Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, a plurality of electrode assemblies and an insulating film, the shell is provided with a first side wall located on one side of a first direction, and the first side wall is provided with an electrode terminal; the electrode assemblies are located in the shell and electrically connected with the electrode terminals respectively, the electrode assemblies are arranged in the second direction, the insulating film at least comprises two first film parts, the two first film parts are located on the two sides of the electrode assemblies in the third direction respectively, at least one first film part is provided with a first through hole, and the first through hole extends in the first direction; the first through hole is spaced from the electrode assembly in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. According to the battery monomer provided by the invention, the electrolyte is infiltrated and the air is exhausted through the first through hole, so that the infiltration rate of the electrolyte can be improved, and the air exhausting rate can also be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] Encapsulating the battery cell is a crucial step in battery production. The insulating film covering the cell prevents scratches during assembly into the casing and also provides insulation, preventing safety accidents caused by direct contact between the cell and the casing. In existing technologies, the electrolyte inside the casing can only permeate the cell from bottom to top through wetting holes on the bottom surface of the insulating film. This single wetting channel results in low wetting efficiency. Furthermore, during the formation of individual battery cells, the single venting channel hinders proper gas release. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a battery cell that can not only improve the electrolyte wetting rate, but also increase the venting channels, improve the venting rate, and improve the formation venting effect.

[0004] This application also proposes a battery device having the aforementioned battery cells.

[0005] This application also proposes an electrical device having the above-mentioned battery device.

[0006] A battery cell according to a first aspect of this application includes: a housing having a first sidewall located on one side in a first direction, the first sidewall being provided with electrode terminals; a plurality of electrode assemblies disposed within the housing and electrically connected to the electrode terminals respectively, the plurality of electrode assemblies being arranged along a second direction; and an insulating film covering the outside of the plurality of electrode assemblies and located within the housing; wherein the insulating film includes at least two first film portions, the two first film portions being respectively located on both sides of the electrode assembly along a third direction, at least one first film portion having a first through hole, the first through hole extending along the first direction and spaced apart from the electrode assembly in the third direction, the first direction, the second direction, and the third direction being perpendicular to each other.

[0007] According to the battery cell of the present application embodiment, a first membrane portion covers at least one side of the electrode assembly along a third direction, and the first membrane portion is provided with a first through hole extending in a first direction. Electrolyte can quickly enter the space between the first membrane portion and the electrode assembly through the first through hole extending in the first direction and wet the electrode assembly, which can further improve the wetting rate of the electrolyte. At the same time, the gas generated by the battery cell can be quickly released into the space between the first membrane portion and the electrode assembly and discharged through the first through hole, improving the formation venting effect. On the other hand, the first through hole is spaced apart from the electrode assembly in the third direction, reducing the possibility of the electrode assembly directly contacting the shell, thereby reducing the risk of shell corrosion.

[0008] In some embodiments, two adjacent electrode assemblies are a first electrode assembly and a second electrode assembly, and the surfaces of the first electrode assembly and the second electrode assembly that are opposite to each other are a first surface and a second surface, respectively. A through-hole arrangement region is provided on the first membrane portion between the first surface and the second surface. The first through-hole is arranged in the through-hole arrangement region. The distance between the boundary of the through-hole arrangement region closest to the first surface and the first surface in the second direction is 3 / 5d, and the distance between the boundary of the through-hole arrangement region farthest from the first surface and the first surface in the second direction is 7 / 5d.

[0009] This embodiment reduces the likelihood of the electrode assembly contacting the battery cell casing through the first through hole by setting a through hole arrangement area in the first membrane portion. The distance between the boundary of the through hole arrangement area closest to the first surface and the first surface in the second direction is 3 / 5d, and the distance between the boundary of the through hole arrangement area farthest from the first surface and the first surface in the second direction is 7 / 5d. This reduces the risk of casing corrosion and improves the safety of the battery cell.

[0010] In some embodiments, each of the two first membrane portions is provided with the first through hole.

[0011] This embodiment provides first through holes on both first membrane portions, which can further improve the wetting rate of electrolyte through the first through holes. At the same time, it can also increase the venting channel, improve the venting rate, and improve the venting effect of formation.

[0012] In some embodiments, at least one of the first membrane portions includes a first stacked membrane and a second stacked membrane, at least a portion of the first stacked membrane and at least a portion of the second stacked membrane overlap in the third direction, and the first through hole is provided on both the first stacked membrane and / or the second stacked membrane.

[0013] This embodiment increases the connection strength between the first and second stacked films by having at least a portion of the first stacked film and at least a portion of the second stacked film overlap on the third-direction side of the electrode assembly. It also increases the sealing performance of the first and second stacked films covering the electrode assembly, thereby improving the insulation performance of the electrode assembly.

[0014] In some embodiments, both the first stacked film and the second stacked film are provided with at least one first through hole, and the first through hole of the first stacked film and the second stacked film after overlapping correspond to each other.

[0015] In this embodiment, at least one first through hole is provided on both the first and second stacked films. The first through hole of the first stacked film and the first through hole of the second stacked film correspond to each other. After the first and second stacked films are stacked, they jointly define the first through hole, which can increase the structural stability of the first through hole.

[0016] In some embodiments, the first through hole is a strip-shaped hole extending along the first direction.

[0017] In this embodiment, by designing the first through hole as a strip-shaped hole extending along the first direction, the space in the first direction can be fully utilized, making the area of ​​the first through hole larger. This helps to improve the permeability of the electrolyte or the venting rate, while reducing the possibility of the electrode assembly directly contacting the shell, thereby reducing the risk of shell corrosion.

[0018] In some embodiments, the first through hole is provided in a plurality of directions in the first direction and / or the second direction.

[0019] In this embodiment, multiple first through holes are provided in the first direction and / or the second direction. These multiple first through holes can further increase the wetting rate of the electrolyte and further increase the venting channels, thereby improving the venting rate and the formation venting effect.

[0020] In some embodiments, a plurality of first through holes are provided, and the plurality of first through holes are arranged at intervals along the second direction to form multiple columns, each column being provided with a plurality of first through holes arranged at intervals along the first direction.

[0021] This embodiment sets up multiple first through holes, which are arranged at intervals along the second direction to form multiple columns. Each column is provided with multiple first through holes arranged at intervals along the first direction. The arrangement of the first through holes is reasonably optimized to improve the wetting rate of the electrolyte and the venting effect.

