CN102738843A - Serial battery energy balancing circuit - Google Patents
Serial battery energy balancing circuit Download PDFInfo
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- CN102738843A CN102738843A CN201110094545XA CN201110094545A CN102738843A CN 102738843 A CN102738843 A CN 102738843A CN 201110094545X A CN201110094545X A CN 201110094545XA CN 201110094545 A CN201110094545 A CN 201110094545A CN 102738843 A CN102738843 A CN 102738843A
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Abstract
The invention relates to a serial battery energy balancing circuit which comprises a first battery module, a second battery module, and a transformer winding. The first battery module is provided with a first single battery, a first discharging circuit, and a first charging circuit, wherein the first discharging circuit is formed by connecting a first coil and the first single battery in series, the first charging circuit comprises a second coil and a first diode and connects with the first single battery in series; and the second battery module is provided with a second single battery, a second discharging circuit, and a second charging circuit, wherein the second discharging circuit is formed by connecting the second coil and the second single battery in series, and the second charging circuit comprises a third coil and a second diode and connects with the second single battery in series; and the transformer winding is coupled to the first coil, the second coil, and the third coil. In a discharging mode, the first discharging circuit and the second discharging circuit balance energy of the first coil and the second coil via the transformer winding in order to balance the first single battery and the second single battery by discharging; while in a charging mode, energy of the second coil and the third coil is charged back into the first single battery and the second single battery.
Description
Technical field
The present invention relates to a kind of battery series connection energy balance circuit, particularly relate to a kind of many battery cells and be connected in series, and by being that the main balance module that is constituted is to reach the battery series connection energy balance circuit of each battery cell energy balance with the Transformer Winding.
Background technology
Present battery applications is in order to improve working voltage; In practical application, adopt the form of being connected in series more, in order to increase useful life and to reduce battery cell difference, so battery select just extremely important; Normally according to performance index such as cell voltage, internal resistance and capacity with cell classification; Search the high battery cell of Performance Match property (Cell) with this and form the battery pack use, along with the increase of battery charging and discharging number of times and the influence that receives degree of aging, each battery cell voltage difference opposite sex can be increasing; Arrive the over-charge protective point when causing batteries charging ahead of time; Started ahead of time during discharge and put the protection point, and caused battery pack can use capacity significantly to dwindle, following example can be explained this phenomenon.
Seeing also shown in Figure 1ly, is the circuit diagram of series battery.Battery pack is made up of three battery cells 11,12,13 that are embodied as lithium battery institute that is connected in series in this example; And three battery cells 11,12,13 are as shown in Figure 2 before also not passing through charge-discharge test here; The voltage of each battery cell 11,12,13 is all identical, and wherein Fig. 2 is the electric weight sketch map of each battery of series battery before without charge-discharge test.
Moreover; Behind discharge regime, the voltage of each battery cell 11,12,13 (hatched example areas is the variation of each battery energy after overdischarge) as shown in Figure 3, Fig. 3 are the electric weight sketch map of each battery after discharge among Fig. 2; Wherein the cell degradation degree of battery cell 12 is also faster than battery cell 11 and battery cell 13; Repeatedly using the unbalanced otherness in back obviously to increase, and because current battery protection IC is a voltage measurement mode, as long as there is the voltage of any one battery cell (like the battery cell among Fig. 3 12) to be lower than under-voltage protection point (like 2.6V among Fig. 3); Protection IC will stop all battery cells 11,12,13 and carry out discharging action; Therefore only there is a battery cell aging ahead of time, will lets whole battery group inform the information that does not have electricity ahead of time, also can let the user think that battery pack has not had electricity soon.
Moreover, see also shown in Figure 4, be among Fig. 3 each battery through the charging after the electric weight sketch map.Wherein, When the charging stage; Because the actual residual energy of battery cell 11 can reach over-charge protective point (like 4.2V among Fig. 4) than other two battery cells 12, more than 13 when therefore charging the earliest, this moment, battery protection ic started; Therefore all battery cells 11,12,13 stop charging, can let the user think that battery pack fills full soon.
