阅读说明：本技术 端盖组件、电池单体、电池及用电设备 (End cover assembly, battery monomer, battery and consumer ) 是由 杨晨林 杜国栋 于 2021-03-25 设计创作，主要内容包括：本申请涉及一种端盖组件、电池单体、电池及用电设备,属于电池技术领域。该端盖组件,用于电池单体,端盖组件包括端盖,端盖上开设有用于向电池单体的内部注入液体的注液孔；注液阀,用于安装在注液孔处,注液阀包括阀体和单向阀芯,阀体具有注液通道,单向阀芯连接于阀体,单向阀芯被配置为允许液体从注液通道流入电池单体的内部,而阻止液体从电池单体的内部流出；单向阀芯包括多个阀瓣,多个阀瓣沿注液通道的周向分布,多个阀瓣共同阻隔注液通道和电池单体的内部,每个阀瓣被配置为可朝向电池单体的内部单向打开。该端盖组件,保证注液孔处的密封性,保证电池单体清洁,提高电池单体的安全性。(The application relates to an end cover assembly, a single battery, a battery and electric equipment, and belongs to the technical field of batteries. The end cover assembly is used for a single battery and comprises an end cover, wherein a liquid injection hole for injecting liquid into the single battery is formed in the end cover; the liquid injection valve is used for being installed at the liquid injection hole and comprises a valve body and a one-way valve core, the valve body is provided with a liquid injection channel, the one-way valve core is connected to the valve body, and the one-way valve core is configured to allow liquid to flow into the interior of the single battery from the liquid injection channel and prevent the liquid from flowing out of the interior of the single battery; the one-way valve core comprises a plurality of valve clacks, the valve clacks are distributed along the circumferential direction of the liquid injection channel, the valve clacks jointly obstruct the liquid injection channel and the interior of the battery monomer, and each valve clack is configured to be opened towards the interior of the battery monomer in a one-way mode. This end cover subassembly guarantees the leakproofness of notes liquid hole department, guarantees that battery monomer is clean, improves battery monomer's security.)

1. An end cap assembly for a battery cell, the end cap assembly comprising:

the end cover is provided with a liquid injection hole for injecting liquid into the battery monomer;

the liquid injection valve is used for being installed at the liquid injection hole and comprises a valve body and a one-way valve core, the valve body is provided with a liquid injection channel, the one-way valve core is connected to the valve body, and the one-way valve core is configured to allow liquid to flow into the interior of the battery cell from the liquid injection channel and prevent the liquid from flowing out of the interior of the battery cell;

the one-way valve core comprises a plurality of valve clacks, the valve clacks are distributed along the circumferential direction of the liquid injection channel, the valve clacks jointly obstruct the liquid injection channel and the interior of the battery monomer, and each valve clack is configured to be opened towards the interior of the battery monomer in a one-way mode.

2. An end cap assembly according to claim 1, wherein each valve flap is connected at one end to the valve body and at the other end is a free end.

3. The end cap assembly of claim 2, wherein one end of the valve flap is connected to an end of the valve body near the interior of the battery cell, and wherein two sides of each valve flap along the circumferential direction of the liquid injection channel are configured to respectively sealingly abut adjacent valve flaps, such that the valve flaps enclose a chamber in communication with the liquid injection channel.

4. An end cap assembly according to claim 3, wherein the cross-sectional area of the chamber decreases along a centerline of the liquid injection channel towards the interior of the battery cell.

5. An end cap assembly according to claim 4, wherein the valve flaps are isosceles triangles and comprise a first edge and two second edges of equal length, the first edge being connected to the valve body and the second edges of two adjacent valve flaps abutting each other.

6. An end cap assembly according to any one of claims 1 to 5, wherein an annular groove is provided on the outer peripheral surface of the valve body for allowing the valve body to be snapped into the liquid injection hole.

7. The end cap assembly of any of claims 1-5, wherein the valve body is integrally formed with the check valve cartridge.

8. An end cap assembly according to any one of claims 1 to 5, wherein the valve body is provided with a gas suction hole for balancing gas pressure inside and outside the battery cell.

9. The end cap assembly of claim 8, wherein the air suction hole is in communication with the liquid injection channel.

10. The end cap assembly of claim 9, wherein a centerline of the air suction hole intersects a centerline of the liquid injection channel.

11. The end cap assembly of claim 10, wherein a centerline of the air suction hole is perpendicular to a centerline of the liquid injection channel.

12. An end cap assembly according to claim 9, wherein the projection of the suction orifice does not extend beyond the projection of the centerline of the charge channel in a plane perpendicular to the centerline of the charge channel.

13. An end cap assembly according to claim 8, wherein the air suction hole has a first end for communicating with the interior of the battery cell and a second end for communicating with the exterior of the battery cell, the air suction hole having a flow cross-section that gradually decreases from the first end to the second end.

