top cover of the battery cell 10.

[0075] The insulating film 12 includes an end sheet 121, two first sheets 122 and two second sheets 123. The end sheet 121 has two first edge sides 12a arranged opposite to each other and two second edge sides 12b respectively connected to the two first edge sides 12a. The two first sheets 122 are respectively connected to the corresponding first edge sides 12a. Each first sheet 122 has a third edge side 12c arranged opposite to each other and connected to the first edge side 12a. The two second sheets 123 are respectively connected to the corresponding second edge side 12b and the third edge side 12c.

[0076] Among them, the end sheet 121 is covered on the first end 11a of the electrode body 111, the two first sheets 122 are bent toward each other relative to the end sheet 121 with the first edge side 12a as the folding edge, and the two second sheets 123 are bent toward each other relative to the end sheet 121 with the second edge side 12b as the folding edge, so that the end sheet 121, the two first sheets 122 and the two second sheets 123 are enclosed to form a accommodating cavity, and the electrode body 111 is arranged in the accommodating cavity.

[0077] It can be understood that the insulating film 12 has an unformed state and a formed state. When the two first sheets 122 and the two second sheets 123 are bent relative to the end sheet 121, the insulating film 12 is in a formed state and can be sleeved on the first end 11a of the electrode assembly 11. When the two first sheets 122 and the two second sheets 123 are in the same plane as the end sheet 121, the insulating film 12 is in a flat state, that is, in an unformed state.

[0078] Here, the end sheet 121 and each first sheet 122 are connected as an integral structure, and each second sheet 123 is connected as an integral structure to the end sheet 121 and the first sheet 122. Therefore, the two first sheets 122 and the two second sheets 123 are arranged around the end sheet 121, and become a three-dimensional structure after folding. There is no gap at the connection between the first sheet 122 and the adjacent second sheet 123. Since each first sheet 122 and each second sheet 123 are connected to the first edge side 12a and the second edge side 12b of the end sheet 121, after bending, there is no gap at the connection between each first sheet 122 and the end sheet 121, and there is no gap at the connection between each second sheet 123 and the end sheet 121, so the wrapping of the electrode assembly 11 is better.

[0079] Specifically, after the two first sheets 122 are bent with the first edge 12a as the folding edge, two side walls of the accommodating cavity are formed, and after the two second sheets 123 are bent with the second edge 12b as the folding edge, the other two side walls of the accommodating cavity are formed. Since the first edge 12a and the second edge 12b of the end sheet 121 are respectively connected to the first sheet 122 and the second sheet 123, and the third edge 12c of the first sheet 122 is connected to the second sheet 123, there is no gap between the side walls and between the side walls and the bottom surface of the formed insulating film 12.

[0080] The formed insulating film 12 is sleeved on the first end 11a of the electrode assembly 11, that is, the accommodating cavity is sleeved on the first end 11a of the electrode assembly 11, then, the two folded first sheets 122 and the two second sheets 123 respectively cover the circumference of the electrode assembly 11, and the end sheet 121 covers the bottom surface of the electrode assembly 11. A plastic structure is provided on the side of the end cover of the shell 13 facing the electrode assembly 11, and the two first sheets 122 and the two second sheets 123 can be hot-melt connected to the plastic structure to fix the insulating film 12 on the end cover.

[0081] The battery cell 10 provided by the utility model does not need to be provided with a process notch or the like in its insulating film 12, and the two first sheets 122 and the two second sheets 123 of the insulating film 12 are connected end to end, and each first sheet 122 and each second sheet 123 are connected to the end sheet 121. Therefore, after each first sheet 122 and each second sheet 123 are folded relative to the end sheet 121, there is no gap between the first sheet 122 and the adjacent second sheet 123. Therefore, placing the first end 11a of the electrode body 111 in the enclosed accommodating cavity can effectively improve the overlapping short circuit phenomenon caused by the expansion of the electrode assembly due to cyclic charge and discharge, thereby further improving the covering property of the insulating film on the electrode assembly.

[0082] Please refer to Figures 4 to 6 In some embodiments, the second sheet 123 includes a middle sheet portion 1231 and two edge sheets 1232. The middle sheet portion 1231 corresponds to the end sheet 121 and is connected to the second edge side 12b. The edge sheets 1232 correspond to the first sheet 122 and are connected to the third edge side 12c. The middle sheet portion 1231 and the two edge sheets 1232 are folded to form the side wall of the accommodating cavity.

