CN220569774U - Battery cell, battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery monomer, battery and power consumption device. The battery cell includes a housing, an insulating member, and a supporting member. The shell is provided with a containing cavity for containing the electrode assembly, and a pressure relief valve is arranged on the shell and is used for breaking to release pressure when the pressure in the containing cavity exceeds a threshold value. The insulating part is arranged on one side of the shell facing the accommodating cavity, and is used for insulating the electrode assembly and the shell, and a pressure release cavity is arranged between the insulating part and the pressure release valve. The support piece protrudes out of one side of the insulating piece, which faces the pressure relief valve, and at least part of the support piece is arranged in the pressure relief cavity. In the battery monomer that this application provided, carry out structural support to the relief valve through setting up support piece, when the inside atmospheric pressure of temperature reduction battery monomer was to the appeal that the relief valve formed, reduced the relief valve and caused ageing risk in advance because of sunken emergence deformation, prolonged relief valve life, improved the stability of battery monomer operation.

Description

Battery cell, battery and electricity utilization device

Technical Field

The present disclosure relates to battery technology, and particularly to a battery cell, a battery, and an electric device.

Background

Batteries are widely used in various electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric tools, etc., and may include cadmium-nickel batteries, hydrogen-nickel batteries, lithium ion batteries, secondary alkaline zinc-manganese batteries, etc.

Currently, a new energy vehicle uses a battery as a power source to supply power to the vehicle. How to improve the safety of the battery cell and ensure the reliability of the battery operation is one of the problems studied in the field.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery, and an electric device, which can improve the safety of the battery cell.

In a first aspect, the present application provides a battery cell including a housing, an insulator, and a support. The shell is provided with a containing cavity for containing the electrode assembly, and a pressure relief valve is arranged on the shell and is used for breaking to release pressure when the pressure in the containing cavity exceeds a threshold value. The insulating part is arranged on one side of the shell facing the accommodating cavity, and is used for insulating the electrode assembly and the shell, and a pressure release cavity is arranged between the insulating part and the pressure release valve. The support piece protrudes out of one side of the insulating piece, which faces the pressure relief valve, and at least part of the support piece is arranged in the pressure relief cavity.

In the technical scheme of this application embodiment, through setting up the shell and providing stable accommodation space for electrode assembly, guarantee electrode assembly's steady operation. The insulating piece is arranged to improve the insulating property between the electrode assembly and the shell, reduce the risk of leakage of the shell and improve the safety of the battery cell. And carry out structural support to the relief valve through setting up support piece, when the temperature reduces the inside atmospheric pressure of battery monomer when the appeal that the relief valve formed, can reduce the probability that the relief valve inwards caves in and takes place to deform, reduce the relief valve and take place the risk that deformation caused ageing in advance because of the sunken, prolonged relief valve life, improved the security and the stability of battery monomer operation.

In some embodiments, the housing includes a shell and an end cap. The shell is provided with an opening, and the end cover covers the opening and encloses the shell together to form a containing cavity. The end cover is provided with a pressure relief hole communicated with the accommodating cavity, and the pressure relief valve is arranged in the pressure relief hole. The insulating part is arranged on one side of the end cover, facing the accommodating cavity, and the surface of the insulating part, facing the pressure relief valve, is inwards concave to form a pressure relief cavity. According to the technical scheme, the pressure relief hole is formed in the end cover, redundant fluid in the accommodating cavity can be timely discharged when the pressure relief valve is started, and the risk of explosion caused by overlarge pressure in the battery cell is reduced. The insulating part is concave towards the surface of relief valve, can make full use of hold the inside space of chamber and set up the pressure release chamber, provide the space for support piece's setting.

In some embodiments, the insulating member is further provided with a plurality of vent holes, the vent holes are used for communicating the pressure release cavity and the accommodating cavity, and at least part of orthographic projection of the vent holes on the end cover overlaps with the pressure release hole. In the structure, through setting up the air vent, communicate pressure release chamber and holding the chamber, can be with holding the gas in the chamber and guide to the pressure release chamber through the air vent in, finally discharge in the follow pressure release hole, improved relief valve relief efficiency.

In some embodiments, the orthographic projection of the support on the end cap falls entirely within the scope of the pressure relief valve. The structure is characterized in that the supporting piece is arranged corresponding to the pressure relief valve, so that the effective supporting area of the supporting piece can be increased, and the supporting stability of the supporting piece to the pressure relief valve is improved.

