CN116779898A

CN116779898A - Single cell, single cell forming process and battery module

Info

Publication number: CN116779898A
Application number: CN202310933118.9A
Authority: CN
Inventors: 刘红梅; 张建权; 杨磊; 樊敏; 陈金锐
Original assignee: Deep Blue Automotive Technology Co ltd
Current assignee: Deep Blue Automotive Technology Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2023-09-19

Abstract

The application belongs to the technical field of batteries, and relates to a single cell, a single cell forming process and a battery module, wherein the single cell comprises a first polar plate, a membrane electrode and a second polar plate which are sequentially stacked; a plurality of groups of runner inlets and outlets are correspondingly arranged on the frame of the membrane electrode, the first polar plate and the second polar plate; a first sealing groove is arranged between the first polar plate and the membrane electrode, a second sealing groove is arranged between the second polar plate and the membrane electrode, the extending track of the first sealing groove and the extending track of the second sealing groove bypass the runner inlet and outlet, the first polar plate is provided with a first glue injection hole and a first vent hole on the extending track of the first sealing groove, and the second polar plate is provided with a second glue injection hole and a second vent hole on the extending track of the second sealing groove. According to the application, the glue inlet paths respectively positioned on the first polar plate and the second polar plate are arranged in the single cells, so that the uniformity and the synchronism of the single cells in the integral glue injection sealing connection process can be effectively improved, the formation of air pockets can be prevented, and the glue injection sealing connection effect can be improved.

Description

Single cell, single cell forming process and battery module

Technical Field

The application relates to the technical field of batteries, in particular to a single battery, a single battery forming process and a battery module.

Background

The fuel cell is a power generation device for directly converting chemical energy in fuel and oxidant into electric energy through electrochemical reaction, the hydrogen fuel cell comprises anode plates, cathode plates, membrane electrodes and other parts, and provides specific areas for hydrogen, oxygen and coolant through sealing elements to perform electrochemical reaction to realize a power generation function, and the fuel cell for vehicles generally needs hundreds of cells to be connected in series to provide enough voltage and power, so that the fuel cell stack is formed by alternately stacking and pressing bipolar plate assemblies and membrane electrode assemblies, and in the alternate stacking process, each of the bipolar plate assemblies and the bipolar plate assemblies is divided into independent areas for being used as channels for flowing different gases or liquids, and in order to prevent the gas or liquid from channeling between the channels, structures for sealing must be arranged between the bipolar plate assemblies and the membrane electrodes.

In the existing single cell structure, the sealing structures arranged between the electrode plates and the membrane electrode can be independent sealing rings, the sealing rings are positioned by the pressing force generated when the electrode plates and the membrane electrode are pressed, and the sealing rings are fixed by arranging grooves or positioning structures on the mounting frames of the electrode plates or the membrane electrode, so that the sealing mode is easy to cause poor sealing due to limited dimensional control precision and mounting precision of the sealing rings, for example, the sealing structure of the fuel cell disclosed in Chinese patent publication No. CN216084951U comprises a bipolar plate, a membrane electrode assembly and sealing rings arranged between the bipolar plate and the membrane electrode assembly, a plurality of slots are arranged in the sealing grooves of the bipolar plate and/or on the frame of the membrane electrode assembly, glue is injected in the slots, so that the sealing rings are integrally connected with the sealing grooves of the bipolar plate and/or the upper side, the lower side or the two sides of the frame of the membrane electrode assembly, and the sealing rings in the structure are substantially independent components, and the offset of the sealing rings can be reduced to a certain extent only by injecting glue and the sealing rings are connected, but the sealing performance is limited.

Along with the progress of the technological process, the single cell structure directly opposite to the glue injection between the polar plates and the membrane electrode is started to form a sealing structure, and the sealing structure has the advantages that the sealing structure can be used as a connecting structure of the polar plates and the polar plates or the polar plates and the membrane electrode at the same time after being formed by glue injection, so that the manufacturing process of press-fitting connection in the traditional structure is simplified, compared with the traditional press-fitting sealing ring, for example, the sealing structure of a non-welded metal plate single cell is disclosed in Chinese patent with the publication number of CN214176078U, and comprises a single cell formed by stacking an anode plate, a membrane electrode and a cathode plate together, an air main channel is communicated with a cathode flow field through an air side air duct and penetrates through an air side boss of the cathode plate, and a hydrogen main channel is communicated with the anode flow field through a hydrogen side air duct and penetrates through a hydrogen side boss of the anode plate; the positive plate blank boss is communicated with the positive plate blank boss through a first channel, a first communication hole is formed in a membrane electrode frame between the positive plate blank boss and the negative plate blank boss, the negative plate blank boss is communicated with the negative plate hydrogen side boss through a second channel, a sealing ring is formed in the positive plate blank boss, the first channel, the positive plate blank boss, the negative plate blank boss, the second channel and the negative plate hydrogen side boss through integral glue injection, the sealing ring is formed through integral glue injection in the structure, the sealing effect of a single cell can be improved, but the influence of a glue injection process on the performance of the single cell is not specifically considered, so that the structure still has the defects, on one hand, the membrane electrode is usually made of soft materials, the membrane electrode is positioned between two polar plates, if pressure of glue injected from two sides is unbalanced, the membrane electrode is easy to deform, the pressure condition of two sides of the membrane electrode is not considered in the existing glue injection mode, on the other hand, the design of an exhaust path is not considered, air pockets are easy to be formed in the glue injection, and the sealing connection effect after glue injection is influenced.

