Insulating film, battery cell, battery and power consumption equipment

Abstract

To provide a battery cell, a battery, a method for manufacturing a battery cell, and power consumption equipment.SOLUTION: A battery cell of the present invention, includes: a battery core; and an insulating film. The insulating film includes: a bottom surface covering region; and a plurality of first side surface covering regions and a plurality of second side surface regions which are alternately installed. Each side of the bottom surface covering regions is connected to one first side surface covering region and one second side surface region. The first side surface covering region includes a bottom portion shielding portion and two side surface overlapping portions. The bottom side of the bottom portion shielding portion is connected to one side in the bottom surface covering region. The two side surface overlapping portions are coupled to two second side surface covering regions on both sides of the first side surface covering region, and the bottom portion shielding portion of the plurality of first side surface covering regions and a second side covering region are positioned at the same side of the bottom surface covering region in such a manner that the covering regions form a housing space. The two side surface overlapping portions are laminated on the bottom portion shielding portion in such a manner that the two side surface overlapping portions seal the bottom portion of the housing space. The present application can achieve an object of waterproof.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present application relates to the field of battery technology, and in particular to an insulating film, a battery cell, a battery, a method for manufacturing a battery cell, a manufacturing apparatus for a battery cell, and a power consuming device. [Background technology]

[0002] With the increase of environmental pollution, the new energy industry has attracted more and more attention. As a rechargeable lithium-ion secondary battery, it has become an important component of many electronic products, energy storage products and electric vehicles, and its performance directly affects the promotion and use of related products.

[0003] For lithium-ion batteries, to prevent water vapor from penetrating into the interior of the battery cells, a laminate material consisting of one layer of metal and two layers of plastic is typically used to package the battery cells.

[0004] However, the above-mentioned battery cell packaging methods generally cannot solve the waterproof problem in the vertical direction of the battery, so that the waterproof performance of the lithium battery is relatively poor. Summary of the Invention

[0005] The present application provides a battery, a power consuming device, and a method and apparatus for manufacturing the battery, which can reduce safety hazards caused by thermal runaway of the battery.

[0006] The insulating film according to the first aspect of the present application includes a bottom cover region and a plurality of alternating first and second side cover regions, the total number of the first and second side cover regions is equal to the number of sides of the bottom cover region, and each side of the bottom cover region is connected to one of the first and second side cover regions; The first side covering area includes a bottom shielding part and two side overlapping parts, the bottom side of the bottom shielding part is connected to one side of the bottom covering area, and the two side overlapping parts are respectively connected to the two second side covering areas on both sides of the first side covering area; The bottom shielding portions of the multiple first side cover areas and the second side cover areas are all located on the same side of the bottom cover area to form a storage space, and the two side overlap portions are stacked on the bottom shielding portions to seal the bottom of the storage space.

[0007] A first side cover area and a second side cover area, each including a bottom shielding part and two side overlap parts, are alternately arranged on the same side of the bottom cover area, and the bottom shielding part and the adjacent second side cover area are combined with the bottom cover area to form an accommodation space for accommodating battery cells. In addition, by stacking the two side overlap parts on the bottom shielding part, the two side overlap parts are respectively connected to the adjacent second side cover areas, thereby realizing a sealing effect for the accommodation space, and further improving the waterproof performance of the insulating film, thereby achieving the purpose of waterproofing the battery.

[0008] In some embodiments, the two sides of the bottom shielding portion are connected to the two side overlap portions respectively.

[0009] By respectively connecting the two sides of the bottom shielding portion to the two side overlap portions, each part of the insulating film can be connected together, thereby further improving the sealing property of the accommodating space surrounded by the insulating film.

[0010] In some embodiments, the bottom shielding portion includes a middle region and a first side region and a second side region connected to either side of the middle region, a side of the first side region being connected to one of the side overlap portions and a side of the second side region being connected to the other of the side overlap portions; The first side region, the side overlap portion connected to the first side region, the second side region, and the side overlap portion connected to the second side region are all stacked on the intermediate region.

[0011] The side of the first side region is connected to one of the side overlap portions, and the side of the second side region is connected to the other side overlap portion, so that the bottom shielding portion can be integrally connected to the two side overlap portions, thereby improving the sealing of the structure. At the same time, the first side region, the second side region and the side overlap portion are stacked on the middle region, so that the compactness of the structure can be improved and the matching between the shape of the storage space and the battery can be ensured.

[0012] In some embodiments, the side overlap portion includes a joined upper region and a lower region, the lower region covering the entire first side region or the entire second side region; Or, the lower region covers a portion of the first side region or a portion of the second side region, and the remaining portion of the first side region or the remaining portion of the second side region is covered by the upper region.

[0013] Since the lower region partially covers a portion of the first side region or a portion of the second side region, and the remaining portion of the first side region or the remaining portion of the second side region is covered by the upper region, there is also a side overlap portion on the outside of the first side region and the second side region, and the adhesive structure on this side overlap portion can function to fix the side overlap portion onto the intermediate region, thereby improving the robustness of the laminated structure and further improving the sealing property of the insulating film.

[0014] In some embodiments, the upper region and the lower region are integrally connected to the adjacent second side covering region.

[0015] In some embodiments, the total length of the sides of the upper region and the lower region connected to the second side covering region is the same as the length of the corresponding side of the second side covering region and is connected in an aligned manner.

