CN220585345U - Sealing mechanism, cover plate with sealing mechanism, cylinder body and single battery - Google Patents
Sealing mechanism, cover plate with sealing mechanism, cylinder body and single battery Download PDFInfo
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- CN220585345U CN220585345U CN202321783014.6U CN202321783014U CN220585345U CN 220585345 U CN220585345 U CN 220585345U CN 202321783014 U CN202321783014 U CN 202321783014U CN 220585345 U CN220585345 U CN 220585345U
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- 230000007246 mechanism Effects 0.000 title claims abstract description 68
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- 238000002955 isolation Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
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- MUBKMWFYVHYZAI-UHFFFAOYSA-N [Al].[Cu].[Zn] Chemical compound [Al].[Cu].[Zn] MUBKMWFYVHYZAI-UHFFFAOYSA-N 0.000 claims description 3
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Filling, Topping-Up Batteries (AREA)
Abstract
The utility model belongs to the field of batteries, and particularly relates to a sealing mechanism, a cover plate with the sealing mechanism, a cylinder body and a single battery. The problem that a sealing film layer on the existing battery shell is easy to fall off in advance or the sealing performance is unreliable is solved. Comprises a hollow component and a sealing film layer; the inner side of the hollow member, which is close to the first open end, is provided with a second annular plate along the circumferential direction of the hollow member; an annular groove is formed in the inner wall close to the second open end along the circumferential direction of the hollow member; the sealing film layer is positioned in the hollow member and seals the first open end of the hollow member; the sealing film layer comprises a dissolving layer and an isolating layer attached to the lower surface of the dissolving layer; the peripheral edge part of the isolation layer is contacted with the second annular plate of the hollow member; annular gaps are formed along the circumferential direction of the upper surface of the dissolving layer, a step structure is formed around the dissolving layer, and an annular glue injection space is formed between the annular gaps and the annular grooves on the hollow member; the annular glue injection space is used for containing sealing glue and fixing the sealing film layer on the hollow member.
Description
Technical Field
The utility model belongs to the field of batteries, and particularly relates to a sealing mechanism, a cover plate with the sealing mechanism, a cylinder body and a single battery.
Background
In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).
However, in the existing large-capacity battery, each single battery has a difference, and due to the existence of the barrel effect, the single battery with the worst performance is often affected, so that the upper limit of the capacity and the cycle number of the whole large-capacity battery are extremely limited. Therefore, how to improve the uniformity of each single battery in the large-capacity battery becomes an important point and a difficult point of research in the field.
In order to solve the above-mentioned problems, a related art has proposed a large-capacity battery including a battery pack body formed by connecting a plurality of unit cells in parallel and at least one hollow member; each single battery inner cavity comprises a gas area and an electrolyte area; the inner cavity of each single battery is communicated with the hollow member through the through hole formed in the outer shell of each single battery and the opening formed in the hollow member.
When the high-capacity battery is prepared, the sealing film layer is required to be arranged at the through hole, so that the inner cavity of the single battery is isolated from air, when electrolyte is injected from the outside to the inside of the battery shell through the hollow member, the electrolyte acts on the sealing film layer, so that the sealing film layer is opened, the electrolyte enters the inside of each battery shell, and the electrolytes and/or the gases in a plurality of battery shells circulate mutually, so that the batteries are in a uniform system, and the performance and the service life of the battery are improved.
As shown in fig. 1, although chinese patent CN218525645U discloses a battery case with a sealing film layer, specific mounting manners of the sealing film layer and the battery case are not described in detail, and the manner of determining reliable mounting and sealing performance of the sealing film layer is a technical problem to be solved urgently at present.
Disclosure of Invention
The utility model aims to provide a sealing mechanism, and a cover plate, a cylinder body and a single battery with the sealing mechanism. The problem that a sealing film layer on the existing battery shell is easy to fall off in advance or the sealing performance is unreliable is solved.
