Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment, and solves the problem of insulation failure of a product caused by bending of an end plate in the prior art. The battery device comprises a battery assembly, an end plate and an insulating protective film, the battery assembly comprises a plurality of single batteries which are arranged in a stacked manner; the end plate is arranged at the end part of the battery assembly along the stacking direction; the battery cell closest to the end plate in the battery assembly is defined as an end cell; the side face of each end single body comprises a first side face and a second side face which are mutually connected, and the connecting positions of the first side faces and the second side faces intersect to form corners. The first side surface faces the end plate; the insulating protective film coats the side surface of the end part single body; the battery device further comprises an insulation enhancement layer arranged between the insulation protection film and the side face of the end single body. The insulating enhancement layer at least wraps the corner.

Description

Technical Field

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

[0002] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. However, the current national standard / group standard does not have power battery scrapping standards and related implementation specifications, which makes it inevitable that the service life / mileage of the product will far exceed the design life of the product.

[0003] For products that use an end plate design, that is, a battery device that is assembled from an end plate and multiple battery cells into a battery module and then installed in a battery case, the end plate will bend over the years / mileage of use, causing insulation failure in the product. Utility Model Content

[0004] The main technical problem solved by the present application is to provide a battery device and an electrical device to solve the problem in the prior art that the end plate is bent and causes insulation failure of the product.

[0005] To solve the above technical problems, the first technical solution adopted in the present application is: to provide a battery device, the battery device includes a battery assembly, an end plate and an insulating protective film; the battery assembly includes a plurality of stacked battery cells; the end plate is arranged at the end of the battery assembly along the stacking direction; the battery cell closest to the end plate in the battery assembly is defined as the end cell; the side of the end cell includes a first side surface and a second side surface connected to each other, and the connection between the first side surface and the second side surface is cross-arranged to form a corner; the first side surface is arranged toward the end plate; the insulating protective film is coated on the side of the end cell; wherein the battery device also includes an insulating reinforcement layer arranged between the insulating protective film and the side of the end cell; the insulating reinforcement layer at least coats the corner.

[0006] In this embodiment, an insulation reinforcement layer is provided at the corner of the battery cell closest to the end plate facing the end plate. The corner is a position where the insulation between the end plate and the end cell is prone to failure after the end plate is bent. The insulation reinforcement layer at least covers the corner. On the basis of the insulation protection of the insulation protection film, an additional layer of insulation protection is provided between the end plate and the end cell, thereby enhancing the insulation effect between the end plate and the end cell.

[0007] In some embodiments, the side surface of the end monomer includes two second side surfaces arranged opposite to each other, and the connection points between the first side surface and the two second side surfaces are respectively cross-arranged to form two corners; the number of insulating reinforcement layers is two, one insulating reinforcement layer is arranged at one corner, and the other insulating reinforcement layer is arranged at the other corner.

[0008] In this embodiment, two corners are formed on the side of the end monomer facing the end plate. The two corners are positions where the insulation between the end plate and the end monomer is prone to failure after the end plate is bent. Providing the insulation reinforcement layer at the two corners can reduce the interference of the insulation reinforcement layer on the main side of the end monomer, and enhance the insulation effect between the end plate and the end monomer with a smaller insulation reinforcement layer as possible, which helps to save material costs.

[0009] In some embodiments, the insulating protective film includes two first insulating protective films and one second insulating protective film; the two first insulating protective films are stacked one by one with two insulating reinforcement layers; a second insulating protective film is connected between the two first insulating protective films; the second insulating protective film is adhered to the first side surface of the end monomer that is not covered by the insulating reinforcement layer; wherein the thickness of the second insulating protective film is equal to the sum of the thickness of the first insulating protective film and the insulating reinforcement layer.

[0010] In this embodiment, the thickness of the second insulating protective film is designed to be equal to the sum of the thicknesses of the first insulating protective film and the insulating reinforcement layer, so that the surface of the insulating protective film between the end plate and the end monomer facing the end plate is flattened, which can reduce the risk of local stress concentration and thus reduce the possibility of lithium deposition; at the same time, it is also convenient for the insulating protective film to be bonded to the entire surface of the end plate.

[0011] In some embodiments, the second insulating protective film includes a first insulating protective sub-film layer and a second insulating protective sub-film layer; the first insulating protective sub-film layer is adhered to the first side; the thickness of the first insulating protective sub-film layer is equal to the thickness of the insulating reinforcement layer; the second insulating protective sub-film layer is stacked on the side of the first insulating protective sub-film layer away from the first side; the second insulating protective sub-film layer is interconnected with the first insulating protective film and have the same thickness.

