CN217306587U

CN217306587U - Battery cell, battery and power consumption device

Info

Publication number: CN217306587U
Application number: CN202221611817.9U
Authority: CN
Inventors: 王文轩; 王国宝; 曹娇; 李航; 浦晨凯
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-08-26
Anticipated expiration: 2032-06-27

Abstract

The application relates to a battery monomer, a battery and an electric device. The battery monomer comprises a shell, electrolyte and an electrode assembly, wherein the electrolyte and the electrode assembly are accommodated in the shell; the liquid absorbing member is configured to absorb the electrolyte from the liquid absorbing end and discharge the electrolyte from the liquid discharging end to the diaphragm by capillary action. Through the capillary action of imbibition piece, adsorb the electrolyte in the shell to electrode subassembly department, and then can have free electrolyte in the shell, soak electrode subassembly in time for electrolyte can evenly distributed in electrode subassembly, has ensured that the free chemical properties of battery is stable. And the electrolyte absorbed by the liquid absorbing part can be directly discharged to the diaphragm, so that the electrolyte of the electrode assembly can be directly infiltrated and isolated to be uniformly distributed, and the infiltration effect and efficiency are also improved.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

The lithium ion battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, is widely used on portable electronic equipment such as mobile phones, digital cameras, portable computers and the like, and has wide application prospects in the aspects of electric vehicles such as electric automobiles and electric bicycles, large and medium-sized electric equipment such as energy storage facilities and the like.

The battery generally comprises a plurality of battery cells, and the electrolyte is one of the essential main materials for maintaining the normal operation of the battery cells, and in order to ensure the normal operation of the battery cells, the electrolyte needs to be uniformly distributed in the electrode assembly of the battery cells, but for the battery cells with larger sizes, the distribution uniformity of the electrolyte is difficult to achieve.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell, a battery, and an electric device, which can alleviate the problem that the distribution uniformity of an electrolyte in an electrode assembly of the battery cell is difficult to achieve in a battery cell having a large size.

In a first aspect, the present application provides a single battery, including a case, and an electrolyte and an electrode assembly accommodated in the case, where the electrode assembly includes a separator, and the single battery further includes:

the liquid absorbing piece is arranged in the shell and is provided with a liquid absorbing end and a liquid discharging end, and the liquid discharging end is contacted with the diaphragm;

the liquid absorbing member is configured to absorb the electrolyte from the liquid absorbing end and discharge the electrolyte from the liquid discharging end to the diaphragm by capillary action.

Above-mentioned battery monomer, through the capillary action of imbibition piece, adsorbs the electrolyte in the shell to electrode subassembly department, and then can have free electrolyte in the shell, soaks electrode subassembly in time for electrolyte can evenly distributed in electrode subassembly, has ensured that battery monomer's chemical properties is stable.

In addition, the electrolyte absorbed by the liquid absorbing part can be directly discharged to the diaphragm, so that the electrolyte of the electrode assembly can be directly infiltrated and isolated to be uniformly distributed, and the infiltration effect and efficiency are improved.

In some embodiments, the housing comprises a shell and a top cover, the shell is provided with a containing cavity and an opening communicated with the containing cavity, and the top cover is arranged at the opening;

the liquid absorbing member extends from the bottom of the housing toward the top cover.

By arranging the liquid absorbing member to extend from the bottom of the shell to the top cover, a large amount of free electrolyte at the bottom of the shell can be absorbed to the upper part and further absorbed and soaked by the electrode assembly at the upper part.

In some embodiments, the wicking member extends linearly. The linearly extending liquid absorbing piece can reduce the resistance in the process of absorbing the electrolyte and ensure the stable and reliable absorption effect.

In some embodiments, the case includes a case body having a receiving chamber and an opening communicating with the receiving chamber, the electrolyte and the electrode assembly being received in the receiving chamber, and a top cover covering the opening;

the discharge end is in contact with a portion of the diaphragm nearest the top cover. Thus, the liquid absorbing part can enter from the uppermost diaphragm of the electrode assembly, so that the electrolyte can fully infiltrate the diaphragm at the upper part of the electrode assembly, and the electrolyte is uniformly distributed in the electrode assembly.

In some embodiments, the absorbent member is tubular, and has an inner diameter of not less than 20 microns and not more than 500 microns; and/or

The outer diameter of the absorbent member is not less than 500 micrometers and not more than 2000 micrometers. Research shows that when the inner diameter of the liquid absorbing part is not less than 20 microns and not more than 500 microns, the capillary effect of the liquid absorbing part is good, and the reliability of the liquid absorbing part for absorbing electrolyte is improved. And when the outer diameter of the liquid absorbing piece is not less than 500 microns and not more than 2000 microns, the capillary effect of the liquid absorbing piece is good, and the reliability of the liquid absorbing piece for absorbing electrolyte is improved.

