CN215989150U

CN215989150U - Annotate liquid hole sealing device, end cover subassembly, battery monomer, battery and consumer

Info

Publication number: CN215989150U
Application number: CN202122347218.2U
Authority: CN
Inventors: 邹洋; 李英; 郭京浩; 蔡雅芝; 舒落生; 迟庆魁
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-03-08
Anticipated expiration: 2031-09-27
Also published as: WO2023045401A1

Abstract

The application discloses annotate liquid hole sealing device, end cover subassembly, battery monomer, battery and consumer, annotate liquid hole sealing device and include: the sealing seat is arranged in the liquid injection hole and comprises a connecting part and a sealing part which are axially distributed in sequence, the connecting part is connected with the battery end cover in a sealing way, the sealing seat is provided with a through hole which penetrates through the connecting part and the sealing part, and the through hole is communicated with the liquid injection hole; the sealing hole cover is connected with the sealing part in a sealing way; the sealing heat insulation assembly is arranged between the hole sealing seat and the hole sealing cover and completely covers the through hole; the sealing heat insulation assembly is connected with the sealing part in a sealing mode under the pressure action of the sealing hole cover. In the technical scheme of this application embodiment, set up the hole sealing seat and correspond and set up the handhole door and sealed thermal-insulated subassembly above the battery end cover notes liquid hole. The mechanical strength of the liquid filling hole is ensured by sealing the sealing hole cover and the sealing heat insulation assembly, so that the battery continues to operate normally, and the problem that the battery cannot be circularly replenished is solved.

Description

Annotate liquid hole sealing device, end cover subassembly, battery monomer, battery and consumer

Technical Field

The application relates to the field of batteries, in particular to a liquid injection hole sealing device, an end cover assembly, a battery monomer, a battery and electric equipment.

Background

The lithium ion power battery is the mainstream choice for the power battery of the electric automobile by virtue of the advantages of high energy, high working voltage, wide working temperature range, long storage life and the like.

At present, the electrolyte is required to be periodically supplemented to a battery core, a liquid injection hole is mostly welded on a battery end cover by using a sealing nail, and after the assembly is completed, the circulating liquid supplement of the battery cannot be performed.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the application provides a notes liquid hole sealing device, end cover subassembly, battery monomer, battery and consumer, can solve the follow-up unable problem of carrying out circulation fluid infusion of battery.

In a first aspect, the present application provides a pour spout sealing device, comprising: the hole sealing seat is arranged at the liquid injection hole, comprises a connecting part and a sealing part which are sequentially distributed along the axial direction, is connected with the battery end cover in a sealing way, and is provided with a through hole which penetrates through the connecting part and the sealing part and is communicated with the liquid injection hole, and the outer diameter of the sealing part is larger than that of the connecting part; a sealing cover connected with the sealing part in a sealing way; the sealing heat insulation assembly is arranged between the hole sealing seat and the hole sealing cover and completely covers the through hole; wherein, the sealed thermal-insulated subassembly is connected with the sealing under the pressure effect of hole sealing lid.

In the technical scheme of this application embodiment, set up the hole sealing seat and correspond and set up the handhole door and sealed thermal-insulated subassembly above the notes liquid hole of battery end cover. With the arrangement, when the liquid injection hole is closed, the sealing and heat-insulating assembly is fixed on the hole sealing seat by the hole sealing cover, so that stable mechanical connection between the sealing and heat-insulating assembly and the hole sealing seat is maintained; when electrolyte needs to be filled, the hole sealing cover and the sealing heat insulation assembly are taken down from the hole sealing seat, the liquid injection device directly injects liquid through the through hole, and the through hole is communicated with the liquid injection hole to realize the supplement of the electrolyte of the battery core. After the liquid injection is completed, the sealing performance of the liquid injection hole can be ensured by sealing the sealing hole cover and the sealing heat insulation assembly, so that the battery continues to normally operate, and the function of circularly replenishing the liquid to the cell assembly is realized.

