CN202488173U

CN202488173U - Discharge-type battery management device

Info

Publication number: CN202488173U
Application number: CN2012200401272U
Authority: CN
Inventors: 李佳原; 皮尔珍贝尼
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-08
Filing date: 2012-02-08
Publication date: 2012-10-10
Anticipated expiration: 2022-02-08

Abstract

The utility model relates to a discharge-type battery management device which is characterized in that a monitor module is used for monitoring a plurality of battery units, and when the potential, current and temperature of the plurality of battery units change, a control module is used for controlling a plurality of isolated energy storage modules so as to discharge at least one of the battery units, which is at a relatively high potential, while charging the battery pack, thereby balancing the overall potential of the battery pack and increasing the energy conversion efficiency of the device..

Description

Discharge type battery management device

Technical field

The utility model is the technical field that belongs to electric energy conversion adjusting device; Particularly about a kind of utilize control module control charge and discharge switch with through energy-storage module independently simultaneously to the battery unit discharge of at least one tool high potential, to reach the discharge type battery management devices and methods therefor that waits each battery cell potential of change.

Background technology

At present; Green traffic such as electric motor car or oily electric hybrid vehicle facility are to adopt lithium Fe battery as the kinetic energy supply battery pack that can repeat to discharge and recharge in a large number; Again because the voltage of single lithium Fe battery generally is about 3～4 volts; Be not enough to electric motor car far away or oily electric hybrid vehicle is required up to the driving voltage more than 100 volts, therefore, its kinetic energy supply battery pack certainly will be formed by a plurality of lithium Fe battery units in series.Yet; The convention speech; Originally promptly have property difference slightly between each battery unit, for example internal resistance is different and cause the electric energy difference that can hold and export when discharging and recharging, has a voltage difference between each battery unit through making after the repeated charge repeatedly again; Cause the current potential of each battery unit uneven, reduce the effectiveness of performance of battery pack.Again, if battery cell potential when too high, will speed up cell degradation or burns, otherwise, if then cause cell degradation to damage during hypopotenia.

For addressing the above problem; In prior art, can adopt the mode that has a battery unit of higher levels of electrical power with the bypass resistance coupled in parallel to consume unnecessary electric energy and the current potential of balanced each battery unit; Change modes such as right this kind passive type cell potential will produce heat because of the resistance power consumption, cause the battery pack temperature rising and shorten useful life, reduction energy conversion efficiency and difficult the expansion.Again or, conversion equipments such as inductance capable of using or transformer are passed to the unnecessary electric energy of battery unit in other battery units, see also Fig. 1, it is the circuit diagram of existing active battery current potential equalizing apparatus.As shown in the figure; Said battery management device 1 is the charge-discharge circuit that is independent of a battery pack 2; Utilize a transformer 10 as energy transfer element; And its primary side couples a control module 12 after being connected in series one first switch 11, and its secondary side then couples a plurality of battery units 20 respectively through a plurality of second switches 13, and said a plurality of second switch 13 receives said control module 12 controls.When detecting, a detection module 14 realizes wherein an appearance potential, voltage or the temperature anomaly of said a plurality of battery unit 20 and need adjust the time; Said first switch 11 of said control module 12 conductings; Make the electric energy of said battery pack 2 be sent to the primary side of said transformer 10; Behind a turn-on cycle; Said control module 12 makes said a plurality of second switches 13 that said first switch 11 cuts out and the conducting tool is corresponding than the said battery unit of electronegative potential 20, with by the secondary side of said transformer 10 with electric energy store up into and each said battery unit 20 current potential such as gradeization.Hence one can see that, though but the current potential of 20 of each battery units of said method balance be additional to extra switch on the charging circuit and will make circuit structure too complicated and increase circuit cost; Moreover this method is after making said battery pack 2 whole discharges, electric energy to be sent in the lower battery unit of current potential 20; So; In case have any said battery unit 20 of adjustment that needs to exist, then all said a plurality of battery units 20 all need discharge, and cause the low and acceleration cell degradation of charge efficiency.

Summary of the invention

Because prior art problems, the purpose of the utility model is to provide a kind of discharge type battery management device, discharges and the current potential of each battery unit such as gradeization separately to be made battery unit by a plurality of energy-storage modules.

For reaching above-mentioned purpose; The discharge type battery management device of the utility model is to be suitable for a plurality of battery units that utilize the battery pack that power supply charges with monitoring; And through the stored electric fluxs of each said battery unit of change such as mode of independent discharge, it comprises a plurality of energy-storage modules, a monitoring modular and a control module.Said a plurality of energy-storage module couples power supply and said battery pack; Each said energy-storage module comprises one first coil, a magnetic core and one second coil; And each said first coil is by said magnetic core said second coil that is coupled, and each said second coil couples said battery unit through one first switch.Said monitoring modular is to electrically connect said a plurality of battery units; Monitor current potential, electric current and the temperature of said a plurality of battery units; And compare the potential balance state of said a plurality of battery units; When said a plurality of battery units wherein one of at least have high potential relatively the time, said monitoring modular output one discharge signal.Said again control module couples said a plurality of energy-storage module and said monitoring modular; Said control module receives said discharge signal makes corresponding said battery unit in the time of charging, discharge electric energy to corresponding said second coil with corresponding said first switch of conducting; Mutual inductance effect through said second coil and said first coil; After making the electric energy of release be sent to corresponding said first coil, be stored in corresponding said energy-storage module, feed back to device.

