CN102751757A - Lithium ion battery pack electricity quantity equalization method and system - Google Patents
Lithium ion battery pack electricity quantity equalization method and system Download PDFInfo
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- CN102751757A CN102751757A CN2012102266918A CN201210226691A CN102751757A CN 102751757 A CN102751757 A CN 102751757A CN 2012102266918 A CN2012102266918 A CN 2012102266918A CN 201210226691 A CN201210226691 A CN 201210226691A CN 102751757 A CN102751757 A CN 102751757A
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Abstract
The invention discloses a lithium ion battery pack electricity quantity equalization method which comprises the following steps of: collecting the voltage, current and temperature value of each monomer lithium ion battery in a lithium oil battery pack in real time; estimating the SOC (system on chip) value of each monomer lithium ion battery in the lithium ion battery pack according to the collected voltage, current and temperature value; comparing the voltage and SOC value of each monomer lithium ion battery in the lithium ion battery pack, and equalizing the electricity quantity of each lithium ion battery in the lithium ion battery pack when a result that the voltage and SOC value among each monomer lithium ion battery in the lithium ion battery pack are unequal is obtained through comparison. By the method, through the electricity quantity transfer among the monomer lithium ion battery, the electricity quantity of each monomer lithium ion battery is equalized, the problem that the lithium ion battery is at the over-charge or over-discharge state is prevented, the using efficiency of the lithium ion battery pack is improved, and the service life of the lithium ion battery pack is prolonged.
Description
Technical field
The application relates to the lithium ion battery field, particularly relates to a kind of lithium ion battery group electric weight equalization methods and system.
Background technology
Exhaustion day by day along with traditional energy; Environmental pollution serious day by day; Country has proposed the policy of energy-saving and emission-reduction, development low-carbon economy, lithium ion battery since its in application process, have the energy density height, characteristic such as fail safe is good, the life-span is long, memory-less effect, environmental protection and arrived application widely.In the use of lithium ion battery, high-power in order to obtain, big capacity need be formed the lithium ion battery group with series-parallel system with lithium ion battery.
Because the restriction of lithium ion battery manufacture level; It is consistent completely that performance between the monomer lithium ion battery can't reach; And the performance of lithium ion battery group makes the lithium ion battery group in use by the performance decision of monomer lithium ion battery, as long as the electric weight of certain monomer lithium ion battery is not enough; Will charge to the lithium ion battery group; Cause that other monomer lithium ion battery is in overcharge condition in the lithium ion battery group easily like this, cause the damage of lithium ion battery group, shorten useful life.
Summary of the invention
For solving the problems of the technologies described above; The application provides a kind of lithium ion battery group electric weight equalization methods and system; Through the mode that electric weight shifts, make that each monomer lithium ion battery reaches equilibrium state in the lithium ion battery group, avoided lithium ion battery to be in overcharging, the problem of over-discharge state.
Technical scheme is following:
A kind of lithium ion battery group electric weight equalization methods, said lithium ion battery group is made up of some monomer lithium ion batteries, and said equalization methods comprises:
Gather voltage, electric current and the temperature value of each monomer lithium ion battery in the said lithium ion battery group in real time;
Estimate the SOC value of each monomer lithium ion battery in the said lithium ion battery group according to voltage, electric current and the temperature value of said collection;
Voltage and SOC value to each monomer lithium ion battery in the said lithium ion battery group compare; When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium.
A kind of lithium ion battery group electric weight equalization methods, said lithium ion battery group is made up of some lithium ionic cell modules, and said lithium ionic cell module is made up of some monomer lithium ion batteries, and said equalization methods comprises:
Gather voltage, electric current and the temperature value of each monomer lithium ion battery in the said lithium ionic cell module in real time;
Voltage, electric current and temperature value according to said collection are estimated the SOC value of each monomer lithium ion battery in the said lithium ionic cell module, and calculate the total voltage and total SOC value of each lithium ionic cell module;
When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal; Each monomer lithium ion battery in the said lithium ionic cell module is carried out the electric weight equilibrium; Realize the equilibrium of inside modules; And when in said lithium ion battery group, existing between lithium ionic cell module total voltage or total SOC value unequal, said each lithium ionic cell module is carried out the electric weight equilibrium, realize the equilibrium between the module.
