CN108667088B - Lithium battery energy storage system supporting UPS with neutral line - Google Patents
Lithium battery energy storage system supporting UPS with neutral line Download PDFInfo
- Publication number
- CN108667088B CN108667088B CN201810301436.2A CN201810301436A CN108667088B CN 108667088 B CN108667088 B CN 108667088B CN 201810301436 A CN201810301436 A CN 201810301436A CN 108667088 B CN108667088 B CN 108667088B
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- Prior art keywords
- lithium battery
- battery pack
- switch
- ups
- lower half
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- 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
Abstract
The invention relates to a lithium battery energy storage system supporting a UPS with a neutral line, which comprises a lithium battery pack and a UPS host, wherein the lithium battery pack is connected with the anode and the cathode of the UPS host through a battery management system, a positive electrode lead of the lithium battery pack is connected with a charging switch at the upper half section of the lithium battery pack and a discharging switch at the upper half section of the lithium battery pack in parallel, and the charging switch at the upper half section of the lithium battery pack and the discharging switch at the upper half section of the lithium battery pack are respectively connected with diodes in series; the negative electrode lead of the lithium battery pack is connected with the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch in parallel, the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch are respectively connected with diodes in series, and a battery neutral line is arranged between the lithium battery pack and the UPS host. The charging and discharging loop is partitioned in the BMS, and the charging is independently monitored and controlled by the upper part and the lower part, so that the problems of overcharging and overdischarging of the battery are solved, and the problem of inconsistent voltage capacity of the upper half battery and the lower half battery is effectively solved.
Description
Technical Field
The invention relates to power supply guarantee equipment, in particular to a lithium battery energy storage system supporting UPS with a neutral line.
Background
The UPS power supply, i.e., uninterruptible power supply, is a system device that connects a storage battery with a host, and converts dc power into utility power through a module circuit such as a host inverter. In the current UPS power supply field, the proportion of the applied lead-acid solution is up to more than 90%, however, in recent years, the rapid development of the lithium battery technology is also gradually remarkable, and compared with the traditional lead-acid battery, the lithium battery has the advantages of high energy density, small volume, large discharge multiplying power, light weight, long service life, wide use temperature range and the like, and the lithium battery UPS solution has become a new choice for customers.
The UPS is divided into a power frequency machine and a high frequency machine according to the working frequency of a designed circuit. The industrial frequency machine is designed by using the traditional analog circuit principle, and the internal power devices (such as a transformer, an inductor, a capacitor and the like) of the machine are larger, so that smaller noise is generally generated when the machine runs under a larger load, but the machine has stronger resistance in severe power grid environment conditions, and the reliability and the stability are higher than those of the high frequency machine. The high frequency machine uses microprocessor (CPU chip) as processing control center, and writes complicated hardware analog circuit into the microprocessor, and uses software program to control UPS operation. Therefore, the volume is greatly reduced, the weight is greatly reduced, the manufacturing cost is low, and the selling price is relatively low. The inversion frequency of the high-frequency machine is generally above 20 KHZ. But the high-frequency machine has poor tolerance under severe power grid and environmental conditions, and is more suitable for the environment with stable power grid, less dust and proper temperature/humidity.
In actual use, the UPS of the high-frequency machine needs to be connected with a neutral line, and the neutral line equally divides the battery pack into an upper part and a lower part; when the traditional lead-acid storage battery is adopted, due to the charge-discharge characteristics, proper float charge voltage and charge current are set; if the lithium battery adopts a lead-acid method, the overcharge or overdischarge phenomenon of the lithium battery pack is easy to occur.
Disclosure of Invention
Aiming at the current state of the art, the technical problem to be solved by the invention is to provide the lithium battery energy storage system with the neutral line UPS, which not only solves the problems of overcharging and overdischarging of batteries, but also can effectively solve the problem of inconsistent voltage capacity of the lower half sections of the upper and the lithium battery packs.