The technical scheme of the utility model is to provide a sealing mechanism for sealing a through hole on a single battery shell, which is characterized in that: comprises a hollow component and a sealing film layer;
the hollow member having a first open end and a second open end;
defining the position of the second open end as upper and the position of the first open end as lower;
a second annular plate is arranged on the inner side, close to the first open end, of the hollow member along the circumferential direction of the hollow member; an annular groove is formed in the inner wall close to the second open end along the circumferential direction of the hollow member;
the sealing film layer is positioned in the hollow member and seals the first open end of the hollow member;
the sealing film layer comprises a dissolving layer and an isolating layer attached to the lower surface of the dissolving layer;
the peripheral edge part of the isolating layer is contacted with the second annular plate of the hollow member;
an annular gap is formed along the circumferential direction of the upper surface of the dissolving layer, a step structure is formed around the dissolving layer, and an annular glue injection space is formed between the annular gap and an annular groove on the hollow member; the annular glue injection space is used for accommodating sealant and fixing the sealing film layer on the hollow member;
the isolating layer is not reacted with the electrolyte, and the dissolving layer is dissolved in the electrolyte; electrolyte is injected into the hollow component from the second open end, the dissolving layer is dissolved, and the isolation layer falls off, so that the first open end and the second open end of the hollow component are communicated.
Further, in order to prevent the separator layer from falling down and entering the inner cavity of the battery, the performance of the battery can be affected, and the sealing mechanism also comprises a filter sheet which is matched with the shape of the separator layer; the filter piece lamination is arranged below the isolation layer, and the peripheral edge part of the filter piece is fixed with the second annular plate of the hollow member.
Further, the sealing mechanism also comprises a sealing ring; the seal ring is disposed between the filter sheet and the second annular plate of the hollow member.
Further, a first annular plate is provided on the outside of the hollow member near the first open end in the circumferential direction of the hollow member.
Further, the water level in the step structure and the side wall of the annular groove close to the first open end are located on the same plane, and the upper surface of the dissolving layer and the side wall of the annular groove close to the second open end are located on the same plane.
Further, the material of the dissolution layer is electrolyte-soluble plastic, soluble rubber, or the like. For example, it may be at least one of PS (polystyrene plastic), PMMA (polymethyl methacrylate), SMMA (styrene-dimethyl methacrylate copolymer), TPU (thermoplastic polyurethane elastomer rubber), ABS (acrylonitrile/butadiene/styrene copolymer), POM (polyoxymethylene), PA6 (nylon 6), PA12 (nylon 12), and PVC (polyvinyl chloride).
Further, the material of the isolation layer is a material which does not react with the electrolyte, such as aluminum, copper, zinc, nickel, silver, epoxy resin, PE (polyethylene), PP (polypropylene), polytetrafluoroethylene or ethylene propylene diene monomer.
The utility model also provides a cover plate, which is characterized in that: and a through hole is formed in the cover plate body, and the sealing mechanism is arranged at the through hole.
The utility model also provides a cylinder body, which is characterized in that: the cylinder body is provided with a through hole, and the sealing mechanism is arranged at the through hole.
The utility model also provides a single battery, which is characterized in that: the battery comprises a shell, wherein the shell is provided with a through hole penetrating through the inner cavity of the single battery; the sealing mechanism is arranged at the through hole.
The beneficial effects of the utility model are as follows:
1. the sealing membrane layer (the isolation layer and the dissolution layer) is fixed on the hollow component, and is connected with the battery shell through the hollow component, so that the sealing of the through hole on the shell is realized; the inner wall of the hollow component is provided with a sealing film layer installation structure, the sealing film layer installation structure comprises a second annular plate and an annular groove, the isolation layer and the dissolution layer are arranged on the second annular plate, an annular gap is formed around the dissolution layer, the annular gap and the annular groove are matched to form an annular glue injection space, sealing glue is injected into the annular glue injection space, the isolation layer and the dissolution layer are fixed on the hollow component, the sealing film layer is not easy to fall off in advance, sealing of the contact part of the sealing film layer and the hollow component can be realized through the sealing glue, and the sealing performance of the sealing film layer is further improved.
2. In the embodiment, a filter disc can be additionally arranged, so that the problem of short circuit of the battery caused by external impurities entering the inner cavity of the single battery in the installation process of the sealing mechanism is avoided; the separation layer can be prevented from falling off and entering the inner cavity of the battery, and the problem that the performance of the battery is possibly influenced can be solved.
3. According to the utility model, the sealing ring is additionally arranged between the isolating layer and the second annular plate, so that the sealing performance of the sealing mechanism is further improved.
