CN221126077U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The utility model discloses a battery monomer, a battery and electric equipment, wherein the battery monomer comprises a shell component and an electrode component, the shell component comprises a top cover and a shell, a containing cavity with an opening formed at a first end is formed in the shell, the top cover is fixed with the shell to close the opening, the electrode component is arranged in the containing cavity, and the electrode component is arranged in an insulating way with the shell; wherein, the casing includes body layer and isolation layer, and the isolation layer sets up on the surface of body layer, in the direction of height of shell subassembly, the isolation layer is close to the first edge and the first end interval setting of first end. So, the isolation layer sets up the surface at the body layer, and the isolation layer can keep apart the casing of battery monomer and battery, or keeps apart electrolyte and body layer, can reduce like this and form high voltage and lead to the risk of electrolyte decomposition between the casing of battery monomer and battery, or the casing of battery is corroded by the risk of electrolyte to the life-span of using the free battery of battery is prolonged.

Description

Battery monomer, battery and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

In recent years, with the development of battery technology, batteries are widely used in energy storage power supply systems such as hydraulic power, thermal power, wind power and solar power stations, and in various fields such as electric tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and the like. In the related art, the battery includes a plurality of battery cells arranged in series or in parallel to provide the battery with a larger capacity. In the battery cell, the electrolyte is taken as an important component, and how to improve the effectiveness of the electrolyte in the use process of the battery so as to prolong the service life of the battery is a technical problem to be solved.

Disclosure of utility model

In view of the above problems, the present utility model provides a battery cell, a battery and an electric device, which can reduce and improve the effectiveness of an electrolyte in the use process of the battery to prolong the service life of the battery.

In a first aspect, the present utility model provides a battery cell, the battery cell including a case assembly including a top cover and a case, the case having a receiving cavity therein forming an opening at a first end, the top cover being fixed with the case to close the opening, and an electrode assembly disposed in the receiving cavity, the electrode assembly being disposed in insulation with the case; the shell comprises a body layer and an isolation layer, wherein the isolation layer is arranged on the surface of the body layer, and is arranged close to the first edge of the first end and spaced from the first end in the height direction of the shell assembly.

In the battery monomer of the embodiment of the utility model, the shell of the battery monomer is arranged as the body layer and the isolation layer, the isolation layer is arranged on the surface of the body layer, and the isolation layer can isolate the battery monomer from the shell of the battery or isolate the electrolyte from the body layer, so that the risk of electrolyte decomposition caused by high voltage formed between the battery monomer and the shell of the battery or the risk of corrosion of the shell of the battery by the electrolyte can be reduced, and the service life of the battery applying the battery monomer is prolonged. In addition, the isolation layer is close to the first edge of the first end of casing and the first end interval setting of casing, can reduce the interference when the isolation layer is connected to top cap and body layer like this for body layer and top cap are connected more firmly.

In some embodiments, the isolation layer is disposed on a side of the body layer adjacent to the receiving cavity; and/or the isolation layer is arranged on one side of the body layer, which faces away from the accommodating cavity. Therefore, when the isolating layer is arranged on one side of the body layer close to the accommodating cavity, the isolating layer can reduce the contact area of the electrolyte and the body layer, and the corrosion probability of the body layer is reduced; when the isolation layer is arranged on one side of the body layer deviating from the accommodating cavity, the isolation layer not only can isolate the shell of the battery cell and the shell of the battery, but also can reduce the risk of electrolyte decomposition caused by high voltage formed between the battery cell and the shell of the battery, and can also reduce the probability of mutual contact of the body layers of two adjacent battery cells, thereby reducing the risk of high voltage breakdown of the shell of the battery cell caused by the formation of a higher voltage between the two adjacent battery cells caused by short circuit between the two adjacent battery cells, and further causing the generation of liquid leakage, temperature rise or thermal runaway of the battery cell.

In certain embodiments, the spacer layer has a thickness of 3 μm to 50 μm. Therefore, the isolation layer not only has better insulating property, but also reduces the preparation cost of the isolation layer.