In summary, in the conventional cell structure, at least the following drawbacks exist: when the existing single cells are in sealing connection in an integrated glue injection mode, each layer cannot be filled uniformly at the same time in the glue injection process, so that the pressure levels on two sides of the membrane electrode are inconsistent, deformation is easy to generate, and meanwhile, air pockets are easy to be formed by residual air during glue injection, so that the sealing connection effect after glue injection is affected.

Disclosure of Invention

The application aims to provide a membrane electrode and a single cell, which are used for solving the problems that when the existing single cell is in sealing connection in an integrated glue injection mode, each layer cannot be filled uniformly at the same time in the glue injection process, so that the pressure levels on two sides of the membrane electrode are inconsistent, deformation is easy to occur, and meanwhile, air pockets are easy to be formed by residual air during glue injection, so that the sealing connection effect after glue injection is affected.

To achieve the above and related objects, in a first aspect, the present application provides a single cell comprising:

the membrane electrode comprises a frame and a membrane component, wherein a reaction area is arranged in the middle of the frame, the membrane component is arranged in the reaction area, and a runner inlet and a runner outlet are arranged on the frame;

the electrode plate assembly comprises a first electrode plate and a second electrode plate, and the first electrode plate, the membrane electrode and the second electrode plate are sequentially stacked;

a plurality of groups of runner inlets and outlets are correspondingly arranged on the frame, the first polar plate and the second polar plate;

a first sealing groove is formed between the first polar plate and the membrane electrode, a second sealing groove is formed between the second polar plate and the membrane electrode, the extending track of the first sealing groove and the extending track of the second sealing groove bypass one or more runner inlets and outlets, the first polar plate is provided with a first glue injection hole and a first vent hole on the extending track of the first sealing groove, and the second polar plate is provided with a second glue injection hole and a second vent hole on the extending track of the second sealing groove;

the single cell is injected with glue from the same point positions of two sides towards the membrane electrode through the first glue injection hole and the second glue injection hole, a first sealing ring is formed in the first sealing groove, and a second sealing ring is formed in the second sealing groove.

Further, the first glue injection hole and the second glue injection hole are arranged at corresponding positions.

Further, the first glue injection holes are formed in the first polar plate, and the second glue injection holes are formed in the second polar plate, so that glue injection efficiency is improved.

Further, the first glue injection hole and the second glue injection hole are identical in number and aperture, the consistency of the flow speed of liquid glue materials in the first sealing groove and the second sealing groove is guaranteed in the glue injection process, untimely air exhaust caused by overlarge difference between the time length of the glue body filled in the first sealing groove and the time length of the glue body filled in the second sealing groove is avoided, meanwhile, consistency of glue injection pressure in the first sealing groove and the second sealing groove is guaranteed, and compression deformation of a membrane electrode in the glue injection process is avoided. .

Further, at least one first exhaust hole is formed between two adjacent first glue injection holes, so that the exhaust effect is improved, and air pockets are prevented from being formed in time due to the fact that air between two glue injection positions is not discharged in the process of simultaneously injecting glue at the two glue injection positions.

Further, along the extending direction of first seal groove, first exhaust hole is rather than adjacent two the interval is equal between the first injecting glue hole, is favorable to further improving the exhaust effect, ensures that the gas between two first injecting glue holes can be discharged when this section first seal groove fills liquid sizing material simultaneously, prevents to be in the in-process of two injecting glue positions simultaneously injecting glue, and the gas discharge between two injecting glue positions is untimely to form the air pocket.

Further, at least one second exhaust hole is formed between two adjacent second glue injection holes, so that the exhaust effect is improved, and air pockets are prevented from being formed in time due to the fact that air between two glue injection positions is not discharged in the process of simultaneously injecting glue at the two glue injection positions.

Further, along the extending direction of second seal groove, the second exhaust hole is rather than adjacent two the interval between the second injecting glue hole equals, is favorable to further improving the exhaust effect, ensures that the gas between two second injecting glue holes can be discharged when this section first seal groove fills up liquid sizing material simultaneously, prevents to be in the in-process of two injecting glue positions simultaneously injecting glue, and the gas discharge between two injecting glue positions is untimely to form the air pocket.

Further, the setting position of the first exhaust hole corresponds to the setting position of the second exhaust hole.

Further, the extending track of the first sealing groove and the extending track of the second sealing groove on the membrane electrode are at least partially overlapped, and the membrane electrode is provided with a channel hole at the overlapping position of the extending track of the first sealing groove and the extending track of the second sealing groove, and the channel hole is used for connecting the first sealing ring formed by glue injection and the second sealing ring into a whole, and the first sealing ring and the second sealing ring form a paste structure, so that the integral sealing connection quality is improved, and the phenomenon that the first sealing ring and the second sealing ring move to influence the sealing effect is avoided.

