CN216818575U - Sealing structure of lithium battery liquid injection hole and lithium battery - Google Patents
Sealing structure of lithium battery liquid injection hole and lithium battery Download PDFInfo
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- CN216818575U CN216818575U CN202220519028.6U CN202220519028U CN216818575U CN 216818575 U CN216818575 U CN 216818575U CN 202220519028 U CN202220519028 U CN 202220519028U CN 216818575 U CN216818575 U CN 216818575U
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Abstract
The utility model relates to a sealing structure of a lithium battery liquid injection hole and a lithium battery. The utility model provides a sealing structure in lithium cell notes liquid hole, is including setting up the notes liquid hole on the top cap piece, its characterized in that, annotate the step form through-hole of liquid hole for setting up on the top cap piece, it is protruding to be provided with the annular with top cap piece integrated into one piece around the liquid hole to annotate, annotate the downthehole sealing plug that is provided with of liquid, the annular is protruding to be covered and to be pressed at the sealing plug top, seals and withholds the sealing plug. The utility model realizes sealing by compressing the sealing plug by the extruded annular bulge structure, and has simple structure, good sealing effect and low cost; the sealing plug is adopted for sealing, so that the corrosion problem is not easy to occur, and the leakage caused by the temperature change is avoided; when in liquid injection, the annular bulge on the periphery of the liquid injection hole can prevent the electrolyte from flowing to the periphery to corrode other positions of the part.
Description
Technical Field
The utility model relates to the technical field of energy storage devices, in particular to a sealing structure of a lithium battery liquid injection hole and a lithium battery.
Background
As an energy storage unit, a battery is increasingly widely applied to the electric vehicle industry and the energy storage industry, wherein a square aluminum shell battery cell is dominant.
The liquid injection hole and the sealing mode of square aluminum shell battery cell structure on the market have two kinds:
the first is a steel ball smashing sealing mode, the steel ball is easy to corrode, so that the nickel content in the steel ball needs to be increased, the steel ball is made of two materials, the two materials have different coefficients of thermal expansion and cold contraction and are inelastic, the steel ball smashing mode has the risk of poor sealing after long-term high-temperature and low-temperature use, and in addition, the steel ball smashing mode enables a liquid injection hole to be incapable of being enlarged, so that the liquid injection speed of the battery is influenced.
The second is for adopting the plastic nail temporarily sealed, and the aluminium nail reaches notes liquid hole laser welding and realizes final sealed mode. Because of the plastic nail has certain sealed effect, even do not weld the aluminium nail, also can have very big proportion and can't detect out electric core gas leakage through helium detection, because of the aluminium nail adopts the mode of laser welding again, and the laser welding has the probability of failure, has the possibility of gas leakage. Above-mentioned two kinds of factors are synthesized together, and the plastic nail has kept interim sealed and the unable condition of welding gas leakage appears in the aluminum nail can't be detected, if this kind of defective products flow to customer, can cause serious consequence.
Therefore, a simpler and more effective sealing structure of the lithium battery liquid injection hole is urgently needed in the market.
SUMMERY OF THE UTILITY MODEL
The utility model provides a sealing structure of a lithium battery liquid injection hole and a lithium battery for solving the technical problems.
The technical scheme adopted by the utility model is as follows:
the utility model provides a sealing structure of lithium cell notes liquid hole, is including setting up the notes liquid hole on the top cap piece, its characterized in that, annotate the liquid hole for setting up the step form through-hole on the top cap piece, it is protruding to be provided with the annular with top cap piece integrated into one piece around the liquid hole of annotating, annotate the downthehole sealing plug that is provided with of liquid, the annular is protruding to be covered and to be pressed at the sealing plug top, seals and withholds the sealing plug.
Further, the sealing plug comprises a sealing sheet and a sealing column, the sealing sheet is matched with the step part of the liquid injection hole, and the sealing column is in interference fit with the through hole of the liquid injection hole. Thus, the sealing sheet and the sealing column are combined to effectively seal the liquid filling hole.
Furthermore, the bottom end of the sealing column penetrates out of the bottom end of the liquid injection hole.
Furthermore, the bottom end of the sealing column is provided with a conical end. Thus, the conical end has a guiding function, so that the sealing plug is more easily plugged into the liquid injection hole.
Further, the sealing fin top is provided with the knurling texture, annular protrusion inside is provided with the knurling texture. Like this, the inside knurling texture of gasket top and annular arch can increase area of contact, makes to combine inseparabler between gasket and the annular arch, improves the protruding sealed effect to the gasket of annular.
Further, the planar shape of the sealing sheet is circular or regular polygon.
Furthermore, the bottom of the step part of the liquid injection hole is provided with a first chamfer. Thus, the first chamfer can reduce the residue of the liquid injection at the bottom of the stepped part of the liquid injection hole.