In some embodiments, the inner diameter of the absorbent member is no less than 100 microns and no greater than 300 microns; and/or

The outer diameter of the liquid absorbing member is not less than 800 micrometers and not more than 1500 micrometers. Research shows that when the inner diameter of the liquid absorbing part is not less than 100 microns and not more than 300 microns, the capillary effect of the liquid absorbing part can be optimized, strong adsorption force can be provided, electrolyte can be adsorbed to the electrode assembly, more electrolyte can be adsorbed, and the electrode assembly can be better and uniformly soaked. And when the outer diameter of the liquid absorbing piece is not less than 800 micrometers and not more than 1500 micrometers, the capillary effect of the liquid absorbing piece can be optimal, and strong adsorption force can be provided to adsorb electrolyte to the electrode assembly, so that more electrolyte can be adsorbed, and the electrode assembly can be better and uniformly soaked.

In some embodiments, the absorbent member is one of a metal absorbent member, a fiberglass absorbent member, and a polymeric absorbent member. Metal imbibition piece, glass fiber imbibition piece, macromolecular material imbibition piece all have stronger toughness, and the difficult breakable easy break, consequently, can guarantee its stable in structure under the condition that imbibition piece has less radial dimension.

In some embodiments, the absorbent member is a polyethylene absorbent member or a polypropylene absorbent member. The polyethylene imbibition piece and the polypropylene imbibition piece are made of high polymer materials, and have strong toughness, and the materials are not easy to break.

In some embodiments, a wicking member is disposed between the electrode assembly and the inner wall of the housing. By providing the liquid absorbing member between the electrode assembly and the inner wall of the case, the space within the case can be fully utilized, and the arrangement of other components within the case is not affected.

In some embodiments, the wicking member comprises a plurality, all of which are disposed around the electrode assembly. In this way, the free electrolyte in the case can be uniformly absorbed in the circumferential direction of the electrode assembly, and the electrolyte can be guided to all over the electrode assembly, thereby uniformly distributing the electrolyte in the electrode assembly.

In some embodiments, the absorbent member is secured to an inner wall of the housing. By fixing the liquid absorbing piece on the inner wall of the shell, the position of the liquid absorbing piece in the shell can be ensured to be reliable, and the adsorption effect of the liquid absorbing piece is further ensured to be reliable.

In some embodiments, the absorbent member is integrally formed with the housing. Through setting up imbibition piece and shell integrated into one piece, when can make the position of imbibition piece reliable, also make the free structure of battery compacter.

In some embodiments, the housing includes a first sidewall and a second sidewall, the first sidewall is connected to one side of the second sidewall and disposed at an angle to the second sidewall;

the area of the first side wall is larger than that of the second side wall, and the liquid absorbing piece is arranged between the first side wall and the electrode assembly; and/or

A corner is formed between the first sidewall and the second sidewall, and a wicking member is disposed between the electrode assembly and the corner. Through locating imbibition piece between the great first lateral wall of area and electrode subassembly, on the one hand, because the space between first lateral wall and the electrode subassembly is great, has a large amount of free electrolytes in it, so can ensure that imbibition piece can adsorb a large amount of electrolytes to electrode subassembly department, on the other hand, the side of the electrode subassembly that first side corresponds also is big face, can make imbibition piece arrange electrolyte to electrode subassembly department fully, has improved infiltration efficiency and effect by a wide margin. In addition, the space of the corner between the first side wall and the second side wall is large, and more free electrolyte is easy to store, so that the liquid absorbing piece is arranged between the electrode assembly and the corner, the liquid absorbing piece can be ensured to absorb more electrolyte to the electrode assembly, the electrolyte is discharged to the electrode assembly, and the soaking efficiency and the soaking effect are greatly improved.

In some embodiments, the electrode assemblies include a plurality of electrode assemblies, and the liquid absorbing member is disposed between adjacent two of the electrode assemblies. By providing the liquid absorbing member between the adjacent two electrode assemblies, the space within the case can be fully utilized without affecting the arrangement of other components within the case.

In some embodiments, the wicking member is secured to the electrode assembly. By fixing the liquid absorbing member to the electrode assembly, the position of the liquid absorbing member in the case can be ensured to be reliable, and the adsorption action of the liquid absorbing member can be ensured to be reliable.

In some embodiments, the wicking member is external to the electrode assembly. Through setting up the imbibition piece and being independent of outside the electrode subassembly, can reduce the influence to the electrode subassembly, avoid the setting up of imbibition piece to influence whole battery cell's performance stability.

In some embodiments, the wicking end communicates between the housing and the electrode assembly, and the drainage end is disposed closer to the electrode assembly than the wicking end. Through with imbibition end intercommunication between shell and electrode subassembly to set up the flowing back end and compare the imbibition end and be closer to electrode subassembly, can ensure that imbibition piece adsorbs to electrode subassembly department with free electrolyte from between shell and the electrode subassembly, and then improves the absorption reliability of imbibition piece.

In some embodiments, the liquid absorbing member has a liquid absorbing port at the liquid absorbing end and a liquid discharging port at the liquid discharging end, and the liquid absorbing member further has a liquid guiding passage communicating the liquid absorbing port and the liquid discharging port. Through seting up the drain passageway that communicates imbibition mouth and leakage fluid dram, can reduce the resistance of absorption electrolyte in-process, and then improve the adsorption effect.

In a second aspect, the present application provides a battery including a battery cell as in any of the embodiments above.

Above-mentioned battery, through the capillary action of imbibition piece, adsorb the electrolyte in the shell to electrode subassembly department, and then can have free electrolyte in the shell, in time soaks electrode subassembly for electrolyte can evenly distributed in electrode subassembly, has ensured that the free chemical properties of battery is stable, and then has ensured that the chemical properties of battery is stable.

In a third aspect, the present application provides an electric device comprising a battery as in any of the embodiments above.

Above-mentioned power consumption device, through the capillary action of imbibition piece, adsorbs the electrolyte in the shell to electrode subassembly department, and then can have free electrolyte in the shell, soaks electrode subassembly in time for electrolyte can evenly distributed in electrode subassembly, has ensured that the chemical properties of battery is stable, and then has ensured that power consumption device's chemical properties is stable.

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

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

fig. 2 is an exploded view of a battery provided by 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 partial structure of a battery cell in an embodiment of the present application;

fig. 5 is a schematic top view of a portion of the battery cell shown in fig. 4;

fig. 6 is a schematic view of a cross-sectional structure a-a of a portion of the structure of the battery cell shown in fig. 5;

fig. 7 is a schematic structural view of another portion of a battery cell in some embodiments of the present application;

fig. 8 is a schematic bottom view of another part of the battery cell shown in fig. 7.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

a battery 100;

a controller 200;

a motor 300;

a case 10;

a first portion 11, a second portion 12;

a battery cell 20;

top cover 21, electrode terminal 211, case 22, receiving cavity 221, opening 222, electrode assembly 23, tab 231, case 24, first side wall 241, second side wall 242, wicking member 25, wicking end 251, and liquid discharge end 252.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as 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 the association 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 associated 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 stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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.

The lithium ion battery is the most advanced commercial secondary battery in the world at present, and with the development of various electronic products, the demand of the market for the lithium ion battery is rapidly increased. Lithium ion batteries are widely used because of their advantages such as high discharge voltage, high energy density, and excellent low self-discharge characteristics.

In the prior art, the lithium ion battery mainly adopts liquid electrolyte, and the infiltration of the liquid electrolyte on an electrode assembly is mainly to transport the electrolyte through the capillary action of a cathode pole piece, an anode pole piece and a separation membrane of the electrode assembly on the electrolyte.

Research shows that the impregnation speed of the battery monomer and the electrolyte on the electrode assembly is acceptable for the battery monomer with smaller energy density and volume. However, for a battery cell with a large size, for example, a battery cell with a large thickness or a large height, the electrolyte cannot rapidly infiltrate into the electrode assembly through the capillary action of the negative electrode sheet, the positive electrode sheet and the separator, and the electrolyte cannot be uniformly distributed in the electrode assembly, so that a series of problems such as lithium precipitation, cycle water jumping and the like are caused, and the electrochemical performance of the battery is affected.

Based on the above consideration, in order to solve the problem that the electrolyte cannot be uniformly distributed in the electrode assembly, through intensive research by the applicant, a single battery is designed, and the liquid absorbing member is arranged in the shell of the single battery, so that the electrolyte is absorbed to the diaphragm through the capillary action of the liquid absorbing member, and then the electrode assembly can be timely infiltrated when free electrolyte exists in the shell, so that the electrolyte can be uniformly distributed in the electrode assembly, and the chemical performance stability of the battery is ensured. And the electrolyte absorbed by the liquid absorbing part can be directly discharged to the diaphragm, so that the electrolyte of the electrode assembly can be directly infiltrated and isolated to be uniformly distributed, and the infiltration effect and efficiency are also improved.

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 with the electric device formed by the single batteries, the batteries and the like disclosed by the application can be used, so that the situation that electrolyte cannot be uniformly distributed in the electrode assembly is relieved, and the electrochemical performance of the batteries is improved.

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, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

For convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as an example of 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 a range-extended 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, and for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

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 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 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 multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 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 10. The battery 100 may also include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 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 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes a top cover 21, a case 22, an electrode assembly 23, and other functional components.

The top cover 21 is a member that covers the opening 222 of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the top cover 21 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the top cover 21 is not easily deformed when being impacted by extrusion, and thus the battery cell 20 may have higher structural strength and improved safety performance. The top cover 21 may be provided with functional components such as the electrode terminals 211. The electrode terminal 211 may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further disposed on the top cover 21. The top cover 21 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, an insulator may also be provided on the inside of the top cover 21, which may be used to isolate the electrical connections within the housing 22 from the top cover 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for fitting the top cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, an electrolyte, and other components. The housing 22 and the top cover 21 may be separate components, and an opening 222 may be formed in the housing 22, and the top cover 21 may cover the opening 222 at the opening 222 to form an internal environment of the battery cell 20. Without limitation, the top cover 21 and the housing 22 may be integrated, and specifically, the top cover 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to seal the interior of the housing 22, the top cover 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 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.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 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 tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab 231. 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 231 is connected to the electrode terminal to form a current loop.

According to some embodiments of the present disclosure, referring to fig. 3 to 6, fig. 4 is a schematic structural diagram of a partial structure of a battery cell in an embodiment of the present disclosure, fig. 5 is a schematic structural diagram of a top view of the partial structure of the battery cell shown in fig. 4, and fig. 6 is a schematic structural diagram of a-a cross section of the partial structure of the battery cell shown in fig. 5. The present application provides a battery cell 20. The battery cell 20 includes a case 24, and an electrolyte and an electrode assembly 23 housed within the case 24. The electrode assembly 23 includes a separator. The battery cell 20 further includes a wicking member 25, the wicking member 25 being disposed within the housing 24. The wicking member 25 has a wicking end 251 and a drainage end 252. The discharge end 252 contacts the diaphragm. The liquid absorbing member 25 is configured to absorb the electrolyte from the liquid absorbing end 251 and discharge the electrolyte from the liquid discharging end 252 to the diaphragm by capillary action.

Capillary action, refers to the attraction of a liquid surface to a solid surface. Specifically, when the liquid absorbing member 25 is inserted into the electrolyte, the liquid level inside the liquid absorbing member 25 rises higher than the liquid level outside the liquid absorbing member 25, thereby adsorbing the electrolyte to the electrode assembly 23.

It should be noted that the capillary action is generated in relation to a number of factors, including solids, liquids, gases, structures, etc.

Through the capillary action of the liquid absorbing member 25, the electrolyte in the case 24 is absorbed to the electrode assembly 23, and then the electrode assembly 23 can be timely infiltrated when free electrolyte exists in the case 24, so that the electrolyte can be uniformly distributed in the electrode assembly 23, and the chemical performance stability of the battery cell 20 is ensured.

In addition, the electrolyte absorbed by the liquid absorbing part can be directly discharged to the diaphragm, so that the electrolyte of the electrode assembly can be directly infiltrated and isolated to be uniformly distributed, and accordingly, infiltration effect and efficiency are improved.

It is also noted that the electrolyte absorbed by the absorbent member 25 may include the electrolyte between the case 24 and the electrode assembly 23.

Optionally, the suction end 251 and the discharge end 252 are oppositely disposed. According to some embodiments of the present application, referring to fig. 3 and 4, the housing 24 includes a housing 22 and a cap 21. The housing 22 has a housing chamber 221 and an opening 222 communicating with the housing chamber 221. The top cover 21 covers the opening 222. The liquid absorbing member 25 extends from the bottom of the housing 22 toward the top cover 21.

The bottom of the housing 22 refers to a portion on the side opposite to the top cover 21. During the use of the battery cell 20, the top cover 21 is usually upward, and the housing 22 is located at the lower side of the top cover 21, so that the electrolyte is gathered at the bottom of the housing 22 under the action of gravity.

By providing the liquid absorbing member 25 extending from the bottom of the case 22 in the direction toward the top cover 21, a large amount of free electrolyte at the bottom of the case 22 can be absorbed upward and further absorbed and wetted by the electrode assembly 23 above.

Specifically, the liquid absorbing member 25 may extend from the bottom of the housing 22 toward the top cover 21 to a position close to the top cover 21, or may extend only to a position half the height of the housing 22, which is not limited herein.

When the liquid absorbing member 25 extends from the bottom of the case 22 toward the top cap 21 to a position close to the top cap 21, the electrolyte can enter from the uppermost part of the electrode assembly 23, so that the electrolyte can sufficiently infiltrate the upper part of the electrode assembly 23, and the electrolyte can be uniformly distributed in the electrode assembly 23.

When the liquid absorbing member 25 extends from the bottom of the case 22 to a position half the height of the case 22 in the direction of the top cover 21, the problem of less electrolyte in the middle upper part can be alleviated, and the phenomenon of lithium precipitation in the middle upper part can be alleviated.

According to some embodiments of the present application, referring to fig. 4-6, the wicking member 25 extends linearly.