Further, the position of the channel hole, which is located on the first sealing groove, corresponds to the first glue injection hole, and the position of the channel hole, which is located on the second sealing groove, corresponds to the second glue injection hole, so that extrusion to the membrane electrode during glue injection from two sides is reduced, and deformation of the membrane electrode during compression in the glue injection process is avoided.

Further, the number of the channel holes formed in each setting area is two or more, so that the connection strength between the first sealing groove and the second sealing groove is improved, the integral sealing connection quality is further improved, and the first sealing ring and the second sealing ring are prevented from moving better.

Further, be provided with on the first polar plate towards the first arch of membrane electrode, first arch is located in the first seal groove, the injecting glue mould includes movable mould and cover half, be provided with on the second polar plate towards the second arch of membrane electrode, the second arch is located in the second seal groove is favorable to guaranteeing the injecting glue and solidifies the stability of back seal structure, prevents that seal structure from moving and influences sealed effect.

Further, the first protrusions and the second protrusions are oppositely arranged and are abutted to the membrane electrode, so that clamping can be formed on the membrane electrode, the overall structural strength of the single cell is improved, and deformation of the membrane electrode in the glue injection process is further prevented.

In a second aspect, the present application further provides a process for forming a single cell, in which the single cell is integrally formed by injection molding using an injection mold, the fixed mold is provided with a first injection channel, the movable mold is provided with a second injection channel, and the process for forming the single cell includes:

stacking the first polar plate, the membrane electrode and the second polar plate into a cavity of the fixed die, and enabling the first glue injection channel to be aligned with the first glue injection hole;

covering the movable die on one side of a cavity of the fixed die to compress the first polar plate, the membrane electrode and the second polar plate which are stacked, and enabling the second glue injection channel to be aligned with the first glue injection hole;

the first glue injection hole and the second glue injection hole are injected through the first glue injection channel of the fixed die and the second glue injection channel of the movable die at the same time, so that liquid glue material is synchronously filled into the first sealing groove and the second sealing groove towards the same point of a membrane electrode, and gas in the first sealing groove and the second sealing groove is discharged through the electrode exhaust hole and the polar plate exhaust hole;

and curing after glue injection, so that the liquid glue filled in the first sealing groove and the second sealing groove is cured to form an integrated sealing structure connected with each other.

Further, a third sealing groove is arranged between the outer side face of the first polar plate and the fixed die or between the outer side face of the second polar plate and the movable die, the third sealing groove is connected with a glue injection channel on a die on one side where the third sealing groove is located, and liquid glue is filled into the third sealing groove to form a third sealing ring during glue injection, so that the third sealing ring is directly connected with the first sealing ring or the second sealing ring into a whole.

In a third aspect, the present application also provides a battery module comprising a housing, and a plurality of cells as described above stacked within the housing.

In summary, the membrane electrode and the single cell provided by the application have at least the following technical effects: through setting up the advance gluey route that is located first polar plate and second polar plate and position corresponds respectively in the monocell, make the monocell can carry out the injecting glue in both sides in step and evenly, be provided with the exhaust route on first polar plate and the second polar plate respectively simultaneously, avoid the air pocket to appear in the air residue, can effectively improve monocell in the homogeneity and the synchronism of an organic whole injecting glue sealing connection in-process, effectively improved membrane electrode both sides pressurized horizontal uniformity, air residue when having avoided the injecting glue simultaneously to a great extent prevents to form the air pocket, be favorable to improving the sealing connection effect after the injecting glue.

Drawings

Fig. 1 is a schematic cross-sectional view of a single cell after glue injection, according to an exemplary embodiment of the present application;

fig. 2 is a schematic partial cross-sectional view of a single cell shown in an exemplary embodiment of the present application prior to injection;

fig. 3 is a schematic diagram showing an assembly relationship of a single cell after glue injection according to an exemplary embodiment of the present application;

fig. 4 is a schematic structural view of a membrane electrode according to an exemplary embodiment of the present application;

fig. 5 is a schematic structural view of a first plate according to an exemplary embodiment of the present application;

fig. 6 is a schematic structural view of a second plate according to an exemplary embodiment of the present application;

fig. 7 is a schematic partial cross-sectional view of a single cell before glue injection, according to another exemplary embodiment of the present application;

fig. 8 shows an application scenario of integral cell glue injection using a cell molding process;

fig. 9 shows another application scenario in which a cell molding process is applied to integrally molding a cell.

Wherein:

1-a membrane electrode; 10-a first seal groove; 100-inlet and outlet of a runner; 101-frame; 1011-reaction zone; 102-a membrane module; 11-a channel hole; 2-a first polar plate; 20-a second seal groove; 21-a first glue injection hole; 22-a first vent; 3-a second polar plate; 31-a second glue injection hole; 32-a second vent; 4-a first sealing ring; 5-a second sealing ring; 6-a third sealing ring; 71-fixed die; 71-a first glue injection channel; 72-moving die; 721-a second glue injection channel; 722-third seal groove.

