CN203368009U - Lithium cell automatic circulating current control and protecting circuit for energy storage power station - Google Patents

Lithium cell automatic circulating current control and protecting circuit for energy storage power station Download PDF

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Publication number
CN203368009U
CN203368009U CN 201320372859 CN201320372859U CN203368009U CN 203368009 U CN203368009 U CN 203368009U CN 201320372859 CN201320372859 CN 201320372859 CN 201320372859 U CN201320372859 U CN 201320372859U CN 203368009 U CN203368009 U CN 203368009U
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control
circulation
bhc
main contactor
module
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CN 201320372859
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Chinese (zh)
Inventor
徐�明
付新宏
张伟
董丽伟
史玲玲
盛龙
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ANHUI WICOM NEW ENERGY TECHNOLOGY Co Ltd
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ANHUI WICOM NEW ENERGY TECHNOLOGY Co Ltd
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Abstract

The utility model discloses a lithium cell automatic circulating current control and protecting circuit for an energy storage power station. A voltage acquisition circuit BMU is connected with an anode and a cathode of a single cell of each serially connected cell set. The output end of the voltage acquisition circuit BMU is connected with an input port of a control module BCU. One end of a charging/inverting module PCS is connected with a parallelly connected total anode, and the other end is connected with a parallelly connected total cathode of the cell set. One end of a main contactor is connected with the parallelly connected total anode, and the other end is connected with and controls the anode of the cell set. A circulating current control and protecting module BHC is connected with two ends of the main contactor in parallel. The circulating current control and protecting module BHC and the control signal end of the control module BCU are respectively connected with two control signal ends of the main contactor.