[0022] In some embodiments, the insulating film includes a second membrane portion that covers the side of the electrode assembly opposite to the first sidewall, and the second membrane portion is provided with a second through hole.

[0023] This embodiment can further increase the wetting efficiency of the electrolyte by providing a second through hole in the second membrane portion. At the same time, it can increase the venting channel, improve the venting rate, and improve the formation venting effect, making it less likely that the electrode assembly will directly contact the shell, thereby reducing the risk of shell corrosion.

[0024] In some embodiments, the second through hole includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

[0025] This embodiment provides a second through hole, which can be at least one of a round hole, a square hole, a triangular hole, or a strip hole. The shape of the second through hole can be set according to the different structural characteristics of the round hole, square hole, triangular hole, and strip hole to increase the permeability of the electrolyte or the venting rate.

[0026] In some embodiments, a plurality of second through holes are provided, and the plurality of second through holes are arranged at intervals in the third direction to form multiple rows, each row being provided with a plurality of second through holes arranged at intervals along the second direction.

[0027] This embodiment sets up multiple second through holes, which are arranged in multiple rows in a third direction. Each row has multiple second through holes arranged in a second direction. The arrangement of the second through holes is reasonably optimized to improve the electrolyte wetting rate and venting effect.

[0028] In some embodiments, the battery cell further includes a base plate disposed between the electrode assembly and the second membrane portion, the base plate having a plurality of through holes arranged in a staggered manner from the second through hole.

[0029] In this embodiment, a base plate is provided between the electrode assembly and the second membrane. The base plate has multiple connecting holes, which are staggered with the second through holes of the second membrane. This reduces the probability of carbon powder corroding the shell, thereby reducing the risk of shell corrosion and leakage.

[0030] In some embodiments, the connecting hole includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

[0031] This embodiment provides a connecting hole, including at least one of round holes, square holes, triangular holes, and strip holes. The shape of the connecting hole can be set according to the different structural characteristics of each of the round holes, square holes, triangular holes, and strip holes to increase the permeability of the electrolyte or the venting rate.

[0032] In some embodiments, the connecting hole includes a strip-shaped hole extending along the third direction.

[0033] This embodiment increases the area of ​​the connecting hole by including a strip-shaped hole extending along a third direction, while ensuring the staggered arrangement of the connecting hole and the second connecting hole.

[0034] In some embodiments, a plurality of connecting holes are provided, and the plurality of connecting holes are arranged at intervals along the third direction to form multiple rows, with each row having a plurality of connecting holes arranged at intervals along the second direction.

[0035] In this embodiment, multiple rows of interconnected holes are formed by arranging them at intervals in the first direction, and each row is provided with multiple interconnected holes arranged at intervals in the second direction. The arrangement of the interconnected holes is reasonably optimized so as to improve the wetting rate of the electrolyte and the venting effect.

[0036] In some embodiments, the electrode assembly is a wound electrode assembly.

[0037] In this embodiment, the electrode assembly is configured as a wound electrode assembly, and the first through hole is positioned opposite to the spacing between two adjacent wound electrode assemblies, allowing the electrolyte to smoothly wet the electrode assembly through the first through hole. A battery device according to a second aspect embodiment of this application includes: a battery cell according to the first aspect embodiment of this application described above.

[0038] According to the battery device of the present application embodiment, by setting the above-mentioned battery cell, not only can the wetting rate of the electrolyte be improved, but also the venting channel can be increased, the venting rate can be improved, and the formation venting effect can be improved. On the other hand, the possibility of the electrode assembly directly contacting the casing is reduced, thereby reducing the risk of casing corrosion and thus improving the safety of the battery device.

[0039] An electrical device according to a third aspect of this application includes a battery device according to the second aspect of this application described above.

[0040] According to the embodiments of this application, by setting the above-mentioned battery device, the electrical device can not only improve the electrolyte wetting rate, but also increase the venting channel, improve the venting rate, and improve the formation venting effect. On the other hand, it reduces the possibility of the electrode assembly directly contacting the shell, thereby reducing the risk of shell corrosion and improving the safety of the electrical device.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0042] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0045] Figure 3 These are exploded views of a battery cell according to some embodiments of this application;

[0046] Figure 4 This is a schematic diagram showing the separation of the insulating film and the base plate according to some embodiments of this application;

[0047] Figure 5 This is a schematic diagram illustrating the fit between the insulating film and the base plate according to some embodiments of this application;

[0048] Figure 6 This is a side view of a battery cell according to some embodiments of this application;

[0049] Figure 7 This is a schematic diagram showing the separation of the insulating film and the base plate according to other embodiments of this application;

[0050] Figure 8 This is a schematic diagram illustrating the fit between the insulating film and the base plate according to other embodiments of this application;

[0051] Figure 9 This is a schematic diagram showing the separation of the insulating film and the base plate according to some embodiments of this application;

[0052] Figure 10 This is a side view of a battery cell according to some embodiments of this application.

[0053] Figure label:

[0054] 100. Vehicle; 101. Controller; 102. Motor; 103. Battery assembly; 1031. Housing;

[0055] 10. Battery cells;

[0056] 1. Housing; 11. First sidewall; 111. Electrode terminal; 112. Liquid injection hole;

[0057] 2. Electrode assembly; 211. First electrode assembly; 212. Second electrode assembly; 213. First surface; 214. Second surface;

[0058] 3. Insulating film; 31. Third film section; 33. First film section; 331. First through hole; 34. First stacked film; 35. Second stacked film; 36. Second film section; 361. Second through hole;

[0059] 4. Base plate; 41. Connecting hole. Detailed Implementation

[0060] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0061] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0063] Currently, the application of power batteries is becoming increasingly widespread in the market. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing. Power batteries are a major component of electric vehicles. A power battery consists of individual battery cells, each containing an insulating film that covers the cell. This insulating film prevents the cell from being scratched during installation and also provides insulation, preventing safety accidents caused by direct contact between the cell and the casing. However, the electrolyte inside the casing can only wet the cell from bottom to top through wetting holes on the bottom surface of the insulating film, resulting in low wetting efficiency due to the single wetting channel. Simultaneously, during cell formation and gas generation, the single venting channel hinders the proper venting of the battery cells.

