CN201829581U - Lithium battery group lossless equalizing device based on relay switching - Google Patents
Lithium battery group lossless equalizing device based on relay switching Download PDFInfo
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- CN201829581U CN201829581U CN2010202761269U CN201020276126U CN201829581U CN 201829581 U CN201829581 U CN 201829581U CN 2010202761269 U CN2010202761269 U CN 2010202761269U CN 201020276126 U CN201020276126 U CN 201020276126U CN 201829581 U CN201829581 U CN 201829581U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a lithium battery group lossless equalizing device based on relay switching, which belongs to the technical field of battery protection, and is characterized by being large in equalizing current, short in equalizing time and high in equalizing efficiency. The lithium battery group lossless equalizing device comprises a battery group in serial connection or parallel connection, a DC (direct-current)/DC conversion unit, a plurality of double-blade relays and a detection control unit, wherein the input end of the DC/DC conversion unit is connected with the anode and the cathode of the battery group, and the output end is provided with a path of isolated direct-current power supply; one ends of normally open contacts of the double-blade relays are respectively connected on the anode and the cathode of the output end of the DC/DC conversion unit in parallel, and the normally open contacts of the other ends are correspondingly connected on the anode and the cathode of each single battery in the battery group respectively; and the anode and the cathode of each single battery in the battery group are respectively connected with the detection control unit by a voltage detection flat cable. With the device, the good equalization of all the single batteries in the battery group is ensured.
Description
Technical field
The utility model relates to a kind of lithium battery pack non-dissipative equalizing device that switches based on relay, belongs to the battery protection technical field.
Background technology
The dynamic lithium battery group in the application of electric automobile, large-scale back-up source more and more widely in recent years, the dynamic lithium battery group is generally carried out series and parallel by the more piece cell and is formed, if the untimely equilibrium treatment of carrying out of the conforming difference of battery itself, in use difference is increasing in meeting, finally causes the entire cell pool-size seriously to be decayed.
Battery pack balancing device is exactly to make that by external circuit the consistency difference of cell can dynamically be adjusted in the battery pack, safeguards the harmony between cell.Modal method is bypass resistance in parallel at the battery two ends, the break-make of coming controlling resistance by a switch, when differing greatly between battery, the voltage difference that shows as cell is bigger, choose the higher partial monosomy battery of voltage, can its energy be discharged a part by control switch conducting bypass resistance, finally make each cell between voltage difference maintain in the reasonable range.Because unnecessary electric weight is consumed in vain by bypass resistance, so cause the waste of the energy content of battery, conductive discharge can produce bigger heat, so adopt the euqalizing current of this mode also less.
The utility model content
The purpose of this utility model is intended to overcome the deficiency of prior art, provides a kind of euqalizing current big, and time for balance is short, the lithium battery pack non-dissipative equalizing device based on the relay switching that balanced efficient is high.
Its technical scheme is: a kind of battery pack non-dissipative equalizing device that switches based on relay comprises series battery, DC unit, a plurality of balanced control relays and detection control unit; It is characterized in that: described DC unit input is connected with the battery pack both positive and negative polarity, and its output is one tunnel DC power supply of isolating; Two common port contacts of described balanced control relay are connected in parallel respectively on the both positive and negative polarity of DC unit output, and its Chang Kaiduan contact is corresponding respectively to be connected on the both positive and negative polarity of each cell in the battery pack; The both positive and negative polarity of each cell is inserted by the voltage detecting winding displacement respectively and detects control unit in the battery pack.
Detecting control unit is made up of batteries monomer voltage collection circuit and control relay circuit; The monomer voltage testing circuit is made of relay switching matrix and A/D converting unit, and the relay switching matrix adopts N to select 1 matrix; Two common port contacts of each two keys relay in the matrix are connected on the both positive and negative polarity of each cell in the battery pack by voltage detecting winding displacement correspondence respectively, and its normal-closed end contact is unsettled, and the Chang Kaiduan contact is parallel to respectively on the input of A/D converting unit; Control relay circuit is made of the MCU single-chip microcomputer, and the input of MCU single-chip microcomputer is connected with the output of A/D converting unit, and the control signal of a relay matrix is selected in its output output to each balanced control relay and N.
