Battery cell, battery device and electric device

Abstract

The utility model discloses a single battery, a battery device and an electric device. The single battery comprises a shell, an electrode assembly and an insulating protective film, the electrode assembly is arranged in the shell, the outer surface of the electrode assembly comprises a first surface, a second surface and a side wall surface, the outer surface of the electrode assembly is coated with the insulating protective film, the insulating protective film is located in the shell and comprises a first protective film and a second protective film, the first protective film comprises a first diaphragm and a first side wall diaphragm, and the second protective film comprises a second diaphragm and a second side wall diaphragm. The first protective film comprises a first membrane and a first side wall membrane, the second protective film comprises a second membrane and a second side wall membrane, the first surface is covered with the first membrane, the second surface is covered with the second membrane, the side wall surface is covered with the first side wall membrane and the second side wall membrane, and at least part of the first side wall membrane and at least part of the second side wall membrane are arranged in an overlapped mode. According to the battery monomer provided by the embodiment of the utility model, the electrochemical corrosion and short circuit risk between the electrode assembly and the shell is reduced, and the safety of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery monomer, battery device and electric device. BACKGROUND

[0002] In the related art, during the manufacturing process of the battery monomer, an insulating protective film (such as Mylar film) is usually coated on the outside of the electrode assembly of the battery monomer before the electrode assembly is put into the shell. During the process of assembling the electrode assembly to the shell, the damage of the shell to the electrode assembly can be reduced. After the electrode assembly is assembled into the shell of the battery monomer, the insulation between the electrode assembly and the shell can be achieved, thereby reducing the problems of electrochemical corrosion and insulation failure caused by the contact between the electrode assembly and the shell during the charging and discharging cycle.

[0003] However, due to the limitations of the coating method of the insulating protective film on the electrode assembly, the risk of contact between the electrode assembly and the shell is still high in the battery monomer structure of the related art, which causes the problems of electrochemical corrosion and short circuit risk between the electrode assembly and the shell due to contact. Therefore, how to optimize the coating method of the insulating protective film on the electrode assembly to further reduce the risk of contact between the electrode assembly and the shell is a technical problem to be solved. SUMMARY

[0004] In view of the above problems, the utility model provides a battery monomer, a battery device and an electric device, the contact risk of the electrode assembly of the battery monomer and the shell is low, the electrochemical corrosion and short circuit risk between the electrode assembly and the shell are reduced, and the safety of the battery monomer is improved.

[0005] The utility model provides a kind of battery monomer, comprising: shell;Electrode assembly, the electrode assembly is located in the shell, the outer surface of the electrode assembly includes first surface, second surface and side surface, the first surface and the second surface are oppositely arranged along the first direction, the side surface is connected between the first surface and the second surface;Insulating protective film, the insulating protective film is covered on the outer surface of the electrode assembly and is located in the shell, the insulating protective film includes first protective film and second protective film, the first protective film includes first membrane and first side membrane, the second protective film includes second membrane and second side membrane, the first membrane is covered on the first surface, the second membrane is covered on the second surface, the first side membrane is connected in the first membrane side along the first direction and close to the second surface, the second side membrane is connected in the second membrane side along the first direction and close to the first surface, the first side membrane and the second side membrane are covered on the side surface, and the first side membrane and the second side membrane are at least partially overlapped.

[0006] In the above technical solution, by setting the insulating protective film to include the first protective film and the second protective film, the first membrane of the first protective film is covered on the first surface of the electrode assembly, the first side membrane of the first protective film is covered on the side surface of the electrode assembly, the second membrane of the second protective film is covered on the second surface of the electrode assembly, and the second side membrane of the second protective film is covered on the side surface of the electrode assembly. Thus, each surface of the electrode assembly can be covered by the insulating protective film, so that each surface of the electrode assembly and the shell can be physically isolated by the insulating protective film, and the risk of electrochemical corrosion and short circuit caused by contact between each surface of the electrode assembly and the shell can be reduced.

[0007] By setting the insulating protective film to include the first protective film and the second protective film, the electrode assembly can be covered on each surface, and the joint can be reduced. The insulating protective film covers the electrode assembly more comprehensively and sufficiently, so that the electrode assembly and the shell are better insulated, the risk of contact between the electrode assembly and the shell is reduced, and the risk of electrochemical corrosion and short circuit between the electrode assembly and the shell is reduced, thereby improving the safety of the battery monomer.

[0008] In some embodiments, the first side membrane and the second side membrane are arranged around the side surface.

[0009] In the technical solution described above, by arranging the first side film piece and the second side film piece to surround the side surface, the first side film piece and the second side film piece can more fully cover the side surface, and the insulation effect between the side surface of the electrode assembly and the shell can be more fully improved.

[0010] In some embodiments, the edge of the first side film piece close to the second surface is a first side film edge, the edge of the second side film piece close to the first surface is a second side film edge, the first side film edge is located on the side of the second side film edge close to the second surface, and the second side film edge is located on the side of the first side film edge close to the first surface.

[0011] In the technical solution described above, by arranging the first side film edge on the side of the second side film edge close to the second surface and the second side film edge on the side of the first side film edge close to the first surface, in the first direction, the side surface can be covered by the insulation protective film, the risk of the side surface contacting the shell can be more fully reduced, and the overlapping area of the first side film and the second side film in the first direction can be increased, the risk of the exposed side surface of the joint of the first side film and the second side film contacting the shell can be more fully reduced, and the insulation protective film can more fully cover the electrode assembly.

[0012] In some embodiments, the first side film edge is arranged flush with the outer edge of the second surface, and / or the second side film edge is arranged flush with the outer edge of the first surface.

[0013] In the technical solution described above, by arranging the first side film edge flush with the outer edge of the second surface, in the first direction, the side surface can be covered by the first side film, and the risk of the side surface contacting the shell can be more fully avoided; by arranging the second side film edge flush with the outer edge of the first surface, in the first direction, the side surface can be covered by the second side film, the risk of the side surface contacting the shell can be more fully avoided, and the overlapping area between the first side film and the second side film can be increased, and the risk of the electrode assembly at the joint of the first side film and the second side film contacting the shell can be more fully reduced.

[0014] In some embodiments, the first side film piece is attached to the side surface, at least part of the second side film piece is attached to the outer surface of the first side film piece, and the unfolded area of the second side film piece is greater than the unfolded area of the first side film piece.

[0015] In the technical solution, by making the second side film piece at least partially adhere to the outer surface of the first side film piece, the second side film piece has a larger unfolded area than the first side film piece, so that the second side film piece can wrap the first side film piece, reducing the risk of the first side film and the second side film seam being exposed to contact with the shell, and the insulating protective film can more fully cover the electrode assembly.

[0016] In some embodiments, the overlapping portions of the first side film piece and the second side film piece are bonded by hot melt or by insulating adhesive.

[0017] In the technical solution, by bonding the overlapping portions of the first side film piece and the second side film piece by hot melt or by insulating adhesive, the connection between the first side film piece and the second side film piece can be more secure, reducing the risk of the first side film piece and the second side film piece moving relative to each other and causing the first side film and the second side film to separate and expose the side surface to contact with the shell, and more fully reducing the risk of the insulating protective film failing to protect the side surface.