[0083] It can be understood that in this example, the second sheet 123 is divided into three parts, a middle sheet 1231 located in the middle position and edge sheets 1232 located on the opposite sides of the middle sheet 1231, which correspond to the connecting end sheets 121 and the first sheet 122. Therefore, when the second sheet 123 is folded in various ways to form the side walls of the accommodating cavity, either only the middle sheet 1231 is folded accordingly to make the second sheet 123 form the side walls of the accommodating cavity; or only the two edge sheets 1232 are folded to make the second sheet 123 form the side walls of the accommodating cavity.

[0084] For example, Figure 4 As shown, the middle sheet 1231 is folded in half so that the shape of the middle sheet 1231 changes, and the two edge sheets 1232 are symmetrically arranged facing each other as the two first sheets 122 are folded. Then, the symmetrical middle sheet 1231 is turned over, and the two edge sheets 1232 are connected to finally form the side wall of the accommodating cavity.

[0085] For example, Figure 5 As shown, the edge sheet 1232 may be folded in half to allow the middle sheet 1231 to form the side wall of the accommodating cavity, and then the symmetrical edge sheet 1232 may be connected to the middle sheet 1231 to maintain the middle sheet 1231 in an upright position relative to the end sheet.

[0086] In this way, the second sheet 123 is folded to form the side wall of the accommodating cavity. Specifically, only the middle sheet can be folded to form the side wall of the accommodating cavity with the two edge sheets 1232, or only the two edge sheets can be folded to form the side wall of the accommodating cavity with the middle sheet.

[0087] Please refer to Figure 4 In some embodiments, the middle sheet 1231 has two fourth edge sides 12d arranged opposite to each other, and the two edge sheets 1232 are respectively connected to the corresponding fourth edge sides 12d;

[0088] The two edge sheets 1232 are folded along with the corresponding first sheet 122 to form the side walls of the accommodating cavity, and the middle sheet 1231 is first folded in half and then folded and connected to the two folded edge sheets 1232 .

[0089] It can be understood that after the first sheet 122 is bent with the first edge 12a as the folding edge, the third edge 12c of the first sheet 122 should be in an upright state, and therefore, the second sheet 123 needs to be folded accordingly to meet the requirement of enclosing and forming a accommodating cavity.

[0090] Specifically, the second sheet 123 is divided into three parts: a middle sheet 1231 and two edge sheets 1232, wherein the two edge sheets 1232 are connected to the third edge side 12c of the first sheet 122. Therefore, when the first sheet 122 is folded, they will be folded together with it. Finally, the edge sheet 1232 is folded together with the first sheet 122 to an erected state; since the two fourth edge sides 12d of the middle sheet 1231 are respectively connected to the two edge sheets 1232, the middle sheet 1231 needs to be folded in half to meet the requirement of being folded again and enclosed with the two folded edge sheets 1232 to form the side wall of the accommodating cavity.

[0091] In actual operation, the middle sheet 1231 should be folded in half first so that the two edge sheets 1232 are in an upright state along with the first sheet 122, and then the folded middle sheet 1231 is turned over to connect with the two turned over edge sheets 1232. Here, the folded middle sheet 1231 can be connected to the edge sheets 1232 by bonding or welding.

[0092] In this way, in order to meet the requirements of forming a accommodating cavity by enclosing the first sheet 122 and the end sheet 121, the second sheet 123 is folded and formed to form the side walls of the accommodating cavity, and the middle sheet 1231 is folded along with the first sheet 122 to form the side walls of the accommodating cavity. At the same time, the two edge sheets 1232 are folded in half and connected to the middle sheet 1231. In this way, there is no gap at the connection of the side walls of the accommodating cavity, thereby improving the insulation of the first end 11a of the electrode assembly 11.

[0093] Please refer to Figure 4 In some embodiments, the middle piece 1231 has two first fold lines 12e, one end of the first fold line 12e intersects at the connection between the first edge side 12a and the second edge side 12b, and the other end of the first fold line 12e is inclined away from the fourth edge side 12d.

[0094] It can be understood that the two first fold lines 12e of the middle piece 1231 are symmetrically arranged about the center line of the middle piece 1231, and the middle piece 1231 is folded at the two first fold lines 12e to form a triangular structure or a similar triangular structure. At this time, the folded middle piece 1231 uses the second edge side 12b as the folding edge toward the two edge pieces 1232 after folding.