14. The end cap assembly of claim 8, wherein the gas suction holes are provided in a plurality, the plurality of gas suction holes being circumferentially arrayed about a centerline of the liquid injection channel.

15. A battery cell, comprising:

a housing having an end opening;

the end cap assembly of any one of claims 1-14, the end cap configured to cover the end opening.

16. A battery comprising the cell of claim 15.

17. An electrical device comprising the battery of claim 16.

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery monomer, a battery and electric equipment.

Background

The lithium ion battery has the advantages of high voltage, high specific energy, more recycling times, long storage time and the like, and is widely applied to portable electronic equipment and large-scale electric equipment such as electric automobiles and the like. The electrolyte is responsible for the transmission of lithium ions between a positive electrode and a negative electrode in the lithium ion battery and is an important component of the lithium ion battery.

In the related technology, in the production process of the battery, the electrolyte is easy to overflow from the liquid injection hole, so that the single battery is polluted, and the safety of the single battery is influenced.

Disclosure of Invention

An object of this application provides an end cover subassembly, battery monomer, battery and consumer, guarantees the leakproofness of notes liquid hole department, guarantees that battery monomer is clean, improves the free security of battery.

The application is realized by the following technical scheme:

in a first aspect, the present application provides an end cap assembly for a battery cell, the end cap assembly comprising:

the end cover is provided with a liquid injection hole for injecting liquid into the battery monomer;

the liquid injection valve is used for being installed at the liquid injection hole and comprises a valve body and a one-way valve core, the valve body is provided with a liquid injection channel, the one-way valve core is connected to the valve body, and the one-way valve core is configured to allow liquid to flow into the interior of the single battery from the liquid injection channel and prevent the liquid from flowing out of the interior of the single battery;

the one-way valve core comprises a plurality of valve clacks, the valve clacks are distributed along the circumferential direction of the liquid injection channel, the valve clacks jointly obstruct the liquid injection channel and the interior of the battery monomer, and each valve clack is configured to be opened towards the interior of the battery monomer in a one-way mode.

According to the end cover assembly of the embodiment of the application, the liquid injection valve is installed at the liquid injection hole, through the one-way circulation function of the one-way valve core of the liquid injection valve, when liquid is injected into the interior of the battery monomer (for short, liquid injection), the liquid is allowed to flow into the interior of the battery monomer from the liquid injection channel, and when the liquid is not injected, the liquid injection valve can block the liquid in the interior of the battery monomer, so that the liquid is prevented from flowing out of the interior of the battery monomer, and the cleanness of the battery monomer is guaranteed. Through the cooperation of a plurality of valve clacks, realize the separation of liquid, simple structure opens and closes the convenience.

In some embodiments of the present application, one end of each valve flap is connected to the valve body and the other end is a free end.

In the scheme, the connection form of the valve clack and the valve body is simple in structure, and the opening or closing of the one-way valve core is realized through the form change of the valve clack.

In some embodiments of the present application, one end of the valve flap is connected to one end of the valve body close to the interior of the battery cell, and two sides of each valve flap along the circumferential direction of the liquid injection channel are configured to be respectively and sealingly attached to adjacent valve flaps, so that the valve flaps enclose a chamber communicated with the liquid injection channel.

In the above scheme, the connection position of the valve clack and the valve body enables the liquid injection channel to have a longer size, so that liquid can accumulate larger pressure in the liquid injection channel conveniently, and the impact force for opening the valve clack is reduced.

In some embodiments of the present application, the cross-sectional area of the chamber gradually decreases toward the interior of the battery cell along the centerline of the liquid injection channel.

In the above-described solution, the chamber is constructed in such a way that a relatively large pressure is generated in the region of the flap.

In some embodiments of the present application, the valve flap is an isosceles triangle, the valve flap includes a first edge and two second edges having equal lengths, the first edge is connected to the valve body, and the second edges of two adjacent valve flaps are abutted to each other.

In the above scheme, the shape setting of valve clack guarantees that a plurality of valve clacks are laminated closely, guarantees check valve core's sealed effect.

In some embodiments of the present application, an annular groove is provided on the outer circumferential surface of the valve body, and the annular groove is used for allowing the valve body to be clamped in the liquid injection hole.

In the above scheme, the installation of the liquid injection valve at the liquid injection hole is convenient to realize due to the arrangement of the annular groove, and the fixation of the liquid injection valve and the end cover is ensured to be firm.

In some embodiments of the present application, the valve body is integrally formed with the check valve cartridge.

In the above scheme, the integrated into one piece structure of notes liquid valve, the processing of being convenient for, the bulk strength is high, and the leakproofness is good.

In some embodiments of the present application, the valve body is provided with a suction hole for balancing air pressure inside and outside the battery cell.

In the above scheme, the air suction holes are arranged to realize the communication between the inside and the outside of the single battery so as to balance the air pressure between the inside and the outside of the single battery.