Detailed Description

Further advantages and effects of the present application will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

In one embodiment, referring to fig. 1-6, the present application exemplarily shows a structural scheme of a single cell including a membrane electrode 1 and a plate assembly, wherein:

the membrane electrode 1 comprises a frame 101 and a membrane module 102, a reaction area 1011 is arranged in the middle of the frame 101, the membrane module 102 is arranged in the reaction area 1011, the frame 101 is a frame structure for fixing the membrane module 102, the frame 101 is also used for being connected and matched with a polar plate to form flow channels and reaction areas 1011 of different liquids in electrochemical reaction, the membrane module 102 refers to a carrier for electrochemical reaction in the membrane electrode 1, in terms of constitution, for example, a three-in-one module formed by hot pressing a proton exchange membrane, a catalytic layer electrode and a diffusion layer after being immersed with perfluorosulfonic acid membrane liquid at a certain temperature and pressure, and a polar plate arranged at two sides of the membrane electrode 1 form a fuel cell reaction electric pile together, and it is to be understood that in the present embodiment, the division of the structural parts of the membrane electrode 1 is used for facilitating understanding scheme implementation, in some conventional descriptions in the field, the membrane module 102 described in the present embodiment is broadly referred to as the membrane electrode 1 based on the main functions of the membrane electrode 1, so that in the present embodiment, in understanding the structure of the membrane electrode 1 in terms of specific scenario, the frame structure can also be used as a standard for understanding the actual functions of the frame and the membrane module 101 and the generalized function as the generalized description of the structural differences, namely, and the structural parts of the membrane module 101 are not to be used as the generalized standard for understanding of the actual functions.

The electrode plate assembly comprises a first electrode plate 2 and a second electrode plate 3, wherein the first electrode plate 2, the membrane electrode 1 and the second electrode plate 3 are sequentially stacked, and it is worth noting that in the existing single cell structure, a bipolar plate structure is generally adopted, namely, a cathode for obtaining electrons in an electrochemical reaction and an anode for losing electrons in the electrochemical reaction, in this embodiment, the first electrode plate 2 is an anode plate, for example, the second electrode plate 3 is a cathode plate, in another embodiment, the first electrode plate 2 is a cathode plate, for example, and the second electrode plate 3 is an anode plate, for example.

In this embodiment, a plurality of sets of flow channel inlets and outlets 100 are correspondingly disposed on the frame 101, the first electrode plate 2 and the second electrode plate 3, it should be noted that, in a single cell, for example, in a hydrogen fuel cell, flow channels are formed between the membrane electrode 1 and the electrode plate of the single cell in the reaction area 1011, and hydrogen, oxygen or air and cooling water are respectively supplied to pass through the flow channels to implement the oxidation-reduction reaction, and the flow channel inlets and outlets 100 are generally openings that are disposed through each flow channel in the thickness direction of the single cell, for example, in this embodiment, the flow channel inlets and outlets 100 are disposed on the frame 101 and at corresponding positions on the first electrode plate 2 and the second electrode plate 3.

A first sealing groove 10 is arranged between the first polar plate 2 and the membrane electrode 1, a second sealing groove 20 is arranged between the second polar plate 3 and the membrane electrode 1, the extending track of the first sealing groove 10 and the second sealing groove 20 bypasses one or more flow channel inlets and outlets 100, it is to be understood that the first sealing groove 10 is understood as a groove-shaped cavity formed between the first polar plate 2 and the membrane electrode 1 for filling liquid sizing material when the first polar plate 2 is attached to the membrane electrode 1, the second sealing groove 20 is understood as a groove-shaped cavity formed between the second polar plate 3 and the membrane electrode 1 when the second polar plate 3 is attached to the membrane electrode 1, the extending track of the first sealing groove 10 refers to the setting track of the first sealing groove on the membrane electrode 1 and the first polar plate 2, the extending track of the second sealing groove 20 refers to the setting track of the second sealing groove on the membrane electrode 1 and the second polar plate 3, and according to the sealing requirement, the extending track of the first sealing groove 10 and the second sealing groove 20 can be tracks which bypass and completely surround different flow channels 100, or can bypass but not completely surround all flow channels 100, or can be a combination of the first sealing groove 10 and the inlet and outlet 100 completely surround the flow channel 100.

The first polar plate 2 is provided with a first glue injection hole 21 and a first vent hole 22 on the extending track of the first sealing groove 10, the second polar plate 3 is provided with a second glue injection hole 31 and a second vent hole 32 on the extending track of the second sealing groove 20, specifically, the first sealing groove 10 and the second sealing groove 20 are formed at the position of the frame 101 of the membrane electrode 1, a single cell is communicated with the first sealing groove 10 through the first glue injection hole 21 and the first vent hole 22 at the outer part of the first polar plate 2, glue can be injected into the first sealing groove 10 through the first glue injection hole 21, the single cell is communicated with the second sealing groove 20 through the second glue injection hole 31 and the second vent hole 32 at the outer part of the second polar plate 3, and glue can be injected into the second sealing groove 20 through the second glue injection hole 31; the single cell is injected from the same points of the two sides towards the membrane electrode 1 through the first glue injection hole 21 and the second glue injection hole 31, the first sealing ring 4 is formed in the first sealing groove 10, the second sealing ring 5 is formed in the second sealing groove 20, the same points refer to the same points of the liquid glue material impacting the membrane electrode 1 when the two sides are injected, it is understood that when the first glue injection hole 21 and the second glue injection hole 31 are provided with a plurality of points, in some embodiments, the membrane electrode 1 is not provided with a hole communicating the first sealing groove 10 and the second sealing groove 20, the first sealing ring 4 and the second sealing ring 5 are respectively independent integrated glue injection sealing structures, in this embodiment, the membrane electrode 1 is provided with a hole communicating the first sealing groove 10 and the second sealing groove 20, so that the first sealing ring 4 and the second sealing ring 5 are communicated into an integrated structure when the two sides are injected simultaneously, and in the following embodiments are specifically described.