In certain embodiments, the spacer layer has a thickness of 6 μm to 30 μm.

In certain embodiments, the barrier layer is an aluminum oxide film or a polyimide film. Therefore, the insulating property of the isolating layer is good and the isolating layer is easy to prepare, so that the preparation cost of the battery monomer is low.

In certain embodiments, the distance between the first edge and the first end is h, h being greater than or equal to t-0.5mm, where t is the thickness of the cap in mm. Thus, the isolation layer can effectively reduce interference when the top cover is connected with the body layer.

In certain embodiments, the distance between the first edge and the first end is h,1 mm.ltoreq.h.ltoreq.10 mm. Thus, the isolation layer can not only reduce interference when the top cover is connected with the body layer, but also effectively realize the insulation effect on the electrode assembly.

In some embodiments, the electrode assembly includes an electrode body and a tab connected to the electrode body, and the first edge of the separator layer is closer to the first end of the case than the top of the electrode body in a height direction of the case assembly. So, in the direction of height of shell subassembly, the first edge of isolation layer compares the top of electrode body and is close to the first end of casing more to make the isolation layer completely surround the electrode body, the isolation layer is higher than the liquid level of electrolyte, separates electrolyte and body layer effectively, reduces the risk that the body layer is corroded.

In a second aspect, the present utility model provides a battery comprising a battery cell according to any one of the embodiments described above.

In a third aspect, the present utility model provides an electrical device, which includes a battery cell or a battery in any of the above embodiments.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the utility model;

Fig. 2 is a schematic view of a battery according to some embodiments of the present utility model;

FIG. 3 is an exploded view of a battery cell according to some embodiments of the present utility model;

FIG. 4 is a schematic cross-sectional view of a battery cell according to some embodiments of the utility model;

FIG. 5 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the utility model;

FIG. 6 is another schematic partial cross-sectional view of a battery cell according to some embodiments of the utility model;

FIG. 7 is a schematic view in partial cross-section of a battery cell according to some embodiments of the utility model;

fig. 8 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the utility model.

Reference numerals illustrate: 1000-consumer, 200-battery, 300-controller, 400-motor, 210-case, 211-first portion, 212-second portion, 100-battery cell, 110-housing assembly, 111-housing, 101-opening, 102-receiving cavity, 10-body layer, 11-inner surface, 12-outer surface, 13-first wall, 14-second wall, 120-electrode assembly, 21-electrode body, 22-tab, 30-separator, 31-first edge, 112-top cap.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

Unless defined otherwise, 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 utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present utility model, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by 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", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

Currently, the more widely the battery is used in view of the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.

Reference to a battery in accordance with an embodiment of the present utility model refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present utility model may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery may include a plurality of battery cells arranged in series or in parallel. The battery monomer comprises a shell, an electrode assembly and electrolyte, wherein the electrode assembly consists of an anode plate, a cathode plate and a diaphragm. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work.

The development of battery technology is taking into consideration various design factors such as energy density, discharge capacity, charge-discharge rate and other performance parameters, and the safety of batteries.

In the related art, in a battery, there is a potential difference, that is, a voltage, between a positive electrode and a negative electrode. When a plurality of battery cells are connected in series to form a battery, the voltages of the battery cells are superimposed, thereby forming a higher total voltage.

When a cell in a battery is in contact with the casing of the battery, since the casing of the battery generally serves as the casing and the negative electrode of the battery, and the cell is the positive electrode, a voltage difference between the positive and negative electrodes may generate a high voltage on the casing of the battery. Such high voltages may cause electrolytic reactions between the casing of the battery and the electrolyte, thereby causing safety problems or battery failure, reducing the life of the battery.

In addition, when the electrolyte contacts with the housing of the battery cell, the electrolyte easily corrodes the housing of the battery cell, resulting in a risk of leakage of the housing. In summary, decomposition of the electrolyte or leakage of the electrolyte becomes one of the key factors affecting the life of the battery.