A kind of lithium ion battery group electric weight equalizing system, said lithium ion battery group is made up of some monomer lithium ion batteries, and said equalizing system comprises:
Acquisition module, estimation block and balance module;
Wherein:
Said acquisition module is used for gathering in real time voltage, electric current and the temperature value of said each monomer lithium ion battery of lithium ion battery group;
Said estimation block is used for estimating according to voltage, electric current and the temperature value of said acquisition module collection the SOC value of said each monomer lithium ion battery of lithium ion battery group;
Said balance module is used for the voltage of said each monomer lithium ion battery of lithium ion battery group and SOC value are compared; When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium.
Said system, preferred, said balance module comprises:
Comparing unit, switch matrix circuit and control unit;
Wherein:
Said comparing unit is used for the voltage of said each monomer lithium ion battery of lithium ion battery group and SOC value are compared;
Said switch matrix circuit is used between any two the monomer lithium ion batteries of said lithium ion battery group, equalizing circuit being set;
Said control unit is used for when said comparing unit relatively draws said lithium ion battery group and exists between the monomer lithium ion battery voltage or SOC value unequal; Start equalizing circuit, each monomer lithium ion battery of controlling in the said lithium ion battery group carries out the electric weight transfer.
Said system, preferred, said equalizing circuit is two separate charging and discharging circuit, said charging and discharging circuit is used for controlling said two monomer lithium ion batteries and carries out the direction that electric weight balancing procedure electric weight shifts.
A kind of lithium ion battery group electric weight equalizing system, said lithium ion battery group is made up of some lithium ionic cell modules, and said lithium ionic cell module is made up of some monomer lithium ion batteries, and said equalizing system comprises:
Acquisition module, estimation block, computing module and balance module;
Wherein:
Said acquisition module is used for gathering in real time voltage, electric current and the temperature value of each monomer lithium ion battery of said lithium ionic cell module;
Said estimation block is used for estimating according to voltage, electric current and the temperature value of said acquisition module collection the SOC value of said each monomer lithium ion battery of lithium ion battery group;
Said computing module is used for the SOC value of each monomer lithium ion battery that voltage, current value and the estimation of said estimation block according to each monomer lithium ion battery of said acquisition module collection obtain, and calculates the total voltage of each lithium ionic cell module in the said lithium ion battery group and total SOC value;
Said balance module is used for the total voltage of the voltage of each monomer lithium ion battery in the said lithium ionic cell module and SOC value and said each lithium ionic cell module of lithium ion battery group is compared with total SOC value, and respectively each monomer lithium ion battery in the said lithium ionic cell module and said each lithium ionic cell module is carried out the electric weight equilibrium according to comparative result.
Said system, preferred, said balance module comprises:
Comparing unit, switch matrix circuit and control unit;
Wherein:
Said comparing unit is used for the total voltage of each lithium ionic cell module in the voltage of each monomer lithium ion battery of said lithium ionic cell module and SOC value and the said lithium ion battery group is compared with total SOC value;
Said switch matrix circuit is used between any two lithium ionic cell modules of said lithium ion battery group and in the lithium ionic cell module, between any two monomer lithium ion batteries the electric weight equalizing circuit being set;
Said control unit is used for when said comparing unit relatively draws said lithium ionic cell module and exists between the monomer lithium ion battery voltage or SOC value unequal; Start said equalizing circuit; Control interior each monomer lithium ion battery of said lithium ionic cell module and carry out the electric weight transfer; Realize the equilibrium of inside modules; And when in said lithium ion battery group, existing between the lithium ionic cell module total voltage or total SOC value unequal, control said each lithium ionic cell module and carry out electric weight and shift the equilibrium between the realization module.
Said system; Preferably; Said equalizing circuit is two separate charging and discharging circuit, and said charging and discharging circuit is used for controlling that said two monomer lithium ion batteries carry out the electric weight balancing procedure and said two lithium ionic cell modules carry out the direction that electric weight shifts in the electric weight balancing procedure.
Said system; Preferably; Voltage or SOC value that said control unit also is used for each monomer lithium ion battery in said lithium ionic cell module all equate; When existing between the lithium ionic cell module total voltage or total SOC value unequal in the said lithium ion battery group, control said each monomer lithium ionic cell module and carry out the electric weight transfer.
Technical scheme by above the application provides is visible; A kind of lithium ion battery group electric weight equalizing system and method that the application provides make electric weight to the lithium ion battery group carry out balancedly finally making the electric weight of each monomer lithium ion battery in the lithium ion battery group reach poised state through the control switch matrix circuit.
