CN202309497U - AC-DC integrated 48V lithium iron phosphate battery communication power supply system - Google Patents
AC-DC integrated 48V lithium iron phosphate battery communication power supply system Download PDFInfo
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- CN202309497U CN202309497U CN2011204451632U CN201120445163U CN202309497U CN 202309497 U CN202309497 U CN 202309497U CN 2011204451632 U CN2011204451632 U CN 2011204451632U CN 201120445163 U CN201120445163 U CN 201120445163U CN 202309497 U CN202309497 U CN 202309497U
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Abstract
An AC-DC (Alternating Current-Direct Current) integrated 48V lithium iron phosphate battery communication power supply system comprises: a 48V lithium iron phosphate battery pack module contained in a cabinet, wherein the 48V lithium iron phosphate battery pack module provides a 48V DC output during a mains supply failure; an inverter module connected with the battery pack module, wherein the inverter module converts the 48V DC into a 220V AC to output during the mains supply failure; and a switching power supply module, wherein the switching power supply module comprises a modularization BMS (Battery Management System) used for managing charge and discharge of the battery pack module, and a rectification module connected with the battery pack module, in order to provide a constant current output by rectifying a mains supply input when the mains supply is normal, and to charge the battery pack module when battery pack capacity of the battery pack module declines. Therefore, the utility model provides a reserve type lithium iron phosphate battery communication power supply system capable of satisfying energy saving and emission reduction requirements such as energy saving, material saving, land saving and so on.
Description
Technical field
The utility model relates to a kind of power-supply system, particularly relates to the integrated 48V ferric phosphate lithium cell of a kind of alternating current-direct current power supply system for communications.
Background technology
At present, in the communications industry a large amount of valve controlled sealed lead-acid accumulators that use, through construction and the operation maintenance of several years, have the following problems that becomes increasingly conspicuous.
1, energy to weight ratio, energy volume ratio are all lower, and battery weight is heavy, and floor space is big, have relatively high expectations for floor load-bearing and machine room area, bring very big difficulty to machine room, base station selection.
2, operating ambient temperature requires high; Valve controlled sealed lead-acid accumulator can operate as normal temperature range narrow; To abominable outdoor integrated base stations such as some repeaters, because range of temperature is big, reduce the useful life of analysing valve control type lead-acid accumulator battery greatly for environment facies.
3, efficiency for charge-discharge is low, and along with the increase that discharges and recharges the frequency, efficiency for charge-discharge can progressively descend.
4, life-span weak point, average life span is 3-5.
5, a large amount of uses are plumbous in the lead acid accumulator, and lead is heavy metal, all will work the mischief to human body and environment, and the lead-acid battery environmental pollution is bigger for this reason.
Ferric phosphate lithium cell is that a kind of positive electrode is LiFePO 4 (LiFePO
4) novel storage battery.Ferric phosphate lithium cell owing to have has extended cycle life, high temperature resistant, volume is little, advantage such as in light weight, pollution-free, therefore in industry extensive application prospects such as mobile communication, electric automobile, national grids.
Based on the problems referred to above, seek new back-up source, for example to substitute lead acid accumulator be imperative to ferric phosphate lithium cell.
The utility model content
For avoiding the deficiency of above prior art; The utility model provides the integrated 48V ferric phosphate lithium cell of a kind of alternating current-direct current power supply system for communications, thereby the communication of energy-conservation reduction of discharging requirement such as providing a kind of can satisfy energy-conservation, material-saving, save land is with the supporting power-supply system of backup type ferric phosphate lithium cell.
According to the utility model; The integrated 48V ferric phosphate lithium cell of a kind of alternating current-direct current power supply system for communications is provided; The integrated 48V ferric phosphate lithium cell of this alternating current-direct current power supply system for communications can comprise the 48V ferric phosphate lithium cell pack module that is contained in the cabinet, and it provides the output of 48V direct current when civil power cuts off the power supply; Inverter module, it is connected with 48V ferric phosphate lithium cell pack module, when civil power cuts off the power supply, converts the 48V direct current into 220V and exchanges output; And switch power module.This switch power module can comprise: modular battery management system, and it is used for the charging and the discharge of 48V ferric phosphate lithium cell pack module are managed; And rectification module; It is connected with said 48V ferric phosphate lithium cell pack module; With at civil power just often through the civil power input rectifying being provided constant current output, and when the battery capacity of 48V ferric phosphate lithium cell pack module descends to this 48V ferric phosphate lithium cell pack module charging.