In some embodiments, the outer end face of the hole sealing cover is provided with a limiting groove sunken towards the hole sealing seat, the cover edge of the hole sealing cover is inwards folded along the circumferential direction to form a buckling part, the bottom of the limiting groove is in sealing fit with the sealing heat insulation assembly, and the buckling part is in sealing fit with one side of the sealing part facing the end cover. Through setting up spacing recess and buckling parts, carry out the application of force to sealed thermal-insulated subassembly and hole sealing seat along axial direction's both ends, prevent that the sealing member is ageing, promote the mechanical properties between hole sealing lid and the hole sealing seat.

In some embodiments, the side of the sealing part facing the liquid filling hole is provided with a protruding positioning ring surrounding the connecting part, the positioning ring is arranged at a distance from the connecting part, and the cover edge of the sealing cover is folded inwards towards the limiting groove, so that the end part of the sealing cover wraps the positioning ring. By arranging the positioning ring, the cover edge of the hole sealing cover is folded upwards, and the mechanical stability of connection between the hole sealing cover and the hole sealing seat is further improved.

In some embodiments, the sealed insulating assembly includes an insulating spacer, a sealing spacer, and a cushion spacer arranged in a stack, the insulating spacer being disposed toward the through hole. The heat insulation gasket is arranged towards the through hole to absorb heat, the hot air is prevented from damaging the sealing gasket and the buffer gasket, the sealing gasket is arranged again to seal, and the long-term stable sealing performance of the sealing heat insulation assembly is guaranteed.

In some embodiments, the through hole is further provided with a one-way breathable film, and the one-way breathable film is arranged between the hole sealing seat and the sealing heat insulation assembly. The gas discharge of electric core inside that can be convenient for set up one-way ventilated membrane is discharged under the condition of not destroying explosion-proof valve, to internal gas, realizes from the exhaust function, prolongs the life-span of explosion-proof valve, promotes the security performance of battery.

In some embodiments, an observation hole is formed in the limiting groove, and a test gasket is further arranged between the sealing heat insulation assembly and the sealing cover. Through setting up the test gasket to and the observation hole, can reflect the gas leakage condition in the hole sealing lid through the test gasket before opening the hole sealing lid, learn in advance that gas leakage weeping condition takes place.

In some embodiments, the heat insulating gasket, the sealing gasket, the buffer gasket and the test gasket are integrally formed by integral hot pressing or circumferential bonding and sealing. The heat insulation gasket, the sealing gasket buffer gasket and the test gasket are sealed and formed, so that the installation and the replacement are convenient.

In some embodiments, the sealing and heat-insulating assembly is arranged on the inner side of the hole sealing cover, and the sealing and heat-insulating assembly is fixedly connected with the bottom wall of the limiting groove. The sealing heat insulation assembly is preset on the inner side of the hole sealing cover, and the installation can be completed by directly connecting the hole sealing cover with the hole sealing seat, so that the installation efficiency is improved.

In some embodiments, a pressure-reducing film layer is disposed on the through hole, and the pressure-reducing film layer is disposed at an end of the through hole facing the battery end cap. The pressure reduction film layer can effectively reduce the pressure generated in the liquid injection process of the battery and prevent the pole piece from wrinkling.

In some embodiments, the reduced pressure membrane layer is a porous elastomeric membrane layer. The porous elastic membrane layer is simple and convenient to manufacture, has a good pressure reduction effect, and can effectively prevent the damage to the pole piece caused by the pressure in the liquid injection process.

In some embodiments, the outer side of the sealing cover is also provided with a protective film wrapping the sealing cover. Set up the protection film and can effectively prevent that impurity from getting into the inside sealed inefficacy that leads to of handhole door.

In some embodiments, the protective film is made of a heat shrinkable film. The heat shrinkage film can wrap the hole sealing cover comprehensively under the heat effect, and good sealing and protecting effects are achieved.