Description

A kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit
Technical field
the utility model relates to the energy-accumulating power station field, is specially a kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit.
Background technology
The key technology of Development of Electric Vehicles is dynamic lithium battery.A large amount of lithium batteries are composed in series the lithium battery group, for electric automobile provides power.Lower than 80%, for the safety of electric motor car, according to the gradient of electrokinetic cell, utilize principle when dynamic lithium battery cycle life, electrokinetic cell manufacturing enterprise can be to the recycling of old and useless battery, for energy-accumulating power station.
The battery of the group number of installing for battery in large-scale energy-storage system and every group of series connection is more, otherness due to battery (particularly reclaiming lithium battery), during many sets in parallel operation, can form the high battery pack batteries charging (this be circulation) low to voltage of voltage between battery pack, when voltage difference is larger, when the battery pack relay closes because the internal resistance of battery pack is very little, now can form very large circulation, even burn fuse, so large-scale energy-storage system must be resolved circulation problem, system is work reliably, so should design a kind of protective circuit with automatic ring flow control function.
At present, energy-accumulating power station adopts the mode of DC/DC by the inversion unit of each battery pack and system (DC/AC) isolation, and this circulation control protection electric circuit is comparative maturity, but cost is high.Be illustrated in figure 2 common energy-accumulating power station systematic schematic diagram.
In this system, the DC/DC conversion module is isolated the DC bus circuit of battery pack and system; Operation principle is: when PCS is operated in the AC/DC mode, other electrical power storage is got off, system is during to batteries charging, and the DC/DC conversion module is that the required charging voltage of battery pack and electric current charge to every Battery pack by the voltage transformation of system DC bus; When electric discharge, by the voltage transformation of battery pack, be that DC bus voltage is DC/AC for PCS, the generating electricity by way of merging two or more grid systems of completion system.In certain group single lithium battery abnormal in the charge or discharge process after, the BCU(battery control unit) control relay is disconnected, and break away from DC bus; After abnormal restoring, closing relay, put into this Battery pack in system again again.
Because energy-accumulating power station power is larger, current single battery finite capacity, voltage is limited, is difficult to meet user's demand.Therefore lithium battery generally adopts connection in series-parallel to use, form connection in series-parallel battery bunch and group, to increase the power output of lithium battery, meet user's actual demand, so be parallel with in actual use many groups at present, a DC/DC conversion module needs to connect between every group of homologous ray.Because DC/DC conversion module cost is higher, so increase the system cost of energy-accumulating power station.
The utility model content
The problem of circulation charge and discharge protecting between group when in parallel for prior art energy-accumulating power station lithium battery group; the present invention proposes a kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit; there is volume little; cost is low; safe characteristics; and do not need manually to go operation, reduced operating personnel's work danger.
The technical scheme that the utility model adopts is:
A kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit, comprise many group series batteries, every group of series battery is in series by a plurality of cells respectively, it is characterized in that: also comprise control module BCU, charging/inversion module PCS, system management module BAU, many group voltage collection circuit BMU and circulation control and protection module BHC, many group voltage collection circuit BMU are connected with the both positive and negative polarity of the cell of each series battery by the voltage detecting winding displacement respectively, and the output of voltage collection circuit BMU is connected with the input port of control module BCU, the end of charging/inversion module PCS and total anodal being connected of parallel connection, the other end is connected with battery pack total negative pole in parallel, one end of main contactor and total anodal being connected of parallel connection, the other end is connected control with battery anode, circulation control and protection module BHC is connected in parallel on the main contactor two ends.The control signal of circulation control and protection module BHC and control module BCU is the two ends of main contactor control signal respectively.
Described a kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit is characterized in that: circulation control and protection module BHC is connected in parallel on input, the output two ends of main contactor, and BHC is by current-limiting resistance R for circulation control and protection module lIM, low current sensor, operational amplifier N1 and LM324, reference source and control relay form; circulation control and protection module BHC is connected in parallel on the main contactor two ends; cut-off/close when the control main contactor produces circulation between battery pack automatically; by in the current-limiting resistance input coefficient, the circulation between battery pack is restricted to minimum simultaneously.
Described a kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit, it is characterized in that: circulation control and protection module BHC, automatically control the circulation of energy-accumulating power station system stored energy battery pack, when the high battery pack of the voltage battery power discharge low to voltage, the battery pack that circulation control and protection module BHC automatic control electric forces down disconnects contactor, and automatically dropping into current-limiting resistance, the charging current of restriction circulation is in the milliampere level; When the charging ring flow valuve is less than several MAHs, now the voltage of system total voltage and this battery pack equates circulation control and protection module BHC auto-closing contactor substantially; When this group has electric discharge circulation, circulation control and protection also auto-closing contactor, for the inversion electric discharge, meets inversion module zero millisecond switching.
Compared with prior art, advantage of the present utility model is:
1, realized the automatic chopsticks that between battery pack, circulation is automatically controlled and normally discharged and recharged, need not manual operation.
2, this circuit volume is little, and cost is low, so practical.
3, real-time strengthens.Current collection circuit can detect circulation between the battery pack group in real time, by control module, controls corresponding protective circuit.
4, realized the circulation of energy-accumulating power station lithium battery group is controlled to function.
The accompanying drawing explanation
Fig. 1 is the utility model schematic diagram.
Fig. 2 is the prior art circuits schematic diagram.
