CN217086795U

CN217086795U - Exhaust device and formation equipment

Info

Publication number: CN217086795U
Application number: CN202221287881.6U
Authority: CN
Inventors: 王文轩; 王国宝; 曹娇; 刘东旭; 浦晨凯; 赵欣
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-07-29
Anticipated expiration: 2032-05-27

Abstract

The application discloses exhaust apparatus and formation equipment. The exhaust apparatus is used for covering the liquid injection hole of the battery monomer, and the exhaust apparatus comprises: the accommodating cavity is communicated with the liquid injection hole; and the gas vent is located the one side that deviates from the notes liquid hole that holds the chamber to with hold the chamber intercommunication, the gas vent is used for the interior gas of discharge battery monomer, exhaust apparatus includes: the body is provided with an accommodating cavity and an exhaust port; and the baffle is accommodated in the accommodating cavity, and at least part of the baffle is positioned between the exhaust port and the liquid injection hole so as to block at least part of the electrolyte discharged from the liquid injection hole. Among the technical scheme of this application embodiment, can provide the space of buffering for the electrolyte among the battery monomer, prevent that electrolyte from directly discharging from the gas vent, promote the security that becomes the process and reduce the waste of electrolyte.

Description

Exhaust device and formation equipment

Technical Field

The application relates to the field of batteries, in particular to an exhaust device and formation equipment.

Background

As the market demand for battery endurance is higher and higher, the energy density and efficiency of the battery are correspondingly increased. During the formation production of battery cells, the electrolyte within the cell can generate gases. In order to maintain a vacuum environment during the formation of the battery and avoid the swelling of the battery core, a negative pressure mechanism is usually used to extract harmful gases generated during the formation of the battery core.

At present, the equipment of evacuation usually causes the leakage and the waste of electrolyte, therefore need set up a device and promote the security that becomes the evacuation process and keep the volume of electrolyte among the battery monomer.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides an exhaust apparatus and a formation device, which can reduce the leakage of electrolyte in the formation vacuumizing process and improve the safety of the formation process.

In a first aspect, the present application provides a gas discharge apparatus for covering a liquid injection hole of a battery cell, the gas discharge apparatus including:

the accommodating cavity is communicated with the liquid injection hole; and

the gas vent is located one side that deviates from and annotates the liquid hole that holds the chamber to with hold the chamber intercommunication, the gas vent is used for the gas in the discharge battery monomer.

Among the technical scheme of this application embodiment, it is used for holding liquid and gas to hold the chamber, and provide buffer space and will follow the battery monomer spun electrolyte and gas and separate in holding the chamber, locate the gas vent and hold the chamber one side of annotating the liquid hole from, exhaust apparatus and negative pressure mechanism connection of being convenient for, and the setting of gas vent can provide the space of buffering for the electrolyte in the battery monomer, prevent that electrolyte from directly discharging from the gas vent, promote the security that becomes the process and reduce the waste of electrolyte.

In some embodiments, the exhaust means comprises:

the body is provided with an accommodating cavity and an exhaust port; and

and the baffle is accommodated in the accommodating cavity, and at least part of the baffle is positioned between the exhaust port and the liquid injection hole so as to block at least part of the electrolyte discharged from the liquid injection hole.

The structure is provided with the baffle plate to reduce the flow speed of at least part of electrolyte discharged from the electrolyte injection hole, reduce the amount of the liquid discharged from the exhaust port, further improve the safety in the formation process and reduce the waste of the electrolyte.

In some embodiments, the baffle has a first surface disposed toward the liquid injection hole, and the first surface is recessed to form a drain portion for guiding the electrolyte to flow back to the liquid injection hole. Among the above-mentioned technical scheme, set up the drainage portion, lead electrolyte to annotating near the liquid hole, promote the speed of electrolyte backward flow.

In some embodiments, the exhaust device further comprises an exhaust pipe accommodated in the accommodating cavity, a first end of the exhaust pipe is communicated with the exhaust port, a gap is formed between a second end of the exhaust pipe and the liquid injection hole, and the baffle plate is arranged in the gap. The structure is provided with the exhaust pipe for guiding the exhaust of gas, so that the exhaust speed of the gas is improved, the gas is condensed and liquefied on the pipe wall to form backflow, and the amount of electrolyte discharged from the exhaust port is reduced.

