CN218414807U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, battery and electric device, this battery monomer includes casing, electrode subassembly and end cover. The case has an opening, the electrode assembly is accommodated in the case, and the cap includes a cap body for covering the opening and a cylindrical body connected to the cap body, the cylindrical body surrounding the outside of the case and being connected to the case. In the battery monomer that this application embodiment provided, the end cover includes the lid and connects in the barrel of lid, and the lid is used for covering the opening in order to form the accommodation space who holds electrode subassembly with the casing, and the barrel encircles in the outside of casing and is connected in the casing, when helping the end cover to seal the casing, can also reduce battery monomer because the end cover leads to the emergence of short circuit when sealing the casing to the realization improves battery monomer's security performance, makes battery monomer have good security performance.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a single battery, a battery and an electric device.

Background

Batteries, due to their high energy density, are widely used to provide electrical energy in various fields, such as mobile phones and electric vehicles.

With the development of battery technology, the energy density of the battery has been improved to a certain extent, so that the battery can provide higher endurance mileage for devices in various fields, and the safety performance of the battery is also a problem to be considered along with the improvement of the energy density of the battery. Therefore, how to improve the safety performance of the battery has become a problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application provides a battery monomer, battery and electric device, this battery monomer has good security performance.

In a first aspect, an embodiment of the present application provides a battery cell including a case, an electrode assembly, and an end cap. The case has an opening, the electrode assembly is accommodated in the case, and the cap includes a cap body for covering the opening and a cylindrical body connected to the cap body, the cylindrical body surrounding the outside of the case and being connected to the case.

In the battery monomer that this application embodiment provided, the end cover includes the lid and connects in the barrel of lid, and the lid is used for covering the opening in order to form the accommodation space who holds electrode subassembly with the casing, and the barrel encircles in the outside of casing and is connected in the casing, when helping the end cover to seal the casing, can also reduce battery monomer because the end cover leads to the emergence of short circuit when sealing the casing to the realization improves battery monomer's security performance, makes battery monomer have good security performance.

In some embodiments of the present application, the outer side of the housing has an external thread, the barrel has an internal thread matching the external thread, and the barrel and the housing are connected by the internal thread and the external thread.

In the embodiments described above, the outer side of the housing has an external thread, and the cylinder has an internal thread matching the external thread, which not only enables the housing and the end cap to match to reduce the gap between the end cap and the housing. And when barrel and casing are connected or are dismantled through internal thread and external screw thread, can reduce barrel and casing produced metal fillings and fall into the casing and lead to the emergence of battery monomer short circuit when above-mentioned operation.

In some embodiments of the present application, the cartridge is adhesively attached or welded to the housing.

In the embodiments, the cylinder and the housing may be connected by bonding or welding, which helps the end cap seal the housing, so as to reduce the influence of external factors on the battery cell and reduce the occurrence of air leakage and liquid leakage of the housing.

In some embodiments of the present application, the end cap is made of an insulating material.

In the embodiments, the end cap made of the insulating material can reduce the corrosion of the electrolyte to the end cap, and can prevent the shell from being conducted with the electrode assembly to cause short circuit.

In some embodiments of the present application, the insulating material comprises at least one of a plastic and a resin.

In these embodiments described above, the insulating material includes at least one of plastic and resin, which can help reduce the weight and manufacturing cost of the end cap.

In some embodiments of the present application, the battery cell further includes an insulating film, and the insulating film is wrapped around the housing and the barrel.

In the embodiments, the insulating film covers the case and the cylinder, so that the case and the electrode assembly can be further prevented from conducting and being short-circuited.

In some embodiments of the present application, the housing has an end face surrounding the opening; the battery monomer also comprises a sealing ring which is clamped between the end face and the cover body.

In the embodiments, the sealing ring can help the end cap to seal the casing, so as to further reduce the influence of external factors on the battery cell and reduce the occurrence of air leakage and liquid leakage of the casing.

In some embodiments of the present application, the seal ring is a fluoroelastomer seal ring.

