CN105553030A - Uninterruptable power supply management system of lithium battery - Google Patents

Uninterruptable power supply management system of lithium battery Download PDF

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Publication number
CN105553030A
CN105553030A CN201610071653.8A CN201610071653A CN105553030A CN 105553030 A CN105553030 A CN 105553030A CN 201610071653 A CN201610071653 A CN 201610071653A CN 105553030 A CN105553030 A CN 105553030A
Authority
CN
China
Prior art keywords
lithium battery
voltage
power supply
unit
current
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.)
Pending
Application number
CN201610071653.8A
Other languages
Chinese (zh)
Inventor
程志毓
邱永福
廖志伟
林青雷
张华山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Yilei Electronic Technology Co Ltd
Dongguan University of Technology
Original Assignee
Dongguan Yilei Electronic Technology Co Ltd
Dongguan University of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongguan Yilei Electronic Technology Co Ltd, Dongguan University of Technology filed Critical Dongguan Yilei Electronic Technology Co Ltd
Priority to CN201610071653.8A priority Critical patent/CN105553030A/en
Publication of CN105553030A publication Critical patent/CN105553030A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention relates to an uninterruptable power supply management system of a lithium battery. The uninterruptable power supply management system comprises a DC/DC converter, a central control unit, a temperature detection unit, a current sampling monitoring unit and a voltage sampling balance unit, wherein the temperature detection unit, the current sampling monitoring unit and the voltage sampling balance unit are respectively used for detecting temperature, current and voltage of the lithium battery and sending the detected temperature, current and voltage parameters to the central control unit, the central control unit is used for judging the state of the lithium battery according to the detected temperature, current and voltage parameters and controlling on/off of a lithium battery protection circuit through the DC/DC converter according to state information of the lithium battery, and the uninterruptable power supply management system is characterized by being directly used for acquiring temperature, current and voltage information of the battery and switching on/off the lithium battery protection circuit. By the system, all acquisition units and control units are integrated into an uninterruptable power supply (UPS), the optimal resource configuration is achieved, the hardware redundancy is avoided, and the cost is saved.