[0012] In this embodiment, the thickness of the first insulating protection sub-film layer is designed to be equal to the thickness of the insulating reinforcement layer, so that the surfaces of the first insulating protection sub-film layer and the insulating reinforcement layer facing the end plate can be located in the same plane. The second insulating protection sub-film layer is interconnected with the first insulating protection film and has the same thickness, so that the second insulating protection sub-film layer and the first insulating protection film can be on the same plane and adopt the same process, which can simplify the process and help improve the flatness of the surface of the insulating protection film facing the end plate, and reduce the risk of local stress concentration, thereby reducing the possibility of lithium precipitation.

[0013] In some embodiments, the battery device also includes an insulating cover, which includes a main body and an extension portion; the main body is arranged between the end plate and the end monomer; the extension portion is cross-connected to one side of the main body; wherein the projection of the extension portion on the second side covers the projection of the insulating reinforcement layer on the second side.

[0014] In this embodiment, the main body of the insulating cover is arranged between the end plate and the end monomer, which can further enhance the insulation effect between the end monomer and the end plate; and, the extension portion is cross-connected with one side of the main body, and the projection of the extension portion on the second side covers the projection of the insulation reinforcement layer on the second side, so that the insulating cover can cover the insulation reinforcement layer, further enhancing the insulation effect between the corner of the end monomer and the end plate, thereby reducing the risk of insulation failure.

[0015] In some embodiments, the insulating protective film also includes a third insulating protective film; the third insulating protective film is connected to a first insulating protective film and is adhered to the second side of the end monomer that is not covered by the insulating reinforcement layer; wherein the third insulating protective film has a window, and the insulating reinforcement layer and the extension portion are both spaced apart from the window.

[0016] In this embodiment, the third insulating protective film is provided to enhance the insulation effect between the end monomer and other components; and a window is provided on the third insulating protective film to expose part of the second side surface of the end monomer, so as to enhance the firmness of the second side surface being glued to other components. In addition, the insulating reinforcement layer and the extension portion are both spaced apart from the window to facilitate side gluing.

[0017] In some embodiments, the side surface of the end monomer includes two second side surfaces that are opposite to each other, and the connections between the first side surface and the two second side surfaces are respectively cross-arranged to form two corners; the insulation reinforcement layer only covers the two corners and the first side surface.

[0018] In this embodiment, the insulation enhancement layer covers the two corners and the first side surface, and on the basis of the insulation protection of the insulation protection film, a new insulation protection is added between the end plate and the end monomer, thereby enhancing the insulation effect between the end plate and the end monomer. In addition, the insulation enhancement layer covers the first side surface, which is conducive to improving the thickness uniformity of the insulation protection film on the first side surface, and can reduce the risk of local stress concentration, thereby reducing the possibility of lithium precipitation.

[0019] In some embodiments, the battery device further includes an insulating covering layer, which covers a surface of the end plate facing the end cell.

[0020] In this embodiment, an insulating covering layer is provided on the surface of the end plate facing the end monomer, and on the basis of the insulating protection of the insulating protective film and the insulating reinforcement layer, an additional layer of insulating protection is provided between the end plate and the end monomer, thereby further enhancing the insulating effect between the end plate and the end monomer.

[0021] In some embodiments, the insulation reinforcement layer is an insulation coating having better damage resistance than the insulation protection film; and / or the insulation cover layer is an insulation coating having better damage resistance than the insulation protection film.

[0022] In this embodiment, the insulation reinforcement layer and / or the insulation covering layer is an insulation coating having better damage resistance than the insulation protective film, so as to increase the service life of the insulation reinforcement layer and / or the insulation covering layer, so that even if the end plate bends with age / mileage and squeezes the insulation cover, regardless of whether the insulation protective film is worn, the risk of insulation failure between the end plate and the battery cell can be reduced due to the presence of the insulation reinforcement layer and / or the insulation covering layer.

[0023] In order to solve the above technical problems, the second technical solution adopted in the present application is: to provide an electrical equipment, including the above battery device.

[0024] In this embodiment, the electric device includes the above-mentioned battery device, so the electric device has the same technical effect as the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technical workers in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 It is a structural schematic diagram of an embodiment of an electric device provided by the present application;

[0027] Figure 2 is a schematic diagram of the three-dimensional structure of an embodiment of a battery device provided by the present application;

[0028] Figure 3 is a structural schematic diagram of an embodiment of a battery cell provided by the present application;

[0029] Figure 4 is a schematic diagram of a top view of a battery device according to an embodiment of the present application;

[0030] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 It is a front view structural schematic diagram of an embodiment of a battery cell and an insulation reinforcement layer provided by the present application;

[0032] Figure 7 It is a side view structural schematic diagram of an embodiment of a battery cell and an insulation reinforcement layer provided by the present application;

[0033] Figure 8 It is a front view structural schematic diagram of an embodiment of a battery cell and an insulating cover provided by the present application;

[0034] Fig. 9It is a side view structural schematic diagram of an embodiment of a battery cell and an insulating cover provided by the present application;

[0035] Fig.10 is a structural schematic diagram of another embodiment of the battery device provided by the present application;

[0036] Fig.11 It is a front view structural schematic diagram of an embodiment of an end plate and an insulating covering layer provided by the present application;

[0037] Fig.12 It is a side view structural schematic diagram of an embodiment of the end plate and the insulating covering layer provided in the present application.

