CN217361715U

CN217361715U - Battery cell, battery and power consumption device

Info

Publication number: CN217361715U
Application number: CN202221588190.XU
Authority: CN
Inventors: 李莲华; 任苗苗; 杨献伟; 齐晨; 陆阳; 祁少伟; 叶永煌; 靳超; 严观福生
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-09-02
Anticipated expiration: 2032-06-24

Abstract

The application provides a battery monomer, battery and with electric installation, battery monomer include casing, end cover, electrode subassembly, electrolyte and getter member. The shell is provided with a first accommodating cavity and an opening, and the end cover covers the opening. Electrode subassembly, electrolyte and getter member all are located first holding the chamber, and the getter member includes lyophobic ventilative layer and gas adsorption layer, and lyophobic ventilative layer sets up in at least one side surface of gas adsorption layer, and lyophobic ventilative layer is used for separating gas adsorption layer and electrolyte and lyophobic ventilative layer allows gas to permeate through, and lyophobic ventilative layer's thickness D1 is more than or equal to 0.1 mu m and is less than or equal to 1000 mu m. The lyophobic and breathable layer has the characteristic of lyophobic, separates the gas adsorption layer and the electrolyte, and reduces the contact between the gas adsorption layer and the electrolyte, thereby reducing the influence of the electrolyte on the gas adsorption layer, ensuring the adsorption function of the gas adsorption layer, and also ensuring the safety performance of the battery.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

The battery includes a plurality of battery monomer, and the battery is in the use of charge-discharge, and the battery monomer is inside can produce gas, and gas is too much can cause the battery monomer inflation, influences battery safety performance.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, an object of the present application is to provide a battery cell, a battery and a power consumption device, so as to solve the problems in the related art.

An embodiment of a first aspect of the present application provides a battery cell, including: a housing having a first receiving chamber and an opening; the end cover is covered on the opening; an electrode assembly located in the first receiving chamber; the electrolyte is accommodated in the first accommodating cavity; the gas suction component is arranged in the first accommodating cavity and comprises a lyophobic and breathable layer and a gas adsorption layer, the lyophobic and breathable layer is arranged on at least one side surface of the gas adsorption layer and is used for separating the gas adsorption layer from electrolyte, and the lyophobic and breathable layer allows gas to penetrate; wherein the thickness D1 of the lyophobic and breathable layer is more than or equal to 0.1 μm and less than or equal to 1000 μm.

Among the technical scheme of this application embodiment, the component of breathing in absorbs the gas in the battery monomer, reduces the phenomenon of battery monomer inflation, avoids the battery because the safety problem that the inflation causes. The lyophobic and breathable layer has the characteristic of lyophobic, separates the gas adsorption layer and the electrolyte, and reduces the contact between the gas adsorption layer and the electrolyte, thereby reducing the influence of the electrolyte on the gas adsorption layer, ensuring the adsorption function of the gas adsorption layer, and also ensuring the safety performance of the battery. When the thickness D1 of the lyophobic and breathable layer is less than 0.1 μm, a disadvantage of poor lyophobic effect occurs, and the gas adsorption layer cannot be effectively separated from the electrolyte. When the thickness D1 of the lyophobic and breathable layer is greater than 1000 μm, it may increase the overall thickness of the gas absorbing member, thereby failing to provide a compact battery cell. Therefore, the thickness D1 of the lyophobic and breathable layer is more than or equal to 0.1 μm and less than or equal to 1000 μm, so that the electrolyte can be effectively prevented from penetrating through the lyophobic and breathable layer while the air permeability is ensured.

In some embodiments, the getter member is positioned between the electrolyte and the end cap. Thereby making the getter member less likely to come into contact with the electrolyte, reducing the effect of the electrolyte on the getter member.

In some embodiments, the air suction member is disposed on the inner wall of the housing, which can ensure the stability of the air suction member.

In some embodiments, the getter member is disposed on the surface of the end cap facing the electrode assembly, which may further reduce the possibility of contact between the getter member and the electrolyte, thereby further reducing the influence of the electrolyte on the getter member and ensuring the adsorption effect of the getter member.

In some embodiments, the getter member is coated on the end cap; alternatively, the suction member is fixedly mounted on the end cap through a connector. The air suction member is coated on the end cover, so that the air suction member and the end cover can be regarded as a whole, and the air suction member is better in stability. It is more convenient that the component of breathing in passes through connecting piece fixed mounting on the end cover.

In some embodiments, the thickness D2 of the gas adsorption layer is greater than or equal to 0.1 μm and less than or equal to 1000 μm. When the thickness D2 of the gas adsorption layer is less than 0.1 μm, a disadvantage of poor adsorption is exhibited, and when the thickness D2 of the gas adsorption layer is greater than 1000 μm, it increases the overall thickness of the gas suction member, thereby failing to provide a compact battery cell. Thus, by setting the thickness D2 of the gas adsorption layer to 0.1 μm or more and 1000 μm or less, the size of the getter member is reduced while gas adsorption is ensured.

In some embodiments, the lyophobic breathable layer has a plurality of gas-permeable pores therein, the plurality of gas-permeable pores having a pore diameter greater than or equal to 2 a and less than or equal to 6 a. The air holes in the lyophobic and breathable layer enable air in the battery monomer to penetrate through the lyophobic and breathable layer to enter the air absorption layer to be absorbed. Limiting the pore diameter of the gas vent to be greater than or equal to 2 a and less than or equal to 6 a can allow gas molecules to penetrate through the lyophobic and gas permeable layer, and can prevent liquid molecules in the electrolyte from penetrating through the lyophobic and gas permeable layer to the greatest extent, which interferes with the gas adsorption layer and affects the adsorption effect of the gas adsorption layer.

In some embodiments, the static contact angle of the lyophobic and breathable layer is greater than 90 °, so that the surface of the lyophobic and breathable layer is difficult to be wetted by liquid and shows lyophobic property, thereby effectively separating the electrolyte and the gas adsorption layer.

In some embodiments, the roll angle of the lyophobic breathable layer is less than 10 ° such that the lyophobic breathable layer may exhibit self-cleaning properties, i.e. the liquid cannot wet the surface of the lyophobic breathable layer, but also roll away from the surface of the lyophobic breathable layer, exhibiting lyophobic properties, thereby effectively separating the electrolyte from the gas adsorbing layer.