Cause said battery pack to damage for avoiding said a plurality of battery unit to overcharge; Said discharge type battery management device more comprises a second switch; Be to couple power supply, said a plurality of energy-storage modules and said control module; When said monitoring modular records that the charging current of said battery pack is excessive, electrical potential energy reaches full closing or temperature when too high, export a power failure signal to said control module, make said control module close said second switch and stop the power supply power supply.Said again second switch is low-power consumption and the electronic switch that can bear operating current more than 200 amperes.

On the other hand; For avoiding said a plurality of battery unit over-discharge can to cause short circuit; Said discharge type battery management device more comprises a discharge protection module, is to couple said control module and said battery pack, and the potential state that records said a plurality of battery units when said monitoring modular is crossed when low; Export an abnormal signal to said control module, make said control module stop said battery power discharge through said discharge protection module.

Moreover; For promoting the accumulate efficient of said battery pack; Each said first coil is to couple a synchronous rectifier cell through one the 3rd switch, make said energy-storage module synchronous rectified power voltage and the said battery unit that charges, and said the 3rd switch is a mos field effect transistor.Perhaps, each said first coil is serial connection one diode, with asynchronous rectification charging electric current.

The utility model can make at least one said battery unit of the relative high potential of tool in the time of charging, discharge unnecessary electric weight and feed back to charging device, with the potential state between the said a plurality of battery units of balance.

Description of drawings

Fig. 1 is the circuit diagram of existing active battery current potential equalizing apparatus;

Fig. 2 is the calcspar that aspect is implemented in first of the utility model preferred embodiment;

Fig. 3 is the circuit diagram that aspect is implemented in first of the utility model preferred embodiment;

Fig. 4 is the circuit diagram that aspect is implemented in second of the utility model preferred embodiment.

Description of reference numerals: 1-battery management device; The 10-transformer; 11-first switch; The 12-control module; The 13-second switch; The 14-detection module; The 2-battery pack; The 20-battery unit; 3-discharge type battery management device; The 30-energy-storage module; 301-first coil; The 302-magnetic core; 303-second coil; 304-first switch; 305-the 3rd switch; The 31-monitoring modular; The 32-control module; The 33-second switch; The 34-protection module that discharges; 35-synchronous rectification element; The 4-battery pack; The 40-battery unit.

Embodiment

For making your juror can know the content of understanding the utility model, sincerely graphic with the description collocation, please consult.

See also Fig. 2～Fig. 4, it is respectively the circuit signal that the calcspar of aspect, circuit signal and the second enforcement aspect are implemented in first of the utility model preferred embodiment.As shown in the figure, said discharge type battery management device 3 is in order to charging and monitors a plurality of battery units 40 of said battery pack 4, and it comprises a plurality of energy-storage module 30, a monitoring modular 31, a control module 32, a second switch 33 and a discharge protection module 34.Each said energy-storage module 30 comprises one first coil 301, a magnetic core 302 and one second coil 303; Each said first coil 301 is by said second coil 303 of said magnetic core 302 couplings, and each said second coil 303 couples said battery unit 40 through one first switch 304.Said monitoring modular 31 electrically connects said a plurality of battery units 40 and said control module 32.Said control module 32 couples first switch 304, and is in holding state at ordinary times, only records unusual and starts when sending signal in said monitoring modular 31, to save stand-by power consumption.Said second switch 33 is coupled to 32 of power supply, said a plurality of energy-storage modules 30 and said control modules, and said discharge protection module 34 then couples said control module 32 and said battery pack 4.

Current potential, electric current and the temperature of the said a plurality of battery units 40 of said monitoring modular 31 monitorings; With detect said a plurality of battery unit 40 whether not excess temperature, overcurrent or current potential are not crossed low and exportable discharging current? If; Open the discharging function of said battery unit 40 through said control module 32, otherwise then close discharging function.Then, when excessive or temperature was too high when the charging current of said battery pack 4, whether the potential state of the said a plurality of battery units 40 of said monitoring modular 31 comparisons had reached the full state that closes, if a certain said battery unit 40 _-1Institute's accumulate can be greater than a maximum power value; For example 3.65 volts the time; Promptly export a power failure signal and a discharge signal to said control module 32; Make said control module 32 close said second switch 33 and stop power supply input, overcharge to avoid input exception error to occur or burn said battery pack 4.Simultaneously, corresponding said first switch 304 of said control module 32 conductings _-1And make corresponding said battery unit 40 _-1In the time of charging, discharge unnecessary electric energy to corresponding said second coil 303 _-1With the mutual inductance effect of said first coil 301 electric energy that discharges is sent to corresponding said first coil 301 by said second coil 303 again _-1And be temporary in corresponding said a plurality of energy-storage modules 30 _-1In and feed back to device.It should be noted that; Said second switch 33 is low-power consumption and the electronic switch that can bear operating current more than 200 amperes; Avoiding device switching on and shutting down moments to produce spark and to damage circuit, and its full load total power consumption is lower than 50 watts and then helps power saving, meets the environmental protection demand.