Fig. 3 is circulation control unit (whether being exactly circulation control and protection module BHC) circuit theory diagrams.
Embodiment
As shown in Figure 1.A kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit, comprise many group series batteries, every group of series battery is in series by a plurality of cells respectively, also comprise control module BCU, charging/inversion module PCS, system management module BAU, many group voltage collection circuit BMU and circulation control and protection module BHC, many group voltage collection circuit BMU are connected with the both positive and negative polarity of the cell of each series battery by the voltage detecting winding displacement respectively, and the output of voltage collection circuit BMU is connected with the input port of control module BCU, the end of charging/inversion module PCS and total anodal being connected of parallel connection, the other end is connected with battery pack total negative pole in parallel, one end of main contactor and total anodal being connected of parallel connection, the other end is connected control with battery anode, circulation control and protection module BHC is connected in parallel on the main contactor two ends.The control signal of circulation control and protection module BHC and control module BCU is the two ends of main contactor control signal respectively.
As shown in Figure 3: described a kind of energy-accumulating power station lithium battery automatic ring current control and protective circuit is characterized in that: circulation control and protection module BHC is connected in parallel on input, the output two ends of main contactor, and BHC is by current-limiting resistance R for circulation control and protection module lIM, low current sensor, operational amplifier N1 and LM324, reference source and control relay form; circulation control and protection module BHC is connected in parallel on the main contactor two ends; cut-off/close when the control main contactor produces circulation between battery pack automatically; by in the current-limiting resistance input coefficient, the circulation between battery pack is restricted to minimum simultaneously.
Circulation control and protection module BHC, automatically control the circulation of energy-accumulating power station system stored energy battery pack, when the high battery pack of the voltage battery power discharge low to voltage, the battery pack that circulation control and protection module BHC automatic control electric forces down disconnects contactor, and automatically dropping into current-limiting resistance, the charging current of restriction circulation is in the milliampere level; When the charging ring flow valuve is less than several MAHs, now the voltage of system total voltage and this battery pack equates circulation control and protection module BHC auto-closing contactor substantially; When this group has electric discharge circulation, circulation control and protection also auto-closing contactor, for the inversion electric discharge, meets inversion module zero millisecond switching.
The detection principle is:
When battery pack circulation is electric discharge, loop current current flowing transducer will be arranged, the M end output voltage signal VM of JP1 is that negative signal is transformed to positive signal through N1A:3 input (inverter be comprised of operational amplifier LM324) by negative signal, be input to the positive input of N1B:5 with the reference voltage of N1B:6 negative input relatively, as V+ > N1B:7 output high level is received the base stage that drives triode V1 through resistance R 10 during VREF, now triode V1 conducting, thereby make relay K 1 line bag ground connection, the K1 adhesive, the closing of contact of relay, general-24V outputs to JP2, JP2 connects the negative pole end that main contactor is controlled, the positive terminal that control signal+the connection main contactor is controlled from BCM, the main contactor closure is by this Battery pack connecting system, when V+<VREF, N1B:5 is output as low level and receives the base stage that drives triode V1 through resistance R 10, now triode V1 cut-off, thereby make relay K 1 line bag meet 12V, K1 disconnects, the contact of relay disconnects, the JP2 no-output, main contactor disconnects, and current-limiting resistance is accessed to control circulation simultaneously.
When battery pack circulation is charging, loop current current flowing transducer will be arranged, the M end output voltage signal of JP1 is positive signal VM, be input to the positive input of N1C:10 with the reference voltage of N1B:9 negative input relatively, as VM > N1C:8 output high level is received the base stage that drives triode V1 through resistance R 10 during VREF, now triode V1 conducting, thereby make relay K 1 line bag ground connection, the K1 adhesive, the closing of contact of relay, general-24V outputs to JP2, JP2 connects the negative pole end that main contactor is controlled, the positive terminal that control signal+the connection main contactor is controlled from BCM, the main contactor closure is by this Battery pack connecting system, when VM<VREF, the N1C:8 output low level is received the base stage that drives triode V1 through resistance R 10, now triode V1 cut-off, thus make relay K 1 line bag meet 12V, K1 disconnects, and the contact of relay disconnects, the JP2 no-output, main contactor disconnects, and current-limiting resistance is accessed to control circulation simultaneously.Relatively use the employing source of stable pressure TL431 of reference voltage VREF; R1 is current-limiting resistance; R2 and R3 control output valve to obtain proportion resistor; Can, by regulating R2 and the R3 value of U1, regulate the magnitude of voltage of VREF, as the threshold value of controlling circulation.
The present invention detects the circulation between battery pack in real time by circulation control and protection module, and carries out corresponding handling procedure according to the size of circulation.When being in the circulation discharge condition between battery pack, current collection circuit collects the stagnation pressure of battery pack lower than the bus stagnation pressure, BHC to main contactor circuit output control signal-enable signal, this signal and from BCM to main contactor circuit output control signal+enable signal co-controlling main contactor; When the control section of main contactor and the BCU enable signal while from BHC are effective; Thereby make the main contactor adhesive, this Battery pack is put in system automatically.When battery pack is in the circulation charged state, current collection circuit collects the stagnation pressure of battery pack lower than the bus stagnation pressure, BHC circuit output charging inhibit signal, thus main contactor is disconnected, this Battery pack is disconnected and automatically drop into current-limiting resistance in system.When battery pack is in normal charge and discharge state, when the output that current collection circuit collects battery pack reaches predetermined value greatly, BHC is to main contactor circuit output charging enable signal.This signal and from BCM to main contactor circuit output control signal+enable signal co-controlling main contactor; When the control section of main contactor and the BCU enable signal while from BHC are effective; Thereby make the main contactor adhesive, this Battery pack is put in system automatically.