In some embodiments, the gas adsorption layer is configured to chemically react with a gas. The gas adsorption layer chemically reacts with gas in the battery cell, so that the gas in the battery cell is adsorbed. And the gas adsorption layer and the gas in the battery monomer are subjected to chemical reaction, so that the gas can not be separated out from the gas suction component, and the effect is better.

In some embodiments, the material from which the gas adsorption layer is made is a mixture comprising a hydroxide and a strong base and a weak acid salt. The gas generated in the battery monomer is mainly carbon dioxide, and the mixture of the hydroxide and the strong base weak acid salt can react with the carbon dioxide to realize the adsorption effect of the gas adsorption layer.

In some embodiments, the mixture from which the gas adsorption layer is prepared further comprises an oxidizing agent. The gas that produces among the battery monomer is carbon monoxide except that carbon dioxide, and the oxidant can be with carbon monoxide oxidation to carbon dioxide for carbon monoxide and carbon dioxide can be adsorbed simultaneously to the gas adsorption layer, strengthen the adsorption effect on gas adsorption layer.

In some embodiments, the gas adsorption layer is used to adsorb gas by physical adsorption. The gas adsorption layer adsorbs gas in the battery cell into the gas adsorption layer, so that the gas in the battery cell is adsorbed.

In some embodiments, the material from which the gas adsorption layer is made comprises at least one of a nanoporous carbon material, a metal-organic framework, a zeolite, a porous organic polymer, and a porous silica. These materials are all materials with better adsorptivity, and can realize the effect of gas adsorption of the gas adsorption layer.

In some embodiments, the gas adsorption layer has a plurality of adsorption pores having a pore diameter greater than or equal to 3 a and less than or equal to 10 a. The gas adsorption layer is provided with a plurality of adsorption holes, and gas in the battery monomer enters the gas adsorption layer and then enters the adsorption holes. And the aperture of the adsorption hole can ensure the adsorption effect of the gas adsorption layer in the range.

In some embodiments, the gas adsorption layer has a specific surface area greater than or equal to 100m ² (ii) 3000m or less per gram ² And/g, thereby obtaining a gas adsorbent having a strong gas adsorption property and an excellent mechanical strength.

In some embodiments, the gas adsorbing layer has a gas adsorbing capacity of greater than 15 mL/g. The gas adsorption capacity of the gas adsorption layer is larger, the adsorption performance is better, the gas adsorption layer can adsorb the gas in the single battery, and the influence of the gas on the safety performance of the single battery is avoided.

In some embodiments, the getter member comprises two lyophobic and breathable layers, respectively on opposite surfaces of the gas adsorption layer; or the two opposite surfaces and each side surface of the gas adsorption layer are provided with lyophobic and breathable layers, wherein the side surface is positioned between the two opposite surfaces; or the air suction component comprises a lyophobic and breathable layer, and the lyophobic and breathable layer is positioned on one side surface of the gas adsorption layer; or, one side surface and each side surface of the gas adsorption layer are provided with a lyophobic and breathable layer. When the air suction member comprises a lyophobic and breathable layer, the air suction member occupies a small volume, and the influence on the energy density of a battery cell of the battery is avoided. When the suction element includes the ventilative layer of two-layer lyophobic, the ventilative layer of two-layer lyophobic can be followed the relative two surfaces of gas adsorption layer and protected gas adsorption layer, further reduces the influence of electrolyte to gas adsorption layer, guarantees suction element's adsorptivity. The relative two surfaces and each side of gas adsorption layer all are provided with the ventilative layer of lyophobic, and gas adsorption layer is covered by the ventilative layer of lyophobic, and the ventilative layer of lyophobic is better to gas adsorption layer's protection effect. One side surface and each side of gas adsorption layer all are provided with the ventilative layer of lyophobic, have both guaranteed the protection effect of the ventilative layer of lyophobic to gas adsorption layer, make the volume that the component of breathing in occupies less again.

In some embodiments, the ratio between the amount of total material of the gas adsorption layer and the capacity of the battery cell is greater than or equal to 4 × 10 ^-5 mol/Ah of 8X 10 or less ^-4 mol/Ah. The ratio of the total substance quantity of the gas adsorption layer to the capacity of the battery monomer is limited in the range, so that the gas adsorption layer can completely adsorb the gas in the battery monomer, and the energy density of the battery monomer is prevented from being influenced by too much gas adsorption layer.

Embodiments of a second aspect of the present application provide a battery including the battery cell of the above embodiments.

Embodiments of the third aspect of the present application provide an electric device, which includes the battery in the above embodiments, and the battery is used for providing electric energy.

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

Drawings

In the drawings, like reference characters designate like or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are therefore not to be considered limiting of its scope.

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

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

fig. 4 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

fig. 5 is a schematic structural diagram of a battery cell according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of a battery cell according to another embodiment of the present application;

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

fig. 8 is a schematic structural diagram of a battery cell according to another embodiment of the present application.

Description of the reference numerals:

1000. a vehicle;

100. a battery; 200. a controller; 300. a motor;

110. a box body; 111. a first portion; 112. a second portion;

120. a battery cell; 10. a housing; 20. an end cap; 201. an electrode terminal; 202. a pressure relief mechanism; 203. plastic is discharged; 30. an electrode assembly; 301. a tab; 40. a suction member; 401. a lyophobic breathable layer; 402. a gas adsorption layer; 50. an insulating shell.

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 above figures 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 implicitly indicating 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), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, 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 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 integrated; 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.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The applicant has noticed that as the charge-discharge cycle of the battery progresses, gas is generated inside the battery cell to cause the battery cell to swell, thereby causing an increase in battery impedance and a reduction in life. With respect to the lithium secondary battery, when the lithium secondary battery exhibits abnormal operation conditions such as internal short-circuit, overcharge, exposure to high temperature, etc. after final sealing, the electrolyte therein is decomposed to generate gas. The generated gas may cause deformation of the battery case and shorten the cycle life of the battery, and in severe cases, may cause ignition or explosion of the battery.

For example, in the automotive field, ternary nickel-cobalt-manganese (NCM) has a high energy density and is widely used in positive electrode materials. However, the positive electrode potential of NCM as a positive electrode material is high, and the nonaqueous solvent in the electrolyte is easily decomposed in a working environment, and much gas is generated.

