CN202333888U - Balanced charging device for serial-connected lithium batteries - Google Patents
Balanced charging device for serial-connected lithium batteries Download PDFInfo
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- CN202333888U CN202333888U CN2011204733145U CN201120473314U CN202333888U CN 202333888 U CN202333888 U CN 202333888U CN 2011204733145 U CN2011204733145 U CN 2011204733145U CN 201120473314 U CN201120473314 U CN 201120473314U CN 202333888 U CN202333888 U CN 202333888U
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Abstract
The utility model provides a balanced charging device for serial-connected lithium batteries, relating to a battery charging device. The utility model provides the balanced charging device for the serial-connected lithium batteries, which introduces a public energy pool structure and can solve the balance problem of the serial-connected lithium batteries well. The balanced charging device is provided with a multi-coil transformer, an energy converting circuit, a voltage detecting circuit and a control unit, wherein the energy converting circuit is connected with a coil group of the multi-coil transformer and the both ends of each single battery of a serial-connected battery group respectively; the control signal input end of the energy converting circuit is connected with the control signal output end of the control unit; the detecting voltage input end of the voltage detecting circuit is connected in parallel with the both ends of the single battery of the serial-connected battery group; and the detecting voltage output end of the voltage detecting circuit is connected with the detecting voltage input end of the control unit.
Description
Technical field
The utility model relates to a kind of battery charger, especially relates to a kind of serial lithium battery balanced charging device.
Background technology
Because lithium ion battery has energy density height, long service life, voltage advantages of higher, therefore synthesize first-selected object and receive much attention in accumulation power supply electrical property, reliability, the higher field of security requirement.The lithium battery monomer voltage is about 3～4V; For satisfying the demand of high power vehicle; Power accumulator must be connected cell, but because chemical condition maybe be different between each battery cell, has difference like parameters such as the voltage of battery, internal resistance, capacity, charge acceptance, cycle lives; Carrying out charge and discharge cycles repeatedly also can make this species diversity constantly worsen; Finally cause between each battery of series connection capacity and voltage seriously inconsistent, thereby influence the performance and the capacity of whole series battery, cause battery life seriously to detract.Equilibrium problem between the series battery cell becomes restriction dynamic lithium battery development key technology.
At present, general balance policy has two kinds: the balanced and non-energy consumption formula of energy consumption formula is balanced, and the equilibrium of wherein non-energy consumption formula comprises energy transfer type and energy conversion type again.The control of energy consumption formula equalization methods is simple, but needs powerful resistance, big current power switch, and energy consumption is big, needs auxiliary annealing device.The balance control method of non-energy consumption formula, no matter be transfer type or change type, control switch quantity is many, electric current and voltage stress are big, control logic complicacy.A kind of battery equalizing circuit is disclosed in Chinese invention patent application CN1275829A; It need not measure the voltage of each battery; But the battery pack that two adjacent series-connected cells constitute is carried out equilibrium, and between two batteries, connect switching circuit, between the common node of battery and switching circuit, be connected a resonant circuit; Alternately make resonant circuit parallelly connected by switching circuit with first and second batteries; It is mobile between them as the function of charge unbalance between first and second batteries to make flip-flop pass through resonant circuit, yet its equilibrium realizes through resonant circuit; Therefore resonance coil and iron core need be set, cause the increase of equalizing circuit weight and volume.In view of the foregoing, also there is not desirable series battery balancing technique actually to use at present.
Summary of the invention
The purpose of the utility model is to provide a kind of introducing public energy pool structure to the above-mentioned shortcoming of existing serial lithium battery group equalization methods existence, can solve the serial lithium battery balanced charging device of serial lithium battery group equalization problem preferably.
The utility model is provided with multi-thread coil transformer, power conversion circuits, voltage detecting circuit and control unit; Said power conversion circuits is connected with the coil groups of multi-thread coil transformer and each cell two ends of series battery respectively, and the signal input end of power conversion circuits is connected with the control signal output ends of control unit; The detection voltage input end of said voltage detecting circuit is attempted by the cell two ends of series battery, and the detection voltage output end of voltage detecting circuit connects the detection voltage input end of control unit.
Said multi-thread coil transformer is made up of iron core and 2 group coils at least, organizes between the coil to intercouple through the magnetic hinge more, forms public energy pond, a magnetic field.
Said power conversion circuits is provided with MOS switch driving circuit, rectifier diode and ballast inductance, and said MOS switch driving circuit is connected with the ballast inductance with rectifier diode; The input of said MOS switch driving circuit is connected with the control signal output ends of control unit.
