Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrolyte and an insulating film; the shell is provided with a containing cavity; the electrode assembly is arranged in the accommodating cavity; the electrolyte is used for infiltrating the electrode assembly; the insulating film wraps the electrode assembly and comprises a bottom film arranged at the bottom end of the electrode assembly in the gravity direction, a diversion trench is formed in the surface of the side, facing the electrode assembly, of the bottom film and used for containing electrolyte, the insulating film comprises a side film, and the side film is connected to the periphery of the bottom film and surrounds the electrode assembly. The thickness of the bottom film is larger than that of the side film of the insulating film, one surface of the bottom film in the thickness direction is attached to the electrode assembly, and the other surface of the bottom film in the thickness direction is attached to the bottom wall of the shell. The utility model aims to improve the electrolyte infiltration effect of the electrode assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] With the rise of new energy equipment represented by new energy vehicles, a battery device has become a key power source. The battery device comprises a box body, a battery monomer is accommodated in the box body, the battery monomer is an energy storage component and can be used for charging and discharging reactions, an electrode assembly is arranged in the battery monomer, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a separator between the two, and an insulating film is further wrapped around the periphery of the electrode assembly. The insulating film plays a protective role on the electrode assembly. However, due to the existence of the insulating film, the electrolyte infiltration effect of the electrode assembly is affected to some extent, especially the electrode assembly is pressed on the insulating film on the bottom side in the direction of gravity, so that the electrolyte is difficult to better infiltrate the electrode assembly on the bottom. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the application provides a battery monomer, a battery device and a power utilization device, which aims to improve the electrolyte infiltration effect of the electrode assembly.

[0004] To solve the above problems, in a first aspect, the application provides a battery monomer, which comprises:

[0005] a shell, the shell having a cavity;

[0006] an electrode assembly arranged in the cavity;

[0007] an electrolyte for infiltrating the electrode assembly; and

[0008] an insulating film wrapped around the electrode assembly, the insulating film comprising a bottom film arranged at a bottom end of the electrode assembly in the direction of gravity, the bottom film being provided with a flow guide groove on a side surface of the electrode assembly, the flow guide groove being used for accommodating the electrolyte, the insulating film comprising a side film connected to a periphery of the bottom film and arranged around the electrode assembly, the thickness of the bottom film being greater than the thickness of the side film of the insulating film, one surface of the bottom film in the thickness direction being attached to the electrode assembly, and the other surface of the bottom film in the thickness direction being attached to a bottom wall of the shell.

[0009] The effect of the embodiment is that, since the bottom film is provided with the flow guide groove capable of accommodating the electrolyte on the side surface facing the electrode assembly, the bottom end of the electrode assembly can be in full contact with the electrolyte, thereby improving the electrolyte infiltration effect of the electrode assembly, especially the bottom side of the electrode assembly. The thickness of the bottom film is set to a larger size, which can reduce the influence on the protection effect and the support effect of the electrode assembly. The bottom plate is removed, so that the thickness of the bottom film can be increased, thereby strengthening the protection and support effect of the bottom, and since the bottom plate is removed, the increased thickness of the bottom film will not have a great influence on the energy density compared to before.

[0010] In one embodiment of the first aspect, the end of the flow guide groove extends to the edge of the bottom film.

[0011] The embodiment provides a specific implementation form of the flow guide groove capable of entering the electrolyte, and the end of the flow guide groove extending to the edge of the bottom film can be connected with the inner surface of the side film, thereby receiving the electrolyte flowing down from the inner surface of the side film. This form has a simple design structure and is easy to process. Only the flow guide groove needs to be appropriately extended to achieve the effect, thereby simplifying the processing process.

[0012] In one embodiment of the first aspect, the thickness of the bottom film is 0.5-1.2 mm.

[0013] The embodiment provides a specific thickness of the bottom film, which can have a good insulation protection and support effect under this thickness.

[0014] In one embodiment of the first aspect, the flow guide groove does not penetrate the bottom film in the thickness direction of the bottom film. In this way, the influence on the insulation film protection effect can be reduced, and liquid leakage can be prevented.

[0015] In one embodiment of the first aspect, the flow guide groove comprises a first flow guide groove and a second flow guide groove, and the first flow guide groove and the second flow guide groove are arranged in cross and communication.

[0016] The effect of the embodiment is that the mutual communication effect of the electrolyte is strengthened, and the first flow guide groove and the second flow guide groove arranged in cross make the distribution of the electrolyte more dispersed and the contact with each part of the bottom of the electrode assembly more sufficient.

[0017] In one embodiment of the first aspect, the shape of the first flow guide groove and / or the second flow guide groove is one of a straight line, a curve, and an arc. The shape can be selectively set according to the needs.

[0018] In one embodiment of the first aspect, the first flow guide groove and the second flow guide groove are multiple, the multiple first flow guide grooves are arranged in sequence and spaced apart from each other along a first direction, and the multiple second flow guide grooves are arranged in sequence and spaced apart from each other along a second direction, the first direction and the second direction are not parallel to each other and are perpendicular to the thickness direction of the bottom film.