In order to alleviate the safety problem of the battery cell caused by excessive internal gas, the applicant has conducted extensive research and has designed a battery cell, in which the gas absorbing member in the battery cell includes a liquid-repellent gas-permeable layer and a gas adsorbing layer, the gas adsorbing layer is used for adsorbing gas, and the liquid-repellent gas-permeable layer is used for separating the gas adsorbing layer from the electrolyte. The applicant researches and discovers that a gas adsorption layer arranged in a cavity of a battery cell inevitably contacts with an electrolyte, and the gas adsorption layer reacts with the electrolyte after contacting with the electrolyte, and particularly when a porous material is used as a material of the gas adsorption layer, the interior of the material is filled with the electrolyte, so that the adsorption capacity of the gas adsorption layer is influenced, and the safety performance of the battery is influenced. This application can avoid gas adsorption layer and electrolyte contact through setting up the ventilative layer of lyophobic, guarantees gas adsorption layer's adsorption efficiency, and gas permeation lyophobic ventilative layer can be adsorbed by gas adsorption layer, promotes the security performance of battery.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system who possesses this electric installation of constitution such as battery monomer, battery that this application disclosed can be used, like this, is favorable to alleviating and automatically regulated battery monomer bulging force worsens, and supplementary electrolyte consumes, promotes the stability and the battery life-span of battery performance.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric 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 automobile, 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, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. 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 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.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 110 and a battery cell 120, and the battery cell 120 is accommodated in the case 110. The case 110 is used to provide a receiving space for the battery cells 120, and the case 110 may have various structures. In some embodiments, the case 110 may include a first portion 111 and a second portion 112, the first portion 111 and the second portion 112 cover each other, and the first portion 111 and the second portion 112 together define a receiving space for receiving the battery cell 120. The second part 112 may be a hollow structure with an open end, the first part 111 may be a plate-shaped structure, and the first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 define an accommodating space together; the first portion 111 and the second portion 112 may be both hollow structures with one side open, and the open side of the first portion 111 covers the open side of the second portion 112. Of course, the case 110 formed by the first portion 111 and the second portion 112 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, there may be a plurality of battery cells 120, and the plurality of battery cells 120 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 120. The plurality of battery cells 120 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 120 is accommodated in the box body 110; of course, the battery 100 may also be formed by connecting a plurality of battery cells 120 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 110. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 120.

Each battery cell 120 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 120 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is a schematic exploded view of a battery cell according to some embodiments of the present disclosure. The battery cell 120 includes a case 10, an end cap 20, an electrode assembly 30, an electrolyte, and a gas suction member 40. The case 10 has a first receiving chamber in which the electrode assembly 30, the electrolyte and the getter member 40 are located, and an opening to which the cap 20 is fitted.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a battery cell according to some embodiments of the present disclosure. The getter member 40 includes a lyophobic and breathable layer 401 and a gas adsorption layer 402, the lyophobic and breathable layer 401 is disposed on at least one side surface of the gas adsorption layer 402, the lyophobic and breathable layer 401 is used for separating the gas adsorption layer 402 and an electrolyte and the lyophobic and breathable layer 401 allows gas to permeate therethrough, wherein a thickness D1 of the lyophobic and breathable layer 401 is greater than or equal to 0.1 μm and less than or equal to 1000 μm.

The case 10 is an assembly for cooperating with the end cap 20 to form an internal environment (i.e., a first receiving cavity) of the battery cell 120, wherein the first receiving cavity may be used to receive the electrode assembly 30, an electrolyte, and other components. The housing 10 and the end cap 20 may be separate components, and an opening may be formed in the housing 10, and the opening may be covered by the end cap 20 to form the internal environment of the battery cell 120. Without limitation, the end cap 20 and the housing 10 may be integrated, and specifically, the end cap 20 and the housing 10 may form a common connecting surface before other components are inserted into the housing, and when it is required to enclose the inside of the housing 10, the end cap 20 covers the housing 10. The housing 10 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the case 10 may be determined according to the specific shape and size of the electrode assembly 30. The material of the housing 10 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The end cap 20 refers to a member that covers the opening of the case 10 to insulate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 20 may be adapted to the shape of the housing 10 to fit the housing 10. Alternatively, the end cap 20 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 20 is not easily deformed when being extruded and collided, and the single battery 120 may have a higher structural strength and improved safety performance. The end cap 20 may be provided with functional components such as the electrode terminal 201. The electrode terminal 201 may be used to electrically connect with the electrode assembly 30 for outputting or inputting electric energy of the battery cell 120. In some embodiments, a pressure relief mechanism 202 for relieving the internal pressure of the battery cell 120 when the internal pressure or temperature reaches a threshold value may also be disposed on the end cap 20. The material of the end cap 20 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention. In some embodiments, insulation may also be provided on the inside of the end cap 20, which may be used to isolate the electrical connections within the housing 10 from the end cap 20 to reduce the risk of shorting. Illustratively, the insulator may be plastic, rubber, or the like.

The electrode assembly 30 is a part in which electrochemical reactions occur in the battery cell 120. One or more electrode assemblies 30 may be contained within the case 10. The electrode assembly 30 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the body portion of the battery cell assembly, and the portions of the positive and negative electrode sheets having no active material each constitute a tab 301. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery, the positive and negative active materials react with the electrolyte, and the tab 301 is connected to the electrode terminal to form a current loop.

The gas generated by the battery cells is substantially all located in the first cavity, and the getter member 40 is also located in the first cavity and can absorb the gas located in the first cavity.