In some embodiments, the support has a first end face facing the end cap, at least a portion of which abuts the pressure relief valve, and a second end face facing the insulator, at least a portion of which abuts the insulator. In the structure, the two end faces of the supporting piece are respectively abutted with the pressure relief valve and the insulating piece, so that the probability of inward concave deformation of the pressure relief valve can be reduced to the greatest extent, the running stability of the pressure relief valve is improved, and the service life of the pressure relief valve is prolonged.

In some embodiments, the orthographic projection of the support on the end cap is at least one of annular, bar-shaped, or cross-shaped. The structure can form effective support to the pressure release valve, is easy to obtain and has high manufacturing efficiency.

In some embodiments, the number of the supporting members is plural, and the plurality of supporting members are provided at intervals on a surface of the insulating member facing the end cover. In the technical scheme, the plurality of supporting pieces can form a plurality of points of support for the pressure relief valve, so that the concave failure of the pressure relief valve is further reduced.

In some embodiments, the support and insulator are of unitary construction. The structure can improve the manufacturing efficiency of the supporting piece.

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

In a third aspect, the present application provides an electrical device, which includes a battery in the above embodiment, where the battery is used to provide electrical energy.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded view of a battery according to an embodiment of the present application;

fig. 3 is an exploded view of a battery cell according to an embodiment of the present application;

FIG. 4 is a schematic structural view of an end cap assembly according to an embodiment of the present application;

FIG. 5 is a cross-sectional block diagram of an end cap assembly according to one embodiment of the present application;

FIG. 6 is a schematic structural view of an end cap assembly according to another embodiment of the present application;

FIG. 7 is a schematic structural view of an end cap assembly according to yet another embodiment of the present application;

fig. 8 is a schematic structural view of an end cap assembly according to yet another embodiment of the present application.

Detailed description of the reference numerals:

1. a vehicle; 11. an electrode assembly; 2. a battery; 10. an electrode unit; 20. a housing; 21. an opening; 22. a receiving chamber; 24. a pressure release mechanism; 25. an electrode terminal; 26. a pressure release valve; 27. a pressure relief hole; 30. an end cap assembly; 301. an end cap; 302. an insulating member; 303. a support; 304. a pressure relief cavity; 305. a vent hole; 40. a housing; 3. a controller; 4. a motor; 5. a case; 51. a first portion; 52. a second portion; 53. an accommodation space; 7. and (3) a battery cell.

Detailed Description

Embodiments of the technical solutions 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 solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection 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 and claims of the present application and in 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," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present 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 present 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, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

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

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present 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 are to 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 the specific circumstances.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device 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.

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

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application. The vehicle 1 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extending vehicle. The interior of the vehicle 1 is provided with a battery 2, and the battery 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1. The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being arranged to control the battery 2 to power the motor 4, for example for operating power requirements during start-up, navigation and driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, providing driving power for the vehicle 1 instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2, fig. 2 is an exploded view of a battery 2 according to some embodiments of the present application. The battery 2 includes a case 5 and a battery cell 7, and the battery cell 7 is accommodated in the case 5. The case 5 is used for providing an accommodating space for the battery unit 7, and the case 5 may have various structures.

In some alternative embodiments, the case 5 includes a first portion 51 and a second portion 52, the first portion 51 and the second portion 52 being mutually covered, the first portion 51 and the second portion 52 together defining an accommodation space 53 for accommodating the battery cell 7. The second portion 52 may be a hollow structure with one end opened, the first portion 51 may be a plate-shaped structure, and the first portion 51 covers the opening side of the second portion 52, so that the first portion 51 and the second portion 52 together define the accommodating space 53; the first portion 51 and the second portion 52 may be hollow structures each having an opening at one side, and the opening side of the first portion 51 is engaged with the opening side of the second portion 52. Of course, the case 5 formed by the first portion 51 and the second portion 52 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 2, the number of the battery cells 7 may be plural, and the plural battery cells 7 may be connected in series or parallel or in series-parallel, and the series-parallel refers to that the plural battery cells 7 are connected in series or parallel. The battery cells 7 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the battery cells 7 is accommodated in the box 5. Of course, the battery 2 may also be a battery module form formed by connecting a plurality of battery cells 7 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 5. The battery 2 may also include other structures, for example, the battery 2 may also include a bus member for making electrical connection between the plurality of battery cells 7.

Wherein each battery cell 7 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 7 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is a schematic exploded view of a battery cell 7 according to some embodiments of the present disclosure. The battery cell 7 refers to the smallest unit constituting the battery 2. As shown in fig. 3, the battery cell 7 includes a case 40, an electrode assembly 11, and other functional components.