Claims (3)

1. an energy-accumulating power station lithium battery automatic ring current control and protective circuit, comprise many group series batteries, every group of series battery is in series by a plurality of cells respectively, it is characterized in that: also comprise control module BCU, charging/inversion module PCS, system management module BAU, many group voltage collection circuit BMU and circulation control and protection module BHC, many group voltage collection circuit BMU are connected with the both positive and negative polarity of the cell of each series battery by the voltage detecting winding displacement respectively, and the output of voltage collection circuit BMU is connected with the input port of control module BCU, the end of charging/inversion module PCS and total anodal being connected of parallel connection, the other end is connected with battery pack total negative pole in parallel, one end of main contactor and total anodal being connected of parallel connection, the other end is connected control with battery anode, circulation control and protection module BHC is connected in parallel on the main contactor two ends, the control signal of circulation control and protection module BHC and control module BCU is the two ends of main contactor control signal respectively.
2. a kind of energy-accumulating power station lithium battery automatic ring current control according to claim 1 and protective circuit is characterized in that: circulation control and protection module BHC is connected in parallel on input, the output two ends of main contactor, and BHC is by current-limiting resistance R for circulation control and protection module lIM, low current sensor, operational amplifier N1 and LM324, reference source and control relay form; circulation control and protection module BHC is connected in parallel on the main contactor two ends; cut-off/close when the control main contactor produces circulation between battery pack automatically; by in the current-limiting resistance input coefficient, the circulation between battery pack is restricted to minimum simultaneously.
3. a kind of energy-accumulating power station lithium battery automatic ring current control according to claim 1 and protective circuit, it is characterized in that: circulation control and protection module BHC, automatically control the circulation of energy-accumulating power station system stored energy battery pack, when the high battery pack of the voltage battery power discharge low to voltage, the battery pack that circulation control and protection module BHC automatic control electric forces down disconnects main contactor, and automatically dropping into current-limiting resistance, the charging current of restriction circulation is in the milliampere level; When the charging ring flow valuve is less than several MAHs, now the voltage of system total voltage and this battery pack equates circulation control and protection module BHC auto-closing contactor substantially; When this group has electric discharge circulation, circulation control and protection also auto-closing main contactor, for the inversion electric discharge, meets inversion module zero millisecond switching.
CN 201320372859 2013-06-26 2013-06-26 Lithium cell automatic circulating current control and protecting circuit for energy storage power station Active CN203368009U (en)

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Application Number Priority Date Filing Date Title
CN 201320372859 CN203368009U (en) 2013-06-26 2013-06-26 Lithium cell automatic circulating current control and protecting circuit for energy storage power station

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103354377A (en) * 2013-06-26 2013-10-16 安徽力高新能源技术有限公司 Automatic circulation control and protection circuit for lithium battery of energy storage power station
CN106233568A (en) * 2015-03-10 2016-12-14 华为技术有限公司 A kind of charger is from ring detection method and device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103354377A (en) * 2013-06-26 2013-10-16 安徽力高新能源技术有限公司 Automatic circulation control and protection circuit for lithium battery of energy storage power station
CN103354377B (en) * 2013-06-26 2016-05-04 安徽力高新能源技术有限公司 A kind of energy-accumulating power station lithium battery automatic ring current control and holding circuit
CN106233568A (en) * 2015-03-10 2016-12-14 华为技术有限公司 A kind of charger is from ring detection method and device
CN106233568B (en) * 2015-03-10 2019-08-16 华为技术有限公司 A kind of charging equipment is from ring detection method and device
US10742057B2 (en) 2015-03-10 2020-08-11 Huawei Technologies Co., Ltd. Self-loop detection method and apparatus for charging device

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CP03 Change of name, title or address

Address after: Room 501, No. 8, No. 300, Changjiang Road, Yantai Economic and Technological Development Zone, Shandong Province

Patentee after: LIGO (Shandong) New Energy Technology Co., Ltd

Address before: 230088, building C2, Hefei University of science and technology, 800 Wangjiang West Road, Hefei hi tech Zone, Anhui 1-4, China

Patentee before: ANHUI LIGOO NEW ENERGY TECHNOLOGY Co.,Ltd.

CP03 Change of name, title or address