In some embodiments of the present application, the suction port communicates with the liquid injection channel.

In the above scheme, the air suction hole is communicated with the liquid injection channel, the structure is simple, and the gas circulation is good.

In some embodiments of the present application, a centerline of the suction hole intersects a centerline of the liquid injection channel.

In the scheme, the length of the air suction hole is short, so that the circulation of air is convenient to realize.

In some embodiments of the present application, a centerline of the suction hole is perpendicular to a centerline of the liquid injection channel.

In the above scheme, the air suction holes are arranged in a manner of being convenient to process, and the air suction holes are shortest in length and convenient to realize the circulation of air.

In some embodiments of the present application, the projection of the suction orifice does not extend beyond the projection of the centerline of the liquid injection channel in a plane perpendicular to the centerline of the liquid injection channel.

In the above scheme, it can be understood that the centerline of the air suction hole does not intersect with the centerline of the liquid injection channel, the length of the air suction hole is long, and the liquid mixture discharged from the air suction hole can flow on the inner wall of the liquid injection channel, so that the liquid is prevented from being discharged from the air suction hole.

In some embodiments of the present application, the suction hole has a first end for communicating with the inside of the battery cell and a second end for communicating with the outside of the battery cell, and a flow cross section of the suction hole is gradually reduced from the first end to the second end.

In the above scheme, the structural style of the air suction holes is convenient for gas to be discharged from the inside of the battery cell to the outside, the electrolyte is not easy to be discharged, and meanwhile, external impurities are not easy to enter the inside of the battery cell through the air suction holes.

In some embodiments of the present application, the gas suction holes are provided in a plurality, the plurality of gas suction holes being circumferentially arrayed about a centerline of the liquid injection channel.

In above-mentioned scheme, the quantity of suction opening is a plurality of, can improve the gas flow efficiency between the inside of battery monomer and the outside, is convenient for balance battery monomer's inside and outside atmospheric pressure.

In a second aspect, the present application also provides a battery cell, including:

a housing having an end opening;

the above end cap assembly, the end cap configured to cover the end opening.

In a third aspect, the present application also provides a battery, including the above battery cell.

In a fourth aspect, the present application further provides an electric device including the battery.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure;

fig. 2 is a structural diagram of a battery according to an embodiment of the present application;

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

FIG. 4 is a top view of an end cap assembly provided in accordance with an embodiment of the present application;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is an enlarged view of FIG. 5 at B;

FIG. 7 is a cross-sectional view of a charge valve according to one embodiment of the present application;

FIG. 8 is an isometric view of a fill valve provided in accordance with another embodiment of the present application;

FIG. 9 is a schematic view of the combination of the valve flap and the valve body of the liquid injection valve according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a valve flap and valve body combination of a liquid injection valve according to another embodiment of the present application;

FIG. 11 is a schematic view of a valve flap according to an embodiment of the present disclosure;

FIG. 12 is a schematic view of the air intake of a charge valve according to an embodiment of the present application;

FIG. 13 is a schematic view of the communication between the air intake port and the filling passage of the filling valve according to one embodiment of the present application;

FIG. 14 is a schematic view of a suction port and a fluid injection channel in accordance with an embodiment of the present disclosure;

FIG. 15 is a schematic view of a suction port and a filling channel according to another embodiment of the present disclosure;

FIG. 16 is a cross-sectional view taken along line C-C of FIG. 12;

FIG. 17 is a schematic view of the non-communication between the air intake hole and the filling channel of the filling valve according to an embodiment of the present application;

FIG. 18 is a schematic structural view of a suction hole according to an embodiment of the present application.

Icon: 100-a battery; 101-a box body; 1011-first part; 1012-second part; 1-a battery cell; 10-an end cap assembly; 11-end cap; 110-liquid injection port; 1101-a limit convex ring; 111-liquid injection hole; 112-a first side; 113-a second face; 12-a liquid injection valve; 121-a valve body; 1211-an injection channel; 1212 — an annular groove; 1213-suction holes; 12131-first end; 12132-second end; 122-one-way valve core; 1221-valve flap; 12211 — first edge; 12212-a second edge; 1222-a chamber; 13-an electrode terminal; 14-an electrode assembly; 15-a housing; 200-a controller; 300-a motor; 1000-vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

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 in the description of the application 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.

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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are used only for convenience in describing the present application and for simplification of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

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

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the mass flow body protrusion in the mass flow body of the anodal active substance layer of coating has not coated the anodal active substance layer, and the mass flow body of the anodal active substance layer of coating is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like.