In some embodiments, the exhaust pipe is provided with an exhaust hole penetrating through the pipe wall of the exhaust pipe, and the exhaust hole is arranged near the second end of the exhaust pipe. Foretell structure sets up the exhaust hole, increases gas outgoing's opening, and the second end setting that will exhaust the hole and be close to the blast pipe shortens the route that gas got into the blast pipe, promotes gas outgoing's efficiency.

In some embodiments, the number of the exhaust holes is multiple, and the exhaust holes are arranged on the pipe wall of the exhaust pipe. Through setting up a plurality of exhaust holes, further promote and hold intracavity gas exhaust's speed.

In some embodiments, the second end of the exhaust pipe is further provided with a liquid collecting plate, the liquid collecting plate is used for collecting the electrolyte, and the liquid collecting plate is provided with a liquid discharging hole for discharging the electrolyte. Among the above-mentioned technical scheme, the collection liquid board is used for collecting the electrolyte that the gas condensation formed, reduces the loss of electrolyte.

In some embodiments, the liquid collecting plate is recessed toward a direction away from the gas outlet to form a liquid collecting portion, and the liquid discharge holes are arranged along the circumferential direction of the liquid collecting portion. Collect the electrolyte that collection liquid portion will condense back, promote the condensation of electrolyte and the speed of backward flow, the circumference of collection liquid portion is located to the outage, can guarantee that liquid can effectively gather in the collection liquid portion, the discharge of the electrolyte in the collection liquid portion of being convenient for simultaneously.

In some embodiments, the side of the baffle facing away from the pour hole is connected to the liquid collection plate. Foretell structure, the installation of collection liquid board of can being convenient for can set up the baffle towards the direction of annotating the liquid hole simultaneously, effectively blocks the liquid of annotating the liquid hole and pouring out.

In some embodiments, a side of the liquid collection plate facing the second end of the gas exhaust pipe is provided with a hydrophobic layer and/or a condensation layer. In the structure, the hydrophobic layer and/or the condensation layer are arranged to improve the condensation speed of the electrolyte.

In some embodiments, the cross-sectional area of the receiving cavity in the direction of gas discharge gradually decreases. Among the foretell technical scheme, through will holding the chamber and establishing to the shape of closing in the mouth, annotate the electrolyte in the liquid hole and can be blockked by the body orientation and carry out the palirrhea near back notes liquid hole once more of holding the lateral wall in chamber, can effectively reduce the loss of electrolyte.

In a second aspect, the present application provides a battery formation apparatus, which includes the exhaust device in the above embodiments, and a negative pressure mechanism, which is communicated with the exhaust device, for providing negative pressure to the battery cells. Through setting up foretell formation equipment, can reduce the leakage that becomes evacuation process electrolyte, promote the security that becomes the process.

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 battery cell provided in some embodiments of the present application;

FIG. 2 is a schematic structural view of an exhaust apparatus provided in some embodiments of the present application;

FIG. 3 is an enlarged schematic view of the circle frame A shown in FIG. 2;

FIG. 4 is a schematic illustration of an exhaust apparatus according to further embodiments of the present application;

fig. 5 is a schematic structural diagram of a formation device according to some embodiments of the present disclosure.

Detailed description of the reference numerals

10. An exhaust device; 101. a body; 102. a baffle plate; 103. an accommodating chamber; 104. an exhaust port; 105. a drainage part; 106. an exhaust pipe; 107. an exhaust hole; 108. a liquid collecting plate; 109. a liquid collecting part; 110. a side wall; 111. a drain hole;

20. a battery cell; 21. an end cap assembly; 22. a housing; 23. a battery cell assembly; 24. an explosion-proof valve; 25. an electrode terminal; 26. a liquid injection hole;

30. a negative pressure mechanism;

100. formation equipment.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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