The technical scheme adopted for solving the technical problems is as follows: the lithium battery energy storage system comprises a lithium battery pack and a UPS host, wherein the lithium battery pack is connected with the anode and the cathode of the UPS host through a battery management system, a positive electrode lead of the lithium battery pack is connected with a lithium battery pack upper half charging switch and a lithium battery pack upper half discharging switch in parallel, and the lithium battery pack upper half charging switch and the lithium battery pack upper half discharging switch are respectively connected with diodes in series; the negative electrode lead of the lithium battery pack is connected with the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch in parallel, the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch are respectively connected with diodes in series, and a battery neutral line is arranged between the lithium battery pack and the UPS host.
Further, the battery management system comprises an MCU, a current sensor connected with the MCU, a human-machine interface HMI and a battery management unit BMU, wherein the battery management unit is respectively connected with the anode and the cathode of the single battery, an analog-to-digital converter is arranged between the current sensor and the MCU, and a main negative contactor and a main positive contactor of the battery management unit BMU respectively control the connection of an upper half charging switch of a battery pack, an upper half discharging switch of a lithium battery pack, a lower half charging switch of the lithium battery pack and a lower half discharging switch of the lithium battery pack, wherein:
the current sensor is used for detecting the current of the lithium battery pack;
the battery management unit BMU is used for detecting the voltage of the single battery;
the human-machine interface HMI is used for the medium for interaction and information exchange between the system and the user.
Furthermore, the battery management system is communicated with the UPS host through an RS232 bus, an RS485 bus and a CAN bus, or the battery management system outputs signals through a dry contact and a wet contact of the UPS host.
Compared with the prior art, the invention has the beneficial effects that: the scheme is characterized in that the charging and discharging loops are partitioned inside the BMS, the charging is independently monitored and controlled by the upper part and the lower part, the problems of overcharging and overdischarging of the battery are solved, and the problem of inconsistent voltage capacity of the upper half battery and the lower half battery is effectively solved. The design of the invention is suitable for large-scale popularization.
Drawings
FIG. 1 is a diagram of the circuit connection of the present invention;
FIG. 2 is a block diagram of a battery management system connection of the present invention;
fig. 3 is a circuit connection relation diagram of embodiment 2 of the present invention.
Detailed Description
The following description of the preferred embodiments, but not all embodiments, will be made in connection with the accompanying drawings of embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For ease of description, the following appears: the upper half discharge switch of the lithium battery pack is represented by K1, the upper half charge switch K2 of the lithium battery pack is represented by K3, and the lower half charge switch of the lithium battery pack is represented by K4.
As shown in fig. 1-2, a lithium battery energy storage system supporting a UPS with a neutral line includes a lithium battery pack and a UPS host, wherein the lithium battery pack is connected with the positive electrode and the negative electrode of the UPS host through a battery management system, a positive electrode lead of the lithium battery pack is connected in parallel with a charging switch at the upper half section of the lithium battery pack and a discharging switch at the upper half section of the lithium battery pack, and the charging switch at the upper half section of the lithium battery pack and the discharging switch at the upper half section of the lithium battery pack are respectively connected in series with diodes; the negative electrode lead of the lithium battery pack is connected with the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch in parallel, the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch are respectively connected with diodes in series, and a battery neutral line is arranged between the lithium battery pack and the UPS host.
The battery management system comprises an MCU, a current sensor, a human-machine interface HMI and a battery management unit BMU, wherein the current sensor, the human-machine interface HMI and the battery management unit BMU are connected with the MCU, the battery management unit is respectively connected with the anode and the cathode of a single battery, an analog-to-digital converter is arranged between the current sensor and the MCU, and a main negative contactor and a main positive contactor of the battery management unit BMU respectively control the connection of a battery pack upper half charging switch, a lithium battery pack upper half discharging switch, a lithium battery pack lower half charging switch and a lithium battery pack lower half discharging switch, wherein:
the current sensor is used for detecting the current of the lithium battery pack;
the battery management unit BMU is used for detecting the voltage of the single battery;
the human-machine interface HMI is used for the medium for interaction and information exchange between the system and the user.