[0064] Based on the above considerations, in order to improve the electrolyte wetting and venting efficiency of battery cells, an insulating membrane is designed. The insulating membrane includes at least two first membrane portions, and at least one first membrane portion is provided with a first through hole. The first through hole extends along a first direction and is spaced apart from the electrode assembly in a third direction. By wetting the electrolyte and venting through the first through hole, not only can the wetting rate of the electrolyte be improved, but also the venting channel can be increased, the venting rate can be improved, and the formation venting effect can be improved.

[0065] In this application, the battery cell may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. The battery cell disclosed in this application can be used as a power source for electrical devices or as an energy storage system for various energy storage elements. The electrical device may be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] For ease of explanation, the following embodiments will be described using a vehicle 100 according to an embodiment of this application as an example.

[0067] Reference Figure 1 , Figure 1 This is a schematic diagram of a vehicle 100 provided in some embodiments of this application. Figure 2This is a schematic diagram of a battery device 103 according to an embodiment of this application. The vehicle 100 can be a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. The battery device 103 is disposed inside the vehicle 100, and can be located at the bottom, front, or rear of the vehicle 100. The battery device 103 can be used to power the vehicle 100; for example, it can serve as the operating power source for the vehicle 100. The vehicle 100 may also include a controller 101 and a motor 102. The controller 101 controls the battery device 103 to supply power to the motor 102, for example, to meet the power needs of the vehicle 100 during startup, navigation, and driving.

[0068] Battery device 103 refers to a single physical module comprising one or more battery cells 10 to provide higher voltage and capacity. Battery device 103 mentioned in this application can be a battery pack. For example, battery device 103 mentioned in this application can include battery modules, etc. Battery device 103 generally includes a housing 1031 for encapsulating one or more battery cells 10. Housing 1031 can prevent liquids or other foreign matter from affecting the charging or discharging of battery cells 10.

[0069] Figure 3 This is an exploded view of a battery cell 10 according to some embodiments of this application; Figure 4 This is a schematic diagram showing the separation of the insulating film 3 and the base plate 4 according to some embodiments of this application. Figure 5 This is a schematic diagram illustrating the fit between the insulating film 3 and the base plate 4 according to some embodiments of this application. Figure 6 This is a side view of a battery cell 10 according to some embodiments of this application. Figure 7 This is a schematic diagram showing the separation of the insulating film 3 and the base plate 4 according to other embodiments of this application. Figure 8 This is a schematic diagram illustrating the engagement of the insulating film 3 and the base plate 4 according to other embodiments of this application. Figure 9 This is a schematic diagram showing the separation of the insulating film 3 and the base plate 4 according to some embodiments of this application. Figure 10 This is a side view of a battery cell 10 according to some embodiments of this application.

[0070] Reference Figure 3According to the first aspect of the present application, the battery cell 10 includes: a housing 1 having a first sidewall 11 located on one side in a first direction X, and an electrode terminal 111 disposed on the first sidewall 11; a plurality of electrode assemblies 2 disposed inside the housing 1 and electrically connected to the electrode terminal 111 respectively, and the plurality of electrode assemblies 2 arranged along a second direction Y; and an insulating film 3 covering the outside of the plurality of electrode assemblies 2 and located inside the housing 1; wherein the insulating film 3 includes at least two first film portions 33, the two first film portions 33 being located on both sides of the electrode assembly 2 along a third direction Z, at least one first film portion 33 having a first through hole 331 extending along a first direction, and the first through hole 331 being spaced apart from the electrode assembly 2 in a third direction, and the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0071] Among them, the battery cell 10 can be square, the first direction X of the battery cell 10 can be understood as the vertical direction of the battery cell 10, the second direction of the battery cell 10 can be understood as the width direction of the battery cell 10, and the third direction of the battery cell 10 can be understood as the length direction of the battery cell 10.

[0072] For example, the housing 1 has a first sidewall 11 located on the side of the first direction X, and the first sidewall 11 is provided with an electrode terminal 111, which is a pole post. The first sidewall 11 can be a cover plate of the battery cell 10.

[0073] An insulating film 3 is wrapped around the outside of the electrode assembly 2. Both the electrode assembly 2 and the insulating film 3 are located inside the housing 1. The insulating film 3 can reduce the risk of short circuit between the electrode assembly 2 and the housing 1.

[0074] The insulating film 3 includes at least two first film portions 33, which are located on both sides of the electrode assembly 2 along the third direction Z. At least one first film portion 33 is provided with a first through hole 331. It can be that one first film portion 33 is provided with a first through hole 331 or both first film portions 33 are provided with a first through hole 331. The first through hole 331 extends along the first direction X and is spaced apart from the electrode assembly 2 in the third direction Z.

[0075] An injection hole 112 is provided on the first sidewall 11 of the housing 1. During the manufacturing process of the battery cell 10, electrolyte needs to be injected into the battery cell 10. When electrolyte is injected into the battery cell 10 through the injection hole 112, the wetting rate of the upper part of the electrode assembly 2 is faster, while the wetting rate of the lower part of the electrode assembly 2 is slower. The first membrane portion 33 is provided with a first through hole 331, through which electrolyte can wet into the interior of the battery assembly 2. The first through hole 331 extends along the first direction X, which can further improve the wetting rate of the electrolyte.

[0076] During the manufacturing process of the battery cell 10, the battery cell 10 will undergo a reaction, and these chemical reactions will produce gas. This process is called formation gas production. These gases can be discharged through the first through hole 331, which can increase the exhaust channel, improve the exhaust rate, and improve the formation exhaust effect.

[0077] The first through-hole 331 is spaced from the electrode assembly 2 in the third direction Z. After the electrolyte passes through the first through-hole 331, it can quickly enter the space between the first membrane 33 and the electrode assembly 2. The larger amount of electrolyte in the space improves the efficiency of electrolyte wetting of the electrode assembly 2. At the same time, the gas generated by the battery cell 10 can be quickly released into the space between the first membrane 33 and the electrode assembly 2 and discharged through the first through-hole 331, improving the formation venting effect. On the other hand, the first through-hole 331 is spaced from the electrode assembly 2 in the third direction Z, reducing the possibility of the electrode assembly 2 directly contacting the housing 1, thereby reducing the risk of corrosion of the housing 1.