In some embodiments, the hole sealing seat is in threaded connection with the cell end cover, and a sealing member is arranged between the hole sealing seat and the cell end cover. Through threaded connection, the installation and the replacement of the hole sealing seat can be facilitated, and the sealing performance between the hole sealing seat and the battery end cover can be ensured by the sealing element.

In some embodiments, the hole sealing seat and the cell end cover are of an integral structure. The long-term sealing performance between the hole sealing seat and the battery end cover can be ensured by the integrally formed structure, and the production can be facilitated.

In a second aspect, the present application provides an end cap assembly comprising the pour hole sealing means of the above embodiment, and the height of the pour hole sealing means is equal to or less than the height of the post of the end cap assembly.

In a third aspect, the present application provides a battery cell comprising the end cap assembly of the above embodiment.

In a fourth aspect, the present application provides a battery including the battery cell of the above embodiment.

In a fifth aspect, the present application provides an electric device, which includes the battery in the above embodiments, wherein 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

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

FIG. 1 is a schematic 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 view of a battery cell according to other embodiments of the present application;

FIG. 5 is a schematic structural view of an end cap assembly according to some embodiments of the present application;

FIG. 6 is an enlarged view of the pour hole sealing device shown in FIG. 5 at the circle frame A;

FIG. 7 is a schematic structural view of an end cap assembly according to further embodiments of the present application;

FIG. 8 is an enlarged view of the pour hole sealing device shown in FIG. 7 at the circle frame B.

Detailed description of the reference numerals

1000. A vehicle;

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

10. a box body; 11. a first portion; 12. a second portion;

20. a battery cell; 21. an end cap assembly; 22. a housing; 23. an electrical core assembly; 24. an explosion-proof valve; 25. an electrode terminal; 25a, a positive electrode terminal; 25b, negative electrode terminal

26. A liquid injection hole sealing device; 2601. a hole sealing seat; 2602. a hole sealing cover; 2603. sealing the heat insulation assembly; 2604. a connecting portion; 2605. a sealing part; 2606. a limiting groove; 2607. a fastening part; 2608. a positioning ring; 2609. a heat insulating spacer; 2610. sealing gaskets; 2611. a cushion pad; 2612. a through hole; 2613. a liquid injection hole; 2614. a unidirectional breathable film; 2615. testing the gasket; 2616. a pressure reducing film layer; 2617. a protective film; 2618. a seal member; 2619. and (4) external threads.

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 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; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In view of the development of market situation, the application of the power battery is more and more extensive. 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.

However, the liquid injection hole of the conventional power battery cannot realize the circular liquid supplement of the battery cell, and the battery cell reaches the use end point in advance along with the consumption of the electrolyte. Or after the battery core of some power batteries is subjected to primary liquid supplement through the liquid injection hole, the liquid injection hole cannot reach the standard mechanical strength, the explosion-proof pressure of the battery core is smaller than the development pressure of the explosion-proof valve, and the battery core cannot be applied in the original scene.

In the research process, the inventor finds that to effectively prolong the service life of the battery, the electrolyte of the battery core must be ensured to be supplemented in time. Utilize original notes liquid pore structure to carry out follow-up notes liquid and can match rather than with original notes liquid equipment on the battery, can promote and annotate liquid efficiency and convenience, also can keep the original structure of battery. In addition, in the liquid injection process, the electric core assembly can realize circulating liquid supplement in the using process and can realize automatic exhaust in the liquid supplement process.

However, the mechanical properties of the entire pour hole after the pouring is completed using the conventional pour hole become a new problem. If the mechanical explosion-proof strength of the liquid injection hole is smaller than the explosion-proof pressure of the explosion-proof valve, if the battery continues to work in the original electric equipment, the liquid injection hole is broken due to liquid leakage or too large pressure, so that the battery is possibly scrapped. In addition, in order to ensure the use safety and prevent the explosion of the electric core assembly from the liquid injection hole caused by overlarge internal pressure, the pressure intensity which can be borne after the liquid injection hole is sealed again must be larger than the design pressure of the explosion-proof valve.