In the embodiments, the fluororubber sealing ring has the advantages of corrosion resistance, aging resistance, high and low temperature resistance, electrolyte resistance and the like, so that the fluororubber sealing ring can be more beneficial to sealing the shell by the end cover.

In some embodiments of the present application, the outer diameter D1 of the seal ring is less than or equal to the inner diameter D2 of the cover, and the inner diameter D1 of the seal ring, the inner diameter D of the end surface, and the outer diameter D satisfy the following relationship: d is not less than D1 and not more than D.

In the embodiments, the sealing ring is sized to facilitate installation and to better seal the end cap to the housing.

In a second aspect, an embodiment of the present application provides a battery, including a battery cell described in any one of the above embodiments. Since the battery includes the battery cell in any of the above embodiments, the battery has the technical effects of the battery cell, and details are not repeated herein.

In a third aspect, an embodiment of the present application provides an electric device, including the battery described in the above embodiments, where the battery is used to provide electric energy.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

Various additional 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. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

fig. 2 illustrates an exploded view of a battery provided by some embodiments of the present application;

fig. 3 is a schematic diagram illustrating a structure of a battery cell provided in some embodiments of the present application;

fig. 4 illustrates an exploded view of a battery cell provided by some embodiments of the present application;

fig. 5 illustrates a schematic structural diagram of a battery cell provided by some embodiments of the present application;

fig. 6 is a schematic diagram illustrating a structure of a battery cell provided in some embodiments of the present application;

fig. 7 is a schematic diagram illustrating a structure of a battery cell according to another embodiment of the present application.

The reference numbers in the detailed description are as follows:

1000-a vehicle;

100-battery, 200-controller, 300-motor;

10-box, 11-first part, 12-second part;

20-a battery cell;

21-housing, 211-opening, 2111-end face, 212-external thread;

22-an electrode assembly;

23-end cap, 231-cover, 232-cylinder, 2321-internal thread;

24-an insulating film;

25-sealing ring.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated in the drawings, are only for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In this application, a battery 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 application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in this application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

A battery formed of a single battery or a plurality of single batteries can provide high voltage, high capacity, and high energy density, and thus is widely used in consumer electronics, power equipment, and the like.

During the assembly of the battery cell, the inventor finds that metal chips are generated when the end cover and the housing are connected or disassembled, and the metal chips may cause short circuit of the battery cell and cause safety problems.

In view of this, the embodiment of the present application provides a battery cell, a battery and an electric device, where the battery cell has good safety performance.

In this application, the electric device may be, but is not limited to, a mobile phone, a tablet, a notebook, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

For convenience of description, the following embodiments are described by taking an electric device as an example of a vehicle according to an embodiment of the present application.

FIG. 1 illustrates a schematic structural diagram of a vehicle provided by some embodiments of the present application.

Referring to fig. 1, a battery 100 is disposed inside a vehicle 1000, and the battery 100 may be disposed 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, and for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Fig. 2 illustrates an exploded view of a battery provided by some embodiments of the present application.

Referring to fig. 2, the battery 100 includes a case 10 and a battery cell 20, and the case 10 is used for accommodating the battery cell 20.

The case 10 is a component for accommodating the battery cell 20, the case 10 provides an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11, a second portion 12, and a third portion 13, and the first portion 11, the second portion 12, and the third portion 13 are covered with each other to define a receiving space for receiving the battery cell 20. The first, second and third portions 11, 12, 13 may be a variety of shapes, such as rectangular parallelepiped, cylindrical, etc. The first portion 11 may be a hollow structure with two open sides, the second portion 12 and the third portion 13 may also be hollow structures with one open side, and the open sides of the second portion 12 and the third portion 13 are covered on the open side of the first portion 11, so as to form the box body 10 with a receiving space. The first portion 11 may have a hollow structure with one side open, the second portion 12 may have a plate-like structure, the third portion 13 may have a plate-like structure, and the second portion 12 and the third portion 13 may be covered on the open side of the first portion 11 to form the box 10 having the receiving space. The first part 11 and the second part 12, the third part 13 may be sealed by a sealing element, which may be a sealing ring, a sealant, etc.