Drawings
FIG. 1 is a schematic view of a partial structure of a battery case having a sealing film layer in the related art;
FIG. 2 is a schematic structural view of a sealing mechanism of embodiment 1;
FIG. 3 is a schematic view of an exploded structure of a seal mechanism of embodiment 1;
fig. 4 is a schematic structural view of the hollow member in embodiment 1;
fig. 5 is a sectional view of the hollow member in embodiment 1;
FIG. 6 is a cross-sectional view of the sealing mechanism in embodiment 1;
FIG. 7 is a schematic view showing the structure of the dissolution layer in example 1;
FIG. 8 is a schematic structural view of a sealing mechanism after adding a filter sheet and a sealing ring in embodiment 1;
FIG. 9 is a schematic view of a partially enlarged structure of a sealing mechanism after the filter sheet and the seal ring are added in the embodiment 1;
FIG. 10 is a schematic diagram of an explosion structure of a sealing mechanism after the filter sheet and the sealing ring are added in the embodiment 1;
fig. 11 is a schematic structural view of a single cell having a sealing mechanism in embodiment 3;
fig. 12 is a schematic structural view of the large-capacity battery in example 4 and example 5;
fig. 13 is a schematic view of the structure of the partial explosion of the large-capacity battery in example 4 and example 5;
fig. 14 is a schematic view showing the structure of a partial explosion of the large-capacity battery in example 6;
the reference numerals in the drawings are:
01. a sealing film layer; 02. a battery case;
1. a hollow member; 11. a first open end; 12. a second open end; 13. a first annular plate; 14. a second annular plate; 141. a first surface of the second annular plate; 15. an annular groove; 2. an isolation layer; 21. a first surface of the isolation layer; 3. a dissolving layer; 31. a vertical surface; 32. a horizontal plane; 4. an annular glue injection space; 5. a seal ring; 6. a filter sheet; 7. sharing the pipeline assembly; 71. a hollow box body; 72. a cover plate; 8. and (3) a single battery.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, third, fourth, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The utility model provides a sealing mechanism which is used for sealing through holes in a single battery shell.
It should be noted that, the single battery is a square battery, and the square battery includes an upper cover plate, a lower cover plate, a cylinder, a cell assembly and electrolyte; the cell assembly may be referred to herein as an electrode assembly, which is assembled by sequentially arranging a positive electrode, a separator, and a negative electrode, using a lamination or winding process. The cell assembly described herein may also be a commercially available shell battery; the upper cover plate, the cylinder body and the lower cover plate form a square shell battery shell, and the battery core component and the electrolyte are positioned in the single battery shell.
The single battery provided by the utility model is mainly used for constructing a large-capacity battery (also called a battery pack or a battery module). Such high capacity batteries include a battery pack body and at least one shared conduit assembly; the battery pack main body comprises a plurality of unit batteries which are connected in parallel; the sharing pipeline component is fixed on the battery pack main body, and an opening which corresponds to and penetrates through the through hole of the single battery is formed in the sharing pipeline component.
If the through hole is formed in the lower cover plate of the single battery, the shared pipeline assembly can be used as an electrolyte shared pipeline, the sealing mechanism sealed on the through hole of the lower cover plate of each single battery is opened by utilizing the action of external force, and the electrolytes in the inner cavities of all the single batteries are communicated through the electrolyte shared pipeline, so that the electrolytes of all the single batteries are in the same system, the difference between the electrolytes of all the single batteries is reduced, the consistency between the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.
If the through hole is formed in the upper cover plate of the single battery, the shared pipeline assembly can also be used as a gas communication pipeline, the sealing mechanism sealed on the through hole of the upper cover plate of each single battery is opened by utilizing the action of external force, and the gas in the inner cavity of each single battery is communicated through the gas communication pipeline, so that the gas in the inner cavity of the whole large-capacity battery is balanced, and the cycle life of the large-capacity battery is prolonged to a certain extent.
If the through holes are formed in the side wall of the single battery cylinder body, the shared pipeline component can be used as an electrolyte shared pipeline and a gas communication pipeline at the same time, and the sealing mechanisms sealed on the side wall of each single battery cylinder body are opened by utilizing the action of external force, so that gas and electrolyte in each single battery can enter the shared pipeline component at the same time, at the moment, the gas is distributed in the upper half part of the shared pipeline component, and the electrolyte is distributed in the lower half part of the shared pipeline component; the gas-liquid sharing can be realized through one sharing pipeline component.
The utility model is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 2 and 3, a schematic structural diagram of a sealing mechanism provided in this embodiment includes a hollow member 1 and a sealing film layer, wherein the sealing film layer includes an isolation layer 2 and a dissolution layer 3.