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

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the production process of the battery, after the components in the battery cell are mounted, a formation process is required to form a solid electrolyte interface film, SEI film for short, on the surface of the electrode. In order to form a complete SEI film, a small current charging of the battery cell is required, and this step is called formation film formation. The formation process can be accompanied by gas generation, the gas can generate negative influence on the formation speed, meanwhile, the gas can reduce the conversion efficiency of the battery monomer if the gas is left in the battery monomer, and because the gas generated in the battery monomer can lead part of the battery pole pieces to be exposed and can not be soaked in electrolyte, the part of the pole pieces can not be subjected to effective electric energy conversion, and the efficiency of the battery monomer is reduced. In order to discharge gas generated during formation of the film in time to improve formation efficiency, the inside of the battery monomer needs to be kept in a high-temperature negative-pressure environment during formation of the battery monomer.

The inventor finds that in an environment with high-temperature negative pressure, electrolyte in a battery cell is partially pumped by a negative pressure mechanism, and electrolyte loss is generated. In addition, the boiling point of the electrolyte changes with the negative pressure, and the electrolyte becomes gaseous during the formation process, and the gas generated by the formation is extracted, thereby further causing the loss of the electrolyte.

In order to solve the problem, the inventor designs an exhaust device covering a liquid injection hole of a battery cell, the exhaust device comprising: an accommodating cavity and an exhaust port. Hold the chamber and annotate liquid hole intercommunication, the gas vent is located and is held one side that deviates from notes liquid hole of chamber to with hold the chamber intercommunication, the gas vent is used for discharging the gas in the battery monomer.

Hold the chamber and be used for holding liquid and gas to provide the buffer space and will separate from spun electrolyte and gas in holding the chamber in the battery monomer, locate the gas vent and hold the chamber one side of annotating the liquid hole away from, exhaust apparatus and negative pressure mechanism of being convenient for are connected, and the setting of gas vent can provide the space of buffering for the electrolyte in the battery monomer, prevent that electrolyte from directly discharging from the gas vent, promote the security that becomes the process and reduce the waste of electrolyte.

The battery that this application embodiment provided, its produced power consumption device as the power, the power consumption device can be but not limited to cell-phone, flat board, notebook computer, electronic toy, electric tool, storage battery car, electric automobile, steamer, spacecraft etc.. 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.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a battery cell according to some embodiments of the present disclosure; FIG. 2 is a schematic structural view of an exhaust apparatus provided in some embodiments of the present application; FIG. 3 is an enlarged schematic view of the circle frame A shown in FIG. 2; FIG. 4 is a schematic view of an exhaust apparatus according to other embodiments of the present application.

As shown in fig. 1 and 2, the gas discharge device 10 according to the embodiment of the present invention is used to cover the liquid inlet 26 of the battery cell 20. The exhaust apparatus 10 includes: a receiving chamber 103 and an exhaust port 104. The accommodating cavity 103 is communicated with the liquid injection hole 26, the exhaust port 104 is arranged on one side of the accommodating cavity 103, which is far away from the liquid injection hole 26, and is communicated with the accommodating cavity 103, and the exhaust port 104 is used for exhausting gas in the battery cell 20. The accommodating chamber 103 is a through cavity formed in the exhaust device 10, and the accommodating chamber 103 can accommodate a certain amount of gas and liquid. The gas outlet 104 is a through hole or an opening, and the gas outlet 104 communicates with the accommodating chamber 103, and can discharge gas or liquid in the accommodating chamber 103.

In the present application, the exhaust device 10 may be connected to the liquid inlet 26 for gas exhaust, or may be connected to another through hole in the battery cell 20 as long as gas exhaust is possible. Furthermore, the exhaust device 10 can be hermetically connected to the battery cell 20 to prevent the gas or the electrolyte in the battery cell 20 from leaking, thereby ensuring the safety of the formation process and the efficiency of exhaust.

The battery cell 20 in the embodiment of the present application refers to the smallest unit constituting the battery. As shown in fig. 1, 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. Also, the vent assembly 10 can form a stable sealing connection with the battery cell 20 through the end cap assembly 21.