In the battery 100, one or more battery cells 20 may be provided. If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 20 are connected in series or in parallel. A plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 10. Or all the battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 20 is accommodated in the case 10.

Fig. 3 shows a schematic structural diagram of a battery cell provided in some embodiments of the present application. Fig. 4 illustrates an exploded view of a battery cell provided by some embodiments of the present application.

Referring to fig. 3 and 4, the present embodiment provides a battery cell including a case 21, an electrode assembly 22, and an end cap 23. The case 21 has an opening 211, the electrode assembly 22 is accommodated in the case 21, and the cap 23 includes a cap 231 and a cylinder 232 coupled to the cap 231, the cap 231 is used to cover the opening 211, and the cylinder 232 surrounds the outside of the case 21 and is coupled to the case 21.

The housing 21 has a hollow structure with one side opened 211, and may have a hollow structure with both sides opened 211. The end cap 23 covers the opening 211 of the case 21 and is hermetically connected to form a receiving chamber for receiving the electrode assembly 22, the electrolyte, and other components.

The housing 21 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 21 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, it may be selected as the cylindrical case 21; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped case 21 may be used.

One or more electrode assemblies 22 may be provided in the case 21, and the embodiment of the present application is not particularly limited herein.

The electrode assembly 22 is a part in which electrochemical reactions occur in the battery cell 20, and the electrode assembly 22 includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell 20 operates by primarily relying on metal ions to move between the positive and negative pole pieces.

The positive pole piece comprises a positive pole current collector and a positive pole active material layer, wherein the positive pole active material layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active material layer protrudes out of the positive pole current collector which is coated with the positive pole active material layer, and the positive pole current collector which is not coated with the positive pole active material layer is used as a positive pole lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like.

The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together.

The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly 22 may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The end cap 23 is a member that covers the opening 211 of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 23 includes a cap body 231 and a cylinder body 232 connected to the cap body 231, the end cap 23 covers the opening 211 of the case body 21, and the cylinder body 232 surrounds the outside of the case body 21 and is connected to the case body 21, so that the end cap 23 and the case body 21 together define a receiving cavity for receiving the electrode assembly 22, the electrolyte and other components. The shape of the cylinder 232 can be adapted to the shape of the housing 21, for example, the housing 21 has a rectangular parallelepiped structure, the cylinder 232 has a square cylinder structure adapted to the housing 21, and for example, the housing 21 has a cylindrical structure, and the cylinder 232 has a cylindrical structure adapted to the housing 21.

The end cap 23 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc., and the material of the end cap 23 may be the same as or different from that of the housing 21.

The embodiment of the present application does not limit the connection manner of the cylinder 232 and the housing 21. Illustratively, barrel 232 and housing 21 may be connected by welding, snapping, bonding, threading, or other connection means.

In the battery cell 20 provided in the embodiment of the present application, the end cap 23 includes a cap body 231 and a cylinder body 232 connected to the cap body 231, the cap body 231 is used to cover the opening 211 to form a receiving space with the case 21 for receiving the electrode assembly 22, and the cylinder body 232 surrounds the outside of the case 21 and is connected to the case 21, which can help the end cap 23 seal the case 21. In addition, the barrel encircles in the outside of casing and is connected with it, can reduce barrel and casing like this in the risk that the produced metal fillings of in-process fall into the casing, can also reduce battery monomer 20 promptly because end cover 23 leads to the emergence of short circuit when sealed casing 21 to the realization improves battery monomer 20's security performance, makes battery monomer 20 have good security performance.

In some embodiments of the present application, an electrode terminal for electrical connection with the electrode assembly 22 to output electrical energy of the battery cell 20 may be disposed on the cover 231. The electrode terminals may include a positive electrode terminal for electrical connection with a positive tab and a negative electrode terminal for electrical connection with a negative tab. The anode electrode terminal and the anode tab can be directly connected or indirectly connected, and the cathode electrode terminal and the cathode tab can be directly connected or indirectly connected.