Furthermore, a second chamfer is arranged at the joint of the step part of the liquid injection hole and the through hole. Thus, the second chamfer angle can enable the injection liquid to flow down from the step part of the injection hole more quickly, and the residual injection liquid is reduced.
Further, the sealing plug is made of fluororubber.
The utility model also provides a lithium battery which comprises the sealing structure of the lithium battery liquid injection hole.
The technical scheme provided by the utility model has the following benefits:
1. the utility model adopts the annular bulge structure which is integrated with the top cover plate and arranged around the liquid injection hole, and the independent sealing plug is placed between the annular bulge and the liquid injection through hole, the annular bulge is covered and pressed on the top of the sealing plug, and the sealing plug is compressed by utilizing the extruded annular bulge structure to realize sealing, so the sealing effect is good.
2. The utility model adopts the plastic sealing plug for sealing, is not easy to corrode and can not leak gas due to temperature change.
3. According to the utility model, the first chamfer is arranged at the bottom of the step part of the liquid injection hole, the second chamfer is arranged at the joint of the step part of the liquid injection hole and the through hole, and the first chamfer and the second chamfer can reduce the residual liquid injection at the bottom of the step part of the liquid injection hole.
4. When the liquid injection hole is used for injecting liquid, the annular bulges on the periphery of the liquid injection hole can prevent electrolyte from flowing to the periphery to corrode other positions of a part.
Drawings
Fig. 1 is an exploded view of a lithium battery in an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of the annular protrusion before spinning in the embodiment of the utility model.
FIG. 3 is a schematic cross-sectional view of the annular protrusion before spinning according to an embodiment of the present invention.
Fig. 4 is a schematic view of the sealing plug according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of the circular protrusion after spinning according to the embodiment of the present invention.
FIG. 6 is a schematic structural diagram of the annular protrusion after spinning according to the embodiment of the utility model.
FIG. 7 is an enlarged schematic view of the fluid injection hole of FIG. 3.
In the figure: 1. the sealing structure comprises a top patch, 2, a top cover plate, 3, an adapter sheet, 4, a core package, 5, a core package protective film, 6, a shell, 7, an insulating film, 201, a liquid injection hole, 202, an annular protrusion, 204, a spun annular protrusion, 8, a sealing plug, 801, a sealing sheet, 802, a sealing column, 803, a conical end, 9, a first chamfer, 10 and a second chamfer.
Detailed Description
The utility model is described in detail below with reference to the figures and the specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
If 1 ~ 7 show, a sealing structure of lithium cell notes liquid hole, including setting up notes liquid hole 201 on top cap piece 2, its characterized in that, annotate liquid hole 201 for setting up the step form through-hole on top cap piece 2, annotate liquid hole 201 around be provided with top cap piece 2 integrated into one piece's annular protruding 202, annotate the downthehole sealing plug 8 that is provided with of liquid, the protruding 202 cover of annular is pressed at sealing plug 8 top, seals and withholds sealing plug 8.
As shown in fig. 4, the sealing plug 8 includes a sealing sheet 801 and a sealing post 802. As shown in fig. 5, the sealing sheet 801 is fitted to the step of the pour hole 201, and the sealing post 802 is fitted into the through hole of the pour hole 201 in an interference manner. The bottom of the sealing column 802 penetrates out of the bottom end of the liquid injection hole 201, the bottom end of the sealing column 802 is provided with a conical end 803, and when the sealing plug 8 is plugged into the liquid injection hole 201, the conical end 803 has a guiding effect, so that the sealing plug 8 is more easily plugged into the liquid injection hole 201.
The sealing fin 801 top is provided with the knurling texture, annular bulge 202 is inside to be provided with the knurling texture. Thus, when the annular protrusion 202 is covered on the top of the sealing plate 801 after spinning, the contact area can be increased by the top of the sealing plate 801 and the embossing texture inside the annular protrusion 202, so that the sealing plate 801 and the annular protrusion 202 are combined more tightly, and the sealing effect of the annular protrusion 202 on the sealing plate 801 is improved.
The planar shape of the sealing sheet 801 can be circular or regular polygon, so that the liquid filling nozzle of a liquid filling machine can be conveniently positioned. Correspondingly, the shape of the step part of the liquid injection hole 201 is matched with the shape of the sealing sheet 801.
As shown in FIG. 7, a first chamfer 9 is provided at the bottom of the step part of the liquid injection hole 201, and a second chamfer 10 is provided at the joint of the step part of the liquid injection hole 201 and the through hole. The first chamfer 9 can reduce the residual liquid injection at the bottom of the step part of the liquid injection hole, and the second chamfer 10 can make the liquid injection flow down from the step part of the liquid injection hole more quickly, thereby further reducing the residual liquid injection.
