CN219917545U - Battery liquid injection hole sealing structure, battery cover plate and battery - Google Patents
Battery liquid injection hole sealing structure, battery cover plate and battery Download PDFInfo
- Publication number
- CN219917545U CN219917545U CN202321679287.6U CN202321679287U CN219917545U CN 219917545 U CN219917545 U CN 219917545U CN 202321679287 U CN202321679287 U CN 202321679287U CN 219917545 U CN219917545 U CN 219917545U
- Authority
- CN
- China
- Prior art keywords
- battery
- hole
- conical
- liquid injection
- nail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 129
- 239000007788 liquid Substances 0.000 title claims abstract description 50
- 238000002347 injection Methods 0.000 title claims abstract description 44
- 239000007924 injection Substances 0.000 title claims abstract description 44
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000003792 electrolyte Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a battery sealing structure, a battery cover plate and a battery. The battery sealing structure comprises an elastic sealing nail, wherein the elastic sealing nail is provided with a round table part, and the small end of the round table part is provided with a limiting part; the round platform part is suitable for the conical through hole of the liquid injection counter bore on the battery cover plate, and the limiting part is used for being clamped at the bottom of the conical through hole after the round platform part is completely pressed into the conical through hole so as to limit and fix the elastic sealing nail. According to the utility model, after the round table part is completely pressed into the conical through hole, the limiting part is clamped at the bottom of the conical through hole, so that the elastic sealing nail is limited and fixed, not only is the elastic sealing nail prevented from falling into a battery during sealing, but also the elastic sealing nail is prevented from being reversely extruded, the elastic sealing nail is effectively fixed in the conical through hole of the liquid injection counter bore, the effect of effectively sealing the liquid injection hole of the battery can be achieved, and the air tightness meets the sealing requirement.
Description
Technical Field
The utility model relates to the technical field of battery liquid injection hole sealing, in particular to a battery liquid injection hole sealing structure, a battery cover plate and a battery.
Background
At present, after lithium ion battery secondary annotates liquid, generally adopt the plastic nail to annotate the liquid counter bore and seal in advance to guarantee that just injected electrolyte does not reveal, this plastic nail relies on the frictional force with annotating the liquid counter bore to fix the position, after the battery produces gas through certain charge and discharge, cause the inside atmospheric pressure of battery to increase, when the pressure that inside atmospheric pressure given to the plastic nail is greater than frictional force, can push out the plastic nail, the plastic nail will no longer can provide sealed effect this moment, therefore current conventional scheme can reuse laser welding's method welding a sealing nail above the plastic nail for provide long-term sealed effect, the plastic nail only is as temporary sealing member.
When the sealing nails are welded, the high temperature generated by laser can cause residual electrolyte and other pollutants to be gasified, so that the stability of a laser welding pool is affected, a explosion point is generated, poor air tightness is caused, and the battery is scrapped. Meanwhile, the plastic nail provides temporary sealing capability, so that the defects of tiny pinholes, cracks and the like in the welding of the sealing nail are difficult to detect in a conventional helium detection mode and the like, and the outflow risk of defective products exists, and therefore, a new structure or process is urgently needed to improve the safety performance of the battery.
Disclosure of Invention
The utility model aims at solving the problems in the prior art and provides a battery liquid injection hole sealing structure, a battery cover plate and a battery.
The utility model provides a battery liquid injection hole sealing structure, which comprises an elastic sealing nail, wherein the elastic sealing nail is provided with a round table part, and the small end of the round table part is provided with a limiting part; the round platform part is connected with a conical through hole of the liquid injection counter bore on the battery cover plate in an interference fit mode, and the limiting part is used for being clamped at the bottom of the conical through hole and limiting and fixing the elastic sealing nail after the round platform part is completely pressed into the conical through hole.
According to a second aspect of the utility model, a battery cover plate is provided, which comprises the battery liquid injection hole sealing structure according to the first aspect of the utility model.
In a third aspect of the utility model, a battery is provided, comprising a battery cover plate according to the second aspect of the utility model.