In a preferred embodiment; This switch power module can also comprise the charge and discharge monitoring module; It is connected with 48V ferric phosphate lithium cell pack module; In order to monitoring the parameter of said 48V ferric phosphate lithium cell pack module in charging and discharge process, and this charge and discharge monitoring module is connected with this modular battery management system, to said modular battery management system Monitoring Data to be provided.
In a preferred embodiment, this switch power module can also comprise a second control module, and it is used to protect this 48V ferric phosphate lithium cell pack module.
In a preferred embodiment, this rectification module can provide the constant current output of 50A.
In a preferred embodiment, this switch power module can comprise 5 these rectification modules.
In a preferred embodiment, the integrated 48V ferric phosphate lithium cell of this alternating current-direct current power supply system for communications can also comprise the base that is used to carry 48V ferric phosphate lithium cell pack module, and this base below is provided with pulley.
In a preferred embodiment, the height of this base and this pulley can be 30-70mm, for example can be 30mm or 50mm.
In a preferred embodiment, this 48V ferric phosphate lithium cell pack module, switch power module and inverter module from top to bottom sequence stack in this cabinet.
In a preferred embodiment, the clearance between the inboard of this 48V ferric phosphate lithium cell pack module, switch power module and inverter module and this cabinet can be 10-50mm, for example can be 30mm.
In a preferred embodiment, this 48V ferric phosphate lithium cell pack module, switch power module and the clearance of inverter module on stacking direction can be 10-50mm, for example can be 30mm.
In a preferred embodiment, the length of this 48V ferric phosphate lithium cell pack module, switch power module and inverter module can be 482.6mm.
In a preferred embodiment, the width of this 48V ferric phosphate lithium cell pack module, switch power module and inverter module can be 354-654mm, for example can be 504mm.
In a preferred embodiment, the height of this 48V ferric phosphate lithium cell pack module, switch power module and inverter module can be 200-400mm, 445mm and 88mm respectively.Preferably, the height of this 48V ferric phosphate lithium cell pack module can be 276mm.
In a preferred embodiment, this 48V ferric phosphate lithium cell pack module can comprise the monomer ferric phosphate lithium cell of 16 3.2V.
With respect to prior art, the utility model has overcome the defective that lead acid accumulator exists in communication system applications, possesses excellent, outstanding features such as volume is little, in light weight, energy-conserving and environment-protective of high life, wide temperature range, high rate during charging-discharging.Particularly, in communication system applications, the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications can possess following advantage.
1. energy density is high: nominal voltage is 3.2V, and energy density is about 4 times of lead-acid battery, and volume and weight is equivalent to reduce the floor space of storage battery with about 1/3 of capacity valve control lead-acid battery, the load-bearing problem of floor.
2. high safety: lithium iron phosphate positive material has good electrochemical, charge and discharge platform very steadily, Stability Analysis of Structures in the charge and discharge process, battery does not burn, does not explode, fail safe is good.
3. temperature range is wide: can be in the environment of-20 ℃ ~+70 ℃ of external temperatures operate as normal, high temperature is very little to the influence in its life-span, can reduce air-conditioning power consumption, energy-conservation and solve numerous and diverse problems such as reserve battery of outdoor power supply.
4. high power output: but the standard discharge discharges and recharges for 0.2C 3C.
5. long circulation life: normal temperature 1C discharges and recharges; Monomer through 2000 times the circulation after capacity still greater than 80%; About 2000 times of charge and discharge cycles number of times (analysing valve control type lead-acid accumulator battery that is equivalent to use at present 500 times 4 times) has reduced the human cost that produces by changing storage battery.
6. environmental protection: whole process of production cleaning is nontoxic, and all raw materials are all nontoxic, and old and useless battery can reclaim fully, environmentally safe, help to promote whole common carrier the efficiency level, reduce the total cost of ownership (TCO) etc.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Fig. 1 illustrates the structural representation according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications; And
Fig. 2 A, 2B, 2C illustrate respectively according to the size sketch map of the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications along length, width and short transverse.
Embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
Shown in Figure 1 is the structural representation of the integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications 100 of the utility model.As shown in Figure 1; The integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications 100 can comprise the 48V ferric phosphate lithium cell pack module 120 that is contained in the cabinet 110, and this 48V ferric phosphate lithium cell pack module 120 can provide the output of 48V direct current when civil power cuts off the power supply.The integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications 100 can also comprise inverter module 140, and it is connected with 48V ferric phosphate lithium cell pack module 120, when civil power cuts off the power supply, converts the 48V direct current into 220V and exchanges output.The integrated 48V ferric phosphate lithium cell of this alternating current-direct current power supply system for communications 100 can also comprise switch power module 130.Preferably, this switch power module 130 can comprise modular battery management system (BMS) 132, and it is used for the charging and the discharge of 48V ferric phosphate lithium cell pack module 120 are managed.Preferably; This switch power module 130 can also comprise rectification module 138; It is connected with said 48V ferric phosphate lithium cell pack module 120; With at civil power just often through the civil power input rectifying being provided constant current output, and when the battery capacity of 48V ferric phosphate lithium cell pack module 120 descends to these 48V ferric phosphate lithium cell pack module 120 chargings.
For example, modular battery management system 132 possesses whole 48V ferric phosphate lithium cell pack module 120 is carried out intelligent batch (-type) management of charging and discharging function.Through the mode of instance, intelligent batch (-type) discharges and recharges step can comprise that constant current-constant voltage charge process T1,48V ferric phosphate lithium cell pack module 120 open circuits leave standstill process T2, batch (-type) replenishes electric process T3 and 48V ferric phosphate lithium cell pack module 120 discharge process T4.
At constant current-constant voltage charge process T1, modular battery management system 132 control of can charging according to the voltage of each cell, the charging voltage of control battery cell and battery pack satisfies the deboost requirement of charging, and all is full of up to all batteries.
For example, after 48V ferric phosphate lithium cell pack module 120 was accomplished whole constant current-constant voltage charge process T1,48V ferric phosphate lithium cell pack module 120 can get into open circuit static condition T2 by modular battery management system 132 controls.In battery pack open circuit static condition T2; When 48V ferric phosphate lithium cell pack module 120 capacity reduce to the 75%～95%SOC (battery capacity) of batteries charging deboost initial capacity; Again get into additional electricity condition T3 by modular battery management system 132 control 48V ferric phosphate lithium cell pack modules 120, replenish electric mode and also follow constant current-constant voltage charging method.Preferably, when 48V ferric phosphate lithium cell pack module 120 open circuit static conditions, if ac outage, modular battery management system 132 can be controlled 48V ferric phosphate lithium cell pack module 120 does not have the entering of delay discharge condition.
In the preferred embodiment of the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications 100, switch power module 130 can also comprise charge and discharge monitoring module 136.This charge and discharge monitoring module 136 can be connected with 48V ferric phosphate lithium cell pack module 120, in order to the parameter of monitoring 48V ferric phosphate lithium cell pack module 120 in charging and discharge process.In addition, this charge and discharge monitoring module 136 can be connected with this modular battery management system 132, to said modular battery management system 132 Monitoring Data to be provided.
Preferably, this switch power module 130 can also comprise a second control module 134 that is used to protect 48V ferric phosphate lithium cell pack module 120.
Preferably, at the duration of work of the integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications 100, under the normal situation of civil power, rectification module 138 provides desired power, gives 48V ferric phosphate lithium cell pack module 120 chargings simultaneously; Under the situation of civil power outage, by 48V ferric phosphate lithium cell pack module 120 electric energy is provided, guarantee that DC power system normally moves, realize the uninterrupted power supply function.One second control module 134 possesses the function of second.Cross when low when the cell voltage of 48V ferric phosphate lithium cell pack module 120, a second control module 134 is cut off 120 power supplies of 48V ferric phosphate lithium cell pack modules, the useful life of protection 48V ferric phosphate lithium cell pack module 120.
In one embodiment, this rectification module 138 can provide the constant current output of 50A.For example, this switch power module 130 can comprise 5 rectification modules 138, thereby the possibility of various output current combinations is provided.
According to the embodiment of the utility model, this inverter module 140 is connected with 48V ferric phosphate lithium cell pack module 120, exchanges output thereby when civil power cuts off the power supply, convert the 48V direct current into 220V.This inverter module 140 can receive the direct current input of 40-58V so that the interchange output of 220V to be provided.
According to the embodiment of the utility model, the integrated 48V ferric phosphate lithium cell of this alternating current-direct current power supply system for communications 100 can also comprise the base 150 that is used to carry 48V ferric phosphate lithium cell pack module 120.Alternatively, these base 150 belows are provided with pulley 152.Purpose of design is in order to reduce the spacing between 48V ferric phosphate lithium cell pack module 120 and the switch power module 130 like this.Simultaneously, for ease problem ferric phosphate lithium cell monomer is changed, can on base, be increased a handle (not shown), make things convenient for push-and-pull base 150.