[0018] In some embodiments, the side surface includes two first side surfaces arranged opposite each other in a second direction and two second side surfaces arranged opposite each other in a third direction; the first side film piece includes two first side film pieces connected to opposite sides of the first film piece in the second direction and two second side film pieces connected to opposite sides of the first film piece in the third direction, the third direction, the second direction and the first direction intersecting with each other; the second side film piece includes two third side film pieces connected to opposite sides of the second film piece in the second direction and two fourth side film pieces connected to opposite sides of the second film piece in the third direction; one of the first side film pieces and one of the third side film pieces are both covered on one of the first side surfaces, the other first side film piece and the other third side film piece are both covered on the other first side surface, and at least a portion of the first side film piece and the third side film piece on the same side are arranged in overlapping manner; one of the second side film pieces and one of the fourth side film pieces are both covered on one of the second side surfaces, the other second side film piece and the other fourth side film piece are both covered on the other second side surface, and at least a portion of the second side film piece and the fourth side film piece on the same side are arranged in overlapping manner.

[0019] In the above embodiments, by connecting two first side films on opposite sides of the first film along the second direction, connecting two second side films on opposite sides of the first film along the third direction, and connecting two third side films on opposite sides of the second film along the second direction, and connecting two fourth side films on opposite sides of the second film along the third direction, the four surrounding sides of the first surface and the second surface can be sufficiently covered, reducing the risk of the four surrounding sides of the first surface and the second surface being exposed from the joint of the insulation protective film and contacting the shell. By at least partially overlapping the first side film and the third side film on the same side, and at least partially overlapping the second side film and the fourth side film on the same side, the side surface in the first direction can be covered by the insulation protective film, improving the insulation between the electrode assembly and the shell.

[0020] In some embodiments, the first side film is attached to the first side surface, and at least part of the third side film on the same side is attached to the outer surface of the first side film; the second side film is attached to the second side surface, and at least part of the fourth side film on the same side is attached to the outer surface of the second side film.

[0021] In the above embodiments, by attaching the first side film to the first side surface, and at least part of the third side film on the same side to the outer surface of the first side film, the third side film on the same side can wrap the first side film, avoiding the first side film and the third side film from being separated to expose the first side surface to contact the shell, and making the insulation protective film more fully cover the electrode assembly; by attaching the second side film to the second side surface, and at least part of the fourth side film on the same side to the outer surface of the second side film, the second side film on the same side can wrap the fourth side film, avoiding the second side film and the fourth side film from being separated to expose the second side surface to contact the shell, and making the insulation protective film more fully cover the electrode assembly.

[0022] In some embodiments, the first side film completely covers the first side surface, and the third side film on the same side completely covers the first side film.

[0023] In the above embodiments, by making the first side film completely cover the first side surface, and the third side film on the same side completely cover the first side film, the first side surface in the first direction can be covered by the first side film, and the overlapping area of the first side film and the third side film is larger, and the first side film and the third side film more fully cover the first side surface.

[0024] In some embodiments, the second side film completely covers the second side surface, and the fourth side film on the same side completely covers the second side film.

[0025] In the above embodiment, by making the second side film completely cover the second side surface, and the fourth side film located at the same side completely cover the second side film, the second side surface can be covered by the second side film in the first direction, and the overlapping area of the second side film and the fourth side film is larger, and the covering of the first side surface by the second side film and the fourth side film is more sufficient.

[0026] In some embodiments, the fourth side film comprises a main body part and an extension part, the main body part covers the second side surface and is at least partially attached to the outer surface of the second side film, and the extension part covers the first side surface.

[0027] In the above embodiment, by making the main body part cover the second side surface and be at least partially attached to the outer surface of the second side film, the main body part can cover the second side film, reducing the risk of the second side film and the fourth side film being separated to expose the second side surface to contact the shell, and the insulation protection film can more fully cover the electrode assembly. By making the fourth side film comprise an extension part, the extension part covers the first side surface, the extension part can cover the gap between the fourth side film and the third side film, so that the connection between the first side surface and the second side surface is more fully insulated and protected, and the risk of the electrode assembly at the connection between the first side surface and the second side surface being exposed and contacting the shell through the joint between the fourth side film and the third side film is reduced.

[0028] In some embodiments, the first side film completely covers the first side surface, and the third side film located at the same side completely covers the first side film; the extension part covers the first side surface and is attached to the outer surface of the third side film.

[0029] In the above embodiment, by making the first side film completely cover the first side surface, and the third side film on the same side completely cover the first side film, the first side surface can be covered by the first side film in the first direction, and the overlapping area of the first side film and the third side film is larger, and the first side film and the third side film cover the first side surface more fully; by making the main body cover the second side surface and at least partially adhere to the outer surface of the second side film, the main body can cover the second side film, reducing the risk of the second side film and the fourth side film joint being exposed to contact with the shell, and the insulating protective film can more fully cover the electrode assembly; by making the extension cover the first side surface and adhere to the outer surface of the third side film, the extension can cover the gap between the fourth side film and the third side film, so that the connection between the first side surface and the second side surface is more fully insulated and protected, reducing the risk of the electrode assembly at the connection between the first side surface and the second side surface being exposed through the joint between the fourth side film and the third side film and contacting the shell.

[0030] In some embodiments, the electrode assembly includes an electrode body and a tab connected to one side of the electrode body along the first direction, and the first film is provided with a relief hole for avoiding the tab.

[0031] In the above embodiment, by providing the first film with a relief hole for avoiding the tab, the tab can be led out of the relief hole.

[0032] In some embodiments, the shell includes a top cover located on one side of the electrode assembly along the first direction and the first surface faces the top cover, the top cover is provided with a pole, the pole is connected with the tab, the inner side of the top cover has a plastic layer, and the first film is hot melt bonded with the plastic layer.

[0033] In the above embodiment, by providing the top cover with a pole connected with the tab, the electrical equipment can directly connect with the pole to use the electricity in the battery, which is convenient to use. By making the inner side of the top cover have a plastic layer, the plastic layer is an insulating structure, which can more fully maintain the insulation between the first surface and the top cover, and more fully reduce the risk of electrical contact between the first surface and the top cover. By making the first film hot melt bonded with the plastic layer, the first film and the plastic layer can be relatively fixed, and since the insulating protective film covers the electrode assembly, the electrode assembly can be fixed relative to the shell, reducing the risk of the electrode assembly moving in the shell to damage the insulating protective film and cause the electrode assembly to contact the shell.

[0034] In some embodiments, the housing is provided with a liquid injection hole, the first diaphragm is provided with a liquid inlet hole opposite to the liquid injection hole, the housing is provided with a pressure relief valve, the first diaphragm is provided with a vent hole, and at least a portion of the vent hole is disposed opposite to the pressure relief valve.

[0035] In the above embodiments, by providing an injection hole on the housing and an inlet hole on the first diaphragm opposite to the injection hole, personnel can inject electrolyte into the injection hole and allow the electrolyte to enter the electrode assembly through the inlet hole to replenish the electrode assembly. By providing a pressure relief valve on the housing and an vent hole on the first diaphragm, gas inside the electrode assembly can be discharged to the outside of the battery cell through the vent hole and then through the pressure relief valve, reducing the internal pressure of the battery cell and improving the safety of the battery cell. By arranging at least a portion of the vent hole opposite to the pressure relief valve, gas leaving the electrode assembly through this portion of the vent hole can leave the battery cell through the pressure relief valve via a shorter path, releasing the pressure inside the battery cell more quickly and more fully and promptly improving the safety of the battery cell.

[0036] In some embodiments, the first direction is the up-down direction, the second membrane is located below the first membrane, and the second membrane is provided with a liquid suction hole.