Its technique effect is: the utility model is by the collection of MCU single-chip microcomputer to each monomer battery voltage of battery pack, obtain the position of the minimum battery of voltage, when the pressure reduction of the minimum battery of this voltage and other batteries during greater than the balanced threshold pressure differential set, the MCU single-chip microcomputer promptly outputs a control signal to the balanced control relay corresponding with the minimum battery of this voltage, make this two keys relay adhesive, its contact switch closure, thereby connect the output of DC unit, begin this battery is charged, the pressure reduction of this battery and other batteries is reduced; The pressure reduction that records this battery and other batteries by the batteries monomer voltage collection circuit when the MCU single-chip microcomputer is during less than the balanced threshold pressure differential set, the MCU single-chip microcomputer promptly cuts off the control signal of this two keys relay, the contact of this two keys relay is disconnected, thereby finish independent charging this battery.Said process continues to carry out, thereby makes the pressure reduction of interior each cell of battery pack can both be controlled in the small range, and promptly each cell keeps well harmonious in the battery pack.
Compared with prior art, the beneficial effects of the utility model are embodied in:
1, unnecessary electric weight is transferred to the lower battery of electric weight in the balancing procedure, has avoided unnecessary waste of electric quantity.
2, there is not the resistance heating problem in balancing procedure.
3, euqalizing current is big, makes time for balance shorten, and balanced efficient improves.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present utility model;
Fig. 2 detects the control unit electrical schematic diagram;
Fig. 3 is a control flow chart of the present utility model.
Embodiment
As shown in Figure 1, a kind of battery pack non-dissipative equalizing device that switches based on relay adopts series connected battery group, DC unit, a plurality of two keys relay and detection control unit.DC unit (DC/DC) input is connected with In-with cell BT1～BTn series battery both positive and negative polarity In+, and its output is one tunnel DC power supply Out+ and the Out-that isolates.Is can be to the DC power supply of cell charging by dc-dc conversion with the voltage transitions of battery pack.The common port contact of balanced control relay BR1-BRn is connected in parallel respectively on the both positive and negative polarity of DC unit output, and its Chang Kaiduan contact is corresponding respectively to be connected on the both positive and negative polarity of each cell in the battery pack; The both positive and negative polarity of each cell is inserted by the voltage detecting winding displacement respectively and detects control unit in the battery pack.
As shown in Figure 2, detecting control unit is made up of batteries monomer voltage collection circuit and control relay circuit.The monomer voltage testing circuit is made of relay switching matrix and A/D converting unit, and the relay switching matrix adopts N to select 1 matrix; Two the common port contacts of two keys relay VR1～VRn in the matrix are connected on the both positive and negative polarity of each cell in the battery pack by voltage detecting winding displacement correspondence respectively, its normal-closed end contact is unsettled, and the Chang Kaiduan contact is parallel to respectively on the input of A/D converting unit; Control relay circuit is made of the MCU single-chip microcomputer, and the input of MCU single-chip microcomputer is connected with the output of A/D converting unit, and the control signal of a relay matrix is selected in its output output to each balanced control relay BR1-BRn and N.
Its course of work: the MCU single-chip microcomputer is according to the instruction of setting, and the N in the monomer voltage testing circuit selects a matrix one by one the voltage of each cell in the battery pack to be discharged on voltage bus V+ and the V-, is converted to the voltage of each cell according to A/D.When for example measuring the BT1 both end voltage, the normally opened contact adhesive of VR1 relay, the normally opened contact of other relays disconnects, and guarantees that V+ is connected to the positive pole of BT1, and V-connects the negative pole of BT1.When measuring the BT2 both end voltage, the normally opened contact adhesive of VR2 relay, the normally opened contact of other relays disconnects, and guarantees that V+ is connected to the positive pole of BT2, and V-connects the negative pole of BT2.V+, the A/D converting unit that V-connects can be according to V+, and the voltage difference of V-is carried out the voltage that digital-to-analogue conversion obtains the battery two ends.The A/D converting unit is delivered to the MCU single-chip microcomputer with transformation result, and MCU outputs control signals to RC1～RCn by relatively calculating, to control the closed and disconnected of the balanced control relay normally opened contact that is connected with the DC unit.