[0095] Thus, the middle piece 1231 is folded along the two first folding lines 12 e to form the side walls of the accommodating cavity.

[0096] Please refer to Figure 4In some embodiments, a first through hole structure 12g for communicating with electrolyte is provided on the middle sheet 1231; and / or, a second through hole structure 12h for communicating electrolyte is provided on the two edge sheets 1232.

[0097] It can be understood that since the second sheet 123 needs to be folded before it can become the side wall of the accommodating cavity, the middle sheet 1231 and the edge sheet 1232 of the second sheet 123 will overlap to a certain extent. Therefore, a first through hole structure 12g is set on the middle sheet 1231; or, a second through hole structure 12h is set on the edge sheet 1232; or, both of the first through hole structure 12g is set on the middle sheet 1231 and the second through hole structure 12h is set on the edge sheet 1232, which are beneficial for the electrolyte to enter the accommodating cavity.

[0098] Here, the shapes of the first through hole structure 12g and the second through hole structure 12h include but are not limited to circular, square, strip, etc., and the aperture size of the first through hole structure 12g and the aperture size of the second through hole can also be adjusted according to actual needs. Of course, the aperture size of the first through hole structure 12g can be the same as the aperture size of the second through hole, or it can be different.

[0099] Thus, since the middle sheet 1231 is folded and has an overlapping portion with the edge sheet 1232 , a through-hole structure is provided in the middle sheet 1231 and the edge sheet 1232 , which is beneficial for the electrolyte to flow into the accommodating cavity.

[0100] Please refer to Figure 5 In some embodiments, the middle sheet 1231 includes two first sub-sheets 12311 and a second sub-sheet 12312 divided by two first folding lines 12e, the two first sub-sheets 12311 are provided with a first through hole structure 12g, and the second through hole structure 12h is provided on the overlapping portion of the folded edge sheet 1232 and the corresponding first sub-sheet 12311, and the first through hole structure 12g is connected to the second through hole structure 12h.

[0101] It can be understood that due to the division of the two first folding lines 12e, the middle sheet 1231 is divided into three parts, namely, two first sub-sheets 12311 and one second sub-sheet 12312, and after the two first sub-sheets 12311 are folded in half about the first folding line 12e, the two first sub-sheets 12311 overlap with the second sub-sheet 12312. Therefore, it is necessary to open a first through hole structure 12g on the two first sub-sheets 12311. At the same time, the folded middle sheet 1231 will also overlap with the folded edge sheet 1232. Therefore, a second through hole structure 12h is opened in the area of ​​the edge sheet 1232 that overlaps with the middle sheet 1231, which is beneficial to the circulation of electrolyte. Please refer to the figure for details. The area where the second through hole structure 12h is opened on the edge sheet 1232 in the figure is the area that overlaps with the middle sheet 1231. Furthermore, when the first through-hole structure 12g is connected to the second through-hole structure 12h, the conduction effect on the electrolyte is optimal.

[0102] In this way, the first sub-piece 12311 overlaps with the edge piece 1232, and therefore, a first through hole structure 12g is set on the first sub-piece 12311, and a second through hole structure 12h is set on the edge piece 1232, and the first through hole structure 12g is connected with the second through hole structure 12h, which is more conducive to the electrolyte flowing into the accommodating cavity.

[0103] Please refer to Figure 5 In some embodiments, the middle sheet 1231 has two fourth edge sides 12d arranged opposite to each other, and the two edge sheets 1232 are respectively connected to the corresponding fourth edge sides 12d;

[0104] The two edge sheets 1232 are folded in half to fold the middle sheet 1231 to form a side wall of the accommodating cavity enclosed by the end sheet 121 , and the two folded edge sheets 1232 are connected to the folded middle sheet 1231 .

[0105] It can be understood that in this embodiment, the two edge sheets 1232 of the second sheet 123 are folded in half, while the middle sheet 1231 is not folded. Similarly, since the two fourth edges 12d of the middle sheet 1231 are connected to the corresponding edge sheets 1232, after the edge sheets 1232 are folded and erected with the first sheet 122, the middle sheet 1231 is also folded and erected toward the end sheet 121 with the second edge 12b as the folded edge. Finally, the side wall of the accommodating cavity can be formed by connecting the two folded edge sheets 1232 to the folded middle sheet 1231. Here, the folded edge sheets 1232 can be connected to the middle sheet 1231 by bonding or welding.