Description

A kind of lithium battery uninterrupted power supply management system
Technical field
The present invention relates to a kind of power-supply management system, especially relate to a kind of lithium battery uninterrupted power supply management system.
Background technology
At present, the stability requirement of all trades and professions to system is more and more higher, for large-scale data center, generally all has multichannel UPS(UninterruptablePowerSupply, uninterrupted power supply) system redundancy powers to ensure the stability of system power supply.In current UPS industry field, most type uses non-maintaining lead-acid battery.Lead-acid battery is stablized due to it, and the advantages such as cost is low are widely used at power supply industry field.But lead-acid battery also also exists, and energy density is low, bulking value is large, maintenance period is short, especially the defect such as contaminated environment, along with country is to the attention gradually of green energy resource, the emerging lithium battery energy has greatly the gesture of alternative lead-acid battery, becomes the main energy sources supply of the new period.It is high that lithium battery has possessed energy density relative to lead-acid battery, the advantages such as volume weight is little, and self-discharge rate is low, and maintenance period is long, green non-pollution.But because lithium battery chemical property is comparatively active, needs corresponding BMS in application process and carry out monitoring and protection, mainly cell voltage, the monitoring of electric current and temperature.Existing employing lithium battery as storage battery ups system as shown in Figure 1, need to apply the running parameter that BMS battery management system gathers lithium battery, BMS possesses independently sampling and control unit, can the state of monitoring battery, overcharging, crossing and put, cell circuit can be turned off when overcurrent and excess temperature, prevent battery from occurring overcharge and overdischarge, extend the useful life of battery, the data monitored can be transferred to host computer by CANBUS simultaneously.
And in the middle of UPS, owing to controlling to need, need the voltage of battery, current acquisition to be transferred in the middle of the MCU of UPS equally, realize overcurrent, overvoltage, under-voltage protection etc.And BMS inside is also integrated with cell voltage, current sense; the basic modules such as voltage balance control; overvoltage is carried out based on data such as the voltage gathered, electric current and temperature; the protection of overcurrent and excess temperature, then by the mode of CAN the data collected are transferred to UPS and host computer carries out showing and controlling.Along with the change of power is large, the connection in series-parallel use of lithium battery is corresponding becomes complicated, and current acquisition device and switch control device also increase along with power and become many, and this also makes BMS cost become higher.
Summary of the invention
In order to reduce the module redundancy in UPS and BMS system, reduce the cost of lithium battery ups system, the invention provides a kind of new lithium battery uninterrupted power supply (ups) Unity management system, by the function i ntegration of BMS battery management system in ups system, realize the direct monitor and managment of ups system to lithium battery, reduce the cost of lithium battery ups system.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A kind of lithium battery uninterrupted power supply management system, comprise DC/DC transducer, central control unit, temperature detecting unit, current sample monitoring unit, voltage sample balancing unit, described temperature detecting unit, current sample monitoring unit, voltage sample balancing unit is respectively used to the temperature detecting lithium battery, electric current, voltage, and the temperature that will detect, electric current and voltage parameter send to central control unit, described central control unit is according to the temperature detected, electric current and voltage parameter judge lithium battery state, and pass through according to the state information of lithium battery the break-make that DC/DC transducer controls lithium battery protection circuit, it is characterized in that: described uninterrupted power supply management system directly gathers the temperature of lithium battery, electric current, information of voltage also carries out the break-make of lithium battery protection circuit.
Further, described voltage sample balancing unit, by comparator and voltage-stabiliser tube setting reference voltage, obtains lithium battery output voltage.
Further, also comprise wireless energy control units, lithium battery state information is sent to cloud server by described wireless energy control units, and is forwarded to mobile client.
Beneficial effect of the present invention is as follows:
1) be integrated with the cell voltage of BMS battery management system, current sampling unit, all collecting units and control unit are integrated in UPS, make the optimization of resource distribution, avoid hardware redundancy, save cost;
2) because BMS control unit is simplified, realize UPS and use lithium battery inclusion littlely long-pending, structural design is more flexible.
Accompanying drawing explanation
Fig. 1 is the structural representation that traditional UPS and lithium battery BMS apply;
Fig. 2 is the lithium battery uninterrupted power supply management system schematic diagram of integrated BMS in the present invention;
Fig. 3 is traditional BMS circuit diagram based on S-8254 standard;
Fig. 4 is lithium battery voltage acquisition control circuit figure of the present invention.
Embodiment
Be described in detail to principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Fig. 2 is the structural representation of lithium battery uninterrupted power supply management system of the present invention, wherein, voltage sample balancing unit often saves the output voltage of lithium battery for obtaining, current sample monitoring unit is for obtaining the output current of lithium battery, temperature detecting unit is for obtaining the working temperature of lithium battery, and by obtained voltage, electric current, temperature information is sent to the central control unit (MCU) of ups system, central control unit is according to the temperature detected, electric current and voltage parameter judge the state of lithium battery, and pass through according to the state information of lithium battery the break-make that DC/DC transducer controls lithium battery protection circuit, realize the overcurrent of lithium battery, overvoltage and overtemperature protection.Below will be described in detail to unit.
In order to be described modules, first the BMS protection circuit based on S-8254 standard in prior art is introduced.As shown in Figure 3, VC1, VC2, VC3, VC4 sample the voltage of 4 joint lithium batteries respectively, number are transferred to the electric current that VINI obtains lithium battery by the current sense of Rsense, COP and DOP signal overcharges and cross discharge signal switched charge FET and electric discharge FET.In the situation of big current, need the resistance of Rsense very little, power is very large, and cost is higher, and heat radiation also can have problems, and simultaneously along with power becomes large, the FET of discharge and recharge also needs and then to become large.
In an embodiment of the present invention, the mode as Fig. 4 is adopted to realize voltage sample and the control of lithium battery.First detect the voltage of each batteries, wherein V2 is two batteries total voltages, and V1 is a batteries voltage, the second section cell voltage of series connection is V2-V1, obtain Vout by subtracter, by comparator and voltage-stabiliser tube setting reference voltage Vref, obtain the output voltage often saving lithium battery.The signal of initial ToMCU is in high level; when Vout is less than Vref by the dividing potential drop of R7 and R8; comparator exports as low level; also or Vout by the dividing potential drop of R5 and R6 higher than Vref; output also can drag down by comparator; overcharging and excessively putting of lithium battery is achieved in UPS protection circuit; when lithium battery overvoltage and the under-voltage Fault Signal transmissions that all can pass through are to MCU; if overvoltage; then MCU will charge closing device, if under-voltage, namely MCU closes DC/DC; DC/AC device, opens charger and charges to inverter.In the present embodiment; according to the application characteristic of lithium battery; amplitude and the over-voltage protection point of single-unit charging voltage are set; and the charging voltage of power brick and over-voltage protection point; no matter single-unit voltage or total voltage have exceeded pressure limiting point; MCU is delivered to by protective circuit in capital, closes SW3 realize protection by MCU.
Battery current is directly transferred in UPS by sampling circuit, and because sample rate current also take part in the control of DC/DC converter, this current value accuracy is very high.When serial battery, the electric current of every batteries voltage is all the same, and UPS gathers electric current and is battery current.When current amplitude has exceeded pre-set threshold value, MCU closes SW3 and cuts cell circuit.When charging current is very little time, i.e. charge closing device.
The temperature often saving lithium battery is obtained by temperature sensor, and select by manner of comparison the MCU that the highest temperature and minimum temperature are transferred to UPS, MCU judges whether the temperature gathered drops in the middle of the interval of setting, can send order turn off SW3 charge closing device or boost module beyond scope.
UPS is in battery applications circuit, and the voltage of the battery collected, electric current and temperature parameter add in DC/DC controller, the battery voltage sampling of lithium battery BMS and current sample circuit are integrated in the middle of the sampling of UPS thus.In UPS course of normal operation; DC/DC controller charges to battery; now monitoring charging voltage and charging current, being ensured that charging voltage can not exceed default float charge voltage, especially being turned off the switching tube of DC/DC transducer when exceeding over-voltage protection point by MCU.UPS is operated in battery mode when power is off; the discharging current of same collection battery and discharge voltage; ensure that discharging current excessively can not cause expendable injury to battery, if discharge voltage is lower than the protection point preset simultaneously, then on-off switching tube cuts off battery discharge loop and ensures battery life.No matter in charging or discharge process, ups system all can detect battery temperature simultaneously, when temperature is beyond the upper limit of design temperature or roll off the production line, all can cut off the safety that cell circuit ensures battery applications in time.
The real-time of battery protection information is extremely important; in another embodiment; the overvoltage that ups system collects, under-voltage, overcurrent; the wireless energy control units of alarm by being connected with ups system of excess temperature; be sent to cloud server and be forwarded to mobile client, user so just can be made to know present battery status whenever and wherever possible, when avoiding power-off, dead battery lost efficacy; the phenomenons such as over-charging of battery is abnormal, bring convenience to safeguarding, changing.
The foregoing is only several embodiments of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a lithium battery uninterrupted power supply management system, comprise DC/DC transducer, central control unit, temperature detecting unit, current sample monitoring unit, voltage sample balancing unit, described temperature detecting unit, current sample monitoring unit, voltage sample balancing unit is respectively used to the temperature detecting lithium battery, electric current, voltage, and the temperature that will detect, electric current and voltage parameter send to central control unit, described central control unit is according to the temperature detected, electric current and voltage parameter judge lithium battery state, and pass through according to the state information of lithium battery the break-make that DC/DC transducer controls lithium battery protection circuit, it is characterized in that: described uninterrupted power supply management system directly gathers the temperature of lithium battery, electric current, information of voltage also carries out the break-make of lithium battery protection circuit.
2. lithium battery uninterrupted power supply management system according to claim 1, is characterized in that: described voltage sample balancing unit, by comparator and voltage-stabiliser tube setting reference voltage, obtains lithium battery output voltage.
3. lithium battery uninterrupted power supply management system according to claim 1, it is characterized in that: also comprise wireless energy control units, lithium battery state information is sent to cloud server by described wireless energy control units, and is forwarded to mobile client.
CN201610071653.8A 2016-02-02 2016-02-02 Uninterruptable power supply management system of lithium battery Pending CN105553030A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107046277A (en) * 2017-04-18 2017-08-15 深圳市赢新光电发展有限公司 A kind of battery bag under-voltage protecting circuit
CN108647870A (en) * 2018-04-28 2018-10-12 广东日月潭电源科技有限公司 A kind of ups power ownership determination method and system based on Internet of Things network interface card