[0037] In the above embodiment, by providing liquid absorption holes on the second membrane located below, the electrolyte located on the bottom surface of the electrode assembly can enter the electrode assembly through the liquid absorption holes on the second membrane, so that the electrode assembly can more fully absorb and utilize the electrolyte.

[0038] Secondly, the present invention provides a battery device, comprising: a housing; and a battery cell according to the first aspect of the present invention disposed within the housing.

[0039] In the above technical solution, by including the battery cell according to the first aspect of the present invention in the battery device, the contact risk between the electrode assembly and the casing of the battery cell is lower, the electrochemical corrosion and short circuit risk between the electrode assembly and the casing are reduced, and the safety of the battery cell is improved.

[0040] Thirdly, this utility model provides an electrical device, including the battery device described in the second aspect of this utility model.

[0041] In the above technical solution, by using an electrical device including the battery device described in the second aspect of this utility model, the contact risk between the electrode assembly of the battery cell and the casing is low, reducing the electrochemical corrosion and short circuit risk between the electrode assembly and the casing, and improving the safety of the battery cell.

[0042] Additional aspects and advantages of the present application will be apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0044] Figure 1 is a schematic view of a battery cell according to some embodiments of the present application;

[0045] Figure 2 is a schematic view of an electrode assembly in Figure 1 cooperating with an insulating protective film;

[0046] Figure 3 is a schematic view of an electrode assembly in Figure 2

[0047] Figure 4 is an expanded view of a first protective film in Figure 2

[0048] Figure 5 is an expanded view of a second protective film in Figure 2

[0049] Figure 6 is a schematic view of a battery device according to some embodiments of the present application;

[0050] Figure 7 is a schematic view of an electric device according to some embodiments of the present application.

[0051] REFERENCE NUMERALS:

[0052] 100, electric device;

[0053] 101, battery device; 1011, box body;

[0054] 102, battery cell;

[0055] 10, housing; 11, top cover; 12, pole; 13, liquid injection hole; 14, pressure relief valve;

[0056] 20, electrode assembly; 21, first surface; 22, second surface; 23, side surface; 24, first side surface; 25, second side surface; 26, electrode body; 27, tab;

[0057] ​​​30. Insulating protective film; 31. First protective film; 32. First diaphragm; 34. Clearance hole; 35. Vent hole; 36. Liquid inlet hole; 37. First side membrane; 38. Edge of first side membrane; 39. First side membrane; 40. Second side membrane; 41. Second protective film; 42. Second diaphragm; 43. Liquid suction hole; 44. Second side membrane; 45. Edge of second side membrane; 46. Third side membrane; 47. Fourth side membrane; 48. Main body; 49. Extension. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0059] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0060] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0061] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] The term "and / or", in the present utility model, is merely a description of the association relationship of the associated objects, and can represent three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present utility model generally represents an "or" relationship between the associated objects before and after it.

[0063] In the embodiments of the present utility model, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present utility model shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present utility model.

[0064] In the present utility model, "multiple" refers to two or more (including two).

[0065] In the embodiments of the present utility model, all the embodiments and optional embodiments of the present utility model can be combined with each other to form new technical solutions if not specifically stated.

[0066] In the embodiments of the present utility model, all the technical features and optional technical features of the present utility model can be combined with each other to form new technical solutions if not specifically stated.

[0067] In the embodiments of the present utility model, the battery apparatus can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component. For example, the battery cell assembly is usually formed by arranging a plurality of battery cells; the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0068] The battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body. The battery cell assembly can be a battery module, which can be accommodated in the box body by fixing the battery module in the box body; the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0069] In the embodiments of the utility model, the box can include a first box and a second box. The first box and the second box are buckled to form a closed space inside the box to accommodate the battery monomer assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate. For example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that a closed space is formed inside the box to accommodate the battery monomer assembly.

[0070] In the embodiments of the utility model, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0071] In the embodiments of the utility model, the battery monomer can be a secondary battery, which means that the battery monomer can be activated by charging after discharging to continue to be used; the battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc. The embodiments of the utility model are not limited in this regard. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the utility model are not limited in this regard. The battery monomer is generally divided into three types according to the packaging method: cylindrical battery monomers, square battery monomers and soft package battery monomers, and the embodiments of the utility model are not limited in this regard.

[0072] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0073] In the related art, during the manufacturing process of the battery monomer, an insulating protective film (such as Mylar film) is usually wrapped outside the electrode assembly before the electrode assembly is put into the shell. During the process of assembling the electrode assembly into the shell, the damage of the shell to the electrode assembly can be reduced, and after the electrode assembly is assembled into the shell of the battery monomer, the electrode assembly and the shell can be insulated, so that the problem of electrochemical corrosion caused by the contact between the electrode assembly and the shell during the charging and discharging cycle and the insulation failure can be reduced.

[0074] However, the battery monomer structure in the related art still has a high risk of contact between the electrode assembly and the shell due to the limitation of the wrapping mode of the insulating protective film on the electrode assembly, which still causes the problems of electrochemical corrosion and short circuit risk between the electrode assembly and the shell due to contact. Therefore, how to optimize the wrapping mode of the insulating protective film on the electrode assembly to further reduce the risk of contact between the electrode assembly and the shell is a technical problem to be solved.

[0075] Based on this, the utility model provides a kind of battery monomer, comprising: shell, electrode assembly and insulating protective film, electrode assembly is located in shell, the outer surface of electrode assembly includes first surface, second surface and side wall surface, first surface and second surface are oppositely arranged along first direction, side wall surface is connected between first surface and second surface;Insulating protective film, insulating protective film is wrapped in the outer surface of electrode assembly and is located in shell, insulating protective film includes first protective film and second protective film, first protective film includes first membrane and first side wall membrane, second protective film includes second membrane and second side wall membrane, first membrane is covered on first surface, second membrane is covered on second surface, first side wall membrane is connected in the side of first membrane along first direction and close to second surface, second side wall membrane is connected in the side of second membrane along first direction and close to first surface, first side wall membrane and second side wall membrane are covered on side wall surface, first side wall membrane and second side wall membrane are at least partially overlapped.

[0076] In the above battery monomer, by setting the insulating protective film to include the first protective film and the second protective film, the first membrane of the first protective film is covered on the first surface of the electrode assembly, the first side wall membrane of the first protective film is covered on the side wall surface of the electrode assembly, and the second membrane of the second protective film is covered on the second surface of the electrode assembly, and the second side wall membrane of the second protective film is covered on the side wall surface of the electrode assembly, so that each surface of the electrode assembly can be covered by the insulating protective film, so that each surface of the electrode assembly can be physically isolated from the shell by the insulating protective film, and the electrochemical corrosion and short circuit risk of each surface of the electrode assembly due to contact with the shell can be reduced. The risk of electrochemical corrosion and short circuit of the electrode assembly due to contact with the shell at the joint between the first side wall membrane and the second side wall membrane can be reduced or avoided.

[0077] By setting the insulation protective film to include the first protective film and the second protective film, the coating of each surface of the electrode assembly can be achieved, and the joint can be reduced. The insulation protective film is more comprehensive and sufficient for the coating of the electrode assembly, so that better insulation between the electrode assembly and the shell is achieved, the risk of contact between the electrode assembly and the shell can be reduced, thereby the risk of electrochemical corrosion and short circuit between the electrode assembly and the shell can be reduced, and the safety of the battery monomer can be improved.