In the embodiment of the present application, the getter member 40 is disposed in the battery cell 120 to absorb the gas in the battery cell 120, so as to reduce the swelling phenomenon of the battery cell and avoid the safety problem of the battery caused by the swelling. The lyophobic and breathable layer 401 has the characteristics of lyophobic, the electrolyte is liquid, the lyophobic and breathable layer 401 can separate the gas adsorption layer 402 from the electrolyte, and the contact between the gas adsorption layer 402 and the electrolyte is reduced, so that the influence of the electrolyte on the gas adsorption layer 402 is reduced, the adsorption function of the gas adsorption layer 402 is ensured, and the safety performance of the battery is also ensured. When the thickness D1 of the lyophobic and breathable layer 401 is less than 0.1 μm, a disadvantage of poor lyophobic effect occurs, and the gas adsorption layer 402 cannot be effectively separated from the electrolyte. When the thickness D1 of the lyophobic-breathable layer 401 is greater than 1000 μm, it may increase the overall thickness of the gas suction member 40, thereby failing to provide a compact battery cell. Thus, by setting the thickness D1 of the lyophobic and breathable layer 401 to be 0.1 μm or more and 1000 μm or less, the permeation of the electrolyte solution through the lyophobic and breathable layer 401 can be effectively blocked while the air permeability is ensured.

For example, the thickness D1 of the lyophobic and breathable layer 401 is 0.1 μm, the thickness D1 of the lyophobic and breathable layer 401 is 1 μm, the thickness D1 of the lyophobic and breathable layer 401 is 10 μm, the thickness D1 of the lyophobic and breathable layer 401 is 200 μm, the thickness D1 of the lyophobic and breathable layer 401 is 500 μm, or the thickness D1 of the lyophobic and breathable layer 401 is 1000 μm.

Preferably, the thickness D1 of lyophobic and breathable layer 401 is greater than or equal to 0.5 μm and less than or equal to 500 μm.

According to some embodiments of the present application, a getter member 40 is located between the electrolyte and the end cap 20. That is, the suction member 40 is located at a side of the first cavity of the case 10 close to the end cap 20.

In the embodiment of the present application, the electrolyte is flowing, the position of the electrolyte is not fixed, and the gas suction member 40 is located between the electrolyte and the end cap 20, which means that the gas suction member 40 is located between the electrolyte and the end cap 20 in at least one state. For example, when the battery cell 120 is placed right, the opening of the case 10 faces upward, and the gas suction member 40 is located between the electrolyte and the end cap 20. The battery cell 120 may be positive when the battery cell is in the operating state.

Illustratively, the cell 120 is right side up, meaning that the end cap 20 is placed upward. As shown in fig. 4, when the battery cell 120 is placed, the gas suction member 40 is positioned between the liquid level line a of the electrolyte and the end cap 20.

In the present embodiment, gas is evolved from the electrolyte and generally enters a space without electrolyte (generally referred to as a residual space), and the getter member 40 is located between the electrolyte and the end cap 20, so that the getter member 40 is less likely to come into contact with the electrolyte, and the influence of the electrolyte on the getter member 40 is reduced.

In one implementation of the embodiment of the present application, fig. 5 is a schematic structural diagram of a battery cell provided in other embodiments of the present application, and referring to fig. 5, a getter member 40 is disposed on an inner wall of a housing 10. That is, the suction member 40 is provided on the inner wall of the case 10 and on a side of the inner wall adjacent to the end cap 20.

In the embodiment of the present application, the suction member 40 may be disposed on any one of the inner walls of the case 10. Wherein the lyophobic and breathable layer 401 is disposed on the surface of the gas adsorption layer 402 on one side far away from the inner wall of the housing 10, so that the lyophobic and breathable layer 401 separates the gas adsorption layer 402 from the electrolyte.

In the embodiment of the present application, the air suction member 40 is disposed on the inner wall of the housing 10, and the stability of the air suction member 40 can be ensured.

Referring to fig. 3, the battery cell 120 further includes an insulating case 50, the battery cell 120 is installed in the insulating case 50 to avoid contact with the housing 10, after the electrolyte is injected into the battery cell 120, the electrolyte is mainly adsorbed by the bare cell, and most of the electrolyte exists in the insulating case 50. The bottom of the insulating case 50 is opened, and a small amount of electrolyte flows into the gap between the case 10 and the bottom of the insulating case 50 through the opening at the bottom of the insulating case 50, and at this time, no electrolyte exists in the middle upper portion of the gap between the insulating case 50 and the case 10, so it is preferable that the suction member 40 can be placed at the middle upper position of the gap between the insulating case 50 and the case 10.

According to other embodiments of the present application, as shown in fig. 4, the gas suction member 40 is disposed on a surface of the end cap 20 facing the electrode assembly 30.

In the present embodiment, the surface of the end cap 20 facing the electrode assembly 30 is located in the first cavity, and this surface may be referred to as an inner side surface, and when the battery cell is placed right side, the position of the inner side surface is the highest position in the entire first cavity. The suction member 40 is located at the highest position in the first cavity when the battery cell 120 is placed upright.

When the air suction member 40 is placed on the inner surface of the end cap 20, the position of the mechanical key inside the battery is considered, so as to avoid the interference between the end cap 20 and the mechanical key, wherein the mechanical key includes but is not limited to the tab 301, the lower plastic 203 inside the end cap 20, the electrode terminal 201, the pressure relief mechanism 202, and the like.

In the embodiment of the present application, the air suction member 40 is fixed on the inner side surface of the end cap 20, so that the possibility that the air suction member 40 contacts the electrolyte can be further reduced, the influence of the electrolyte on the air suction member 40 can be further reduced, and the adsorption effect of the air suction member 40 is ensured.

In some embodiments of the present application, the getter member 40 is coated on the end cap 20.

In other embodiments of the present application, the getter member 40 is fixedly mounted to the end cap 20 by a connector.

In the embodiment of the present application, after the end cap 20 is manufactured, a gas absorption layer 402 is coated on the inner surface of the end cap 20, and then a lyophobic and breathable layer 401 is coated on the gas absorption layer 402 to form the whole getter member 40.

In the embodiment of the present application, the connection member may be a bonding adhesive layer, for example, after the getter member 40 is manufactured, the gas adsorption layer 402 is bonded to the inner side surface of the end cap 20 by the bonding adhesive.

The getter member 40 is coated on the end cap 20, so that the getter member 40 and the end cap 20 can be regarded as one body, and the getter member 40 has better stability.

It is more convenient that the air sucking member 40 is fixedly mounted on the end cap 20 by means of a connector.

In one embodiment of the present application, the lyophobic and breathable layer 401 may be made of a material having a low surface energy, and the manufacturing method is relatively simple. Wherein the ultralyophobic surface requires a sufficiently low surface energy and a rough structure capable of trapping air.