According to the embodiment of the utility model, this 48V ferric phosphate lithium cell pack module 120 can comprise the monomer ferric phosphate lithium cell of 16 3.2V.
Below with reference to Fig. 2 A, 2B, 2C, describe according to the size of the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications along length, width and short transverse.The corresponding size of numeral on arrow next door among Fig. 2 A-2C, its unit is mm (for a clarity unit of omitting) in the drawings.
Shown in Fig. 2 A-2C, 48V ferric phosphate lithium cell pack module 120, switch power module 130 and inverter module 140 from top to bottom sequence stack in cabinet 110.Clearance between the inboard of 48V ferric phosphate lithium cell pack module 120, switch power module 130 and inverter module 140 and this cabinet 110 can be 10-50mm, for example can be 30mm.
Alternatively, this 48V ferric phosphate lithium cell pack module 120, switch power module 130 and the clearance of inverter module 140 on stacking direction can be 10-50mm, for example can be 30mm.
Alternatively, the length of this 48V ferric phosphate lithium cell pack module 120, switch power module 130 and inverter module 140 can be 482.6mm.
Alternatively, the width of this 48V ferric phosphate lithium cell pack module 120, switch power module 130 and inverter module 140 can be 354-654mm, for example can be 504mm.
Alternatively, the height of this 48V ferric phosphate lithium cell pack module 120, switch power module 130 and inverter module 140 is respectively 200-400mm, 445mm and 88mm.For example, the height of 48V ferric phosphate lithium cell pack module 120 can be 276mm.
Alternatively, the height of this base 150 and this pulley 152 can be 30-70mm, for example can be 30mm or 50mm.
Can be applied to indoor and/or outdoor application scenario according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications.
The indoor macro base station number is many, covers extensively, requires power supply reliable, so two Battery pack power backups are generally all arranged.Big, the preponderance of lead-acid battery floor space in standing, when telephone traffic increase and when causing the dilatation demand in the station space constraints newly added equipment possible.Through adopting according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications, can reduce the floor space of power supply and battery in the machine room, satisfy the demand of equipment dilatation.Simultaneously; The ferric phosphate lithium cell resistance to elevated temperatures is excellent, can starting of air conditioner temperature in the station be brought up to about 35 degree, can reduce the energy consumption of air-conditioning; Effectively cut operating costs through saving the electricity charge, in purpose energy-conservation, that save land, reach aspect the material-saving three energy-saving and emission-reduction.
Outdoor communication base station is owing to environmental problems such as sun direct projections, and built-in service life of lead accumulator is no more than 2 years usually.Yet according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of the utility model power supply system for communications, owing to adopt ferric phosphate lithium cell, resistance to elevated temperatures is excellent, and the life-span can reach 5-10.
The above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (14)
1. the integrated 48V ferric phosphate lithium cell of an alternating current-direct current power supply system for communications (100) comprises the 48V ferric phosphate lithium cell pack module (120) that is contained in the cabinet (110), and it provides the output of 48V direct current when civil power cuts off the power supply; Inverter module (140), it is connected with 48V ferric phosphate lithium cell pack module (120), when civil power cuts off the power supply, converts the 48V direct current into 220V and exchanges output; And switch power module (130),
Wherein this switch power module (130) comprising: modular battery management system (132), and it is used for the charging and the discharge of 48V ferric phosphate lithium cell pack module (120) are managed; And rectification module (138); It is connected with said 48V ferric phosphate lithium cell pack module (120); With at civil power just often through the civil power input rectifying being provided constant current output, and when the battery capacity of 48V ferric phosphate lithium cell pack module (120) descends to this 48V ferric phosphate lithium cell pack module (120) charging.
2. according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of claim 1 power supply system for communications (100); It is characterized in that; This switch power module (130) also comprises charge and discharge monitoring module (136); It is connected with 48V ferric phosphate lithium cell pack module (120); In order to monitoring the parameter of said 48V ferric phosphate lithium cell pack module (120) in charging and discharge process, and this charge and discharge monitoring module (136) is connected with this modular battery management system (132), to said modular battery management system (132) Monitoring Data to be provided.
3. according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of claim 1 power supply system for communications (100); It is characterized in that; This switch power module (130) also comprises a second control module (134), and it is used to protect 48V ferric phosphate lithium cell pack module (120).
4. according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of claim 1 power supply system for communications (100), it is characterized in that this rectification module (138) provides the constant current output of 50A.
5. according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of claim 4 power supply system for communications (100), it is characterized in that this switch power module (130) comprises 5 these rectification modules (138).