The battery management system is communicated with the UPS host through an RS232, an RS485 and a CAN bus, or the battery management system outputs signals through a dry contact and a wet contact of the UPS host.
The battery management system monitors the voltage and the temperature of all the single batteries and controls the charging switch according to the information such as the voltage, the current, the temperature and the like: opening or closing of K2 and K4, and discharging switch: k1, K3 are open or closed.
Working principle:
upper half charging loop
UPS+→K2 → D2 →BAT+ → M
When the battery management system detects that the single voltage is overcharged, over-temperature and overcharged, the switch K2 is opened, and otherwise, the switch K2 is closed.
Upper half discharge loop
BAT+ → D1 → K1→ UPS+→ M
When the battery management system detects over-discharge, over-temperature and over-discharge of the single voltage, the switch K1 is opened, otherwise, the switch K1 is closed.
Lower half charging loop
M→ BAT- → D4 →K4 → UPS-
When the battery management system detects that the single voltage is overcharged, over-temperature and overcharged, the switch K3 is opened, and otherwise, the switch K3 is closed.
Lower half discharge loop
M→ UPS- → K3→ D3 → BAT-
When the battery management system detects that the single voltage is over-discharged, over-heated and over-discharged, the switch K3 is opened, otherwise, the switch K is closed.
Example 2
Compared with the embodiment 1, the difference of the embodiment is that the plurality of lithium battery packs can adopt a modularized design, specifically, every two lithium battery packs adopt up-down symmetrical distribution, wherein the lithium battery pack arranged at the upper end adopts the upper half section wiring structure of the lithium battery pack in the embodiment 1; the lower-end-placed lithium battery pack adopts the lower-half wiring structure of the lithium battery pack in example 1; and the management of a plurality of lithium battery packs can be realized by analogy, and the UPS capacity-expansion lithium battery energy storage system is completed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (2)
1. The lithium battery energy storage system is characterized in that a positive electrode lead of the lithium battery pack is connected with a lithium battery pack upper half charging switch and a lithium battery pack upper half discharging switch in parallel, and the lithium battery pack upper half charging switch and the lithium battery pack upper half discharging switch are respectively connected with diodes in series; the lithium battery pack is characterized in that a negative electrode lead of the lithium battery pack is connected with a lithium battery pack lower half charging switch and a lithium battery pack lower half discharging switch in parallel, the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch are respectively connected with diodes in series, a battery neutral line is arranged between the lithium battery pack and a UPS host, a battery management system comprises an MCU, a current sensor, a human-machine interface HMI and a battery management unit BMU, the battery management unit is respectively connected with a single battery positive electrode and a single battery negative electrode, an analog-to-digital converter is arranged between the current sensor and the MCU, and a main negative contactor and a main positive contactor of the battery management unit BMU respectively control the connection of the battery pack upper half charging switch, the lithium battery pack upper half discharging switch, the lithium battery pack lower half charging switch and the lithium battery pack lower half discharging switch, wherein: the current sensor is used for detecting the current of the lithium battery pack; the battery management unit BMU is used for detecting the voltage of the single battery; the human-machine interface HMI is used for the medium for interaction and information exchange between the system and the user, the lithium battery energy storage system supporting the in-band neutral line UPS comprises an upper half charging loop, an upper half discharging loop, a lower half charging loop and a lower half discharging loop,
the upper half charging loop sequentially comprises a UPS positive electrode UPS+, an upper half charging switch K2, a diode D2, a first lithium battery pack positive electrode BAT+ and a neutral line M, wherein when the battery management system detects that the single voltage is overcharged, over-temperature and overcharged, the upper half charging switch K2 is opened, otherwise, the upper half charging switch K2 is closed;
the upper half discharge loop sequentially comprises a first lithium battery pack anode BAT+, a diode D1, a pack upper half discharge switch K1, a UPS anode UPS+ and a neutral line M, when the battery management system detects that the single voltage is over-discharged, over-heated and discharged, the upper half discharge switch K1 is opened, otherwise, the battery management system is closed;
the lower half charging loop comprises a neutral line M, a second lithium battery pack cathode BAT-, a diode D4, a lower half charging switch K4 and a UPS cathode UPS-, when the battery management system detects that the single voltage is overcharged, over-heated and overcharged, the lower half charging switch K4 is opened, and otherwise, the lower half charging switch K4 is closed;
the lower half discharge loop comprises a neutral line M, UPS negative electrode UPS-, a lower half discharge switch K3, a diode D3 and a second lithium battery pack negative electrode BAT-, and when the battery management system detects that the single voltage is over-discharged, over-heated and over-discharged, the lower half discharge switch K3 is opened, otherwise, the lower half discharge switch K3 is closed.