Illustratively, the material for preparing the lyophobic and breathable layer 401 may include fluorocarbon compounds such as polytetrafluoroethylene and polyvinylidene fluoride, organic hydrocarbon compounds such as polystyrene and polypropylene, organic silicon compounds such as Polydimethylsiloxane (PDMS), and inorganic materials such as carbon materials and metal oxides. For example, the lyophobic and breathable layer 401 may be prepared from organic hydrocarbons, and has good stability, no fluorine, environmental friendliness, and low cost.

In another embodiment of the present application, the originally hydrophilic surface may be obtained by modification of a low surface energy substance (also referred to as structuring of surface roughness), for example, by coating the surface of an originally hydrophilic material with a low surface energy material. The commonly used low surface energy modifier mainly comprises siloxane or thiol containing long chain alkyl or fluorinated alkyl, fatty acid, aromatic azide, etc. The method modifies the surface, so that the original lyophilic material can be used for preparing the super lyophobic surface, and the selection range of the raw materials of the lyophobic and breathable layer 401 is widened.

Illustratively, the surface roughness is constructed in two ways, top-down and bottom-up.

For example, the bottom-up method comprises a sol-gel method, a solvothermal method, a layer-by-layer self-assembly method, an electrochemical method, a template method, a spraying method, an electrostatic spinning method and the like, a rough structure is constructed in a manner of material surface deposition and the like from bottom to top, and the method is flexible and simple to operate and is suitable for preparation under various conditions. The solvent thermal method and the spraying method can be selected, the solvent thermal method is simple and convenient to operate, the spraying method is mature when being applied in the field of paint industry, and meanwhile, the solvent thermal method is simple and convenient to operate, low in cost and strong in applicability.

For example, the top-down method includes a chemical etching method, an ion etching method, and the like.

According to some embodiments of the present application, the thickness D2 of the gas adsorption layer 402 is greater than or equal to 0.1 μm and less than or equal to 1000 μm.

For example. The thickness D2 of the gas adsorption layer 402 is 0.1 μm, the thickness D2 of the gas adsorption layer 402 is 1 μm, the thickness D2 of the gas adsorption layer 402 is 10 μm, the thickness D2 of the gas adsorption layer 402 is 200 μm, the thickness D2 of the gas adsorption layer 402 is 500 μm, or the thickness D2 of the gas adsorption layer 402 is 1000 μm.

Preferably, the thickness D2 of the gas adsorption layer 402 may be greater than or equal to 0.5 μm and less than or equal to 500 μm.

In other implementations, the thickness D2 of the gas adsorption layer 402 may have other values, which is not limited in this application.

In the embodiment of the present application, the gas adsorption layer 402 having a thickness D2 of less than 0.1 μm may exhibit a disadvantage of poor adsorption, and when the gas adsorption layer 402 having a thickness D2 of more than 1000 μm may increase the overall thickness of the gas suction member 40, thereby failing to provide a compact battery cell. Thus, by setting the thickness D2 of the gas adsorption layer 402 to 0.1 μm or more and 1000 μm or less, the size of the suction member is reduced while gas adsorption is ensured.

According to some embodiments of the present application, the lyophobic breathable layer 401 has a plurality of gas permeable pores therein, the pore diameter of the plurality of gas permeable pores being greater than or equal to 2 a and less than or equal to 6 a.

For example, the pore diameter of the gas vent is 2A, or the pore diameter of the gas vent is 3A, or the pore diameter of the gas vent is 4A, or the pore diameter of the gas vent is 5A, or the pore diameter of the gas vent is 6A.

Preferably, the pore diameter of the plurality of pores is greater than or equal to 2A and less than or equal to 3A.

In the embodiment of the present disclosure, the gas permeable holes in the lyophobic and gas permeable layer 401 enable gas in the battery cell to permeate through the lyophobic and gas permeable layer 401 into the gas adsorption layer 402 to be absorbed. Defining the pore diameters of the gas permeable pores to be greater than or equal to 2 a and less than or equal to 6 a may allow gas molecules to penetrate through the lyophobic-gas permeable layer 401, and may maximally prevent liquid molecules in the electrolyte from penetrating through the lyophobic-gas permeable layer 401, causing interference with the gas adsorption layer 402, affecting the adsorption effect of the gas adsorption layer 402.

According to some embodiments of the present application, the static contact angle of the lyophobic breathable layer 401 is greater than 90 °.

When the liquid reaches equilibrium on the surface of the solid, the angle between the boundary between the gas and liquid and the boundary between the liquid and solid is called the contact angle, which is the static contact angle. The lyophilic and lyophobic degree of the material can be directly judged from the value of the static contact angle, and the lyophobic degree is higher when the static contact angle is larger. The electrolyte can be classified into an aqueous electrolyte, an organic electrolyte, an ionic liquid, and the like. The lyophobicity of the lyophobic and breathable layer 401 with respect to the electrolyte solution can be determined according to the magnitude of the static contact angle of the liquid on the surface of the lyophobic and breathable layer 401. The static contact angle can be measured by a contact angle measuring instrument.

For example, the static contact angle of the lyophobic and breathable layer 401 is 91 °, or the static contact angle of the lyophobic and breathable layer 401 is 100 °, or the static contact angle of the lyophobic and breathable layer 401 is 120 °, or the static contact angle of the lyophobic and breathable layer 401 is 150 °, or the static contact angle of the lyophobic and breathable layer 401 is 160 °.

Preferably, the static contact angle of the lyophobic breathable layer 401 is greater than 150 °.

In other implementations, the static contact angle of the lyophobic and breathable layer 401 may have other values, which are not limited in this application.

In the embodiment of the present application, when the static contact angle of the lyophobic and breathable layer 401 is greater than 90 °, the surface of the lyophobic and breathable layer 401 is less prone to be wetted by liquid, and lyophobic property is exhibited, so that the electrolyte and the gas absorption layer 402 are effectively separated.

According to some embodiments of the present application, the roll angle of the liquid-repellent gas-permeable layer 401 is less than 10 °.

The roll angle is the critical angle that the inclined surface makes with the horizontal plane just as the droplet rolls on the inclined surface. The roll angle can be measured by a contact angle measuring instrument.