In order to solve the problem of electrolyte decomposition or leakage of electrohydraulic liquid, the shell of the battery is arranged to be a body layer and an isolation layer, the isolation layer is arranged on the surface of the body layer, the isolation layer can isolate the battery cell from the shell of the battery, or isolate the electrolyte from the body layer, so that the risk of electrolyte decomposition caused by high voltage formed between the battery cell and the shell of the battery can be reduced, or the risk of corrosion of the shell of the battery cell by the electrolyte can be reduced, and the service life of the battery using the battery cell can be prolonged.

The electric equipment comprises a battery cell or a battery in any one of the following embodiments. Specifically, the electric equipment can use a battery or a battery monomer as a power supply, and the electric equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take the electric device 1000 according to the embodiment of the present utility model as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric device 1000 according to some embodiments of the utility model. The battery 200 is provided in the interior of the vehicle, and the battery 200 may be provided at the bottom or the head or the tail of the vehicle. The battery 200 may be used for power supply of a vehicle, for example, the battery 200 may be used as an operating power source of the vehicle.

The vehicle may also include a controller 300 and a motor 400, the controller 300 being configured to control the battery 200 to power the motor 400, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

In an embodiment of the present utility model, the battery 200 may be used not only as an operating power source of a vehicle but also as a driving power source of the vehicle to supply driving power to the vehicle instead of or in part of fuel oil or natural gas.

In some embodiments, battery 200 may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 200 according to some embodiments of the utility model. The battery 200 according to the embodiment of the present utility model includes the battery cell 100 according to any one of the following embodiments. In this manner, since the electrode assembly can be effectively impregnated in the battery cell 100 and the function of the separator is not greatly affected, the battery 200 of the embodiment of the present utility model has superior performance and can continuously and stably operate in a safe environment.

In the embodiment of the present utility model, the battery cell 100 may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present utility model. The battery cell 100 may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, etc., which are not limited thereto according to the embodiment of the present utility model. The battery cells 100 are generally divided into three types in a package manner: the cylindrical battery cell, the prismatic battery cell, and the pouch battery cell, to which the embodiment of the present utility model is not limited.

The battery 200 generally includes a housing 210 for enclosing one or more battery cells 100. The plurality of battery cells 100 may be accommodated in the case 210, and the case 210 may prevent the liquid or other foreign matters from affecting the charge or discharge of the battery cells 100. The case 210 serves as a supporting body of the battery module, and plays a key role in safety work and protection of the battery module. The case 210 is required to meet the strength and rigidity requirements and the protection level requirements of the body layer of the electrical equipment while providing collision protection. The box 210 can be cast by steel plates, aluminum alloys and other materials; novel lightweight materials, such as glass fiber reinforced composites, carbon fiber reinforced composites, and the like, may also be used.

In some embodiments, the case 210 may include a first portion 211 and a second portion 212, the first portion 211 and the second portion 212 being overlapped with each other, the first portion 211 and the second portion 212 together defining an accommodating space for accommodating the battery cell 100. The second portion 212 may be a hollow structure with one end opened, the first portion 211 may be a plate-shaped structure, and the first portion 211 covers the opening side of the second portion 212, so that the first portion 211 and the second portion 212 together define an accommodating space; the first portion 211 and the second portion 212 may be hollow structures with one side open, and the open side of the first portion 211 is covered with the open side of the second portion 212. Of course, the case 210 formed by the first portion 211 and the second portion 212 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

Referring to fig. 3 and 4, fig. 3 is an exploded view of a battery cell 100 according to some embodiments of the utility model. Fig. 4 is a schematic cross-sectional view of a battery cell according to some embodiments of the utility model. In some embodiments, the battery cell 100 includes a case assembly 110 and an electrode assembly 120, the case assembly 110 includes a case 111 and a top cover 112, the case 111 has a receiving cavity 102 inside which an opening 101 is formed at a first end, the top cover 112 is fixed with the case 111 to close the opening 101, the electrode assembly 120 is disposed in the receiving cavity 102, and the electrode assembly 120 is disposed insulated from the case 111; the case 111 includes a body layer 10 and a separation layer 30, and the separation layer 30 is disposed on a surface of the body layer 10.