[0078] According to the battery cell 10 of this application embodiment, a first membrane portion 33 covers at least one side of the electrode assembly 2 along the third direction Z, and the first membrane portion 33 is provided with a first through hole 331 extending in the first direction X. Electrolyte can enter the space between the first membrane portion 33 and the electrode assembly 2 quickly through the first through hole 331 extending in the first direction X, and wet the electrode assembly 2, which can further improve the wetting rate of the electrolyte. At the same time, the gas generated by the battery cell 10 can be quickly released into the space between the first membrane portion 33 and the electrode assembly 2, and discharged through the first through hole 331, improving the formation venting effect. On the other hand, the first through hole 331 is spaced apart from the electrode assembly 2 in the third direction Z, reducing the possibility of the electrode assembly 2 directly contacting the housing 1, thereby reducing the risk of corrosion of the housing 1.

[0079] In some embodiments, as Figure 3 As shown, the surfaces of the first electrode assembly 211 and the second electrode assembly 212 that are opposite to each other are the first surface 213 and the second surface 214, respectively. A through-hole arrangement area is provided on the first film portion 33 between the first surface 213 and the second surface 214. The first through-hole 331 is arranged in the through-hole arrangement area. The distance between the boundary of the through-hole arrangement area closest to the first surface 213 and the first surface 231 in the second direction Y is 3 / 5d, and the distance between the boundary of the through-hole arrangement area farthest from the first surface 231 and the first surface 213 in the second direction is 7 / 5d.

[0080] For example, a through-hole arrangement area is provided on the first membrane portion 33 between the first surface 213 and the second surface 214. The distance between the closest boundary of the through-hole arrangement area to the first surface 213 and the first surface 231 in the second direction Y is 3 / 5d, and the distance between the farthest boundary of the through-hole arrangement area to the first surface 231 and the first surface 213 in the second direction is 7 / 5d. The through-hole arrangement area can avoid the position where the electrode assembly 2 is widest in the third direction Z, reducing the possibility that the electrode assembly 2 will contact the housing 1 of the battery cell 10 through the first through-hole 331, thereby reducing the risk of corrosion of the housing 1 and improving the safety of the battery cell 10.

[0081] For example, the electrode assembly 2 is a wound electrode assembly. The wound electrode assembly has the widest position in the third direction Z. The first film portion 33 covers the opposite sides of the wound electrode assembly in the third direction Z. A through hole arrangement area is provided on the first film portion 33. The through hole arrangement area avoids the position where the wound electrode assembly has the widest width in the third direction Z, so as to prevent the wound electrode assembly from contacting the housing 1 of the battery cell 10 through the first through hole 331.

[0082] In this embodiment, by providing a through-hole arrangement area in the first membrane portion 33, the distance between the closest boundary of the through-hole arrangement area to the first surface 213 and the first surface 231 in the second direction Y is 3 / 5d, and the distance between the farthest boundary of the through-hole arrangement area and the first surface 213 in the second direction Y is 7 / 5d, the electrode assembly 2 is prevented from contacting the housing 1 of the battery cell 10 through the first through-hole 331, thereby reducing the risk of corrosion of the housing 1 and improving the safety of the battery cell 10.

[0083] In some embodiments, as Figure 3 As shown, electrode assembly 2 is a wound electrode assembly.

[0084] For example, the insulating film 3 covers the outer periphery of the plurality of electrode components 2, the electrode components 2 are wound electrode components, the insulating film 3 covers the outer periphery of the plurality of wound electrode components and is attached to the outer periphery of the wound electrode components, two adjacent wound electrode components have a space between them in the second direction Y, and the first through hole 331 is disposed opposite to the space between them, so that the electrolyte can smoothly wet the electrode components 2 through the first through hole 331.

[0085] The wound electrode assembly is made by stacking positive electrode, separator and negative electrode, and then winding and hot pressing them together.

[0086] In this embodiment, the electrode assembly 2 is configured as a wound electrode assembly, and the first through hole 331 is positioned relative to the space between the two adjacent wound electrode assemblies, so that the electrolyte can smoothly wet the electrode assembly 2 through the first through hole 331.

[0087] In some embodiments, as Figure 3 As shown, each of the two first membrane portions 33 is provided with a first through hole 331.

[0088] In this embodiment, by providing a first through hole 331 on each of the two first membrane portions 33, the wetting rate of the electrolyte through the first through hole 331 can be further improved. At the same time, the exhaust channel can be increased, the exhaust rate can be improved, and the formation exhaust effect can be improved.

[0089] In some embodiments, as Figure 3 As shown, at least one first membrane portion 33 includes a first stacked membrane 34 and a second stacked membrane 35, at least a portion of the first stacked membrane 34 and at least a portion of the second stacked membrane 35 overlap in the third direction Z, and a first through hole 331 is provided on both the first stacked membrane 34 and / or the second stacked membrane 35.

[0090] For example, the first membrane portion 33 may include a first stacked membrane 34 and a second stacked membrane 35, or the two first membrane portions 33 may each include a first stacked membrane 34 and a second stacked membrane 35. At least a portion of the first stacked membrane 34 and at least a portion of the second stacked membrane 35 overlap, which may be a partial overlap of the first stacked membrane 34 and a partial overlap of the second stacked membrane 35, or the entire overlap of the first stacked membrane 34 and the entire overlap of the second stacked membrane 35. The first stacked membrane 34 may be provided with a first through hole 331, or the second stacked membrane 35 may be provided with a first through hole 331, or both the first stacked membrane 34 and the second stacked membrane 35 may be provided with a first through hole 331.

[0091] In this embodiment, by setting at least a portion of the first stacked film 34 and at least a portion of the second stacked film 35 to overlap on the third-direction Z side of the electrode assembly 2, the connection strength of the first stacked film 34 and the second stacked film 35 can be increased, and the sealing performance of the first stacked film 34 and the second stacked film 35 covering the electrode assembly 2 can also be increased, thereby improving the insulation performance of the electrode assembly 2.

[0092] In some embodiments, as Figure 3 , Figure 7 , Figure 10 As shown, at least one first through hole 331 is provided on both the first stacked film 34 and the second stacked film 35. The first through hole 331 of the first stacked film 34 and the first through hole 331 of the second stacked film 35 correspond to each other. When multiple first through holes 331 are provided on the first stacked film 34 and the second stacked film 35 respectively, at least a portion of the first through holes 331 on the first stacked film 34 corresponds one-to-one with at least a portion of the first through holes 331 on the second stacked film 35.

[0093] For example, a first through hole 331 may be provided on both the first stacked film 34 and the second stacked film 35, and multiple first through holes 331 may also be provided on both the first stacked film 34 and the second stacked film 35. The first through holes 331 of the first stacked film 34 and the first through holes 331 of the second stacked film 35 correspond to each other after the stacking.