The housing 40 may include an end cap assembly 30 and a shell 20. The end cap assembly 30 refers to a member that is capped at the opening of the case 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap assembly 30 may be adapted to the shape of the housing 20 to mate with the housing 20. Alternatively, the end cap assembly 30 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cap assembly 30 is not easily deformed when being impacted by extrusion, so that the battery cell 7 can have a higher structural strength, and the safety performance can be improved. The end cap assembly 30 may be provided with functional components such as electrode terminals 25. The electrode terminals 25 may be used to be electrically connected with the electrode assembly 11 for outputting or inputting electric power of the battery cells 7.

In some embodiments, the end cap assembly 30 may further be provided with a pressure relief mechanism 24 for relieving the internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold, and the pressure relief mechanism 24 may be a pressure relief valve. The material of the end cap assembly 30 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment.

In some embodiments, insulating members may also be provided on the inside of the end cap assembly 30, which may be used to isolate electrical connection members within the housing from the end cap assembly to reduce the risk of short circuits. By way of example, the insulating member may be plastic, rubber, or the like.

The housing 20 is an assembly for mating with the end cap assembly 30 to form the internal environment of the battery cell 7. Wherein the formed internal environment may be used to house the electrode assembly 11, electrolyte, and other components. The housing 20 and the end cap assembly 30 may be separate components, and an opening 21 may be provided in the housing 20, with the end cap assembly 30 covering the opening at the opening 21 to create the interior environment of the battery cell 7. Without limitation, the end cap assembly 30 and the housing 20 may also be integrated.

Specifically, the end cap assembly 30 and the housing 20 may be formed with a common connection surface prior to insertion of the other components into the housing, and the end cap assembly is then allowed to cover the housing 20 when it is desired to encapsulate the interior of the housing 20. The housing 20 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 20 may be determined according to the specific shape and size of the electrode assembly. The material of the housing 20 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

The electrode assembly 11 is a component in which electrochemical reactions occur in the battery cells 7. One or more electrode assemblies 11 may be contained within the case 20. The plurality of electrode assemblies 11 constitute an electrode unit 10. The electrode assembly 11 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 portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body portion of the electrode assembly 11, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal 25 to form a current loop.

Along with the expansion of the application range of the battery, the application temperature range of the battery monomer is wider, and the operation reliability of the battery monomer in different temperature environments is also more and more emphasized. When the battery cell operates in an environment with a low temperature (below 20 ℃), because the electrolyte in the battery cell is usually injected at room temperature (25-30 ℃) during production, when the battery cell is in a low-temperature environment, the electrolyte and gas in the shell shrink in volume when encountering cold, and negative pressure is generated in the accommodating cavity of the battery cell.

The pressure release valve of the battery monomer is provided with a pressure release film layer, and the pressure release film layer is used for cracking when the internal air pressure exceeds a threshold value. The pressure release rete itself has certain elasticity to the structural strength of pressure release rete is less than the intensity in other regions of casing, consequently when holding the intracavity and producing the negative pressure, the deformation of indent takes place more easily for the pressure release rete. The thickness of partial areas of the pressure release film layer is thinned due to long-term deformation, and the thinned areas are extremely easy to break. When the temperature in the accommodating cavity rises and the volume of the internal substances expands, the pressure release film layer can be broken in advance when the threshold value of the internal air pressure of the battery unit does not reach a preset value.

Based on the above consideration, in order to reduce the risk of advanced aging of the pressure release valve and improve the stability of the operation of the battery cell, the embodiment of the application provides a battery cell. The shell is arranged to provide a stable accommodating space for the electrode assembly, so that stable operation of the electrode assembly is ensured. The insulating piece is arranged to improve the insulating property between the electrode assembly and the shell, reduce the risk of leakage of the shell and improve the safety of the battery cell. And carry out structural support to the relief valve through setting up support piece, when the temperature reduces the inside atmospheric pressure of battery monomer when the appeal that the relief valve formed, can reduce the probability that the relief valve inwards caves in and takes place to deform, reduce the relief valve and take place the risk that deformation caused ageing in advance because of the sunken, prolonged relief valve life, improved the security and the stability of battery monomer operation.

Referring to fig. 3 to 5, fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure. FIG. 4 is a schematic structural view of an end cap assembly according to an embodiment of the present application. FIG. 5 is a cross-sectional block diagram of an end cap assembly according to one embodiment of the present application.