At present, liquid injection, formation and liquid supplementation are important processes related to electrolyte in the production process of lithium ion batteries. The inventor researches and discovers that in the processes of liquid injection, formation and liquid replenishment, the electrolyte flows back into the liquid injection cup, in the formation air suction device or overflows from the liquid injection hole due to the alternate circulation of positive and negative pressures in the internal space of the battery, the formation air generation and the like, and then the electrolyte is retained at the liquid injection hole to pollute a battery monomer. For example, in secondary liquid injection, due to limited liquid injection operation time, a part of non-soaked electrolyte in the battery cell in a micro-positive pressure state after liquid injection is discharged through the liquid injection hole, so that the electrolyte flows back into the liquid injection cup, the part of electrolyte cannot completely enter the interior of the battery cell when the liquid injection nozzle leaves, and the remaining electrolyte directly flows around the liquid injection hole after the liquid injection nozzle leaves, so that the battery cell is polluted, for example, an end cover is corroded, the appearance is affected, the electrolyte easily enters a connecting gap between an electrode terminal and the end cover, and further, the electrode terminal and the end cover are short-circuited, and the safety of the battery cell is affected.

In view of this, this application provides a technical scheme, through set up the liquid filling valve in the notes liquid hole department of end cover, the liquid filling valve has one-way case, based on the function that one-way case restricted liquid (for example, electrolyte, water etc.) one-way circulation, can effectively solve the security problem that liquid spills over the initiation at the notes liquid hole department. For example, by the one-way flow function of the one-way valve core of the liquid injection valve, when injecting liquid (i.e. injecting electrolyte into the interior of the battery cell), the electrolyte is allowed to flow into the interior of the battery cell from the liquid injection channel; when the non-liquid injection state, annotate the liquid valve and can block the inside electrolyte of battery monomer, prevent that electrolyte from following the inside outflow of battery monomer, guarantee that battery monomer is clean, and then guarantee the free assembly leakproofness of battery, improve the free security of battery. For convenience of description in the following, the liquid in the embodiments of the present application is illustrated by taking an electrolyte as an example.

The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, for example, the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may also be applied to all devices using batteries, and for brevity of description, the following embodiments are all described by taking an electric vehicle as an example.

For example, fig. 1 shows a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application, where the vehicle 1000 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The battery 100 is provided inside the vehicle 1000. For example, the battery 100 may be provided at the bottom or the head or tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operation power supply of the vehicle 1000 for a circuit system of the vehicle 1000, for example, for power demand for operation in starting, navigation, and running of the vehicle 1000. In another embodiment of the present application, the battery 100 may be used not only as an operation 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 force for the vehicle 1000.

The motor 300 and the controller 200 may be further disposed inside the vehicle 1000, and the controller 200 is used to control the battery to supply power to the motor 300, for example, for starting, navigation and operation power demand of the vehicle 1000 during traveling.

In order to meet different power requirements, the battery 100 may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. The battery 100 may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form the battery 100. That is, a plurality of battery cells may directly constitute the battery 100, or a battery module may be first constituted and then the battery 100 may be constituted.

Fig. 2 shows a schematic structural diagram of the battery 100 according to an embodiment of the present application. In fig. 2, the battery 100 includes a case 101 and a plurality of battery cells 1, the case 101 has a hollow structure, and the plurality of battery cells 1 are accommodated in the case 101.

The case 101 includes a first portion 1011 and a second portion 1012, the first portion 1011 includes a receiving space with an opening, and the second portion 1012 is used for covering the opening of the receiving space to form a receiving cavity for receiving the plurality of battery cells 1 in connection with the first portion 1011.

Fig. 3 shows an exploded view of the battery cell 1 according to an embodiment of the present application. In fig. 3, the battery cell 1 includes a case 15, an end cap assembly 10, an electrode terminal 13, and an electrode assembly 14.

The case 15 has an opening so that the electrode assembly 14 is received inside the case 15. The case 15 is determined according to the shape of one or more electrode assemblies 14, and for example, the case 15 may be a hollow rectangular parallelepiped or a hollow square or a hollow cylinder. For example, as shown in fig. 3, the housing 15 is a hollow rectangular parallelepiped. The housing 15 may be made of a material of conductive metal or plastic, alternatively, the housing 15 is made of aluminum or aluminum alloy.

The end cap assembly 10 includes an end cap 11 and a filling valve 12. The end cap 11 is used to cover an opening provided in the case 15 to form a cavity with the case 15 for accommodating the electrode assembly 14. The end cap 11 is provided with a liquid inlet for injecting a liquid (e.g., an electrolyte) into the interior of the battery cell 1 (the interior of the case 15). The filling valve 12 is intended to be mounted at the filling opening.

Two electrode terminals 13 are provided, two electrode terminals 13 are provided on the end cap 11, and the two electrode terminals 13 are a positive electrode terminal and a negative electrode terminal, respectively. The electrode assembly 14 has a positive electrode tab to which a positive electrode terminal is connected and a negative electrode tab to which a negative electrode terminal is connected.