Punching liquid injection hole 201 and annular bulge 202 around the liquid injection hole on top cover plate 2, carrying out laser cleaning on liquid injection hole 201 and annular bulge 202 around the liquid injection hole, putting sealing plug 8 into annular bulge 202 inside bottom cover liquid injection hole 201, pressing annular bulge 202 into spun annular bulge 204 with spinning equipment, spun annular bulge 204 extrudes sealing strip 801 with liquid injection hole 201 upper surface, realize sealedly through the mode that sealing strip 801 is compressed, sealing post 802 sets up and realizes further sealedly in annotating liquid hole 201 through-hole, the sealing strip material can select fluororubber.
The top cover plate is provided with a liquid injection hole penetrating through the top cover plate, a circle of annular convex structure is arranged around the liquid injection hole, and the annular convex structure and the top cover plate are integrally formed in a punching mode. Design independent gasket, annotate the liquid hole to the battery and the protruding inside back of annular, put into the annular with the gasket and annotate between the liquid through-hole, use spinning equipment with the annular protruding to annular center and gasket direction extrusion, the protruding structure compression seal circle of annular after being extruded realizes sealing in addition.
The utility model not only can solve the problems of the two existing liquid injection holes and sealing modes, but also can ensure 100 percent of sealing. Compared with the mode of laser welding in the market, the utility model adopts the spinning mode, so that the equipment investment is much less than that of a laser welding machine, and the equipment investment cost can be reduced; the utility model does not need an aluminum nail structure, and reduces the cost of raw materials. Compared with the method of smashing steel balls in the market, the utility model has the advantages that the problem of corrosion is avoided, and the leakage caused by temperature change is avoided. When the liquid injection hole is used for injecting liquid, the annular bulges on the periphery of the liquid injection hole can prevent electrolyte from flowing to the periphery to corrode other positions of a part.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (10)
1. The utility model provides a sealing structure of lithium cell notes liquid hole, is including setting up notes liquid hole (201) on top cap piece (2), a serial communication port, annotate liquid hole (201) for setting up the step form through-hole on top cap piece (2), it is provided with around liquid hole (201) protruding (202) of annular with top cap piece (2) integrated into one piece to annotate, be provided with sealing plug (8) in annotating liquid hole (201), annular protruding (202) are covered and are pressed at sealing plug (8) top, seal sealing plug (8) are lived in the sealing.
2. The sealing structure of the lithium battery injection hole according to claim 1, wherein the sealing plug (8) comprises a sealing sheet (801) and a sealing column (802), the sealing sheet (801) is matched with the step part of the injection hole (201), and the sealing column (802) is in interference fit with the through hole of the injection hole (201).
3. The sealing structure of the lithium battery electrolyte filling hole according to claim 2, wherein the bottom end of the sealing post (802) penetrates through the bottom end of the electrolyte filling hole (201).
4. The sealing structure of the lithium battery injection hole according to claim 3, wherein the bottom end of the sealing column (802) is provided with a tapered end (803).
5. The sealing structure of the lithium battery filling hole according to claim 2, wherein the sealing sheet (801) is provided with an embossed texture on the top, and the annular protrusion (202) is provided with an embossed texture inside.
6. The sealing structure of the lithium battery injection hole according to claim 5, wherein the planar shape of the sealing sheet (801) is a circle or a regular polygon.
7. The sealing structure of the lithium battery filling hole according to claim 1, wherein the bottom of the step part of the filling hole (201) is provided with a first chamfer (9).
8. The sealing structure of the lithium battery filling hole according to claim 7, wherein a second chamfer (10) is arranged at the joint of the step part of the filling hole (201) and the through hole.
9. The sealing structure of the lithium battery injection hole according to claim 1, wherein the sealing plug (8) is made of fluororubber.
10. A lithium battery comprising the sealing structure of the lithium battery pour hole of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220519028.6U CN216818575U (en) | 2022-03-10 | 2022-03-10 | Sealing structure of lithium battery liquid injection hole and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220519028.6U CN216818575U (en) | 2022-03-10 | 2022-03-10 | Sealing structure of lithium battery liquid injection hole and lithium battery |
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| CN216818575U true CN216818575U (en) | 2022-06-24 |
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| CN202220519028.6U Active CN216818575U (en) | 2022-03-10 | 2022-03-10 | Sealing structure of lithium battery liquid injection hole and lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221095A1 (en) * | 2022-05-20 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | Battery end cover assembly, battery cell, battery and electric device |
-
2022
- 2022-03-10 CN CN202220519028.6U patent/CN216818575U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221095A1 (en) * | 2022-05-20 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | Battery end cover assembly, battery cell, battery and electric device |
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