[0016] The integral connection and equal total length can avoid a gap between the side overlap portion and the second side cover area, and achieve the purpose of waterproofing.

[0017] In some embodiments, the upper region is rectangular and the lower region is triangular, and a length of a side of the upper region connected to the lower region is greater than or equal to a length of a side of the lower region connected to the upper region.

[0018] In some embodiments, the length of the side overlap portion from the side away from the connected second side covering region to the other second side covering region is less than a first preset length.

[0019] This ensures that there is a gap between the side overlap portion and the other second side covering area, aiding in lamination and subsequent adhesive sealing of the entire first side covering area.

[0020] In some embodiments, the bottom side of the bottom shielding part and the corresponding side of the bottom cover area have the same length and are connected in an aligned manner.

[0021] The gap between the bottom shielding part and the bottom cover area can be avoided to a certain extent, and the purpose of waterproofing can be achieved.

[0022] In some embodiments, a first adhesive structure is applied to a bottom of the first side covering region, the bottom edge of the first adhesive structure is flush with the bottom edge of the first side covering region, and a second predetermined length is provided between a side edge of the first adhesive structure and a side edge of the first side covering region.

[0023] The first adhesive structure is to achieve the purpose of further sealing the bottom area of ​​the insulating film.

[0024] In some embodiments, the height of the first adhesive structure is greater than the height of the bottom shield.

[0025] This ensures that the first adhesive structure can seal the bottom shielding portion, so that the first adhesive structure achieves the purpose of further sealing the bottom area of ​​the insulating film.

[0026] In some embodiments, the receiving space is for covering a battery core or a battery module.

[0027] In some embodiments, the inner wall of the accommodating space is adhesively connected to the battery core or the battery module.

[0028] The inner wall of the receiving space in the insulating film further needs to be adhesively connected with the battery module, so that the relative fixation between the insulating film and the battery module can be realized.

[0029] In some embodiments, the insulating film material is a waterproof material.

[0030] A battery cell according to a second aspect of the present application includes a battery core and the above-mentioned insulating film, wherein the battery core has a case, and a bottom wall of the case covers a bottom cover area of ​​the insulating film, and a side wall of the case covers a first side cover area and a second side cover area of ​​the insulating film, so that the battery core is at least partially covered by the accommodation space of the insulating film.

[0031] A battery according to a third aspect of the present application includes a plurality of the above-described battery cells.

[0032] A battery according to a fourth aspect of the present application includes the insulating film and a plurality of battery cores, the plurality of battery cores being covered by a storage space of the insulating film, A second adhesive structure for connecting to the adjacent battery core is applied on the first side cover area of ​​the insulating film for covering the battery core.

[0033] In some embodiments, in the height direction of the battery cell, the second adhesive structure is located above the first adhesive structure of the insulating film, and the second adhesive structure and the first adhesive structure are separated by a predetermined distance.

[0034] In some embodiments, the viscosity of the second adhesive structure is greater than the viscosity of the first adhesive structure, and the waterproofing property of the second adhesive structure is less than the waterproofing property of the first adhesive structure.

[0035] In some embodiments, the thickness of the second adhesive structure is greater than the thickness of the first adhesive structure.

[0036] A method for manufacturing a battery cell according to a fifth aspect of the present application includes: Providing a battery core having a case; providing the above-mentioned insulating film for covering the case, wherein a bottom covering area of ​​the insulating film covers a bottom wall of the case, and a first side covering area and a second side covering area of ​​the insulating film cover side walls of the case, so that the case is at least partially covered in the accommodation space of the insulating film.

[0037] A battery cell manufacturing apparatus according to a sixth aspect of the present application includes: A first device for providing a battery core having a case; and a second device for providing the above-mentioned insulating film to cover the case, wherein a bottom covering area of ​​the insulating film covers a bottom wall of the case, and a first side covering area and a second side covering area of ​​the insulating film cover side walls of the case, so that the case is at least partially covered in the accommodation space of the insulating film.

[0038] A power consumption device according to a seventh aspect of the present application includes the battery described above. [Brief description of the drawings]

[0039] In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly describe the drawings necessary for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without paying creative efforts.

[0040] The drawings described herein are intended to provide a further understanding of the present application and constitute a part of the present application, and the illustrative embodiments and the description thereof are intended to interpret the present application and are not to be construed as undue limitations of the present application. [Figure 1A] 1 is a structural schematic diagram of a power consumption device according to an embodiment of the present application; [Figure 1B] FIG. 1 is a structural schematic diagram of a battery according to an embodiment of the present application. [Figure 1C] 1 is a structural schematic diagram of a battery module according to an embodiment of the present application; [Figure 1D] FIG. 2 is a structural schematic diagram of a battery cell according to an embodiment of the present application. [Diagram 2] 1 is a schematic structural diagram of an insulating film according to an embodiment of the present application; [Diagram 3] FIG. 2 is a structural schematic diagram of a first side cover region in an insulating film according to an embodiment of the present application. [Figure 4] FIG. 13 is a structural schematic diagram of another first side covering area according to an embodiment of the present application. [Diagram 5] 1 is a structural schematic diagram of an insulating film provided with a first adhesive structure according to an embodiment of the present application; [Figure 6] FIG. 2 is a structural schematic diagram of an insulating film on which a second adhesive structure is provided according to an embodiment of the present application. [Figure 7] 2 is a flow chart of a method for manufacturing a battery cell according to an embodiment of the present application. [Figure 8] FIG. 2 is a block diagram of a battery cell manufacturing apparatus according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in more detail below in conjunction with the drawings and examples. It should be understood that the specific embodiments described herein are only for interpreting the present application, and are the preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application, and therefore, all equivalent modifications made based on the structure, shape and principle of the present application should be included within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the specification of this application are intended to describe specific embodiments and are not intended to limit the present application. The terms "including", "having" and any variations thereof in the specification, claims and description of the drawings of this application are intended to cover non-exclusive "including".