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1556573A (en) * 2004-01-06 2004-12-22 春兰(集团)公司 Real time on line uninterrupted direct current power source
JP2005102469A (en) * 2003-09-05 2005-04-14 Sanyo Electric Co Ltd Power supply unit and power supply system having same
CN103595117A (en) * 2012-08-14 2014-02-19 煤炭科学研究总院 A downhole UPS power management monitoring system
CN204391796U (en) * 2014-12-30 2015-06-10 天津智新信息科技有限公司 A kind of ups system
CN204928218U (en) * 2015-07-21 2015-12-30 深圳市佰特瑞储能系统有限公司 Lead acid battery control system and intelligent system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005102469A (en) * 2003-09-05 2005-04-14 Sanyo Electric Co Ltd Power supply unit and power supply system having same
CN1556573A (en) * 2004-01-06 2004-12-22 春兰(集团)公司 Real time on line uninterrupted direct current power source
CN103595117A (en) * 2012-08-14 2014-02-19 煤炭科学研究总院 A downhole UPS power management monitoring system
CN204391796U (en) * 2014-12-30 2015-06-10 天津智新信息科技有限公司 A kind of ups system
CN204928218U (en) * 2015-07-21 2015-12-30 深圳市佰特瑞储能系统有限公司 Lead acid battery control system and intelligent system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107046277A (en) * 2017-04-18 2017-08-15 深圳市赢新光电发展有限公司 A kind of battery bag under-voltage protecting circuit
CN107046277B (en) * 2017-04-18 2020-10-02 深圳市赢新光电发展有限公司 Battery package undervoltage protection circuit
CN108647870A (en) * 2018-04-28 2018-10-12 广东日月潭电源科技有限公司 A kind of ups power ownership determination method and system based on Internet of Things network interface card

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Application publication date: 20160504

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