The elastic sealing nail is provided with a round table part, and the small end of the round table part is provided with a limiting part; the round platform part is matched with the conical through hole of the liquid injection counter bore on the battery cover plate, the effect that the round platform part is completely pressed into the conical through hole can be achieved, the elastic sealing nail is clamped at the bottom of the conical through hole through the limiting part, and is limited and fixed, so that the elastic sealing nail is prevented from falling into a battery when the battery is sealed, the elastic sealing nail is prevented from being reversely extruded, the elastic sealing nail is effectively fixed in the liquid injection counter bore of the battery, the effect of effectively sealing the liquid injection hole of the battery can be achieved, and the airtight performance after sealing meets the sealing requirement.
Drawings
Fig. 1 is a schematic perspective view of a battery sealing structure according to an embodiment of the utility model.
Fig. 2 is a schematic cross-sectional view of a battery seal structure according to an embodiment of the present utility model.
Fig. 3 is a schematic view of a battery seal assembly process according to an embodiment of the present utility model.
Reference numerals illustrate:
1-sealing nails, 11-external screw thread parts, 12-cross grooves, 2-elastic sealing nails, 21-round platform parts, 22-limit parts, 221-ventilation gaps, 3-battery cover plates, 31-liquid injection counter bores, 311-sinking platforms, 312-conical through holes and 313-sinking platform side walls.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1 and 2, in a first aspect of the embodiment of the present utility model, a battery liquid injection hole sealing structure is provided, which includes an elastic sealing nail 2, the elastic sealing nail 2 has a round table portion 21, and a small end of the round table portion 21 has a limit portion 22; the round table portion 21 is adapted to a conical through hole 312 of the liquid injection counter bore 31 formed in the battery cover plate 3, and is connected with the conical through hole 312 in an interference fit manner, and the limiting portion 22 is used for limiting and fixing the elastic sealing nail 2 after the round table portion 21 is completely pressed into the conical through hole 312 and clamped at the bottom of the conical through hole 312.
Under the above embodiment, the inclined surface of the side surface of the round table portion 21 of the elastic sealing nail 2 and the limiting portion 22 are utilized to effectively ensure that the elastic sealing nail 2 is inserted into the conical through hole 312 of the liquid injection counter bore 31 and then is fixed in position, so that the elastic sealing nail can not fall into a battery or be extruded out of the conical through hole 312 of the liquid injection counter bore 31. The conical through hole 312 at the bottom of the liquid injection counter bore 31 adopts a conical hole, has a certain inclination angle, can play a guiding role for the insertion of the elastic sealing nail 2, and is matched with the matching of the limiting part 22 of the elastic sealing nail 2, so that the elastic sealing nail 2 can form self-locking, and meanwhile, the residual of electrolyte is effectively reduced.
The elastic sealing nail 2 is made of elastic material, has certain elasticity or compression amount, and at the same height position, the diameter of the round table 21 is different from the diameter of the conical through hole 312, in particular, the diameter of each height position of the round table 21 is designed to be larger than the diameter of the conical through hole 312 at the same height position, so as to ensure that the elastic sealing nail has certain compression amount after being completely pressed in, and the specific diameter is determined and designed based on the size of the conical through hole 312 and the elastic compression measure of the elastic material; by controlling the compression amount of the circular truncated cone portion of the elastic sealing nail 2, the air tightness of the battery can be ensured. When the round platform part 21 of the elastic sealing nail 2 is pressed into the conical through hole 312, the round platform part and the conical through hole 312 can form mutual extrusion so as to be compressed, thereby realizing an extrusion sealing structure with the hole wall of the conical through hole 312, and further improving the air tightness of the sealing structure of the liquid injection counter bore. In a preferred embodiment, the elastic sealing nail 2 is a plastic sealing nail, and the whole elastic sealing nail is formed into an integrally formed structure by rubber injection molding, and more preferably, the elastic sealing nail 2 is made of fluororubber material with acid resistance and high temperature resistance and a predetermined compression amount.