Edge this, under the situation to batteries charging discharge repeatedly, energy is uneven between each battery cell causes that problem will certainly get much worse before its gets any better, under the effect of protection IC, the utilance of battery pack can be very low.
In order to address the above problem, discharge loop configuration as shown in Figure 5 is arranged at present, wherein Fig. 5 is the circuit diagram in existing convention battery discharge loop.Battery cell shown in the figure 11 is parallelly connected one group of discharge loop 14; This discharge loop 14 includes a resistance 141 and a switch 142; Each battery cell 11,12,13 of aforementioned battery pack all can this discharge loop 14 of parallel connection, by resistance 141 control with switch 142, and the voltage homogenization after making each battery cell 11,12,13 energy discharge; In practical operation; As shown in Figure 6, be datum mark (like 3.7V among Fig. 6) with the battery cell 12 of minimum energy, then battery cell 11 and battery cell 13 oblique line districts are released into and battery cell 12 equalizations; And can reach the purpose of voltage balance of battery, wherein Fig. 6 is to the discharge electric weight sketch map of balance of each battery by the circuit of Fig. 5.The balance of voltage technology of this type of passive type is to be released to the basis with energy, and in when charging, charging rate is during greater than the circuit balancing ability; Just must lower charging current, thus can elongate the charging interval, when discharge; There is not much left because of the energy content of battery, more can not start balancing circuitry, will have the battery of energy to discharge; Therefore this type of technical efficiency is low, and also has disappearances such as the heating of being prone to and energy waste.
This shows that the battery pack of the monomer series-connected composition of above-mentioned conventional battery obviously still has inconvenience and defective, and demands urgently further improving in structure and use.In order to solve the problem of above-mentioned existence; Relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly; But do not see always that for a long time suitable design is developed completion, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of battery series connection energy balance circuit of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to; Overcome the defective of the battery pack existence of the monomer series-connected composition of conventional battery; And provide a kind of battery series connection energy balance circuit of new structure, technical problem to be solved be make wherein each battery module through with the induction of Transformer Winding, be transferred to low by height and can be issued to energy to obtain the balance of each battery electric quantity at discharge mode; And can be under charge mode with Transformer Winding in electric weight be recycled to battery charge, be very suitable for practicality.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.A kind of battery series connection energy balance circuit according to the present invention's proposition; It includes one first battery module, one second battery module and a Transformer Winding; Wherein first battery module has one first battery cell, one first discharge loop and one first charge circuit; First discharge loop has one first coil and connects with first battery cell; First charge circuit then includes one second coil and one first diode connecting with first battery cell, moreover second battery module then has one second battery cell, one second discharge loop and one second charge circuit; Second discharge loop is composed in series by second coil and second battery cell; Second charge circuit then includes a tertiary coil and one second diode to connect with second battery cell, and in addition, Transformer Winding then is coupled in first coil, second coil and tertiary coil.Battery series connection energy balance circuit of the present invention is under discharge mode; First discharge loop and second discharge loop are by the energy of Transformer Winding balance first coil and second coil; And discharge balance first battery cell and second battery cell; And under charge mode, then the energy with second coil recharges to first battery cell, and the energy of tertiary coil is recharged to second battery cell.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid battery series connection energy balance circuit; Wherein said first battery module also includes one first switch; This first switch is to be connected in series with this first battery cell and this first coil, is this discharge mode during its closed communicating, and when disconnection is not communicated with, is this charge mode.
Aforesaid battery series connection energy balance circuit; Wherein said second battery module also includes a second switch; This second switch is to be connected in series with this second battery cell and this second coil, is this discharge mode during its closed communicating, and when disconnection is not communicated with, is this charge mode.