The linearly extending liquid absorbing member 25 can reduce the resistance in the process of absorbing the electrolyte, and ensure the stable and reliable absorption effect.

In other embodiments, the liquid absorbing member 25 may extend in a curved shape, a bent shape, or the like, and is not limited thereto. According to some embodiments of the present application, referring to fig. 3-6, the housing 24 includes a shell 22 and a top cover 21. The housing 22 has a housing chamber 221 and an opening 222 communicating with the housing chamber 221. The top cover 21 covers the opening 222. The discharge end 252 contacts the portion of the diaphragm nearest the top cover 21.

The portion of the diaphragm nearest the top cover 21 may also refer to the portion of the diaphragm furthest from the bottom of the housing 22. In this way, the liquid absorbing member 25 can be inserted from the uppermost separator of the electrode assembly 23, and the electrolyte can sufficiently infiltrate the separator on the upper portion of the electrode assembly 23, so that the electrolyte can be uniformly distributed in the electrode assembly 23.

In practical use, the separator protrudes from the positive electrode tab and the negative electrode tab toward the top cover 21, so that the separator is forced to be bent when the top cover 21 is covered on the case 22, thereby allowing the wicking member 25 to smoothly contact the uppermost separator of the electrode assembly 23.

In other embodiments, the discharge end 252 of the absorbent member 25 can contact the diaphragm at other locations, such as, but not limited to, half the height of the housing 22.

According to some embodiments of the present application, referring to fig. 6, the liquid absorbent member 25 has a tubular shape, and the inner diameter of the liquid absorbent member 25 is 20 micrometers and not more than 500 micrometers.

It has been found through research that when the inner diameter of the liquid absorbing member 25 is in the range of 20 micrometers to not more than 500 micrometers, the capillary effect of the liquid absorbing member 25 can be made good, and the reliability of the liquid absorbing member 25 for absorbing the electrolyte can be improved.

According to some embodiments of the present application, referring to fig. 6, the absorbent member 25 has a tubular shape, and the outer diameter of the absorbent member 25 is 500 micrometers to not more than 2000 micrometers.

Research shows that when the outer diameter of the liquid absorbing member 25 is within the range of 500 micrometers to not more than 2000 micrometers, the capillary effect of the liquid absorbing member 25 is also good, and the reliability of the liquid absorbing member 25 for absorbing electrolyte is improved.

According to some embodiments of the present application, referring to fig. 6, the liquid absorbent member 25 has a tubular shape, the inner diameter of the liquid absorbent member 25 is 20 micrometers to not more than 500 micrometers, and the outer diameter of the liquid absorbent member 25 is not less than 500 micrometers to not more than 2000 micrometers.

According to some embodiments of the present application, the inner diameter of the wicking member 25 is no less than 100 microns and no greater than 300 microns.

It is found through research that when the inner diameter of the liquid absorbing member 25 is within a range of not less than 100 micrometers and not more than 300 micrometers, the capillary effect of the liquid absorbing member 25 can be optimized, and a strong adsorption force can be provided to adsorb the electrolyte to the electrode assembly 23, so that more electrolyte can be adsorbed, and the electrode assembly 23 can be better and uniformly infiltrated.

According to some embodiments of the present application, the outer diameter of the wicking member 25 is no less than 800 microns and no greater than 1500 microns.

Research shows that when the outer diameter of the liquid absorbing member 25 is not less than 800 micrometers and not more than 1500 micrometers, the capillary effect of the liquid absorbing member 25 can be optimized, and a strong adsorption force can be provided to adsorb the electrolyte to the electrode assembly 23, so that more electrolyte can be adsorbed, and the electrode assembly 23 can be better and uniformly infiltrated.

According to some embodiments of the present application, the inner diameter of the absorbent member 25 is not less than 100 microns and not more than 300 microns, and the outer diameter of the absorbent member 25 is not less than 800 microns and not more than 1500 microns.

According to some embodiments of the present application, the absorbent member 25 is one of a metal absorbent member, a glass fiber absorbent member, and a polymeric material absorbent member.

Metal imbibition piece, glass fiber imbibition piece, macromolecular material imbibition piece all have stronger toughness, and difficult fragile easy-breaking, consequently, can guarantee its stable in structure under the condition that imbibition piece 25 has less radial dimension.

According to some embodiments of the present application, the absorbent member 25 is a polyethylene absorbent member or a polypropylene absorbent member.

The polyethylene imbibition piece and the polypropylene imbibition piece are made of high polymer materials, and have strong toughness, and the materials are not easy to break.

According to some embodiments of the present application, referring to fig. 3 and 4, a wicking member 25 is disposed between the electrode assembly 23 and the inner wall of the housing 24.

