CN221407472U

CN221407472U - Battery monomer, battery, energy storage device and electricity utilization device

Info

Publication number: CN221407472U
Application number: CN202420980726.5U
Authority: CN
Inventors: 杨长乐
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-05-08
Filing date: 2024-05-08
Publication date: 2024-07-23
Anticipated expiration: 2034-05-08

Abstract

The application discloses a battery monomer, a battery, an energy storage device and an electricity utilization device, and belongs to the technical field of batteries. The battery cell includes: a housing having a receiving cavity; an electrode assembly disposed in the receiving chamber; the insulating outer film, insulating outer film cladding is in the at least partial surface of shell, insulating outer film includes first overlap joint portion and second overlap joint portion, first overlap joint portion laminating is in the surface of shell, the second overlap joint portion is including the cladding portion of laminating the surface of shell, laminating the overlap portion of the surface of first overlap joint portion and connecting in cladding portion and overlap the transition portion between the surface of shell, the surface of the edge of transition portion, first overlap joint portion and shell encloses the pore, the at least part of the surface that is located the pore of shell has attached first inoxidizing coating, first inoxidizing coating can not be soaked by electrolyte. The battery monomer, the battery, the energy storage device and the power utilization device provided by the application have longer service lives.

Description

Battery monomer, battery, energy storage device and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery, an energy storage device and an electricity utilization device.

Background

New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side.

With the continuous development of battery technology, the industry is continually placing higher demands on the service life of batteries.

Disclosure of utility model

In order to solve the technical problems, the application provides a battery monomer, a battery, an energy storage device and an electricity utilization device which can prolong the service life.

The application is realized by the following technical scheme.

A first aspect of the present application provides a battery cell comprising: a housing having a receiving cavity; an electrode assembly disposed within the receiving chamber; the insulating outer film, insulating outer film cladding in at least part surface of shell, insulating outer film include first overlap joint portion and second overlap joint portion, first overlap joint portion laminate in the surface of shell, the second overlap joint portion including laminate of the surface of shell, laminate first overlap joint portion the back of the surface of shell and connect in laminate between the transition portion, the transition portion the edge of first overlap joint portion with the surface of shell encloses the pore space, the at least part of the surface that is located of shell in the hole has attached first inoxidizing coating, first inoxidizing coating can not be soaked by electrolyte.

Because the first protective layer is attached to at least part of the outer surface of the shell, which is positioned in the hole, and electrolyte cannot infiltrate the first protective layer, the probability that electrolyte climbs along the outer surface of the shell is reduced, and the electrolyte does not infiltrate the first protective layer, and the electrolyte positioned in the hole can descend along the first protective layer and can descend below the liquid level of the electrolyte outside the shell, so that the electrolyte entering the hole is reduced, the contact probability of the electrolyte and the shell is reduced, the phenomenon of electrical conduction between the shells is not easy to occur, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

In some embodiments, the aperture extends along a first direction that intersects the horizontal direction, and the first protective layer extends from a bottom end of the aperture up to a set location along the first direction.

The lower part of the outer surface of the shell, which is positioned in the hole, is covered by the first protective layer, and leaked electrolyte is almost gathered at the bottom of the shell, so that the arrangement further reduces the ascending probability of the electrolyte along the hole, further reduces the contact probability of the electrolyte and the outer surface of the shell, and is not easy to cause the phenomenon of electrical conduction between the shells, thereby reducing the influence on the normal functions of other battery monomers and further prolonging the service life of the whole battery.

In some embodiments, at least a portion of the surface of the transition located within the aperture has a second protective layer attached thereto, the second protective layer being impermeable to the electrolyte.

The arrangement of the second protective layer ensures that electrolyte is not easy to climb along the transition part of the insulating outer film, thereby further reducing the ascending probability of the electrolyte along the pores, further reducing the contact probability of the electrolyte and the outer surface of the shell, further reducing the phenomenon of electric conduction between the shells, reducing the influence on the normal functions of other battery monomers and further prolonging the service life of the whole battery.

In some embodiments, the aperture extends along a first direction that intersects the horizontal direction, and the second protective layer extends from a bottom end of the aperture up to a set location along the first direction.

The second inoxidizing coating extends to the settlement position department along first direction from the bottom of hole for the position department that is close to in hole sets up first inoxidizing coating and second inoxidizing coating, and, because the electrolyte of leakage almost all gathers in the bottom of shell, consequently, so set up, further reduced the electrolyte and upwards climbed along the hole probability, further reduced the contact probability of electrolyte and shell surface, thereby be difficult for taking place the phenomenon of electric conduction between the shell, thereby reduced the influence to other battery monomer's normal function, and then prolonged the life of whole battery.

In some embodiments, at least a portion of the surface of the first overlap within the aperture has a third protective layer attached thereto, the third protective layer being impermeable to the electrolyte.

The arrangement of the third protective layer enables electrolyte not to climb along the first lap joint part of the insulating outer film easily, the probability that the electrolyte climbs upwards along the pore is further reduced, the contact probability of the electrolyte and the outer surface of the shell is further reduced, and therefore the phenomenon of electrical conduction between the shells is not easy to occur, the influence on normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

In some embodiments, the aperture extends along a first direction intersecting a horizontal direction, and the third protective layer extends from a bottom end of the aperture up to a set position along the first direction.