[0043] An "embodiment" referred to in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase "embodiment" in various places 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. Those skilled in the art can explicitly and implicitly understand that the embodiment described in this specification may be combined with other embodiments.

[0044] The term "and / or" in this specification merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, A and B in combination, and B alone. Also, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0045] In addition, terms such as "first" and "second" in the specification and claims of this application or in the above drawings are intended to distinguish different objects and are not intended to describe a particular order, and may explicitly or implicitly include one or more of the features.

[0046] In the description of this application, unless otherwise specified, the meaning of "plurality" refers to two or more (including two), and similarly, the meaning of "set" refers to two or more (including two).

[0047] In the description of the present application, it should be explained that unless otherwise clearly specified and limited, the terms "attach", "couple" and "connect" should be understood in a broad sense, for example, "couple" or "connection" of a mechanical structure may refer to a physical connection, for example, a physical connection may be a fixed connection, for example, a fixed connection via a fixed member, for example, a fixed connection via a screw, a bolt or other fixed member, a physical connection may be a detachable connection, for example, an interlocking or engageable connection, and a physical connection may be an integral connection, for example, a connection by welding, adhesion or integral molding. "Coupling" or "connection" of a circuit structure may refer to a physical connection, or may refer to an electrical connection or a signal connection, for example, a direct connection, i.e., a physical connection, or an indirect connection via at least one intermediate element (as long as a circuit is connected), or may be an internal communication between two elements, and a signal connection may be a signal connection via a circuit, or a signal connection via a medium, for example, a wireless wave. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0048] In the following embodiments, some directional terms may be used to clearly describe each direction, for example, the coordinate system in FIG. 1D defines each direction of the battery, where the x direction represents the length direction of the battery cell 400, the y direction is perpendicular to the x direction on a horizontal plane and represents the width direction of the battery cell 400, and the z direction is perpendicular to the x and y directions and represents the height direction of the battery. Note that the x direction, y direction, z direction, etc. described above are intended to explain that the expressions of the directions of operation and configuration of each member of the battery in this embodiment are not absolute but relative, and these directions are appropriate when each member of the battery is in the position shown in the figure, but when the positions of these members change, these directions should have different interpretations to accommodate the changes.

[0049] With the same understanding of directions, in the description of this application, the directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the directions or positional relationships shown in the drawings, and are for the convenience or simplification of the description of this application, and do not indicate or imply that the devices or elements referred to have a particular orientation and are required to be constructed and operated in a particular orientation, and should not be understood as limiting this application.

[0050] Rechargeable batteries may also be called secondary batteries or power batteries, and currently widely used rechargeable batteries include, but are not limited to, lithium batteries, such as lithium-sulfur batteries, sodium-lithium ion batteries, or magnesium ion batteries. For convenience of description, rechargeable batteries may also be referred to as batteries in this specification.

[0051] The safety characteristics of a battery are important characteristics for evaluating the battery, and it is necessary to ensure the safety of the battery as much as possible during use or charging.

[0052] A battery is generally constructed by connecting and combining a number of battery cells, and when a battery cell is subjected to an external short circuit, overcharging, nail penetration, plate collision, or other such circumstances, the battery cell is prone to thermal runaway. When a battery cell experiences thermal runaway, emissions are generated inside the battery cell, and the emissions include materials such as high-temperature flue gas (in severe cases, an open flame may occur) and volatile high-temperature electrolyte, and the thermal diffusion of these emissions during emission may cause other battery cells to experience thermal runaway, leading to further accidents such as explosions. As can be understood, emissions from battery cells referred to in this application include, but are not limited to, electrolyte, dissolved or split positive and negative electrode plates, separator fragments, high-temperature and high-pressure gases generated by reactions, flames, and the like.

[0053] The applicant has discovered that when a battery cell experiences thermal runaway, problems such as short-circuiting of surrounding battery cells and high-voltage ignition can occur.

[0054] In response to this problem, the inventor performed insulation treatment on multiple parts inside the battery, but this did not solve the problems of short circuit and high voltage ignition when the battery cell experiences thermal runaway. As a result of further research, the applicant discovered that problems such as short circuit and high voltage ignition due to thermal runaway of the battery cell are caused by exhaust discharged from inside the battery coming into contact with the bus components.

[0055] In view of this, the present application provides a battery that can prevent high-temperature waste from being ejected from a battery cell from scattering onto bus components when the battery cell experiences thermal runaway, thereby reducing the occurrence of problems such as short-circuiting and high-voltage ignition of the battery cell. Therefore, the battery of the present application can timely control the thermal runaway situation of the battery cell, prevent further generation of heat and high-temperature waste, and avoid the high-temperature waste from scattering onto bus components, thereby reducing the occurrence of short-circuiting and high-voltage ignition of the battery cell.