To sum up, in the single cell shown in this embodiment, through setting up in the single cell and being located the gluey route of first polar plate 2 and second polar plate 3 respectively, make the single cell can carry out the injecting glue in step in both sides, be provided with the exhaust route on first polar plate 2 and the second polar plate 3 respectively simultaneously, avoid the air pocket to appear in the air residue, can effectively improve the homogeneity and the synchronism of single cell in integrative injecting glue sealing connection in-process, effectively improve the uniformity of membrane electrode 1 both sides pressurized level, air residue when having avoided the injecting glue simultaneously to a great extent, prevent to form the air pocket, be favorable to improving the sealing connection effect after the injecting glue.

In this embodiment, the positions of the first glue injection hole 21 and the second glue injection hole 31 are corresponding, and in a conventional glue injection mold, the glue injection direction is generally perpendicular to the single cell, so that the positions of the liquid glue striking the membrane electrode 1 during glue injection on two sides are corresponding, and are two sides of the same position of the membrane electrode 1, so that the impacts of the glue injection on the two sides on the membrane electrode 1 cancel each other, and the deformation risk of the membrane electrode 1 is reduced.

In some other application scenarios, the setting positions of the first glue injection hole 21 and the second glue injection hole 31 do not correspond, and the setting direction of the runner in the mold can be adjusted, so that the directions of glue injection from two sides are positioned on the same straight line, further the point positions of the liquid glue material impacting the membrane electrode 1 during glue injection from two sides are the same, the liquid glue material is synchronously filled at two sides in a mode of matching with glue injection from two sides, and the impact of the glue injection from two sides to the membrane electrode 1 can be reduced.

As to the above embodiment, it should be noted that, since the first electrode plate 2 and the second electrode plate 3 are respectively provided with the first glue injection hole 21 and the second glue injection hole 31, and the positions of the first glue injection hole 21 and the second glue injection hole 31 correspond to each other, that is, in the thickness direction of the single cell, the first glue injection hole 21 and the corresponding second glue injection hole 31 are located on the same straight line, when the two sides of the single cell are synchronously injected, the two-side liquid glue materials enter the formed sealing grooves inside the single cell, that is, the first sealing groove 10 and the second sealing groove 20, respectively, from the first glue injection hole 21 and the second glue injection hole 31, the glue injection positions correspond to each other, so that the pressure of the two-side liquid glue materials on the membrane electrode 1 is consistent, and the positions of the liquid glue materials entering the first sealing groove 10 and the second sealing groove 20 correspond to each other, so that the flow in the first sealing groove 10 and the second sealing groove 20 has synchronism; in addition, since the first exhaust hole 22 is further formed in the first polar plate 2, the second exhaust hole 32 is further formed in the second polar plate 3, when the liquid rubber material is filled into the first sealing groove 10 and the second sealing groove 20, gas in the grooves is extruded by the liquid rubber material and is discharged from the first exhaust hole 22 and the second exhaust hole 32, imbalance in filling of the liquid rubber material due to residual air in the first sealing groove 10 and the second sealing groove 20 is prevented, the pressure on two sides of the membrane electrode 1 is inconsistent, and meanwhile, the phenomenon that residual air forms air pockets after the liquid rubber material is solidified is avoided, so that the sealing connection effect is affected.

In this embodiment, the first glue injection hole 21 is provided with a plurality of on the first polar plate 2, the second glue injection hole 31 is provided with a plurality of on the second polar plate 3, which is favorable for improving glue injection efficiency, a plurality of first glue injection holes 21 and second glue injection holes 31 are provided for dividing the first seal groove 10 and the second seal groove 20 into a plurality of flowing sections of liquid glue stock, and the branching sections are filled with the liquid glue stock synchronously, which is favorable for improving the synchronism of glue injection in the first seal groove 10 and the second seal groove 20, improving glue injection efficiency, and further favorable for ensuring the consistency of the flow of the liquid glue stock in the first seal groove 10 and the second seal groove 20.

In this embodiment, the number of the first glue injection holes 21 and the number of the second glue injection holes 31 are the same, and the aperture is the same, it is worth to say that, in the glue injection process, the liquid glue is injected under pressure, so in the thickness direction of the single cell, the flow speed of the liquid glue is extremely fast, and the thickness of the single cell is smaller, while in this embodiment, the number of the first glue injection holes 21 and the second glue injection holes 31 are corresponding, so in the process of synchronously injecting glue from two sides of the single cell, the liquid glue can be regarded as being synchronously injected into the first seal groove 10 and the second seal groove 20 and extruded to the membrane electrode 1, so the factors influencing the filling speed of the liquid glue in the first seal groove 10 and the second seal groove 20 are only the size of the inlet of the liquid glue into the first seal groove 10 and the size of the inlet of the second seal groove 20, namely the aperture of the first glue injection holes 21 and the second glue injection holes 31 are the same, in this embodiment, so that the liquid glue flows in the first seal groove 10 and the second seal groove 20 are not consistent, and the pressure of the first seal groove 20 is avoided from being deformed in time, and the deformation of the first seal groove 20 is avoided.