Based on the above consideration, in order to realize multiple-cycle liquid replenishment of the battery and simultaneously ensure the sealing performance of the liquid filling hole, the inventor researches and designs a liquid filling hole sealing device, wherein the liquid filling hole sealing device is directly arranged on the liquid filling hole to seal the liquid filling hole, and the sealing performance of the liquid filling hole after liquid filling is finished is ensured.

The liquid injection hole sealing device in the embodiment of the application comprises a hole sealing seat, a hole sealing cover and a sealing heat insulation assembly. After the liquid filling hole sealing device is used, the sealing heat insulation assembly is fixed on the hole sealing seat by the hole sealing cover when the liquid filling hole is closed, when electrolyte needs to be filled, the hole sealing cover and the sealing heat insulation assembly are taken down from the hole sealing seat, the liquid filling device directly fills the liquid through the through hole, the through hole is communicated with the liquid filling hole, and the electrolyte of the battery core is supplemented. After the liquid injection is completed, the mechanical strength of the liquid injection hole can be ensured by sealing the sealing cover and the sealing heat-insulating assembly, so that the battery can continue to operate normally, and the problem that the battery core cannot be circularly replenished with liquid is solved. Meanwhile, in the process of fluid infusion, the exhaust of the battery core can be realized, and the battery can be prevented from exploding and firing due to excessive gas in the battery core.

The liquid injection hole sealing device disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited to. The power supply system who possesses this power consumption device of constitution such as end cover subassembly, battery monomer, battery that this application is disclosed can be used, like this, be convenient for electric core supply electrolyte, exhaust in the use, promote stability and the battery life 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 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, 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 includes 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 may be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells 20 is accommodated in the case 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 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 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. Referring to fig. 3, the battery cell 20 includes an end cap assembly 21, a housing 22, a battery cell assembly 23, and other functional components.

The end cap assembly 21 refers to a member that covers an opening of the case 22 to insulate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap assembly 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap assembly 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength, and the safety performance may be improved. The end cap assembly 21 may be provided with functional components such as the electrode terminals 25. The electrode terminals 25 may be used to electrically connect with the electric core assembly 23 for outputting or inputting electric power of the battery cells 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 end cap assembly 21. The material of the end cap assembly 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap assembly 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap assembly 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is a component for mating with the end cap assembly 21 to form the internal environment of the battery cell 20. The internal environment formed may be used to house, among other things, the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap assembly 21 may be separate components, and an opening may be provided in the housing 22, and the opening may be covered by the end cap assembly 21 to form the internal environment of the battery cell 20. Without limitation, the end cap assembly 21 and the housing 22 may be integrated, and specifically, the end cap assembly 21 and the housing 22 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 22, the end cap assembly 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 housing 22 may be determined according to the specific shape and size of the electric core 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 cell assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrical core assemblies 23 may be contained within the housing 22. The core assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive plate and the negative plate with the active materials form the main body part of the electric core assembly, and the parts of the positive plate and the negative plate without the active materials form the tabs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected with the electrode terminals to form a current loop.

Referring to fig. 4 to 8, fig. 4 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure, fig. 5 is a schematic structural diagram of an end cap assembly according to some embodiments of the present disclosure, fig. 6 is an enlarged schematic diagram of a liquid injection hole sealing device shown in fig. 5 at a circle frame a, and fig. 7 is a schematic structural diagram of an end cap assembly according to some other embodiments of the present disclosure; FIG. 8 is an enlarged view of the pour hole sealing device shown in FIG. 7 at the circle frame B.