[0038] Description of Figure Numbers:

[0039] 1. Battery device; 10. Battery assembly; 11. Battery cell; 11A. First side; 11B. Second side; 11C. Corner; 111. Connecting member; 112. Cover plate; 113. Post; 114. Safety valve; 115. Electrode assembly; 116. Shell; 12. Box; 121. First part; 122. Second part; 110. End cell; 20. End plate; 30. Insulating protective film; 31. First insulating protective film; 32. Second insulating protective film; 33. Third insulating protective film; 321. First insulating protective sub-film layer; 322. Second insulating protective sub-film layer; 330. Window; 40. Insulating reinforcement layer; 50. Insulating cover; 51. Main body; 52. Extension; 60. Insulating covering layer; 2. Electrical devices. DETAILED DESCRIPTION

[0040] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0041] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical workers in the field without making creative work are within the scope of protection of this application.

[0043] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0044] 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.

[0045] The battery device can be a power battery, which is a power source for tools. Power batteries mostly refer to batteries that provide power for electric vehicles, electric trains, electric bicycles, golf carts and other transportation tools, as well as aerospace. Of course, the battery device can also be an energy storage battery, which refers to a battery used to store energy from renewable energy sources such as hydropower, thermal power, wind power and solar power stations. With the continuous expansion of the application fields of battery devices, the market demand is also constantly expanding.

[0046] The battery device includes a battery box and a battery cell, and the battery cell is contained in the battery box. For products using an end plate design, that is, a battery device in which an end plate and multiple battery cells are assembled into a battery module and then installed in a battery box, the end plate will bend over the years / mileage of use, causing insulation failure of the product.

[0047] In existing battery devices, a heat insulating pad or an insulating cover is often placed between the battery cell and the end plate to reduce the risk of short circuit caused by direct contact between the end plate and the battery cell (ie, the battery cell).

[0048] However, after long-term use by consumers, the end plate will bend due to the expansion of the battery cell, thereby squeezing the thermal insulation pad / insulation cover, causing it to shift, and wearing the battery cell blue film (i.e., the insulating protective film), ultimately causing the product to fail in insulation and reduce product reliability.

[0049] In order to solve the problem of insulation failure of products caused by bending of end plates, the present application provides a battery device, which includes a battery assembly, an end plate and an insulating protective film; the battery assembly includes a plurality of battery cells arranged in a stacked manner; the end plate is arranged at the end of the battery assembly along the stacking direction; the battery cell closest to the end plate in the battery assembly is defined as the end cell; the side of the end cell includes a first side and a second side connected to each other, and the connection between the first side and the second side is cross-arranged to form a corner; the first side is arranged toward the end plate; the insulating protective film is coated on the side of the end cell; wherein the battery device also includes an insulating reinforcement layer arranged between the insulating protective film and the side of the end cell; the insulating reinforcement layer at least covers the corner. In this embodiment, an insulating reinforcement layer is arranged at the corner of the side of the battery cell closest to the end plate facing the end plate, and the corner is a position where the insulation failure with the end cell is easy after the end plate is bent, and the insulating reinforcement layer at least covers the corner, and on the basis of the insulating protection of the insulating protective film, a new layer of insulating protection is added between the end plate and the end cell, thereby enhancing the insulation effect between the end plate and the end cell.

[0050] See also Figure 1 An embodiment of the present application provides an electrical device, which includes a battery device 1.

[0051] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. For the convenience of explanation, the following embodiments are described by taking the electric equipment as a vehicle as an example.

[0052] In some embodiments, the electric device further includes an electric component 2. The battery device 1 is electrically connected to the electric component 2. The battery device 1 is used to provide electric energy to the electric device so that the electric component 2 can work.

[0053] The electrical device 2 may be an element or device that can consume electricity; the electrical device 2 may be a controller and an electronic component, etc. The controller may be a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0054] In some examples, the electric device may be a vehicle, and the electric device 2 may be a lamp (such as a headlight, a taillight, etc.), a display screen, a dashboard, a control system (such as a controller), etc. The vehicle may also include a frame, and the battery device 1 and the electric device 2 are both mounted on the vehicle body.