The third inoxidizing coating extends to the settlement position department along first direction from the bottom of hole for the position department that is located down in hole sets up first inoxidizing coating and third inoxidizing coating, and, because the electrolyte of leakage almost all gathers in the bottom of shell, consequently, so set up, further reduced the electrolyte and upwards climbed along the hole probability, further reduced the contact probability of electrolyte and shell surface, thereby be difficult for taking place the phenomenon of electric conduction between the shell, thereby reduced the influence to other battery monomer's normal function, and then prolonged the life of whole battery.

In some embodiments, the set position is spaced from the bottom end of the aperture by no less than one half of the total length of the aperture along the first direction.

In this way, the size of the outer surface of the shell in the pore is controlled within a proper range, the size of the surface of the transition part in the pore is controlled within a proper range, and the size of the surface of the first lap part in the pore is controlled within a proper range, so that the materials of the first protective layer, the second protective layer and the third protective layer are saved, the ascending rate of electrolyte along the pore is reduced, the phenomenon of electrical conduction between the shells is not easy to occur, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

In some embodiments, the set position is spaced from the bottom end of the aperture by no less than two-thirds of the total length of the aperture along the first direction.

So for first inoxidizing coating covers the surface that is enough of the shell in the hole, the surface that is enough of the transition portion in the second inoxidizing coating covers the hole to and the surface that is enough of the first overlap joint portion in the third inoxidizing coating covers the hole, further reduce the probability that electrolyte climbs along the hole, thereby the phenomenon of electric conduction between the difficult emergence shell, thereby reduced the influence to other battery monomer's normal function, and then prolonged the life of whole battery.

In some embodiments, the intersections include vertical intersections.

Under the condition of vertical intersection, the first direction extends along the vertical direction, and due to the arrangement of the first protective layer, the ascending rate of electrolyte along the vertical direction can be reduced, the contact rate of electrolyte and the outer surface of the shell is further reduced, and therefore the phenomenon of electrical conduction between the shells is not easy to occur, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

In some embodiments, the first protective layer is an insulating material.

Therefore, the first protective layer plays an insulating role on the shell, and even if the electrolyte contacts the shell, the phenomenon of electrical conduction cannot occur, so that the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

In some embodiments, the material of the first protective layer includes any one of polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene, and neoprene.

The material not only meets the condition that electrolyte is not infiltrated, but also can reduce the climbing probability of the electrolyte along the pores, and the material belongs to an insulating material, so that the probability of electric conduction between the shells can be further reduced, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

A second aspect of the present application provides a battery comprising: at least one of the above-described battery cells.

Since the battery includes the battery cells, the battery includes all the advantageous effects possessed by the battery cells, and thus, the service life of the battery is prolonged.

In some embodiments, the battery further comprises a battery box, and the battery cell is arranged in the battery box.

Thus, the battery forms a battery pack, and the battery pack has long service life.

In some embodiments, a heat exchange plate is disposed between the battery cell and the bottom wall of the battery case.

Therefore, the thermal management of the battery pack can be realized, and the service life of the battery pack can be prolonged. And after the phenomenon that electrolyte leaks occurs in one battery monomer, the electrolyte spreads to other battery monomers along the heat exchange plate, and as the first protective layer is arranged in the pore of each battery monomer and cannot be soaked by the electrolyte, the electrolyte cannot climb along the outer surface of the shell attached with the first protective layer, so that the phenomenon of electrical conduction between the shells of the battery monomers cannot occur easily, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery pack is prolonged.

A third aspect of the present application provides an energy storage device comprising a battery cell as described above or a battery as described above.

Because the energy storage device comprises a battery cell or a battery, the energy storage device comprises all the beneficial effects of the battery cell or the battery, and therefore the service life of the energy storage device is prolonged.

A fourth aspect of the present application provides an electrical device comprising the above-described battery cell or the above-described battery for providing electrical energy.

Because the electricity utilization device comprises a battery cell or a battery, the service life of the electricity utilization device is prolonged because the electricity utilization device comprises all the beneficial effects of the battery cell or the battery.

Disclosure of utility model

The application provides a battery cell, a battery, an energy storage device and an electric device which can prolong the service life.

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 application. 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 present application;

fig. 2 is an exploded perspective view of a battery provided in some embodiments of the application;

Fig. 3 is a schematic perspective view of a battery cell according to some embodiments of the present application;

Fig. 4 is an exploded perspective view of a battery cell according to some embodiments of the present application;

Fig. 5 is a cross-sectional view of a battery cell according to some embodiments of the present application taken along a horizontal direction;

FIG. 6 is an enlarged view at A in FIG. 5;

Fig. 7 is a front view of the internal structure of a battery provided in some embodiments of the present application.

Description of the reference numerals

1000. A vehicle; 100. a battery; 200. a controller; 300. a motor; 10. a battery box; 101. a case cover; 102. a case; 1021. a bottom wall; 20. a battery cell;

1. A housing; 11. an end cap; 12. a housing; 2. an electrode assembly; 21. a negative electrode tab; 22. a positive electrode tab; 3. an insulating outer film; 31. a first lap joint; 32. a second lap joint; 321. a coating section; 322. an overlapping portion; 323. a transition section; 4. a void; 5. a first protective layer; 6. a second protective layer; 7. a third protective layer; 8. a heat exchange plate; 9. a pole; 30. a pressure release mechanism; 40. end cover paster; 50. a transfer sheet; 60. an insulating sheet.

Detailed Description

Embodiments of the technical scheme of the present application 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 application, and thus are merely examples, and are not intended to limit the scope of the present application.