Said power conversion circuits cooperates with multi-thread coil transformer, and the power conversion in the cell that energy is high becomes magnetic field energy to exist in the public energy pond, also with the magnetic field energy in the public energy pond, converts electric field energy to and injects the low cell of energy.
Said voltage detection unit is used for monomer battery voltage is detected, and is used for as the foundation of judging cell energy height.
Said control unit is made up of microprocessor and logical circuit, and microprocessor is connected with logical circuit, is used for overall situation control.
The public energy pond, magnetic field that the utility model constitutes based on multi-thread coil transformer; Adopted the cell power conversion that energy is high to become magnetic field energy; Be stored in the public energy pond, magnetic field, convert the magnetic field energy in the public energy pond, magnetic field to electric field energy simultaneously and inject the low cell of energy.It is many that this has solved the switch element that exists in the common non-energy consumption type balancing technique, the problem that transformer is many.
The utility model adopts the balanced control technology of energy common pool formula, and so-called public energy pond is the public magnetic field energy pond that constitutes a storage tape energy with many coil groups transformer.The equilibrium charging rotary device comprises that multi-thread coil transformer, power conversion circuits, voltage detecting circuit and control unit constitute.After the respective coil group is connected in power conversion circuits and the multi-thread coil transformer, be connected to corresponding cell two ends, voltage detecting circuit is attempted by the cell two ends, and control unit is connected with voltage detecting circuit and MOS switch driving circuit.
Description of drawings
Fig. 1 is the structure composition frame chart of the utility model embodiment.
Fig. 2 is the circuit theory sketch map of the utility model embodiment.
Fig. 3 is balanced unit and the drive circuit principle schematic of the utility model embodiment.
Fig. 4 is the voltage detecting circuit principle schematic of the utility model embodiment.
In the drawings, respectively be labeled as: 1 is multi-thread coil transformer, and D1, D2...Dn are rectifier diode, and L1, L2...Ln are the ballast inductance, and Q1, Q2...Qn form switching circuit, and B1, B2...Bn form series battery.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Referring to Fig. 1, the utility model embodiment is provided with multi-thread coil transformer 1, power conversion circuits 2, voltage detecting circuit 3 and control unit 4; Said power conversion circuits 2 is connected with the coil groups of multi-thread coil transformer 1 and each cell two ends of series battery 5 respectively, and the signal input end of power conversion circuits 1 is connected with the control signal output ends of control unit 4; The detection voltage input end of said voltage detecting circuit 3 is attempted by the cell two ends of series battery 5, and the detection voltage output end of voltage detecting circuit 3 connects the detection voltage input end of control unit 4.
Said multi-thread coil transformer 1 is made up of iron core and 2 group coils at least, organizes between the coil to intercouple through the magnetic hinge more, forms public energy pond, a magnetic field.
Said power conversion circuits 2 is provided with MOS switch driving circuit, rectifier diode and ballast inductance, and said MOS switch driving circuit is connected with the ballast inductance with rectifier diode; The input of said MOS switch driving circuit is connected with the control signal output ends of control unit.
Said power conversion circuits 2 cooperates with multi-thread coil transformer 1, and the power conversion in the cell that energy is high becomes magnetic field energy to exist in the public energy pond, also with the magnetic field energy in the public energy pond, converts electric field energy to and injects the low cell of energy.
Said voltage detection unit 3 is used for monomer battery voltage is detected, and is used for as the foundation of judging cell energy height.
Said control unit 4 is made up of microprocessor and logical circuit, and microprocessor is connected with logical circuit, is used for overall situation control.
As shown in Figure 2, power conversion circuits is made up of controlled MOS switching tube Qi and respective drive circuit A, rectifier diode Di, ballast inductance Li.Fig. 3 is balanced unit and drive circuit, and TR is for sharing the multi-thread coil transformer of formula among the figure, and PWM is the pwm signal end of AVR Single-chip Controlling output.Q1 is a switching tube; When the grid level of Q1 is the PWM driving; The balanced unit of this battery is as the shunting balanced unit, promptly the charging current of B1 shunted, and when the grid level of Q1 increase control signal not; Balanced unit is as confluxing the unit, and promptly the charging current of battery is also added the electric current from the TR transformer except former charging current.D1 is a rectifier diode in the circuit, and inductance plays the ballast effect.Circuit parameter design is following: switching tube is IRLL2705, the big current MOS FET switching tube that a kind of low-voltage starts.Optocoupler is selected high speed photo coupling 6N137, and diode selecting is Schottky diode IN5819, after the size of inductance according to the capacity decision shunting of battery or the electric current that confluxes, selects the size of inductance again, the 1/10-1/100 of general choosing and coil inductance.