[0094] Multiple first through holes 331 can also be provided on both the first stacked membrane 34 and the second stacked membrane 35. The first through holes 331 on the first stacked membrane 34 can correspond one-to-one with the first through holes 331 on the second stacked membrane 35, or all the first through holes 331 on the first stacked membrane 34 can correspond one-to-one with all the first through holes 331 on the second stacked membrane 35. After the first stacked membrane 34 and the second stacked membrane 35 are stacked, the first through holes 331 are defined together, which can increase the structural stability of the first through holes 331.

[0095] In this embodiment, at least one first through hole 331 is provided on both the first stacked film 34 and the second stacked film 35. The first through hole 331 of the first stacked film 34 and the first through hole 331 of the second stacked film 35 correspond to each other. After the first stacked film 34 and the second stacked film 35 are stacked, they jointly define the first through hole 331, which can increase the structural stability of the first through hole 331.

[0096] In some embodiments, as Figure 3 , Figure 7 , Figure 10 As shown, the number of first through holes 331 on the first stacked film 34 is greater than the number of first through holes 331 on the second stacked film 35, or the number of first through holes 331 on the first stacked film 34 is less than the number of first through holes 331 on the second stacked film 35, or the number of first through holes 331 on the first stacked film 34 is equal to the number of first through holes 331 on the second stacked film 35.

[0097] For example, the number of first through holes 331 on the first stacked film 34 is greater than the number of first through holes 331 on the second stacked film 35. After the first stacked film 34 and the second stacked film 35 are overlapped, all the first through holes 331 on the second stacked film 35 may correspond to a portion of the first through holes 331 on the first stacked film 34; or a portion of the first through holes 331 on the first stacked film 34 may correspond to a portion of the first through holes 331 on the second stacked film 35.

[0098] The number of first through holes 331 on the first stacked film 34 is less than the number of first through holes 331 on the second stacked film 35. After the first stacked film 34 and the second stacked film 35 are overlapped, all the first through holes 331 on the first stacked film 34 may correspond to a portion of the first through holes 331 on the second stacked film 35; or a portion of the first through holes 331 on the first stacked film 34 may correspond to a portion of the first through holes 331 on the second stacked film 35.

[0099] The number of first through holes 331 on the first stacked film 34 is equal to the number of first through holes 331 on the second stacked film 35. After the first stacked film 34 and the second stacked film 35 are overlapped, all the first through holes 331 on the first stacked film 34 can correspond to all the first through holes 331 on the second stacked film 35; or a portion of the first through holes 331 on the first stacked film 34 can correspond to a portion of the first through holes 331 on the second stacked film 35.

[0100] In this embodiment, different or the same number of first through holes 331 are respectively provided in the first stacked film 34 and the second stacked film 35. After the first stacked film 34 and the second stacked film 35 are stacked, different or the same number of first through holes 331 can be constructed.

[0101] In some embodiments, as Figure 3 , Figure 4 , Figure 7 As shown, each of the two first membrane portions 33 includes a first stacked membrane 34 and a second stacked membrane 35. Each of the two first stacked membranes 34 is provided with a first through hole 331, and the number of first through holes 331 provided on the two first stacked membranes 34 is equal or unequal; and / or, each of the two second stacked membranes 35 is provided with a first through hole 331, and the number of first through holes 331 provided on the two second stacked membranes 35 is equal or unequal.

[0102] For example, the insulating film 3 further includes two third film portions 31, which respectively cover opposite sides of the plurality of electrode assemblies 2 in the second direction Y. The number of first through holes 331 provided on the two first stacked films 34 may be equal or unequal. It is possible that the number of first through holes 331 connected to one side of the third film portion 31 is greater than the number of first through holes 331 connected to the other side of the third film portion 31; it is also possible that the number of first through holes 331 connected to one side of the third film portion 31 is equal to the number of first through holes 331 connected to the other side of the third film portion 31; it is also possible that the number of first through holes 331 connected to one side of the third film portion 31 is less than the number of first through holes 331 connected to the other side of the third film portion 31.

[0103] Alternatively, one of the third membrane portions 31 is connected to a first stacked membrane 34 on both sides of the third direction Z, and the other third membrane portion 31 is connected to a second stacked membrane 35 on both sides of the third direction Z. The first stacked membrane 34 and the second stacked membrane 35 located on the same side of the third direction Z overlap. After overlapping, at least a portion of the first through hole 331 of the first stacked membrane 34 can correspond to at least a portion of the first through hole 331 of the second stacked membrane 35.

[0104] In this embodiment, by including a first stacked membrane 34 and a second stacked membrane 35 in both first membrane portions 33, and by providing equal or unequal numbers of first through holes 331 on the two first stacked membranes 34 and the second stacked membrane 35, different arrangements of the first through holes 331 can be achieved.

[0105] In some examples, the shape of the first through hole 331 of the first stacked film 34 is the same as or different from the shape of the first through hole 331 of the second stacked film 35. For example, the shape of the first through hole 331 of the first stacked film 34 is triangular, etc., and the shape of the first through hole 331 of the second stacked film 35 is strip-shaped, etc.; or, the shapes of the first through hole 331 of the first stacked film 34 and the first through hole 331 of the second stacked film 35 are both triangular or strip-shaped, etc.

[0106] After the first stacked film 34 and the second stacked film 35 are overlapped, the shapes of the two overlapping first through holes 331 can be the same or different. They can be triangular first through holes 331 corresponding to square first through holes 331, or square first through holes 331 corresponding to square first through holes 331.

[0107] In some embodiments, as Figure 3 , Figure 4 , Figure 7 As shown, the first through hole 331 is a strip-shaped hole extending along the first direction.

[0108] In this embodiment, the first through hole 331 is designed as a strip-shaped hole extending along the first direction, which can make full use of the space in the first direction, making the area of ​​the first through hole 331 larger. This helps to improve the permeability of the electrolyte or the venting rate, while reducing the possibility of the electrode assembly 2 directly contacting the housing 1, thereby reducing the risk of corrosion of the housing 1.

[0109] In some embodiments, as Figure 3 , Figure 7 , Figure 10 As shown, the first through hole 331 has multiple holes in the first direction X and / or the second direction Y.