[0056] The battery in the embodiment of the present application can be used in various power consuming devices that can be powered by electric energy. The power consuming devices may be, but are not limited to, electric cars, trains, electric bicycles, golf carts, drones, steamships, etc. The power consuming devices may be devices that are powered only by batteries, or may be hybrid devices. The battery supplies the power consuming devices with electric energy and drives the electric devices through a motor.

[0057] For example, FIG. 1A shows a structural schematic diagram of a power consumption device according to an embodiment of the present application. The power consumption device may be a vehicle, and the vehicle may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, etc. The vehicle includes a battery 200, a controller 210, and a motor 220. The battery 200 is for supplying power to the controller 210 and the motor 220 as the operation power source and driving power source of the vehicle, for example, the battery 200 is for meeting the operating power demand during starting, navigating, and running of the vehicle. For example, the battery 200 supplies power to the controller 210, and the controller 210 controls the battery 200 to supply power to the motor 220, and the motor 220 receives the power of the battery 200 and uses it as the driving power source of the vehicle, providing driving power for the vehicle instead of or partially replacing the fuel oil or natural gas.

[0058] In order to realize a relatively high performance of the battery to meet usage demands, the battery 200 may include a plurality of battery modules connected to each other, and as shown in FIG. 1B , the battery 200 includes a first case 201, a second case 202, and a plurality of battery modules 300, where the first case 201 and the second case 202 are engaged with each other, and the plurality of battery modules 300 are arranged in a space surrounded by the first case 201 and the second case 202.

[0059] As shown in Fig. 1C, the battery module 300 includes a plurality of battery cells 400, which may be connected in a series, parallel, or series-parallel manner to achieve a relatively large current or voltage, and the series-parallel connection refers to a combination of series and parallel connections. Still, as shown in Fig. 1C, the battery cells 400 may be arranged upright, with the height direction of the battery cells 400 coinciding with the z direction and the length direction of the battery cells 400 coinciding with the x direction, and the plurality of battery cells 400 arranged side by side in the y direction along their width direction, or the battery cells 400 may be arranged horizontally, with the width direction of the battery cells 400 coinciding with the z direction and the length direction of the battery cells 400 coinciding with the x direction, and the plurality of battery cells 400 may be stacked in at least one layer along the z direction, with each layer including a plurality of battery cells 400 spaced apart along the x direction.

[0060] In order for those skilled in the art to clearly understand the improvements of the present application, the overall structure of the battery cell 400 will be described first.

[0061] 1D , the battery cell 400 includes a battery core, which includes a case 40, an electrode component 30, and an end cap component 10, which includes an end cap plate 10′, which is connected (e.g., welded) to the case 40 to form a housing of the battery cell 400, the electrode component 30 is installed in the case 40, and the case 40 is filled with an electrolyte. The battery cell 400 may be cubic, rectangular, or cylindrical.

[0062] According to the actual usage demand, one or more electrode components 30 may be installed. As shown in FIG. 1D, at least two independently wound electrode components 30 may be installed in the battery. The electrode component 30 may be formed by winding or stacking together a first electrode plate, a second electrode plate, and a separator located between the adjacent first and second electrodes, and the separator is an insulator between the adjacent first and second electrodes. The main body has two opposing end faces. In this embodiment, the first electrode plate is exemplarily a positive electrode plate, and the second electrode plate is exemplarily a negative electrode plate. The positive electrode active material is coated on the coating area of ​​the positive electrode plate, and the negative electrode active material is coated on the coating area of ​​the negative electrode plate. A plurality of uncoated areas extending from the coating area of ​​the main body are stacked as tabs. The electrode component includes two tabs 301, i.e., a positive electrode tab and a negative electrode tab. A positive tab extends from the painted area of ​​the positive plate and a negative tab extends from the painted area of ​​the negative plate.

[0063] The end cap component 10 is disposed on the top of the electrode component 30. As shown in FIG. 1D , the end cap component 10 includes an end cap plate 10′ and two electrode terminals 5, which are positive and negative terminals, respectively. Each electrode terminal 5 is correspondingly provided with a connecting member 20, and the connecting member 20 is located between the end cap 10′ and the electrode component 30.

[0064] 1D is located at the top, the positive electrode tab is connected to the positive electrode terminal by one connection member 20, and the negative electrode tab is connected to the negative electrode terminal by the other connection member 20. Optionally, the battery cell 400 may include two end cap components 10 respectively installed on both ends of the case 40, with one terminal 5 installed on each end cap component 10.

[0065] An explosion-proof member may be further installed on the end cap plate 10' to timely release the gas in the battery cell 400 when there is too much gas in the battery cell 400 to avoid explosion.

[0066] An exhaust hole is provided on the end cap plate 10', and the exhaust hole may be provided at a midpoint along the length of the end cap 10'. The explosion-proof member includes a pressure relief mechanism 6, which is provided on the exhaust hole, and in a normal state, the pressure relief mechanism 6 is attached to the exhaust hole in a sealed manner, but when the air pressure inside the housing rises above a preset value due to battery expansion, the pressure relief mechanism 6 is activated and opened, and the pressure relief mechanism 6 releases gas to the outside.

[0067] In some embodiments, as shown in Fig. 1D, a through hole is provided on the end cap plate 10' for injecting an electrolyte into the battery core 400, and the through hole may be a circular hole, a conical hole, a polygonal hole, or a hole of other shape, and may extend along the height direction of the end cap plate 10'. A liquid injection member 2 is provided on the end cap plate 10' for sealing the through hole.

