CN105515138A - Battery equalization method, battery equalization controller and battery pack - Google Patents
Battery equalization method, battery equalization controller and battery pack Download PDFInfo
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- CN105515138A CN105515138A CN201610100162.1A CN201610100162A CN105515138A CN 105515138 A CN105515138 A CN 105515138A CN 201610100162 A CN201610100162 A CN 201610100162A CN 105515138 A CN105515138 A CN 105515138A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention provides a battery equalization method, a battery equalization controller and a battery pack. The method comprises: acquiring an equalization time coefficient of a battery cell of the battery pack; judging whether the equalization time coefficient of the battery cell is an effective value; if yes, acquiring accumulative running time of the above battery cell and equalizing the above battery cell according to the accumulative running time and the equalization time coefficient; if not, acquiring a coefficient of uniformity between the battery cells in the battery pack; and equalizing the above battery cell according to the coefficient of uniformity. In the battery running process, the battery is charged without additional battery equalization time, and equalization is available both in a charging phase and a discharging phase.
Description
Technical field
The present invention relates to cell art, in particular to a kind of battery equalization method, battery balanced controller and battery pack.
Background technology
At present, often carried out by multiple cell connecting or parallel connection, composition battery pack, is applied on new-energy automobile.Because the discharge and recharge rate between each cell in battery pack and battery capacity exist inconsistent problem, therefore cause partial monosomy battery to occur overcharging or crossing in charge and discharge process putting phenomenon, affect the life-span of whole battery pack.
In prior art, the method of passive equilibrium is usually adopted to carry out the poor battery of balanced consistency, passive balancing technique is exactly that electricity unnecessary in cell is dissipated into heat in the mode of resistance, but existing passive balancing technique can only be carried out when charging, and need first to judge whether that needs carry out equilibrium, carry out equilibrium again, cause consuming time longer like this.
Summary of the invention
In view of this, the invention provides a kind of battery equalization method, battery balanced controller and battery pack, first judge whether that needs carry out equilibrium for solving existing balancing technique, then carry out equilibrium, consuming time longer, and balanced problem can only be carried out when charging.
First aspect, embodiments provides a kind of battery equalization method, and described method comprises:
Obtain the time for balance coefficient of the cell of battery pack;
Whether the time for balance coefficient judging described cell is effective value;
When the time for balance coefficient of described cell is effective value, obtain the accumulated running time of described cell, according to described accumulated running time and described time for balance coefficient, equilibrium is carried out to described cell;
When the time for balance coefficient of described cell is invalid value, obtain the consistency coefficient between each cell in described battery pack, according to described consistency coefficient, equilibrium is carried out to described cell.
In conjunction with first aspect, embodiments provide the first possible implementation of above-mentioned first aspect, wherein, the time for balance coefficient of the cell of described acquisition battery pack, comprising:
Obtain the total run time of described cell and balanced opening time;
According to total run time and the described balanced opening time of described cell, calculate the time for balance coefficient of described cell.
In conjunction with first aspect, embodiments provide the implementation that the second of above-mentioned first aspect is possible, wherein, described according to described accumulated running time and described time for balance coefficient, equilibrium is carried out to described cell, comprising:
According to described accumulated running time and described time for balance coefficient, calculate the balanced opening time of described cell;
Control equalizing circuit corresponding to described cell to open, equilibrium is carried out to described cell;
When the opening time of described equalizing circuit reaches the balanced opening time of described cell, control equalizing circuit corresponding to described cell and close.
In conjunction with first aspect, embodiments provide the third possible implementation of above-mentioned first aspect, wherein, described according to described accumulated running time and described time for balance coefficient, after equilibrium is carried out to described cell, also comprise:
Obtain the consistency coefficient between each cell in described battery pack;
Judge whether the consistency coefficient between described each cell is greater than or equal to preset value;
If the consistency coefficient between described each cell is greater than or equal to preset value, then remove described time for balance coefficient;
If the consistency coefficient between described each cell is less than preset value, then store described time for balance coefficient.