[0110] For example, multiple first through holes 331 are provided in the first direction X, or multiple first through holes 331 are provided in the third direction Z, or multiple first through holes 331 are provided in both the first direction X and the third direction Z. Multiple first through holes 331 are arranged in a row and column manner. Multiple first through holes 331 can further increase the wetting rate of electrolyte and further increase the venting channel, improve the venting rate, and improve the venting effect of formation.

[0111] In this embodiment, multiple first through holes 331 are provided in the first direction X and / or the second direction Y. The multiple first through holes 331 can further increase the wetting rate of the electrolyte and further increase the exhaust channel, thereby improving the exhaust rate and the formation exhaust effect.

[0112] In some embodiments, as Figure 3 , Figure 7 , Figure 10 As shown, multiple first through holes 331 are provided, and multiple first through holes 331 are arranged at intervals along the second direction Y to form multiple columns, and each column is provided with multiple first through holes 331 arranged at intervals along the first direction X.

[0113] For example, multiple first through holes 331 are arranged in multiple rows at intervals in the second direction Y. For example, two, three, four, or five rows of first through holes 331 are provided on the first membrane portion 33, and each row is provided with multiple first through holes 331, such as two, three, or four first through holes 331 per row. The number of rows of first through holes 331 and the number of first through holes 331 in each row can be set according to the volume of the battery cell 10 to improve the electrolyte wetting rate and venting effect.

[0114] In this embodiment, multiple first through holes 331 are provided, and the multiple first through holes 331 are arranged at intervals along the second direction Y to form multiple columns. Each column is provided with multiple first through holes arranged at intervals along the first direction X. The arrangement of the first through holes 331 is reasonably optimized so that the wetting rate of the electrolyte and the venting effect are better, and the possibility of the electrode assembly 2 directly contacting the shell 1 is lower, thereby reducing the risk of corrosion of the shell 1.

[0115] In some embodiments, as Figure 3 , Figure 7 , Figure 10 As shown, each column is provided with multiple first through holes 331, and the multiple first through holes 331 of two adjacent columns correspond one-to-one in the second direction Y.

[0116] In this embodiment, by setting two adjacent columns of first through holes 331 to correspond one-to-one in the second direction Y, the first through holes 331 are arranged in a regular manner, which facilitates the processing and manufacturing of the first through holes 331.

[0117] In some embodiments, as Figure 3 Figure 4 , Figure 7 , Figure 10 As shown, the insulating film 3 includes a second film portion 36, which covers the side of the electrode assembly 2 opposite to the first sidewall 11, and the second film portion 36 is provided with a second through hole 361.

[0118] For example, the second membrane portion 36 covers the bottom of the electrode assembly 2. When electrolyte is injected into the battery cell 10, a portion of the electrolyte can wet the electrode assembly 2 through the second through hole 361. At the same time, the gas generated by the battery cell 10 can also be discharged through the second through hole 361, which can further increase the wetting efficiency of the electrolyte, increase the exhaust channel, improve the exhaust rate, and improve the formation exhaust effect.

[0119] In this embodiment, by providing a second through hole 361 in the second membrane portion 36, the wetting efficiency of the electrolyte can be further increased, and at the same time, the venting channel can be increased, the venting rate can be improved, and the formation venting effect can be improved.

[0120] In some embodiments, as Figure 5 , Figure 8 As shown, the second through hole 361 includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

[0121] For example, the second through hole 361 may include one of round holes, square holes, triangular holes, and strip holes, or two of round holes, square holes, triangular holes, and strip holes, or three of round holes, square holes, triangular holes, and strip holes, or all of round holes, square holes, triangular holes, and strip holes.

[0122] Round holes have the advantages of high structural strength and simple processing technology; square holes and triangular holes are arranged in a relatively dense manner, while strip holes help to improve the permeability of electrolyte or the venting rate.

[0123] In this embodiment, the second through hole 361 is provided, including at least one of round hole, square hole, triangular hole, and strip hole. The shape of the second through hole 361 can be set according to the different structural characteristics of the round hole, square hole, triangular hole, and strip hole to increase the permeability of electrolyte or the venting rate.

[0124] In some embodiments, as Figure 5 , Figure 8 As shown, multiple second through holes 361 are provided, and multiple second through holes 361 are arranged at intervals in the third direction Z to form multiple rows. Each row is provided with multiple second through holes 361 arranged at intervals along the second direction Y.

[0125] For example, multiple rows of second through holes 361 are spaced apart in the third direction Z. For instance, two, three, four, or five rows of second through holes 361 are provided on the insulating film 3, with multiple second through holes 361 in each row, such as two, three, or four second through holes 361 per row. The number of rows of second through holes 361 and the number of second through holes 361 in each row can be set according to the volume of the battery cell 10 to improve the electrolyte wetting rate and venting effect.

[0126] In this embodiment, multiple second through holes 361 are provided, and the multiple second through holes 361 are arranged in multiple rows in the third direction Z. Each row is provided with multiple second through holes 361 arranged in the second direction. The arrangement of the second through holes 361 is reasonably optimized so as to improve the wetting rate of electrolyte and the venting effect.

[0127] In some embodiments, as Figure 4 Figure 5 , Figure 7-Figure 8 As shown, the battery cell 10 also includes a base plate 4, which is disposed between the electrode assembly 2 and the second membrane portion 36. The base plate 4 has a plurality of connecting holes 41, which are staggered from the second through hole 361.

[0128] For example, there is a micro-gap between the second membrane portion 36 and the base plate 4. The electrolyte can be infiltrated into the second membrane portion 36 through the second through hole 361, and infiltrated into the electrode assembly 2 through the gap between the second membrane portion 36 and the base plate 4 and through the connecting hole 41. At the same time, the gas in the electrode assembly 2 can be discharged through the connecting hole 41 to the space between the second membrane portion 36 and the connecting hole 41, and then discharged to the outside of the housing 1 through the second through hole 361.

[0129] When the battery cell 10 is working, the carbon powder of the anode of the electrode assembly 2 will accumulate on the base plate 4. Since the connecting hole 41 on the base plate 4 and the second through hole 361 on the second membrane 36 are misaligned, that is, the connecting hole 41 and the second through hole 361 do not overlap in the first direction X, the possibility of carbon powder on the base plate 4 falling onto the bottom wall of the housing 1 is reduced, the probability of carbon powder corroding the housing 1 is reduced, and thus the risk of corrosion and leakage of the housing 1 is reduced.