6. according to the integrated 48V ferric phosphate lithium cell of alternating current-direct current any among the claim 1-5 power supply system for communications (100); It is characterized in that; Also comprise the base (150) that is used to carry 48V ferric phosphate lithium cell pack module (120), this base (150) below is provided with pulley (152).
7. according to the integrated 48V ferric phosphate lithium cell of the alternating current-direct current of claim 6 power supply system for communications (100), it is characterized in that the height of this base (150) and this pulley (152) is 30-70mm.
8. according to the integrated 48V ferric phosphate lithium cell of alternating current-direct current any among the claim 1-5 power supply system for communications (100); It is characterized in that, this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and inverter module (140) from top to bottom sequence stack in this cabinet (110).
9. according to Claim 8 the integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications (100); It is characterized in that the clearance between the inboard of this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and inverter module (140) and this cabinet (110) is 10-50mm.
10. according to Claim 8 the integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications (100); It is characterized in that this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and the clearance of inverter module (140) on stacking direction are 10-50mm.
11. the integrated 48V ferric phosphate lithium cell of the alternating current-direct current according to Claim 8 power supply system for communications (100); It is characterized in that the length of this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and inverter module (140) is 482.6mm.
12. the integrated 48V ferric phosphate lithium cell of the alternating current-direct current according to Claim 8 power supply system for communications (100); It is characterized in that the width of this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and inverter module (140) is 354-654mm.
13. the integrated 48V ferric phosphate lithium cell of the alternating current-direct current according to Claim 8 power supply system for communications (100); It is characterized in that the height of this 48V ferric phosphate lithium cell pack module (120), switch power module (130) and inverter module (140) is respectively 200-400mm, 445mm and 88mm.
14. the integrated 48V ferric phosphate lithium cell of the alternating current-direct current power supply system for communications (100) according to any among the claim 1-5 is characterized in that this 48V ferric phosphate lithium cell pack module (120) comprises the monomer ferric phosphate lithium cell of 16 3.2V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204451632U CN202309497U (en) | 2011-11-11 | 2011-11-11 | AC-DC integrated 48V lithium iron phosphate battery communication power supply system |
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| CN2011204451632U CN202309497U (en) | 2011-11-11 | 2011-11-11 | AC-DC integrated 48V lithium iron phosphate battery communication power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248114A (en) * | 2013-05-27 | 2013-08-14 | 浙江南峰电气有限公司 | Standby power supply charge-discharge control circuit for far-end communication base station |
| CN109975242A (en) * | 2019-05-05 | 2019-07-05 | 四川省生态环境科学研究院 | A kind of the on-board emission test system and its working method of motor vehicle ammonia |
-
2011
- 2011-11-11 CN CN2011204451632U patent/CN202309497U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248114A (en) * | 2013-05-27 | 2013-08-14 | 浙江南峰电气有限公司 | Standby power supply charge-discharge control circuit for far-end communication base station |
| CN103248114B (en) * | 2013-05-27 | 2015-11-25 | 浙江南峰电气有限公司 | A kind of back-up power source charging-dischargingcontrol control circuit of remote communication base station |
| CN109975242A (en) * | 2019-05-05 | 2019-07-05 | 四川省生态环境科学研究院 | A kind of the on-board emission test system and its working method of motor vehicle ammonia |
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| CB03 | Change of inventor or designer information |
Inventor after: Bao Jing Inventor after: He Xingang Inventor after: Cai Jing Inventor after: He Yanmin Inventor after: Zhang Le Inventor after: Gong Xin Inventor after: Liu Baochang Inventor before: Bao Jing Inventor before: He Xingang Inventor before: Cai Jing |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: BAO JING HE XINGANG CAI JING TO: BAO JING HE XINGANG CAI JING HE YANMIN ZHANG LE GONG XIN LIU BAOCHANG |
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Effective date of registration: 20170811 Address after: 101399 No. 94 Jinma Industrial Zone, Ying Town, Beijing, Shunyi District, Korea Patentee after: Kingeta Group Co.,Ltd. Address before: 100040 Beijing City, Haidian District Beijing spring factory original junction 3-27 Patentee before: Beijing Baohe Elite Technology Co.,Ltd. |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Bao Jing Inventor after: He Xingang Inventor after: Cai Jing Inventor after: Zhang Le Inventor after: Gong Xin Inventor before: Bao Jing Inventor before: He Xingang Inventor before: Cai Jing Inventor before: He Yanmin Inventor before: Zhang Le Inventor before: Gong Xin Inventor before: Liu Baochang |
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Granted publication date: 20120704 |