The following (see figure 3) of the balanced control flow of MCU single-chip microcomputer:
1, the MCU single-chip microcomputer judges whether battery pack needs to open balanced, be whether pressure reduction between cell open threshold value greater than the equilibrium of setting, if pressure reduction, shows better harmonious between cell less than threshold value, equilibrium need not be opened, and continues to return the detection monomer battery voltage.If cell pressure reduction, shows harmonious bad between cell greater than threshold value, need to start balanced.
2, the startup balancing procedure is as follows: the MCU single-chip microcomputer finds the minimum cell of voltage, promptly output a control signal to and the corresponding two keys relay of the minimum battery of this voltage, make this two keys relay adhesive, its contact switch closure, connect the output of DC unit, this battery is charged, and other two keys relay keeps disconnecting.
3, the balanced back of opening continues to detect monomer battery voltage, continues if cell pressure reduction, then forwards flow process 2 to greater than threshold value.If cell pressure reduction, then illustrates battery balanced property less than threshold value within the acceptable range, close equilibrium, forward flow process 1 to and continue to carry out.
Claims (2)
1. a battery pack non-dissipative equalizing device that switches based on relay comprises series battery, DC unit, a plurality of balanced control relays and detection control unit; It is characterized in that: described DC unit input is connected with the battery pack both positive and negative polarity, and its output is one tunnel DC power supply of isolating; Two common port contacts of described balanced control relay are connected in parallel respectively on the both positive and negative polarity of DC unit output, and its Chang Kaiduan contact is corresponding respectively to be connected on the both positive and negative polarity of each cell in the battery pack; The both positive and negative polarity of each cell is inserted by the voltage detecting winding displacement respectively and detects control unit in the battery pack.
2. a kind of battery pack non-dissipative equalizing device that switches based on relay according to claim 1, it is characterized in that: described detection control unit is made up of batteries monomer voltage collection circuit and control relay circuit; The monomer voltage testing circuit is made of relay switching matrix and A/D converting unit, and the relay switching matrix adopts N to select 1 matrix; Two common port contacts of each two keys relay in the matrix are connected on the both positive and negative polarity of each cell in the battery pack by voltage detecting winding displacement correspondence respectively, and its normal-closed end contact is unsettled, and the Chang Kaiduan contact is parallel to respectively on the input of A/D converting unit; Control relay circuit is made of the MCU single-chip microcomputer, and the input of MCU single-chip microcomputer is connected with the output of A/D converting unit, and the control signal of a relay matrix is selected in its output output to each balanced control relay and N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202761269U CN201829581U (en) | 2010-07-27 | 2010-07-27 | Lithium battery group lossless equalizing device based on relay switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202761269U CN201829581U (en) | 2010-07-27 | 2010-07-27 | Lithium battery group lossless equalizing device based on relay switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201829581U true CN201829581U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202761269U Expired - Fee Related CN201829581U (en) | 2010-07-27 | 2010-07-27 | Lithium battery group lossless equalizing device based on relay switching |
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| Country | Link |
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| CN (1) | CN201829581U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917034A (en) * | 2010-07-27 | 2010-12-15 | 合肥西玛科电子有限公司 | Relay switching-based lithium battery pack non-dissipative equalizing device |
| CN102231555A (en) * | 2011-07-15 | 2011-11-02 | 安徽省高程电子科技有限公司 | Energy recovery management system of electromobile battery pack and management method thereof |
| CN102904296A (en) * | 2012-08-03 | 2013-01-30 | 安徽力高新能源技术有限公司 | Two-way no-wear equalization circuit based on normal shock DC (Direct Current) /DC convertor |
-
2010
- 2010-07-27 CN CN2010202761269U patent/CN201829581U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917034A (en) * | 2010-07-27 | 2010-12-15 | 合肥西玛科电子有限公司 | Relay switching-based lithium battery pack non-dissipative equalizing device |
| CN102231555A (en) * | 2011-07-15 | 2011-11-02 | 安徽省高程电子科技有限公司 | Energy recovery management system of electromobile battery pack and management method thereof |
| CN102904296A (en) * | 2012-08-03 | 2013-01-30 | 安徽力高新能源技术有限公司 | Two-way no-wear equalization circuit based on normal shock DC (Direct Current) /DC convertor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20120727 |