[0106] Similarly, in order to form a receiving cavity by being surrounded by the first sheet 122 and the end sheet 121 , the second sheet 123 is folded and formed to form a side wall of the receiving cavity.

[0107] Please refer to Figure 5 In some embodiments, the edge sheet 1232 has a second fold line 12f, one end of the second fold line 12f intersects at the connection between the first edge side 12a and the second edge side 12b, and the other end of the second fold line 12f extends outward at an angle.

[0108] It can be understood that the two edge pieces 1232 are folded along the second folding line 12f to form a triangular structure or a quasi-triangular structure to meet the requirement of enclosing the middle piece 1231 to form the side wall of the accommodating cavity.

[0109] In this way, the edge piece 1232 is folded along the second folding line 12 f to form the side wall of the accommodating cavity.

[0110] Please refer to Figure 5 In some embodiments, a first through hole structure 12g for communicating with electrolyte is provided on the middle sheet 1231; and / or, a second through hole structure 12h for communicating electrolyte is provided on the two edge sheets 1232.

[0111] It can be understood that since the second sheet 123 needs to be folded before it can become the side wall of the accommodating cavity, the middle sheet 1231 and the edge sheet 1232 of the second sheet 123 will overlap to a certain extent. Therefore, a first through hole structure 12g is set on the middle sheet 1231; or, a second through hole structure 12h is set on the edge sheet 1232; or, both of the first through hole structure 12g is set on the middle sheet 1231 and the second through hole structure 12h is set on the edge sheet 1232, which are beneficial for the electrolyte to enter the accommodating cavity.

[0112] Here, the shapes of the first through hole structure 12g and the second through hole structure 12h include but are not limited to circular, square, strip, etc., and the aperture size of the first through hole structure 12g and the aperture size of the second through hole can also be adjusted according to actual needs. Of course, the aperture size of the first through hole structure 12g can be the same as the aperture size of the second through hole, or it can be different.

[0113] Thus, since the edge sheet 1232 is folded in half and has an overlapping portion with the middle sheet 1231 , a through-hole structure is provided in the middle sheet 1231 and the edge sheet 1232 , which is beneficial for the electrolyte to flow into the accommodating cavity.

[0114] Please refer to Figure 5In some embodiments, a second through hole structure 12h is provided on the two edge pieces 1232, and a first through hole structure 12g is provided on the overlapping portion of the folded middle piece 1231 and the folded edge piece 1232, and the second through hole structure 12h is connected to the first through hole structure 12g.

[0115] It can be understood that the two edge sheets 1232 are folded in half along the second folding line 12f to form a triangular structure or a quasi-triangular structure, and after being folded again, they overlap with the middle sheet 1231. Therefore, the overlapping requirement is also a triangular structure or a quasi-triangular structure. Please refer to the figure for details. The area where the first through-hole structure 12g is opened on the middle sheet 1231 in the figure is the area where the folded edge sheets 1232 overlap. Further, when the first through-hole structure 12g is connected to the second through-hole structure 12h, the electrolyte conduction effect is best.

[0116] In this way, the middle piece 1231 overlaps with the edge piece 1232, and therefore, a first through hole structure 12g is set on the middle piece 1231, and a second through hole structure 12h is set on the edge piece 1232, and the first through hole structure 12g is connected to the second through hole structure 12h, which is more conducive to the electrolyte flowing into the accommodating cavity.

[0117] Please refer to Figure 6 In some embodiments, the middle sheet portion 1231 has two fourth edge sides 12d arranged opposite to each other, and the two edge sheets are separated from the corresponding fourth edge sides 12d respectively;

[0118] The two edge sheets 1232 are folded along with the corresponding first sheet 122 to form side walls of the accommodating cavity enclosed by the end sheet 121 , and the middle sheet 1231 is folded and connected to the two folded edge sheets 1232 .