[0055] See also Figures 2 to 5 The embodiment of the present application also provides a battery device 1, which includes a battery assembly 10, an end plate 20 and an insulating protective film 30; the battery assembly 10 includes a plurality of battery cells 11 stacked together; the end plate 20 is arranged at the end of the battery assembly 10 along the stacking direction; the battery cell 11 closest to the end plate 20 in the battery assembly 10 is defined as an end cell 110; the side of the end cell 110 includes a first side 11A and a second side 11B connected to each other, and the connection between the first side 11A and the second side 11B is cross-arranged to form a corner 11C; the first side 11A is arranged toward the end plate 20; the insulating protective film 30 is coated on the side of the end cell 110; wherein the battery device 1 also includes an insulating reinforcement layer 40 arranged between the insulating protective film 30 and the side of the end cell 110; the insulating reinforcement layer 40 at least covers the corner 11C.

[0056] See also Figure 2 The battery device 1 may include a housing 12, wherein the housing 12 has a chamber, wherein one or more battery assemblies 10 are accommodated, and an end plate 20 is disposed in the chamber ( Figure 2 (not shown). The battery case 12 can protect the battery assembly 10 and facilitate the collection of multiple battery assemblies 10. The shape of the battery case 12 can be specifically set as needed, for example, the shape of the battery case 12 can be cylindrical, rectangular, etc.

[0057] Among them, the box body 12 can adopt a variety of structures. In some embodiments, the box body 12 can include a first part 121 and a second part 122, the first part 121 and the second part 122 cover each other, and the first part 121 and the second part 122 jointly define a storage space for accommodating the battery assembly 10. The second part 122 can be a hollow structure with one end open, and the first part 121 can be a plate-like structure, and the first part 121 covers the open side of the second part 122, so that the first part 121 and the second part 122 jointly define a storage space; the first part 121 and the second part 122 can also be hollow structures with one side open, and the open side of the first part 121 covers the open side of the second part 122.

[0058] The battery assembly 10 and the end plate 20 can form a battery module. The battery module is a modular unit composed of a plurality of stacked battery cells 11 connected in series, in parallel, or in series and in parallel. The battery module not only includes the battery cells 11 and the end plate 20, but may also include other auxiliary components such as a battery management system (BMS), a heat dissipation system, a protection circuit, a connector, etc. The battery module is designed to improve the overall electrical performance and reliability while facilitating integration into a larger battery system.

[0059] The battery cell 11 may be a secondary battery, which refers to a battery cell 11 that can be continuously used by activating active materials by charging after the battery cell 11 is discharged. The battery cell 11 may include, but is not limited to, 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, and the like.

[0060] See also Figure 3 , the battery cell 11 may include a shell 116, an electrode assembly 115 and a cover plate 112. The shell 116 has a connected cavity and a mounting port. The shell 116 is a hollow structure, and the material of the shell 116 may be metal or plastic; for example, the material of the shell 116 may be copper, iron, aluminum, steel, aluminum alloy, etc. The outer wall surface of the shell 116 is a ring-shaped structure. The outer wall surface of the shell 116 is surrounded to form a connected cavity. The cross-section of the shell 116 may be a rectangular, triangular, diamond, or other shape. The cover plate 112 is connected to the shell 116 and covers the mounting port. The shell 116 is filled with an electrolyte, such as an electrolyte.

[0061] The number of electrode assemblies 115 may be one or more; the electrode assembly 115 is installed in the cavity of the housing 116. The electrode assembly 115 may include an anode electrode sheet and a cathode electrode sheet, and a separator disposed between the anode electrode sheet and the cathode electrode sheet. During the charge and discharge process of the battery cell 11, active ions (such as lithium ions) are embedded and removed back and forth between the anode electrode sheet and the cathode electrode sheet. The separator can prevent the anode electrode sheet and the cathode electrode sheet from short-circuiting to a certain extent, and at the same time allow active ions to pass through.

[0062] The battery cell 11 may also include a safety valve 114 (also referred to as a pressure relief valve), two poles 113 and two connecting members 111 (also referred to as current collecting members). The safety valve 114 may be provided on the cover plate 112, for example, the safety valve 114 is fixed on the cover plate 112, and the safety valve 114 is used to actuate when the internal pressure or temperature of the battery cell 11 reaches a threshold value to discharge the internal electrolyte to reduce the internal pressure or temperature of the battery cell 11. For example, the safety valve 114 may be a temperature-sensitive valve, a pressure-sensitive valve, etc. Two poles 113 may be provided on the cover plate 112, and the two poles 113 are respectively a positive pole and a negative pole, and one pole 113 is connected to one connecting member 111 accordingly. The connecting member 111 is located between the cover plate 112 and the electrode assembly 115, and is used to electrically connect the electrode assembly 115 and the pole 113.