[0078] The battery device disclosed in the embodiments of the utility model can be used in an electric device using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, notebook computers, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, and the like.

[0079] The electric device disclosed in the embodiments of the utility model can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or a range extender car, and the like. The vehicle is internally provided with a battery device, which can be arranged at the bottom, head, or tail of the vehicle. The battery device can be used for power supply of the vehicle, for example, the battery device can be used as an operating power supply of the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery device to supply power to the motor, for example, to meet the working power demand of the vehicle during starting, navigation, and driving. In some embodiments of the utility model, the battery device can not only be used as an operating power supply of the vehicle, but also be used as a driving power supply of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0080] Reference will be made to Figures 1-7 The battery monomer, the battery device, and the electric device according to the embodiments of the utility model are described.

[0081] Reference Figures 1-3The utility model provides a battery monomer 102, and the battery monomer 102 includes: casing 10, electrode assembly 20 and insulating protective film 30. The electrode assembly 20 is located in the casing 10, and the outer surface of the electrode assembly 20 includes first surface 21, second surface 22 and side wall surface 23, the first surface 21 and the second surface 22 are oppositely arranged along the first direction, and the side wall surface 23 is connected between the first surface 21 and the second surface 22. The insulating protective film 30 is covered on the outer surface of the electrode assembly 20 and is located in the casing 10, and the insulating protective film 30 includes first protective film 31 and second protective film 41, the first protective film 31 includes first membrane piece 32 and first side wall membrane piece 37, the second protective film 41 includes second membrane piece 42 and second side wall membrane piece 44, the first membrane piece 32 is covered on the first surface 21, the second membrane piece 42 is covered on the second surface 22, the first side wall membrane piece 37 is connected on the side of the first membrane piece 32 along the first direction and close to the second surface 22, the second side wall membrane piece 44 is connected on the side of the second membrane piece 42 along the first direction and close to the first surface 21, the first side wall membrane piece 37 and the second side wall membrane piece 44 are all covered on the side wall surface 23, and the first side wall membrane piece 37 and the second side wall membrane piece 44 are at least partially overlapped.

[0082] The first surface 21 and the second surface 22 are oppositely arranged along the first direction, that is, one side of the battery monomer 102 along the first direction is the first surface 21, and the other side along the first direction is the second surface 22.

[0083] The first side wall membrane piece 37 is connected on the side of the first membrane piece 32 along the first direction and close to the second surface 22, that is, along the first direction, the side of the first side wall membrane piece 37 close to the first membrane piece 32 is connected with the first membrane piece 32, and the side of the first side wall membrane piece 37 away from the first membrane piece 32 extends along the first direction to the direction of the second surface 22.

[0084] The second side wall membrane piece 44 is connected on the side of the second membrane piece 42 along the first direction and close to the first surface 21, that is, along the first direction, the side of the second side wall membrane piece 44 close to the second membrane piece 42 is connected with the second membrane piece 42, and the side of the second side wall membrane piece 44 away from the second membrane piece 42 extends along the first direction to the direction of the first surface 21.

[0085] The first side wall membrane piece 37 and the second side wall membrane piece 44 are all covered on the side wall surface 23, that is, the first side wall membrane piece 37 can cover part of the area of the side wall surface 23, or the first side wall membrane piece 37 can cover the whole side wall surface 23; similarly, the second side wall membrane piece 44 can cover part of the area of the side wall surface 23, or the second side wall membrane piece 44 can cover the whole side wall surface 23.

[0086] The at least partially overlapping arrangement of the first side film 37 and the second side film 44 means that a portion of the first side film 37 is arranged to overlap a portion of the second side film 44, or the first side film 37 and the second side film 44 are arranged to overlap entirely.

[0087] The first direction can refer to the e1 direction in the accompanying drawings.

[0088] By covering the first film 32 on the first surface 21, the insulation between the first surface 21 and the top of the shell 10 can be more sufficient.

[0089] By connecting the first side film 37 to the side of the first film 32 along the first direction and close to the second surface 22, the connection between the first surface 21 and the side surface 23 can be covered by the insulating protective film 30, avoiding the connection between the first surface 21 and the side surface 23 from contacting the shell 10 to cause a short circuit and a danger. By connecting the second side film 44 to the side of the second film 42 along the first direction and close to the first surface 21, the connection between the second surface 22 and the side surface 23 can be covered by the insulating protective film 30, avoiding the connection between the second surface 22 and the side surface 23 from contacting the shell 10 to cause a short circuit and a danger.

[0090] By covering the first side film 37 and the second side film 44 on the side surface 23, and the at least partially overlapping arrangement of the first side film 37 and the second side film 44, the first side film 37 and the second side film 44 can more fully cover the side surface 23, avoiding the existence of a joint between the first side film 37 and the second side film 44, which can cause the electrode assembly 20 at the joint to contact the shell 10 to cause a short circuit, more sufficiently ensuring the insulation between the electrode assembly 20 and the shell 10, and improving the safety of the battery monomer 102.

[0091] In the technical solution, the insulation protection film 30 is provided with the first protection film 31 and the second protection film 41, the first film sheet 32 of the first protection film 31 covers the first surface 21 of the electrode assembly 20, the first side wall film sheet 37 of the first protection film 31 covers the side wall surface 23 of the electrode assembly 20, the second film sheet 42 of the second protection film 41 covers the second surface 22 of the electrode assembly 20, and the second side wall film sheet 44 of the second protection film 41 covers the side wall surface 23 of the electrode assembly 20. In this way, each surface of the electrode assembly 20 can be covered by the insulation protection film 30, so that each surface of the electrode assembly 20 and the shell 10 can be physically isolated by the insulation protection film 30, and the risk of electrochemical corrosion and short circuit caused by the contact between the electrode assembly 20 and the shell 10 can be reduced. In addition, the first side wall film sheet 37 and the second side wall film sheet 44 overlap at least partially on the side wall surface 23, so that the risk of electrochemical corrosion and short circuit caused by the contact between the electrode assembly 20 and the shell 10 at the joint between the first side wall film sheet 37 and the second side wall film sheet 44 can be reduced or avoided.

[0092] The insulation protection film 30 is provided with the first protection film 31 and the second protection film 41, so that each surface of the electrode assembly 20 can be covered, and the joint can be reduced. The insulation protection film 30 can more comprehensively and sufficiently cover the electrode assembly 20, so that the insulation between the electrode assembly 20 and the shell 10 is better, the risk of contact between the electrode assembly 20 and the shell 10 is reduced, and the risk of electrochemical corrosion and short circuit between the electrode assembly 20 and the shell 10 is reduced, thereby improving the safety of the battery monomer 102.

[0093] In some embodiments, referring to Figure 2 and Figure 3 The first side wall film sheet 37 and the second side wall film sheet 44 are arranged around the side wall surface 23.

[0094] The first side wall film sheet 37 and the second side wall film sheet 44 are arranged around the side wall surface 23, which means that, in the circumferential direction of the first surface 21, the first film sheet 32 is connected to the first side wall film sheet 37, and the first side wall film sheet 37 covers at least part of the side wall surface 23; in the circumferential direction of the second surface 22, the second film sheet 42 is connected to the second side wall film sheet 44, and the second side wall film sheet 44 covers at least part of the side wall surface 23.

[0095] In the technical solution, the first side wall film sheet 37 and the second side wall film sheet 44 are arranged around the side wall surface 23, so that the first side wall film sheet 37 and the second side wall film sheet 44 can more fully cover the side wall surface 23 and more fully improve the insulation effect between the side wall surface 23 of the electrode assembly 20 and the shell 10.