Otherwise; If there is not said battery unit 40 greater than 3.65 volts; Whether the potential errors amounts that said monitoring modular 31 is further judged each said battery unit 40 less than an error preset value, and for example positive and negative 0.05 volt, if; Then detect said battery unit 40 once more and whether just carrying out charge or discharge, to continue the said a plurality of battery units 40 of monitoring or to finish monitoring results.If the potential errors amount of each said battery unit 40 is greater than positive and negative 0.05 volt, then send said discharge signal to said control module 32 again, to open corresponding said second-class

first switch

304 _-2, 304 _-nMake said second-class battery unit 40 greater than said battery pack 4 current potential mean values _-2, 40 _-nDischarge electric energy to corresponding said second-class

second coil

303 _-2, 303 _-nAfter, through said second-class first coil 301 of correspondence _-2, 301 _-nThe electric energy that discharges is temporary in corresponding said second-class energy-

storage module

30 _-2, 30 _-nIn, feed back to device.So; But do not waste the current potential of 40 of the said a plurality of battery units of electric energy and quick equating; Promote the charge efficiency of said battery pack 4; Be applied to big electric current can be used as, for example connect 40 to 384 volts of said a plurality of battery units and form the active potential balancing apparatus in said battery pack 4 charging/discharging apparatus of high pressure.

And; The potential state that records said a plurality of battery unit 40 when said monitoring modular 31 is crossed when low; Export an abnormal signal to said control module 32; Make said control module 32 stop said battery pack 4 discharges, cause aged deterioration to avoid said a plurality of battery unit 40 over-discharge can through said discharge protection module 34.So, said discharge type battery management device 3 can carry out perfect protection through said monitoring modular 31, said

second switch

33 and 34 pairs of said battery pack 4 of said discharge protection module.

Moreover each said first coil 301 is asynchronous rectifier cells that serial connection can be diode, adjustment charge cycle in the time of with the filter rectification charging current.Or further; Couple a synchronous rectifier cell 35 after making each said first coil 301 be connected in series one the 3rd switch 305 that can be mos field effect transistor; When said the 3rd switch 305 conductings; Said energy-storage module 30 is with synchronous rectified power voltage and the said a plurality of battery unit 40 that charges reaches more than 70% to enhance energy conversion efficiency.

The above is merely the preferred embodiment of illustrative, but not is restricted person.Any spirit and category that does not break away from the utility model, and to its equivalent modifications of carrying out or change, all should be contained in the accompanying claim.

Claims

1. a discharge type battery management device is characterized in that, be to be suitable for a plurality of battery units that utilize the battery pack that power supply charges with monitoring, and through stored electric flux such as independent discharge each said battery unit such as grade, it comprises:

A plurality of energy-storage modules; Be to couple power supply and said battery pack; Each said energy-storage module comprises one first coil, magnetic core and one second coil, and each said first coil is by said magnetic core said second coil that is coupled, and each said second coil couples said battery unit through one first switch;

One monitoring modular; Be to electrically connect said a plurality of battery units; Monitor current potential, electric current and the temperature of said a plurality of battery units; And compare the potential balance state of said a plurality of battery units, when said a plurality of battery units wherein one of at least have high potential relatively the time, said monitoring modular output one discharge signal; And

One control module; Be to couple said a plurality of energy-storage module and said monitoring modular; Said control module receives said discharge signal makes corresponding said battery unit in the time of charging, discharge electric energy to corresponding said second coil with corresponding said first switch of conducting, through the mutual inductance effect of said second coil and said first coil, make the electric energy of release be sent to said first coil of correspondence after; Be stored in corresponding said energy-storage module, feed back to device.

2. discharge type battery management device according to claim 1; It is characterized in that; More comprising a second switch, is to couple power supply, said a plurality of energy-storage modules and said control module, when said monitoring modular records that the charging current of said battery pack is excessive, electrical potential energy reaches full closing or temperature when too high; Export a power failure signal to said control module, make said control module close said second switch and stop power supply and supply power.

3. discharge type battery management device according to claim 2 is characterized in that, said second switch is low-power consumption and the electronic switch that can bear operating current more than 200 amperes.

4. discharge type battery management device according to claim 1; It is characterized in that; More comprising a discharge protection module, is to couple said control module and said battery pack, and the potential state that records said a plurality of battery units when said monitoring modular is crossed when low; Export an abnormal signal to said control module, said control module is stopped said battery power discharge through said discharge protection module.

5. discharge type battery management device according to claim 1 is characterized in that, each said first coil is to couple a synchronous rectifier cell through one the 3rd switch, makes said energy-storage module synchronous rectified power voltage and the said battery unit that charges.

6. discharge type battery management device according to claim 5 is characterized in that said the 3rd switch is a mos field effect transistor.

7. discharge type battery management device according to claim 1 is characterized in that, each said first coil is serial connection one diode, with asynchronous rectification charging electric current.