By providing the liquid absorbing member 25 between the electrode assembly 23 and the inner wall of the case 24, the space within the case 24 can be sufficiently utilized, and the arrangement of other components within the case 24 is not affected.

According to some embodiments of the present application, referring to fig. 3 and 4, the wicking member 25 includes a plurality, and all of the wicking member 25 is disposed around the electrode assembly 23.

In this way, the free electrolyte in the case 24 can be uniformly absorbed in the circumferential direction of the electrode assembly 23, and the electrolyte can be guided to all over the electrode assembly 23, thereby uniformly distributing the electrolyte in the electrode assembly 23.

Alternatively, all of the absorbent members 25 are spaced apart from one another. In other embodiments, all of the absorbent members 25 may be disposed in connection with each other, without limitation.

According to some embodiments of the present application, referring to FIGS. 3-5, a wicking member 25 is secured to an inner wall of the housing 24.

By fixing the liquid absorbing material 25 to the inner wall of the housing 24, the position of the liquid absorbing material 25 in the housing 24 can be secured, and the adsorption action of the liquid absorbing material 25 can be secured.

Alternatively, the liquid-absorbing member 25 may be welded to the case 22 when the liquid-absorbing member 25 is a metal liquid-absorbing member, and the liquid-absorbing member 25 may be bonded to the inner wall of the outer shell 24 when the liquid-absorbing member 25 is a glass fiber liquid-absorbing member or a polymer material liquid-absorbing member.

According to some embodiments of the present application, the wicking member 25 is integrally formed with the housing 24.

The liquid absorbing material 25 is integrally molded with the housing 24 by integrally molding an integral member including the liquid absorbing material 25 and the housing 24 by an integral molding process.

By providing the liquid absorbing member 25 integrally formed with the case 24, the structure of the battery cell 20 can be made more compact while the position of the liquid absorbing member 25 is secured.

According to some embodiments of the present application, referring to fig. 3 and 5, the housing 24 includes a first sidewall 241 and a second sidewall 242. The first sidewall 241 is connected to one side of the second sidewall 242 and is disposed at an angle to the second sidewall 242. The area of the first sidewall 241 is larger than that of the second sidewall 242. The wicking member 25 is disposed between the first sidewall 241 and the electrode assembly 23.

By disposing the liquid absorbing member 25 between the first sidewall 241 with a large area and the electrode assembly 23, on one hand, since the space between the first sidewall 241 and the electrode assembly 23 is large and a large amount of free electrolyte is contained therein, the liquid absorbing member 25 can absorb a large amount of electrolyte to the electrode assembly 23, and on the other hand, the side surface of the electrode assembly 23 corresponding to the first sidewall 241 is also large, so that the liquid absorbing member 25 can sufficiently discharge electrolyte to the electrode assembly 23, thereby greatly improving the wetting efficiency and effect.

Optionally, the housing 24 includes two first sidewalls 241 oppositely disposed along a first direction and two second sidewalls 242 oppositely disposed along a second direction, the first direction and the second direction intersect, and the two first sidewalls 241 and the two second sidewalls 242 are connected to each other to form the accommodating cavity 221. The liquid-absorbing member 25 includes a plurality of members, and a part of the liquid-absorbing member 25 is provided between one of the first side walls 241 and the electrode assembly 23, and another part of the liquid-absorbing member 25 is provided between the other first side wall 241 and the electrode assembly 23. Specifically, the first direction is a thickness direction of the battery cell 20, and the second direction is a length direction of the battery cell 10.

According to some embodiments of the present application, referring to fig. 3 and 5, the housing 24 includes a first sidewall 241 and a second sidewall 242. The first sidewall 241 is connected to one side of the second sidewall 242 and is disposed at an angle to the second sidewall 242. The first side wall 241 and the second side wall 242 form a corner therebetween, and the wicking member 25 is disposed between the electrode assembly 23 and the corner.

The space at the corner between the first side wall 241 and the second side wall 242 is large, and a large amount of free electrolyte is easily stored, so that the liquid absorbing member 25 is arranged between the electrode assembly 23 and the corner, so that the liquid absorbing member 25 can absorb a large amount of electrolyte to the electrode assembly 23 and discharge the electrolyte to the electrode assembly 23, and the wetting efficiency and effect are greatly improved.

According to some embodiments of the present application, referring to fig. 3 and 5, the housing 24 includes a first sidewall 241 and a second sidewall 242. The first sidewall 241 is connected to one side of the second sidewall 242 and is disposed at an angle to the second sidewall 242. The area of the first sidewall 241 is larger than that of the second sidewall 242. The wicking member 25 is disposed between the first sidewall 241 and the electrode assembly 23. The first sidewall 241 and the second sidewall 242 form a corner therebetween. A wicking member 25 is disposed between the electrode assembly 23 and the corners.