As shown in the drawing, the battery cell 7 provided in the embodiment of the present application includes a housing 40, an insulating member 302, and a supporting member 303. The case 40 is provided with a receiving chamber 22 for receiving the electrode assembly 11, and the case 40 is provided with a relief valve 26, and the relief valve 26 is used to rupture to release the pressure when the pressure in the receiving chamber 22 exceeds a threshold value. The insulating member 302 is disposed on a side of the housing 40 facing the accommodating chamber 22, the insulating member 302 is used for insulating between the electrode assembly 11 and the housing 40, and a pressure release chamber 304 is provided between the insulating member 302 and the pressure release valve 26. The supporting member 303 protrudes from a side of the insulating member 302 facing the pressure release valve 26, and at least a portion of the supporting member 303 is disposed in the pressure release chamber 304.

In the technical solution of the embodiment of the present application, the housing 40 is provided to provide the stable accommodating space 53 for the electrode assembly 11, so as to ensure the stable operation of the electrode assembly 11. Providing the insulating member 302 can improve the insulating performance between the electrode assembly 11 and the case 40, reduce the risk of leakage of the case 40, and improve the safety of the battery cell 7. And, carry out structural support to relief valve 26 through setting up support piece 303, when the temperature reduces the inside atmospheric pressure of battery monomer 7 and when the appeal that relief valve 26 formed, can reduce the probability that relief valve 26 inwards sunken and take place to deform, reduce relief valve 26 and take place the risk that deformation caused ageing in advance because of sunken, prolonged relief valve 26 life, improved the security and the stability of battery monomer 7 operation.

In some embodiments of the present application, the housing 40 includes the shell 20 and the end cap 301. A housing 20 having an opening 21. The end cover 301 is covered on the opening 21 and encloses the housing 20 together to form the accommodating cavity 22, the end cover 301 is provided with a pressure relief hole 27 communicated with the accommodating cavity 22, and the pressure relief valve 26 is arranged in the pressure relief hole 27. Wherein, the insulating member 302 is disposed on one side of the end cover 301 facing the accommodating cavity 22, and the surface of the insulating member 302 facing the pressure release valve 26 is concave inwards to form a pressure release cavity 304.

In the above technical solution, the pressure relief hole 27 is provided on the end cover 301, so that when the pressure relief valve 26 is started, the redundant fluid in the accommodating cavity 22 can be discharged in time, and the risk of explosion caused by overlarge pressure inside the battery cell 7 is reduced. The insulating member 302 is concave toward the surface of the relief valve 26, so that the space inside the accommodating cavity 22 can be fully utilized to provide the relief cavity 304, and space is provided for the support member 303.

In some embodiments of the present application, the insulating member 302 is further provided with a plurality of vent holes 305, where the vent holes 305 are used to communicate with the pressure release chamber 304 and the accommodating chamber 22, and at least a portion of the orthographic projection of the vent holes 305 on the end cover 301 overlaps with the pressure release hole 27. In the above-described structure, the vent hole 305 is provided to communicate the pressure release chamber 304 with the accommodating chamber 22, so that the gas in the accommodating chamber 22 can be guided into the pressure release chamber 304 through the vent hole 305 and finally discharged from the pressure release hole 27, thereby improving the pressure release efficiency of the pressure release valve 26.

In some embodiments of the present application, the orthographic projection of the support 303 onto the end cap 301 falls entirely within the scope of the pressure relief valve 26. In the above structure, the supporting member 303 is disposed corresponding to the relief valve 26, so that the effective supporting area of the supporting member 303 can be increased, and the stability of the supporting member 303 for supporting the relief valve 26 can be improved.

In some embodiments of the present application, the support 303 has a first end face facing the end cap 301, at least a portion of which abuts the pressure relief valve 26, and a second end face facing the insulator 302, at least a portion of which abuts the insulator 302. In the above-described structure, the two end surfaces of the support member 303 are respectively abutted against the relief valve 26 and the insulating member 302, so that the probability of inward concave deformation of the relief valve 26 can be reduced to the greatest extent, the operation stability of the relief valve 26 can be improved, and the service life of the relief valve 26 can be prolonged.

As shown in fig. 6-8, in some embodiments of the present application, the orthographic projection of the support 303 on the end cap 301 is at least one of annular, bar-shaped, or cross-shaped. The above structure can form effective support to the relief valve 26, and is easy to obtain, and the manufacturing efficiency is high.