As shown in the drawing, the end cap assembly 21 is provided with a positive electrode terminal 25a, a negative electrode terminal 25b, an explosion-proof valve 24, and a liquid injection hole 2613. The liquid injection hole 2613 is provided between the positive electrode terminal 25a and the explosion-proof valve 24. The pour hole sealing means 26 is provided on the pour hole 2613, and the pour hole sealing means 26 is provided relatively close to the positive electrode terminal 25 a.

Referring to fig. 6, the pour hole sealing device 26 in the embodiment of the present application includes: sealing seat 2601, sealing lid 2602 and sealed subassembly 2603 that insulates against heat. Specifically, the sealing seat 2601 is provided on the liquid injection hole 2613, the sealing seat 2601 includes a connecting portion 2604 and a sealing portion 2605 which are axially distributed one after another, the connecting portion 2604 is hermetically connected with the battery end cover assembly 21, the outer diameter of the sealing portion 2605 is larger than that of the connecting portion 2604, a through hole 2612 which penetrates through the connecting portion 2604 and the sealing portion 2605 is provided on the sealing seat 2601, and the through hole 2612 is communicated with the liquid injection hole 2613; the sealing cover 2602 is hermetically connected to the sealing portion 2605; the sealing and heat insulating assembly 2603 is disposed between the sealing seat 2601 and the sealing cover 2602, and the sealing and heat insulating assembly 2603 completely covers the through hole 2612. The sealing and heat insulating assembly 2603 is connected with the sealing portion 2605 in a sealing manner under the pressure action of the sealing cover 2602.

By arranging the sealing seat 2601 on the liquid injection hole 2613, the through hole 2612 on the sealing seat 2601 is communicated with the liquid injection hole 2613 for liquid injection, and the sealing and positioning functions of the sealing seat 2601 can facilitate the liquid injection of the liquid injection device. Meanwhile, the hole sealing seat 2601 can provide a larger space for the through hole 2612, and the hole diameters of the liquid injection hole 2613 and the through hole 2612 are enlarged, so that the flow rate and the efficiency of liquid injection are improved. The diameter of the liquid injection hole 2613 can be designed to be two to three times of the original diameter, the diameter of the through hole 2612 is designed to be the same as that of the liquid injection hole 2613, and the central axes of the liquid injection hole 2613 and the through hole 2612 are overlapped.

The hole sealing cover 2602 can also be designed to be disposable, and a new hole sealing cover 2602 and a sealing and heat insulating assembly 2603 which have the same structure as the original hole sealing cover 2602 can be replaced after liquid injection is completed, so that the performance of the sealing and heat insulating assembly 2603 and the rigidity and structural integrity of the hole sealing cover 2602 are ensured, and the heat insulating and sealing device 26 achieves the designed structural strength after the hole sealing cover 2602 is installed.

In the technical scheme of the embodiment of the application, the hole sealing seat 2601 is arranged above the liquid injection hole 2613 of the end cover of the battery 100, and the hole sealing cover 2602 and the sealing heat insulation assembly 2603 are correspondingly arranged. With such an arrangement, when the liquid injection hole 2613 is closed, the sealing and heat insulating assembly 2603 is fixed on the sealing seat 2601 by the sealing cover 2602, so that the sealing cover 2602 and the sealing seat 2601 can be conveniently installed while high mechanical strength is maintained; when electrolyte needs to be filled, the hole sealing cover 2602 and the sealing heat insulation assembly 2603 are taken down from the hole sealing seat 2601, the liquid injection device directly injects liquid through the through hole 2612, and the through hole 2612 is communicated with the liquid injection hole 2613, so that circulating liquid supplement of the electric core assembly 23 is realized. After the liquid injection is completed, the sealing cover 2602 and the sealing and heat insulating assembly 2603 are used for sealing, so that the sealing performance and the mechanical strength of the liquid injection hole 2613 can be ensured. In addition, the mechanical strength of the combination between the heat insulation assembly 2603 and the hole sealing seat 2601 must be greater than the explosion-proof pressure of the explosion-proof valve, so as to prevent the pressure in the electric core assembly from bursting at the liquid injection hole 2613, so that the battery 100 continues to operate normally, and the problem that the battery 100 cannot be cyclically replenished with liquid is solved.