For example, the roll angle of the lyophobic and breathable layer 401 is 9 °, or the roll angle of the lyophobic and breathable layer 401 is 5 °, or the roll angle of the lyophobic and breathable layer 401 is 3 °, or the roll angle of the lyophobic and breathable layer 401 is 1 °.

Preferably, the roll angle of the lyophobic breathable layer 401 is less than 5 °.

In other implementations, the roll angle of the lyophobic and breathable layer 401 may be other values, which is not limited in this application.

In the embodiment of the present application, the rolling angle of the lyophobic and breathable layer 401 is less than 10 °, so that the lyophobic and breathable layer 401 can exhibit self-cleaning property, that is, the liquid cannot wet the surface of the lyophobic and breathable layer 401, and can roll away from the surface of the lyophobic and breathable layer 401 to exhibit lyophobic property, thereby effectively separating the electrolyte from the gas adsorption layer 402.

According to some embodiments of the present application, gas adsorbing layer 402 is configured to chemically react with a gas.

In the embodiment of the present application, the gas adsorption layer 402 chemically reacts with the gas in the battery cell, thereby adsorbing the gas in the battery cell. And the gas adsorption layer 402 and the gas in the battery cell are subjected to chemical reaction, so that the gas can not be separated out from the gas suction member 40, and the effect is better.

According to some embodiments of the present application, the material from which gas adsorbing layer 402 is made is a mixture comprising a hydroxide and a strong base, a weak acid salt.

In embodiments herein, the hydroxide comprises an alkali metal hydroxide and/or an alkaline earth metal hydroxide.

Illustratively, the hydroxide is at least one of lithium hydroxide, sodium hydroxide, calcium hydroxide, potassium hydroxide, magnesium hydroxide, and barium hydroxide.

Illustratively, the strong base weak acid salt is at least one of sodium metaaluminate, potassium metaaluminate, magnesium metaaluminate, calcium metaaluminate, sodium acetate and potassium acetate.

In other implementations, the hydroxide may be other substances, and the strong base and the weak acid salt may also be other substances, which is not limited in this application.

In the embodiment of the present application, the gas generated in the battery cell is mainly carbon dioxide (CO) ₂ ) Mixtures of hydroxides and strong bases and weak acid salts with CO ₂ The reaction occurs to achieve the adsorption effect of the gas adsorption layer 402.

According to some embodiments of the present application, the mixture from which the gas adsorption layer 402 is prepared further includes an oxidizing agent.

In the present embodiment, the oxidizing agent includes a halide.

Illustratively, the halide is at least one of cupric chloride, cuprous chloride, cupric bromide, cuprous bromide, cupric iodide, cuprous iodide, silver chloride, ferric chloride, ferrous chloride, nickel chloride, palladium chloride, and zinc chloride.

In other implementations, the oxidizing agent may be another substance, and the application is not limited in this regard.

In the embodiment of the present application, the gas generated in the battery cell is other than CO ₂ And carbon monoxide (CO), which can be oxidized to CO2 by the oxidant, so that the gas adsorption layer 402 can adsorb CO and CO simultaneously ₂ The adsorption effect of the gas adsorption layer 402 is enhanced.

According to some embodiments of the present application, gas adsorbing layer 402 is used to adsorb gas by physical adsorption.

In the embodiment of the present application, the gas adsorption layer 402 adsorbs the gas in the battery cell in the gas adsorption layer 402, thereby adsorbing the gas in the battery cell.

According to some embodiments of the present application, the material from which the gas adsorption layer 402 is made includes at least one of nanoporous carbon materials, metal-organic frameworks (MOFs), zeolites, Porous Organic Polymers (POPs), and porous silica.

Illustratively, the material of the gas adsorption layer 402 includes any one of a nanoporous carbon material, a metal-organic framework, a zeolite, a porous organic polymer, and a porous silica, or a mixture of any two of the materials, or a mixture of any plurality of the materials.

In other implementations, the material of the gas adsorption layer 402 can also be other adsorptive materials.

In the embodiment of the present application, the nanoporous carbon material, the metal-organic framework, the zeolite, the porous organic polymer, and the porous silica are all materials with good adsorptivity, and the effect of adsorbing gas by the gas adsorption layer 402 can be achieved.

In accordance with some embodiments of the present application, gas-adsorbing layer 402 has a plurality of adsorption pores having a pore diameter greater than or equal to 3 a and less than or equal to 10 a.

Illustratively, the pore diameter of the adsorption pores is 3 a, or the pore diameter of the gas-permeable pores is 4 a, or the pore diameter of the gas-permeable pores is 6 a, or the pore diameter of the gas-permeable pores is 8 a, or the pore diameter of the gas-permeable pores is 10 a.

Illustratively, the adsorption holes exist on the entire surface of the gas adsorption layer 402, ensuring the adsorption effect of the gas adsorption layer.

In the embodiment of the present application, the gas adsorption layer 402 has a plurality of adsorption holes, and the gas in the battery cell enters the gas adsorption layer 402 and then enters the adsorption holes. The pore diameter of the adsorption pores is greater than or equal to 3 a and less than or equal to 10 a, which can ensure the adsorption effect of the gas adsorption layer 402.

Ratio table of gas adsorption layer 402 according to some embodiments of the present applicationArea greater than or equal to 100m ² A ratio of/g to 3000m or less ² /g。

The specific surface area refers to the total area of the unit mass of the material, and can be used for characterizing the adsorbability of the material. The specific surface area can be measured and calculated by a specific surface area and porosity analyzer.

For example, the specific surface area of the gas adsorption layer 402 is 100m ² In terms of a/g ratio, or the specific surface area of the gas adsorption layer 402 is 500m ² In terms of a/g, or a specific surface area of the gas adsorption layer 402 of 1000m ² G, or the specific surface area of the gas adsorption layer 402 is 2000m ² (ii)/g, or the specific surface area of the gas adsorption layer 402 is 3000m ² /g。

In the present embodiment, the specific surface area of the gas adsorption layer 402 is 100m ² G to 3000m ² And/g, a gas adsorbent having a high gas adsorption property and an excellent mechanical strength can be obtained.

According to some embodiments of the present application, the gas adsorbing capacity of the gas adsorbing layer 402 is more than 15 mL/g.