Aforesaid battery series connection energy balance circuit; Also include a plurality of battery modules; And each battery module all includes a battery cell, a discharge loop and a charge circuit; This discharge loop has a coil connects with this battery cell, and this charge circuit has another coil and a diode connecting with this battery cell, and those coils all are coupled in this Transformer Winding.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, battery series connection energy balance circuit of the present invention has advantage and beneficial effect at least: battery series connection energy balance circuit of the present invention is formed by above-mentioned circuit, and can be applicable to dissimilar batteries; Promptly need not the voltage of each battery of monitoring in equilibrium process, and can adjust the coil number, reach the effect that can infinitely expand battery module according to the number of series-connected cell; Moreover; Because the framework that the present invention shifts for energy, therefore non-energy consumption can reach that balance loss is few, efficient is high and equilibration time such as lacks at effect; And then improve the battery utilance and increase the service life, can reduce the waste of battery.
In sum, the invention relates to a kind of battery series connection energy balance circuit, it includes one first battery module, one second battery module and a Transformer Winding.Wherein first battery module has one first battery cell, one first discharge loop and one first charge circuit; First discharge loop has one first coil connects with first battery cell, and first charge circuit then includes one second coil and one first diode to connect with first battery cell; Second battery module then has one second battery cell, one second discharge loop and one second charge circuit; Second discharge loop is composed in series by second coil and second battery cell, and second charge circuit then includes a tertiary coil and one second diode to connect with second battery cell; Transformer Winding then is coupled in first coil, second coil and tertiary coil; Under discharge mode; First discharge loop and second discharge loop are by the energy of Transformer Winding balance first coil and second coil; And discharge balance first battery cell and second battery cell under charge mode, then recharge the energy of second coil to first battery cell and with the energy of tertiary coil and recharge to second battery cell.The present invention has obvious improvement technically, and has tangible good effect, really is the new design of a novelty, progress, practicality.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification, and for let of the present invention above-mentioned with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the circuit diagram of series battery.
Fig. 2 is the electric weight sketch map of each battery of series battery before without charge-discharge test.
Fig. 3 is the electric weight sketch map of each battery after discharge among Fig. 2.
Fig. 4 is the electric weight sketch map of each battery after charging among Fig. 3.
Fig. 5 is the circuit diagram in existing convention battery discharge loop.
Fig. 6 is to the discharge electric weight sketch map of balance of each battery by the circuit of Fig. 5.
Fig. 7 is the circuit diagram of the battery series connection energy balance circuit of preferred embodiment of the present invention.
Fig. 8 is the electric quantity balancing sequential chart of the battery series connection energy balance circuit of preferred embodiment of the present invention.
Fig. 9 is the circuit diagram of the battery series connection energy balance circuit of another preferred embodiment of the present invention.
11: battery cell 12: battery cell
13: battery cell 14: discharge loop
141: resistance 142: switch
21: the first battery cells of 20: the first battery modules
23: the first diodes of 22: the first coils
30: the second battery modules of 25: the first switches
32: the second coils of 31: the second battery cells
Diode 34 in 33: the second: tertiary coil
35: second switch 40: Transformer Winding
50: battery module
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; To its embodiment of battery series connection energy balance circuit, structure, characteristic and the effect thereof that proposes according to the present invention, specify as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to appear in the following detailed description that cooperates with reference to graphic preferred embodiment.Explanation through embodiment; Should be to reach technological means that predetermined purpose takes and effect to obtain one more deeply and concrete understanding to the present invention; Yet the appended graphic usefulness that only provides reference and explanation is not to be used for the present invention is limited.