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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and in the description of the drawings above are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not 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 application, 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 application. 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 application, 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 this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are orientation or positional relationship based on the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, 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 application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

The present application will be described in detail below.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy 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 a plurality of fields such as aerospace. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In some embodiments of the application, the battery may be a battery cell (also commonly referred to as a cell).

In an embodiment of the present application, a plurality means two or more.

In some embodiments of the present application, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments of the application, the battery may be a battery pack including a battery case and a battery cell, the battery cell or battery module being accommodated in the battery case.

In some embodiments of the present application, a battery cell includes an electrode assembly, which is a component of the battery cell that is subject to an electrochemical reaction, disposed within the housing, and a blue film, which is coated on an outer surface of the housing, for protecting and insulating the housing.

The inventors of the present application have noted that the outer case of the battery cell adopts a manner of overlapping and covering the inner and outer layers at the junction of the blue films when the blue films are coated, and a pore extending in the vertical direction is formed at the beginning of the inner layer blue film, the pore is similar to a capillary, and in the case that the bottom of the battery cell has an electrolyte, the electrolyte may have a capillary phenomenon at the pore. The capillary phenomenon is a phenomenon that the infiltrating liquid rises in the tubule and a phenomenon that the non-infiltrating liquid falls in the tubule, also called capillary action, and refers to a phenomenon that the liquid rises or falls on the inner side of the tubule-shaped object due to the difference of cohesive force and adhesive force. When the adhesive force between the liquid and the solid (pipe wall) is larger than the cohesive force of the liquid, the liquid infiltrates the container, if a certain liquid can infiltrate a certain substance, a thin pipe with smaller diameter and made of the substance is inserted into the liquid, and the liquid in the thin pipe can rise; if a liquid cannot infiltrate a substance, a small tubule made of the substance is inserted into the liquid, and the liquid in the tubule is lowered. Typically, the housing is made of a metal material and the electrolyte is a wetting liquid for the metal material, i.e. the electrolyte will climb up the pores. In a battery comprising a plurality of battery monomers, after the phenomenon of electrolyte leakage of one battery monomer occurs, the electrolyte spreads along the bearing surface of the bearing battery monomer towards other battery monomers, and the electrolyte can generate capillary phenomenon at the pore of the blue film of other battery monomers and climb along the pore to contact with the shell, so that the shells of the adjacent battery monomers or the shells of the battery monomers far away from each other are electrically conducted, insulation failure between the shells can influence normal functions of other battery monomers, and the service life of the whole battery is influenced.

Through researches, the inventor of the application discovers that by attaching the protective layer which is not infiltrated by the electrolyte on the surface of the shell in the pore, the climbing rate of the electrolyte along the surface of the shell can be reduced, so that the contact rate of the electrolyte with the shell is reduced, the phenomenon of electric conduction between the shells of the battery monomers is not easy to occur, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

Based on such design concept, the inventor of the present application devised a battery cell including a case having a receiving chamber, an electrode assembly disposed in the receiving chamber, and an insulating outer film; the insulating outer membrane cladding is in the at least partial surface of shell, the insulating outer membrane includes first overlap joint portion and second overlap joint portion, first overlap joint portion laminating in the surface of shell, the second overlap joint portion includes the cladding portion of laminating with the surface of shell, laminating first overlap joint portion the overlap portion of the surface of keeping away from the shell and connect the transition portion between cladding portion and overlap portion, the hole gap is enclosed to the edge of transition portion, first overlap joint portion and the surface of shell, the at least part of the surface that is located the hole of shell has attached first inoxidizing coating, first inoxidizing coating can not be soaked by electrolyte.

The first protective layer which is not infiltrated by the electrolyte is attached to the surface of the shell in the pore, so that the climbing rate of the electrolyte along the surface of the shell can be reduced, the contact rate of the electrolyte with the shell is reduced, the phenomenon of electric conduction between the shells of the battery monomers is not easy to occur, the influence on the normal functions of other battery monomers is reduced, and the service life of the whole battery is prolonged.

The battery cell provided by the embodiment of the application can be used in an electric device or an energy storage device, and the electric device can be a vehicle, a ship, an aircraft or the like. For example, cell phones, portable devices, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft, etc. The energy storage device may be, but is not limited to, an energy storage container, an energy storage electric cabinet, or the like.

The present application also provides a battery that may include one or more battery cells to provide a single physical module of higher voltage and capacity. When a plurality of battery cells are provided, the plurality of battery cells are connected in series, in parallel or in series-parallel through the converging component.

The battery provided by the embodiment of the application can be used in an electric device or an energy storage device, and the electric device can be a vehicle, a ship, an aircraft or the like. For example, cell phones, portable devices, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft, etc. The energy storage device may be, but is not limited to, an energy storage container, an energy storage electric cabinet, or the like.

The embodiment of the application also provides an energy storage device. The energy storage device comprises a battery cell or a battery.

The energy storage device provided by the embodiment of the application can be, but is not limited to, an energy storage container, an energy storage electric cabinet and the like.

The embodiment of the application also provides an electric device, which comprises a battery cell or a battery for providing electric energy.

The power utilization device provided by the embodiment of the application 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 car, 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.

In the following embodiments, for convenience of explanation, the electric device according to an embodiment of the present application will be described by taking the vehicle 1000 as an example. The following description refers to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application.

The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. As shown in fig. 1, the battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Fig. 2 is an exploded perspective view of a battery 100 according to an embodiment of the present application.

As shown in fig. 2, the battery 100 includes a battery case 10 and at least one battery cell 20, an accommodating space is provided in the battery case 10, and the at least one battery cell 20 is accommodated in the accommodating space.