[0068] As shown in Figures 2 and 3, an embodiment of the present application provides an insulating film for covering a battery core 400. The insulating film includes a bottom covering area 210, a plurality of alternating first side covering areas 220 and a second side covering area 230, the bottom covering area 210 is for covering the bottom of the battery core 400, the plurality of alternating first side covering areas 220 and second side covering areas 230 are for covering the sides of the battery core 400, the total number of the first side covering areas 220 and the second side covering areas 230 is equal to the number of sides of the bottom covering area 210, and each side of the bottom covering area 210 is connected to one first side covering area 220 or one second side covering area 230, thereby ensuring that the bottom covering area 210 can be substantially seamlessly connected to the first side covering area 220 and the second side covering area 230.

[0069] In the embodiment of the present application, the plurality of first side cover areas 220 and the second side cover areas 230 are all located on the same side of the bottom cover area 210 to form a receiving space. As shown in FIG. 2, the receiving space is for receiving the battery core 400.

[0070] In the embodiment of the present application, the first side covering area 220 includes a bottom shielding portion 221 and two side overlapping portions 222, and in order to realize the connection between the bottom covering area 210 and the first side covering area 220, the bottom edge of the bottom shielding portion 221 is connected to one edge in the bottom covering area 210, and in order to realize the connection between the first side covering area 220 and the second side covering area 230, the two side overlapping portions 222 are respectively connected to the two second side covering areas 230 on both sides of the first side covering area 220.

[0071] Furthermore, the bottom shielding portions 221 and the second side covering areas 230 of the multiple first side covering areas 220 are all located on the same side of the bottom covering area 210 so as to form a storage space, and the two side overlapping portions 222 are stacked on the bottom shielding portion 221 so as to seal the bottom of the storage space, thereby achieving a waterproof function.

[0072] In the insulating film according to the embodiment of the present application, the first side cover area 220 including the bottom shielding portion 221 and the two side overlap portions 222 and the second side cover area 230 are alternately arranged on the same side of the bottom cover area 210, and the bottom shielding portion 221 and the adjacent second side cover area 230 are combined with the bottom cover area 210 to form an accommodating space for accommodating the battery core; and by stacking the two side overlap portions 222 on the bottom shielding portion 221, the two side overlap portions 222 are respectively connected to the adjacent second side cover areas 230, thereby realizing a sealing effect for the accommodating space, and further improving the waterproof performance of the insulating film to achieve the purpose of realizing waterproofing for the battery core.

[0073] In practical application, the above-mentioned connection manner and stacking manner may be determined according to practical circumstances. For example, the bottom shielding part 221 and the second side covering area 230 are respectively integrally connected with the bottom covering area 210, the side overlapping part 222 is integrally connected with the second side covering area 230, and an adhesive structure may be provided on the side of the side overlapping part 222 that is stacked on the bottom shielding part 221, so that it may be stacked on the bottom shielding part 221 by an adhesive manner.

[0074] In the embodiment of the present application, in order to easily fix the battery core in the accommodation space of the insulating film, an adhesive structure may be provided on one side of the insulating film close to the accommodation space, so that the insulating film is adhered onto the battery core. Of course, any other manner that can realize the fixed connection between the battery core and the insulating film is also within the protection scope of the present application.

[0075] In the embodiment of the present application, the two side edges of the bottom shielding portion 221 are respectively connected to the two side overlap portions 222, so that each part of the insulating film can be connected together, thereby further improving the sealing property of the accommodating space surrounded by the insulating film.

[0076] 3, the bottom shielding portion 221 includes a middle region 2211, and a first side region 2212 and a second side region 2213 connected to both sides of the middle region 2211, and a side of the first side region 2212 is connected to one side overlap portion 222, and a side of the second side region 2213 is connected to the other side overlap portion 222. The first side region 2212, the side overlap portion 222 connected to the first side region 2212, the second side region 2213, and the side overlap portion 222 connected to the second side region 2213 are all stacked on the middle region 2211.

[0077] By connecting the side of the first side region 2212 to one side overlap portion 222 and connecting the side of the second side region 2213 to the other side overlap portion 222, the bottom shielding portion 221 can be integrally connected to the two side overlap portions 222, thereby improving the sealing of the structure. At the same time, by stacking the first side region 2212, the second side region 2213 and the side overlap portion 222 on the middle region 2211, the compactness of the structure can be improved and the matching between the shape of the storage space and the battery core can be ensured.

[0078] In addition, an adhesive structure is applied to the middle region 2211 and one side of the side overlap portion 222 close to the battery core, so that the laminated structure can be fixed onto the battery core to achieve the purpose of fixing and sealing.

[0079] In practical applications, the specific structural forms of the bottom shielding portion 221 and the side overlap portion 222 may be installed in multiple types according to actual needs. In addition to the insulating film structure shown in FIG. 3, the embodiment of the present application provides a schematic structural diagram of another insulating film shown in FIG. 4.

[0080] In the insulating film provided in FIG. 4, the side overlap portion 222 includes an upper region 2221 and a lower region 2222 which are connected together, and the lower region 2222 covers a portion of the first side region 2212 or a portion of the second side region 2213, and the remaining portion of the first side region 2212 or the remaining portion of the second side region 2213 is covered by the upper region 2221.