[0063] The side surface of the battery cell 11 refers to the entire annular outer wall surface of the housing 116. That is, the side surface of the end cell 110 refers to the entire annular outer wall surface of the housing 116 thereof.

[0064] In some examples, each side of the battery cell 11 is a plane, the end plate 20 is arranged parallel to the first side 11A, and the first side 11A is arranged perpendicular to the second side 11B. The battery cell 11 of the present application is a square battery cell, and the side of the battery cell 11 includes four sequentially connected side surfaces.

[0065] The end plate 20 is located at the end of the battery assembly 10, and is used to fix and protect the internal battery assembly 10, and ensure the stability and reliability of the entire battery device 1. The end plate 20 can be an output pole plate or a non-output pole plate, wherein the end plate 20 provided with the battery output pole is also called the output pole plate, and the end plate 20 not provided with the battery output pole is also called the non-output pole plate.

[0066] For some examples, see Figure 4 There are two end plates 20, which are located at opposite ends of the battery assembly 10 along the stacking direction and are used to clamp the battery assembly 10. One end plate 20 corresponds to one end monomer 110, that is, there are two end monomers 110.

[0067] The two end plates 20 can further limit the relative movement between the multiple battery cells 11 in the battery assembly 10, thereby improving the structural stability.

[0068] Corner 11C is an angle formed by the intersection of first side surface 11A and second side surface 11B. Corner 11C is a rounded angle or a non-rounded angle. For example, the non-rounded angle may be a right angle, an acute angle, or an obtuse angle. In some embodiments, corner 11C is a rounded angle to reduce stress concentration at corner 11C, thereby reducing the possibility of lithium deposition in battery cell 11.

[0069] The insulating reinforcement layer 40 is disposed at the corner 11C, that is, the insulating reinforcement layer 40 extends from the edge of the first side surface 11A close to the second side surface 11B to the edge of the second side surface 11B close to the first side surface 11A to cover the corner 11C. Figure 6 and Figure 7 The insulating reinforcement layer 40 is L-shaped and extends along the boundary line between the first side surface 11A and the second side surface 11B and extends to opposite ends of the boundary line.

[0070] In other embodiments, in addition to covering the corner 11C, the insulating reinforcement layer 40 may also cover the entire one or more sides of the end monomer 110. In some embodiments, there are two corners 11C, and the insulating reinforcement layer 40 may be one, and the insulating reinforcement layer 40 is provided at only one of the two corners 11C; in other embodiments, there are two corners 11C, and the insulating reinforcement layer 40 is provided at each corner 11C. It can be understood that if the insulating reinforcement layer 40 is provided at only one corner 11C, even if the end plate 20 and the shell 116 of the end monomer 110 are short-circuited at the other corner 11C, the end plate 20 and the shell 116 of the end monomer 110 at the corner 11C where the insulating reinforcement layer 40 is provided will not be short-circuited, and the risk of failure of the two ends of the end monomer 110 being short-circuited can also be reduced.

[0071] The insulating protective film 30 covers not only the side surface of the end cell 110 but also the side surfaces of the remaining battery cells 11 in the battery assembly 10 except the end cell 110. That is, the side surface of each battery cell 11 is provided with the insulating protective film 30.

[0072] The insulating protective film 30 is used to isolate the internal components of the battery cell 11 from the external environment, and prevent harmful substances such as moisture and oxygen from entering the battery cell 11, thereby reducing the possibility of battery performance degradation or danger. Specifically, the insulating protective film 30 can be a blue film.

[0073] In this embodiment, an insulating reinforcement layer 40 is provided at a corner 11C on the side of the battery cell 11 closest to the end plate 20 facing the end plate 20, and the insulating reinforcement layer 40 is provided between the insulating protection film 30 and the side of the end cell 110, so that the insulating reinforcement layer 40 can be in direct contact with the battery cell 11, thereby improving the adhesion of the insulating reinforcement layer 40 on the end cell 110; at the same time, the corner 11C is a position where the insulation between the end plate 20 and the end cell 110 is prone to fail after the end plate 20 is bent, and the insulating reinforcement layer 40 at least covers the corner 11C. On the basis of the insulating protection of the insulating protection film 30, an additional layer of insulating protection is provided between the end plate 20 and the end cell 110, thereby enhancing the insulation effect between the end plate 20 and the end cell 110.

[0074] In some embodiments, see Figure 5 The side surface of the end monomer 110 includes two second side surfaces 11B arranged opposite to each other, and the connection points of the first side surface 11A and the two second side surfaces 11B are respectively cross-arranged to form two corners 11C; the number of the insulating reinforcement layers 40 is two, one insulating reinforcement layer 40 is arranged at one corner 11C, and the other insulating reinforcement layer 40 is arranged at the other corner 11C.