Specifically, the wicking member 25 includes a plurality of members, and a part of the wicking member 25 is disposed between the first sidewall 241 and the electrode assembly 23, and another part of the wicking member 25 is disposed between the electrode assembly 23 and the corner.

According to some embodiments of the present application, referring to fig. 7 and 8, the electrode assembly 23 includes a plurality of electrode assemblies, and the wicking member 25 is disposed between adjacent two of the electrode assemblies 23.

By providing the liquid absorbing member 25 between the adjacent two electrode assemblies 23, the space within the case 24 can be fully utilized without affecting the arrangement of other components within the case 24.

According to some embodiments of the present application, referring to fig. 7 and 8, a wicking member 25 is secured to the electrode assembly 23.

By fixing the liquid-absorbing material 25 to the electrode assembly 23, the position of the liquid-absorbing material 25 in the case 24 and the suction action of the liquid-absorbing material 25 can be secured.

Alternatively, the absorbent member 25 is bonded to the electrode assembly 23.

Alternatively, the wicking member 25 is secured to the separator of the electrode assembly 23.

In the present embodiment, the liquid absorbing member 25 includes a plurality of liquid absorbing members 25, and the plurality of liquid absorbing members 25 are disposed in a row between two adjacent electrode assemblies 23.

According to some embodiments of the present application, referring to fig. 7 and 8, the wicking member 25 is external to the electrode assembly 23.

The fact that the wicking member 25 is separate from the electrode assembly 23 means that the wicking member 25 and the electrode assembly 23 are two separate components, not belonging to each other, and the roles of both are not replaceable.

By arranging the liquid absorbing member 25 separately from the electrode assembly 23, the influence on the electrode assembly 23 can be reduced, and the influence of the arrangement of the liquid absorbing member 25 on the performance stability of the whole battery cell 20 can be avoided.

According to some embodiments of the present application, referring to fig. 3 and 6, wicking end 251 communicates between housing 24 and electrode assembly 23, and drainage end 252 is disposed closer to electrode assembly 23 than wicking end 251.

By connecting the liquid suction end 251 between the case 24 and the electrode assembly 23 and disposing the liquid discharge end 252 closer to the electrode assembly 23 than the liquid suction end 251, it is ensured that the liquid absorbent member 25 absorbs the dissociated electrolyte from between the case 24 and the electrode assembly 23 to the electrode assembly 23, thereby improving the absorption reliability of the liquid absorbent member 25.

According to some embodiments of the present application, referring to fig. 4 and 6, the liquid absorbing member 25 has a liquid absorbing port at the liquid absorbing end 251 and a liquid discharging port at the liquid discharging end 252, and the liquid absorbing member 25 further has a liquid guiding passage communicating the liquid absorbing port and the liquid discharging port.

Through seting up the drain passageway of intercommunication imbibition mouth and leakage fluid dram, can reduce the resistance of absorption electrolyte in-process, and then improve the adsorption effect.

It should be noted that the above-mentioned liquid guiding channel refers to a liquid guiding channel having a substantially hollow channel, and the liquid guiding channel is defined by the inner wall of the liquid absorbing member 25.

According to some embodiments of the present application, there is provided a battery including the battery cell 20 of any of the above embodiments.

Through the capillary action of the liquid absorbing part 25, the electrolyte in the shell 24 is absorbed to the electrode assembly 23, and then the electrode assembly 23 can be infiltrated in time when free electrolyte exists in the shell 24, so that the electrolyte can be uniformly distributed in the electrode assembly 23, the chemical performance stability of the battery monomer 20 is ensured, and the chemical performance stability of the battery 100 is further ensured.

According to some embodiments of the present application, there is provided an electric device including the battery 100 of any of the above embodiments.

The electrolyte in the shell 24 is absorbed to the electrode assembly 23 through the capillary action of the liquid absorbing member 25, so that the electrode assembly 23 can be infiltrated in time when free electrolyte exists in the shell 24, the electrolyte can be uniformly distributed in the electrode assembly 23, the chemical property stability of the battery 100 is ensured, and the reliable operation of the electric device is further ensured.