[0081] In the insulating film provided in FIG. 3, the lower region 2222 covers the entire first side region 2212 or the entire second side region 2213 .

[0082] Compared with the insulating film structure shown in FIG. 3, in the insulating film shown in FIG. 4, there is further a side overlap portion 222 outside the first side edge region 2212 and the second side edge region 2213, and the adhesive structure on this side overlap portion 222 can function to fix the side overlap portion 222 onto the intermediate region 2211, thereby improving the robustness of the above-mentioned laminated structure and further improving the sealing property of the insulating film.

[0083] In order to improve the waterproofness of the insulating film and ensure the integration of each component in the insulating film, the above-mentioned upper region 2221 and lower region 2222 are integrally connected to the adjacent second side covering region 230. The total length of the sides of the upper region 2221 and lower region 2222 connected to the second side covering region 230 is the same as the length of the corresponding side of the second side covering region 230, and they are aligned and connected. This can avoid the gap between the side overlap portion 222 and the second side covering region 230 and achieve the purpose of waterproofing. The manner of integral connection may be adhesive connection or integral molding, but is not particularly limited in the embodiment of the present application.

[0084] In one optional embodiment of the embodiment of the present application, the upper region 2221 may be a rectangle, and the lower region 2222 may be a triangle, and the length of the side of the upper region 2221 connected to the lower region 2222 is equal to or greater than the length of the side of the lower region 2222 connected to the upper region 2221. Figure 3 shows a situation where the sides at the connection points of the upper region 2221 and the lower region 2222 are equal, and Figure 4 shows a situation where the side length of the upper region 2221 is greater than the side length of the lower region 2222 at the connection points.

[0085] It should be noted that, in addition to the above structural forms, the upper region 2221 and the lower region 2222 may also have other structural forms, such as trapezoidal, polygonal, etc., and different structural forms may be installed according to actual situations and needs, but the embodiments of the present application are not particularly limited thereto.

[0086] 5, the length D of the side overlap portion 222 from the side far from the second side covering region 230 connected thereto to the other second side covering region 230 is smaller than the first preset length, thereby ensuring that there is a gap between the side overlap portion 222 and the other second side covering region 230, which is helpful for lamination of the entire first side covering region 220 and subsequent adhesive sealing.

[0087] In the embodiment of the present application, in order to further seal the laminated structure, as shown in Fig. 5, a first adhesive structure 510 is applied to the bottom of the first side covering area 220, the bottom side of the first adhesive structure 510 is flush with the bottom side of the first side covering area 220, and a second preset length is ensured between the side of the first adhesive structure 510 and the side of the first side covering area 220. The second preset length should be smaller than the first preset length, thereby ensuring that a part of the first adhesive structure 510 is covered by the side of the side overlap portion 222, and achieving the purpose of sealing the side overlap portion 222.

[0088] In addition, the height of the first adhesive structure 510 needs to be greater than that of the bottom shielding portion 221, so that the first adhesive structure 510 can seal the bottom shielding portion 221. Thereby, the first adhesive structure 510 achieves the purpose of further sealing the bottom area of ​​the insulating film.

[0089] In one embodiment of the present application, the material of the first adhesive structure 510 is:

[0090] Similarly, in order to improve the waterproofing of the insulating film and ensure the integration of each component in the insulating film, the bottom side of the bottom shielding part 221 and the corresponding side of the bottom cover area 210 are the same length and are connected in alignment, thereby avoiding the occurrence of a gap between the bottom shielding part 221 and the bottom cover area 210 and achieving the purpose of waterproofing.

[0091] In the embodiment of the present application, the height of the insulating film is greater than the height of the battery core 400, specifically, the heights of the first side cover area 220 and the second side cover area 230 are greater than the height of the battery core 400, thereby achieving the purpose of waterproofing the entire battery core 400 in the height direction.

[0092] In practical application, in addition to the connection relationship between different parts inside the insulating film, the inner wall of the receiving space in the insulating film also needs to be adhesively connected with the battery core, so as to realize the relative fixation between the insulating film and the battery core. The embodiments of the present application do not particularly limit the specific adhesive parts and adhesive manners.

[0093] In the embodiment of the present application, in addition to covering the battery core, the accommodation space of the insulating film may also cover a battery module 300 composed of multiple battery cores, and the multiple battery cores may be connected in different ways.

[0094] In the actual covering of the battery module 300, the bottom cover area 210 of the insulating film covers the bottom of the battery module 300, and the multiple first side cover areas 220 and second side cover areas 230 cover the sides of the battery module 300, so that the battery module 300 is covered in the storage space.

[0095] The specific structural form of the insulating film is consistent with that of the battery core 400, and will not be described further here. The inner wall of the accommodating space in the insulating film further needs to be adhesively connected with the battery module 300, so that the relative fixation between the insulating film and the battery module 300 can be realized.

[0096] In the embodiment of the present application, the battery core 400 or the battery module 300 is covered with an insulating film, which can achieve both insulating and waterproof functions, and has a relatively low cost and a relatively small occupied space.

[0097] It should be emphasized that the material of the insulating film is a waterproof material. For example, the insulating film is formed by combining a substrate and an adhesive layer, and the substrate may be a polymer material such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, styrene-acrylate copolymer, polystyrene, polyamide, etc., and the adhesive layer may be a polymer material such as acrylic resin, epoxy resin, polyurethane, amino resin, phenolic resin, etc.