Use lithium ion battery group electric weight equalization methods and system that the application provides; Gather voltage, electric current and the temperature value of each monomer lithium ion battery in the said lithium ion battery group in real time, and estimate the SOC value of each monomer lithium ion battery in the said lithium ion battery group according to voltage, electric current and the temperature value of said collection; Voltage and SOC value to each monomer lithium ion battery in the said lithium ion battery group compare; When in relatively drawing said lithium ion battery group, having the unequal monomer lithium ion battery of voltage or SOC value; The control switch matrix circuit; Electric weight in the high lithium ion battery of voltage or SOC value is transferred in the low lithium ion battery of voltage or SOC value, and the electric weight in said lithium ion battery group between each monomer lithium ion battery reaches poised state, further; If said lithium ion battery group is made up of lithium ionic cell module; Said lithium ionic cell module is made up of the monomer lithium ion battery, and said lithium ion battery group electric weight equalizing system can also be at first to carrying out the electric weight equilibrium in the lithium ionic cell module between the monomer lithium ion battery, when reaching equilibrium state between the monomer lithium ion battery in the module; Electric weight between lithium ionic cell module is carried out equilibrium; All at equilibrium up to all monomer lithium ion batteries, avoid in the said lithium ion battery group monomer lithium ion battery to be in and overcharged the problem of over-discharge state.
In addition; The balancing procedure of said lithium ion battery group electric weight equalizing system is the process that electric weight shifts; Be that electric weight is directly transferred to voltage or the low lithium ion battery of SOC value from voltage or the high lithium ion battery of SOC value, need do not discharge, on the one hand by components and parts such as outer meeting resistances; The heat of when having avoided energy consumption, having avoided producing in the outer meeting resistance discharge process is to the influence of lithium ion battery group; The balancing procedure of said on the other hand lithium ion battery equalizing system is big current balance, has improved balancing speed, belongs to fast uniform.Therefore; Said lithium ion battery group electric weight equalizing system is an initiatively equalizing system of a kind of self adaptation; Promptly no matter battery is when charging, discharge or leaving standstill, and all can carry out balanced management, finally makes the monomer lithium ion battery in the said lithium ion battery group be in balanced operating state.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the application embodiment; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the application, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of lithium ion battery group electric weight equalizing system that Fig. 1 provides for the application embodiment one;
The structural representation of the balance module that Fig. 2 provides for the application embodiment one;
The structural representation of the equalizing circuit that Fig. 3 provides for the application embodiment one;
The structural representation of a kind of lithium ion battery group electric weight equalizing system that Fig. 4 provides for the application embodiment two;
The structural representation of the balance module that Fig. 5 provides for the application embodiment two;
The flow chart of a kind of lithium ion battery group electric weight equalization methods that Fig. 6 provides for the application embodiment three;
The flow chart of a kind of lithium ion battery group electric weight equalization methods that Fig. 7 provides for the application embodiment four.
For illustrated simple and clear, above accompanying drawing shows the common form of structure, and for fear of unnecessary fuzzy the present invention, can omit the description and the details of known features and technology.In addition, the unit in the accompanying drawing is unnecessary proportionally draws.For example, can be with respect to the size of some unit in other unit enlarged drawings, thus help better to understand embodiments of the invention.Same numeral in the different accompanying drawings is represented identical unit.
Embodiment
In order to make those skilled in the art person understand the application's scheme better.To combine the accompanying drawing among the application embodiment below, the technical scheme among the application embodiment is carried out clear, intactly description, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
Embodiment one
The structural representation of a kind of lithium ion battery group electric weight equalizing system that the application embodiment provides is as shown in Figure 1, comprising:
After estimation block 102 receives voltage, electric current and the temperature value of each monomer lithium ion battery that said acquisition module 101 sends; According to said voltage, electric current and temperature value; Through the SOC of each monomer lithium ion battery in the said lithium ion battery group 104 of SOC algorithm computation, and voltage, electric current and the SOC value of said each monomer lithium ion battery sent to balance module.Concrete, the function available microprocessors of said estimation block realizes.
Said balance module 103 is behind the voltage and SOC value that receive each monomer lithium ion battery that said estimation block sends; Voltage and SOC value to each monomer lithium ion battery in the said lithium ion battery group 104 compare; When in relatively drawing said lithium ion battery group 104, existing between the monomer lithium ion battery voltage or SOC value unequal; Start equalization function, the electric weight of each monomer lithium ion battery in the said lithium ion battery group 104 is carried out equilibrium.