Fig. 5 shows a schematic structural diagram of a battery cell provided in some embodiments of the present application.

Referring to fig. 5, in some embodiments of the present application, the housing 21 has an external thread 212 on an outer side thereof, the cylinder 232 has an internal thread 2321 matching the external thread 212, and the cylinder 232 and the housing 21 are connected by the internal thread 2321 and the external thread 212.

In the above embodiments, the outer side of the housing 21 has the external thread 212, and the cylinder 232 has the internal thread 2321 matched with the external thread 212, so that the housing 21 and the end cap 23 can be matched to reduce the gap between the end cap 23 and the housing 21. Furthermore, when the cylinder 232 and the housing 21 are connected or disconnected through the internal thread 2321 and the external thread 212, the occurrence of short circuit of the battery cell 20 caused by metal chips generated during the above operations of the cylinder 232 and the housing 21 falling into the housing 21 can be reduced.

In some embodiments of the present application, the cartridge 232 is adhesively or weld-bonded to the housing 21.

The adhesive connection between the cylinder 232 and the housing 21 can be realized by applying a sealant to the edge of the gap between the cylinder 232 and the housing 21 to seal the gap, so as to prevent external moisture and the like from entering the housing 21 and prevent gas and electrolyte generated in the housing 21 from leaking.

The welding of the cylinder 232 and the shell 21 can be performed by a laser spot welding machine, i.e. the end of the cylinder 232 close to the shell 21 is welded with the shell 21 by the laser spot welding machine, so as to achieve the sealing connection.

In the above embodiments, the cylinder 232 and the housing 21 may be connected by bonding or welding, which helps the end cap 23 seal the housing 21, so as to reduce the influence of external factors on the battery cell 20 and reduce the occurrence of gas and electrolyte leakage from the housing 21.

In other embodiments of the present application, a sealing connection, such as an adhesive or welding connection, may be provided between the housing 21 and the end cap 23 based on the threaded connection between the cylinder 232 and the housing 21, which may further help the end cap 23 seal the housing 21.

In addition, in the embodiment of the present application, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further provided on the cover 231. In the process of pressure relief, part of the electrolyte overflows casing 21 under the action of internal pressure and remains on end cap 23, and the electrolyte on end cap 23 not only corrodes end cap 23, but also may lead to conduction of electrode assembly 22 and casing 21 and short circuit due to metal salt contained in the electrolyte.

Thus, in some embodiments of the present application, the end cap 23 is made of an insulating material. The end cap 23 made of an insulating material can not only reduce corrosion of the electrolyte, but also prevent the case 21 from being electrically connected with the electrode assembly 22 to cause short circuit, thereby improving safety of the battery cell 20.

In other embodiments of the present application, the case 21 may also be made of an insulating material, so that the electrode assembly 22 and the case 21 can be further prevented from being electrically connected to cause short circuit, thereby further improving the safety of the battery cell 20.

In some embodiments of the present application, the insulating material comprises at least one of a plastic layer and a resin layer. These insulating materials can not only help to reduce the weight of the end cap 23 and the case 21 to improve the mass energy density of the battery cell 20, but can also reduce the manufacturing cost of the case 21 and the end cap 23.

Fig. 6 shows a schematic diagram of a battery cell provided in some embodiments of the present application.

Referring to fig. 6, in some embodiments of the present disclosure, the battery cell 20 further includes an insulating film 24, and the insulating film 24 covers the housing 21 and the cylinder 232. The insulating film 24 covers the case 21 and the cylindrical body 232, and can further prevent the case 21 and the electrode assembly 22 from being electrically connected to each other and causing a short circuit.

In the above embodiments, the insulating film 24 may be made of an insulating material such as plastic or resin.

Fig. 7 is a schematic diagram illustrating a structure of a battery cell according to another embodiment of the present application.