In some embodiments of the present application, the battery case 10 includes a case 102 and a case cover 101, the case cover 101 covering over the case 102, thereby forming the receiving space between the case 102 and the case cover 101.

The case body 102 may have a hollow structure with an opening at one end, the case cover 101 may have a plate-shaped structure, and the case cover 101 covers the opening side of the case body 102, so that the case cover 101 and the case body 102 together define an accommodating space; the case cover 101 and the case 102 may be hollow structures each having one side open, and the open side of the case cover 101 may be closed to the open side of the case 102. Of course, the battery case 10 formed by the case cover 101 and the case body 102 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

The battery cell 20 refers to the smallest unit constituting the battery. In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 20 is placed in the accommodating space formed by the box body 102 and the box cover 101; of course, the battery 100 may be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in an accommodating space formed by the case 102 and the case cover 101. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

In the embodiment of the present application, the battery cell 20 may be a secondary battery, and the secondary battery refers to a battery cell that can be continuously used by activating the active material in a charging manner after the battery cell is discharged.

The battery cell 20 may be a lithium ion battery, a sodium-lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead storage battery, etc., which is not limited by the embodiment of the application.

In some embodiments of the application, the battery box 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the battery box 10 may become at least a portion of the floor of the vehicle 1000, or a portion of the battery box 10 may become at least a portion of the cross member and the side member of the vehicle 1000.

Some embodiments of the present application are described in detail below with reference to fig. 3 to 7.

Fig. 3 is a schematic perspective view of a battery cell according to some embodiments of the present application; fig. 4 is an exploded perspective view of a battery cell according to some embodiments of the present application; fig. 5 is a cross-sectional view of a battery cell according to some embodiments of the present application taken along a horizontal direction; FIG. 6 is an enlarged view at A in FIG. 5; fig. 7 is a front view of the internal structure of a battery provided in some embodiments of the present application.

A first aspect of the present application provides a battery cell 20, as shown in fig. 3 to 6, the battery cell 20 including a case 1, an electrode assembly 2, and an insulating outer film 3, the case 1 having a receiving cavity; the electrode assembly 2 is disposed in the accommodating chamber; the insulating outer film 3 is coated on at least part of the outer surface of the shell 1, the insulating outer film 3 comprises a first lap joint part 31 and a second lap joint part 32, the first lap joint part 31 is attached to the outer surface of the shell 1, the second lap joint part 32 comprises a coating part 321 attached to the outer surface of the shell 1, an overlapping part 322 attached to the surface of the first lap joint part 31, which is back to the shell 1, and a transition part 323 connected between the coating part 321 and the overlapping part 322, a pore 4 is surrounded by the edge of the transition part 323 and the first lap joint part 31 and the outer surface of the shell 1, a first protective layer 5 is attached to at least part of the outer surface of the shell 1, which is positioned in the pore 4, and the first protective layer 5 cannot be infiltrated by electrolyte.

It will be appreciated that the second overlap 32 partially conforms to the outer surface of the housing 1, and partially conforms to the surface of the first overlap 31 facing away from the housing 1, and that since the first overlap 31 has a thickness, the second overlap 32 is supported by the first overlap 31 to a certain height, a triangular-like aperture 4 is formed at the starting end of the first overlap 31, the aperture 4 being defined by the surface at the edge of the first overlap 31, the inner surface of the transition 323 of the second overlap 32 and the outer surface of the housing 1.

The electrode assembly 2 is a component in which electrochemical reactions occur in the battery cells 20. One or more electrode assemblies 2 may be contained within the case 1. The electrode assembly 2 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive pole piece and the negative pole piece with active substances form a main body part of the electrode assembly, and the parts of the positive pole piece and the negative pole piece without active substances form electrode lugs respectively. The positive electrode tab 22 and the negative electrode tab 21 may be located at one end of the main body or at both ends of the main body. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte.

The case 1 has a shell-like structure for sealing the electrode assembly 2 and the electrolyte. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like. The outer surface of the housing 1 represents the surface of the housing 1 facing away from the receiving chamber.

The insulating outer film 3 is a film having insulating properties and covering the outer surface of the casing 1. The insulating outer film 3 is made of polyolefin film, polypropylene or polyethylene, and has the characteristics of high transparency, high stretchability, temperature resistance and the like, and the insulating outer film 3 can prevent the battery cell 20 from being corroded by external substances such as water vapor, dust and the like, has the functions of skid resistance and fingerprint resistance, and is beneficial to protecting the service life of the battery cell 20; moreover, the insulating outer film 3 has insulating and isolating effects, reduces short circuit risks, and also plays a certain role in heat dissipation, and slows down the temperature rise speed of the battery cells 20, thereby prolonging the service life.

It will be appreciated that the insulating outer film 3 of the same cell 20 may form a section of the linearly extending aperture 4, or may form multiple sections of the linearly extending aperture 4; at least two sections of pores 4 can be communicated with each other, or each section of pores 4 can be independent and not communicated with each other.

The first protective layer 5 cannot be infiltrated by the electrolyte, that is, the electrolyte cannot infiltrate the first protective layer 5, so that the electrolyte cannot climb along the outer surface of the housing 1 to which the first protective layer 5 is attached, and according to the capillary phenomenon, the electrolyte in the pores 4 can drop below the liquid level of the electrolyte outside the housing 1 due to the electrolyte not infiltrating the first protective layer 5, so that the electrolyte entering the pores 4 can be reduced, the contact probability of the electrolyte and the housing 1 is reduced, the phenomenon of electrical conduction between the housings 1 of the battery cells 20 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is prolonged. The material of the first protective layer 5 may be selected from, but not limited to, polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene and neoprene.