Concrete, the structural representation of said balance module 103 is as shown in Figure 2, comprising:
Comparing unit 201, switch matrix circuit 202 and control unit 203;
After comparing unit 201 receives the voltage and SOC value of each monomer lithium ion battery that said estimation block 102 sends; Voltage and SOC value to each monomer lithium ion battery compare respectively; Whether the voltage or the SOC that judge said each monomer lithium ion battery equate, and comparative result are sent to control unit 203.
Concrete; Said equalizing circuit is two separate charging and discharging circuit; The transfer that two charging and discharging circuit are electric weight between two monomer lithium ion batteries provides the electric weight transferring path, and the direction that electric weight shifts is from the high monomer lithium ion battery of voltage or SOC value to voltage or the direction of the low lithium ion battery of SOC value.When carrying out electric weight between two monomer lithium ion batteries when balanced, select corresponding charging and discharging circuit through gate-controlled switch, electric weight in the high lithium ion battery of voltage or SOC value is transferred in the low lithium ion battery of voltage or SOC value.
Concrete, for the ease of describing, suppose that here the monomer lithium ion battery has four in the said lithium ion battery group 104, be respectively B
1, B
2, B
3And B
4, said B
1, B
2, B
3And B
4Between be series relationship, said switch matrix circuit 202 is respectively at B
1And B
2Between, B
1And B
3Between, B
1And B
4Between, B
2And B
3Between, B
2And B
4Between and B
3And B
4Between be provided with equalizing circuit, said equalizing circuit is two separate charging and discharging circuit.
For example, B
1And B
2Between the structural representation of equalizing circuit as shown in Figure 3, need to prove that this figure be the simple structure sketch map of charging and discharging circuit only, does not represent the circuit diagram of reality.B
1And B
2Between be provided with two independently charging and discharging circuit, said charging and discharging circuit is selected through two gate-controlled switch k1 and k2, works as B
1And B
2Between when needing electric weight balanced, two controlled choice-starts of control unit control are selected corresponding charging and discharging circuit, make B
1And B
2Between carry out the electric weight equilibrium, work as B
1And B
2Between when not needing electric weight balanced, control unit control B
1And B
2Between two gate-controlled switches break off, charging and discharging circuit is broken off.The setting of the equalizing circuit between other any two monomer lithium ions in like manner.
Concrete, when relatively drawing B
1Voltage or SOC value greater than B
2Voltage or SOC value, control unit drives gate-controlled switch k1 and k2 simultaneously, makes that contact 1a and the 1c of k1 are closed, the contact 2a of k2 and 2c closure, at this moment, B
1Electric weight transfer to B through the charging and discharging circuit of selecting
2In, work as B
1And B
2Between voltage or SOC value when all equating, break off said charging and discharging circuit, B
1And B
2Between reach equilibrium state.On the contrary, if B
1Voltage or SOC value less than B
2Voltage or SOC value, control unit drives gate-controlled switch k1 and k2 simultaneously, makes that contact 1a and the 1b of k1 are closed, the contact 2a of k2 and 2b closure, at this moment, B
2Electric weight transfer to B through the charging and discharging circuit of selecting
1In, work as B
1And B
2Between voltage or SOC value when all equating, break off said charging and discharging circuit, B
1And B
2Between reach equilibrium state.Electric weight balancing procedure between other any two monomer lithium ion batteries in like manner.
Based on foregoing description, the course of work of said lithium ion battery group electric weight equalizing system is:
The lithium ion battery B that estimation block 102 is sent according to the said acquisition module 101 that receives
1, B
2, B
3And B
4Voltage, electric current and temperature value, estimate said each lithium ion battery B
1, B
2, B
3And B
4State-of-charge SOC be respectively SOC
1, SOC
2, SOC
3And SOC
4 Said estimation block 102 sends to the comparing unit 201 in the balance module 103 with voltage, electric current and the SOC of each monomer lithium ion battery;
201 couples of lithium ion battery B of comparing unit
1, B
2, B
3And B
4Voltage and SOC value compare respectively, judge said each monomer lithium ion battery B
1, B
2, B
3And B
4Voltage or SOC value whether equate, and comparative result is sent to control unit 203.