In conjunction with first aspect, embodiments provide the 4th kind of possible implementation of above-mentioned first aspect, wherein, described according to described consistency coefficient, equilibrium is carried out to described cell, comprising:
Judge whether the consistency coefficient between described each cell is less than preset value;
If the consistency coefficient between described each cell is less than preset value, then equilibrium is carried out to described cell, and again obtain the time for balance coefficient of described cell.
Second aspect, embodiments provides a kind of battery balanced controller, comprising:
Acquisition module, for obtaining the time for balance coefficient of the cell of battery pack;
Judge module, for judging whether the time for balance coefficient of described cell is effective value;
First balance module, for when the time for balance coefficient of described cell is effective value, obtains the accumulated running time of described cell, according to described accumulated running time and described time for balance coefficient, carries out equilibrium to described cell;
Second balance module, for when the time for balance coefficient of described cell is invalid value, obtains the consistency coefficient between each cell in described battery pack, according to described consistency coefficient, carries out equilibrium to described cell.
In conjunction with second aspect, embodiments provide the first possible implementation of above-mentioned second aspect, wherein, described acquisition module comprises:
Acquiring unit, for obtaining the total run time of described cell and balanced opening time;
First computing unit, for according to the total run time of described cell and described balanced opening time, calculates the time for balance coefficient of described cell.
In conjunction with second aspect, embodiments provide the implementation that the second of above-mentioned second aspect is possible, wherein, described first balance module comprises:
Second computing unit, for according to described accumulated running time and described time for balance coefficient, calculates the balanced opening time of described cell;
Control unit, opening for controlling equalizing circuit corresponding to described cell, carrying out equilibrium to described cell; Also for, when the opening time of described equalizing circuit reaches the balanced opening time of described cell, control equalizing circuit corresponding to described cell and close.
In conjunction with second aspect, embodiments provide the third possible implementation of above-mentioned second aspect, wherein, described second balance module comprises:
Judging unit, for judging whether the consistency coefficient between described each cell is less than preset value;
Balanced unit, if be less than preset value for the consistency coefficient between described each cell, then carries out equilibrium to described cell, and again obtains the time for balance coefficient of described cell.
The third aspect, embodiments provides a kind of battery pack, comprising: multiple cell, multiple equalizing circuit, band EEPROM (Electrically Erasable Programmable Read Only Memo) EEPROM and the battery balanced controller described in above-mentioned second aspect;
Equalizing circuit and cell one_to_one corresponding;
The cell that equalizing circuit is corresponding with it respectively connects, and described battery balanced controller is connected with described EEPROM and described multiple equalizing circuit respectively;
Described EEPROM is for storing accumulated running time and the time for balance coefficient of each cell;
Described battery balanced controller carries out equilibrium for controlling the equalizing circuit pair cell corresponding with it.
Battery equalization method provided by the invention, battery balanced controller and battery pack, in the process of battery operation, battery is charged, do not need additionally to increase the battery balanced time, both can carry out equilibrium in the charging stage, and can carry out equilibrium at discharge regime yet.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the flow chart of a kind of battery equalization method that the embodiment of the present invention 1 provides;
Fig. 2 shows the structural representation of a kind of battery balanced controller that the embodiment of the present invention 2 provides;
Fig. 3 shows the structural representation of a kind of battery pack that the embodiment of the present invention 3 provides;
Fig. 4 shows the circuit diagram of a kind of battery pack that the embodiment of the present invention 3 provides.
Fig. 4 description of reference numerals is as follows:
R, resistance; S, switch; 310, cell; 320, equalizing circuit.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Consider in prior art, when adopting the method for passive equilibrium to carry out equilibrium to the battery that consistency is poor, can only carry out when charging, and need first to judge whether that needs carry out equilibrium, then carry out equilibrium, cause consuming time longer like this.Based on this, embodiments provide a kind of battery equalization method, battery balanced controller and battery pack.Be described below by embodiment.