In some embodiments of the present application, the number of the supporting members 303 is plural, and the plurality of supporting members 303 are disposed at intervals on the surface of the insulating member 302 facing the end cap 301. In the above technical solution, the provision of the plurality of supporting members 303 can form a plurality of points of support for the relief valve 26, so as to further reduce the risk of failure of the recess of the relief valve 26.

In some embodiments of the present application, the support 303 is an integral structure with the insulator 302. Illustratively, the insulator 302 may be plastic, rubber, etc., and the support 303 may be made of plastic, rubber, etc. The integrally formed structure means that the insulator 302 and the support 303 are manufactured and formed in the same mold using the same material. The above structure can improve the manufacturing efficiency of the supporting member 303 and the strength of the connection between the supporting member 303 and the insulating member 302.

An embodiment of the present application provides a battery 2 including the battery cell 7 in any of the embodiments described above. The embodiment of the application also provides an electric device, which comprises the battery 2 in the embodiment, wherein the battery 2 is used for providing electric energy.

The battery 2 and the power utilization device comprise the electric battery unit 7, and the stable accommodating space 53 is provided for the electrode assembly 11 by the outer shell 40 in the battery unit 7, so that the stable operation of the electrode assembly 11 is ensured. Providing the insulating member 302 can improve the insulating performance between the electrode assembly 11 and the case 40, reduce the risk of leakage of the case 40, and improve the safety of the battery cell 7. And, carry out structural support to relief valve 26 through setting up support piece 303, when the inside atmospheric pressure of temperature reduction battery monomer 7 when the suction that forms to relief valve 26, can reduce the probability that relief valve 26 inwards sunken and take place to deform, reduce relief valve 26 and take place the risk that deformation caused ageing in advance because of sunken, prolonged relief valve 26 life, improved the security and the stability of battery monomer 7 operation.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution 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 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 embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery cell (7), characterized by comprising:

a housing (40) provided with a containing cavity (22) for containing the electrode assembly (11), wherein a pressure release valve (26) is arranged on the housing (40), and the pressure release valve (26) is used for being ruptured to release pressure when the pressure in the containing cavity (22) exceeds a threshold value;

an insulating member (302) disposed on a side of the housing (40) facing the accommodating chamber (22), wherein the insulating member (302) is used for insulating the electrode assembly (11) and the housing (40), and a pressure release chamber (304) is formed between the insulating member (302) and the pressure release valve (26);

and the supporting piece (303) protrudes out of one side of the insulating piece (302) facing the pressure relief valve (26), and at least part of the supporting piece (303) is arranged in the pressure relief cavity (304).

2. The battery cell (7) of claim 1, wherein the housing (40) comprises:

a housing (20) having an opening (21);

the end cover (301) is covered on the opening (21) and is enclosed together with the shell (20) to form the accommodating cavity (22), a pressure relief hole (27) communicated with the accommodating cavity (22) is formed in the end cover (301), and the pressure relief valve (26) is arranged in the pressure relief hole (27);

the insulating piece (302) is arranged on one side of the end cover (301) facing the accommodating cavity (22), and the surface of the insulating piece (302) facing the pressure relief valve (26) is concave to form the pressure relief cavity (304).

3. The battery cell (7) according to claim 2, wherein the insulating member (302) is further provided with a plurality of vent holes (305), the vent holes (305) are used for communicating the pressure release cavity (304) and the accommodating cavity (22), and at least a part of orthographic projection of the vent holes (305) on the end cover (301) overlaps with the pressure release hole (27).

4. A battery cell (7) according to claim 3, characterized in that the orthographic projection of the support (303) on the end cap (301) falls entirely within the scope of the pressure relief valve (26).

5. A battery cell (7) according to claim 3, wherein the support (303) has a first end face facing the end cap (301) and a second end face facing the insulator (302), at least part of the first end face being in abutment with the pressure relief valve (26) and at least part of the second end face being in abutment with the insulator (302).

6. The battery cell (7) of claim 4, wherein an orthographic projection of the support (303) on the end cap (301) is at least one of annular, bar-shaped or cross-shaped.

7. The battery cell (7) according to claim 6, wherein the number of the supporting members (303) is plural, and the plurality of supporting members (303) are provided at intervals on the surface of the insulating member (302) facing the end cap (301).

8. The battery cell (7) of any one of claims 1-7, wherein the support (303) is of unitary construction with the insulator (302).

9. A battery (2) characterized by comprising a battery cell (7) according to any of claims 1-8.

10. An electric device, characterized in that it comprises a battery (2) according to claim 9, said battery (2) being intended to supply electric energy.