[0098] In practical applications, the thickness of the insulating film may be 25 to 400 um, and optionally the thickness of the substrate may be 20 to 200 um, for example, 50 um, and the thickness of the adhesion layer may be 5 to 200 um, for example, 20 um.

[0099] According to another aspect, the embodiment of the present application further provides a battery cell, which includes a battery core and the above-mentioned insulating film, and as shown in Fig. 4, the battery core 400 has a case, and the bottom wall 401 of the case covers the bottom cover area of ​​the insulating film, and the side wall 402 of the case covers the first side cover area and the second side cover area of ​​the insulating film, so that the battery core is at least partially covered by the receiving space of the insulating film. The specific structure type and installation position of the insulating film have been described in detail in the above embodiment, so they will not be further described in this embodiment.

[0100] According to another aspect, the present application further provides a battery, the battery comprising a plurality of the above-mentioned battery cells. The specific structure of the battery cells has been described in detail in the above embodiment, and therefore will not be further described in the present embodiment.

[0101] To summarise, in the battery according to the embodiments of the present application, the battery cell is installed so that the outside of the battery core in the battery cell is covered with an insulating film, thereby providing an insulating effect, preventing the occurrence of short circuits in the battery core and providing a waterproof effect.

[0102] According to another aspect, the present application further provides a battery, the battery including the insulating film described above and a plurality of battery cores, the plurality of battery cores being covered in a receiving space of the insulating film, and the battery cores covered with the insulating film being connected to each other.

[0103] As shown in FIG. 6, a second adhesive structure 610 for connecting to an adjacent battery core 400 is applied on the first side cover area of ​​the insulating film for covering the battery core 400 .

[0104] In the height direction of the battery core 400, the second adhesive structure 610 is located above the first adhesive structure 510 of the insulating film, and the second adhesive structure 610 and the first adhesive structure 510 are separated by a predetermined distance, thereby preventing the first adhesive structure 510 from being torn by the second adhesive structure 610, which has a relatively large strength, pulling on the first adhesive structure 510.

[0105] In one embodiment of the present application, the viscosity of the second adhesive structure 610 is greater than that of the first adhesive structure 510, and the waterproofness of the second adhesive structure 610 is less than that of the first adhesive structure 510. The first adhesive structure 510 mainly plays a role of waterproof sealing, while the second adhesive structure 610 mainly plays a role of connection and fixing.

[0106] In one embodiment of the present application, to test the waterproofness of the second adhesive structure 610, the battery can be placed in a metal container containing 0.3-3.5% salt water, and the height of the salt water is 2-5 mm lower than the total height of the battery; then, the resistance of the battery can be measured with a multimeter; if the measured resistance is greater than a preset threshold, for example 1 Mohm, it is determined that the waterproofness of the second adhesive structure 610 reaches the standard.

[0107] Specifically, in the process of measuring the resistance with a multimeter, one end of the test probe is placed on the surface of the metal cap of the battery, the other end is placed on the surface of the metal container, a voltage of 0.1V is applied, and the resistance result is recorded to complete the resistance measurement.

[0108] In addition, in order to avoid adhesion between the first adhesive structures 510 corresponding to the adjacent battery cores 400, the thickness of the second adhesive structure 610 is greater than that of the first adhesive structure 510. The specific thickness may be determined according to the actual situation, but is not particularly limited thereto in the embodiment of the present application.

[0109] In one embodiment of the present application, the material of the second adhesive structure 610 may be a mixture of at least one of polyurethane and epoxy resin or both.

[0110] According to another aspect, the present application further provides a method for manufacturing a battery cell. As shown in Figure 7, the method for manufacturing a battery cell may include the following steps:

[0111] Step S710, a battery core having a case is provided.

[0112] Step S720: providing the above-mentioned insulating film for covering the case, wherein the bottom covering area of ​​the insulating film covers the bottom wall of the case, and the first side covering area and the second side covering area of ​​the insulating film cover the side walls of the case, so that the case is at least partially covered in the accommodation space of the insulating film.

[0113] The specific details of the manufacturing method of each of the above battery cells have been described in detail in the corresponding battery cell and insulating film embodiments, so they will not be described further here.

[0114] According to another aspect, the present application further provides a battery cell manufacturing apparatus. Referring to FIG. 8, a block diagram of a battery cell manufacturing apparatus according to an embodiment of the present application is shown. As shown in FIG. 8, the battery cell manufacturing apparatus 800 includes: A first device 810 that can be used to provide a battery core having a case; and a second apparatus 820 that can be used to provide the above-mentioned insulating film for covering the case, where the bottom covering area of ​​the insulating film covers the bottom wall of the case, and the first side covering area and the second side covering area of ​​the insulating film cover the side walls of the case, such that the case is at least partially covered in the accommodation space of the insulating film.

[0115] The specific details of the manufacturing equipment for each of the above battery cells have been described in detail in the corresponding battery cell and insulating film embodiments, and therefore will not be described further here.

[0116] According to another aspect, the present application further provides an electric power consuming device, which comprises the above-mentioned battery for supplying electric energy. The specific structure type and working principle of the battery have been described in detail in the above embodiment, and therefore will not be further described in this embodiment.

[0117] The features in each of the above protection themes and each embodiment of the present application can be mutually referenced, and if the structure permits, a person skilled in the art can flexibly combine the technical features in different embodiments to form more embodiments.