For example, there is unequal situation in the state-of-charge value SOC of each lithium ion battery of supposing to record, is specially SOC
1>SOC
2=SOC
3>SOC
4, control unit 203 drives B in the said switch matrix circuit 202 so
1And B
2Between, B
1And B
3Between, B
1And B
4Between, B
2And B
4Between, B
3And B
4Between gate-controlled switch, closed B
1And B
2Between, B
1And B
3Between, B
1And B
4Between, B
2And B
4Between, B
3And B
4Between charging and discharging circuit, this moment charging and discharging circuit in the electric weight shift direction be from B
1Transfer to B
2, B
3And B
4, from B
2Transfer to B
4, from B
3Transfer to B
4, in balancing procedure, when the SOC value between any two monomer lithium ion batteries equates, break off said charging and discharging circuit; When difference appears in the SOC value between any two monomer lithium ion batteries, suppose B
2And B
3Between the SOC value by equating to become when unequal, be specially SOC
1>SOC
2>SOC
3>SOC
4, so, also need drive B
2And B
3Between gate-controlled switch, make B
2In electric weight transfer to B
3In.
Embodiment two
When said lithium ion battery group comprises a plurality of lithium ion battery pack module; Promptly at first form lithium ionic cell module by a plurality of monomer lithium ion batteries; Form the lithium ion battery group by a plurality of lithium ionic cell modules then; The structural representation of said lithium ion battery group electric weight equalizing system is as shown in Figure 4, comprising:
After estimation block 402 receives voltage, electric current and the temperature value of each monomer lithium ion battery that said acquisition module 401 sends; According to said voltage, electric current and temperature value; Through the SOC of said each monomer lithium ion battery of SOC algorithm estimation, and voltage, electric current and the SOC value of said each monomer lithium ion battery sent to balance module 404.
Said computing module 403 is used for estimating according to the voltage of each monomer lithium ion battery of said acquisition module 401 collections, current value and said estimation block 402 the SOC value of each monomer lithium ion battery that obtains; Calculate the total voltage and total SOC value of each lithium ionic cell module in the said lithium ion battery group 405, and the total voltage of said each lithium ionic cell module is sent by balance module 404 with total SOC value;
Said balance module 404 is used for total voltage and total SOC value of the voltage of each monomer lithium ion battery in the said lithium ionic cell module and SOC value and said each lithium ionic cell module of lithium ion battery group are compared; When relatively drawing the voltage that there is the monomer lithium ion battery in the lithium ionic cell module or SOC when unequal; At first start first order equilibrium; Electric weight to each monomer lithium ion battery in the lithium ionic cell module carries out equilibrium; Realize the equilibrium of inside modules, that is, make the electric weight of each monomer lithium ion battery in the lithium ionic cell module reach equilibrium state; When the electric weight between each monomer lithium ion battery reaches equilibrium in the module; It is balanced to start the second level; Promptly the electric weight between each lithium ionic cell module in the lithium ion battery group is carried out equilibrium; Realize the equilibrium between the module, that is, make that the electric weight between each lithium ionic cell module reaches poised state in the lithium ion battery group.
Concrete, the structural representation of said balance module 404 is as shown in Figure 5, comprising:
Comparing unit 501, switch matrix circuit 502 and control unit 503;
After comparing unit 501 receives voltage and the SOC value of each monomer lithium ion battery that said estimation block 402 sends and the total voltage of each lithium ionic cell module that computing module 403 sends, total SOC value; The voltage of each monomer lithium ion battery and the total voltage of SOC value and each lithium ionic cell module are compared respectively with total SOC value; Judge whether the voltage of said each monomer lithium ion battery or the total voltage of SOC and each lithium ionic cell module equate with total SOC value, and comparative result is sent to control unit 503.
Concrete; When relatively drawing when having the unequal monomer lithium ion battery of voltage or SOC in the lithium ionic cell module; At first start first order equilibrium; Be the closure and the disconnection of charging and discharging circuit between the inner monomer lithium ion battery of control module, make the electric weight of the high monomer lithium ion battery of inside modules voltage or SOC value transfer in the low monomer lithium ion battery of voltage or SOC value the equilibrium of realization inside modules; That is, make the electric weight of each monomer lithium ion battery in the lithium ionic cell module reach equilibrium state; When having the total voltage between lithium ionic cell module in the lithium ion battery group or always the SOC value is unequal; It is balanced to start the second level; Promptly control the closure and the disconnection of the charging and discharging circuit between the lithium ionic cell module, make electric weight in the high lithium ion battery group of total voltage or total SOC value transfer in the low lithium ion battery group of total voltage or total SOC value the equilibrium between the realization module; That is, make that the electric weight between each lithium ionic cell module reaches poised state in the lithium ion battery group.