Specifically, the opening 101 of the body layer 10 is located at an end of the body layer 10, and the opening 101 allows the electrode assembly 120 to be easily assembled within the body layer 10. The top cap 112 is hermetically connected with the body layer 10 and closes the opening 101, so that a closed space is formed inside the battery cell 100, and the risk of leakage of electrolyte is effectively reduced.

The body layer 10 may be in the shape of a cylinder, a cuboid, a flat body, etc. The body layer 10 may be made of steel, aluminum, or the like. The isolation layer 30 is a film material with insulating properties, and the isolation layer 30 may cover the surface of the body layer 10 completely, or may cover a part of the surface of the body layer 10.

In the battery cell 100 according to the embodiment of the utility model, the case 111 of the battery cell 100 is provided with the body layer 10 and the isolation layer 30, and the isolation layer 30 is provided on the surface of the body layer 10, so that the isolation layer 30 can isolate the battery cell 100 from the case of the battery 200 or isolate the electrolyte from the body layer 10, and thus the risk of decomposition of the electrolyte due to formation of high voltage between the battery cell 100 and the case of the battery 200 or the risk of corrosion of the case 111 of the battery cell 100 by the electrolyte can be reduced, thereby prolonging the life of the battery 200 to which the battery cell 100 is applied.

In some embodiments, the separator layer 30 may be an equal thickness film or a different thickness film.

In some embodiments, the barrier layer 30 is disposed on a side of the body layer 10 adjacent to the receiving cavity 102; and/or the isolating layer 30 is arranged on the side of the body layer 10 facing away from the receiving cavity 102. Alternatively, the inner surface 11 and/or the outer surface 12 of the body layer 10 are provided with a separation layer 30, as shown in fig. 5, the separation layer 30 is provided on the side of the body layer 10 close to the receiving cavity 102, or the inner surface 11 of the body layer 10 is provided with the separation layer 30; as shown in fig. 6, the insulating layer 30 is provided on the side of the body layer 10 facing away from the receiving chamber 102, or the outer surface 12 of the body layer 10 is provided with the insulating layer 30; as shown in fig. 7, the insulation layer 30 is disposed on a side of the body layer 10 adjacent to and away from the receiving cavity 102, or, alternatively, both the inner surface 11 and the outer surface 12 of the body layer 10 are provided with the insulation layer 30.

The outer surface 12 of the body layer 10 refers to the surface facing the interior of the body layer 10, and the outer surface 12 of the body layer 10 refers to the surface facing the exterior of the body layer 10. The inner surface 11 and the outer surface 12 of the body layer 10 may be one plane, one curved surface, or include a plurality of planes, a plurality of curved surfaces, and a combination of planes and curved surfaces.

Thus, when the separation layer 30 is disposed on the side of the body layer 10 near the accommodating chamber 102, the separation layer 30 can reduce the contact area between the electrolyte and the body layer 10, and reduce the corrosion probability of the body layer 10 by the electrolyte.

When the isolation layer 30 is disposed on one side of the body layer 10 away from the accommodating cavity 102, the isolation layer 30 not only can isolate the battery cell 100 from the housing of the battery 200, reduce the risk of electrolyte decomposition caused by high voltage formed between the battery cell 100 and the housing of the battery 200, but also can reduce the probability of mutual contact of the body layers 10 of two adjacent battery cells 100, thereby reducing the risk of liquid leakage, temperature rise or thermal runaway generated by the battery cell 100 due to higher voltage formed between the two battery cells 100 caused by short circuit between the two adjacent battery cells 100.

It should be noted that the high voltage referred to in the embodiments of the present utility model is a voltage greater than 100V.