As shown in fig. 4 and 5, in the present embodiment, the hollow member 1 is a hollow tube having both ends open. For convenience of description, two open ends of the hollow member 1 may be defined as a first open end 11 and a second open end 12, respectively, and the second open end 12 is defined as an upper position and the first open end 11 is defined as a lower position.
The first open end 11 is fixedly connected with the shell area around the through hole of the single battery 8.
The caliber of the first open end 11 can be slightly larger than that of the through hole of the shell of the single battery 8, and the first open end 11 can be fixed in the shell area around the through hole of the single battery 8 in a welding mode, and the orthographic projection of the first open end 11 on the shell completely covers the corresponding through hole.
The first annular plate 13 may be further disposed outside the first open end 11 along the circumferential direction of the hollow member 1, where the outer diameter of the first annular plate 13 is required to be larger than the caliber through hole of the housing through hole of the unit cell 8, and the caliber of the first open end 11 is not limited, that is, the caliber of the first open end 11 may be larger than, equal to, or smaller than the caliber of the housing through hole of the unit cell 8. The first annular plate 13 may be fixed to the outer case region around the through-hole of the unit cell 8 by welding. Compared with the other structural forms, the structure has no requirement on the shape caliber of the hollow member 1, and has better connection reliability and tightness with the shell of the single battery 8.
The shape of the second open end 12 is adapted to the shape of the opening on the shared pipeline assembly 7, and is used for fixedly connecting with the surrounding area of the opening of the shared pipeline assembly 7.
As can be seen from fig. 4 and 5, the present embodiment is provided with a second annular plate 14 along the circumferential direction of the hollow member 1 on the inner side of the hollow member 1 near the first open end 11; and an annular groove 15 is provided in the circumferential direction of the hollow member 1 near the inner wall of the second open end 12.
As can be seen from fig. 6, the shape of the isolation layer 2 is adapted to the cross-sectional shape of the hollow member 1, and the isolation layer may be made of aluminum, copper, zinc, nickel, silver, etc., and a thin layer is formed on the lower surface of the dissolution layer 3 by electroplating; or can also be materials insoluble in electrolyte such as epoxy resin, PE, PP, polytetrafluoroethylene, ethylene propylene diene monomer and the like, and can be generally coated on the lower surface of the dissolving layer 3 by adopting a nano injection molding process;
the shape of the dissolving layer 3 is also adapted to the cross-sectional shape of the hollow member 1. As can be seen from fig. 7, in this embodiment, an annular gap is formed around the dissolving layer 3 along the circumferential direction of the dissolving layer 3, a step structure is formed around the dissolving layer 3, for convenience of description, two adjacent surfaces in the step structure can be respectively defined as a vertical surface 31 and a horizontal surface 32, it can be seen from the figure that the horizontal surface 32 is flush with the side wall of the annular groove 15, which is close to the first open end 11, the upper surface of the dissolving layer 3 is flush with the side wall of the annular groove 15, which is close to the second open end 12, and the step structure around the dissolving layer 3 is matched with the annular groove 15 to form an annular glue injection space 4.
In other embodiments, the horizontal surface 32 may be slightly above or below the side wall of the annular recess 15 adjacent the first open end 11, and the plane of the dissolving layer 3 adjacent the second open end 12 may not be flush with the side wall of the annular recess 15 adjacent the second open end 12.
The sealing film layer is arranged in the hollow member, the peripheral edge part of the lower surface of the isolation layer 2 is contacted with the first surface of the second annular plate 14 on the inner wall of the hollow member 1, and the first open end 11 of the hollow member 1 is sealed;
in this embodiment, the sealing film layer is fixed in the hollow member 1 by encapsulating the organic sealing compound into the annular molding space 4. Wherein the organic sealing glue can be epoxy resin sealing glue or organic silicon resin sealing glue, etc.
The shared pipeline assembly 7 may take different structural forms, for example, a spliced shared pipeline assembly in chinese patent CN218525645U may be adopted (the shared pipeline assembly includes a pipeline disposed on an upper cover plate and a lower cover plate, and openings penetrating through holes on the upper cover plate and the lower cover plate are formed on the pipeline), when assembling, the sealing mechanism may be first installed after the upper cover plate and the lower cover plate with the pipeline (specifically, the second open end 12 of the hollow member may be first inserted into the openings from one side of the through holes, and the edges of the first open end are welded with the upper cover plate and the lower cover plate regions corresponding to the peripheries of the through holes, so as to complete the assembly of the sealing mechanism and the upper and lower cover plates), and then the upper and lower cover plates with the sealing mechanism are welded with the cylinder to form a single battery. And finally, assembling the high-capacity battery with the shared pipeline assembly in a squeezing connection mode.