Further; When the voltage that relatively draws monomer lithium ion battery in the lithium ionic cell module and SOC value all equate; When existing total voltage or total SOC value of lithium ionic cell module unequal in the lithium ion battery group; Directly the electric weight between the lithium ionic cell module is carried out equilibrium; The closure and the disconnection of the charging and discharging circuit of control between the lithium ionic cell module are transferred in total voltage or the lithium ion battery group that always the SOC value is low electric weight in the high lithium ion battery group of total voltage or total SOC value, reach the equilibrium of electric weight between the lithium ionic cell module.
Embodiment three
The flow chart of the lithium ion battery group electric weight equalization methods that the application embodiment provides is as shown in Figure 6, comprising:
Step S101: voltage, electric current and the temperature value of gathering each monomer lithium ion battery in the said lithium ion battery group in real time;
Concrete; Gather the voltage of each monomer lithium ion battery in the said lithium ion battery group through voltage sensor or special-purpose voltage acquisition chip, gather the electric current and the temperature value of each monomer lithium ion battery in the said lithium ion battery group through current sensor and temperature sensor.
Step S102: the SOC value of estimating each monomer lithium ion battery in the said lithium ion battery group according to voltage, electric current and the temperature value of said collection;
Concrete, through the SOC value of each monomer lithium ion battery in the said lithium ion battery group of SOC algorithm computation.
Step S103: when in relatively drawing said lithium ion battery group, having the unequal monomer lithium ion battery of voltage or SOC value, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium.
Concrete; Voltage and SOC value to each monomer lithium ion battery in the said lithium ion battery group compare, when in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal, promptly no matter be voltage or SOC value; As long as have one when unequal; Start equalization function, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium, till the electric weight of said each monomer lithium ion battery reaches poised state.
Embodiment four
The flow chart of the lithium ion battery group electric weight equalization methods that the application embodiment provides is as shown in Figure 7, comprising:
Step S101: voltage, electric current and the temperature value of gathering each monomer lithium ion battery in the said lithium ionic cell module in real time;
Step S102: voltage, electric current and temperature value according to said collection are estimated the SOC value of each monomer lithium ion battery in the said lithium ion battery group, and calculate the total SOC value of total voltage of each lithium ionic cell module;
Step S103: when in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal; To carrying out the electric weight equilibrium between each monomer lithium ion battery in the said lithium ionic cell module; And when in said lithium ion battery group, existing between lithium ionic cell module total voltage or total SOC value unequal, said each lithium ionic cell module is carried out the electric weight equilibrium.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses all is the difference with other embodiment.The above only is the application's a embodiment; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection range.
Claims (9)
1. lithium ion battery group electric weight equalization methods, said lithium ion battery group is made up of some monomer lithium ion batteries, it is characterized in that, and said equalization methods comprises:
Gather voltage, electric current and the temperature value of each monomer lithium ion battery in the said lithium ion battery group in real time;
Estimate the SOC value of each monomer lithium ion battery in the said lithium ion battery group according to voltage, electric current and the temperature value of said collection;
Voltage and SOC value to each monomer lithium ion battery in the said lithium ion battery group compare; When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium.
2. lithium ion battery group electric weight equalization methods, said lithium ion battery group is made up of some lithium ionic cell modules, and said lithium ionic cell module is made up of some monomer lithium ion batteries, it is characterized in that, and said equalization methods comprises:
Gather voltage, electric current and the temperature value of each monomer lithium ion battery in the said lithium ionic cell module in real time;
Voltage, electric current and temperature value according to said collection are estimated the SOC value of each monomer lithium ion battery in the said lithium ionic cell module, and calculate the total voltage and total SOC value of each lithium ionic cell module;
When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal; Each monomer lithium ion battery in the said lithium ionic cell module is carried out the electric weight equilibrium; Realize the equilibrium of inside modules; And when in said lithium ion battery group, existing between lithium ionic cell module total voltage or total SOC value unequal, said each lithium ionic cell module is carried out the electric weight equilibrium, realize the equilibrium between the module.