In some embodiments of the present application, a limiting groove 2606 recessed toward the hole sealing seat 2601 is provided on an outer end surface of the hole sealing cover 2602, a cover edge of the hole sealing cover 2602 is inwardly contracted in a circumferential direction to form a buckling portion 2607, a bottom of the limiting groove 2606 is in sealing engagement with the sealing heat insulation assembly 2603, and the buckling portion 2607 is in sealing engagement with one side of the sealing portion 2605 facing the end cover.

Through setting up spacing recess 2606 and buckling parts 2607, seal heat-insulating subassembly 2603 and hole sealing seat 2601 along axial direction's both ends and seal, guarantee heat-insulating subassembly 2603 and hole sealing seat 2601's mechanical strength.

In some embodiments of the present application, the side of the sealing portion 2605 facing the liquid injecting hole 2613 has a protruding positioning ring 2608 surrounding the connecting portion 2604, the positioning ring 2608 is spaced from the connecting portion 2604, and the cover edge of the sealing cover 2602 is folded inward toward the limiting groove 2606, so that the end of the sealing cover 2602 wraps the positioning ring 2608.

By arranging the positioning ring 2608, the cover edge of the hole sealing cover 2602 is folded upwards, and the mechanical strength of the connection between the hole sealing cover 2602 and the hole sealing seat 2601 is further ensured.

In some embodiments of the present application, the sealed insulating assembly 2603 includes an insulating gasket 2609, a sealing gasket 2610, and a cushion gasket 2611 arranged in a stack. The heat insulating spacer 2609 is disposed toward the through hole 2612, the cushion spacer 2611 is disposed toward the stopper groove 2606, and the seal spacer 2610 is disposed between the heat insulating spacer 2609 and the cushion spacer 2611.

By the above technical solution, the heat insulating spacer 2609 is disposed toward the through hole 2612 to absorb heat, thereby preventing the hot air from damaging the sealing spacer 2610 and the buffer spacer 2611, and the sealing spacer 2610 is disposed to perform sealing and the buffer spacer 2611 to perform buffering, thereby realizing long-term sealing performance of the sealing heat insulating assembly 2603 and prolonging the service life of the sealing heat insulating assembly 2603.

In some embodiments, a unidirectional air-permeable membrane 2614 is further disposed on the through hole 2612, and the unidirectional air-permeable membrane 2614 is disposed between the sealing seat 2601 and the sealing and heat-insulating assembly 2603.

The gas flow direction of the unidirectional gas permeable membrane 2614 is set to flow from the inside of the cell to the outside. When the gas in the battery core needs to be discharged, the sealing cover 2602 and the sealing and heat-insulating assembly 2603 are removed, the battery 100 is left standing for 24 to 48 hours, the gas in the battery core assembly 23 can be discharged through the one-way breathable film 2614, and the external air cannot enter the battery core assembly 23.

Through set up one-way ventilated membrane 2614 on hole sealing seat 2601 can be convenient for the inside gas outgoing of electricity core subassembly, under the condition of not destroying explosion-proof valve 24, reduce the inside gas pressure of electricity core subassembly, the life-span of extension explosion-proof valve 24 promotes battery 100's security performance.

In some embodiments, a viewing aperture is formed in the retention groove 2606, and a test pad 2615 is disposed between the sealing and insulating assembly 2603 and the sealing cover 2602. The test pad 2615 can be a PH test paper, when the test pad 2615 is used, liquid is dripped onto the test pad 2615 through the observation hole, if air leaks or liquid leaks from the electric core group 23, leaked air is dissolved in water or the leaked liquid reacts with the PH test paper to present a corresponding color; if no air leakage or liquid leakage exists in the battery core, the PH test paper does not change color.