In the present utility model, the inclination angle of the outer wall inclined plane of the circular table 21 of the elastic sealing nail 2 matches the inclination angle of the inner wall inclined plane of the hole of the conical through hole 312, and may be set to be 5 ° -30 °, and may be any one degree value including 5 ° -30 °; the limiting part 22 at the small end of the elastic sealing nail 2 may be represented as a flange protruding outwards relative to the small end of the circular truncated cone part in the circumferential direction, and the design of the flange realizes limiting after the elastic sealing nail 2 is pressed into the conical through hole 312, and since the diameter of the conical through hole 312 at the same height position is smaller than that of the circular truncated cone 21 at the same position, a certain compression amount exists after the circular truncated cone 21 is pressed in, so that the conical through hole 312 has an oblique upward elastic force on the elastic sealing nail 2, and the elastic sealing nail 2 can reach a self-locking state in height relative to the battery cover plate 3 by matching with the limiting part 22.
In some embodiments, the limiting portion 22 may be a circular flange with an outer diameter larger than that of the small end of the circular table 21, a flange formed by a special-shaped piece, or a flange formed by a triangular piece structure, etc., which is not limited to the shape of the embodiment in the drawings, so long as the limiting portion can be clamped at the bottom of the conical through hole, and can prevent the elastic sealing nail from being extruded reversely.
In some embodiments, at least one ventilation notch 221 is formed on the outer wall surface of the limiting portion 22, and the ventilation notch 221 is provided, so that the circular truncated cone portion 21 is matched with the inner wall of the conical through hole 312 when not fully inserted into the conical through hole 312, so that an air flow channel is formed between the inside and the outside of the battery, helium gas can be conveniently injected into the battery or negative pressure sealing is conveniently completed, that is, when the limiting portion 22 contacts with the conical through hole 312 of the liquid injection counter bore 31, a gap can exist between the limiting portion and the conical through hole 312, so as to ensure that an air channel exists after pre-pressing nails. Preferably, the ventilation notch 221 is disposed on a side surface of the limiting portion 22, and may be a groove structure of a through groove type passing from bottom to top on the side surface thereof.
In some embodiments, the battery liquid injection hole sealing structure further includes a sealing nail 1, the sealing nail 1 is a plate body with an external threaded portion 11 on an outer wall surface, after the elastic sealing nail 2 is pressed into the taper-shaped through hole 312 and is limited and fixed, the sealing nail 1 is in threaded connection with an internal thread (not shown) of a sinking table 311 of the liquid injection counter bore 31 through the external threaded portion 11, and is pressed on the top end of the elastic sealing nail 2, the bearing of the sealing nail 1 can be realized through the sinking table 311, and the internal thread of the sinking table 311 forms a sinking table side wall 313. By providing the sealing nail 1 above the elastic sealing nail 2, the position of the elastic sealing nail 2 can be further limited. The sealing nail 1 is fastened by adopting a locking mode of the external thread part 11, and the elastic sealing nail 2 is pressed downwards, so that the sealing effect can be more effectively ensured; preferably, the sealing nail 1 is a metal nail, such as an aluminum material or an aluminum alloy material, or other materials.
In some embodiments, the sealing pin 1 is in a truncated cone shape, and the counter side wall 313 of the counter 311, which forms the internal thread, surrounds a counter side wall structure forming a conical surface/truncated cone surface that is matched with the sealing pin. The design that the sinking platform side wall 313 of the sinking platform 311 is inclined to form a conical surface/a conical platform surface can effectively reduce the residue of electrolyte.
In some preferred embodiments, the inclination of the outer wall surface of the sealing pin 1 is smaller than the inclination of the outer wall surface of the truncated cone 21, that is, the inclination of the hole wall/inner side surface of the tapered through hole 312 is larger than the inclination of the side wall surface of the tapered surface of the countersink. Preferably, the inclination angle of the sidewall of the sinking platform 311 may be selected in a range of greater than 0 and less than or equal to 45 °.
In order to facilitate the rotation operation of the sealing pin 1, a groove, such as a straight groove or a cross groove 12, or other shaped groove, is formed on the top surface of the sealing pin 1 to facilitate the operation using a tool, which is not limited to the embodiment shown in the drawings.