[0096] In some embodiments, referring to Figures 2-5 , the edge of the first side membrane piece 37 close to the second surface 22 is a first side membrane edge 38, the edge of the second side membrane piece 44 close to the first surface 21 is a second side membrane edge 45, the first side membrane edge 38 is located on the side of the second side membrane edge 45 close to the second surface 22, and the second side membrane edge 45 is located on the side of the first side membrane edge 38 close to the first surface 21.

[0097] In the above technical solution, by locating the first side membrane edge 38 on the side of the second side membrane edge 45 close to the second surface 22 and locating the second side membrane edge 45 on the side of the first side membrane edge 38 close to the first surface 21, the side surface 23 can be more fully covered by the insulation protective film 30 in the first direction, and the risk of the side surface 23 contacting the shell 10 can be more fully reduced; and the overlapping area of the first side membrane and the second side membrane in the first direction can be increased, and the risk of the side surface 23 contacting the shell 10 due to the exposed joint of the first side membrane and the second side membrane can be more fully reduced, so that the electrode assembly 20 can be more fully covered by the insulation protective film 30.

[0098] In some embodiments, referring to Figure 2 , the first side membrane edge 38 is flush with the outer edge of the second surface 22; and / or, the second side membrane edge 45 is flush with the outer edge of the first surface 21.

[0099] For example, the first side membrane edge 38 is flush with the outer edge of the second surface 22.

[0100] For another example, the second side membrane edge 45 is flush with the outer edge of the first surface 21.

[0101] For yet another example, the first side membrane edge 38 is flush with the outer edge of the second surface 22, and the second side membrane edge 45 is flush with the outer edge of the first surface 21.

[0102] Wherein, the outer edge of the second surface 22 refers to the edge of the second surface 22 at the junction with the side surface 23; and the outer edge of the first surface 21 refers to the edge of the first surface 21 at the junction with the side surface 23.

[0103] In the technical solution, the first side film edge 38 is arranged flush with the outer edge of the second surface 22, so that the side surface 23 can be covered by the first side film in the first direction, and the side surface 23 can be more fully prevented from contacting the shell 10. The second side film edge 45 is arranged flush with the outer edge of the first surface 21, so that the side surface 23 can be covered by the second side film in the first direction, and the side surface 23 can be more fully prevented from contacting the shell 10. In addition, the overlapping area between the first side film and the second side film can be increased, and the risk of the electrode assembly 20 contacting the shell 10 at the junction of the first side film and the second side film can be more fully reduced.

[0104] In some embodiments, referring to Figure 2 and Figure 3 the first side film piece 37 is attached to the side surface 23, and at least part of the second side film piece 44 is attached to the outer surface of the first side film piece 37. The second side film piece 44 has a larger area than the first side film piece 37.

[0105] In the technical solution, at least part of the second side film piece 44 is attached to the outer surface of the first side film piece 37, and the second side film piece 44 has a larger area than the first side film piece 37. The second side film piece 44 can wrap the first side film piece 37, the risk of the exposed side surface 23 contacting the shell 10 at the joint of the first side film and the second side film can be reduced, and the insulating protective film 30 can more fully cover the electrode assembly 20.

[0106] In some embodiments, the overlapping part of the first side film piece 37 and the second side film piece 44 is bonded by hot melt or by insulating adhesive.

[0107] For example, the overlapping part of the first side film piece 37 and the second side film piece 44 is bonded by hot melt.

[0108] For another example, the overlapping part of the first side film piece 37 and the second side film piece 44 is bonded by insulating adhesive.

[0109] In the technical solution, the overlapping part of the first side film piece 37 and the second side film piece 44 is bonded by hot melt or by insulating adhesive, so that the connection between the first side film piece 37 and the second side film piece 44 can be more firm, the risk of the exposed side surface 23 contacting the shell 10 at the joint of the first side film and the second side film due to the relative movement of the first side film piece 37 and the second side film piece 44 can be reduced, and the risk of the insulating protective film 30 failing to protect the side surface 23 can be more fully reduced.

[0110] In some embodiments, referring to Figures 2-5The side surface 23 comprises two first side surfaces 24 oppositely arranged along a second direction and two second side surfaces 25 oppositely arranged along a third direction; the first side gusset 37 comprises two first side gussets 39 and two second side gussets 40, the two first side gussets 39 being connected to opposite sides of the first gusset 32 along the second direction, and the two second side gussets 40 being connected to opposite sides of the first gusset 32 along the third direction, the third direction, the second direction and the first direction intersecting with each other in pairs; the second side gusset 44 comprises two third side gussets 46 and two fourth side gussets 47, the two third side gussets 46 being connected to opposite sides of the second gusset 42 along the second direction, and the two fourth side gussets 47 being connected to opposite sides of the second gusset 42 along the third direction; one of the first side gussets 39 and one of the third side gussets 46 are both arranged on one of the first side surfaces 24, the other of the first side gussets 39 and the other of the third side gussets 46 are both arranged on the other of the first side surfaces 24, and at least a part of the first side gussets 39 and the third side gussets 46 on the same side are arranged in overlapping manner; one of the second side gussets 40 and one of the fourth side gussets 47 are both arranged on one of the second side surfaces 25, the other of the second side gussets 40 and the other of the fourth side gussets 47 are both arranged on the other of the second side surfaces 25, and at least a part of the second side gussets 40 and the fourth side gussets 47 on the same side are arranged in overlapping manner.

[0111] For example, the first side gusset 39, the first gusset 32 and the second side gusset 40 are integrally formed, wherein the first side gusset 39 is connected to the first gusset 32 and integrally formed, the second side gusset 40 is connected to the first gusset 32 and integrally formed, and the first side gusset 39 and the second side gusset 40 are in contact with each other but not connected.

[0112] For example, the third side gusset 46, the second gusset 42 and the fourth side gusset 47 are integrally formed, wherein the third side gusset 46 is connected to the second gusset 42 and integrally formed, the fourth side gusset 47 is connected to the second gusset 42 and integrally formed, and the third side gusset 46 and the fourth side gusset 47 are in contact with each other but not connected.

[0113] The second direction can refer to the e2 direction in the drawings, and the third direction can refer to the e3 direction in the drawings.

[0114] By connecting two first side films 39 on opposite sides of the first film 32 along the second direction, the two side edges of the first surface 21 along the second direction can be sufficiently covered, avoiding the risk of the two side edges of the first surface 21 being exposed from the gap between the first side film 39 and the first film 32 and contacting the shell 10; by connecting two third side films 46 on opposite sides of the second film 42 along the second direction, the two side edges of the second surface 22 along the second direction can be sufficiently covered, avoiding the risk of the two side edges of the second surface 22 being exposed from the gap between the third side film 46 and the second film 42 and contacting the shell 10.

[0115] By connecting two second side films 40 on opposite sides of the first film 32 along the third direction, the two side edges of the first surface 21 along the third direction can be sufficiently covered, avoiding the risk of the two side edges of the first surface 21 being exposed from the gap between the first side film 39 and the first film 32 and contacting the shell 10; by connecting two fourth side films 47 on opposite sides of the second film 42 along the third direction, the two side edges of the second surface 22 along the third direction can be sufficiently covered, avoiding the risk of the two side edges of the second surface 22 being exposed from the gap between the second side film 40 and the fourth film and contacting the shell 10.