[0075] In this embodiment, two corners 11C are formed on the side of the end monomer 110 facing the end plate 20. The two corners 11C are positions where the insulation between the end plate 20 and the end monomer 110 is easily failed after the end plate 20 is bent. The insulating reinforcement layer 40 is arranged at the two corners 11C. The interference of the insulating reinforcement layer 40 on the main side of the end monomer 110 can be reduced, and the insulation effect between the end plate 20 and the end monomer 110 can be enhanced by using the insulating reinforcement layer 40 of a smaller size as much as possible, which helps to save material costs.

[0076] In some embodiments, see Figure 5 The insulating protection film 30 includes two first insulating protection films 31 and one second insulating protection film 32; the two first insulating protection films 31 are stacked one by one with two insulating reinforcement layers 40; a second insulating protection film 32 is connected between the two first insulating protection films 31; the second insulating protection film 32 is attached to the first side surface 11A of the end monomer 110 that is not covered by the insulating reinforcement layer 40; wherein the thickness of the second insulating protection film 32 is equal to the sum of the thickness of the first insulating protection film 31 and the insulating reinforcement layer 40.

[0077] The first insulating protection film 31 covers the outer surface of the corresponding insulating reinforcement layer 40. The material of the first insulating protection film 31 can be the same as that of the second insulating protection film 32; or, the material of the first insulating protection film 31 can be different from that of the second insulating protection film 32.

[0078] In some examples, the material of the first insulating protection film 31 may be the same as the material of the second insulating protection film 32. The insulating protection film 30 may be an aluminum-plastic composite film.

[0079] In this embodiment, the thickness of the second insulating protective film 32 is designed to be equal to the sum of the thicknesses of the first insulating protective film 31 and the insulating reinforcement layer 40, so that the surface of the insulating protective film 30 located between the end plate 20 and the end monomer 110 facing the end plate 20 is flattened, which can reduce the risk of local stress concentration and thus reduce the possibility of lithium deposition; at the same time, it is also convenient for the insulating protective film 30 to be fully bonded to the end plate 20.

[0080] In some embodiments, see Figure 5 The second insulating protection film 32 includes a first insulating protection sub-film layer 321 and a second insulating protection sub-film layer 322; the first insulating protection sub-film layer 321 is adhered to the first side surface 11A; the thickness of the first insulating protection sub-film layer 321 is equal to the thickness of the insulating reinforcement layer 40; the second insulating protection sub-film layer 322 is stacked on the side of the first insulating protection sub-film layer 321 away from the first side surface 11A; the second insulating protection sub-film layer 322 is interconnected with the first insulating protection film 31 and has the same thickness.

[0081] The first insulating protection sub-film layer 321 is disposed between the two insulating reinforcement layers 40 .

[0082] The material of the first insulating protection sub-film layer 321 and the material of the second insulating protection sub-film layer 322 may be the same or different.

[0083] In some examples, the first insulating protective sub-film layer 321 and the second insulating protective sub-film layer 322 are made using different processes, that is, they are prepared separately and then stacked together. The material of the second insulating protective sub-film layer 322 is the same as that of the first insulating protective film 31, and can be made using the same process, that is, integrally formed, to simplify the process, and at the same time facilitate the flattening of the surface of the insulating protective film 30 facing the end plate 20. Specifically, the first insulating protective sub-film layer 321 is first attached to the first side surface 11A, and then the second insulating protective sub-film layer 322 and the first insulating protective film 31 are prepared.

[0084] In this embodiment, the thickness of the first insulating protection sub-film layer 321 is designed to be equal to the thickness of the insulating reinforcement layer 40, so that the first insulating protection sub-film layer 321 and the surface of the insulating reinforcement layer 40 facing the end plate 20 can be located in the same plane. The second insulating protection sub-film layer 322 is connected to the first insulating protection film 31 and is integrally formed with the same thickness, which can simplify the process and help improve the flatness of the surface of the insulating protection film 30 facing the end plate 20, which can reduce the risk of local stress concentration, thereby reducing the possibility of lithium precipitation.

[0085] In some embodiments, see Figure 5 , Figure 8 and Fig. 9 The battery device 1 also includes an insulating cover 50, which includes a main body 51 and an extension portion 52; the main body 51 is arranged between the end plate 20 and the end monomer 110; the extension portion 52 is cross-connected with one side of the main body 51; wherein the projection of the extension portion 52 on the second side surface 11B covers the projection of the insulating reinforcement layer 40 on the second side surface 11B.

[0086] The insulating cover 50 is disposed between the end plate 20 and the battery assembly 10 to insulate the end plate 20 from the battery assembly 10 .