The shared pipeline assembly 7 can also adopt a split shared pipeline assembly 7 structure, the split shared pipeline assembly 7 comprises a hollow box body 71 with one end being open, the other part is a cover plate 72 covering the opening of the hollow box body 71, and the opening is formed on the bottom of the hollow box body 71 opposite to the open end. When the sealing mechanism is specifically assembled, the sealing mechanism can be fixed at each single battery through hole (the through hole can be positioned on the upper cover plate, the lower cover plate or the side wall of the cylinder body) to form a single battery with the sealing mechanism; then the second open end 12 of the hollow component and at least part of the hollow component 1 of the sealing mechanism on each single battery are inserted into the opening of the shared pipeline component 7, then a welding head extends into the edge part of the opening from the open end of the hollow box 71, and each opening edge is welded with the outer wall of the corresponding hollow component 1 to realize sealing; when the end face of the second open end 12 is flush with the inner bottom surface of the hollow box 71, the end face of the second open end 12 can be directly welded with the edge of the opening, so that sealing is realized, and a high-capacity battery with a shared pipeline assembly is formed.
The electrolyte is injected into the shared pipeline assembly 7, so that the dissolving layer 3 can be automatically dissolved from the outside, and the isolating layer 2 and the hollow member 1 do not adopt any fixing mode, and the isolating layer 2 is a thin layer coated on the surface of the dissolving layer 3, and the thickness is generally tens to hundreds of micrometers; therefore, after the dissolution layer 3 is dissolved, the isolation layer 2 can automatically fall off from the hollow component, so that the shared pipeline component 7 is communicated with the inner cavity of the single battery 8, and the effect that the electrolyte of all the single batteries 8 is in the same system or the gas balance of the inner cavity of the large-capacity battery is achieved.
As shown in fig. 8 to 10, in order to further improve the sealing performance of the sealing mechanism, the present embodiment adds a seal ring 5 between the isolation layer 2 and the second annular plate 14. The sealing ring 5 can be made of red copper, aluminum or mica. The sealing ring 5 is reliable, durable and stable in sealing and cannot be aged. In this embodiment, the filter 6 with the shape matching with the isolation layer may be additionally provided, the filter 6 may be a metal mesh, or a hard filter film such as PP, PE, PTFE (polytetrafluoroethylene) may be fixedly connected to the inner wall of the hollow member, if made of metal, the filter film may be fixed by welding, and if made of hard filter film, the filter film may be fixed by bonding. In the process of installation, external impurities enter the inner cavity of the single battery 8, so that the problem of battery short circuit occurs, the separation layer can be prevented from falling off, the external impurities enter the inner cavity of the battery, and the problem of influence on the performance of the battery possibly occurs. The mesh number of the filter sheet needs to satisfy: the electrolyte can pass through while fragments of the separator cannot.
Example 2
This embodiment is a closure or cartridge with the sealing mechanism of embodiment 1.
The cover plate or the side wall of the cylinder body is provided with a through hole, and a sealing mechanism is arranged at the through hole, and the sealing mechanism can be fixed on the cover plate or the side wall of the cylinder body by adopting the following process, taking the sealing mechanism comprising a sealing ring and a filter disc as an example:
firstly, a sealing ring 5, a filter sheet 6 and a sealing film layer are sequentially stacked on a second annular plate 14 of the hollow member 1; the annular glue injection space 4 is filled with organic sealing glue, and the dissolving layer 3 is fixed in the hollow member 1 while sealing is realized. The filter sheet 6 is fixedly connected to the hollow member.
Next, the first open end 11 of the hollow member 1 is secured to the cap or barrel region around the through-hole. In this embodiment, the hollow member 1 with the first annular plate 13 disposed outside the first open end 11 is used, and the first annular plate 13 is fixed with the cover plate area or the barrel area around the through hole by fusion welding.
The following procedure may also be used to secure the sealing mechanism to the cover plate or the barrel sidewall:
first, the first open end 11 of the hollow member 1 is fixed to a cap region or a cylinder region around the through hole.