[0119] It can be understood that in this embodiment, the second sheet 123 also includes three parts, that is, a middle sheet 1231 and two edge sheets 1232. The difference is that the middle sheet 1231 and the two edge sheets 1232 are in a phase-separated state. Therefore, when the two edge sheets 1232 are bent and erected with the first sheet 122, a gap is first formed between the two edge sheets 1232. Then, the middle sheet 1231 uses the second edge side 12b as a folding edge to connect the two folded edge sheets 1232, and the gap is blocked. Here, the connection between the middle sheet 1231 and the edge sheets 1232 can be bonding or welding.

[0120] Of course, in the actual manufacturing process, the middle piece 1231 may be turned over first, and then the two edge pieces 1232 may be placed in an upright state and enclosed with the middle piece 1231 to form the side wall of the accommodating cavity.

[0121] Thus, in order to form a receiving cavity by being surrounded by the first sheet 122 and the end sheet 121 , the second sheet 123 is folded and formed to form the side wall of the receiving cavity.

[0122] Please refer to Figure 3 and Figure 4 In some embodiments, a first through hole structure 12g for electrolyte to flow is provided on the middle sheet 1231 .

[0123] It can be understood that after the first sheet 122 of the two edge sheets 1232 is folded to an upright state, the middle sheet 1231 covers the gap between the two edge sheets 1232. Therefore, the first through hole structure 12g is opened on the middle sheet 1231 to promote the electrolyte to flow into the accommodating cavity.

[0124] In this way, there is an overlapping portion between the middle sheet 1231 and the two folded edge sheets 1232 . Therefore, the first through hole structure 12g is provided on the middle sheet 1231 , which is more conducive to the electrolyte flowing into the accommodating cavity.

[0125] Please refer to Figure 7 In some embodiments, the middle sheet 1231 has two fourth edge sides 12d arranged opposite to each other, and the two edge sheets 1232 are respectively connected to the corresponding fourth edge sides 12d;

[0126] Each edge piece 1232 is provided with a cutting line 12j, and each edge piece 1232 is divided into a first edge sub-portion 12321 and a second edge sub-portion 12322 by the corresponding cutting line 12j. The first edge sub-portion 12321 is connected to the middle piece 1231, and the second edge sub-portion 12322 is connected to the first piece 122.

[0127] The first edge sub-portion 12321 is connected to the first sheet body 122 by being folded, and the second edge sub-portion 12322 is connected to the middle sheet portion 1231 by being folded.

[0128] It can be understood that the cutting line 12j is a trajectory line for cutting in the subsequent process. After being cut along the cutting line 12j, the edge piece 1232 is divided into two parts, wherein the first edge sub-portion 12321 is connected to the middle piece 1231, and the second edge sub-portion 12322 is connected to the first sheet 122. Therefore, when the middle piece 1231 and the first sheet 122 need to be folded relative to the end sheet 121 to form the side wall of the accommodating cavity, the cutting line 12j is required to be used as the dividing line. Moreover, after the middle piece 1231 and the first sheet 122 are in an upright state relative to the end sheet 121, the first edge sub-portion 12321 is connected to the first sheet 122, and the second edge sheet 1232 is connected to the middle piece 1231, thereby achieving the sealing of the gap at the connection between the middle piece 1231 and the first sheet.

[0129] Alternatively, if Figure 7 As shown, one end of the cutting line 12j intersects at the connection between the first edge 12a and the second edge 12b, and the other end of the cutting line 12j extends outward at an angle. In this way, the height of the first sheet 122 and the middle sheet 1231 folded and erected relative to the end sheet 121 can be maximized.

[0130] In this way, in order to meet the requirements of forming a accommodating cavity together with the first sheet 122 and the end sheet 121, the second sheet 123 is folded and formed to form the side walls of the accommodating cavity; and, specifically, the middle sheet 1231 is folded along with the first sheet 122 to form the side walls of the accommodating cavity, and the first edge sub-portion 12321 and the second edge sub-portion 12322 are respectively connected to the first sheet or the middle sheet 1231 along with the folding, so that there is no gap at the connection between the side walls of the accommodating cavity, thereby improving the bottom insulation of the electrode assembly.

[0131] Please refer to Figure 4 In some embodiments, a third through hole structure 12i for allowing electrolyte to flow is provided on the end sheet 121 and / or the first sheet 122 .

[0132] It is understandable that, according to actual use requirements, the third through hole structure 12i can be opened only on the end sheet 121, or the third through hole can be opened only on the first sheet 122, or the third through hole can be opened on both the end sheet 121 and the first sheet 122.