Multi-thread coil transformer is a transformer that contains many group coil windings, can convert electric field energy to magnetic field energy through power conversion circuits, also can convert magnetic field energy to electric field energy.A corresponding rectifier diode Di and a switching tube Qi and the ballast inductance Li of connecting of each group coil windings, parallelly connected through rectifier diode Di, switching tube Qi and ballast inductance Li with cell Bi.When switching tube Qi works; Through coil windings will be with it the energy of cell Bi of parallel connection change magnetic field energy into and be stored in the multi-thread coil transformer; When switching tube Qi does not work; Coil windings is coupled out magnetic field energy in the multi-thread coil transformer and becomes electric field energy, injects through rectifier diode Di among the cell of parallel connection with it.The ballast inductance is electric current stably with the current transitions of pulsation.
The voltage detection unit that is connected in parallel on the cell two ends is made up of electronic devices and components such as switch arrays, amplifying circuits, detects each monomer battery voltage by it, and this voltage signal is sent to control unit.Referring to Fig. 4, CD4051 is the digital control simulant electronic switches of single 8 passages, and 2 CD4051 dislocation connect battery, and identical address is just selected the positive and negative terminal output of battery respectively, exports to amplifying circuit, and the voltage range that converts 2.5V into is imported to AD.Consider economy and practicality, the four-operational amplifier LM324 that operational amplifier is selected.The remaining circuit parameter is: resistance R 1=R2=2M Ω, R3=R4=1M Ω, R5=50 Ω; Capacitor C=0.1 μ F.
Control unit is made up of microprocessor, selects higher ATmega16 in the AVR single-chip microcomputer.It receives each monomer battery voltage signal of sending here from voltage detection unit; The energy of judging which cell is than higher; The energy of which cell is lower; See switching signal according to judged result off to drive circuit, drive the corresponding switching tube Qi in the power conversion circuits on some high cells of energy that is connected on, the power conversion of these cells is magnetic field energy and is stored in the multi-thread coil transformer.Simultaneously, remaining coil groups then is operated in the operating state that magnetic field energy is converted to electric field energy on the multi-thread coil transformer, magnetic field energy is transformed into electric field energy injects the lower cell of other energy.
Claims (3)
1. a serial lithium battery balanced charging device is characterized in that being provided with multi-thread coil transformer, power conversion circuits, voltage detecting circuit and control unit; Said power conversion circuits is connected with the coil groups of multi-thread coil transformer and each cell two ends of series battery respectively, and the signal input end of power conversion circuits is connected with the control signal output ends of control unit; The detection voltage input end of said voltage detecting circuit is attempted by the cell two ends of series battery, and the detection voltage output end of voltage detecting circuit connects the detection voltage input end of control unit.
2. a kind of serial lithium battery balanced charging device as claimed in claim 1 is characterized in that said multi-thread coil transformer is made up of iron core and 2 group coils at least, organizes between the coil to intercouple through the magnetic hinge more, forms public energy pond, a magnetic field.
3. a kind of serial lithium battery balanced charging device as claimed in claim 1; It is characterized in that said power conversion circuits is provided with MOS switch driving circuit, rectifier diode and ballast inductance, said MOS switch driving circuit is connected with the ballast inductance with rectifier diode; The input of said MOS switch driving circuit is connected with the control signal output ends of control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204733145U CN202333888U (en) | 2011-11-24 | 2011-11-24 | Balanced charging device for serial-connected lithium batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204733145U CN202333888U (en) | 2011-11-24 | 2011-11-24 | Balanced charging device for serial-connected lithium batteries |
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| Publication Number | Publication Date |
|---|---|
| CN202333888U true CN202333888U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204733145U Expired - Fee Related CN202333888U (en) | 2011-11-24 | 2011-11-24 | Balanced charging device for serial-connected lithium batteries |
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| CN (1) | CN202333888U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496976A (en) * | 2011-11-24 | 2012-06-13 | 厦门大学 | Equalization charging device of series connected lithium batteries |
| CN104009506A (en) * | 2013-02-25 | 2014-08-27 | 新普科技股份有限公司 | Bidirectional balancing circuit for battery |
-
2011
- 2011-11-24 CN CN2011204733145U patent/CN202333888U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496976A (en) * | 2011-11-24 | 2012-06-13 | 厦门大学 | Equalization charging device of series connected lithium batteries |
| CN104009506A (en) * | 2013-02-25 | 2014-08-27 | 新普科技股份有限公司 | Bidirectional balancing circuit for battery |
| CN104009506B (en) * | 2013-02-25 | 2017-06-30 | 新普科技股份有限公司 | Bidirectional balancing circuit for battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20141124 |
|
| EXPY | Termination of patent right or utility model |