Embodiment 1
Embodiments provide a kind of battery equalization method.The battery pack of being connected by multiple cell or being composed in parallel, because the discharge and recharge rate between each cell and battery capacity there are differences, partial monosomy battery can be caused like this to occur overcharging or crossing the phenomenon of putting, affect the life-span of whole battery pack, therefore, need to carry out equilibrium to above-mentioned battery pack.The embodiment of the present invention carries out equilibrium to battery in the process of battery operation, and not needing additionally increases the battery balanced time, both can carry out equilibrium in the charging stage, and also can carry out equilibrium at discharge regime.
The executive agent of the battery equalization method that the embodiment of the present invention provides is battery balanced controller, this battery balanced controller can be MCU (MicroControlUnit, microcontroller), at EEPROM (ElectricallyErasableProgrammableRead-OnlyMemory, band EEPROM (Electrically Erasable Programmable Read Only Memo)) in store the parameters such as the time for balance coefficient of each cell in battery pack and accumulated running time, above-mentioned battery balanced controller can read the above-mentioned parameter stored in EEPROM, and unlatching or the closedown of equalizing circuit corresponding to each cell is controlled according to above-mentioned parameter, equilibrium is carried out to each cell in above-mentioned battery pack.
As shown in Figure 1, the battery equalization method that the embodiment of the present invention provides, comprises step S110 ~ S140, specific as follows:
S110, obtains the time for balance coefficient of the cell of battery pack.
Wherein, above-mentioned battery pack is connected by multiple cell or is composed in parallel, and battery balanced controller obtains the time for balance coefficient of each cell in above-mentioned battery pack respectively.
As an embodiment, obtain the time for balance coefficient of the cell of battery pack, comprise the steps:
Obtain the total run time of above-mentioned cell and balanced opening time;
According to total run time and the balanced opening time of above-mentioned cell, calculate the time for balance coefficient of above-mentioned cell.
Wherein, to be connected by multiple cell due to above-mentioned battery pack or compose in parallel, therefore needing the time for balance coefficient obtaining each cell in above-mentioned battery pack.
In embodiments of the present invention, when above-mentioned battery pack is when running first, the total run time t of the cell recording above-mentioned battery pack is needed
1, and this total run time t
1refer to this battery pack and arrive this process of lower electricity at every turn from power on, and in the process run in above-mentioned battery pack, equilibrium is carried out to the cell of this battery pack, and record the time for balance of this cell, the time for balance of this cell is designated as t
2, the time for balance coefficient of this cell is designated as p, then can passes through formula p=t
2/ t
1calculate the time for balance coefficient p of this cell, and this time for balance coefficient p is stored in EEPROM, according to said method, the time for balance coefficient of each cell in above-mentioned battery pack can be obtained, and by the present EEPROM of time for balance coefficient storage corresponding for above-mentioned each cell, when above-mentioned battery pack powers on again, then directly read and be stored in time for balance coefficient corresponding to each cell in EEPROM.
S120, judges whether the time for balance coefficient of above-mentioned cell is effective value, when the time for balance coefficient of above-mentioned cell is effective value, then performs step S130, when the time for balance coefficient of above-mentioned cell is invalid value, then performs step S140.
Wherein, whether the time for balance coefficient judging above-mentioned cell is effective value, then refer to whether the time for balance coefficient judging this cell is the time for balance factor v that in this battery pack, each cell is conventional, the time for balance factor v that some are conventional is store in battery balanced controller, if the time for balance coefficient of the above-mentioned cell conventional time for balance factor v that are these or with the difference of above-mentioned conventional time for balance factor v in preset range, be then judged as that the time for balance coefficient of above-mentioned cell is effective value.If the time for balance coefficient of above-mentioned cell be 0 or and the difference of conventional time for balance factor v not in preset range, be then judged as that the time for balance coefficient of above-mentioned cell is invalid value.