[0133] The shape of the third through hole structure 12i includes but is not limited to a circle, a square, a strip, etc.

[0134] Thus, a third through hole structure 12i is formed on the end sheet 121 and / or the first sheet 122 to allow the electrolyte to flow into the accommodating cavity.

[0135] Please refer to Figure 4In a specific embodiment, the battery cell 10 includes a shell 13 , an electrode assembly 11 and an insulating film 12 both located in the shell 13 .

[0136] The electrode assembly 11 includes an electrode body 111 and a tab 112 . The electrode body 111 has a first end 11 a and a second end 11 b opposite to the first end 11 a . The tab 112 is connected to the electrode body 111 and extends out of the second end 11 b .

[0137] The insulating film 12 includes an end sheet 121, two first sheets 122 and two second sheets 123. The end sheet 121 has two first edge sides 12a arranged opposite to each other and two second edge sides 12b respectively connected to the two first edge sides 12a. The two first sheets 122 are respectively connected to the corresponding first edge sides 12a. Each first sheet 122 has a third edge side 12c arranged opposite to each other and connected to the first edge side 12a. The two second sheets 123 are respectively connected to the corresponding second edge side 12b and the third edge side 12c.

[0138] Among them, the two first sheets 122 are bent toward each other relative to the end sheet 121 with the first edge side 12a as the folding edge, and the two second sheets 123 are bent toward each other relative to the end sheet 121 with the second edge side 12b as the folding edge, so that the end sheet 121, the two first sheets 122 and the two second sheets 123 are enclosed to form a accommodating cavity, the third edge side 12c is perpendicular to the first edge side 12a and the second edge side 12b, and the accommodating cavity is sleeved on the first end 11a of the electrode assembly 11.

[0139] The second sheet 123 includes a middle sheet 1231 and two edge sheets 1232. The middle sheet 1231 has two fourth edge sides 12d arranged opposite to each other. The two edge sheets are respectively connected to the corresponding fourth edge sides 12d. The middle sheet 1231 corresponds to the end sheet 121 and is connected to the second edge side 12b. Each edge sheet 1232 corresponds to the first sheet 122 and is connected to the third edge side 12c. The middle sheet 1231 has two first fold lines 12e. One end of the first fold line 12e intersects at the connection between the first edge side 12a and the second edge side 12b. The other end of the first fold line 12e is inclined away from the fourth edge side 12d.

[0140] The two edge sheets 1232 are folded along the corresponding first sheet 122 to form side walls of the accommodating cavity enclosed by the end sheet 121 . The middle sheet 1231 is folded along the first fold line 12e and then folded again to connect to the two folded edge sheets 1232 .

[0141] The middle piece 1231 includes two first sub-pieces 12311 and a second sub-piece 12312 divided by two first folding lines 12e. The two first sub-pieces 12311 are provided with a first through hole structure 12g. The second through hole structure 12h is provided on the overlapping part of the folded edge piece 1232 and the corresponding first sub-piece 12311. The first through hole structure 12g is connected to the second through hole structure 12h.

[0142] The end sheet 121 is provided with a third through hole structure 12i for allowing electrolyte to flow.

[0143] According to some embodiments of the present application, referring to Figure 2 As shown, the present application further provides a battery device 100 , and the battery device 100 includes the above-mentioned battery cell 10 .

[0144] The battery device 100 further includes a housing 20, wherein the housing 20 has a storage space inside, and a plurality of battery cells 10 are stored in the storage space. Figure 2 As shown, the box body 20 may include two parts, which are respectively referred to as the first part 21 and the second part 22. Please refer to Figures and Figures, which show the first part 21 of the box body 20. The first part 21 and the second part 22 may be connected by snapping, bonding, etc. to form a containing space. A plurality of battery cells 10 are connected in parallel, in series, or in a mixed combination and are placed in the box body formed by connecting the first part 21 and the second part 22. The shapes of the first part 21 and the second part 22 may be determined according to the shape formed by the combination of a plurality of battery cells 10.

[0145] According to some embodiments of the present application, referring to Figure 1 As shown, the present application further provides an electrical device, which includes the battery device 100 in the above embodiment, and the battery device 100 is used to store or provide electrical energy.

[0146] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 10, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0147] The example of the electrical equipment in the present application is based on the example of the battery device 100 described above. The example of the electrical equipment includes all the technical effects of the example of the battery device 100 described above, which will not be described in detail.