In the utility model, negative pressure sealing, normal pressure sealing or positive pressure sealing can be finished by adjusting the air pressure of the elastic sealing nail 2 after negative pressure pumping and supplementing helium gas.
Referring to fig. 3, when the liquid injection counter bore of the battery is sealed, the steps are as follows:
after the battery is filled with liquid, the elastic sealing nail 2 is pre-pressed, the downward pressing stroke of the elastic sealing nail 2 is controlled, the elastic sealing nail 2 is partially pressed into the conical through hole 312 of the liquid filling counter bore 31, the ventilation notch 221 is prevented from being blocked, a certain helium gas is supplemented after the negative pressure is pumped to the battery in the state, then the downward pressing stroke of the elastic sealing nail 2 is controlled, the elastic sealing nail 2 is completely inserted into the conical through hole 312 of the liquid filling counter bore 31, and sealing is completed. After the elastic sealing nail 2 is pressed in, the sealing nail 1 is screwed into the sinking platform 311 through the cross groove 12, the sealing nail 1 and the side wall of the sinking platform 311 are connected in a threaded manner through the external thread part 11, and the sealing nail 1 can be stopped through torsion or travel.
The sealing structure of the battery liquid injection hole provided by the utility model can be used for batteries with various types including square, cylindrical and the like.
The sealing structure of the battery liquid injection hole can ensure that the air tightness of the position of the battery core liquid injection counter bore is kept in a preset state, and effectively avoids electrolyte leakage, so that the quality of the battery and the safety performance of the battery are improved, the occurrence probability of poor air tightness and leakage of the battery can be effectively reduced, the quality of the battery is improved, the process yield is improved, the manufacturing cost is saved, and meanwhile, the steps of laser welding and laser cleaning are omitted, the equipment investment of a laser welding machine and a cleaning machine is reduced, the equipment cost is saved, the rejection of sealing nails generated in the manufacturing process is avoided, and the equipment and the manufacturing cost are reduced.
In a second aspect of the embodiment of the present utility model, a battery cover plate is further provided, where the battery cover plate includes the sealing structure of the liquid injection hole of the battery according to the first aspect of the embodiment of the present utility model.
The technical content of the battery liquid injection hole sealing structure on the battery cover plate is referred to the description of the battery liquid injection hole sealing structure of the embodiment of the first aspect, and is not repeated herein. The battery cover plate can ensure that the air tightness of the battery core liquid injection counter bore position of the assembled battery is kept in a preset state through the applied technology of the battery liquid injection hole sealing structure, and the electrolyte leakage of the battery is effectively avoided, so that the quality of the battery and the safety performance of the battery are improved.
In a third aspect of the embodiment of the present utility model, a battery is further provided, where the battery includes a battery cover plate according to the second aspect of the embodiment of the present utility model. After the battery cover plate is adopted by the battery, the air tightness of the battery core liquid injection counter bore position of the battery can be ensured to be kept in a preset state by the technology of the battery liquid injection hole sealing structure applied to the battery cover plate, and the leakage of electrolyte of the battery is effectively avoided, so that the quality of the battery and the safety performance of the battery are improved.
The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.
Claims (10)
1. The battery liquid injection hole sealing structure is characterized by comprising an elastic sealing nail, wherein the elastic sealing nail is provided with a round table part, and the small end of the round table part is provided with a limiting part; the round platform part is connected with a conical through hole of the liquid injection counter bore on the battery cover plate in an interference fit mode, and the limiting part is used for being clamped at the bottom of the conical through hole and limiting and fixing the elastic sealing nail after the round platform part is completely pressed into the conical through hole.
2. The battery liquid injection hole sealing structure according to claim 1, wherein the inclined angle of the outer wall inclined surface of the round table of the elastic sealing nail is 5-30 °.
3. The battery liquid injection hole sealing structure according to claim 1, wherein the outer wall surface of the limiting part is provided with at least one ventilation notch, and the ventilation notch is used for being matched with the inner wall of the conical through hole when the round table part is not fully inserted into the conical through hole, so that an air flow channel is formed between the inside and the outside of the battery.