Seeing also shown in Figure 7ly, is the circuit diagram of the battery series connection energy balance circuit of preferred embodiment of the present invention.Battery of the present invention series connection energy balance circuit shown in the figure includes one first battery module 20, one second battery module 30 and a Transformer Winding 40; Wherein first battery module 20 has one first battery cell 21, one first discharge loop and one first charge circuit; First discharge loop has one first coil 22 and connects with first battery cell 21; First charge circuit then includes one second coil 32 and one first diode 23 to connect with first battery cell 21; 30 of second battery modules have one second battery cell 31, one second discharge loop and one second charge circuit; Second discharge loop has second coil 32 and connects with second battery cell 31; Second charge circuit then includes a tertiary coil 34 and one second diode 33 is connected with second battery cell 31, and Transformer Winding 40 is coupling first coil 22, second coil 32 and tertiary coil 34, under a discharge mode; First discharge loop and second discharge loop system are by the energy of Transformer Winding 40 balances, first coil 22 and second coil 32; And discharge balance first battery cell 21 and second battery cell 31 and under a charge mode, recharge the energy of second coil 32 to first battery cell 21 and with the energy of tertiary coil 34 and recharge to second battery cell 31.
Moreover; Has one first switch 25 in the middle of also having disclosed first battery module 20 among Fig. 7; And first switch 25 is to be connected in series with first battery cell 21 and first coil 22; And second battery module 30 also has a second switch 35; First switch 25 and second switch 35 are discharge mode when closed communicating, this moment first, battery cell 21, first coil 22 and first switch 25 formed a loop, and second battery cell 31, second coil 32 and second switch 35 form a loop; This moment, the battery current of first battery cell 21 and second battery cell 31 got into first coil 22 and second coil 32 respectively with the generation exciting curent; And by Transformer Winding 40 equilibrium response unshakable in one's determination, energy is transferred to by height low, with making that the higher battery cell of voltage discharges to reach balance the lower battery of voltage in two battery cells 21,31.
Moreover; When first switch 25 and second switch 35 are charge mode breaking off when not being communicated with; This moment first, battery cell 21, first diode 23 and second coil 32 formed a loop; And second battery cell 31, second diode 33 and tertiary coil 34 also form a loop, and the energy that stay second coil 32 and tertiary coil 34 this moment charges into to first battery cell 21 and second battery cell 31 through first diode 23 and second diode 33 respectively.
Seeing also shown in Figure 8ly, is the electric quantity balancing sequential chart under above-mentioned discharge mode to the charge mode.As shown in the figure; When first switch 25 and second switch 35 during at closed communicating (discharge mode); The exciting curent of first coil 22 and second coil 32 injects increase in time because of the battery current of first battery cell 21 and second battery cell 31, and this stage can be described as the energy balance district; And break off (charge mode) when not being communicated with when first switch 25 and second switch 35; Exciting curent on second coil 32 and the tertiary coil 34 then will fill gradually and flow to first battery cell 21 and second battery cell 31; Therefore will reduce in time and gradually, and this stage can be described as the energy recuperation district.
The ratio in energy balance district and energy recuperation district is the performance that depends on Transformer Winding 40 here, and the energy transfer relationship is to transformer technology, and the little energy that transformer is remaining just can shorten its time.
Moreover, what this must explain in addition being, battery of the present invention is connected the energy balance circuit except that the foregoing description, and also extensible many Battery packs of series connection module is as shown in Figure 9, and Fig. 9 is the circuit diagram of the battery series connection energy balance circuit of another preferred embodiment of the present invention.It is between first battery module 20 and second battery module 30, to have additional a battery module 50 again; Battery module 50 also has a battery cell, a discharge loop and a charge circuit here; Its function under charge and discharge mode all with aforementioned identical, is not promptly given unnecessary details at this in addition.
Comprehensively above-mentioned, battery series connection energy balance circuit of the present invention is when it operates in balancing; Need not detect cell voltage, it is when the switch closure conducting, and battery and Transformer Winding form the loop; Battery current gets into Transformer Winding, produces exciting curent, makes energy get into transformer core by Transformer Winding; Energy can be transferred to low from height, and the higher battery of voltage charges to the battery than low pressure; When switch broke off not conducting, the energy of staying transformer can whereby, can reach following advantage through diode with energy recuperation and to battery charge:
1. need not to detect cell voltage: at present dissimilar batteries is different because of terminal voltage; Adding needs each cell voltage of monitoring in the equilibrium process, therefore existing balance method can't be common to dissimilar batteries (as: lead-acid battery, Ni-MH battery and lithium battery).But promptly can be applicable to the series connection balance of dissimilar batteries with circuit execution mode of the present invention.