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, and an exemplary pressure relief mechanism may be an explosion-proof valve 24. 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, the end cap assembly 21 further has a liquid injection hole 26, and the liquid injection hole 26 is communicated with the inside of the battery cell 20 and used for guiding the electrolyte to the inside of the battery cell 20 and infiltrating the electrolyte assembly 23.

The cell assembly 23 is a component in the battery cell 20 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.

In the technical scheme of this application embodiment, exhaust apparatus 10 covers liquid injection hole 26 of battery monomer 20, and with annotate liquid hole 26 intercommunication, it is used for holding liquid and gas of annotating discharge in liquid hole 26 to hold chamber 103, and provide buffer space and will follow battery monomer 20 spun electrolyte and gas and separate in holding chamber 103, locate one side that holds chamber 103 and deviate from annotating liquid hole 26 with gas vent 104, exhaust apparatus 10 and negative pressure mechanism connection can be convenient for, and the setting of gas vent 104 can provide the space of buffering for the electrolyte in the battery monomer 20, prevent that electrolyte from directly discharging from gas vent 104, promote the security that becomes the process and reduce the waste of electrolyte.

In some embodiments of the present application, referring to fig. 2, the exhaust apparatus 10 includes: a body 101 and a baffle 102. The body 101 is provided with a housing chamber 103 and an exhaust port 104. The baffle plate 102 is accommodated in the accommodating chamber 103, and at least a part of the baffle plate 102 is positioned between the exhaust port 104 and the pour hole 26 to block at least a part of the electrolyte discharged from the pour hole 26.

The baffle 102 may be directly connected to the body 101 or may be connected to the body 101 through another member. The position of the baffle plate 102 in the accommodating cavity 103 should be fixed to avoid displacement at the moment of electrolyte rushing out, so as to ensure effective blocking of the electrolyte sprayed out from the electrolyte injection hole 26. The baffle 102 may be made of a hydrophobic material or a cold metal material to reduce the amount of electrolyte attached to the baffle 102 and increase the electrolyte return rate.

The body 101 may be made of a rubber material to facilitate the sealing connection of the body 101 and the battery cell 20. Alternatively, the body 101 may be made of other materials, or two materials may be used to form different parts, for example, the part of the body 101 connected to the injection hole 26 is made of rubber, and other parts may be made of metal or organic materials to improve the strength and life of the exhaust device 10. The specific material may be set according to the use condition, and is not limited herein.

In some embodiments, the orthographic projection of the baffle 102 on the end cap assembly 21 at least partially completely covers the pour hole 26. The projection of the baffle plate 102 covers the liquid inlet 26, and can effectively block the liquid discharged from the liquid inlet 26 and promote the backflow of the electrolyte.

With the above structure, the baffle plate 102 can prevent the sucked electrolyte from being directly discharged through the exhaust port 104, so as to reduce the flow rate of at least part of the electrolyte discharged from the injection hole 26, reduce the amount of the electrolyte discharged from the exhaust port 104, further improve the safety in the formation process and reduce the waste of the electrolyte.

In some embodiments of the present application, the body 101 may be made of rubber with thermal insulation added. The material has a certain heat insulation effect, so that the temperature difference between the inside and the outside of the body 101 is ensured, the condensation and backflow speed of vaporized electrolyte is increased, and the electrolyte loss is reduced.

In some embodiments of the present application, as shown in FIG. 2, the baffle 102 has a first surface disposed toward the pour hole 26, the first surface being recessed to form a drain 105, the drain 105 being used to direct electrolyte to flow back into the pour hole 26. The shape of the drainage portion 105 may be a circular shape, an oval shape or a racetrack shape recessed along the surface of the baffle plate 102 so as to store part of the condensed and refluxed electrolyte. In order to increase the condensation speed of the electrolyte on the surface, a condensation layer can be arranged on the surface of the baffle plate 102. Meanwhile, in order to accelerate the flow rate of the electrolyte condensed on the surface of the baffle plate 102, a hydrophobic layer may be provided on the surface of the baffle plate 102.