[0087] The main body 51 may be a plate-shaped structure so as to be in full contact with the end plate 20 and the insulating protection film 30 .

[0088] In some examples, the main body 51 and the extension portion 52 are fixedly connected, for example, the main body 51 and the extension portion 52 are vertically arranged, and the positions of the main body 51 and the extension portion 52 are relatively fixed; in other examples, the extension portion 52 is movably connected relative to the main body 51, for example, the extension portion 52 can be folded relative to the main body 51.

[0089] In this embodiment, the main body 51 of the insulating cover 50 is arranged between the end plate 20 and the end monomer 110, which can further enhance the insulation effect between the end monomer 110 and the end plate 20; and, the extension portion 52 is cross-connected with one side of the main body 51, and the projection of the extension portion 52 on the second side surface 11B covers the projection of the insulating reinforcement layer 40 on the second side surface 11B, so that the insulating cover 50 can cover the insulating reinforcement layer 40, further enhancing the insulation effect between the corner 11C of the end monomer 110 and the end plate 20, thereby reducing the risk of insulation failure.

[0090] In some embodiments, the insulating protection film 30 further includes a third insulating protection film 33, which is connected to one of the first insulating protection films 31 and is attached to a portion of the second side surface 11B of the end monomer 110 that is not covered by the insulating reinforcement layer 40; wherein the third insulating protection film 33 has a window 330, and the insulating reinforcement layer 40 and the extension portion 52 are both spaced apart from the window 330 (see Figure 5 , Figure 7 and Fig. 9 ).

[0091] The third insulating protection film 33 is disposed in direct contact with the second side surface 11B. The material of the third insulating protection film 33 may be the same as or different from the material of the first insulating protection film 31 .

[0092] In some examples, the material of the third insulating protection film 33 is the same as that of the first insulating protection film 31 , and the same manufacturing process (ie, integral molding) may be adopted to simplify the process.

[0093] In this embodiment, the third insulating protective film 33 is provided to enhance the insulation effect between the end monomer 110 and other components; and a window 330 is provided on the third insulating protective film 33 to expose part of the second side surface 11B of the end monomer 110, so as to improve the firmness of the adhesion between the second side surface 11B and other components. In addition, the insulating reinforcement layer 40 and the extension portion 52 are both spaced apart from the window 330, so as to reduce the interference of the insulating reinforcement layer 40 and the extension portion 52 with the side adhesive bonding, and facilitate the side adhesive bonding.

[0094] In some embodiments, see Fig.10 The side surface of the end monomer 110 includes two second side surfaces 11B arranged opposite to each other, and the connection points of the first side surface 11A and the two second side surfaces 11B are respectively cross-arranged to form two corners 11C; the insulating reinforcement layer 40 only covers the two corners 11C and the first side surface 11A.

[0095] The insulation reinforcement layer 40 extends from an edge of a second side 11B close to the first side 11A through the first side 11A to an edge of another second side 11B close to the first side 11A, so that the insulation reinforcement layer 40 covers the two corners 11C and the first side 11A, and is beneficial to the thickness uniformity of the insulation reinforcement layer 40.

[0096] In some examples, the first side surface 11A and the second side surface 11B are arranged perpendicularly, and the battery cell 11 is square.

[0097] In this embodiment, the insulating reinforcement layer 40 covers the two corners 11C and the first side 11A, and on the basis of the insulating protection of the insulating protection film 30, a new insulating protection is added between the end plate 20 and the end monomer 110, thereby enhancing the insulating effect between the end plate 20 and the end monomer 110. In addition, the insulating reinforcement layer 40 covers the first side 11A, which is conducive to improving the thickness uniformity of the insulating protection film 30 on the first side 11A, and can reduce the risk of local stress concentration, thereby reducing the possibility of lithium precipitation.

[0098] In some embodiments, see Figure 5 , Fig.11 and Fig.12 The battery device 1 further includes an insulating covering layer 60 , which covers a surface of the end plate 20 facing the end cell 110 .

[0099] In some examples, the thickness of the insulating cover layer 60 is uniform, and the flatness of the surface of the insulating cover layer 60 is the same as that of the end plate 20 , so as to fit the entire surface of the insulating cover 50 .

[0100] In this embodiment, an insulating covering layer 60 is provided on the surface of the end plate 20 facing the end monomer 110. On the basis of the insulating protection of the insulating protection film 30 and the insulating reinforcement layer 40, an additional layer of insulating protection is provided between the end plate 20 and the end monomer 110, thereby further enhancing the insulating effect between the end plate 20 and the end monomer 110.

[0101] In some embodiments, the insulation reinforcement layer 40 is an insulation coating having better damage resistance than the insulation protection film 30 ; and / or the insulation cover layer 60 is an insulation coating having better damage resistance than the insulation protection film 30 .