[0130] In this embodiment, a base plate 4 is provided between the electrode assembly 2 and the second membrane 36. The base plate 4 has multiple connecting holes 41, which are staggered with the second through holes 361 of the second membrane 36. This reduces the probability of carbon powder corroding the shell 1, thereby reducing the risk of corrosion and leakage of the shell 1.

[0131] In some embodiments, as Figure 4 , Figure 7As shown, the connecting hole 41 includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

[0132] For example, the connecting hole 41 may include one of the following: round hole, square hole, triangular hole, and strip hole; it may also include two of the following: round hole, square hole, triangular hole, and strip hole; it may also include three of the following: round hole, square hole, triangular hole, and strip hole; or it may include all of the following: round hole, square hole, triangular hole, and strip hole.

[0133] Round holes have the advantages of high structural strength and simple processing technology; square holes and triangular holes are arranged in a relatively dense manner, while strip holes help to improve the permeability of electrolyte or the venting rate.

[0134] In this embodiment, the connecting hole 41 is provided, including at least one of round hole, square hole, triangular hole, and strip hole. The shape of the connecting hole 41 can be set according to the different structural characteristics of the round hole, square hole, triangular hole, and strip hole to increase the permeability of electrolyte or the exhaust rate.

[0135] In some embodiments, as Figure 4 , Figure 7 As shown, the connecting hole 41 includes a strip-shaped hole extending along the third direction Z.

[0136] In this embodiment, by setting the connecting hole 41 to include a strip-shaped hole extending along the third direction Z, the area of ​​the connecting hole 41 is increased while ensuring the staggered arrangement of the connecting hole 41 and the second connecting hole 361.

[0137] In some embodiments, as Figure 4 , Figure 7 As shown, multiple connecting holes 41 are provided, and the multiple connecting holes 41 are arranged at intervals in the third direction Z to form multiple rows. Each row is provided with multiple connecting holes 41 arranged at intervals along the second direction Y.

[0138] For example, multiple through holes 41 are arranged in multiple rows spaced apart in the third direction Z. For instance, two, three, four, or five rows of second through holes 361 are provided on the second membrane portion 36. Each row has multiple through holes 41 spaced apart along the second direction Y. Each row may have one through hole 41 or multiple through holes 41, such as two, three, or four through holes 41 per row. The number of rows of second through holes 361 and the number of through holes 41 per row can be set according to the volume of the battery cell 10 to improve the electrolyte wetting rate and venting effect.

[0139] In this embodiment, multiple rows of connecting holes 41 are formed by arranging them at intervals in the first direction X. Each row is provided with multiple connecting holes 41 arranged at intervals along the second direction Y. The arrangement of the connecting holes 41 is reasonably optimized so as to improve the wetting rate of the electrolyte and the venting effect.

[0140] In some embodiments, as Figure 4 , Figure 7 As shown, each row has multiple connecting holes 41, and the multiple connecting holes 41 in two adjacent rows correspond one-to-one in the third direction Z.

[0141] In this embodiment, by setting two adjacent rows of connecting holes 41 to correspond one-to-one in the third direction Z, the connecting holes 41 are arranged in a regular manner, which facilitates the processing and manufacturing of the second through hole 361.

[0142] In some embodiments, as Figure 3 As shown, electrode assembly 2 is a wound electrode assembly.

[0143] For example, the insulating film 3 covers the outer periphery of the plurality of electrode components 2, the electrode components 2 are wound electrode components, the insulating film 3 covers the outer periphery of the plurality of wound electrode components and is attached to the outer periphery of the wound electrode components, two adjacent wound electrode components have a space between them in the second direction Y, and the first through hole 331 is disposed opposite to the space between them, so that the electrolyte can smoothly wet the electrode components 2 through the first through hole 331.

[0144] The wound electrode assembly is made by stacking positive electrode, separator and negative electrode, and then winding and hot pressing them together.

[0145] In this embodiment, the electrode assembly 2 is configured as a wound electrode assembly, and the first through hole 331 is positioned relative to the space between the two adjacent wound electrode assemblies, so that the electrolyte can smoothly wet the electrode assembly 2 through the first through hole 331.

[0146] The battery device 103 according to the second aspect of this application includes: a battery cell according to the first aspect of this application described above.

[0147] According to the battery device 103 of the present application embodiment, by setting the above-mentioned battery cell 10, not only can the wetting rate of the electrolyte be increased, but also the venting channel can be increased, the venting rate can be increased, and the formation venting effect can be improved. On the other hand, the possibility of the electrode assembly 2 directly contacting the housing 1 is reduced, thereby reducing the risk of corrosion of the housing 1 and improving the safety of the battery device 103.

[0148] An electrical device according to a third aspect of this application includes a battery device 103 according to the second aspect of this application described above.

[0149] According to the embodiments of this application, by providing the battery device 103, the wetting rate of the electrolyte can be increased, the venting channel can be increased, the venting rate can be increased, and the formation venting effect can be improved. On the other hand, the possibility of the electrode assembly 2 directly contacting the housing 1 is reduced, thereby reducing the risk of corrosion of the housing 1 and improving the safety of the electrical device.

[0150] The following will refer to Figures 1-10 A battery cell 10 according to a specific embodiment of this application is described.

[0151] The battery cell 10 includes a housing 1, multiple electrode assemblies 2, and an insulating film 3. The insulating film 3 covers the outside of the electrode assemblies 2 and is located inside the housing 1. The housing 1 has a first sidewall 11 located on one side in a first direction X, and electrode terminals 111 are provided on the first sidewall 11. The electrode assemblies 2 are located inside the housing 1, and the insulating film 3 covers the outside of the electrode assemblies 2 and is located inside the housing 1. The insulating film 3 includes at least two first film portions 33, which are respectively located on both sides of the electrode assembly 2 along a third direction Z. The two first film portions 33 are provided with first through holes 331, which extend along the first direction X and are spaced apart from the electrode assemblies 2 in the third direction Z. The insulating film 3 includes a second film portion 36, which covers the side of the electrode assembly 2 opposite to the first sidewall 11, and the second film portion 36 is provided with a second through hole 361.

[0152] The insulating film 3 further includes two third film portions 31 covering both sides of the electrode assembly 2 in the second direction Y. One of the third film portions 31 is connected to a first stacked film 34 on both sides of the third direction Z, and the other third film portion 31 is connected to a second stacked film 35 on both sides of the third direction Z. At least a portion of the first stacked film 34 and at least a portion of the second stacked film 35 are adapted to overlap on the side of the electrode assembly 2 in the third direction Z. The first stacked film 34 and / or the second stacked film 35 are each provided with a first through hole 331. When the first stacked film 34 and the second stacked film 35 are respectively provided with a plurality of first through holes 331, at least a portion of the first through holes 331 on the first stacked film 34 corresponds one-to-one with at least a portion of the first through holes 331 on the second stacked film 35.