This application embodiment is through setting up drainage portion 105, carries out the condensation with electrolyte on baffle 102, and the while leads to near annotating liquid hole 26, promotes the speed of electrolyte backward flow, has reduced the loss of electrolyte.

In some embodiments of the present application, as shown in fig. 2 to 4, the exhaust device 10 further includes an exhaust pipe 106, and the exhaust pipe 106 is accommodated in the accommodating chamber 103. The exhaust pipe 106 may be a circular straight pipe for exhausting the gas in the accommodating chamber 103. The exhaust pipe 106 has a first end and a second end opposite to each other and communicating with each other. The first end of the exhaust pipe 106 communicates with the exhaust port 104, a gap is formed between the second end of the exhaust pipe 106 and the pour hole 26, and the baffle plate 102 is disposed in the gap, i.e., a distance is formed between the second end of the exhaust pipe 106 and the pour hole 26, so that the gas in the pour hole 26 can flow into the accommodating chamber 103 through the gap. It can be ensured that the gas and liquid in the accommodating chamber 103 are not directly discharged through the gas discharge pipe 106.

In the above configuration, the exhaust pipe 106 is provided to guide the exhaust of the gas, thereby increasing the speed of the gas exhaust and reducing the amount of the electrolyte discharged from the exhaust port 104. Moreover, by providing the gap, the liquid can be prevented from being directly discharged from the gas discharge pipe 106 while accommodating the electrolyte flowing backward and the electrolyte discharged from the liquid inlet 26 in the gap, and the volume of the electrolyte in the accommodation chamber 103 can be effectively maintained.

In some embodiments of the present application, referring to fig. 3, the exhaust pipe 106 is provided with an exhaust hole 107 penetrating through a pipe wall of the exhaust pipe 106, and the exhaust hole 107 is disposed near the second end of the exhaust pipe 106. The exhaust holes 107 may be circular through holes, and the exhaust holes 107 may penetrate along the thickness direction of the pipe wall to improve the efficiency of production and manufacture, and simultaneously shorten the path of the gas passing through the exhaust holes 107 to facilitate the gas exhaust. The exhaust pipe 106 is provided with an exhaust hole 107 to increase the opening area for gas exhaust and improve the efficiency of gas exhaust.

In some embodiments of the present application, the number of the exhaust holes 107 is multiple, and the exhaust holes 107 are uniformly distributed on the pipe wall of the exhaust pipe 106. The plurality of exhaust holes 107 are uniformly distributed, and may be uniformly distributed at equal intervals along the circumferential direction or the axial direction of the pipe wall of the exhaust pipe 106. The speed of gas exhaust in the accommodating chamber 103 is further increased by providing a plurality of exhaust holes 107.

In some embodiments of the present application, please refer to fig. 4, the second end of the exhaust pipe 106 is further provided with a liquid collecting plate 108, the liquid collecting plate 108 is used for collecting the electrolyte, and the liquid collecting plate 108 is provided with a liquid discharging hole 111 for discharging the electrolyte. A liquid collection plate 108 may be provided towards the end of the exhaust pipe 106 to collect liquid condensed on the walls of the exhaust pipe 106.

The electrolyte is partially vaporized into a gas and condensed into electrolyte after entering the exhaust pipe 106, and this electrolyte can increase the flow rate if it can be concentrated. Therefore, this application embodiment is through setting up collection liquid board 108 for collect the electrolyte that the gas condensation formed, it is many to converge less, increases the mobility of liquid and collects through collection liquid board 108, and through setting up the electrolyte backward flow of outage 111 with the condensation to holding in the chamber 103, can reduce the loss of electrolyte.

In some embodiments of the present application, as shown in fig. 4, the liquid collection plate 108 is recessed toward a direction away from the gas discharge opening 104 to form a liquid collection portion 109, and the liquid discharge holes 111 are provided along a circumferential direction of the liquid collection portion 109.

The liquid collecting unit 109 guides the electrolyte condensed on the liquid collecting plate 108, and the electrolyte flows to the liquid collecting unit 109, so that the condensing and refluxing speeds of the electrolyte can be increased. Alternatively, the liquid collecting part 109 may be provided at the center of the liquid collecting plate 108 to collect condensed electrolyte throughout the liquid collecting plate 108 as much as possible.