[0118] The insulating film, battery cell, battery, battery cell manufacturing method, battery cell manufacturing equipment, and power consumption device according to the present application have been described in detail above. Although the principles and embodiments of the present application are described herein using specific examples, the description of the above examples is only intended to help understand the method and core idea of ​​the present application. It should be noted that those skilled in the art may make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications are also within the scope of protection of the claims of the present application.

Claims

1. A battery cell comprising: a battery core; and an insulating film; The insulating film includes a bottom cover region and a plurality of alternating first and second side cover regions; the total number of the first side coverage areas and the second side coverage areas is equal to the number of sides of the bottom coverage area; Each side of the bottom surface covering area is connected to one of the first side surface covering area or the second side surface covering area; The first side covering area includes a bottom shielding portion and two side overlapping portions; The bottom side of the bottom shielding part is connected to one side of the bottom cover area, and the two side overlap parts are respectively connected to the two second side cover areas on both sides of the first side cover area; The bottom shielding portion and the second side cover portion of the first side cover area are all located on the same side of the bottom cover area to form a storage space, and the two side overlapping portions are stacked on the bottom shielding portion to seal the bottom of the storage space; A battery cell characterized in that the battery core has a case, and a bottom wall of the case covers the bottom cover area of ​​the insulating film, and a side wall of the case covers the first side cover area and the second side cover area of ​​the insulating film, so that the battery core is at least partially covered by the storage space of the insulating film.

2. The battery cell according to claim 1 , wherein the two sides of the bottom shielding portion are respectively connected to the two side overlap portions.

3. The bottom shielding portion includes a middle region and a first side region and a second side region connected to both sides of the middle region, a side of the first side region is connected to one of the side overlap portions, and a side of the second side region is connected to the other of the side overlap portions; 3. The battery cell of claim 2, wherein the first side region, the side overlap portion connected to the first side region, the second side region, and the side overlap portion connected to the second side region are all stacked on the intermediate region.

4. the side overlap portion includes a connected upper region and a lower region, the lower region covering the entire first side region or the entire second side region; or 4. The battery cell of claim 3, wherein the lower region covers a portion of the first side region or a portion of the second side region, and a remaining portion of the first side region or a remaining portion of the second side region is covered by the upper region.

5. 5. The battery cell of claim 4, wherein the upper and lower regions are integrally connected with the adjacent second side cover region.

6. 6. The battery cell according to claim 5, wherein a total length of the sides of the upper region and the lower region connected to the second side cover region is the same as a length of a corresponding side of the second side cover region, and the sides are aligned and connected.

7. The battery cell according to any one of claims 4 to 6, characterized in that the upper region is rectangular, the lower region is triangular, and a length of a side of the upper region connected to the lower region is greater than or equal to a length of a side of the lower region connected to the upper region.

8. The battery cell according to any one of claims 1 to 6, characterized in that the length of the side overlap portion from the side away from the connected second side cover area to the other second side cover area is smaller than a first preset length that ensures adhesive sealing of the entire first side cover area.

9. The battery cell according to any one of claims 1 to 6, wherein a bottom side of the bottom shielding part and a corresponding side of the bottom cover area have the same length and are connected in an aligned manner.

10. The battery cell of any one of claims 1 to 6, characterized in that a first adhesive structure is applied to a bottom of the first side cover region, a bottom edge of the first adhesive structure is flush with a bottom edge of the first side cover region, and a side edge of the first adhesive structure is spaced apart from the side edge of the first side cover region by a second preset length that ensures that a portion of the first adhesive structure is covered by a side edge of the side overlap portion.

11. The battery cell of claim 10 , wherein a height of the first adhesive structure is greater than a height of the bottom shielding portion.

12. The battery cell according to claim 1 , wherein the accommodating space is for covering a battery core or a battery module.

13. The battery cell according to claim 12 , wherein an inner wall of the accommodating space is adhesively connected to the battery core or the battery module.

14. 2. The battery cell according to claim 1, wherein the insulating film is made of a waterproof material.

15. A battery comprising a plurality of battery cells according to any one of claims 1 to 6.

16. A battery comprising the battery cell according to any one of claims 1 to 6, The battery cores are covered in the storage space of the insulating film, a second adhesive structure for connecting to an adjacent battery core is applied on the first side cover area of ​​the insulating film for covering the battery core.

17. 17. The battery of claim 16, wherein in the height direction of the battery core, the second adhesive structure is located above the first adhesive structure of the insulating film, and the second adhesive structure and the first adhesive structure are separated by a predetermined distance.

18. The battery of claim 17 , wherein the viscosity of the second adhesive structure is greater than the viscosity of the first adhesive structure, and the waterproofness of the second adhesive structure is less than the waterproofness of the first adhesive structure.

19. 20. The battery of claim 18, wherein the second adhesive structure has a thickness greater than a thickness of the first adhesive structure.

20. A method for manufacturing a battery cell according to any one of claims 1 to 6, comprising the steps of: Providing a battery core having a case; providing an insulating film for covering the case; Including, a bottom cover area of ​​the insulating film covering a bottom wall of the case, and a first side cover area and a second side cover area of ​​the insulating film covering side walls of the case, so that the case is at least partially covered by the storage space of the insulating film.

21. 20. A power consuming device comprising the battery of claim 16.

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