If above-mentioned battery pack runs first time, at this moment the time for balance coefficient of each cell in above-mentioned battery pack is not also demarcated, at this moment, it is the time for balance coefficient that do not store each cell in EEPROM, at this moment, the time for balance coefficient read from EEPROM is then invalid value, or, the time for balance coefficient of each cell of above-mentioned battery pack does not store successfully in EEPROM, at this moment, the time for balance coefficient of the cell that battery balanced controller reads from EEPROM is 0 or 0xFF, at this moment, the time for balance coefficient of above-mentioned cell is also invalid value.
When after the time for balance coefficient that the cell of battery balanced controller reading EEPROM storage is corresponding, then need whether the time for balance coefficient judging above-mentioned cell is effective value, if the time for balance coefficient of above-mentioned cell is effective value, then perform step S130, if the time for balance coefficient of above-mentioned cell is invalid value, then perform step S140.
S130, obtains the accumulated running time of above-mentioned cell, according to above-mentioned accumulated running time and time for balance coefficient, carries out equilibrium to above-mentioned cell;
Wherein, the accumulated running time of above-mentioned cell refers to this cell and arrives this process of lower electricity from power on, from EEPROM, read the accumulated running time of this cell by battery balanced controller, and, reading be this cell accumulated running time when to power on last time.
As an embodiment, above-mentioned according to accumulated running time and time for balance coefficient, equilibrium is carried out to above-mentioned cell, comprises the steps:
According to above-mentioned accumulated running time and time for balance coefficient, calculate the balanced opening time of above-mentioned cell;
Control equalizing circuit corresponding to above-mentioned cell to open, equilibrium is carried out to above-mentioned cell;
When the opening time of equalizing circuit reaches the balanced opening time of above-mentioned cell, control equalizing circuit corresponding to above-mentioned cell and close.
In embodiments of the present invention, all corresponding equalizing circuit of each cell in above-mentioned battery pack, controls equalizing circuit corresponding to above-mentioned cell by battery balanced controller and carries out equilibrium to this cell.
Battery balanced controller reads the accumulated running time t that above-mentioned cell powered on last time from EEPROM, the time for balance coefficient of this cell is p, the balanced opening time of this cell is calculated by formula p*t, when after the balanced opening time calculating this cell, battery balanced controller then controls equalizing circuit corresponding to this cell and opens, equilibrium is carried out to this cell, after the opening time of equalizing circuit corresponding to above-mentioned cell reaches the balanced opening time of the above-mentioned cell calculated, battery balanced controller then controls equalizing circuit corresponding to this cell and cuts out, if the opening time of the equalizing circuit that above-mentioned cell is corresponding does not reach the balanced opening time of the above-mentioned cell calculated, then continue to carry out equilibrium to above-mentioned cell, until after the opening time of equalizing circuit corresponding to above-mentioned cell reaches the balanced opening time of the above-mentioned cell calculated, then battery balanced controller controls equalizing circuit cut out corresponding to above-mentioned cell again.
Wherein, above-mentioned battery balanced controller then controls equalizing circuit corresponding to above-mentioned cell and opens, open command can be sent by battery balanced controller to realize to the equalizing circuit that above-mentioned cell is corresponding, after the opening time of equalizing circuit corresponding to above-mentioned cell reaches the balanced opening time of the above-mentioned cell calculated, then battery balanced controller sends out code to equalizing circuit corresponding to this cell, to close equalizing circuit corresponding to this cell, stop carrying out equilibrium to this cell.
The above-mentioned process just describing one of them cell equilibrium in battery pack, the cell for other in above-mentioned battery pack is also just carry out equilibrium by said process.