In some embodiments of the present application, the side of the baffle 102 facing away from the pour hole 26 is attached to a liquid collection plate 108. Attaching the baffle 102 to the drip plate 108 improves the stability of the baffle 102 and the ease of installation. Furthermore, the baffle plate 102 and the liquid collecting plate 108 are integrally formed, so that the production and installation efficiency of the baffle plate 102 and the liquid collecting plate 108 can be further improved.

In some embodiments, the opposite ends of the baffle 102 and the drip plate 108 may extend in the first direction to connect with the body 101, further improving the stability of the installation of the baffle 102 and the drip plate 108. The first direction may be a direction perpendicular to the axial direction of the exhaust pipe 106.

In some embodiments of the present application, the side of the liquid collection plate 108 facing the second end of the gas exhaust pipe 106 is provided with a hydrophobic layer and/or a condensation layer. The hydrophobic layer in the embodiment of the application can be a dense molecular film layer formed by a high molecular material on the surface of the liquid collecting plate 108, so that gas or liquid molecules are prevented from attaching to or penetrating through the gap on the surface of the liquid collecting plate 108, and the flowing speed of liquid is improved. For example, the hydrophobic layer may be made of a fluorine-containing organic material or a carbosilane-containing organic material. The condensation layer may be formed by a chemical vapor deposition process using a condensation material, and may be made using a material such as tungsten hexafluoride. The condensation layer can rapidly absorb the heat of the gas, reduce the temperature of the gas and improve the condensation speed of the gas.

By arranging the hydrophobic layer, the amount of electrolyte attached to the liquid collecting plate 108 can be reduced, and the flowing speed of the electrolyte is improved. The condensation layer is arranged, so that the condensation speed of the vaporized electrolyte can be increased. The structure effectively increases the backflow speed of the electrolyte and the condensation amount.

In some embodiments of the present application, as shown in fig. 2 and 4, the cross-sectional area of the receiving chamber 103 in the direction of gas discharge gradually decreases.

Specifically, the accommodating chamber 103 has a truncated cone shape with an axial direction along the liquid outlet direction of the liquid inlet 26. In some embodiments, the receiving cavity 103 may also be tapered or stepped.

The above configuration can facilitate the formation of the storage chamber 103, and can reduce the loss of the electrolyte by forming the storage chamber 103 into a truncated cone shape, so that the electrolyte in the injection hole 26 can be stopped by the main body 101 toward the side wall 110 of the storage chamber 103 and can flow back to the vicinity of the injection hole 26 again.

Specifically, referring to fig. 1 to 4, the embodiment of the present application provides a gas exhaust device 10 for covering a liquid injection hole 26 of a battery cell 20. The exhaust apparatus 10 includes: a receiving chamber 103 and an exhaust port 104. The accommodating cavity 103 is communicated with the liquid injection hole 26, the exhaust port 104 is arranged on one side of the accommodating cavity 103, which is far away from the liquid injection hole 26, and is communicated with the accommodating cavity 103, and the exhaust port 104 is used for exhausting gas in the battery cell 20.

Specifically, the exhaust apparatus 10 includes: a body 101 and a baffle 102. The body 101 is provided with a housing chamber 103 and an exhaust port 104. The baffle plate 102 is accommodated in the accommodating chamber 103, and at least a part of the baffle plate 102 is positioned between the exhaust port 104 and the pour hole 26 to block at least a part of the electrolyte discharged from the pour hole 26.

The baffle plate 102 completely covers the pour hole 26 in an orthographic projection on the end cap assembly 21, the baffle plate 102 is recessed toward the surface of the pour hole 26 to form a drain portion 105, and the drain portion 105 is used for guiding the electrolyte to flow back to the pour hole 26. The exhaust device 10 further includes an exhaust pipe 106, and the exhaust pipe 106 is accommodated in the accommodation chamber 103. The exhaust pipe 106 is provided with an exhaust hole 107 penetrating through the pipe wall of the exhaust pipe 106, and the exhaust hole 107 is arranged near the second end of the exhaust pipe 106. The number of the exhaust holes 107 is plural, and the plural exhaust holes 107 are uniformly arranged on the pipe wall of the exhaust pipe 106.