Through setting up test gasket 2615 and observation hole, can reflect the gas tightness condition in the hole sealing lid 2602 through test gasket 2615 before opening hole sealing lid 2602, learn in advance that the gas leakage weeping condition takes place, guarantee operating personnel's safety.

In some embodiments of the present application, the insulating spacer 2609, the sealing spacer 2610, the buffer spacer 2611 and the test spacer 2615 may be integrally formed by integral heat pressing or circumferential bonding and sealing. The heat insulation gasket 2609, the sealing gasket 2610, the buffer gasket 2611 and the test gasket 2615 are formed in a sealing mode, sealing performance is improved, and meanwhile installation and replacement are convenient.

In some embodiments of the present application, the sealing and insulating assembly 2603 is disposed inside the cover 2602, and the sealing and insulating assembly 2603 is fixedly attached to the bottom wall of the retention groove 2606. The sealing and heat insulating assembly 2603 is preset on the inner side of the hole sealing cover 2602, and the hole sealing cover 2602 is directly connected with the hole sealing seat 2601 during installation, so that the installation efficiency is improved.

In some embodiments, a pressure-reducing membrane 2616 is disposed on the through hole 2612, and the pressure-reducing membrane 2616 is disposed on one end of the through hole 2612 facing the end cap of the battery 100. The pressure reduction film 2616 can effectively reduce the pressure generated in the liquid injection process of the battery 100 and prevent the pole piece from wrinkling.

In some embodiments of the present application, the pressure-reduction membrane layer 2616 is a porous elastic membrane layer. The porous elastic membrane layer is simple and convenient to manufacture, has a good pressure reduction effect, and can effectively prevent the damage of the pressure in the liquid injection process to the battery pole piece.

According to some embodiments of the present application, a protective film 2617 wrapping the hole sealing cover 2602 is further disposed outside the hole sealing cover 2602. The protective film 2617 is arranged to effectively prevent impurities from entering the sealing cover 2602 to cause sealing failure.

In the embodiment of the present application, the protective film 2617 is made of a heat shrinkable film. The heat shrinkage film can wrap the hole sealing cover 2602 comprehensively under the heat effect, so that good sealing and protecting effects are realized.

In some embodiments, the sealed seat 2601 is screwed with the end cap of the battery 100, and a sealing member 2618 is disposed between the sealed seat 2601 and the end cap of the battery 100. Specifically, the outer wall of the connecting portion 2604 is provided with an external thread 2619, and the end cap of the battery 100 is provided with an internal thread which is matched with the external thread 2619 of the connecting portion 2604 at a position corresponding to the liquid injection hole 2613. The connecting part 2604 is screwed with the end cap of the battery 100, and a sealing member 2618 is arranged outside the connecting part 2604 to improve the air tightness of the screwed connection.

The installation and replacement of the hole sealing seat 2601 can be facilitated by the screw connection, and the sealing member 2618 can ensure the sealing performance between the hole sealing seat 2601 and the end cap of the battery 100.

In some embodiments of the present application, as shown in fig. 7 and 8, the sealed seat 2601 is integrally formed with the end cap of the battery 100. The mechanical strength of the combination between the hole sealing seat 2601 and the battery end cover assembly 21 can be ensured by the integrally formed structure, and the production can be facilitated. In addition, when the sealing seat 2601 is integrally formed with the end cap of the battery 100, good sealing can be achieved without the need for the sealing member 2618.

According to some embodiments of the present application, there is also provided an end cap assembly 21 comprising a pour hole sealing device 26 according to any of the above aspects. And the height of the pour hole sealing means 26 is set to be equal to or lower than the height of the post of the cap assembly 21.

According to some embodiments of the present application, there is also provided a battery 100 including the battery 100 cell described in any of the above aspects.