The attachment means that the first shielding layer 5 is connected to and covers the outer surface of the casing 1 such that the first shielding layer 5 is spaced between the electrolyte and the outer surface of the casing 1 such that the electrolyte does not directly contact the outer surface of the casing 1. The first protective layer 5 may be attached to the outer surface of the outer envelope 1 by means of adhesion, welding or coating, etc.

Because the first protective layer 5 is attached to at least part of the outer surface of the casing 1, which is positioned in the hole 4, and the electrolyte cannot infiltrate the first protective layer 5, the probability that the electrolyte climbs along the outer surface of the casing 1 is reduced, and the electrolyte does not infiltrate the first protective layer 5, and the electrolyte positioned in the hole 4 can descend along the first protective layer 5 and can descend below the liquid level of the electrolyte outside the casing 1, so that the electrolyte entering the hole 4 is reduced, the contact probability of the electrolyte and the casing 1 is reduced, the phenomenon of electrical conduction between the casings 1 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the present application, as shown in fig. 3 and 4, the case 1 includes an end cap 11 and a case 12, the case 12 has a receiving cavity and an opening, the electrode assembly 2 is disposed in the receiving cavity, the end cap 11 closes the opening of the case 12, the end cap 11 or any wall surface of the case 12 is provided with a post 9, and the post 9 is connected to a tab of the electrode assembly 2 for inputting or outputting electric power.

The end cap 11 refers to a member that is covered at the opening of the case 12 to isolate the inner environment of the battery cell 20 from the outer environment. Without limitation, the shape of the end cap 11 may be adapted to the shape of the housing 12 to fit the housing 12. Optionally, the end cover 11 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 11 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The electrode post 9 is electrically connected to the electrode assembly 2 for outputting or inputting electric power of the battery cell 20.

In some embodiments of the present application, as shown in fig. 4, the end cover 11 may further be provided with a pressure release mechanism 30 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value, and a protective patch of the pressure release mechanism is attached to the outer side of the pressure release mechanism 30. The material of the end cap 11 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments of the application, an insulating structure may also be provided on the inside of the end cap 11, which may be used to isolate electrical connection components within the housing 12 from the end cap 11 to reduce the risk of short circuits. By way of example, the insulating structure may be plastic, rubber, or the like.

The case 12 is an assembly for cooperating with the end cap 11 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 2, electrolyte, and other components. The case 12 and the end cap 11 may be separate components, and an opening may be provided in the case 12, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 11 at the opening. It is also possible to integrate the end cap 11 and the housing 12, but specifically, the end cap 11 and the housing 12 may form a common connection surface before other components are put into the housing, and when the interior of the housing 12 needs to be sealed, the end cap 11 is then covered with the housing 12. The housing 12 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 12 may be determined according to the specific shape and size of the electrode assembly 2. The material of the housing 12 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

In some embodiments of the present application, as shown in fig. 3 and 4, all the outer surfaces of the case 12 are covered with the insulating outer film 3, and the outer surfaces of the end caps 11 are attached with the end cap patches 40. In some embodiments of the present application, an insulating sheet 60 is attached to the inner wall of the case 12, and the insulating sheet 60 serves to insulate the electrode assembly 2 from the case 12.

In some embodiments of the present application, as shown in fig. 3 and 4, the end cap 11 is provided with two poles 9, and the two poles 9 are respectively connected to the positive electrode tab 22 and the negative electrode tab 21 of the electrode assembly 2 through the switching pieces 50, such that the two poles 9 become the positive electrode tab and the negative electrode tab, respectively.

In some embodiments of the application, as shown in fig. 5, apertures 4 are formed on two opposite outer surfaces of the housing 1, and at least a portion of the outer surface of the housing 1 located within each aperture 4 is attached with a first protective layer 5.

In this way, the contact probability of the electrolyte and the outer surface of the inner shell 1 of each pore 4 is reduced, so that the phenomenon of electrical conduction between the shells 1 is not easy to occur, the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the application, the aperture 4 extends along a first direction X intersecting the horizontal direction, and the first protective layer 5 extends from the bottom end of the aperture 4 up to a set position along the first direction X.

The bottom end of the aperture 4 represents the end of the aperture 4 at the lowest level, and the first protective layer 5 extends upward from the bottom end of the aperture 4 to the set position along the first direction X, that is, one end of the first protective layer 5 along the first direction X is at the bottom end of the aperture 4, and the other end is at the set position, that is, the area of the outer surface of the housing 1 located inside the aperture 4 between the bottom end of the aperture 4 and the set position is covered with the first protective layer 5, and the distance between the bottom end of the aperture 4 and the set position is the dimension of the first protective layer 5 along the first direction X, so that the first protective layer 5 is disposed at the position below the aperture 4.

The setting position may be any position of the aperture 4 other than the bottom end thereof, may be the top end thereof, may be the intermediate position thereof, may be three to two positions thereof, and the like.

The lower part of the outer surface of the shell 1, which is positioned in the hole 4, is covered by the first protective layer 5, and leaked electrolyte is almost gathered at the bottom of the shell 1, so that the arrangement further reduces the ascending probability of the electrolyte along the hole 4, further reduces the contact probability of the electrolyte and the outer surface of the shell 1, and therefore, the phenomenon of electrical conduction between the shells 1 is not easy to occur, the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the application, at least part of the surface of the transition 323 lying within the aperture 4 has a second protective layer 6 attached thereto, the second protective layer 6 being impermeable to the electrolyte.