Secondly, a sealing ring 5, a filter sheet 6 and a sealing membrane layer are sequentially stacked on a second annular plate 14 of the hollow member 1; the filter sheet 6 is fixedly connected to the hollow member.
Finally, the annular glue injection space 4 is filled with organic sealing glue, and the dissolving layer 3 is fixed in the hollow member 1 while sealing is realized.
Example 3
This embodiment is a single cell 8 with the sealing mechanism of embodiment 1. The cell assembly in the unit cell 8 is an electrode assembly.
The lower cover plate, the upper cover plate, the barrel side wall or the lower cover plate and the upper cover plate of the single battery 8 are provided with through holes, and a sealing mechanism is arranged at the through holes, and the sealing mechanism can be fixed at the through holes by adopting the following processes, wherein the through holes are formed in the barrel side wall, and the sealing mechanism comprises a sealing ring and a filter disc, for example, as shown in fig. 11:
firstly, a sealing ring 5, a filter sheet 6 and a sealing film layer are sequentially stacked on a second annular plate 14 of the hollow member 1; the annular glue injection space 4 is filled with organic sealing glue, and the dissolving layer 3 is fixed in the hollow member 1 while sealing is realized. The filter sheet 6 is fixedly connected to the hollow member.
Next, the first open end 11 of the hollow member 1 is secured to the barrel sidewall region around the through hole.
The following procedure may also be used to secure the sealing mechanism at the through hole:
firstly, fixing the first open end 11 of the hollow member 1 with the barrel side wall region around the through hole;
secondly, a sealing ring 5, a filter sheet 6 and a sealing membrane layer are sequentially stacked on a second annular plate 14 of the hollow member 1;
finally, the annular glue injection space 4 is filled with organic sealing glue, and the dissolving layer 3 is fixed in the hollow member 1 while sealing is realized.
Since the inner cavity of the outer case is an electrode assembly in this embodiment, the above-mentioned process is preferably performed in an environment having a dew point of-20 ℃ to-40 ℃ and a humidity of 1% or less, a temperature of 23 ℃ ± 2 ℃ and a cleanliness of 10 ten thousand stages.
Example 4
This embodiment is a single cell 8 with the sealing mechanism of embodiment 1. Unlike example 3, the cell assembly in the unit cell 8 was a commercially available case cell.
Specifically, the following process may be adopted to fix the sealing mechanism at the through hole of the unit cell 8, and the through hole is located on the side wall of the cylinder, and the sealing mechanism includes a sealing ring and a filter, and the specific structure is the same as that in fig. 11:
step one, an opening which is communicated with a through hole of the shell is formed in the side wall of a cylinder body of the commercial shell battery, the commercial shell battery with the opening is arranged in the shell with the open top, and the upper cover plate is used for sealing the open top of the shell.
Step two, sequentially stacking a sealing ring 5, a filter plate 6 and a sealing film layer on a second annular plate 14 of the hollow member 1; the annular glue injection space 4 is filled with organic sealing glue, and the dissolving layer 3 is fixed in the hollow member 1 while sealing is realized. The filter sheet 6 is fixedly connected to the hollow member.
And thirdly, fixing the first open end 11 of the hollow member 1 with the barrel side wall area around the through hole.
The following procedure may also be used to secure the sealing mechanism at the through hole:
step one, an opening which is communicated with a through hole of the shell is formed in the side wall of a cylinder body of the commercial shell battery, the commercial shell battery with the opening is arranged in the shell with the open top, and the upper cover plate is used for sealing the open top of the shell.
Welding and fixing the first open end 11 of the hollow member 1 and the barrel side wall area around the through hole, and sequentially penetrating the opening of the commercially available shell battery, the through hole of the outer shell and the hollow member 1;
step three, sequentially stacking a sealing ring 5, a filter plate 6 and a sealing membrane layer on a second annular plate 14 of the hollow member 1;
and step four, encapsulating organic sealing glue into the annular glue injection space 4, and fixing the dissolving layer 3 in the hollow member 1 while sealing is realized.
In order to prevent the influence of the welding process on the inner cavity environment of the commercial shell battery and to prevent the electrolyte leakage when the commercial shell battery with the opening is put into the shell, in the first step, after the opening is formed in the commercial shell battery, the opening is temporarily sealed by the sealing piece and then put into the shell, and after the first open end 11 of the hollow member 1 is welded and fixed with the barrel side wall area around the through hole, the sealing piece at the opening part is torn, so that the opening of the commercial shell battery, the through hole of the shell and the hollow member 1 are sequentially communicated.