FIG. 4 illustrates a top view of the end cap assembly 10 of an embodiment of the present application; FIG. 5 shows a cross-sectional view in the direction A-A of FIG. 4; fig. 6 shows an enlarged view at B of fig. 5. In some embodiments of the present application, as shown in fig. 4 to fig. 6, the end cap 11 is provided with a liquid injection port 110, a limiting convex ring 1101 is disposed in the liquid injection port 110, the limiting convex ring 1101 defines a liquid injection hole 111, the liquid injection hole 111 is used for injecting electrolyte into the interior of the battery cell 1 (shown in fig. 3), the liquid injection valve 12 is used for being installed at the liquid injection hole 111, and the liquid injection valve 12 is configured to be clamped to the limiting convex ring 1101 to ensure the installation stability and the sealing performance of the liquid injection valve 12 and the end cap 11. The liquid injection valve 12 is provided in the liquid injection port 110, and can function to seal the liquid injection hole 111 and facilitate the injection of the electrolyte into the battery cell 1.

As shown in fig. 4-6, the end cap 11 has a first face 112 and a second face 113 that are disposed opposite to each other, the first face 112 facing the electrode assembly 14, the second face 113 facing away from the electrode assembly 14, the pouring outlet 110 extending from the second face 113 to the first face 112, and an end face of the pouring valve 12 that faces away from the end of the electrode assembly 14 being located between the second face 113 and the first face 112. In this case, a metal sheet (not shown) may be placed over the filling valve 12 and welded to the end cap 11 to seal the filling opening 110. it will be appreciated that in the filling opening 110, an installation space is left between the first surface 112 and the filling valve 12 to accommodate the metal sheet which is welded to the end cap 11 to seal the filling opening 110. The metal sheet seals the liquid injection port 110, so that electrolyte leakage caused by loosening of the liquid injection valve 12 in the using process can be avoided, and the safety of the single battery 1 is ensured. It should be noted that the upper side of the filling valve 12 may be understood as the side of the filling valve 12 facing away from the electrode assembly 14, and correspondingly, the lower side of the filling valve 12 may be understood as the side of the filling valve 12 facing towards the electrode assembly 14.

FIG. 7 shows a cross-sectional view of the charge valve 12 according to an embodiment of the present application. As shown in fig. 7, the liquid filling valve 12 includes a valve body 121 and a one-way valve member 122, the valve body 121 has a liquid filling passage 1211, the one-way valve member 122 is connected to the valve body 121, and the one-way valve member 122 is configured to allow liquid to flow from the liquid filling passage 1211 into the interior of the battery cell 1, but prevent liquid from flowing out from the interior of the battery cell 1. When liquid needs to be injected into the interior of the battery cell 1, the liquid injection device is matched with the liquid injection valve 12, and the one-way valve core 122 is configured to be opened to allow the electrolyte to flow into the interior of the battery cell 1 from the liquid injection channel 1211; when liquid injection into the interior of the battery cell 1 is not required, the check valve 122 is configured to be closed to prevent the electrolyte from flowing out from the interior of the battery cell 1.

According to the end cover assembly 10 of the embodiment of the application, the end cover assembly is used for the battery unit 1, the liquid injection valve 12 is installed at the liquid injection hole 111 in a sealing mode, the liquid injection channel 1211 of the liquid injection valve 12 is used for being communicated with the interior of the battery unit 1 when the one-way valve core 122 is opened, electrolyte is injected into the interior of the battery unit 1 through the cooperation of the liquid injection valve 12 and a liquid injection device, and the liquid injection valve 12 can guarantee the sealing performance of the liquid injection hole 111. For example, at the time of liquid injection, the electrolyte is allowed to flow from the liquid injection passage 1211 into the interior of the battery cell 1 by the one-way flow-through function of the one-way spool 122 of the liquid injection valve 12; when the liquid state is not annotated, annotate liquid valve 12 and can block the electrolyte of the inside of battery monomer 1, prevent that electrolyte from flowing out from the inside of battery monomer 1, guarantee that battery monomer 1 is clean, and then guarantee the assembly leakproofness of battery monomer 1, improve battery monomer 1's security.

In some embodiments of the present application, as shown in fig. 7, an annular groove 1212 is provided on the outer peripheral surface of the valve body 121, the annular groove 1212 is configured to match with the stopper convex ring 1101 (shown in fig. 6), and the annular groove 1212 is used for allowing the valve body 121 to be clamped in the liquid injection hole 111. When the valve body 121 is clamped on the limiting convex ring 1101 through the annular groove 1212, the valve body 121 is sealed with the end cover 11, and the installation of the liquid injection valve 12 at the liquid injection hole 111 is facilitated due to the arrangement of the annular groove 1212, so that the liquid injection valve 12 is ensured to be fixed firmly with the end cover 11.