The second protective layer 6 cannot be infiltrated by the electrolyte, that is, the electrolyte cannot infiltrate the second protective layer 6, so that the electrolyte cannot climb along the transition portion 323 to which the second protective layer 6 is attached, and according to the capillary phenomenon, the electrolyte in the pores 4 can drop below the liquid level of the electrolyte outside the casing 1 due to the electrolyte not infiltrating the second protective layer 6, so that the electrolyte entering the pores 4 can be reduced, the contact probability of the electrolyte and the casing 1 is reduced, the phenomenon of electrical conduction between the casings 1 of the battery cells 20 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is prolonged. The material of the second protective layer 6 may be selected from, but not limited to, polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene and neoprene.

The arrangement of the second protective layer 6 ensures that electrolyte is not easy to climb along the transition part 323 of the insulating outer film 3, thereby further reducing the ascending probability of the electrolyte along the pores 4, further reducing the contact probability of the electrolyte and the outer surface of the shell 1, further reducing the phenomenon of electrical conduction between the shells 1, reducing the influence on the normal functions of other battery monomers 20 and further prolonging the service life of the whole battery.

In some embodiments of the present application, the location to which the second protective layer 6 extends from the bottom end of the aperture 4 in the first direction X may be at the same height as the location to which the first protective layer 5 extends, or may be at a different height.

In some embodiments of the application, the aperture 4 extends along a first direction X intersecting the horizontal direction, and the second protective layer 6 extends from the bottom end of the aperture 4 up to a set position along the first direction X.

The second protection layer 6 extends upwards from the bottom end of the hole 4 to a set position along the first direction X, that is, one end of the second protection layer 6 along the first direction X is at the bottom end of the hole 4, and the other end is at the set position, that is, the area of the surface of the transition portion 323 located in the hole 4 between the bottom end of the hole 4 and the set position is full of the second protection layer 6, the distance between the bottom end of the hole 4 and the set position is the size of the second protection layer 6 along the first direction X, so that the first protection layer 5 and the second protection layer 6 are arranged at the position below the hole 4, and because leaked electrolyte is almost gathered at the bottom of the shell 1, the arrangement further reduces the ascending probability of the electrolyte along the hole 4, further reduces the contact probability of the electrolyte and the outer surface of the shell 1, thereby the phenomenon of electrical conduction between the shell 1 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is further prolonged.

In some embodiments of the application, at least part of the surface of the first overlap 31 located within the aperture 4 has a third protective layer 7 attached thereto, the third protective layer 7 being impermeable to the electrolyte.

The third protective layer 7 cannot be infiltrated by the electrolyte, that is, the electrolyte cannot infiltrate the third protective layer 7, so that the electrolyte cannot climb along the first lap joint portion 31 to which the third protective layer 7 is attached, and according to the capillary phenomenon, the electrolyte in the aperture 4 can drop below the liquid level of the electrolyte outside the housing 1 due to the electrolyte not infiltrating the third protective layer 7, so that the electrolyte entering the aperture 4 can be reduced, the contact probability of the electrolyte and the housing 1 is reduced, the phenomenon of electrical conduction between the housings 1 of the battery cells 20 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is prolonged. The material of the third protective layer 7 may be selected from, but not limited to, polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene and neoprene.

The arrangement of the third protective layer 7 ensures that electrolyte is not easy to climb along the first lap joint part 31 of the insulating outer film 3, thereby further reducing the ascending probability of the electrolyte along the pores 4, further reducing the contact probability of the electrolyte and the outer surface of the shell 1, further reducing the phenomenon of electrical conduction between the shells 1, reducing the influence on the normal functions of other battery monomers 20 and further prolonging the service life of the whole battery.

In some embodiments of the present application, the position to which the third protective layer 7 extends from the bottom end of the aperture 4 along the first direction X and the position to which the first protective layer 5 extends may be located at the same position or at different positions and heights, which is not limited herein specifically.

In some embodiments of the application, the aperture 4 extends along a first direction X intersecting the horizontal direction, and the third protective layer 7 extends from the bottom end of the aperture 4 up to a set position along the first direction X.

The third protection layer 7 extends upwards from the bottom end of the hole 4 to a set position along the first direction X, that is, one end of the third protection layer 7 along the first direction X is at the bottom end of the hole 4, and the other end is at the set position, that is, the area, between the bottom end of the hole 4 and the set position, of the surface of the first lap joint part 31 in the hole 4 is covered with the third protection layer 7, the distance between the bottom end of the hole 4 and the set position is the size of the third protection layer 7 along the first direction X, so that the first protection layer 5 and the third protection layer 7 are arranged at the position, which is lower than the hole 4, and the leaked electrolyte is almost gathered at the bottom of the shell 1, so that the arrangement further reduces the ascending probability of the electrolyte along the hole 4, further reduces the contact probability of the electrolyte and the outer surface of the shell 1, thereby the phenomenon of electrical conduction between the shell 1 is not easy to occur, the influence on the normal functions of other battery cells 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the application, the distance between the set position and the bottom end of the aperture 4 is not less than half the total length of the aperture 4 along the first direction X.