[0148] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: case; Electrode assembly; Located in the shell, the electrode assembly includes an electrode body and a tab, the electrode body having a first end and a second end disposed opposite to the first end, the tab is connected to the electrode body and extends out of the second end, and, an insulating film, located in the housing, the insulating film comprising an end sheet, two first sheets and two second sheets, the end sheet having two first edges arranged opposite to each other and two second edges respectively connected to the two first edges, the two first sheets being respectively connected to the corresponding first edges, each of the first sheets having a third edge arranged opposite to each other and connected to the first edges, and the two second sheets being respectively connected to the corresponding second edges and the third edges; The end sheet is covered on the first end of the electrode body, the two first sheets are bent toward each other relative to the end sheet with the first edge as the folding edge, and the two second sheets are bent toward each other relative to the end sheet with the second edge as the folding edge, so that the end sheet, the two first sheets and the two second sheets are surrounded to form a containing cavity, and the electrode body is arranged in the containing cavity; The second sheet body includes a middle sheet portion and two edge sheets, the middle sheet portion corresponds to the end sheet body and is connected to the second edge side, the edge sheets respectively correspond to the first sheet body and are connected to the third edge side, and the middle sheet portion and the two edge sheets are folded to form the side wall of the accommodating cavity; The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are respectively connected to the corresponding fourth edge sides; wherein the two edge sheets are respectively folded along with the corresponding first sheet to form the side wall of the accommodating cavity, and the middle sheet is folded in half and then folded and connected to the two folded edge sheets; or, The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are respectively connected to the corresponding fourth edge sides; wherein the two edge sheets are folded in half so that the middle sheet is folded over to form the side wall of the accommodating cavity, and the two folded edge sheets are connected to the folded middle sheet; or, The middle sheet has two fourth edge sides arranged opposite to each other, and the two edge sheets are separated from the corresponding fourth edge sides respectively; wherein the two edge sheets are folded along with the corresponding first sheet to form the side wall of the accommodating cavity, and the middle sheet is folded and connected to the two folded edge sheets; or, The middle piece has two fourth edge sides arranged opposite to each other, and the two edge pieces are respectively connected to the corresponding fourth edge sides; wherein each edge piece is provided with a cutting line, and each edge piece is divided into a first edge sub-section and a second edge sub-section by the corresponding cutting line, the first edge sub-section is connected to the middle piece, and the second edge sub-section is connected to the first sheet body; the first edge sub-section is connected to the first sheet body by folding, and the second edge sub-section is connected to the middle piece by folding.

2. The battery cell according to claim 1, characterized in that: The middle sheet has two first fold lines, one end of the first fold line intersects at the connection between the first edge side and the second edge side, and the other end of the first fold line is inclined away from the fourth edge side.

3. The battery cell according to claim 2, characterized in that: The middle sheet is provided with a first through hole structure for communicating with electrolyte; and / or the two edge sheets are provided with a second through hole structure for communicating with electrolyte.

4. The battery cell according to claim 3, characterized in that: The middle piece includes two first sub-pieces and one second sub-piece divided by two first folding lines, the two first sub-pieces are provided with the first through hole structure, the second through hole structure is provided on the part where the folded edge piece overlaps with the corresponding first sub-piece, and the first through hole structure is connected to the second through hole structure.

5. The battery cell according to claim 1, characterized in that: The edge piece has a second fold line, one end of the second fold line intersects at the connection between the first edge side and the second edge side, and the other end of the second fold line extends outward at an angle.

6. The battery cell according to claim 5, characterized in that: The middle sheet is provided with a first through hole structure for communicating with electrolyte; and / or the two edge sheets are provided with a second through hole structure for communicating with electrolyte.

7. The battery cell according to claim 6, characterized in that: The two edge sheets are provided with the second through hole structure, and the first through hole structure is provided on the overlapping portion of the folded middle sheet and the folded edge sheet, and the second through hole structure is connected with the first through hole structure.

8. The battery cell according to claim 1, characterized in that: The middle sheet is provided with a first through hole structure for electrolyte to flow through.

9. The battery cell according to any one of claims 1 to 8, characterized in that: A third through hole structure for allowing electrolyte to flow is provided on the end sheet and / or the first sheet.

10. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery device as claimed in claim 10.

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