[0116] By overlapping at least part of the first side film 39 and the third side film 46 on the same side, in the first direction, the first side surface 24 can be covered by the first side film 39 or the third side film 46, avoiding the risk of the side surface 23 contacting the shell 10 and the risk of the electrode assembly 20 at the junction of the first side film and the third side film contacting the shell 10. By overlapping at least part of the second side film 40 and the fourth side film 47 on the same side, in the first direction, the second side surface 25 can be covered by the second side film 40 or the fourth side film 47, avoiding the risk of the side surface 23 contacting the shell 10 and the risk of the electrode assembly 20 at the junction of the second side film and the fourth side film contacting the shell 10.

[0117] In the above embodiments, by connecting two first side films 39 on opposite sides of the first film 32 along the second direction, connecting two second side films 40 on opposite sides of the first film 32 along the third direction, and connecting two third side films 46 on opposite sides of the second film 42 along the second direction, and connecting two fourth side films 47 on opposite sides of the second film 42 along the third direction, the four surrounding sides of the first surface 21 and the second surface 22 can be sufficiently covered, reducing the risk of the four surrounding sides of the first surface 21 and the second surface 22 being exposed from the joints of the insulation protective film 30 and contacting the shell 10. By at least partially overlapping the first side film 39 and the third side film 46 on the same side, and at least partially overlapping the second side film 40 and the fourth side film 47 on the same side, the side surface 23 can be covered by the insulation protective film 30 in the first direction, improving the insulation between the electrode assembly 20 and the shell 10.

[0118] In some embodiments, with reference to Figures 2-5 , the first side film 39 is attached to the first side surface 24, and at least part of the third side film 46 on the same side is attached to the outer surface of the first side film 39; the second side film 40 is attached to the second side surface 25, and at least part of the fourth side film 47 on the same side is attached to the outer surface of the second side film 40.

[0119] In the above embodiments, by attaching the first side film 39 to the first side surface 24, and attaching at least part of the third side film 46 on the same side to the outer surface of the first side film 39, the third side film 46 on the same side can wrap the first side film 39, avoiding the first side film 39 and the third side film 46 from separating to expose the first side surface 24 and contacting the shell 10, so that the insulation protective film 30 more fully covers the electrode assembly 20; by attaching the second side film 40 to the second side surface 25, and attaching at least part of the fourth side film 47 on the same side to the outer surface of the second side film 40, the second side film 40 on the same side can wrap the fourth side film 47, avoiding the second side film 40 and the fourth side film 47 from separating to expose the second side surface 25 and contacting the shell 10, so that the insulation protective film 30 more fully covers the electrode assembly 20.

[0120] In some embodiments, with reference to Figures 2-5 , the first side film 39 completely covers the first side surface 24, and the third side film 46 on the same side completely covers the first side film 39.

[0121] In the above embodiment, by making the first side film 39 completely cover the first side surface 24, and the third side film 46 on the same side completely cover the first side film 39, the first side surface 24 can be covered by the first side film 39 in the first direction, and the overlapping area of the first side film 39 and the third side film 46 is larger, and the first side film 39 and the third side film 46 cover the first side surface 24 more fully.

[0122] In some embodiments, referring to Figures 2-5 , the second side film 40 completely covers the second side surface 25, and the fourth side film 47 on the same side completely covers the second side film 40.

[0123] In the above embodiment, by making the second side film 40 completely cover the second side surface 25, and the fourth side film 47 on the same side completely cover the second side film 40, the second side surface 25 can be covered by the second side film 40 in the first direction, and the overlapping area of the second side film 40 and the fourth side film 47 is larger, and the second side film 40 and the fourth side film 47 cover the first side surface 24 more fully.

[0124] In some embodiments, referring to Figures 2-5 , the fourth side film 47 comprises a main body part 48 and an extension part 49, the main body part 48 covers the second side surface 25 and is at least partially attached to the outer surface of the second side film 40, and the extension part 49 covers the first side surface 24.

[0125] For example, the main body part 48 and the extension part 49 are integrally formed.

[0126] In the above embodiment, by making the main body part 48 cover the second side surface 25 and be at least partially attached to the outer surface of the second side film 40, the main body part 48 can cover the second side film 40, reducing the risk of the second side film 40 and the fourth side film 47 being separated to expose the second side surface 25 to contact the shell 10, and the insulating protective film 30 can more fully cover the electrode assembly 20. By making the fourth side film 47 comprise the extension part 49, the extension part 49 covers the first side surface 24, the extension part 49 can cover the gap between the fourth side film 47 and the third side film 46, so that the connection between the first side surface 24 and the second side surface 25 is more fully insulated and protected, and the risk of the electrode assembly 20 at the connection between the first side surface 24 and the second side surface 25 being exposed through the joint between the fourth side film 47 and the third side film 46 and contacting the shell 10 is reduced.

[0127] In some embodiments, referring to Figures 2-5The first side film 39 completely covers the first side surface 24, and the third side film 46 on the same side completely covers the first side film 39. The extension 49 covers the first side surface 24 and is attached to the outer surface of the third side film 46.

[0128] For example, when the electrode assembly 20 is covered by the insulation protective film 30, the first film 32 of the first protective film 31 is aligned with the first surface 21, and the first side film 37 and the second side film 44 are folded downward, so that the first side film 37 covers the first side surface 24 and the second side film 44 covers the second side surface 25. The second film 42 of the second protective film 41 is aligned with the second surface 22, and the third side film and the fourth side film are folded upward, so that the third side film covers the first side film 37 and the main body 48 of the fourth side film covers the second side film 44. Finally, the extension 49 is folded toward the first side surface 24, so that the extension 49 covers part of the third side film.

[0129] In the above embodiment, by making the first side film 39 completely cover the first side surface 24 and the third side film 46 on the same side completely cover the first side film 39, the first side surface 24 can be covered by the first side film 39 in the first direction, and the overlapping area of the first side film 39 and the third side film 46 is larger, so that the first side film 39 and the third side film 46 can more fully cover the first side surface 24. By making the main body 48 cover the second side surface 25 and at least partially attach to the outer surface of the second side film 40, the main body 48 can cover the second side film 40, reducing the risk of the second side film 40 and the fourth side film 47 joint exposing the second side surface 25 contacting the shell 10, so that the insulation protective film 30 can more fully cover the electrode assembly 20. By making the extension 49 cover the first side surface 24 and attach to the outer surface of the third side film 46, the extension 49 can cover the gap between the fourth side film 47 and the third side film 46, so that the connection between the first side surface 24 and the second side surface 25 can be more fully insulated and protected, reducing the risk of the electrode assembly 20 between the first side surface 24 and the second side surface 25 being exposed through the joint between the fourth side film 47 and the third side film 46 and contacting the shell 10.

[0130] In some embodiments, referring to Figure 3 and Figure 4 The electrode assembly 20 includes an electrode body 26 and a tab 27 connected to one side of the electrode body 26 along the first direction, and the first film 32 is provided with a relief hole 34 for avoiding the tab 27.

[0131] In the above embodiment, the first film sheet 32 is provided with the avoiding hole 34 for avoiding the tab 27, so that the tab 27 can be led out of the avoiding hole 34.

[0132] In some embodiments, referring to Figure 2 and Figure 3 , the shell 10 includes the top cover 11, the top cover 11 is located at one side of the electrode assembly 20 along the first direction and the first surface 21 faces the top cover 11, the top cover 11 is provided with the pole 12, the pole 12 is connected with the tab 27, the inner side of the top cover 11 has the plastic layer, and the first film sheet 32 is hot melt bonded with the plastic layer.