In some embodiments of the present application, as shown in fig. 7, the one-way valve core 122 includes a plurality of valve flaps 1221, the plurality of valve flaps 1221 are distributed along a circumferential direction of the liquid injection channel 1211, the plurality of valve flaps 1221 together block the liquid injection channel 1211 and an interior of the battery cell 1 to disconnect the liquid injection channel 1211 and the interior of the battery cell 1, and each valve flap 1221 is configured to be opened in one direction toward the interior of the battery cell 1.

It can be understood that a plurality of valve flaps 1221 are distributed around the circumference of the liquid injection channel 1211, and the plurality of valve flaps 1221 cooperate to make the check valve core 122 in a closed state in a normal state, and block the liquid injection channel 1211 and the inside of the battery cell 1; when the open condition is reached, each valve flap 1221 can be opened unidirectionally toward the interior of the battery cell 1, and the one-way valve element 122 is switched from the closed state to the open state to allow the liquid to flow into the interior of the battery cell 1 through the liquid injection passage 1211. Through the cooperation of a plurality of valve clacks 1221, realize the separation of liquid, simple structure opens and closes the convenience.

For example, when the liquid injection nozzle of the liquid injection device is matched with the valve body 121, the battery cell 1 is injected through the liquid injection passage 1211, and the valve clack 1221 of the one-way valve core 122 is deformed and opened under the action of positive pressure, so that the electrolyte enters the interior of the battery cell 1; when the liquid injection is finished and the air extraction is performed, the interior of the battery cell 1 is in a positive pressure state, and the one-way valve element 122 is closed to prevent the backflow of the electrolyte.

In some embodiments of the present application, as shown in fig. 7, each flap 1221 is attached to the valve body 121 at one end and is free at the other end. The connection form of the valve clack 1221 and the valve body 121 is simple in structure, and the opening or closing of the one-way valve element 122 is realized through the form change of the valve clack 1221.

It should be noted that, one end of the valve flap 1221 is connected with the valve body 121, and may be formed by integrally forming the valve flap 1221 and the valve body 121, or may be formed by separately arranging the valve flap 1221 and the valve body 121, and the two are welded, bonded, or riveted, etc. to ensure the connection sealing property between the two.

In some embodiments of the present application, the valve body 121 is integrally formed with the check valve spool 122. It can be understood that the liquid injection valve 12 is an integrally formed structure, and has the advantages of convenient processing, high overall strength and good sealing performance.

It should be noted that the one-way valve element 122 is self-sealing. The one-way valve element 122 may be made of a flexible material, such as rubber, and in an initial state, the one-way valve element 122 is in a closed state to block the liquid injection channel 1211 and the inside of the battery cell 1. When the valve flap 1221 is subjected to an impact force and the impact force is greater than the opening pressure of the valve flap 1221, the free end of the valve flap 1221 can deform with respect to the connection end (the end connected to the valve body 121), the plurality of valve flaps 1221 open, and the liquid injection passage 1211 communicates with the interior of the battery cell 1; when the valve flaps 1221 are subjected to an impulsive force smaller than the opening pressure of the valve flaps 1221, the valve flaps 1221 can be restored to the original state, and the valve flaps 1221 are closed to have self-sealing properties to block the interior of the liquid injection passage 1211 and the battery cell 1.

The structure of the check valve body 122 is various, for example, as shown in fig. 7, it can be understood that a plurality of valve flaps 1221 are located on the same plane, and the valve flaps 1221 extend in a direction perpendicular to the direction in which the liquid injection passage 1211 extends. The valve flaps 1221 are hermetically attached to the adjacent valve flaps 1221, and in a normal state, the valve flaps 1221 cooperate to jointly block the interior of the liquid injection channel 1211 and the interior of the battery cell 1; for another example, fig. 8 shows an axial view of the liquid injection valve 12 according to an embodiment of the present application, and as shown in fig. 8, the plurality of valve flaps 1221 enclose a curved surface, for example, the extending direction of the valve flaps 1221 forms an angle with the extending direction of the liquid injection passage 1211.

Fig. 9 shows a schematic view of the valve flap 1221 of the liquid filling valve 12 according to the embodiment of the present application in combination with the valve body 121. In some embodiments of the present application, as shown in fig. 8 and 9, one end of the valve flaps 1221 is connected to one end of the valve body 121 close to the inside of the battery cell 1 (shown in fig. 3), and both sides of each valve flap 1221 along the circumferential direction of the liquid injection channel 1211 are configured to be sealingly attached to the adjacent valve flaps 1221, respectively, so that the plurality of valve flaps 1221 enclose the chamber 1222 communicating with the liquid injection channel 1211. The valve flap 1221 is connected to the valve body 121 at a position such that the liquid injection passage 1211 has a longer size, which facilitates the accumulation of a greater pressure of the electrolyte in the liquid injection passage 1211 to reduce the impact force for opening the valve flap 1221; and the electrolyte remained after the liquid injection is completed can be conveniently contained, the cleaning is convenient, the contact of the electrolyte and the end cover 11 is avoided, and the electrolyte cannot flow to the connecting gap between the electrode terminal 13 and the end cover 11.