The distance between the set position and the bottom end of the hole 4 along the first direction X is the dimension of the first protective layer 5, the second protective layer 6 or the third protective layer 7 along the first direction X. Illustratively, as shown in FIG. 7, the hatched portion in the aperture 4 indicates the first protection layer 5, the bottom end of the first protection layer 5 is at the bottom end of the aperture 4, the top end of the first protection layer 5 is at the set position, the dimension of the first protection layer 5 in the first direction X is L1 in FIG. 7, and the length of the aperture 4 is L2 in FIG. 7, so that L1/L2 is not less than 1/2.

Illustratively, the ratio of the spacing of the set locations to the bottom ends of the apertures 4 to the total length of the apertures 4 may be 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/9, 9/10, or 1.

In this way, the size of the outer surface of the casing 1 in the aperture 4 covered by the first protection layer 5 is controlled within a proper range, the size of the surface of the transition portion 323 in the aperture 4 covered by the second protection layer 6 is controlled within a proper range, and the size of the surface of the first lap portion 31 in the aperture 4 covered by the third protection layer 7 is controlled within a proper range, which is beneficial to saving the materials of the first protection layer 5, the second protection layer 6 and the third protection layer 7, and reducing the ascending probability of electrolyte along the aperture 4, thereby preventing the phenomenon of electrical conduction between the casings 1, reducing the influence on the normal functions of other battery cells 20, and further prolonging the service life of the whole battery.

In some embodiments of the application, the distance between the set position and the bottom end of the aperture 4 along the first direction X is not less than two-thirds of the total length of the aperture 4.

Illustratively, as shown in FIG. 7, the hatched portion in the aperture 4 indicates the first protection layer 5, the bottom end of the first protection layer 5 is at the bottom end of the aperture 4, the top end of the first protection layer 5 is at the set position, the dimension of the first protection layer 5 in the first direction X is L1 in FIG. 7, and the length of the aperture 4 is L2 in FIG. 7, so that L1/L2 is not less than 2/3.

In this way, the first protective layer 5 covers the sufficiently large outer surface of the casing 1 in the aperture 4, the second protective layer 6 covers the sufficiently large surface of the transition portion 323 in the aperture 4, and the third protective layer 7 covers the sufficiently large surface of the first lap portion 31 in the aperture 4, so that the probability of the electrolyte climbing up along the aperture 4 is further reduced, the phenomenon of electrical conduction between the casings 1 is less likely to occur, the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is further prolonged.

In some embodiments of the application, the set position is the top end of the aperture 4.

In this way, the inner surface of the hole 4 is fully covered by the first protective layer 5, the second protective layer 6 and the third protective layer 7, so that the climbing probability of the electrolyte along the hole 4 is further reduced, the contact probability of the electrolyte and the shell 1 is reduced, the phenomenon of electrical conduction between the shells 1 is not easy to occur, the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the application, the intersection comprises a vertical intersection.

Under the condition of vertical intersection, the first direction X extends along the vertical direction, and due to the arrangement of the first protective layer 5, the ascending rate of electrolyte along the vertical direction can be reduced, the contact rate of the electrolyte and the outer surface of the shell 1 is further reduced, and thus the phenomenon of electrical conduction between the shells 1 is not easy to occur, the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the application, the first protective layer 5 is an insulating material.

In this way, the first protection layer 5 plays an insulating role on the shell 1, and even if the electrolyte contacts the shell 1, the phenomenon of electrical conduction cannot occur, so that the influence on the normal functions of other battery monomers 20 is reduced, and the service life of the whole battery is prolonged.

In some embodiments of the present application, the material of the first protective layer 5 includes at least one of polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene, and neoprene.

The material not only meets the condition that electrolyte is not infiltrated, can reduce the climbing probability of the electrolyte along the pores 4, but also belongs to insulating materials, and can further reduce the probability of electrical conduction between the shells 1, thereby reducing the influence on the normal functions of other battery monomers 20 and further prolonging the service life of the whole battery.

In some embodiments of the present application, the first protective layer 5, the second protective layer 6 and the third protective layer 7 are made of the same material.

In this way, the convenience and the manufacturing efficiency of the first protective layer 5, the second protective layer 6 and the third protective layer 7 are improved.

In some embodiments of the present application, the first protective layer 5, the second protective layer 6 and the third protective layer 7 are formed by coating.

The coating mode is convenient to operate, and the first protective layer 5, the second protective layer 6 and the third protective layer 7 formed by coating are strong in attachment firmness.

In some embodiments of the present application, the material of the insulating outer film 3 includes at least one of polypropylene, polyethylene, polybutylene, and polyethylene terephthalate.

Regarding the formation of the first, second and third protective layers 5, 6 and 7, the first, second and third protective layers 5, 6 and 7 may be designed and formed at the time of the manufacture of the insulating outer film 3 such that the inner surfaces of the pores 4 are covered with the first, second and third protective layers 5, 6 and 7 while the coating of the battery cells 20 is completed.

A second aspect of the present application provides a battery 100, the battery 100 comprising at least one battery cell 20 provided in the first aspect.

Since the battery 100 includes the battery cells 20, the battery 100 includes all the advantageous effects that the battery cells 20 have, and thus, the service life of the battery 100 is prolonged.

In some embodiments of the present application, the battery 100 further includes a battery case 10, and the battery cells 20 are disposed in the battery case 10.

In this way, the battery 100 is formed into a battery pack having a long service life.

In some embodiments of the present application, as shown in fig. 2 and 7, a heat exchange plate 8 is provided between the battery cell 20 and the bottom wall 1021 of the battery case 10.