2. The lithium battery energy storage system supporting a neutral line UPS according to claim 1, wherein the battery management system communicates with the UPS host via RS232, RS485, CAN bus, or the battery management system outputs signals via dry and wet contacts of the UPS host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810301436.2A CN108667088B (en) | 2018-04-05 | 2018-04-05 | Lithium battery energy storage system supporting UPS with neutral line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810301436.2A CN108667088B (en) | 2018-04-05 | 2018-04-05 | Lithium battery energy storage system supporting UPS with neutral line |
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| Publication Number | Publication Date |
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| CN108667088A CN108667088A (en) | 2018-10-16 |
| CN108667088B true CN108667088B (en) | 2023-09-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111711239A (en) * | 2020-06-17 | 2020-09-25 | 芜湖楚睿智能科技有限公司 | Lithium battery energy storage system of semiconductor wafer factory |
| CN117791825A (en) * | 2024-02-26 | 2024-03-29 | 合肥安赛思半导体有限公司 | UPS lithium battery charging loop and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201430545Y (en) * | 2009-06-19 | 2010-03-24 | 雷诺士(常州)电子有限公司 | Voltage booster device of uninterruptible power source |
| CN104052116A (en) * | 2014-06-17 | 2014-09-17 | 深圳市雄韬电源科技股份有限公司 | Uninterrupted power system for lithium ion battery |
| CN104485709A (en) * | 2014-12-16 | 2015-04-01 | 天津神鹿能源有限公司 | Power-taking circuit of lithium battery management system for preventing overdischarge in UPS |
| CN205051428U (en) * | 2015-10-23 | 2016-02-24 | 山东精工电子科技有限公司 | Ups |
| CN207977764U (en) * | 2018-04-05 | 2018-10-16 | 宁波兆科新能源科技有限公司 | It is a kind of to support the lithium battery energy storage battery system with center line UPS |
-
2018
- 2018-04-05 CN CN201810301436.2A patent/CN108667088B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201430545Y (en) * | 2009-06-19 | 2010-03-24 | 雷诺士(常州)电子有限公司 | Voltage booster device of uninterruptible power source |
| CN104052116A (en) * | 2014-06-17 | 2014-09-17 | 深圳市雄韬电源科技股份有限公司 | Uninterrupted power system for lithium ion battery |
| CN104485709A (en) * | 2014-12-16 | 2015-04-01 | 天津神鹿能源有限公司 | Power-taking circuit of lithium battery management system for preventing overdischarge in UPS |
| CN205051428U (en) * | 2015-10-23 | 2016-02-24 | 山东精工电子科技有限公司 | Ups |
| CN207977764U (en) * | 2018-04-05 | 2018-10-16 | 宁波兆科新能源科技有限公司 | It is a kind of to support the lithium battery energy storage battery system with center line UPS |
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| CN108667088A (en) | 2018-10-16 |
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