After the sealing sheet at the opening of the commercial case battery is torn, the third and fourth steps are preferably performed in an environment with dew point standard of-20 ℃ to-40 ℃ and humidity of 1% or less and temperature of 23 ℃ +/-2 ℃ and cleanliness of 10 ten thousand levels.
Example 5
The present embodiment is a large-capacity battery in which the cell assembly in each unit cell 8 is an electrode assembly, that is, the unit cell 8 in embodiment 3 is employed.
As shown in fig. 12 and 13, the large-capacity battery includes a battery pack main body and at least one shared piping assembly 7; wherein the battery pack body comprises a plurality of parallel single batteries 8; the shared pipeline assembly 7 is fixed on the battery pack main body, and the shared pipeline assembly 7 is provided with an opening which corresponds to and penetrates through the through hole of the single battery 8. In this embodiment, a split type shared pipeline assembly 7 is adopted, and one part of the split type shared pipeline assembly 7 is a hollow box 71 with an open end, and the other part is a cover plate 72 covering the open end of the hollow box 71, and the opening is formed on the bottom of the hollow box 71 opposite to the open end.
The following processes can be adopted to fix the sealing mechanism on the shell of the single battery 8 and the shared pipeline assembly 7, the through holes are formed in the lower cover plate and the upper cover plate of the single battery 8, the shared pipeline assembly 7 is used as an electrolyte shared pipeline and a gas communication pipeline, and the sealing mechanism comprises a sealing ring and a filter disc as an example:
step one, preparing a plurality of single batteries 8 with sealing mechanisms on an upper cover plate and a lower cover plate according to the method in the embodiment 3;
inserting the second open end 12 of each hollow member 1 and at least part of the hollow members 1 into the openings of the shared pipeline assembly 7, extending the welding head from the open end of the hollow box 71 into the edge parts of the openings, and welding each opening edge with the outer wall of the corresponding hollow member 1 to realize sealing; when the end face of the second open end 12 is flush with the inner bottom surface of the hollow box 71, the end face of the second open end 12 can be directly welded with the edge of the opening to realize sealing;
and step three, sealing the opening of the hollow box 71 by using the cover plate 72.
Finally, after electrolyte is injected into the shared pipeline assembly 7, the dissolving layer 3 can be automatically dissolved from the outside, after the dissolving layer 3 is dissolved, the isolating layer 2 falls off (can not enter the inner cavities of all the single batteries under the blocking of the filter plate), the shared pipeline assembly 7 is communicated with the inner cavities of the single batteries 8, and then the electrolyte of all the single batteries 8 is in the same system, so that the gas of all the single batteries 8 is communicated, and the gas balance is achieved.
Example 6
The present embodiment is a large-capacity battery, and unlike embodiment 5, the cell assembly in each unit cell 8 in the large-capacity battery is a commercially available case battery. Namely, the single cell 8 in example 4 was used.
Specifically, the following processes can be adopted to fix the sealing mechanism on the casing of the single battery 8 and the shared pipeline assembly 7, the through hole is formed in the side wall of the cylinder of the single battery 8, the shared pipeline assembly 7 is used as an electrolyte shared pipeline and a gas communication pipeline, and the sealing mechanism comprises a sealing ring and a filter, for example, as shown in fig. 14:
step one, a plurality of single batteries 8 with sealing mechanisms are prepared according to the method in example 4;
inserting the second open end 12 of each hollow member 1 and at least part of the hollow members 1 into the openings of the shared pipeline assembly 7, extending the welding head from the open end of the hollow box 71 into the edge parts of the openings, and welding each opening edge with the outer wall of the corresponding hollow member 1 to realize sealing; when the end face of the second open end 12 is flush with the inner bottom surface of the hollow box 71, the end face of the second open end 12 can be directly welded with the edge of the opening to realize sealing;
and step three, sealing the opening of the hollow box 71 by using the cover plate 72.
Finally, after electrolyte is injected into the shared pipeline assembly 7, the dissolving layer 3 can be automatically dissolved from the outside, after the dissolving layer 3 is dissolved, the isolating layer 2 falls off (can not enter the inner cavities of all the single batteries under the blocking of the filter plate), the shared pipeline assembly 7 is communicated with the inner cavities of the single batteries 8, and then the electrolyte of all the single batteries 8 is in the same system, so that the gas of all the single batteries 8 is communicated, and the gas balance is achieved.