In some embodiments of the present application, as shown in fig. 9, the cross-sectional area of the chamber 1222 is gradually reduced toward the inside of the battery cell 1 along the center line X of the liquid injection channel 1211. It should be noted that the cross-sectional area of the chamber 1222 refers to the area of the cross-section of the chamber 1222 perpendicular to the centerline X of the liquid injection channel 1211. It can be understood that the area of the cross-section of the chamber 1222 perpendicular to the center line X of the liquid injection channel 1211 in the direction toward the inside of the battery cell 1 along the center line X of the liquid injection channel 1211 gradually decreases, facilitating the accumulation of liquid in the area of the valve flap 1221 to generate a greater pressure in the area of the valve flap 1221, reducing the impact force for opening the valve flap 1221.

It is noted that the cross-sectional shape of the liquid injection passage 1211 may be a regular shape, for example, a circle, a square, an ellipse, or the like; the cross-sectional shape of the liquid injection passage 1211 may also be irregular.

The chamber 1222 may have various structures, for example, as shown in fig. 9, the chamber 1222 has a tapered structure, the valve flap 1221 has a larger dimension in the extending direction of the central line X of the liquid filling channel 1211, the chamber 1222 is easy to accumulate liquid, which facilitates the liquid to generate a larger pressure in the area of the valve flap 1221, and reduces the impact force for opening the valve flap 1221; for another example, fig. 10 shows a schematic diagram of the combination of the valve flap 1221 and the valve body 121 of the liquid injection valve 12 according to another embodiment of the present invention, as shown in fig. 10, the structural form of the chamber 1222 is a hemisphere, and the dimension of the valve flap 1221 in the extending direction of the central line X of the liquid injection passage 1211 is smaller, so as to reduce the space occupation of the check valve element 122 and facilitate to increase the energy density of the battery cell 1.

Fig. 11 shows a schematic view of a valve flap 1221 according to an embodiment of the present application. In some embodiments of the present application, as shown in fig. 11, the valve flaps 1221 are isosceles triangles, each valve flap 1221 includes a first edge 12211 and two second edges 12212 having equal lengths, the first edges 12211 are connected to the valve body 121, and the second edges 12212 of two adjacent valve flaps 1221 abut against each other. It will be appreciated that the two second edges 12212 are circumferentially distributed about a centerline of the check valve spool 122, and that the two second edges 12212 meet the centerline of the check valve spool 122. Note that, in the initial state, the second edges 12212 of two adjacent valve flaps 1221 abut against and are tightly attached to each other, so that the valve flaps 1221 are in sealing fit with each other to block the interior of the liquid injection channel 1211 and the battery cell 1. The structural form of the valve clack 1221 facilitates the close fitting of the valve clacks 1221, and ensures the sealing effect of the one-way valve element 122.

It should be noted that the valve flaps 1221 can be understood as the walls of the chamber 1222, and the valve flaps 1221 are arched according to the structure of the chamber 1222, so that the valve flaps 1221 fit closely to each other in the initial state. In an initial state, the chamber 1222 is communicated with the liquid injection channel 1211, and the valve clack 1221 blocks the liquid injection channel 1211 and the interior of the battery cell 1; when the liquid strikes the valve flap 1221 to cause the valve flap 1221 to open, the liquid injection passage 1211 communicates with the interior of the battery cell 1.

FIG. 12 shows a schematic view of the suction orifice 1213 of the filling valve 12 according to an embodiment of the present application. In some embodiments of the present application, as shown in fig. 12, the valve body 121 is provided with a suction hole 1213, and the suction hole 1213 is used to balance the air pressure inside and outside the battery cell 1. It can be understood that the suction holes 1213 communicate the inside and outside of the battery cell 1 to equalize the air pressures inside and outside the battery cell 1.

The air suction holes 1213 can balance the internal and external pressures of the battery cell 1 at the end of the injection and during the air extraction, ensuring the normal operation of the injection. For example, in the battery air extraction process, the air inside the battery cell 1 is extracted from the air suction holes 1213 by the air extraction device, so that the normal positive and negative pressure circulation of the battery cell 1 in the liquid injection process is ensured. It is to be noted that the discharge from the suction holes 1213 may be a gas, a gas-liquid mixture, or a liquid.

FIG. 13 shows a schematic view of the air suction port 1213 of the priming valve 12 of an embodiment of the present application in communication with the priming channel 1211. In some embodiments of the present application, as shown in fig. 13, the air suction holes 1213 may communicate with the liquid injection channel 1211, i.e., the air suction holes 1213 may communicate the inside and the outside of the battery cell 1 through the liquid injection channel 1211. The air suction holes 1213 are communicated with the liquid injection channel 1211, and the structure is simple and the gas circulation is good.