Referring to fig. 3 and 5, in some embodiments, the body layer 10 includes a first wall 13 and a second wall 14 connected to the first wall 13, the first wall 13 having an area larger than that of the second wall 14, the inner surfaces of the first wall 13 and the second wall 14 each being provided with a barrier layer 30, and/or the outer surfaces of the first wall 13 and the second wall 14 each being provided with a barrier layer 30.

For example, the inner surface of the first wall 13 and the inner surface of the second wall 14 are each provided with an isolating layer 30; as another example, both the outer surface of the first wall 13 and the outer surface of the second wall 14 are provided with an isolating layer 30; for another example, the inner and outer surfaces of the first wall 13 and the inner and outer surfaces of the second wall 14 are provided with the insulation layer 30. The area of the first wall 13 is larger than the area of the second wall 14, and thus, the surface of the first wall 13 of the body layer 10 may be referred to as a large surface, and the surface of the second wall 14 may be referred to as a small surface.

Referring to fig. 6, in some embodiments, the spacer layer 30 has a thickness H of 3 μm to 50 μm. For example, H may be 3 μm, 10 μm, 18 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc., so that when the thickness H of the separator 30 is in the above range, the separator 30 may have a good insulating property, and the manufacturing cost of the separator 30 may be reduced. When the thickness of the separator 30 is less than 3 μm, the insulating property of the separator 30 is poor, and it is difficult to satisfy the insulation requirements of the battery cell 100. When the thickness of the separation layer 30 is greater than 50 μm, the performance of the separation layer 30 is excessive, and the preparation time of the separation layer 30 is long, so that the preparation cost of the separation layer 30 is high.

In certain embodiments, the thickness H of the spacer layer 30 is 6 μm to 30 μm. For example, H may be 6 μm, 10 μm, 15 μm, 20 μm, 22 μm, 25 μm, 30 μm, etc.

In certain embodiments, the barrier layer 30 is an aluminum oxide film or a polyimide film. Specifically, the body layer 10 may be an aluminum alloy shell, and the aluminum oxide film may be formed through an anodic oxidation process. For example, the body layer 10 may be subjected to an electrochemical reaction as an anode, that is, the surface of the body layer 10 may be subjected to an oxidation reaction, and the reaction product is alumina powder, and the alumina powder is bonded to the surface of the body layer 10 to form a film, that is, an alumina film attached to the surface of the body layer 10 may be obtained. It should be noted that the alumina film has good insulation performance, so that it can provide better insulation protection for the body layer 10. A Polyimide (PI) film may be formed on the surface of the body layer 10 by a process of spraying, electrophoresis, or the like. In this manner, the aluminum oxide film or the polyimide film is used to make the insulation performance of the separator 30 better and is easily manufactured, so that the manufacturing cost of the battery cell 100 is low.

Referring to fig. 3, 4 and 8, in some embodiments, the isolation layer 30 is spaced apart from the first end of the housing 111 in the height direction of the housing assembly 110 near the first edge 31 of the first end of the housing 111.

In general, the top cover 112 and the body layer 10 may be connected by a welding process. When the top cover 112 is welded with the body layer 10, a molten pool is formed at the welding position of the top cover 112 and the body layer 10, so that the top cover 112 is firmly connected with the body layer 10. The first edge 31 of the isolation layer 30 near the first end of the housing 111 is spaced from the first end of the housing 111, that is, the isolation layer 30 is not disposed near the opening 101, so that a molten pool is more easily formed between the top cover 112 and the body layer 10 during welding, and defects such as cold joint formed between the top cover 112 and the body layer 10 during welding are reduced.

Therefore, the first edge 31 of the isolation layer 30 near the first end of the housing 111 is spaced from the first end of the housing 111, so that interference of the isolation layer 30 to the connection of the top cover 112 and the body layer 10 can be reduced, and the body layer 10 and the top cover 112 can be more firmly connected.