Claims (10)
1. A sealing mechanism for sealing the through-hole on the battery cell shell, its characterized in that: comprises a hollow component (1) and a sealing film layer;
the hollow member (1) has a first open end (11) and a second open end (12);
defining the position of the second open end (12) as upper and the position of the first open end (11) as lower;
the inner side, close to the first open end (11), of the hollow member (1) is provided with a second annular plate (14) along the circumferential direction of the hollow member (1), and an annular groove (15) is formed along the circumferential direction of the hollow member (1), close to the inner wall of the second open end (12);
the sealing film layer is positioned in the hollow member (1) and seals the first open end (11) of the hollow member (1);
the sealing film layer comprises a dissolving layer (3) and an isolating layer (2) attached to the lower surface of the dissolving layer (3);
the peripheral edge part of the isolation layer (2) is contacted with a second annular plate (14) of the hollow member (1);
annular gaps are formed along the circumferential direction of the upper surface of the dissolving layer (3), a step structure is formed around the dissolving layer (3), and an annular glue injection space (4) is formed between the annular gaps and an annular groove (15) on the hollow member (1); the annular glue injection space (4) is used for accommodating sealant and fixing the sealing film layer on the hollow member (1);
the isolating layer (2) is not reacted with the electrolyte, and the dissolving layer (3) is dissolved in the electrolyte; electrolyte is injected into the hollow member (1) from the second open end (12), the dissolution layer (3) is dissolved, and the isolation layer (2) falls off, so that the first open end (11) and the second open end (12) of the hollow member (1) are communicated.
2. The sealing mechanism of claim 1, wherein: the filter piece (6) is matched with the shape of the isolation layer; the filter plates (6) are arranged below the isolation layer (2) in a laminated mode, and the peripheral edge portions of the filter plates (6) are fixed with the second annular plate (14) of the hollow member (1).
3. The sealing mechanism of claim 2, wherein: also comprises a sealing ring (5); the sealing ring (5) is arranged between the filter sheet (6) and the second annular plate (14) of the hollow member (1).
4. A sealing mechanism according to any one of claims 1 to 3, wherein: the outer side of the hollow member (1) close to the first open end (11) is provided with a first annular plate (13) along the circumferential direction of the hollow member (1).
5. The sealing mechanism of claim 4, wherein: in the step structure, a horizontal plane (32) and the side wall of the annular groove (15) close to the first open end (11) are located on the same plane, and the upper surface of the dissolving layer (3) and the side wall of the annular groove (15) close to the second open end (12) are located on the same plane.
6. A sealing mechanism according to any one of claims 1 to 3, wherein: the material of the dissolving layer (3) is one of PS, PMMA, SMMA, TPU, ABS, POM, PA, PA12 and PVC.
7. A sealing mechanism according to any one of claims 1 to 3, wherein: the isolation layer (2) is made of aluminum, copper, zinc, nickel, silver, epoxy resin, PE, PP, polytetrafluoroethylene or ethylene propylene diene monomer.
8. A cover plate, characterized in that: a through hole is formed in the cover plate body, and the sealing mechanism of any one of claims 1 to 7 is arranged at the through hole.
9. A barrel, characterized in that: a through hole is formed in the cylinder body, and the sealing mechanism of any one of claims 1 to 7 is arranged at the through hole.
10. A single cell, characterized in that: the battery pack comprises a shell, wherein the shell is provided with a through hole penetrating through the inner cavity of the single battery; the through hole is provided with the sealing mechanism of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321783014.6U CN220585345U (en) | 2023-07-08 | 2023-07-08 | Sealing mechanism, cover plate with sealing mechanism, cylinder body and single battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321783014.6U CN220585345U (en) | 2023-07-08 | 2023-07-08 | Sealing mechanism, cover plate with sealing mechanism, cylinder body and single battery |
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| Publication Number | Publication Date |
|---|---|
| CN220585345U true CN220585345U (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321783014.6U Active CN220585345U (en) | 2023-07-08 | 2023-07-08 | Sealing mechanism, cover plate with sealing mechanism, cylinder body and single battery |
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| Country | Link |
|---|---|
| CN (1) | CN220585345U (en) |
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2023
- 2023-07-08 CN CN202321783014.6U patent/CN220585345U/en active Active
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