In this embodiment, at least one first exhaust hole 22 is disposed between two adjacent first glue injection holes 21, which is favorable for improving the exhaust effect and preventing the gas between two glue injection positions from not being discharged timely to form an air pocket in the process of injecting glue at the same time at the two glue injection positions.

Further, in this embodiment, along the extending direction of the first seal groove 10, the distance between the first vent hole 22 and the adjacent two first glue injection holes 21 is equal, and it should be understood that the distance is based on the extending direction of the first seal groove 10, that is, the extending lengths from the first seal groove 10 are equal, instead of the straight line distances being equal, in this structure, the distances between the first vent hole 22 and the adjacent two first glue injection holes 21 are equal, and after the glue is injected into the first glue injection holes 21 on both sides of the first vent hole 22, the time when the liquid glue flows from both sides to the first vent hole 22 is the same, so that in the first seal groove 10, the position where the first vent hole 22 is located is finally filled with the liquid glue, so as to facilitate sufficient gas discharge, thereby being beneficial to further improving the gas discharge effect, ensuring that the gas between the two first glue injection holes 21 can be discharged simultaneously when the first seal groove 10 is filled with the liquid glue, and preventing that the gas discharge between the two glue injection positions is not formed in time during the simultaneous glue injection at the two glue injection positions.

In this embodiment, at least one second exhaust hole 32 is disposed between two adjacent second glue injection holes 31, which is favorable for improving the exhaust effect and preventing the gas between two glue injection positions from not being discharged timely to form an air pocket in the process of injecting glue at the same time at the two glue injection positions.

Further, in the present embodiment, along the extending direction of the second sealing groove 20, the distance between the second air outlet hole 32 and the adjacent two second glue injection holes 31 is equal, it should be understood that the distance is based on the extending direction of the second sealing groove 20, that is, the extending length from the second sealing groove 20 is equal, instead of the straight line distance being equal, in this structure, the distance between the second air outlet hole 32 and the adjacent two second glue injection holes 31 is equal, after the glue is injected into the second glue injection holes 31 on both sides of the second air outlet hole 32, the time when the liquid glue flows from both sides to the second air outlet hole 32 is the same, so that the position of the second air outlet hole 32 is finally filled with the liquid glue in the second sealing groove 20, so as to facilitate the sufficient discharge of the gas, thereby being beneficial to further improving the air discharge effect, ensuring that the gas between the two second glue injection holes 31 can be discharged simultaneously when the second sealing groove 20 is filled with the liquid glue, and preventing that the gas between the two glue injection positions from forming no timely air pocket in the process of simultaneously injecting the liquid glue.

In this embodiment, the setting position of the first exhaust hole 22 corresponds to the setting position of the second exhaust hole 32, which is beneficial to ensure the consistency of the exhaust positions of the glue injection grooves at the two sides of the membrane electrode 1, and avoid uneven pressure at the two sides of the membrane electrode 1 caused by the difference of the exhaust positions.

In this embodiment, the extending tracks of the first seal groove 10 and the second seal groove 20 on the membrane electrode 1 are at least partially overlapped, and the membrane electrode 1 is provided with a channel hole 11 at the overlapping position of the extending tracks of the first seal groove 10 and the second seal groove 20, so that the first seal ring 4 and the second seal ring 5 formed by injecting glue are connected into an integral structure, and the first seal ring 4 and the second seal ring 5 form a paste structure, which is favorable for improving the integral sealing connection quality and avoiding the first seal ring 4 and the second seal ring 5 from moving to influence the sealing effect.

In this embodiment, the position of the channel hole 11 on the first sealing groove 10 corresponds to the first glue injection hole 21, and the position of the channel hole on the second sealing groove 20 corresponds to the second glue injection hole 31, which is beneficial to reducing the extrusion of the membrane electrode 1 when glue is injected from two sides respectively, and is beneficial to further avoiding the deformation of the membrane electrode 1 caused by compression in the glue injection process.

In another embodiment, referring to fig. 7, the difference between the other structures is that the number of the channel holes 11 formed in each set location is two, it can be understood that the set location is the area between the first glue injection hole 21 and the second glue injection hole 31 of the membrane electrode 1, after glue injection, two glue columns connected between the first seal groove 4 and the second seal groove 5 are formed at the set location of each channel hole 11, in other embodiments, the number of the channel holes 11 in each set location can be more than two according to the actual size, so that after glue injection, a plurality of glue columns connected between the first seal groove 4 and the second seal groove 5 are formed at the position between each first glue injection hole 21 and the second glue injection hole 31, which is beneficial to improving the connection strength between the first seal groove 10 and the second seal groove 20, further improving the integral sealing connection quality, and better avoiding the occurrence of play of the first seal groove 4 and the second seal groove 5.