Referring to FIG. 8, in some embodiments, the distance between the first edge 31 of the barrier layer 30 near the first end of the housing 111 and the first end of the housing 111 is h.gtoreq.t-0.5 mm, where t is the thickness of the top cover 112 in mm. In one example, the thickness t of the top cover 112 is 1.5mm, where h is greater than or equal to 1mm, or the distance between the barrier layer 30 adjacent to the opening 101 and the opening 101 is greater than or equal to 1mm. For example, h may be 1mm, 3mm, 4mm, 5mm, 10mm, etc. in size. In this way, the isolation layer 30 makes the welding pool formed between the top cover 112 and the body layer 10 easier in the welding process, so that interference between the top cover 112 and the body layer 10 can be effectively reduced, and the connection firmness between the top cover 112 and the body layer 10 is improved.

Referring to FIG. 8, in some embodiments, the distance between the first edge 31 of the barrier layer 30 proximate the first end of the housing 111 and the first end of the housing 111 is h,1 mm.ltoreq.h.ltoreq.10 mm. For example, h may be 1mm, 3mm, 4mm, 5mm, 10mm, etc. in size. In this manner, the spacer layer 30 not only reduces interference when the top cover 112 is coupled to the body layer 10.

Of course, in the embodiment of fig. 5-7, the isolation layer 30 may also extend to the opening 101.

Referring to fig. 3 and 5-8, in some embodiments, the electrode assembly 120 includes an electrode body 21 and a tab 22 connected to the electrode body 21, and the first edge 31 of the separation layer 30 is closer to the first end of the case 111 than the top of the electrode body 21 in the height direction of the case assembly 110. Specifically, the electrode body 21 is a main component of the electrode assembly 120, and the electrode body 21 has an active material, which may be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, carbon or silicon, or the like. The tab 22 is not coated with an active material. The volume of the electrode body 21 is much larger than the volume of the tab 22. During use of the battery cell 100, the electrode body 21 is impregnated with the electrolyte. Therefore, in the height direction of the case assembly 110, the first edge 31 of the separation layer 30 is closer to the first end of the case 111 than the top of the electrode body 21, so that the separation layer 30 completely surrounds the electrode body 21, and the separation layer 30 is higher than the liquid level of the electrolyte, thereby effectively isolating the electrolyte from the body layer 10 and reducing the risk of corrosion of the body layer 10.

In some embodiments, the first edge 31 of the barrier layer 30 proximate the first end of the housing 111 is disposed equidistant from the first end of the housing 111, thereby making the barrier layer 30 easier to dispose.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery cell, comprising:

A housing assembly including a top cover and a shell, the shell having a receiving cavity therein forming an opening at a first end, the top cover being secured with the shell to close the opening;

An electrode assembly disposed within the receiving cavity, the electrode assembly being disposed insulated from the housing;

The shell comprises a body layer and an isolation layer, wherein the isolation layer is arranged on the surface of the body layer, and is arranged close to the first edge of the first end and spaced from the first end in the height direction of the shell assembly.

2. The battery cell of claim 1, wherein the separator layer is disposed on a side of the body layer adjacent to the receiving cavity; and/or the isolation layer is arranged on one side of the body layer, which faces away from the accommodating cavity.

3. The battery cell of claim 1, wherein the separator has a thickness of 3 μιη to 50 μιη.

4. The battery cell of claim 3, wherein the separator has a thickness of 6 μm to 30 μm.

5. The battery cell of claim 1, wherein the separator is an aluminum oxide film or a polyimide film.

6. The battery cell of claim 1, wherein the distance between the first edge and the first end is h, h is greater than or equal to t-0.5mm, wherein t is the thickness of the top cap in mm.

7. The battery cell of claim 1, wherein the distance between the first edge and the first end is h,1mm ∈h ∈10mm.

8. The battery cell of claim 1, wherein the electrode assembly includes an electrode body and a tab connected to the electrode body, the first edge of the separator being closer to the first end than the top of the electrode body in a height direction of the housing assembly.

9. A battery comprising a cell according to any one of claims 1-8.

10. A powered device comprising the battery cell of any one of claims 1-8 or the battery of claim 9.