Referring to fig. 7, in some embodiments of the present disclosure, the housing 21 has an end surface 2111 surrounding the opening 211, and the battery cell 20 further includes a sealing ring 25 clamped between the end surface 2111 and the cover 231. The sealing ring 25 can help the end cap 23 seal the housing 21 to further reduce the influence of external factors on the battery cell 20 and reduce the occurrence of air leakage and liquid leakage of the housing 21.

In some embodiments of the present application, the seal ring 25 is a fluoroelastomer seal ring. The fluororubber sealing ring has the advantages of corrosion resistance, aging resistance, high and low temperature resistance, electrolyte resistance and the like, so that the fluororubber sealing ring can be more beneficial to the sealing of the end cover 23 and the shell 21.

In some embodiments of the present application, the outer diameter D1 of the sealing ring 25 is less than or equal to the inner diameter D2 of the cover 231, and the inner diameter D1 of the sealing ring 25 and the inner diameter D and the outer diameter D of the end face 2111 satisfy the following relationship: d is more than or equal to D1 and less than or equal to D.

In the embodiments described above, the inner diameter and the outer diameter of the seal ring 25 satisfy the above relationship, and the end cap 23 can be better sealed with the housing 21 while facilitating the installation.

An embodiment of the present application provides a battery, including the battery cell in any one of the above embodiments. Since the battery includes the battery cell in any of the above embodiments, the battery has the technical effects of the battery cell 20, which are not described herein again.

The embodiment of the application provides an electric device which comprises the battery in the embodiment.

According to some embodiments of the present application, the battery cell 20 includes a case 21, an electrode assembly 22, and an end cap 23. The housing 21 has an opening 211, and the housing 21 also has an external thread 212. Electrode assembly 22 is housed in case 21. The end cap 23 includes a cap 231 and a cylinder 232 connected to the cap 231, the cap 231 is used for covering the opening 211, the cylinder 232 has an internal thread 2321 matched with the external thread 212, and the cylinder 232 and the housing 21 are connected through the internal thread 2321 and the external thread 212. This not only enables the housing 21 and the end cap 23 to be mated to reduce the gap between the end cap 23 and the housing 21. When the cylinder 232 and the housing 21 are connected or detached through the internal thread 2321 and the external thread 212, the occurrence of short circuit of the battery cell 20 caused by metal chips generated during the operation of the cylinder 232 and the housing 21 falling into the housing 21 can be reduced, so that the safety performance of the battery cell 20 is improved, and the battery cell 20 has good safety performance.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims (11)

1. A battery cell, comprising:

a housing having an opening;

an electrode assembly housed within the case;

the end cover comprises a cover body and a cylinder body connected to the cover body, the cover body is used for covering the opening, and the cylinder body surrounds the outer side of the shell and is connected to the shell.

2. The battery cell as recited in claim 1 wherein the housing has an external thread on an outside thereof, the barrel has an internal thread matching the external thread, and the barrel and the housing are connected by the internal thread and the external thread.

3. The cell defined in claim 1, wherein the can is adhesively or weld-bonded to the housing.

4. The battery cell of any of claims 1-3, wherein the end cap is made of an insulating material.

5. The battery cell of claim 4, wherein the insulating material comprises at least one of a plastic and a resin.

6. The battery cell as recited in claim 1 further comprising an insulating film that encases the housing and the can.

7. The battery cell as recited in claim 1 wherein the housing has an end face surrounding the opening;

the battery monomer also comprises a sealing ring which is clamped between the end face and the cover body.

8. The battery cell as recited in claim 7 wherein the seal ring is a fluoroelastomer seal ring.

9. The battery cell according to claim 7 or 8, wherein an outer diameter D1 of the sealing ring is smaller than or equal to an inner diameter D2 of the lid body, and the inner diameter D1 of the sealing ring, the inner diameter D of the end face, and the outer diameter D satisfy the following relationship: d is not less than D1 and not more than D.

10. A battery comprising the battery cell of any one of claims 1-9.

11. An electrical device comprising a battery as claimed in claim 10, said battery being adapted to provide electrical energy.

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