4. The battery pour hole sealing construction according to claim 1, wherein the elastic sealing nail is a plastic sealing nail formed of a plastic material having a predetermined compression amount.
5. The battery liquid injection hole sealing structure according to claim 1, comprising a sealing nail, wherein the sealing nail is a plate body with an external thread part on the outer wall surface, and the sealing nail is tightly pressed at the top end of the elastic sealing nail after being pressed into the conical through hole for limiting and fixing and is in threaded connection with an internal thread on the side wall of a sinking table of the liquid injection counter bore through the external thread part.
6. The battery liquid injection hole sealing structure according to claim 5, wherein the sealing nail is in a truncated cone shape, and the sealing nail in the truncated cone shape is matched with the side wall of the cone-shaped sinking platform of the sinking platform.
7. The battery liquid injection hole sealing structure according to claim 6, wherein the inclination angle of the conical sinking platform side wall of the sinking platform is more than 0 and less than or equal to 45 degrees.
8. The battery pour hole sealing construction according to claim 5, wherein the sealing nail is a metal sealing nail, and a groove for facilitating the operation thereof by a tool is formed on the top surface thereof.
9. A battery cover plate, characterized by comprising the battery liquid injection hole sealing structure according to any one of claims 1 to 8.
10. A battery comprising the battery cover of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321679287.6U CN219917545U (en) | 2023-06-29 | 2023-06-29 | Battery liquid injection hole sealing structure, battery cover plate and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321679287.6U CN219917545U (en) | 2023-06-29 | 2023-06-29 | Battery liquid injection hole sealing structure, battery cover plate and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219917545U true CN219917545U (en) | 2023-10-27 |
Family
ID=88423004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321679287.6U Active CN219917545U (en) | 2023-06-29 | 2023-06-29 | Battery liquid injection hole sealing structure, battery cover plate and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219917545U (en) |
-
2023
- 2023-06-29 CN CN202321679287.6U patent/CN219917545U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11114716B1 (en) | Secondary battery, battery pack and device using battery | |
| CN210576046U (en) | Sealing element for lithium ion battery capacitor | |
| CN101409332B (en) | Sealed battery | |
| CN112467316B (en) | Annotate liquid hole seal structure and power battery top cap | |
| CN211428266U (en) | Sealing rubber nail for sealing liquid and air leakage of square lithium battery | |
| CN219163667U (en) | Annotate liquid hole explosion-proof structure, electric core apron, electric core casing and secondary cell | |
| CN219917545U (en) | Battery liquid injection hole sealing structure, battery cover plate and battery | |
| CN217062456U (en) | Welding-free sealing nail and square aluminum shell battery | |
| CN115411470A (en) | Battery filling opening sealing structure, sealing assembly and battery monomer | |
| CN218334252U (en) | Power lithium ion battery annotates liquid hole seal structure | |
| CN213752837U (en) | Cover plate assembly for battery cell and battery cell | |
| CN216354475U (en) | Annotate liquid mouth seal assembly and include its secondary battery | |
| CN208315622U (en) | A kind of start stop system AGM battery exhaust structure | |
| CN220774545U (en) | Battery cell top cover structure and battery cell | |
| CN219843131U (en) | Battery filling hole sealing nail and battery | |
| CN112909391A (en) | Lithium battery | |
| CN210014007U (en) | End face sealing element structure of valve | |
| CN218351698U (en) | Battery filling opening sealing structure, sealing assembly and battery monomer | |
| CN220856720U (en) | Cover plate assembly and battery | |
| CN220341354U (en) | Cover plate assembly and power battery with same | |
| CN220895812U (en) | Sealing nail and sealing structure of rechargeable battery and rechargeable battery | |
| CN220456582U (en) | Battery top cap, battery monomer and battery package | |
| CN220358266U (en) | Explosion-proof cover plate of battery and battery | |
| CN220604802U (en) | Battery case and battery product thereof | |
| CN218625617U (en) | Valve under-pressure plugging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |