CN215896572U - Self-protection lead-acid battery - Google Patents
Self-protection lead-acid battery Download PDFInfo
- Publication number
- CN215896572U CN215896572U CN202120287483.3U CN202120287483U CN215896572U CN 215896572 U CN215896572 U CN 215896572U CN 202120287483 U CN202120287483 U CN 202120287483U CN 215896572 U CN215896572 U CN 215896572U
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- Prior art keywords
- sliding
- rod
- lead
- acid battery
- groove
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- 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.)
- Expired - Fee Related
Links
- 239000002253 acid Substances 0.000 title claims abstract description 68
- 238000004321 preservation Methods 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000243 solution Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical group O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Mounting, Suspending (AREA)
Abstract
The utility model discloses a self-protection lead-acid battery, which comprises a lead-acid battery and a protection box arranged outside the lead-acid battery, wherein the bottom of the lead-acid battery is fixedly connected with a base, the base is connected with the inner wall of the protection box in a sliding manner, the bottom wall of the protection box is provided with a first groove, the inner wall of the first groove is fixedly connected with a first sliding rod and a second sliding rod, the surfaces of the first sliding rod and the second sliding rod are sleeved with a same first sliding block in a sliding manner, a supporting rod is hinged between the top of the first sliding block and the bottom of the base, a section of the surface of the first sliding rod, which is positioned between the first sliding block and the inner wall of the first groove, is sleeved with a first spring, and both sides of the inner wall of the protection box are provided with third sliding rods. According to the utility model, through the arrangement of the protection box, the lead-acid battery is favorably prevented from being impacted by the outside, the sulfuric acid is prevented from leaking, and through the arrangement of the second sliding block and the clamping strip, the two ends of the lead-acid battery are fixed with the inner wall of the protection box, so that the lead-acid battery is prevented from colliding with the inner wall of the protection box.
Description
Technical Field
The utility model belongs to the technical field of lead-acid batteries, and particularly relates to a self-protection lead-acid battery.
Background
A lead-acid battery is a storage battery with electrodes mainly made of lead and its oxides and electrolyte solution of sulfuric acid solution. In the discharge state of the lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in a charged state, the main components of the positive electrode and the negative electrode are lead sulfate. In the theoretical research aspect, the lead-acid storage battery has made great progress in the aspects of product types, product varieties, product electrical performance and the like, and the lead-acid storage battery plays an indispensable important role in all economic fields of traffic, communication, electric power, military, navigation and aviation.
Since the electrolyte in the lead-acid battery has corrosivity of sulfuric acid solution, when the lead-acid battery is impacted by external force, the sulfuric acid flows out after the lead-acid shell is damaged to cause damage to the surrounding environment, and the self-protection lead-acid battery is needed to prevent the internal part from being impacted.
Therefore, it is necessary to invent a self-protection lead-acid battery to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention provides a self-protected lead-acid battery to solve the problems mentioned in the background art.
In order to achieve the purpose, the utility model provides the following technical scheme: a self-protection lead-acid battery comprises a lead-acid battery and a protection box arranged outside the lead-acid battery, wherein the bottom of the lead-acid battery is fixedly connected with a base, the base is connected with the inner wall of the protection box in a sliding manner, a first groove is formed in the bottom wall of the protection box, a first sliding rod and a second sliding rod are fixedly connected with the inner wall of the first groove, the surfaces of the first sliding rod and the second sliding rod are sleeved with a same first sliding block in a sliding manner, a supporting rod is hinged between the top of the first sliding block and the bottom of the base, the first sliding rod is positioned on one side surface of the first sliding block and sleeved with a first spring, third sliding rods are arranged on two sides of the inner wall of the protection box, the surface of each third sliding rod is sleeved with a second sliding block, one end of each second sliding block is movably inserted and connected with a fixed block, the fixed block is fixedly connected with the top of the lead-acid battery, a second groove is formed in the top of one end of each second sliding block, and a clamping block is movably inserted and connected in the second groove, one side of the fixture block is arranged in a slope shape, the top of the fixture block is movably inserted into the fixture block, the inner bottom wall of the second groove is fixedly connected with a limiting rod movably inserted into the fixture block, and a section of surface of the limiting rod, which is positioned inside the second groove, is sleeved with a second spring;
fixing devices are arranged between the third sliding rod and the second sliding block and between the second sliding rod and the first sliding block, each fixing device comprises a rotating shaft, an inclined rod is fixedly connected with the rotating shaft, one end of the rotating shaft is rotatably connected with the second sliding rod and the third sliding rod, the other end of the rotating shaft is rotatably penetrated through the protection box and extends to the outside, a third groove is formed in the surface of the second sliding rod and the surface of the third sliding rod, a clamping strip is movably inserted in the third groove, a clamping groove matched with the clamping strip is formed in the second sliding block and the third sliding block, a pull rod is fixedly connected to one side of the clamping strip, a third spring is sleeved on one section of surface of the pull rod in the third groove, one end of the pull rod is movably inserted in the inner wall of the third groove, a fixing rod is fixedly connected with the top of the second sliding rod, and the inclined rod are slidably connected.
Preferably, the lead-acid battery is internally provided with a positive electrode and a negative electrode, and is electrically connected with an electrical element outside the protection box.
Preferably, one side of the clamping strip is fixedly connected with a limiting strip, the limiting strip is movably inserted into the inner bottom wall of the third groove, and the surface of the limiting strip is located at one section of the surface inside the third groove and is sleeved with a fourth spring.
Preferably, the height of the limiting rod is smaller than the depth of the second groove, and the height of the clamping block is smaller than the depth of the second groove.
Preferably, the base is horizontally arranged, and two ends of the base are connected with the inner wall of the protection box in a sliding mode.
Preferably, when the fixing rod slides to be close to the rotating shaft in the sliding groove, the clamping strip enters the third groove.
The utility model has the technical effects and advantages that:
1. according to the utility model, through the arrangement of the protection box, the lead-acid battery is favorably prevented from being impacted by the outside, the sulfuric acid is prevented from leaking, when the lead-acid battery is placed in the protection box, the support rod pushes the first slide block to move towards two sides under the action of gravity, the shock absorption is carried out under the action of the first spring, the bottom of the lead-acid battery is prevented from colliding with the inner bottom wall of the protection box, the second slide block is rotated, one end of the second slide block is inserted into the fixed block, meanwhile, the second spring pushes the fixture block to be inserted into the top of the fixed block, and through the arrangement of the second slide block, the two ends of the lead-acid battery are fixed with the inner wall of the protection box, so that the lead-acid battery is favorably prevented from shaking left and right, and the lead-acid battery is prevented from colliding with the inner wall of the protection box;
2. according to the utility model, through the arrangement of the clamping strips, the rotating shaft is rotated clockwise, the pull rod is pulled under the action of the inclined rod, the clamping strips are separated from the clamping grooves and enter the third groove, the height of the second sliding block is adjusted, the distance from the first sliding block to the inner wall of the first groove is adjusted, the rotating shaft is put down, the clamping strips are pushed to enter the clamping grooves under the action of the third spring, the second sliding block and the third sliding rod are fixed, and meanwhile, the first sliding block and the second sliding rod are fixed, so that the lead-acid battery can be prevented from shaking up and down, and the lead-acid battery can be prevented from colliding with the top of the protection box.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1 according to the present invention;
FIG. 3 is an enlarged view of portion B of FIG. 2 according to the present invention;
FIG. 4 is a top cross-sectional view of the present invention;
FIG. 5 is an enlarged view of the portion C of FIG. 4 according to the present invention.
In the figure: 1. a lead-acid battery; 2. a protection box; 3. a base; 4. a first groove; 5. a first slide bar; 6. A second slide bar; 7. a first slider; 8. a support bar; 9. a first spring; 10. a third slide bar; 11. a second slider; 12. a fixed block; 13. a second groove; 14. a clamping block; 15. a limiting rod; 16. a second spring; 17. a rotating shaft; 18. a diagonal bar; 19. a third groove; 20. clamping the strip; 21. a card slot; 22. a pull rod; 23. a third spring; 24. and (5) fixing the rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a self-protection lead-acid battery as shown in figures 1-5, which comprises a lead-acid battery 1 and a protection box 2 arranged outside the lead-acid battery 1, wherein the bottom of the lead-acid battery 1 is fixedly connected with a base 3, the base 3 is in sliding connection with the inner wall of the protection box 2, the inner wall of the protection box 2 is provided with a first groove 4, the inner wall of the first groove 4 is fixedly connected with a first slide bar 5 and a second slide bar 6, the surfaces of the first slide bar 5 and the second slide bar 6 are in sliding sleeve joint with a same first slide block 7, a support bar 8 is hinged between the top of the first slide block 7 and the bottom of the base 3, the surface of the first slide bar 5 positioned at one side of the first slide block 7 is in sleeve joint with a first spring 9, the two sides of the inner wall of the protection box 2 are both provided with third slide bars 10, the surface of the third slide bar 10 is in sleeve joint with a second slide block 11, one end of the second slide block 11 is movably inserted with a fixed block 12, the fixed block 12 is fixedly connected with the top of the lead-acid battery 1, a second groove 13 is formed in the top of one end of the second sliding block 11, a clamping block 14 is movably inserted in the second groove 13, one side of the clamping block 14 is in a slope type arrangement, the top of the clamping block is movably inserted in the fixed block 12, a limiting rod 15 movably inserted in the clamping block 14 is fixedly connected to the inner bottom wall of the second groove 13, a second spring 16 is sleeved on one section of surface, located in the second groove 13, of the limiting rod 15, a protection box 2 is arranged, so that the lead-acid battery 1 is prevented from being impacted by the outside, sulfuric acid leakage is prevented, when the lead-acid battery 1 is placed in the protection box 2, the supporting rod 8 pushes the first sliding block 7 to move towards two sides under the action of gravity, shock absorption is performed under the action of the first spring 9, the bottom of the lead-acid battery 1 is prevented from colliding with the inner bottom wall of the protection box 2, and the second sliding block 11 is rotated, one end of a second sliding block 11 is inserted into the fixed block 12, meanwhile, a second spring 16 pushes the clamping block 14 to be inserted into the top of the fixed block 12, and through the arrangement of the second sliding block 11, two ends of the lead-acid battery 1 are fixed to the inner wall of the protection box 2, so that the lead-acid battery 1 is prevented from shaking left and right, and meanwhile, the lead-acid battery 1 is prevented from colliding with the inner wall of the protection box 2;
fixing devices are arranged between the third slide bar 10 and the second slide block 11 and between the second slide bar 6 and the first slide block 7, each fixing device comprises a rotating shaft 17, an inclined rod 18 is fixedly connected with the rotating shaft 17, one end of the rotating shaft 17 is rotatably connected with the second slide bar 6 and the third slide bar 10, the other end of the rotating shaft 17 rotatably penetrates through the protection box 2 and extends to the outside, third grooves 19 are formed in the surfaces of the second slide bar 6 and the third slide bar 10, clamping strips 20 are movably inserted in the third grooves 19, clamping grooves 21 matched with the clamping strips 20 are formed in the second slide block 11 and the third slide block, a pull rod 22 is fixedly connected to one side of each clamping strip 20, a third spring 23 is sleeved on a section of surface of the pull rod 22, which is located in the third grooves 19, one end of the pull rod 22 is movably inserted in the inner wall of the third grooves 19, and a fixing rod 24 is fixedly connected to the top of the pull rod 22, dead lever 24 and the inside sliding connection of down tube 18, setting through card strip 20, clockwise rotation axis of rotation 17, make pulling pull rod 22 under the effect of down tube 18, make card strip 20 break away from draw-in groove 21 and get into third recess 19, adjust the height of second slider 11 and adjust the distance of first slider 7 to first recess 4 inner wall, put down axis of rotation 17, promote card strip 20 and get into draw-in groove 21 under the effect of third spring 23, it is fixed with second slider 11 and third slide bar 10, fix first slider 7 and second slide bar 6 simultaneously, be favorable to preventing that lead-acid battery 1 from rocking from top to bottom, prevent to collide with guard box 2 top.
As a specific embodiment of the present invention, the lead-acid battery 1 is internally provided with a positive electrode and a negative electrode, and is electrically connected to the outside of the protection box 2, which is beneficial for the lead-acid battery 1 to be electrically connected to external electrical components.
As a specific embodiment of the present invention, one side of the clip strip 20 is fixedly connected with a limiting strip, the limiting strip is movably inserted into the bottom wall of the third groove 19, and a section of surface of the surface inside the third groove 19 is sleeved with a fourth spring, which is beneficial to preventing the clip strip 20 from rotating.
As a specific embodiment of the present invention, the height of the limiting rod 15 is less than the depth of the second groove 13, and the height of the locking block 14 is less than the depth of the second groove 13, which is beneficial to the movable insertion of the second sliding block 11 and the fixed block 12.
As a specific embodiment of the present invention, the base 3 is horizontally disposed, and both ends of the base are slidably connected to the inner wall of the protection box 2.
As an embodiment of the present invention, when the fixing rod 24 slides inside the sliding chute to be close to the rotating shaft 17, the clamping strip 20 enters the third groove 19, which facilitates the movement of the second sliding block 11 and the first sliding block 7.
The working principle of the utility model is as follows:
referring to the attached drawings 1-5 in the specification, through the arrangement of the protection box 2, the lead-acid battery 1 is favorably prevented from being impacted by the outside, and sulfuric acid leakage is prevented, when the lead-acid battery 1 is placed in the protection box 2, the support rod 8 pushes the first slide block 7 to move towards two sides under the action of gravity, shock absorption is carried out under the action of the first spring 9, the bottom of the lead-acid battery 1 is prevented from colliding with the inner bottom wall of the protection box 2, the second slide block 11 is rotated, one end of the second slide block 11 is inserted into the fixed block 12, meanwhile, the second spring 16 pushes the fixture block 14 to be inserted into the top of the fixed block 12, through the arrangement of the second slide block 11, two ends of the lead-acid battery 1 are fixed with the inner wall of the protection box 2, the lead-acid battery 1 is favorably prevented from shaking left and right, and meanwhile, the lead-acid battery 1 is prevented from colliding with the inner wall of the protection box 2;
clockwise rotation axis of rotation 17, make pulling pull rod 22 under the effect of down tube 18, make card strip 20 break away from draw-in groove 21 and get into third recess 19, adjust the height of second slider 11 and adjust the distance of first slider 7 to first recess 4 inner wall, put down axis of rotation 17, promote card strip 20 and get into draw-in groove 21 under the effect of third spring 23, it is fixed with third slider 11 and third slide bar 10, fix first slider 7 and second slide bar 6 simultaneously, be favorable to preventing that lead acid battery 1 from rocking from top to bottom, prevent to collide with protection box 2 top.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a self preservation protects lead acid battery, includes lead acid battery (1) and its outside guard box (2) that sets up, its characterized in that: the lead-acid battery protection device is characterized in that a base (3) is fixedly connected to the bottom of a lead-acid battery (1), the base (3) is connected with the inner wall of a protection box (2) in a sliding manner, a first groove (4) is formed in the inner wall of the protection box (2), a first sliding rod (5) and a second sliding rod (6) are fixedly connected to the inner wall of the first groove (4), the same first sliding block (7) is sleeved on the surfaces of the first sliding rod (5) and the second sliding rod (6) in a sliding manner, a supporting rod (8) is hinged between the top of the first sliding block (7) and the bottom of the base (3), a first spring (9) is sleeved on the surface of one side of the first sliding rod (5) located on the first sliding block (7), third sliding rods (10) are arranged on two sides of the inner wall of the protection box (2), a second sliding block (11) is sleeved on the surface of the third sliding rod (10), a fixed block (12) is movably inserted and connected to one end of the second sliding block (11), the fixed block (12) is fixedly connected with the top of the lead-acid battery (1), a second groove (13) is formed in the top of one end of the second sliding block (11), a clamping block (14) is movably inserted into the second groove (13), one side of the clamping block (14) is arranged in a slope shape, the top of the clamping block is movably inserted into the fixed block (12), a limiting rod (15) movably inserted into the clamping block (14) is fixedly connected to the inner bottom wall of the second groove (13), and a second spring (16) is sleeved on one section of surface of the limiting rod (15) located inside the second groove (13);
fixing devices are arranged between the third sliding rod (10) and the second sliding block (11) and between the second sliding rod (6) and the first sliding block (7), each fixing device comprises a rotating shaft (17), an inclined rod (18) is fixedly connected to the rotating shaft (17), one end of the rotating shaft (17) is rotatably connected with the second sliding rod (6) and the third sliding rod (10), the other end of the rotating shaft (17) rotatably penetrates through the protection box (2) and extends to the outside, third grooves (19) are formed in the surfaces of the second sliding rod (6) and the third sliding rod (10), clamping strips (20) are movably inserted into the third grooves (19), clamping grooves (21) matched with the clamping strips (20) are formed in the second sliding block (11) and the third sliding block, a pull rod (22) is fixedly connected to one side of the clamping strips (20), a third spring (23) is sleeved on one section of the surface of the pull rod (22) located in the third grooves (19), one end of the pull rod (22) is movably inserted into the inner wall of the third groove (19), a fixing rod (24) is fixedly connected to the top of the pull rod, and the fixing rod (24) is connected with the inner portion of the inclined rod (18) in a sliding mode.
2. A self-protected lead-acid battery according to claim 1, wherein: the lead-acid battery (1) is internally provided with a positive electrode and a negative electrode and is electrically connected with an electrical element outside the protection box (2).
3. A self-protected lead-acid battery according to claim 1, wherein: the limiting strip is fixedly connected to one side of the clamping strip (20), the limiting strip is movably inserted into the inner bottom wall of the third groove (19), and a fourth spring is sleeved on one section of the surface, located inside the third groove (19), of the surface.
4. A self-protected lead-acid battery according to claim 1, wherein: the height of the limiting rod (15) is smaller than the depth of the second groove (13), and the height of the clamping block (14) is smaller than the depth of the second groove (13).
5. A self-protected lead-acid battery according to claim 1, wherein: the base (3) is horizontally arranged, and two ends of the base are connected with the inner wall of the protection box (2) in a sliding mode.
6. The self-protected lead-acid battery of claim 5, wherein: when the fixing rod (24) slides to be close to the rotating shaft (17) in the sliding groove, the clamping strip (20) enters the third groove (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120287483.3U CN215896572U (en) | 2021-02-01 | 2021-02-01 | Self-protection lead-acid battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120287483.3U CN215896572U (en) | 2021-02-01 | 2021-02-01 | Self-protection lead-acid battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215896572U true CN215896572U (en) | 2022-02-22 |
Family
ID=80339693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120287483.3U Expired - Fee Related CN215896572U (en) | 2021-02-01 | 2021-02-01 | Self-protection lead-acid battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215896572U (en) |
-
2021
- 2021-02-01 CN CN202120287483.3U patent/CN215896572U/en not_active Expired - Fee Related
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Address after: 230000 third floor of sodi electromechanical plant, No. 13, Shinan Road, Baiyan Science Park, high tech Zone, Hefei, Anhui Province Patentee after: Hefei Deheng Photoelectric Technology Co.,Ltd. Address before: 230000 third floor of sodi electromechanical plant, No. 13, Shinan Road, Baiyan Science Park, high tech Zone, Hefei, Anhui Province Patentee before: HEFEI DEHENG OPTOELECTRONICS TECHNOLOGY CO.,LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220222 |
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| CF01 | Termination of patent right due to non-payment of annual fee |