[0019] The effect of the embodiment is that the multiple first flow guide grooves and the multiple second flow guide grooves increase the liquid storage amount of the surface of the bottom film, and the first flow guide grooves and the second flow guide grooves can be combined in multiple-to-multiple communication, so that the integrity of the entire surface of the flow guide grooves is better. In addition, the multiple first flow guide grooves and the multiple second flow guide grooves are respectively arranged in sequence and spaced apart along different directions, so that the distribution is more uniform and the distribution of the electrolyte is more balanced.

[0020] In one embodiment of the first aspect, the flow guide groove is multiple, and the multiple flow guide grooves are parallel to each other and spaced apart from each other.

[0021] The effect of the embodiment is that the flow guide grooves do not intersect, but are multiple straight flow guide grooves parallel to each other, which is a simpler structure and does not have complicated processing procedures, and the distribution on the bottom film is also relatively uniform, so that the electrolyte is evenly distributed.

[0022] In one embodiment of the first aspect, the bottom film is further provided with a reinforcing rib.

[0023] The effect of the embodiment is that the reinforcing rib is provided, which greatly increases the structural strength of the bottom film and meets the support strength requirements of the electrode assembly.

[0024] In one embodiment of the first aspect, the reinforcing rib is arranged at the side surface of the bottom film facing the electrode assembly.

[0025] The effect of the embodiment is that the reinforcing rib is arranged at the side surface of the bottom film facing the electrode assembly, which can directly participate in the support of the electrode assembly, and strengthen the strength of the bottom film and the support stability of the electrode assembly.

[0026] In one embodiment of the first aspect, the reinforcing rib is embedded in the bottom film, the reinforcing rib is exposed at the side surface of the bottom film facing the electrode assembly, and the exposed part is flush with the side surface of the bottom film facing the electrode assembly.

[0027] The embodiment provides a form in which the reinforcing rib is embedded in the bottom film. When embedded, the reinforcing rib can be exposed from the side surface of the bottom film facing the electrode assembly, and the exposed part is flush with the surface, which strengthens the structural strength of the surface of the bottom film for supporting the electrode assembly. The two in flush state can jointly support the electrode assembly, and the support effect is good. Similarly in the embodiment, the reinforcing rib also cannot completely cover the flow guide groove to avoid affecting the flow of the electrolyte.

[0028] In one embodiment of the first aspect, the thickness of the reinforcing rib in the direction of gravity is less than the depth of the flow guide groove in the direction of gravity.

[0029] The effect of this embodiment is that when the reinforcing rib is embedded in the bottom film, the thickness of the reinforcing rib is less than the depth of the flow guide groove, so that the flow of electrolyte in the flow guide groove is not completely blocked.

[0030] In one embodiment of the first aspect, the reinforcing rib is multiple and arranged in cross.

[0031] The effect of this embodiment is that the overall effect and structural strength of the reinforcing rib are improved, which can effectively improve the strength of the bottom film and provide stable support for the electrode assembly.

[0032] In one embodiment of the first aspect, the intersection of the multiple reinforcing ribs is located at the center of the side surface of the bottom film facing the electrode assembly.

[0033] The effect of this embodiment is that the reinforcing rib can more evenly strengthen the bottom film.

[0034] In one embodiment of the first aspect, the depth of the flow guide groove is greater than or equal to 0.2 mm. This can accommodate sufficient electrolyte without significantly affecting the structural strength of the bottom film.

[0035] In one embodiment of the first aspect, the material of the insulating film is one of polypropylene, polyethylene, polyaryletherketone, polyimide, polysulfone, and polyethylene terephthalate.

[0036] The material of the insulating film provided in this embodiment has high corrosion resistance and insulation, as well as high chemical stability, and is not prone to reaction.

[0037] In one embodiment of the first aspect, the side surface of the bottom film facing the electrode assembly has a center point, the flow guide groove includes a first position and a second position, the first position is closer to the center point than the second position, and the groove depth of the first position is greater than that of the second position.

[0038] The effect of this embodiment is that the electrolyte can converge to the middle when in the flow guide groove, so that the middle position has more electrolyte, which can improve the electrolyte immersion effect of the middle position of the electrode assembly, and the electrolyte can be dispersed to the periphery, which can improve the overall immersion effect of the electrode assembly.

[0039] In a second aspect, the application further provides a battery device comprising the battery cell according to any one of the embodiments. The effect is that the safety and stability of the battery device are improved due to the good electrolyte infiltration effect of the electrode assembly of the battery cell.

[0040] In a third aspect, the application further provides a power consuming device comprising the battery cell according to any one of the embodiments or the battery device according to the above embodiments. The effect is that the reliability of the power consuming device is improved.

[0041] The above description is only a summary of the technical solutions of the application. In order to make the technical means of the application more clear, the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0043] Figure 1 Structure diagram of a vehicle according to some embodiments of the application;

[0044] Figure 2 Structure diagram of a battery device according to some embodiments of the application;

[0045] Figure 3 Structure diagram of a battery cell according to some embodiments of the application;

[0046] Figure 4 Structure diagram of a battery cell according to some embodiments of the application; Figure 3 Sectional view along A-A direction;

[0047] Figure 5 Structure diagram of an insulation film according to some embodiments of the application;

[0048] Figure 6 Structure diagram of an insulation film when opened according to some embodiments of the application;

[0049] Figure 7 Structure diagram of an insulation film when opened according to some embodiments of the application; Figure 6 Sectional view along A-A direction;

[0050] Figure 8 Structure diagram of an insulation film when opened according to some embodiments of the application;

[0051] Figure 9 Fig. 1 is a schematic view of a structure of a mold and a pressing plate according to an embodiment of the present application; Figure 8 Fig. 2 is a sectional view along B-B of Fig. 1;

[0052] Figure 10 Fig. 3 is a sectional view of a structure of a mold and a pressing plate according to another embodiment of the present application;

[0053] Figure 11 Fig. 4 is a schematic view of a structure of a mold and a pressing plate according to another embodiment of the present application; Figure 10 Fig. 5 is a schematic view of a structure of a mold and a pressing plate according to another embodiment of the present application;

[0054] Figure 12 Fig. 6 is a sectional view of a structure of a mold and a pressing plate according to another embodiment of the present application;

[0055] Figure 13 Fig. 7 is a schematic view of a structure of a mold and a pressing plate according to another embodiment of the present application; Figure 12 Fig. 8 is a schematic view of a structure of a mold and a pressing plate according to another embodiment of the present application.

[0056] Explanation of Reference Numerals:

[0057] 1000: vehicle

[0058] 100: battery device; 200: controller; 300: motor

[0059] 10: battery cell

[0060] 1: case; 2: insulating film; 21: bottom film; 22: side film; 3: flow guide groove; 31: first flow guide groove; 32: second flow guide groove; 4: reinforcing rib; 5: mold; 6: pressing plate; 61: convex stripe; 7: electrode assembly DETAILED DESCRIPTION

[0061] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0063] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0064] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0065] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which can represent three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0066] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0067] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0068] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0069] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and military and police equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0070] The battery device is a complete structural whole, including a box, a plurality of battery cells are arranged in the box, and in some special scenarios, a battery cell can also be arranged in the box. When the battery cells are multiple, the battery cells in the same row can form a battery cell assembly.

[0071] The battery device can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component. The mixed connection refers to a mixture of series and parallel connection.

[0072] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0073] As an example, the battery cell assembly can be a battery module, and the battery cell assembly is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery cell assembly can be formed by bundling a plurality of battery cells with a cable tie.

[0074] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0075] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0076] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0077] Embodiments of the present application provide a power consumption device with a battery device 100, i.e., a power consumption device using the battery device 100 as a power source.

[0078] The technical solutions described in the embodiments of the present application are applicable to various power consumption devices using the battery device 100, wherein the power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above power consumption devices.

[0079] The battery device 100 disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The electric device can use a power supply system provided with the battery device 100 disclosed in the present application, which is beneficial to improve the use reliability of the electric device.

[0080] The following embodiments are described by taking the electric device provided in the embodiments of the present application as a vehicle 1000 for convenience of description.

[0081] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided in some embodiments of the present application is shown in a structural schematic diagram. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, and can be a truck, a crane or a hoist, or can be a passenger car or a business car, and the vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom or the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0082] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0083] The battery device 100 can include a box body and a plurality of battery monomers 10 arranged in the box body. The battery monomer 10 is an energy storage component, and the battery monomer 10 can perform charging and discharging reactions. The battery monomer 10 includes an electrode assembly 7, and an insulating film 2 is wrapped around the outer periphery of the electrode assembly 7. The electrode assembly 7 is soaked in electrolyte to perform electrochemical reactions.

[0084] In the related art, the insulating film located at the outer periphery of the electrode assembly affects the soaking effect of the electrode assembly. In particular, the bottom side of the insulating film is attached to the electrode assembly under the action of gravity, and a bottom plate is further arranged at the lower side of the insulating film. The bottom plate is a structure inside the battery monomer and plays a supporting role. In this way, the insulating film is clamped between the electrode assembly and the bottom plate, so that it is difficult for the electrolyte to enter the electrode assembly at the bottom, thereby affecting the soaking effect of the electrode assembly.

[0085] Based on this, please refer to Figures 3-9The application provides a battery monomer 10, which comprises a shell 1, an electrode assembly 7, an electrolyte and an insulating film 2. The shell 1 has a cavity; the electrode assembly 7 is arranged in the cavity; the electrolyte is used for infiltrating the electrode assembly 7; and the insulating film 2 is wrapped around the electrode assembly 7. The insulating film 2 comprises a bottom film 21 arranged at the bottom end of the electrode assembly 7 along the gravity direction, and a flow guide groove 3 is arranged on the side surface of the bottom film 21, which is used for containing the electrolyte. The insulating film 2 comprises a side film 22 connected to the periphery of the bottom film 21 and arranged around the electrode assembly 7. The thickness of the bottom film 21 is greater than that of the side film 22 of the insulating film 2. One surface of the bottom film 21 along the thickness direction is attached to the electrode assembly 7, and the other surface of the bottom film 21 along the thickness direction is attached to the bottom wall of the shell 1.

[0086] The part of the insulating film 2 at the bottom end of the electrode assembly 7 along the gravity direction is the bottom film 21, and the flow guide groove 3 is used for containing the electrolyte, so the flow guide groove 3 can be communicated with the space in the shell 1 for containing the electrolyte.

[0087] Specifically, the electrode assembly 7 comprises a positive electrode sheet, a negative electrode sheet and a diaphragm separating the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the diaphragm and the negative electrode sheet can be wound to form a roll-shaped electrode assembly 7, or can be formed into a laminated electrode assembly 7. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector.

[0088] The shell 1 forms a cavity, and the electrode assembly 7 and the electrolyte are arranged in the cavity. The insulating film 2 wraps the electrode assembly 7, thereby achieving the effects of insulation and protection. The insulating film 2 covers the electrode assembly 7, and the shape of the insulating film 2 can be matched with the outer contour shape of the electrode assembly 7. Since the electrode assembly 7 is placed in the shell 1, the insulating film 2 is also arranged at the bottom of the electrode assembly 7. In this embodiment, the insulating film 2 at this position is the bottom film 21, which is a film body at the bottom end along the gravity direction. The bottom film 21 is in contact with the electrode assembly 7. In order to make the electrolyte flow to this position, the flow guide groove 3 is arranged on the surface of the bottom film 21 for supporting the electrode assembly 7. The flow guide groove 3 has a certain depth on the surface of the bottom film 21 and extends in a certain direction. The flow guide groove 3 can contain the electrolyte, thereby improving the electrolyte infiltration effect at the bottom of the electrode assembly 7. In order to make the electrolyte flow into the flow guide groove 3, the flow guide groove 3 can be communicated with the space in the shell 1 for containing the electrolyte.

[0089] The insulating film 2 wraps the electrode assembly 7, so the insulating film 2 comprises the side film 22 connected to the bottom film 21 in addition to the bottom film 21. The side film 22 can be understood as a film body arranged along the height direction of the electrode assembly 7.

[0090] Specifically, the bottom film 21 needs to be provided with the flow guide groove 3, so as to reduce the influence on the protection effect, and therefore the thickness of the bottom film 21 needs to be increased, and in order to reduce the influence on the energy density of the battery device 100, the bottom plate can also be removed, and the electrode assembly 7 is supported by the bottom film 21, and therefore the thickness of the bottom film 21 also needs to be appropriately increased, and at least the thickness of the bottom film 21 is greater than the thickness of the side film 22 of the insulating film 2.

[0091] In the embodiment, the bottom plate is removed in the related art, and one side surface of the bottom film 21 is attached to the electrode assembly 7, and the other side can be directly attached to the bottom of the shell 1.

[0092] The effect of the embodiment is that, since the side surface of the bottom film 21 facing the electrode assembly 7 is provided with the flow guide groove 3 capable of accommodating electrolyte, the bottom end of the electrode assembly 7 can be in full contact with the electrolyte, thereby improving the electrolyte infiltration effect of the electrode assembly 7, especially the bottom side of the electrode assembly 7. The thickness of the bottom film 21 is set to a large size, which can reduce the influence on the protection effect and the supporting effect of the electrode assembly 7. The bottom plate is removed, and the thickness of the bottom film 21 can be increased, thereby strengthening the protection and supporting effect of the bottom, and since the bottom plate is removed, the increased thickness of the bottom film 21 will not have a great influence on the energy density compared to before the removal.

[0093] In some embodiments, referring to Figures 6-9 , the end of the flow guide groove 3 extends to the edge of the bottom film 21.

[0094] The part connected with the bottom film 21 is the side film 22. The end of the flow guide groove 3 extends to the edge of the bottom film 21. Specifically, both ends of the flow guide groove 3 can extend to the edge of the bottom film 21, so that the end of the flow guide groove 3 is connected with the inner surface of the side film 22.

[0095] The electrode assembly 7 is infiltrated with electrolyte, and since there is no extrusion between the side film 22 and the electrode assembly 7 due to gravity, there is a space between the side film 22 and the electrode assembly 7 for accommodating electrolyte. The electrolyte can flow down along the inner wall of the side film 22, so when the end of the flow guide groove 3 extends to the inner surface of the side film 22 facing the electrode assembly 7, the electrolyte can flow to the flow guide groove 3.

[0096] The embodiment provides a specific implementation form of the flow guide groove 3 capable of entering the electrolyte. The end of the flow guide groove 3 extends to the edge of the bottom film 21, and can be connected with the inner surface of the side film 22, thereby receiving the electrolyte flowing down from the inner surface of the side film 22. This form has a simple design structure and is easy to process. Only the flow guide groove 3 needs to be appropriately extended, and the processing process is simplified.

[0097] In some embodiments, the thickness of the bottom film 21 is 0.5mm-1.2mm. The embodiment provides a specific thickness of the bottom film 21, which can achieve good insulation protection and supporting effect under this thickness.

[0098] In some embodiments, as Figure 7 and Figure 9 The flow guide groove 3 does not penetrate the bottom film 21 in the thickness direction of the bottom film 21, that is, the flow guide groove 3 is not permeable, so as to reduce the influence on the protection effect of the insulating film 2 and prevent liquid leakage.

[0099] In some embodiments, referring to Figure 6 The flow guide groove 3 can be distributed on the surface of the bottom film 21 and formed in a grid shape.

[0100] Specifically, the grid shape means that a plurality of flow guide grooves 3 are arranged to intersect each other and communicate with each other at the intersection points to form a grid shape. The grid shape provided in this embodiment refers to the shape formed by the distribution of a plurality of flow guide grooves 3 on the surface of the bottom film 21. The cross section of a single flow guide groove 3 can be rectangular, V-shaped, semicircular, etc.

[0101] The effect of this embodiment is to increase the distribution density of the flow guide groove 3 on the surface of the bottom film 21, improve the uniformity, and enable more electrolyte to flow into the surface of the bottom film 21, thereby increasing the wetting effect of the bottom electrode assembly 7.

[0102] In some embodiments, referring to Figure 6 and Figure 7 The flow guide groove 3 includes a first flow guide groove 31 and a second flow guide groove 32, and the first flow guide groove 31 and the second flow guide groove 32 are arranged to intersect and communicate with each other.

[0103] Specifically, the first flow guide groove 31 can be a plurality of, and the second flow guide groove 32 can also be a plurality of. The first flow guide groove 31 and the second flow guide groove 32 can be linear and extend along a certain direction. The two intersect and communicate with each other at the intersection position, thereby strengthening the intercommunication effect of the electrolyte. The intersected first flow guide groove 31 and second flow guide groove 32 make the distribution of the electrolyte more dispersed and the contact with the bottom of the electrode assembly 7 more sufficient.

[0104] In some embodiments, the shape of the first flow guide groove 31 and / or the second flow guide groove 32 is one of linear, curved, and arcuate.

[0105] Specifically, this embodiment provides selectable shapes of the first flow guide groove 31 and the second flow guide groove 32, which can be linear, curved, or arcuate, and can be selectively arranged as needed. The end position of the first flow guide groove 31 and the second flow guide groove 32 can be connected with the inner surface of the side film 22 of the insulating film 2, thereby receiving the electrolyte flowing down from the inner surface of the side film 22.

[0106] In some embodiments, referring to Figure 6 and Figure 7The first flow guide groove 31 and the second flow guide groove 32 are both multiple, the multiple first flow guide grooves 31 are arranged in sequence and spaced from each other along a first direction, and the multiple second flow guide grooves 32 are arranged in sequence and spaced from each other along a second direction, the first direction and the second direction are both perpendicular to the thickness direction of the bottom film 21.

[0107] Specifically, the multiple first flow guide grooves 31 and the multiple second flow guide grooves 32 increase the liquid storage amount of the surface of the bottom film 21, and the first flow guide grooves 31 and the second flow guide grooves 32 can be combined in multiple-to-multiple communication, so that the integrity of the entire surface of the flow guide groove 3 is better. In addition, the multiple first flow guide grooves 31 and the multiple second flow guide grooves 32 are arranged in sequence and spaced from each other along different directions respectively, so that the distribution is more uniform, and the distribution of the electrolyte is more balanced.

[0108] In some embodiments, referring to Figure 6 , the multiple first flow guide grooves 31 are parallel to each other, and the multiple second flow guide grooves 32 are parallel to each other.

[0109] Specifically, the first flow guide groove 31 and the second flow guide groove 32 are both linear, and the multiple first flow guide grooves 31 are parallel to each other, and the multiple second flow guide grooves 32 are parallel to each other, so that the arrangement form of the flow guide groove 3 on the bottom film 21 is more uniform, and the multiple first flow guide grooves 31 and the multiple second flow guide grooves 32 are both spaced, the first spacing between any two adjacent first flow guide grooves 31 can be the same, the second spacing between any two adjacent second flow guide grooves 32 can be the same, and the first spacing can also be equal to the second spacing. The effect of this is to further promote the uniformity of the arrangement of the flow guide groove 3 on the bottom film 21, so that the impregnation effect of the electrolyte on the electrode assembly 7 is better.

[0110] In some embodiments, referring to Figure 6 , the angle between the first direction and the second direction is 80-100 degrees.

[0111] Specifically, the first direction in which the multiple first flow guide grooves 31 are arranged and the second direction in which the multiple second flow guide grooves 32 are arranged are different directions, and both have a large included angle, so that the arrangement of the flow guide groove 3 on the bottom film 21 is more uniform, and the impregnation effect of the bottom film 21 on the electrode assembly 7 is more balanced.

[0112] The angle between the first direction and the second direction is 80-100 degrees, so that the directions of the two directions are different, which meets the requirement of uniformly distributing the flow guide groove 3 on the bottom film 21.

[0113] In some embodiments, referring to Figure 8 and Figure 9 , the flow guide groove 3 is multiple, and the multiple flow guide grooves 3 are parallel to each other and spaced from each other.

[0114] Specifically, the present embodiment provides that the flow guide grooves 3 are multiple, parallel and spaced from each other. Specifically, the flow guide grooves 3 can be linear, and the multiple flow guide grooves 3 extend in the same direction.

[0115] The effect of the present embodiment is that the flow guide grooves 3 are not crossed, but are multiple linear flow guide grooves 3 parallel to each other. This structure is simpler and the processing procedure is not complicated. At the same time, the distribution on the bottom film 21 is relatively uniform, so that the electrolyte is evenly distributed.

[0116] In some embodiments, the side surface of the bottom film 21 facing the electrode assembly 7 has an end corner area, and the end corner area can not be provided with the flow guide grooves 3.

[0117] Specifically, the shape of the bottom film 21 is adapted to the shape of the bottom surface of the electrode assembly 7, and specifically can be rectangular. The rectangular bottom film 21 has four end corners, which are the intersection positions of two edges. The end corners of the rectangle are right angles. The end corner area specifically refers to the end corner part of the bottom film 21. Since the shape of the bottom of the electrode assembly 7 is adapted to the shape of the bottom film 21, the end corners of the electrode assembly 7 correspond to the end corners of the bottom film 21, that is, the end corners of the bottom film 21 have the effect of supporting and balancing the electrode assembly 7. When the four end corners one by one support the electrode assembly 7, the electrode assembly 7 can have a good stability effect. Therefore, based on this, the present embodiment does not set the flow guide grooves 3 at the end corner positions to avoid affecting the stability of the electrode assembly 7.

[0118] In some embodiments, referring to Figures 6-9 , the bottom film 21 is further provided with a reinforcing rib 4.

[0119] In order to further increase the structural strength of the bottom film 21 and the stable supporting effect on the electrode assembly 7, the present embodiment provides that the reinforcing rib 4 is arranged on the bottom film 21. The reinforcing rib 4 can be made of a plastic material with a certain structural strength to increase the strength of the bottom film 21. In addition, the reinforcing rib 4 made of plastic material also has good insulation and chemical stability. The reinforcing rib 4 can be in a strip or sheet structure, specifically can be multiple, and can be arranged in an intersecting manner, or in a side-by-side manner, or in a grid shape. The shape characteristics of the bottom film 21 can be adapted and selected.

[0120] The effect of the present embodiment is that the reinforcing rib 4 greatly increases the structural strength of the bottom film 21, which meets the supporting strength requirement of the electrode assembly 7.

[0121] In some embodiments, referring to Figures 6-9 , the reinforcing rib 4 is arranged at the side surface of the bottom film 21 facing the electrode assembly 7.

[0122] Since the flow guide groove 3 is opened on the side surface of the bottom film 21 facing the electrode assembly 7, and the side surface is the surface for supporting the electrode assembly 7, the structural strength of the surface needs to be first strengthened, and the embodiment provides the reinforcing rib 4 located at the surface. Specifically, the reinforcing rib 4 can be connected with the surface, specifically, in the form of bonding, or in the form of being embedded in the surface, the top of the reinforcing rib 4 can be flush with the surface or can be higher than the surface, and the two ends of the reinforcing rib 4 in the length direction can be connected with the side film 22 of the insulating film 2. It should be noted that the reinforcing rib 4 can cover part of the flow guide groove 3, but cannot completely cover, or the reinforcing rib 4 can also be completely arranged in the part of the bottom film 21 which is not opened with the flow guide groove 3, and does not cover any flow guide groove 3, that is, the reinforcing rib 4 does not completely overlap the flow guide groove 3 in the gravity direction, which can avoid blocking the flow of the electrolyte.

[0123] The effect of the embodiment is that the reinforcing rib 4 is arranged on the side surface of the bottom film 21 facing the electrode assembly 7, which can directly participate in the support of the electrode assembly 7, and strengthen the strength of the bottom film 21 and the support stability of the electrode assembly 7.

[0124] In some embodiments, referring to Figures 6-9 the reinforcing rib 4 is embedded in the bottom film 21, and the exposed part of the reinforcing rib 4 is flush with the side surface of the bottom film 21 facing the electrode assembly 7.

[0125] The embodiment provides the form that the reinforcing rib 4 is embedded in the bottom film 21, when embedded, the reinforcing rib 4 can be exposed from the side surface of the bottom film 21 facing the electrode assembly 7, and the exposed part is flush with the surface, which strengthens the structural strength of the surface of the bottom film 21 for supporting the electrode assembly 7, and the two in flush state can jointly support the electrode assembly 7, and the support effect is good. Also in the embodiment, the reinforcing rib 4 cannot completely cover the flow guide groove 3 to avoid affecting the flow of the electrolyte.

[0126] In some embodiments, referring to Figures 6-9 the thickness of the reinforcing rib 4 in the gravity direction is less than the depth of the flow guide groove 3 in the gravity direction.

[0127] Specifically, when the reinforcing rib 4 is arranged in the embedded form in the bottom film 21, if part of the flow guide groove 3 is covered, the thickness needs to be less than the depth of the flow guide groove 3, which avoids that the reinforcing rib 4 completely blocks the flow of the electrolyte in the flow guide groove 3.

[0128] In some embodiments, referring to Figures 6-9 the reinforcing rib 4 is multiple and arranged in cross.

[0129] Specifically, the plurality of reinforcing ribs 4 can extend in one direction in one portion and extend in another direction in another portion, and the two portions can intersect each other one by one to form a grid shape, or the plurality of reinforcing ribs 4 can intersect each other at a middle position to form a shape similar to a rice character, or the reinforcing ribs 4 can also be circular rings, and the plurality of circular rings can intersect each other.

[0130] The effect of the embodiment is that the integrity effect and structural strength of the reinforcing ribs 4 are improved, and the strength of the bottom film 21 can be effectively improved to stably support the electrode assembly 7.

[0131] In some embodiments, referring to Figures 6-9 , the intersection points of the plurality of reinforcing ribs 4 are located at the center position of the side surface of the bottom film 21 facing the electrode assembly 7.

[0132] When the plurality of reinforcing ribs 4 are arranged to intersect each other, such as intersecting each other in a rice character shape, the intersection points can be located at the center position of the bottom film 21. When the bottom film 21 is rectangular, the center position refers to the intersection of the two diagonal lines, and when the bottom film 21 is circular, the center position refers to the center of the circle.

[0133] The effect of the embodiment is that the reinforcing effect of the reinforcing ribs 4 on the bottom film 21 is more balanced.

[0134] In some embodiments, the depth of the flow guide groove 3 is greater than or equal to 0.2 mm.

[0135] The embodiment provides the depth of the flow guide groove 3, which refers to the vertical distance from the lowest point of the flow guide groove 3 in the direction of gravity to the surface of the bottom film 21. The depth of the flow guide groove 3 in the embodiment is greater than or equal to 0.2 mm, which can accommodate sufficient electrolyte and also not greatly affect the structural strength of the bottom film 21.

[0136] In some embodiments, the material of the insulating film 2 is one of polypropylene, polyethylene, polyaryletherketone, polyimide, polysulfone, and polyethylene terephthalate.

[0137] The material of the insulating film 2 provided in the embodiment has high corrosion resistance and insulation, as well as high chemical stability, and is not prone to reaction.

[0138] In some embodiments, the side surface of the bottom film 21 facing the electrode assembly 7 has a center point, the flow guide groove 3 includes a first position and a second position, the first position is closer to the center point than the second position, and the groove depth of the first position is greater than the groove depth of the second position.

[0139] Specifically, when the bottom film 21 is rectangular, the center point is the intersection of the diagonal lines of the rectangular face, and when the bottom film 21 is circular, the center point is the center of the circle. The flow guide groove 3 is formed on the surface of the bottom film 21 and extends in a certain direction, which can be linear, curved, or a broken line. The distance from the different positions of the flow guide groove 3 to the center point is different. The groove depth of the first position close to the center point is greater than the groove depth of the second position far from the center point. In this way, the electrolyte in the flow guide groove 3 can converge to the middle, so that the middle position has more electrolyte, which can enhance the electrolyte infiltration effect of the middle position of the bottom of the electrode assembly 7. At the same time, the electrolyte is dispersed to the four corners, which can improve the overall infiltration effect of the electrode assembly 7.

[0140] The application also provides an embodiment of a membrane preparation device for preparing the insulating film 2 of any embodiment. The preparation of the insulating film 2 can be realized by the device.

[0141] In some embodiments, as Figure 10 and Figure 11 , the membrane preparation device comprises a mold 5, a pressing plate 6, and a driving mechanism.

[0142] The mold 5 is provided with a mold cavity for accommodating the hot-melt raw material for forming the insulating film 2. The mold 5 is also provided with an open port communicating with the mold cavity. The pressing plate 6 is adapted to the contour shape of the open port and is aligned with the open port. The power output end of the driving mechanism is connected to the pressing plate 6 to drive the pressing plate 6 to enter the mold cavity through the open port. The pressing plate 6 cooperates with the inner wall of the mold 5 to form a raw material shaping space. The membrane refers to the insulating film 2 in the above embodiments.

[0143] Specifically, the mold 5 has a mold cavity. The raw material in a hot-melt state is injected into the mold cavity. Before the raw material cools, the pressing plate 6 is inserted into the mold cavity. The pressing plate 6 and the mold 5 cooperate to form a raw material shaping space. The shape of this space can be the same as the shape of the insulating film 2 after unfolding. The pressing plate 6 extrudes the raw material into a shape that is adapted to the raw material shaping space by pressing the raw material. After cooling, the above-mentioned insulating film 2 can be obtained.

[0144] The effect of the embodiment is that the device is convenient to prepare, simple in structure, easy to operate, can speed up the preparation efficiency, and improve the production speed.

[0145] In some embodiments, as Figure 12 and Figure 13 , the surface of the pressing plate 6 facing the mold 5 is also provided with a convex strip 61. The convex strip 61 is extruded into the raw material to form the flow guide groove 3.

[0146] Specifically, in order to facilitate the formation of the flow guide groove 3, when the pressing plate 6 extrudes the raw material, the convex strip 61 extends into the raw material, and after the raw material cools, the pressing plate 6 is removed, and the place where the convex strip 61 is located forms the flow guide groove 3, thereby obtaining the insulating film 2.