The heat exchange plate 8 includes, but is not limited to, a water cooling plate for heat exchange with the battery cells 20 to control the temperature of the battery within a certain range, thereby achieving heat management of the battery. The heat exchange plate 8 may be adhered to the outer bottom surface of the battery cell 20 by an adhesive. In the case of being adhered to the battery cell 20 by an adhesive, the adhesive adopts a heat conductive adhesive to realize heat conduction between the heat exchange plate 8 and the battery cell 20.

Therefore, the thermal management of the battery can be realized, and the service life of the battery is further prolonged. And after the phenomenon that electrolyte leaks in one battery monomer, the electrolyte spreads to other battery monomers 20 along the heat exchange plate 8, and as the first protective layer 5 is arranged in the pore 4 of each battery monomer 20, the first protective layer 5 cannot be soaked by the electrolyte, so that the electrolyte cannot climb along the outer surface of the shell 1 attached with the first protective layer 5 easily, and the phenomenon of electrical conduction between the shells 1 of the battery monomers 20 cannot easily occur, thereby reducing the influence on the normal functions of other battery monomers 20, and further prolonging the service life of the whole battery pack.

A third aspect of the present application provides an energy storage device comprising the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect.

Since the energy storage device includes the battery cell 20 or the battery 100, the energy storage device includes all the advantageous effects of the battery cell 20 or the battery 100, and thus, the service life of the energy storage device is prolonged.

A fourth aspect of the present application provides an electric device comprising the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect for providing electric energy.

Since the electricity consumption device includes the battery cell 20 or the battery 100, the electricity consumption device includes all the advantageous effects possessed by the battery cell 20 or the battery 100, and thus, the service life of the electricity consumption device is prolonged.

Specific examples of some embodiments of the present application are described below with reference to the drawings.

As a specific example, there is provided a battery cell (battery cell 20), wherein a blue film (insulating outer film 3) is coated outside a case (case 1) of the battery cell, capillaries (pores 4) are formed at overlapping positions of the blue films, a non-wetting electrolyte material (second protective layer 6 and third protective layer 7) is coated on a surface of the blue film in the capillaries, and a non-wetting electrolyte material (first protective layer 5) is coated on a surface of the case in the capillaries.

Therefore, a layer of material which does not infiltrate electrolyte is coated at the position of the capillary, when the electric core in the electric box (battery box 10) is out of control, the electrolyte which does not infiltrate due to the blue film cannot climb upwards along the capillary, so that the problem that the electrolyte conducts the shells of a plurality of electric cores and the problem that the shells and the box body are conducted are solved, and the insulation level of the electric box after the electric core is out of control is improved.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 application, and they should be included in the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A battery cell, comprising:

A housing having a receiving cavity;

An electrode assembly disposed within the receiving chamber;

the insulating outer film is coated on at least part of the outer surface of the shell, the insulating outer film comprises a first lap joint part and a second lap joint part, the first lap joint part is attached to the outer surface of the shell, the second lap joint part comprises a coating part attached to the outer surface of the shell, an overlapping part attached to the surface of the first lap joint part, which is opposite to the outer surface of the shell, and a transition part connected between the coating part and the overlapping part, pores are formed by the edges of the transition part, the first lap joint part and the outer surface of the shell,

At least a portion of the outer surface of the housing within the aperture has a first protective layer attached thereto, the first protective layer being impermeable to the electrolyte.

2. The battery cell of claim 1, wherein the aperture extends along a first direction that intersects a horizontal direction, the first protective layer extending upwardly from a bottom end of the aperture along the first direction to a set location.

3. The battery cell of claim 1, wherein at least a portion of the surface of the transition portion within the aperture has a second protective layer attached thereto, the second protective layer being impermeable to electrolyte.

4. The battery cell of claim 3, wherein the aperture extends in a first direction that intersects a horizontal direction, and the second protective layer extends upward from a bottom end of the aperture to a set position along the first direction.

5. The battery cell of claim 1, wherein at least a portion of the surface of the first overlap within the aperture has a third protective layer attached thereto, the third protective layer being impermeable to electrolyte.

6. The battery cell of claim 5, wherein the aperture extends in a first direction that intersects a horizontal direction, and the third protective layer extends upward from a bottom end of the aperture to a set position along the first direction.

7. The battery cell of any one of claims 2, 4, and 6, wherein the set position is spaced from the bottom end of the aperture by no less than one-half of the total length of the aperture in the first direction.

8. The battery cell of any one of claims 2, 4, and 6, wherein the set position is spaced from the bottom end of the aperture by no less than two-thirds of the total length of the aperture in the first direction.

9. The battery cell of any one of claims 2, 4, and 6, wherein the crossover comprises a vertical crossover.

10. The battery cell of any one of claims 1 to 6, wherein the first protective layer is an insulating material.

11. The battery cell of any one of claims 1 to 6, wherein the material of the first protective layer comprises any one of polytetrafluoroethylene, fluororubber, polyvinylidene fluoride, polypropylene, and neoprene.

12. A battery, comprising:

At least one battery cell according to any one of claims 1 to 11.

13. The battery of claim 12, further comprising a battery compartment, wherein the battery cells are disposed within the battery compartment.

14. The battery of claim 13, wherein a heat exchange plate is disposed between the battery cells and the bottom wall of the battery case.

15. An energy storage device comprising the battery cell of any one of claims 1 to 11 or the battery of any one of claims 12 to 14.

16. An electrical device comprising the battery cell of any one of claims 1 to 11 or the battery of any one of claims 12 to 14 for providing electrical energy.