For example, the gas adsorption amount of the gas adsorption layer 402 is 16mL/g, the gas adsorption amount of the gas adsorption layer 402 is 20mL/g, the gas adsorption amount of the gas adsorption layer 402 is 30mL/g, or the gas adsorption amount of the gas adsorption layer 402 is 50 mL/g.

Preferably, the gas adsorption amount of the gas adsorption layer 402 is greater than 20mL/g, or the gas adsorption amount of the gas adsorption layer 402 is greater than 30 mL/g.

In other implementations, the gas adsorption amount of the gas adsorption layer 402 may be other values, which are not limited in this application.

In this application embodiment, the gas adsorption capacity of gas adsorption layer 402 is big more, and the adsorptivity is better, guarantees that gas adsorption layer can finish the gas adsorption in the battery monomer, avoids gaseous influence battery monomer's security performance.

According to some embodiments of the present application, referring to fig. 4, the gas suction member 40 includes a liquid-repellent gas-permeable layer 401, and the liquid-repellent gas-permeable layer 401 is located on one side surface of the gas adsorption layer 402.

According to other embodiments of the present application, referring to fig. 6, fig. 6 is a schematic structural diagram of a battery cell according to other embodiments of the present application, in which the gas absorbing member 40 includes two lyophobic and gas permeable layers 401, and the two lyophobic and gas permeable layers 401 are respectively located on two opposite surfaces of the gas absorbing layer 402.

According to other embodiments of the present application, referring to fig. 7, fig. 7 is a schematic structural diagram of a battery cell provided in other embodiments of the present application, wherein two opposite surfaces and each side surface of a gas adsorption layer 402 are provided with a lyophobic and breathable layer 401, and the side surface is located between the two opposite surfaces.

According to other embodiments of the present application, referring to fig. 8, fig. 8 is a schematic structural diagram of a battery cell according to other embodiments of the present application, and a lyophobic and breathable layer 401 is disposed on one side surface and each side surface of a gas adsorption layer 402.

Referring to fig. 6, when the getter member 40 includes two lyophobic and breathable layers 401, after the end cap 20 is manufactured, the inner surface of the end cap 20 may be coated with one lyophobic and breathable layer 401, then the gas adsorption layer 402 may be coated on the lyophobic and breathable layer 401, and then another lyophobic and breathable layer 401 may be coated on the gas adsorption layer 402 to form the entire getter member 40. Or after the air suction member 40 is manufactured, one of the lyophobic and breathable layers 401 is bonded to the inner side surface of the end cover 20 through adhesive.

For example, in the battery cell shown in fig. 7, after the end cap 20 is manufactured, the inner surface of the end cap 20 is coated with a lyophobic and breathable layer 401, a gas adsorption layer 402 is coated on the lyophobic and breathable layer 401, another lyophobic and breathable layer 401 is coated on the gas adsorption layer 402, and each side surface of the gas adsorption layer 402 is covered by the another lyophobic and breathable layer 401, so that the whole getter member 40 can be formed.

For example, for the battery cell shown in fig. 8, after the end cap 20 is manufactured, a gas adsorption layer 402 may be coated on the inner side surface of the end cap 20, and then a liquid-repellent gas-permeable layer 401 may be coated on the gas adsorption layer 402, where the liquid-repellent gas-permeable layer 401 covers one side surface and each side surface of the gas adsorption layer 402.

In the embodiment of the present application, when the gas suction member 40 includes a liquid-repellent gas-permeable layer 401, the gas suction member 40 occupies a small volume, and the energy density of the battery cell is not affected. At this time, the lyophobic and breathable layer 401 is located on one side surface of the gas adsorption layer 402 facing the electrolyte, and the other side surface of the gas adsorption layer 402 is attached to the end cover 20 or the inner wall of the casing 10, so that the gas adsorption layer 402 is prevented from contacting the electrolyte.

In this embodiment, when the air suction member 40 includes two lyophobic and air permeable layers 401, the two lyophobic and air permeable layers 401 can protect the gas adsorption layer 402 from two opposite surfaces of the gas adsorption layer 402, so as to further reduce the influence of the electrolyte on the gas adsorption layer 402 and ensure the adsorptivity of the air suction member 40.

In this application embodiment, the two opposite surfaces and each side of gas adsorption layer 402 all are provided with lyophobic ventilative layer 401, and lyophobic ventilative layer 401 has all protected gas adsorption layer 402's surface and side, further reduces the influence of electrolyte to gas adsorption layer 402, guarantees the adsorptivity of getter component 40.

In the embodiment of the present application, one side surface and each side surface of the gas adsorption layer 402 are provided with the lyophobic and breathable layer 401, and at this time, the other side surface of the gas adsorption layer 402 is attached to the inner side surface of the end cap 20 or the inner wall of the housing 10, so that the protection of the lyophobic and breathable layer 401 on the surface and the side surface of the gas adsorption layer 402 is ensured, the volume of the air suction member 40 is small, and the influence on the energy density of the battery cell is avoided.

According to some embodiments of the present application, the ratio between the amount of total mass of the gas adsorption layer 402 and the capacity of the battery cell is greater than or equal to 4 × 10 ^-5 mol/Ah of 8X 10 or less ^-4 mol/Ah。

In the embodiment of the present application, in the case that the material of the gas adsorption layer 402 is the same, the larger the capacity of the battery cell is, the more the battery cell generates gas, and the more the gas adsorption layer 402 is required to adsorb gas.

For example, the ratio of the total mass of the gas adsorption layer 402 to the cell capacity is 4 × 10 ^-5 mol/Ah, or the ratio of the total mass of the gas adsorption layer 402 to the capacity of the battery cell is 810 ^-5 mol/Ah, or the ratio of the total amount of the substances of the gas adsorption layer 402 to the capacity of the battery cell is 2X 10 ^-4 mol/Ah, or the ratio of the total amount of the substances of the gas adsorption layer 402 to the capacity of the battery cell is 8X 10 ^-4 mol/Ah。

Preferably, the ratio between the amount of total substance of the gas adsorption layer 402 and the capacity of the battery cell is greater than or equal to 8 × 10 ^-5 mol/Ah of 2X 10 or less ^-4 mol/Ah。

In other implementations, the ratio between the total mass of the gas adsorption layer 402 and the capacity of the battery cell may be other values, which is not limited by the embodiment of the present application.