In yet another embodiment, the membrane electrode 1 may not be provided with the channel hole 11, at this time, the first sealing ring 4 and the second sealing ring 5 are not communicated and are all of independent sealing structures, and the polar plate and the membrane electrode 1 may be further connected by gluing to improve the connection quality, so as to ensure that the first sealing ring 4 and the second sealing ring 5 are reliably fixed in the first sealing groove 10 and the second sealing groove 20, and the membrane electrode 1 is not provided with the channel hole 11, so that the structural integrity of the frame 101 is improved, the stress concentration risk can be reduced, and the possibility that reactants on two sides of the membrane electrode 1 cross each other when the connecting glue column formed by solidifying glue in the channel hole 11 is deformed can be avoided.

In this embodiment, the first electrode plate 2 is provided with a first protrusion facing the membrane electrode 1, the first protrusion is located in the first sealing groove 10, the second electrode plate 3 is provided with a second protrusion facing the membrane electrode 1, and the second protrusion is located in the second sealing groove 20, in this embodiment, the first protrusion and the second protrusion form a bead structure facing the membrane electrode 1, for example, by punching the first electrode plate 2 and the second electrode plate 3, and in other embodiments, the first protrusion and the second protrusion may also be protrusion mechanisms formed on the sides of the first electrode plate 2 and the second electrode plate 3 facing the membrane electrode 1 through casting, die casting or other processes, after the first sealing groove 10 and the second sealing groove 20 are filled with glue to form the first sealing ring 4 and the second sealing ring 5, the first protrusion forms a jogging with the first sealing ring 4, and the second protrusion forms a jogging with the second sealing ring 5, which is beneficial for ensuring stability of the sealing structure after the glue filling and preventing the sealing structure from dislocating from affecting the sealing effect.

In this embodiment, the first protrusion and the second protrusion are disposed opposite to each other and are all abutted to the membrane electrode 1, so that clamping can be formed on the membrane electrode 1, the overall structural strength of the single cell is improved, and deformation of the membrane electrode 1 in the glue injection process is further prevented.

In another embodiment, the present application also shows a single cell molding process, in which the single cell in the foregoing embodiment is integrally molded by using a molding die, referring to fig. 8, fig. 8 shows an application scenario of integrally molding the single cell by applying the single cell molding process, the molding die includes a movable die 72 and a fixed die 71, the fixed die 71 is provided with a first molding channel 711, the movable die 72 is provided with a second molding channel 721, and the single cell molding process includes the following steps:

stacking the first polar plate 2, the membrane electrode 1 and the second polar plate 3 into the cavity of the fixed mold 71, and aligning the first glue injection channel 711 with the first glue injection hole 21;

covering the movable mold 72 on one side of the cavity of the fixed mold 71 to press the stacked first polar plate 2, membrane electrode 1 and second polar plate 3, and aligning the second glue injection channel 721 with the first glue injection hole 21;

the first glue injection hole 21 and the second glue injection hole 31 are injected through the first glue injection channel 711 of the fixed die 71 and the second glue injection channel 721 of the movable die 72 at the same time, so that the liquid glue material is filled into the first seal groove 10 and the second seal groove 20 towards the same point of the membrane electrode 1 at the same time, and the gas in the first seal groove 10 and the second seal groove 20 is discharged through the electrode exhaust hole and the polar plate exhaust hole;

and after glue injection, curing to enable the liquid glue filled in the first sealing groove 10 and the second sealing groove 20 to be cured to form an integrated sealing structure connected with each other.

It should be noted that, in the above steps, the liquid glue material is filled to the first seal groove 10 and the second seal groove 20 synchronously towards the same point of the membrane electrode 1, which means that after the liquid glue material enters from two sides, the positions of the impact membrane electrode 1 are the same, so as to ensure that the glue pressures on two sides can be balanced, and avoid the deformation of the membrane electrode 1 caused by uneven pressure, for example, in another embodiment, please refer to fig. 9, which shows an application scenario of integrally injecting glue into a single cell by applying a single cell molding process, the glue channels on two sides of the membrane electrode 1 are not perpendicular to the single cell, the intersection points of the first glue injection channel 711 and the second glue injection channel 721 are inclined at a certain angle, but are the same point on the membrane electrode 1, so that when the glue materials are injected into the two sides of the membrane electrode 1, the impacts of the membrane electrode 1 are still balanced, and in other embodiments, when the positions of the first glue injection hole 21 and the second glue injection hole 31 are not intended to be aligned, the glue materials can be ensured by changing the setting angles of the first glue injection channel 711 and the second glue injection channel 721, so that the glue materials from the two sides of the first glue injection hole 21 and the second glue injection hole 31 are prevented from being damaged by the impact the same on the membrane electrode 1 when the two sides of the membrane electrode 1 is impacted by the same.