[0133] In the above embodiment, the top cover 11 is provided with the pole 12 connected with the tab 27, so that the electric device can be directly connected with the pole 12 to use the electricity in the battery, which is convenient for use. The inner side of the top cover 11 has the plastic layer, which is an insulating structure, so that the first surface 21 and the top cover 11 can be more fully insulated, and the risk of electric contact between the first surface 21 and the top cover 11 can be more fully reduced. The first film sheet 32 is hot melt bonded with the plastic layer, so that the first film sheet 32 and the plastic layer are relatively fixed. Since the insulating protective film 30 covers the electrode assembly 20, the electrode assembly 20 can be fixed relative to the shell 10, and the risk of the electrode assembly 20 moving in the shell 10 to damage the insulating protective film 30 and cause the electrode assembly 20 to contact the shell 10 can be reduced.

[0134] In some embodiments, referring to Figures 2-4 , the shell 10 is provided with the liquid injection hole 13, the first film sheet 32 is provided with the liquid inlet hole 36 opposite to the liquid injection hole 13, the shell 10 is provided with the pressure relief valve 14, the first film sheet 32 is provided with the exhaust hole 35, and at least part of the exhaust hole 35 is arranged opposite to the pressure relief valve 14.

[0135] At least part of the exhaust hole 35 is arranged opposite to the pressure relief valve 14, including two cases: the first film sheet 32 is provided with the exhaust hole 35, and all of the exhaust hole 35 is arranged opposite to the pressure relief valve 14; or the first film sheet 32 is provided with the exhaust hole 35, and part of the exhaust hole 35 is arranged opposite to the pressure relief valve 14, and the other part of the exhaust hole 35 is arranged staggered to the pressure relief valve 14.

[0136] In the above embodiment, by providing the liquid injection hole 13 on the shell 10 and the liquid inlet hole 36 on the first diaphragm 32 opposite to the liquid injection hole 13, the relevant personnel can inject the electrolyte into the liquid injection hole 13, and the electrolyte enters the electrode assembly 20 through the liquid inlet hole 36 to supplement the electrolyte of the electrode assembly 20. By providing the pressure relief valve 14 on the shell 10 and the exhaust hole 35 on the first diaphragm 32, the gas in the electrode assembly 20 can be discharged to the outside of the battery monomer 102 through the exhaust hole 35 and the pressure relief valve 14, thereby reducing the pressure inside the battery monomer 102 and improving the safety of the battery monomer 102. By arranging at least part of the exhaust hole 35 opposite to the pressure relief valve 14, the gas leaving the electrode assembly 20 through this part of the exhaust hole 35 can leave the battery monomer 102 through the pressure relief valve 14 in a shorter path, thereby more quickly releasing the pressure in the battery monomer 102 and more fully and timely improving the safety of the battery monomer 102.

[0137] In some embodiments, referring to Figure 5 , the first direction is the up-down direction, the second diaphragm 42 is located below the first diaphragm 32, and the second diaphragm 42 is provided with a liquid suction hole 43.

[0138] In the above embodiment, by providing the liquid suction hole 43 on the second diaphragm 42 located below, the electrolyte on the bottom surface of the electrode assembly 20 can enter the electrode assembly 20 through the liquid suction hole 43 on the second diaphragm 42, so that the electrode assembly 20 can more fully absorb the electrolyte.

[0139] Referring to Figure 6 , in a second aspect, the utility model provides a kind of battery device 101, comprising: box 1011;According to the battery monomer 102 of the first aspect of the utility model, it is located in box 1011.

[0140] For example, the battery device 101 can be a battery pack.

[0141] In the above technical solution, by making the battery device 101 include the battery monomer 102 according to the first aspect of the utility model, the electrode assembly 20 of the battery monomer 102 has a lower risk of contact with the shell 10, reducing the risk of electrochemical corrosion and short circuit between the electrode assembly 20 and the shell 10, and improving the safety of the battery monomer 102.

[0142] Referring to Figure 7 , in a third aspect, the utility model provides a kind of electric device 100, comprising the battery device 101 of the second aspect of the utility model.

[0143] For example, the electric device 100 can be a vehicle, wherein the vehicle includes a battery pack that stores electrical energy and provides electrical energy to the vehicle.

[0144] In the above technical solution, by making the battery device 101 include the battery monomer 102 according to the first aspect of the utility model, the electrode assembly 20 of the battery monomer 102 has a lower risk of contacting the shell 10, reduces the risk of electrochemical corrosion and short circuit between the electrode assembly 20 and the shell 10, and improves the safety of the battery monomer 102.

[0145] The following describes the battery monomer 102 according to some embodiments of the utility model. Figures 1-7

[0146] Referring to Figures 1-7 In this embodiment, the battery monomer 102 includes a shell 10, an electrode assembly 20, and an insulating protective film 30.

[0147] The electrode assembly 20 is arranged in the shell 10, and an outer surface of the electrode assembly 20 includes a first surface 21, a second surface 22, and a side surface 23. The first surface 21 and the second surface 22 are oppositely arranged along a first direction, and the side surface 23 is connected between the first surface 21 and the second surface 22. The first direction is a vertical direction, and the second surface 22 is located below the first surface 21.

[0148] The insulating protective film 30 is wrapped on the outer surface of the electrode assembly 20 and located in the shell 10. The insulating protective film 30 includes a first protective film 31 and a second protective film 41. The first protective film 31 includes a first film sheet 32 and a first side film sheet 37, and the second protective film 41 includes a second film sheet 42 and a second side film sheet 44. The first film sheet 32 covers the first surface 21, and the second film sheet 42 covers the second surface 22. The second film sheet 42 is located below the first film sheet 32.

[0149] The first side film sheet 37 is connected to a side of the first film sheet 32 along the first direction and close to the second surface 22, and the second side film sheet 44 is connected to a side of the second film sheet 42 along the first direction and close to the first surface 21. The first side film sheet 37 and the second side film sheet 44 both cover the side surface 23 and are arranged around the side surface 23. An edge of the first side film sheet 37 close to the second surface 22 is a first side film edge 38, and an edge of the second side film sheet 44 close to the first surface 21 is a second side film edge 45. The first side film edge 38 is flush with an outer edge of the second surface 22, and the second side film edge 45 is flush with an outer edge of the first surface 21. Overlapping portions of the first side film sheet 37 and the second side film sheet 44 are bonded by hot melting or by insulating glue.

[0150] ​The side surface 23 comprises two first side surfaces 24 oppositely arranged along a second direction and two second side surfaces 25 oppositely arranged along a third direction; the first side gasket 37 comprises two first side gasket pieces 39 and two second side gasket pieces 40, the two first side gasket pieces 39 being connected to opposite sides of the first gasket 32 along the second direction, and the two second side gasket pieces 40 being connected to opposite sides of the first gasket 32 along the third direction, the third direction, the second direction and the first direction being intersected with each other, the second side gasket 44 comprises two third side gasket pieces 46 and two fourth side gasket pieces 47, the two third side gasket pieces 46 being connected to opposite sides of the second gasket 42 along the second direction, and the two fourth side gasket pieces 47 being connected to opposite sides of the second gasket 42 along the third direction.