Further, the second end of the exhaust pipe 106 is further provided with a liquid collecting plate 108, the liquid collecting plate 108 is used for collecting electrolyte, and the liquid collecting plate 108 is provided with a liquid discharging hole 111 for discharging the electrolyte. The edge of the liquid collecting plate 108 is recessed in a direction away from the air outlet 104 to form a liquid collecting portion 109, and a liquid discharge hole 111 is provided along the circumferential direction of the liquid collecting portion 109. The side of the baffle 102 facing away from the pour hole 26 is connected to a liquid collection plate 108. The side of the liquid collection plate 108 facing the second end of the gas exhaust pipe 106 is provided with a hydrophobic layer and/or a condensation layer.

The cross-sectional area of the accommodating chamber 103 in the gas discharge direction gradually decreases, and the accommodating chamber 103 has a truncated cone-shaped structure in which the axial direction is along the liquid outlet direction of the liquid injection hole 26.

The present application further provides a battery formation apparatus 100, as shown in fig. 5, which includes the air exhaust device 10 and the negative pressure mechanism 30 in any of the above embodiments, wherein the negative pressure mechanism 30 is communicated with the air exhaust device 10 for providing negative pressure to the battery cell 20. By arranging the formation equipment 100, the leakage of electrolyte in the formation vacuumizing process can be reduced, and the safety of the formation process is improved.

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 gas exhaust apparatus for covering a liquid injection hole of a battery cell, comprising:

the accommodating cavity is communicated with the liquid injection hole; and

the air outlet is arranged on one side of the accommodating cavity, which is far away from the liquid injection hole, and is communicated with the accommodating cavity, the air outlet is used for discharging gas in the battery monomer,

the exhaust apparatus includes:

the body is provided with the accommodating cavity and the exhaust port; and

2. The exhaust apparatus according to claim 1, wherein the baffle plate has a first surface disposed toward the pour hole, the first surface being recessed to form a drain portion for guiding the electrolyte to flow back to the pour hole.

3. The exhaust apparatus according to claim 1 or 2, further comprising an exhaust pipe accommodated in the accommodating chamber, a first end of the exhaust pipe communicating with the exhaust port, a gap being formed between a second end of the exhaust pipe and the liquid injection hole, the baffle being disposed in the gap.

4. The exhaust apparatus as claimed in claim 3, wherein the exhaust pipe has an exhaust hole formed therethrough, the exhaust hole being disposed adjacent to the second end of the exhaust pipe.

5. The exhaust device according to claim 4, wherein the exhaust hole is provided in plurality, and the plurality of exhaust holes are arranged in a pipe wall of the exhaust pipe.

6. The exhaust device as claimed in claim 3, wherein the second end of the exhaust pipe is further provided with a liquid collecting plate for collecting the electrolyte, and the liquid collecting plate is provided with a liquid discharging hole for discharging the electrolyte.

7. The exhaust apparatus as claimed in claim 6, wherein the liquid collecting plate is recessed in a direction away from the exhaust port to form a liquid collecting portion, and the liquid discharge holes are provided along a circumferential direction of the liquid collecting portion.

8. The vent apparatus as claimed in claim 6, wherein a side of the baffle plate facing away from the liquid injection hole is connected to the liquid collection plate.

9. A gas exhaust device according to any one of claims 6 to 8, wherein the side of the liquid collection plate facing the second end of the gas exhaust pipe is provided with a hydrophobic layer and/or a condensation layer.

10. The exhaust apparatus according to any one of claims 1 to 2 and 4 to 8, wherein a cross-sectional area of the housing chamber in a direction in which the gas is discharged is gradually reduced.

11. A battery formation apparatus, comprising:

an exhaust apparatus according to any one of claims 1 to 10; and

and the negative pressure mechanism is communicated with the exhaust device and is used for providing negative pressure for the battery monomer.