[0147] The effect of the embodiment is that the convex strip 61 forming the flow guide groove 3 is arranged on the pressing plate 6, and the flow guide groove 3 is formed at the same time of forming the insulating film 2, further reducing the preparation process and improving the production efficiency.

[0148] In some embodiments, the flow guide groove 3 can also be etched on the raw material in the form of laser etching after the raw material cools. That is, the embodiment also uses the mold 5 and the pressing plate 6 to prepare the insulating film 2, but the difference is that the convex strip 61 is not arranged on the pressing plate 6, but after the raw material cools, the pressing plate 6 is opened, and a laser etching device is used to form the flow guide groove 3 on the raw material in the form of laser etching, thereby obtaining the insulating film 2. The flow guide groove 3 is prepared in the form of laser etching, which is more flexible, and various structures of the flow guide groove 3 can be prepared according to needs, and the selectivity is better.

[0149] As Figure 2 The application also provides a battery device 100 comprising the battery monomer 10 provided by any one of the embodiments. The effect is that the electrolyte infiltration effect of the electrode assembly 7 of the battery monomer 10 is good, so the safety and stability of the battery device 100 are increased.

[0150] As Figure 1 The application also provides a power consumption device comprising the battery monomer 10 provided by any one of the embodiments or the battery device 100 of the above embodiments. The effect of the embodiment is to increase the reliability of the power consumption device.

[0151] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the description of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a cavity; an electrode assembly disposed in the cavity; an electrolyte for impregnating the electrode assembly; and an insulation film wrapped around the electrode assembly, the insulation film comprising a bottom film disposed at a bottom end of the electrode assembly along a gravity direction, the bottom film having a flow guide groove opened on a side surface of the bottom film facing the electrode assembly, the flow guide groove being used for accommodating the electrolyte, the insulation film comprising a side film connected to a periphery of the bottom film and arranged around the electrode assembly, a thickness of the bottom film being greater than a thickness of the side film of the insulation film, one surface of the bottom film along a thickness direction being attached to the electrode assembly, and another surface of the bottom film along the thickness direction being attached to a bottom wall of the housing.

2. The battery cell of claim 1, wherein, An end of the flow guide groove extends to an edge of the bottom film.

3. The battery cell of claim 2, wherein, The thickness of the bottom film is 0.5-1.2 mm.

4. The battery cell of claim 1, wherein, The flow guide groove does not penetrate the bottom film in the thickness direction of the bottom film.

5. The battery cell of any one of claims 1-4, wherein, The flow guide groove comprises a first flow guide groove and a second flow guide groove, the first flow guide groove and the second flow guide groove being arranged in cross and communication.

6. The battery cell of claim 5, wherein, The first flow guide groove and / or the second flow guide groove has one of a linear shape, a curved shape, and an arcuate shape.

7. The battery cell of claim 5, wherein the cathode comprises a lithium metal oxide. The first flow guide groove and the second flow guide groove are both a plurality of flow guide grooves, the plurality of first flow guide grooves being arranged in sequence and spaced apart from each other along a first direction, and the plurality of second flow guide grooves being arranged in sequence and spaced apart from each other along a second direction, the first direction and the second direction being non-parallel to each other and both perpendicular to the thickness direction of the bottom film.

8. The battery cell of any one of claims 1-4, wherein, The flow guide groove is a plurality of flow guide grooves, the plurality of flow guide grooves being parallel to each other and spaced apart from each other.

9. The battery cell of any one of claims 1-4, wherein, The bottom film is further provided with a reinforcing rib.

10. The battery cell of claim 9, wherein, The reinforcing rib is disposed at a side surface of the bottom film facing the electrode assembly.

11. The battery cell as described in claim 9, characterized in that, The reinforcing rib is embedded in the bottom film, the reinforcing rib being exposed on the side surface of the bottom film facing the electrode assembly and the exposed part being flush with the side surface of the bottom film facing the electrode assembly.

12. The battery cell of claim 11, wherein, A thickness of the reinforcing rib in the gravity direction is less than a depth of the flow guide groove in the gravity direction.

13. The battery cell as described in claim 10, characterized in that, The reinforcing rib is a plurality of reinforcing ribs and arranged in cross.

14. The battery cell as described in claim 13, characterized in that, Crossing points of the plurality of reinforcing ribs are located at a central position of the side surface of the bottom film facing the electrode assembly.

15. The battery cell according to any one of claims 1-4, characterized in that, The depth of the flow guide groove is greater than or equal to 0.2 mm.

16. The battery cell of any one of claims 1-4, wherein, A material of the insulation film is one of polypropylene, polyethylene, polyaryletherketone, polyimide, polysulfone, and polyethylene terephthalate.

17. The battery cell of any one of claims 1-4, wherein, The side surface of the bottom film facing the electrode assembly has a center point, the flow guide groove comprises a first position and a second position, the first position being closer to the center point than the second position, and a groove depth of the first position being greater than a groove depth of the second position.

18. A battery device characterized by comprising: The battery cell of any one of claims 1-17.

19. An electrical device, comprising: The battery cell of any one of claims 1-17 or the battery device of claim 18.

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