In some embodiments of the present application, the centerline Y of the gas suction hole 1213 may intersect with the centerline X of the liquid injection channel 1211, the length of the gas suction hole 1213 is short, so that the gas can flow, and the internal gas of the battery cell 1 can enter the liquid injection channel 1211 and be discharged out.

When the centerline Y of the air suction hole 1213 intersects the centerline X of the liquid injection channel 1211, it can be understood that the centerline Y of the air suction hole 1213 is coplanar with the centerline X of the liquid injection channel 1211, and the arrangement of the air suction hole 1213 is as follows.

For example, in some embodiments of the present application, as shown in fig. 13, the centerline Y of the gas suction hole 1213 is perpendicular to the centerline X of the liquid injection channel 1211, and the length of the gas suction hole 1213 is the shortest, so that the internal gas of the battery cell 1 can rapidly enter the liquid injection channel 1211 to be discharged, and the gas flow is facilitated.

For another example, in some embodiments of the present application, an included angle is formed between a centerline Y of the gas suction hole 1213 and a centerline X of the liquid injection channel 1211, which can be understood as an included angle is formed between an extending direction of the gas suction hole 1213 and an extending direction of the liquid injection channel 1211, for example, taking the case that the liquid injection channel 1211 extends vertically, fig. 14 shows a schematic diagram of the gas suction hole 1213 and the liquid injection channel 1211 of an embodiment of the present application, as shown in fig. 14, the gas suction hole 1213 may extend obliquely upward toward the centerline X of the liquid injection channel 1211 from a direction away from the centerline X of the liquid injection channel 1211, as shown in fig. 15, for example, the gas suction hole 1213 and the liquid injection channel 1211 of another embodiment of the present application are schematically illustrated, as shown in fig. 15, the gas suction hole 1213 may also extend obliquely downward toward the centerline X of the liquid injection channel 1211 from a direction away from the centerline X of the liquid injection channel 1211, where "up" refers to a, "lower" means the side of the injection valve 12 near the electrode assembly 14.

Fig. 16 shows a cross-sectional view in the direction C-C of fig. 12. In some embodiments of the present application, as shown in fig. 16, the centerline Y of the gas suction hole 1213 may also not intersect the centerline X of the liquid injection channel 1211, and it is understood that, in a plane perpendicular to the centerline X of the liquid injection channel 1211, the projection of the gas suction hole 1213 does not extend in the same direction as the projection of the centerline X of the liquid injection channel 1211, i.e. the centerline Y of the gas suction hole 1213 is not coplanar with the centerline X of the liquid injection channel 1211. In this case, the length of the gas suction holes 1213 is long, and the gas-liquid mixture discharged from the gas suction holes 1213 can flow on the inner wall of the liquid injection passage 1211 to facilitate the separation and discharge of the gas in the gas-liquid mixture, and the liquid in the gas-liquid mixture adheres to the inner wall of the liquid injection passage 1211.

FIG. 17 is a schematic view showing the non-communication between the suction hole 1213 of the priming valve 12 and the priming channel 1211, according to one embodiment of the present application. In some embodiments of the present application, the air suction holes 1213 may not be in communication with the liquid injection channel 1211, i.e., the air suction holes 1213 directly communicate with the inside and the outside of the battery cell 1.

FIG. 18 shows a schematic view of the structure of the suction holes 1213 of an embodiment of the present application. In some embodiments of the present application, as shown in fig. 18, the suction holes 1213 have a first end 12131 for communicating with the interior of the battery cell 1 and a second end 12132 for communicating with the exterior of the battery cell 1, and the flow cross section of the suction holes 1213 gradually decreases from the first end 12131 to the second end 12132. The first end 12131 and the second end 12132 are opposite ends of the extending direction of the suction hole 1213; since the gas has higher fluidity than the electrolyte, the gas is easily discharged from the inside to the outside of the battery cell 1 due to the gradual change of the flow cross section of the air suction holes 1213, and the electrolyte is not easily discharged, and external impurities are not easily introduced into the inside of the battery cell 1 through the air suction holes 1213. It is to be noted that, in a direction in which the first end 12131 points toward the second end 12132, it is understood that the area of the cross section of the suction holes 1213 in a direction perpendicular to the extending direction of the suction holes 1213 gradually decreases. In the embodiment of the present application, the suction holes 1213 are not limited to circular holes, and may be irregular holes.

In some embodiments of the present application, as shown in fig. 18, the air suction holes 1213 are provided in a plurality, the plurality of air suction holes 1213 being circumferentially arrayed about the centerline X of the liquid injection channel 1211. The plurality of air suction holes 1213 increase the communication passage between the inside and the outside of the battery cell 1, and can improve the gas flow efficiency between the inside and the outside of the battery cell 1, thereby facilitating the balance of the gas pressures inside and outside the battery cell 1.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

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, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.