According to some embodiments of the present application, there is also provided an electrical device, including the battery 100 according to any of the above aspects, and the battery 100 is used for providing electrical energy for the electrical device. The powered device may be any of the aforementioned devices or systems that employ battery 100.

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 liquid injection hole sealing device for sealing a liquid injection hole on a battery end cover is characterized by comprising

The hole sealing seat is arranged on the liquid injection hole and comprises a connecting part and a sealing part which are axially distributed successively, the connecting part is connected with the battery end cover in a sealing way, the outer diameter of the sealing part is larger than that of the connecting part, a through hole penetrating through the connecting part and the sealing part is arranged on the hole sealing seat, and the through hole is communicated with the liquid injection hole;

a sealing cover connected with the sealing part in a sealing way;

the sealing and heat-insulating assembly is arranged between the hole sealing seat and the hole sealing cover and completely covers the through hole;

wherein the sealing and heat-insulating assembly is in sealing connection with the sealing part under the pressure action of the sealing cover.

2. The liquid filling hole sealing device according to claim 1, wherein a limiting groove is formed on an outer end face of the sealing cover and is recessed towards the sealing seat, a cover edge of the sealing cover is inwardly folded along a circumferential direction to form a buckling part, a bottom of the limiting groove is in sealing fit with the sealing heat insulation assembly, and the buckling part is in sealing fit with one side, facing towards the end cover, of the sealing part.

3. The pour spout sealing device of claim 2, wherein the sealing portion has a protruding retaining ring surrounding the connecting portion on a side thereof facing the pour spout, the retaining ring being spaced apart from the connecting portion, and a rim of the pour spout cover being received in the retaining groove such that an end of the pour spout cover is wrapped around the retaining ring.

4. The pour spout sealing device of claim 3, wherein the heat and seal assembly includes a heat insulating gasket, a sealing gasket, and a cushion gasket, which are stacked, and the heat insulating gasket is disposed toward the through hole.

5. The liquid filling hole sealing device according to claim 4, wherein a one-way gas permeable membrane is further provided on the through hole, and the one-way gas permeable membrane is provided between the hole sealing seat and the sealing and heat insulating assembly.

6. The pour hole sealing device according to claim 5, wherein a viewing hole is formed in the limiting groove, and a testing gasket is further disposed between the sealing and heat insulating assembly and the cover.

7. The liquid inlet sealing device according to claim 6, wherein the heat insulating gasket, the sealing gasket, the buffer gasket and the test gasket are integrally formed by integral hot pressing or circumferential bonding and sealing.

8. The pour hole sealing device according to claim 7, wherein the heat-sealing and heat-insulating assembly is disposed inside the cover, and the heat-sealing and heat-insulating assembly is fixedly connected to the bottom wall of the limiting groove.

9. The pour hole sealing device according to claim 2, wherein a pressure-reducing film layer is provided on the through hole, and the pressure-reducing film layer is provided at an end of the through hole facing the battery end cap.

10. The pour hole sealing device according to claim 9, wherein the pressure-reducing membrane layer is a porous elastic membrane layer.

11. The pour hole sealing device according to claim 2, wherein a protective film is further provided on the outer side of the cover for sealing the pour hole.

12. The pour hole sealing device according to claim 11, wherein the protective film is made of a heat-shrinkable film.

13. The pour hole sealing device according to claim 1, wherein the seal hole seat is in threaded connection with the battery end cover, and a sealing member is arranged between the seal hole seat and the battery end cover.

14. The pour spout sealing device of claim 1, wherein the pour spout base is of an integrally formed construction with the battery end cap.

15. An end cap assembly comprising a pour hole sealing means according to any one of claims 1 to 14, and having a height equal to or less than the height of the post of the end cap assembly.

16. A battery cell comprising the end cap assembly of claim 15.

17. A battery comprising the cell of claim 16.

18. An electrical consumer, characterized in that the consumer comprises a battery according to claim 17 for providing electrical energy.