[0102] Damage resistance refers to wear resistance and / or corrosion resistance.

[0103] In some examples, the insulation reinforcement layer 40 and the insulation cover layer 60 have good wear resistance and corrosion resistance, so that they are not easy to fall off and wear after a long period of use, thereby ensuring their insulation effect.

[0104] In some examples, the material of the insulation reinforcement layer 40 includes, but is not limited to, insulating materials such as acrylate and polyurethane.

[0105] In some examples, the material of the insulating cover layer 60 includes, but is not limited to, insulating materials such as acrylate and polyurethane.

[0106] In some examples, the insulating reinforcement layer 40 may be prepared by methods including but not limited to spraying, electroplating, and the like.

[0107] In some examples, the insulating cover layer 60 can be prepared by methods including but not limited to spraying, electroplating, etc.

[0108] In the present embodiment, the insulating reinforcement layer 40 and / or the insulating covering layer 60 are insulating coatings having better damage resistance than the insulating protective film 30, so as to improve the service life of the insulating reinforcement layer 40 and / or the insulating covering layer 60, so that even if the end plate 20 bends with age / mileage and squeezes the insulating cover 50, regardless of whether the insulating protective film 30 is worn, the risk of insulation failure between the end plate 20 and the battery cell 11 can be reduced due to the presence of the insulating reinforcement layer 40 and / or the insulating covering layer 60.

[0109] The above are only implementation methods of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery assembly, comprising a plurality of battery cells arranged in a stack; An end plate is arranged at the end of the battery assembly along the stacking direction; the battery cell closest to the end plate in the battery assembly is defined as an end cell; the side surface of the end cell includes a first side surface and a second side surface connected to each other, and the connection between the first side surface and the second side surface is cross-arranged to form a corner; the first side surface is arranged toward the end plate; An insulating protective film, covering the side surface of the end monomer; Wherein, the battery device further comprises an insulating reinforcement layer arranged between the insulating protection film and the side surface of the end unit; the insulating reinforcement layer at least covers the corner.

2. The battery device according to claim 1, characterized in that: The side surface of the end monomer includes two second side surfaces arranged opposite to each other, and the connection points of the first side surface and the two second side surfaces are respectively cross-arranged to form two corners; the number of the insulating reinforcement layers is two, one insulating reinforcement layer is arranged at one corner, and the other insulating reinforcement layer is arranged at the other corner.

3. The battery device according to claim 2, characterized in that: The insulating protective film comprises: Two first insulating protective films; the two first insulating protective films and the two insulating reinforcement layers are stacked in a one-to-one correspondence; a second insulating protective film connected between the two first insulating protective films; the second insulating protective film is attached to the first side surface of the end monomer that is not covered by the insulating reinforcement layer; The thickness of the second insulating protection film is equal to the sum of the thicknesses of the first insulating protection film and the insulating reinforcement layer.

4. The battery device according to claim 3, characterized in that: The second insulating protective film comprises: A first insulating protection sub-film layer is attached to the first side surface; the thickness of the first insulating protection sub-film layer is equal to the thickness of the insulating reinforcement layer; The second insulating protection sub-film layer is stacked on a side of the first insulating protection sub-film layer away from the first side surface; the second insulating protection sub-film layer is interconnected with the first insulating protection film and has the same thickness.

5. The battery device according to any one of claims 2 to 4, characterized in that: The battery device further includes an insulating cover, which includes: A main body, disposed between the end plate and the end monomer; An extension portion cross-connected with one side of the main body portion; The projection of the extension portion on the second side surface covers the projection of the insulation reinforcement layer on the second side surface.

6. The battery device according to claim 5, characterized in that: The insulating protective film also includes: a third insulating protection film connected to one of the first insulating protection films and attached to a portion of the second side surface of the end monomer that is not covered by the insulating reinforcement layer; Wherein, the third insulating protection film has a window, and the insulating reinforcement layer and the extension portion are both spaced apart from the window.

7. The battery device according to claim 1, characterized in that: The side surface of the end monomer includes two second side surfaces arranged opposite to each other, and the connection points of the first side surface and the two second side surfaces are respectively cross-arranged to form two corners; the insulating reinforcement layer only covers the two corners and the first side surface.

8. The battery device according to any one of claims 1 to 4 and 7, characterized in that: The battery device further includes an insulating covering layer, which covers a surface of the end plate facing the end cell.

9. The battery device according to claim 8, characterized in that: The insulation reinforcement layer is an insulation coating having better damage resistance than the insulation protection film; and / or, The insulating covering layer is an insulating coating having better damage resistance than the insulating protection film.

10. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 9.

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