In the embodiment of the present application, the ratio between the total substance amount of the gas adsorption layer 402 and the capacity of the battery cell is limited in the above range, which can ensure that the gas adsorption layer 402 can completely adsorb the gas in the battery cell, and avoid too much of the gas adsorption layer 402 from affecting the energy density of the battery cell.

According to some embodiments of the present application, there is provided a battery cell 120 including a case 10, an end cap 20, an electrode assembly 30, an electrolyte, and a gas suction member 40. The case 10 has a first receiving chamber in which the electrode assembly 30, the electrolyte and the getter member 40 are located, and an opening to which the cap 20 is fitted. The getter member 40 includes two lyophobic and gas permeable layers 401 and a gas adsorption layer 402, the two gas adsorption layers 402 are respectively located on two opposite surfaces of the lyophobic and gas permeable layer 401, the lyophobic and gas permeable layer 401 is used to separate the gas adsorption layer 402 from the electrolyte and the lyophobic and gas permeable layer 401 allows gas to permeate therethrough. The gas suction member 40 is disposed on a surface of the end cap 20 facing the electrode assembly 30.

The embodiment of the application provides a battery, and the battery comprises the battery cell of any embodiment.

The battery may be applied to, but 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. 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.

Through adopting the battery monomer in this application embodiment, can guarantee that the battery is difficult for the inflation, the security is high.

The embodiment of the application provides an electric device, which comprises the battery of any embodiment, wherein the battery is used for providing electric energy.

The powered device may be, but is not limited to, a cell phone, tablet, laptop, electronic toy, electric tool, battery car, electric car, ship, 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, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

Through adopting the battery in this application embodiment, can guarantee that the battery is difficult for inflation to make this power consumption device's security high.

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 is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery cell, comprising:

a housing (10) having a first accommodation chamber and an opening;

an end cap (20) covering the opening;

an electrode assembly (30) located in the first receiving cavity;

the electrolyte is accommodated in the first accommodating cavity;

a gas suction member (40) disposed in the first receiving cavity, the gas suction member (40) including a lyophobic and breathable layer (401) and a gas adsorption layer (402), the lyophobic and breathable layer (401) being disposed on at least one side surface of the gas adsorption layer (402), the lyophobic and breathable layer (401) being for separating the gas adsorption layer (402) and the electrolyte and the lyophobic and breathable layer (401) allowing gas to permeate therethrough;

wherein the thickness D1 of the lyophobic and breathable layer (401) is greater than or equal to 0.1 μm and less than or equal to 1000 μm.

2. The cell according to claim 1, characterised in that the getter member (40) is located between the electrolyte and the end cap (20).

3. The battery cell according to claim 2, characterized in that the getter member (40) is provided to an inner wall of the housing (10).

4. The battery cell according to claim 1, wherein the gas suction member (40) is provided on a surface of the end cap (20) facing the electrode assembly (30).

5. The battery cell according to claim 4, characterized in that the getter member (40) is coated on the end cap (20); alternatively, the first and second electrodes may be,

the air suction component (40) is fixedly arranged on the end cover (20) through a connecting piece.

6. The battery cell according to any of claims 1 to 5, characterized in that the thickness D2 of the gas adsorption layer (402) is greater than or equal to 0.1 μm and less than or equal to 1000 μm.

7. The battery cell according to any of claims 1-5, characterized in that the lyophobic breathable layer (401) has a plurality of gas permeable pores having a pore diameter greater than or equal to 2A and less than or equal to 6A.

8. The battery cell according to any of claims 1-5, characterized in that the static contact angle of the lyophobic gas permeable layer (401) is larger than 90 °.

9. The battery cell according to any of claims 1 to 5, characterized in that the roll angle of the lyophobic breathable layer (401) is less than 10 °.

10. The battery cell according to any of claims 1 to 5, characterized in that the gas adsorption layer (402) is adapted to chemically react with the gas.

11. The battery cell according to claim 10, characterized in that the material of which the gas adsorption layer (402) is made is a mixture comprising a hydroxide and a strong base and a weak acid salt.

12. The battery cell according to claim 10, characterized in that the mixture from which the gas adsorbing layer (402) is prepared further comprises an oxidizing agent.

13. The battery cell according to any of claims 1 to 5, characterized in that the gas adsorption layer (402) is configured to adsorb the gas by physical adsorption.

14. The battery cell according to claim 13, wherein the material from which the gas adsorption layer (402) is made comprises at least one of a nanoporous carbon material, a metal-organic framework, a zeolite, a porous organic polymer, and a porous silica.

15. The battery cell of claim 13, wherein the gas adsorption layer (402) has a plurality of adsorption pores having a pore diameter greater than or equal to 3 a and less than or equal to 10 a.

16. The cell according to claim 13, characterised in that the specific surface area of the gas sorption layer (402) is greater than or equal to 100m ² (ii) 3000m or less per gram ² /g。

17. The battery cell according to claim 13, wherein the gas adsorption layer (402) has a gas adsorption capacity of more than 15 mL/g.

18. The battery cell according to any one of claims 1 to 5, wherein the getter member (40) comprises two lyophobic and breathable layers (401), the two lyophobic and breathable layers (401) being respectively located on opposite surfaces of the gas adsorption layer (402); alternatively, the first and second electrodes may be,

the two opposite surfaces and each side of the gas adsorption layer (402) are provided with the lyophobic and breathable layer (401), wherein the side is positioned between the two opposite surfaces; alternatively, the first and second electrodes may be,

the air suction member (40) comprises a lyophobic and air-permeable layer (401), and the lyophobic and air-permeable layer (401) is positioned on one side surface of the gas adsorption layer (402); alternatively, the first and second electrodes may be,

the liquid-repellent and gas-permeable layer (401) is arranged on one side surface and each side surface of the gas adsorption layer (402).

19. The battery cell according to any of claims 1 to 5, characterized in that the ratio between the amount of total mass of the gas adsorption layer (402) and the capacity of the battery cell is greater than or equal to 4 x 10 ^-5 mol/Ah of 8X 10 or less ^-4 mol/Ah。

20. A battery comprising a cell according to any one of claims 1 to 19.

21. An electrical device comprising a battery as claimed in claim 20 for providing electrical energy.