[0151] One of the first side gasket pieces 39 and one of the third side gasket pieces 46 cover one of the first side surfaces 24, the other of the first side gasket pieces 39 and the other of the third side gasket pieces 46 cover the other of the first side surfaces 24, the first side gasket pieces 39 completely cover the first side surfaces 24, and the third side gasket pieces 46 on the same side completely cover the first side gasket pieces 39.

[0152] One of the second side gasket pieces 40 and one of the fourth side gasket pieces 47 cover one of the second side surfaces 25, the other of the second side gasket pieces 40 and the other of the fourth side gasket pieces 47 cover the other of the second side surfaces 25, the second side gasket pieces 40 completely cover the second side surfaces 25, and the fourth side gasket pieces 47 on the same side completely cover the second side gasket pieces 40.

[0153] The fourth side gasket pieces 47 comprise a main body 48 and an extension 49, the main body 48 covers the second side surfaces 25 and is attached to the outer surface of the second side gasket pieces 40, and the extension 49 covers the first side surfaces 24.

[0154] The electrode assembly 20 comprises an electrode body 26 and a tab 27, the tab 27 being connected to one side of the electrode body 26 along the first direction, and the first gasket 32 is provided with a relief hole 34 for avoiding the tab 27.

[0155] The shell 10 comprises a top cover 11, the top cover 11 being located at one side of the electrode assembly 20 along the first direction and the first surface 21 facing the top cover 11, the top cover 11 is provided with a pole 12, the pole 12 being connected with the tab 27, the inner side of the top cover 11 has a plastic layer, and the first gasket 32 is hot-melt adhered with the plastic layer. The shell 10 is provided with a liquid injection hole 13, the first gasket 32 is provided with a liquid inlet hole 36 opposite to the liquid injection hole 13, the shell 10 is provided with a pressure relief valve 14, the first gasket 32 is provided with an exhaust hole 35, at least part of the exhaust hole 35 is arranged opposite to the pressure relief valve 14, and the second gasket 42 is provided with a liquid suction hole 43.

[0156] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0157] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: case; An electrode assembly is disposed within the housing. The outer surface of the electrode assembly includes a first surface, a second surface, and a side surface. The first surface and the second surface are disposed opposite to each other along a first direction, and the side surface is connected between the first surface and the second surface. An insulating protective film is provided, which covers the outer surface of the electrode assembly and is located within the housing. The insulating protective film includes a first protective film and a second protective film. The first protective film includes a first sheet and a first sidewall sheet. The second protective film includes a second sheet and a second sidewall sheet. The first sheet covers the first surface, and the second sheet covers the second surface. The first sidewall sheet is connected to the side of the first sheet along the first direction and close to the second surface. The second sidewall sheet is connected to the side of the second sheet along the first direction and close to the first surface. Both the first sidewall sheet and the second sidewall sheet cover the sidewall surface. The first sidewall sheet and the second sidewall sheet are at least partially overlapped.

2. The battery cell according to claim 1, characterized in that, Both the first side diaphragm and the second side diaphragm are disposed around the side diaphragm surface.

3. The battery cell according to claim 2, characterized in that, The edge of the first side membrane near the second surface is the first side membrane edge, and the edge of the second side membrane near the first surface is the second side membrane edge. The first side membrane edge is located on the side of the second side membrane edge near the second surface, and the second side membrane edge is located on the side of the first side membrane edge near the first surface.

4. The battery cell according to claim 3, characterized in that, The edge of the first side membrane is flush with the outer edge of the second surface; and / or, the edge of the second side membrane is flush with the outer edge of the first surface.

5. The battery cell according to claim 2, characterized in that, The first side circumference membrane is attached to the side circumference surface, and at least a portion of the second side circumference membrane is attached to the outer surface of the first side circumference membrane. The unfolded area of ​​the second side circumference membrane is greater than the unfolded area of ​​the first side circumference membrane.

6. The battery cell according to claim 5, characterized in that, The overlapping portions of the first side diaphragm and the second side diaphragm are bonded by hot melt adhesive or by insulating adhesive.

7. The battery cell according to any one of claims 1-6, characterized in that, The side surface includes two first side surfaces arranged opposite each other along a second direction and a second side surface arranged opposite each other along a third direction. The first side diaphragm includes two first side diaphragms and two second side diaphragms. The two first side diaphragms are connected to opposite sides of the first diaphragm along a second direction, and the two second side diaphragms are connected to opposite sides of the first diaphragm along a third direction. The third direction, the second direction, and the first direction intersect each other. The second side diaphragm includes two third side diaphragms and two fourth side diaphragms. The two third side diaphragms are connected to opposite sides of the second diaphragm along the second direction, and the two fourth side diaphragms are connected to opposite sides of the second diaphragm along the third direction. One of the first side membranes and one of the third side membranes are both covered on one of the first side surfaces, and another first side membrane and another third side membrane are both covered on the other first side surface, with at least a partial overlap between the first side membranes and the third side membranes located on the same side; One of the second-side membranes and one of the fourth-side membranes are both covered on one of the second-side surfaces, and another second-side membrane and another fourth-side membrane are both covered on the other second-side surface, with at least a partial overlap between the second-side membranes and the fourth-side membranes located on the same side.

8. The battery cell according to claim 7, characterized in that, The first side diaphragm is attached to the first side surface, and at least a portion of the third side diaphragm located on the same side is attached to the outer surface of the first side diaphragm; The second side diaphragm is attached to the second side surface, and at least a portion of the fourth side diaphragm located on the same side is attached to the outer surface of the second side diaphragm.

9. The battery cell according to claim 8, characterized in that, The first side diaphragm completely covers the first side surface, and the third side diaphragm located on the same side completely covers the first side diaphragm; And / or, the second side diaphragm completely covers the second side surface, and the fourth side diaphragm located on the same side completely covers the second side diaphragm.

10. The battery cell according to claim 8, characterized in that, The fourth side diaphragm includes a connected main body and an extension, the main body covering the second side surface and at least partially adhering to the outer surface of the second side diaphragm, and the extension covering the first side surface.

11. The battery cell according to claim 10, characterized in that, The first side diaphragm completely covers the first side surface, and the third side diaphragm located on the same side completely covers the first side diaphragm; The extension covers the first side surface and adheres to the outer surface of the third side diaphragm.

12. The battery cell according to any one of claims 1-6, characterized in that, The electrode assembly includes an electrode body and a tab. The tab is connected to one side of the electrode body along the first direction, and the first diaphragm has a clearance hole for avoiding the tab.

13. The battery cell according to claim 12, characterized in that, The housing includes a top cover, which is located on one side of the electrode assembly along the first direction and the first surface faces the top cover. The top cover is provided with an electrode post, which is connected to the electrode tab. The inner side of the top cover has a plastic layer, and the first diaphragm is thermally bonded to the plastic layer.

14. The battery cell according to claim 12, characterized in that, The housing is provided with a liquid injection hole, the first diaphragm is provided with a liquid inlet hole opposite to the liquid injection hole, the housing is provided with a pressure relief valve, the first diaphragm is provided with a vent hole, and at least a portion of the vent hole is arranged opposite to the pressure relief valve.

15. The battery cell according to any one of claims 1-6, characterized in that, The first direction is the up-down direction, the second membrane is located below the first membrane, and the second membrane is provided with a liquid suction hole.

16. A battery device, characterized in that, include: Box; The battery cell according to any one of claims 1-15 is disposed in the housing.

17. An electrical device, characterized in that, Includes the battery device as described in claim 16.

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