Further, in this embodiment, a third seal groove 722 is disposed between the outer side surface of the second pole plate 3 and the movable mold 72, the third seal groove 722 is connected with a glue injection channel on a mold at one side where the third seal groove 722 is located, and during glue injection, liquid glue is filled into the third seal groove 722 to form a third seal ring 6, so that the third seal ring 6 and the second seal ring 5 are directly connected into a whole, in other embodiments, the third seal groove 722 may also be opened on the fixed mold 71, so as to be located between the outer side surface of the first pole plate 2 and the fixed mold 71, and form a direct connection of the third seal ring 6 and the first seal ring 4 into a whole.

In the process of integrally forming the single cell through the single cell forming process, as glue inlet paths respectively positioned on the first polar plate 2 and the second polar plate 3 are arranged in the single cell, the single cell can synchronously carry out glue injection on two sides, and meanwhile, the first polar plate 2 and the second polar plate 3 are respectively provided with an exhaust path, so that air pockets are avoided to be remained, uniformity and synchronism of the single cell in the process of integrally injecting glue and sealing connection can be effectively improved, consistency of compression levels on two sides of the membrane electrode 1 is effectively improved, air residues during glue injection are avoided to a great extent, air pockets are prevented from being formed, and sealing connection effect after glue injection is improved.

In yet another embodiment, the present application further provides a battery module including a case, and a plurality of the above single cells stacked in the case.

According to the single cell applied to the battery module, the glue inlet paths of the first polar plate 2 and the second polar plate 3 are respectively arranged in the single cell, so that the single cell can be synchronously injected on two sides, meanwhile, the exhaust paths are respectively arranged on the first polar plate 2 and the second polar plate 3, air pockets are avoided to be remained, uniformity and synchronism of the single cell in an integrated glue injection sealing connection process can be effectively improved, uniformity of compression levels of two sides of the membrane electrode 1 is effectively improved, air residues during glue injection are avoided to a great extent, air pockets are prevented from being formed, and sealing connection effects after glue injection are improved.

The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness or are merely preferred embodiments of the present application for the purpose of fully illustrating the application, and are not intended to limit the scope of the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Therefore, all equivalent modifications and changes which have been accomplished by those skilled in the art without departing from the spirit and technical spirit of the present application are intended to be covered by the appended claims, and all such equivalent substitutions and modifications as would be within the scope of the present application are intended to be included in the present application.

Claims

1. A single cell, characterized by comprising:

2. The single cell according to claim 1, wherein: the first glue injection holes and the second glue injection holes are arranged at corresponding positions.

3. The single cell according to claim 2, wherein: the first glue injection holes are formed in the first polar plate, and the second glue injection holes are formed in the second polar plate.

4. A single cell according to claim 3, wherein: the first glue injection holes and the second glue injection holes are identical in number and aperture.

5. The single cell according to claim 4, wherein: at least one first exhaust hole is arranged between two adjacent first glue injection holes.

6. The single cell according to claim 5, wherein: and the first exhaust hole and two adjacent first glue injection holes are equal in distance along the extending direction of the first sealing groove.

7. The single cell according to claim 2, wherein: at least one second exhaust hole is arranged between two adjacent second glue injection holes.

8. The single cell according to claim 7, wherein: and the second exhaust hole and two adjacent second glue injection holes are equal in distance along the extending direction of the second sealing groove.

9. A single cell according to any one of claims 1-8, wherein: the arrangement position of the first exhaust hole corresponds to the arrangement position of the second exhaust hole.

10. The single cell according to claim 1, wherein: the extending tracks of the first sealing groove and the second sealing groove on the membrane electrode are at least partially overlapped, and the membrane electrode is provided with a channel hole at the overlapping position of the extending tracks of the first sealing groove and the second sealing groove, and the channel hole is used for connecting the first sealing ring and the second sealing ring formed by glue injection into a whole.

11. The single cell according to claim 10, wherein: the position of the channel hole, which is arranged on the first sealing groove, corresponds to the first glue injection hole, and the position of the channel hole, which is arranged on the second sealing groove, corresponds to the second glue injection hole.

12. The single cell according to claim 11, wherein: the number of the channel holes formed in each setting area is two or more.

13. The single cell according to claim 1, wherein: the first electrode plate is provided with a first bulge facing the membrane electrode, the first bulge is positioned in the first sealing groove, the second electrode plate is provided with a second bulge facing the membrane electrode, and the second bulge is positioned in the second sealing groove.

14. The single cell according to claim 13, wherein: the first bulge and the second bulge are oppositely arranged and are all abutted to the membrane electrode.

15. A process for molding a single cell, characterized in that the single cell as claimed in any one of claims 1 to 13 is molded by integrally injecting glue by using a glue injection mold, the glue injection mold comprises a movable mold and a fixed mold, a first glue injection channel is arranged on the fixed mold, a second glue injection channel is arranged on the movable mold, and the process for molding the single cell comprises the following steps:

16. The cell molding process according to claim 15, wherein: a third sealing groove is formed between the outer side face of the first polar plate and the fixed die or between the outer side face of the second polar plate and the movable die, the third sealing groove is connected with a glue injection channel on a die on one side where the third sealing groove is located, and liquid glue is filled into the third sealing groove to form a third sealing ring during glue injection, so that the third sealing ring is directly connected with the first sealing ring or the second sealing ring into a whole.

17. A battery module comprising a case, and a plurality of the single cells according to any one of claims 1 to 13 stacked in the case.