According to some embodiments of the present application, referring to fig. 3-8, the present application provides a battery cell 20 including a case 24, and an electrolyte and a plurality of electrode assemblies 23 housed within the case 24. The housing 24 includes a case 22 and a top cover 21. The housing 22 has a housing chamber 221 and an opening 222 communicating with the housing chamber 221. The top cover 21 covers the opening 222. The housing 22 includes a first sidewall 241 and a second sidewall 242. The first sidewall 241 is connected to one side of the second sidewall 242 and is disposed at an angle to the second sidewall 242. The area of the first sidewall 241 is larger than that of the second sidewall 242. The first sidewall 241 and the second sidewall 242 form a corner therebetween. The battery cell 20 further includes a plurality of wicking members 25, the plurality of wicking members 25 being disposed within the housing 24. The partial wicking member 25 is disposed between the first sidewall 241 and the electrode assembly 23 and is fixed to the inner wall of the casing 24. Another portion of the wicking member 25 is disposed between the electrode assembly 23 and the corner and is fixed to the inner wall of the case 24. A further part of the wicking member 25 is disposed between adjacent two of the electrode assemblies 23 and is fixed to the electrode assemblies 23. The liquid absorbing member 25 is tubular, the inner diameter of the liquid absorbing member 25 is not less than 100 micrometers and not more than 300 micrometers, and the outer diameter of the liquid absorbing member 25 is not less than 800 micrometers and not more than 1500 micrometers. The wicking member 25 has a wicking end 251 and a drainage end 252. The wicking end 251 communicates between the can 24 and the electrode assembly 23, and the wicking end 252 is disposed closer to the electrode assembly 23 than the wicking end 251. The liquid absorbing member 25 extends linearly from the bottom of the housing 22 toward the top cover 21. The discharge end 252 contacts the portion of the diaphragm nearest the top cover 21.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand 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. The utility model provides a battery monomer, includes the shell and accept electrolyte and electrode subassembly in the shell, electrode subassembly includes the diaphragm, its characterized in that, battery monomer still includes:

a wicking element disposed within the housing, the wicking element having a wicking end and a drainage end, the drainage end being in contact with the membrane;

the liquid absorbing member is configured to be capable of absorbing the electrolyte from the liquid absorbing end and discharging the electrolyte from the liquid discharging end to the separator by capillary action.

2. The battery cell as recited in claim 1, wherein the housing comprises a casing and a top cover, the casing has a cavity and an opening communicating with the cavity, and the top cover covers the opening;

the wicking member extends from the bottom of the housing in a direction toward the top cover.

3. The battery cell as recited in claim 1 wherein the wicking member extends linearly.

4. The battery cell as recited in claim 1, wherein the case includes a case body having a receiving cavity and an opening communicating with the receiving cavity, the electrolyte and electrode assembly being received in the receiving cavity, and a top cover covering the opening;

the discharge end is in contact with a portion of the diaphragm that is closest to the top cover.

5. The battery cell according to claim 1, wherein the liquid absorbing member has a tubular shape, and an inner diameter of the liquid absorbing member is not less than 20 micrometers and not more than 500 micrometers; and/or

The outer diameter of the liquid absorbing member is not less than 500 micrometers and not more than 2000 micrometers.

6. The battery cell as recited in claim 5 wherein the inner diameter of the liquid absorbing member is not less than 100 microns and not more than 300 microns; and/or

The outer diameter of the liquid absorbing member is not less than 800 micrometers and not more than 1500 micrometers.

7. The battery cell as recited in claim 1, wherein the liquid absorbing member is one of a metal liquid absorbing member, a glass fiber liquid absorbing member, and a polymer material liquid absorbing member.

8. The battery cell as recited in claim 1 wherein the fluid absorbent member is a polyethylene fluid absorbent member or a polypropylene fluid absorbent member.

9. The battery cell as recited in any one of claims 1 to 8, wherein the liquid absorbing member is provided between the electrode assembly and an inner wall of the case.

10. The battery cell as recited in claim 9 wherein the wicking member comprises a plurality, all of the wicking member being disposed around the electrode assembly.

11. The battery cell as recited in claim 9 wherein the wicking member is secured to an inner wall of the housing.

12. The battery cell as recited in claim 11 wherein the fluid absorbent member is integrally formed with the housing.

13. The battery cell as recited in claim 9, wherein the housing comprises a first sidewall and a second sidewall, the first sidewall being connected to one side of the second sidewall and disposed at an angle to the second sidewall;

A corner is formed between the first sidewall and the second sidewall, and the wicking member is disposed between the electrode assembly and the corner.

14. The battery cell according to any one of claims 1 to 8, wherein the electrode assembly includes a plurality of the electrode assemblies, and the liquid absorbing member is provided between adjacent two of the electrode assemblies.

15. The battery cell as recited in claim 14 wherein the wicking member is secured to the electrode assembly.

16. The battery cell as recited in claim 1 wherein the wicking member is external to the electrode assembly.

17. The battery cell as recited in claim 1 wherein the wicking end communicates between the housing and the electrode assembly, the drainage end being disposed closer to the electrode assembly than the wicking end.

18. The battery cell as recited in claim 17, wherein the liquid absorbing member has a liquid absorbing port at the liquid absorbing end, and a liquid discharging port at the liquid discharging end, and the liquid absorbing member further has a liquid guiding passage communicating the liquid absorbing port and the liquid discharging port.

19. A battery comprising the battery cell according to any one of claims 1 to 18.

20. An electrical device comprising the battery of claim 19.