2. discharge and recharge parallel: circuit execution mode of the present invention is not is not discharged and recharged path effects, can be applied in balance and battery discharge balance in the charging.
3. but stacked: according to the series-connected cell number, cooperate adjustment coil number, can not influenced by number of battery cells and ad infinitum expand.
4. efficient is high: circuit execution mode of the present invention is that energy shifts framework, non-energy consumption, and it is short with equilibration time to reach therefore that balance loss is few, efficient is high, and improves the battery utilance and increase the service life, and reduces the purpose of battery waste.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with preferred embodiment; Yet be not in order to limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (4)
1. battery series connection energy balance circuit is characterized in that it includes:
One first battery module; Include one first battery cell, one first discharge loop and one first charge circuit; This first discharge loop includes one first coil and connects with this first battery cell, and this first charge circuit then includes one second coil and one first diode to connect with this first battery cell;
One second battery module; Include one second battery cell, one second discharge loop and one second charge circuit; This second discharge loop includes this second coil and connects with this second battery cell, and this second charge circuit then includes a tertiary coil and one second diode to connect with this second battery cell; And
One Transformer Winding; Be coupled in this first coil, this second coil and this tertiary coil, under a discharge mode, this first discharge loop and this second discharge loop are the energy by this first coil of this Transformer Winding balance and this second coil; And discharge this first battery cell of balance and this second battery cell; And under a charge mode, the energy of this second coil is recharged to this first battery cell, and the energy of this tertiary coil is recharged to this second battery cell.
2. battery series connection energy balance circuit according to claim 1; It is characterized in that wherein said first battery module also includes one first switch; This first switch is to be connected in series with this first battery cell and this first coil; Be this discharge mode during its closed communicating, and when disconnection is not communicated with, be this charge mode.
3. battery series connection energy balance circuit according to claim 1; It is characterized in that wherein said second battery module also includes a second switch; This second switch is to be connected in series with this second battery cell and this second coil; Be this discharge mode during its closed communicating, and when disconnection is not communicated with, be this charge mode.
4. battery series connection energy balance circuit according to claim 1; It is characterized in that also including a plurality of battery modules; And each battery module all includes a battery cell, a discharge loop and a charge circuit; This discharge loop has a coil connects with this battery cell, and this charge circuit has another coil and a diode connecting with this battery cell, and those coils all are coupled in this Transformer Winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110094545XA CN102738843A (en) | 2011-04-07 | 2011-04-07 | Serial battery energy balancing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110094545XA CN102738843A (en) | 2011-04-07 | 2011-04-07 | Serial battery energy balancing circuit |
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| CN102738843A true CN102738843A (en) | 2012-10-17 |
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| CN201110094545XA Pending CN102738843A (en) | 2011-04-07 | 2011-04-07 | Serial battery energy balancing circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050140336A1 (en) * | 2003-12-26 | 2005-06-30 | Fuji Jukogyo Kabushiki Kaisha | Voltage equalizer for battery elements |
| JP2006074839A (en) * | 2004-08-31 | 2006-03-16 | Fuji Heavy Ind Ltd | Voltage equalizer of storage element |
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2011
- 2011-04-07 CN CN201110094545XA patent/CN102738843A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050140336A1 (en) * | 2003-12-26 | 2005-06-30 | Fuji Jukogyo Kabushiki Kaisha | Voltage equalizer for battery elements |
| JP2006074839A (en) * | 2004-08-31 | 2006-03-16 | Fuji Heavy Ind Ltd | Voltage equalizer of storage element |
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Application publication date: 20121017 |