[0153] The two adjacent electrode assemblies 2 may include a first electrode assembly 211 and a second electrode assembly 212. The surfaces of the first electrode assembly 211 and the second electrode assembly 212 that are opposite to each other are a first surface 213 and a second surface 214, respectively. A through-hole arrangement area is provided on the first film portion 33 between the first surface 213 and the second surface 214. The distance between the boundary of the through-hole arrangement area closest to the first surface 213 and the first surface 211 in the second direction is 3 / 5d, and the distance between the boundary of the through-hole arrangement area farthest from the first surface 213 and the first surface 213 in the second direction is 7 / 5d, where d is the thickness of the electrode assembly 2 in the second direction Y.

[0154] The first through hole 331 is a strip-shaped hole extending along the first direction X. Multiple first through holes 331 are provided, and multiple first through holes 331 are arranged at intervals along the second direction Y to form multiple columns. Each column is provided with multiple first through holes 331 arranged at intervals along the first direction X.

[0155] The second through hole 361 includes at least one of a circular hole or a strip hole. Multiple second through holes 361 are provided, and the multiple second through holes 361 are arranged at intervals in the third direction Z to form multiple rows, and each row is provided with multiple second through holes 361 arranged at intervals along the second direction Y.

[0156] The battery cell 10 also includes a base plate 4, which is disposed between the electrode assembly 2 and the second membrane portion 36. The base plate 4 has a plurality of connecting holes 41, which are staggered from the second through holes 361. The connecting holes 41 include at least one of circular holes or strip holes. There are multiple connecting holes 41, which are arranged in multiple rows in the third direction Z, and each row has multiple connecting holes 41 arranged in the second direction Y.

[0157] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0158] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (10), characterized in that, include: The housing (1) has a first sidewall (11) located on one side in a first direction, and the first sidewall (11) is provided with electrode terminals (111); Multiple electrode assemblies (2) are disposed within the housing (1) and electrically connected to the electrode terminals (111) respectively. The multiple electrode assemblies (2) are arranged along a second direction. An insulating film (3) is wrapped around the outside of the plurality of electrode assemblies (2) and located inside the housing (1); The insulating film (3) includes at least two first film portions (33), which are located on both sides of the electrode assembly (2) along a third direction. At least one first film portion (33) is provided with a first through hole (331), which extends along the first direction and is spaced apart from the electrode assembly (2) in the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

2. The battery cell (10) according to claim 1, characterized in that, The two adjacent electrode assemblies (2) are a first electrode assembly (211) and a second electrode assembly (212). The surfaces of the first electrode assembly (211) and the second electrode assembly (212) that are opposite to each other are a first surface (213) and a second surface (214), respectively. A through-hole arrangement area is provided on the first membrane portion (33) between the first surface (213) and the second surface (214). The first through hole (331) is arranged in the through-hole arrangement area. The distance between the boundary of the through-hole arrangement area closest to the first surface (213) and the first surface (213) in the second direction is 3 / 5d, and the distance between the boundary of the through-hole arrangement area farthest from the first surface (213) and the first surface (213) in the second direction is 7 / 5d, where d is the thickness of the electrode assembly (2) in the second direction.

3. The battery cell (10) according to claim 1, characterized in that, Both of the first membrane portions (33) are provided with the first through hole (331).

4. The battery cell (10) according to claim 1, characterized in that, At least one of the first membrane portions (33) includes a first stacked membrane (34) and a second stacked membrane (35), at least a portion of the first stacked membrane (34) and at least a portion of the second stacked membrane (35) are stacked in the third direction, and the first through hole (331) is provided on both the first stacked membrane (34) and / or the second stacked membrane (35).

5. The battery cell (10) according to claim 4, characterized in that, Both the first stacked film (34) and the second stacked film (35) are provided with at least one first through hole (331), and the first through hole (331) of the first stacked film (34) and the second stacked film (35) after being overlapped correspond to each other.

6. The battery cell (10) according to claim 1, characterized in that, The first through hole (331) is a strip-shaped hole extending along the first direction.

7. The battery cell (10) according to claim 1, characterized in that, The first through hole (331) is provided in multiple directions in the first direction and / or the second direction.

8. The battery cell (10) according to claim 7, characterized in that, The first through hole (331) is provided in multiple ways, and the multiple first through holes (331) are arranged at intervals along the second direction to form multiple columns, and each column is provided with multiple first through holes (331) arranged at intervals along the first direction.

9. The battery cell (10) according to claim 1, characterized in that, The insulating film (3) includes a second film portion (36), which covers the side of the electrode assembly (2) opposite to the first sidewall (11), and the second film portion (36) is provided with a second through hole (361).

10. The battery cell (10) according to claim 9, characterized in that, The second through hole (361) includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

11. The battery cell (10) according to claim 9, characterized in that, The second through hole (361) is provided in multiple rows, and the multiple second through holes (361) are arranged at intervals in the third direction to form multiple rows, and each row is provided with multiple second through holes (361) arranged at intervals along the second direction.

12. The battery cell (10) according to claim 9, characterized in that, The battery cell (10) also includes a base plate (4), which is disposed between the electrode assembly (2) and the second membrane portion (36). The base plate (4) is provided with a plurality of connecting holes (41), which are staggered from the second through hole (361).

13. The battery cell (10) according to claim 12, characterized in that, The connecting hole (41) includes at least one of a round hole, a square hole, a triangular hole, and a strip hole.

14. The battery cell (10) according to claim 12, characterized in that, The connecting hole (41) includes a strip-shaped hole extending along the third direction.

15. The battery cell (10) according to claim 12, characterized in that, The connecting holes (41) are provided in multiple rows, and the multiple connecting holes (41) are arranged at intervals along the third direction to form multiple rows, and each row is provided with multiple connecting holes (41) arranged at intervals along the second direction.

16. The battery cell (10) according to any one of claims 1-15, characterized in that, The electrode assembly (2) is a wound electrode assembly.

17. A battery device, characterized in that, include: The battery cell (10) according to any one of claims 1-16.

18. An electrical appliance, characterized in that, include: The battery device according to claim 17.

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