3. lithium ion battery group electric weight equalizing system, said lithium ion battery group is made up of some monomer lithium ion batteries, it is characterized in that, and said equalizing system comprises:
Acquisition module, estimation block and balance module;
Wherein:
Said acquisition module is used for gathering in real time voltage, electric current and the temperature value of said each monomer lithium ion battery of lithium ion battery group;
Said estimation block is used for estimating according to voltage, electric current and the temperature value of said acquisition module collection the SOC value of said each monomer lithium ion battery of lithium ion battery group;
Said balance module is used for the voltage of said each monomer lithium ion battery of lithium ion battery group and SOC value are compared; When in relatively drawing said lithium ion battery group, existing between the monomer lithium ion battery voltage or SOC value unequal, the electric weight of each monomer lithium ion battery in the said lithium ion battery group is carried out equilibrium.
4. system according to claim 3 is characterized in that, said balance module comprises:
Comparing unit, switch matrix circuit and control unit;
Wherein:
Said comparing unit is used for the voltage of said each monomer lithium ion battery of lithium ion battery group and SOC value are compared;
Said switch matrix circuit is used between any two the monomer lithium ion batteries of said lithium ion battery group, equalizing circuit being set;
Said control unit is used for when said comparing unit relatively draws said lithium ion battery group and exists between the monomer lithium ion battery voltage or SOC value unequal; Start equalizing circuit, each monomer lithium ion battery of controlling in the said lithium ion battery group carries out the electric weight transfer.
5. system according to claim 4 is characterized in that, said equalizing circuit is two separate charging and discharging circuit, and said charging and discharging circuit is used for controlling said two monomer lithium ion batteries and carries out the direction that electric weight balancing procedure electric weight shifts.
6. lithium ion battery group electric weight equalizing system, said lithium ion battery group is made up of some lithium ionic cell modules, and said lithium ionic cell module is made up of some monomer lithium ion batteries, it is characterized in that, and said equalizing system comprises:
Acquisition module, estimation block, computing module and balance module;
Wherein:
Said acquisition module is used for gathering in real time voltage, electric current and the temperature value of each monomer lithium ion battery of said lithium ionic cell module;
Said estimation block is used for estimating according to voltage, electric current and the temperature value of said acquisition module collection the SOC value of said each monomer lithium ion battery of lithium ion battery group;
Said computing module is used for the SOC value of each monomer lithium ion battery that voltage, current value and the estimation of said estimation block according to each monomer lithium ion battery of said acquisition module collection obtain, and calculates the total voltage of each lithium ionic cell module in the said lithium ion battery group and total SOC value;
Said balance module is used for the total voltage of the voltage of each monomer lithium ion battery in the said lithium ionic cell module and SOC value and said each lithium ionic cell module of lithium ion battery group is compared with total SOC value, and respectively each monomer lithium ion battery in the said lithium ionic cell module and said each lithium ionic cell module is carried out the electric weight equilibrium according to comparative result.
7. system according to claim 6 is characterized in that, said balance module comprises:
Comparing unit, switch matrix circuit and control unit;
Wherein:
Said comparing unit is used for the total voltage of each lithium ionic cell module in the voltage of each monomer lithium ion battery of said lithium ionic cell module and SOC value and the said lithium ion battery group is compared with total SOC value;
Said switch matrix circuit is used between any two lithium ionic cell modules of said lithium ion battery group and in the lithium ionic cell module, between any two monomer lithium ion batteries the electric weight equalizing circuit being set;
Said control unit is used for when said comparing unit relatively draws said lithium ionic cell module and exists between the monomer lithium ion battery voltage or SOC value unequal; Start said equalizing circuit; Control interior each monomer lithium ion battery of said lithium ionic cell module and carry out the electric weight transfer; Realize the equilibrium of inside modules; And when in said lithium ion battery group, existing between the lithium ionic cell module total voltage or total SOC value unequal, control said each lithium ionic cell module and carry out electric weight and shift the equilibrium between the realization module.
8. system according to claim 7; It is characterized in that; Said equalizing circuit is two separate charging and discharging circuit, and said charging and discharging circuit is used for controlling that said two monomer lithium ion batteries carry out the electric weight balancing procedure and said two lithium ionic cell modules carry out the direction that electric weight shifts in the electric weight balancing procedure.
9. system according to claim 7; It is characterized in that; Voltage or SOC value that said control unit also is used for each monomer lithium ion battery in said lithium ionic cell module all equate; When existing between the lithium ionic cell module total voltage or total SOC value unequal in the said lithium ion battery group, control said each monomer lithium ionic cell module and carry out the electric weight transfer.
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