Wherein, above-mentioned according to accumulated running time and time for balance coefficient, after equilibrium is carried out to above-mentioned cell, also comprise the steps:
Obtain the consistency coefficient between each cell in above-mentioned battery pack;
Judge whether the consistency coefficient between above-mentioned each cell is greater than or equal to preset value;
If the consistency coefficient of above-mentioned each cell is greater than or equal to preset value, then remove above-mentioned time for balance coefficient;
If the consistency coefficient of above-mentioned each cell is less than preset value, then store above-mentioned time for balance coefficient.
Wherein, consistency between above-mentioned each cell can by the SOC (stateofcharge of each cell of above-mentioned battery pack, state-of-charge) value or magnitude of voltage judge, such as, when difference between the maximum SOC value and minimum SOC value of each cell of above-mentioned battery pack is greater than preset difference value, then think above-mentioned battery pack each cell between consistency poor, at this moment, need to carry out equilibrium to the cell of above-mentioned battery pack.
In embodiments of the present invention, consistency coefficient refers to the ratio of SOC value that in above-mentioned battery pack, each cell is corresponding or magnitude of voltage, ideally, in above-mentioned battery pack, the SOC value of each cell or magnitude of voltage should be equal, therefore, consistency coefficient between each cell of above-mentioned battery pack is 1, but, because the discharge and recharge rate between each cell and battery capacity etc. there are differences, therefore, the consistency coefficient of each cell of above-mentioned battery pack can not be 1, but, the consistency coefficient of each cell of above-mentioned battery pack is more close to 1, then illustrate that the consistency between above-mentioned each cell is better, in embodiments of the present invention, a numerical value can be pre-set, this numerical value pre-set is exactly preset value, this preset value can be 0.9, 0.95 or 0.98 etc., this preset value can be arranged according to actual conditions, the embodiment of the present invention does not limit the concrete numerical value of above-mentioned preset value, battery balanced controller can obtain the consistency coefficient in above-mentioned battery pack between each cell in real time or regularly, and by the consistency coefficient between each cell obtained and above-mentioned preset value are compared, judge the consistency between each cell in above-mentioned battery pack.
In embodiments of the present invention, when after the balanced opening time that the opening time of equalizing circuit corresponding to above-mentioned cell reaches above-mentioned cell, close the equalizing circuit that above-mentioned cell is corresponding, battery balanced controller can obtain the consistency coefficient between each cell afterwards, and judge whether the consistency coefficient between above-mentioned each cell is greater than or equal to preset value, if the consistency coefficient between above-mentioned each cell is greater than or equal to preset value, then illustrate that the consistency between above-mentioned each cell is better, at this moment, each cell of above-mentioned battery pack does not then need to carry out equilibrium, at this moment, need to remove the time for balance coefficient stored in EEPROM, prevent when above-mentioned battery pack powers on again, above-mentioned battery balanced controller continues to carry out equilibrium to the cell of this battery pack, if the consistency coefficient between above-mentioned each cell is less than preset value, then illustrate that the consistency between above-mentioned each cell is poor, at this moment, then need to store time for balance coefficient corresponding to above-mentioned each cell, like this, when above-mentioned battery pack powers on again, battery balanced controller can continue to read in EEPROM the accumulated running time of time for balance coefficient corresponding to above-mentioned each cell of storing and this battery pack each cell last time, time for balance coefficient corresponding for above-mentioned cell is multiplied by the accumulated running time of this cell last time, calculate the balanced opening time of this cell, and the balanced opening time of each cell in above-mentioned battery pack is calculated according to aforesaid way, and the balanced open-interval equilibrium corresponding with it is carried out to each cell of above-mentioned battery pack, until the consistency coefficient between above-mentioned each cell is greater than or equal to preset value, consistency namely between above-mentioned each cell then stops equilibrium time better, namely remove the time for balance coefficient that above-mentioned each cell is corresponding.
S140, obtains the consistency coefficient between each cell in above-mentioned battery pack, according to this consistency coefficient, carries out equilibrium to above-mentioned cell.
Battery balanced controller can obtain the consistency coefficient in above-mentioned battery pack between each cell in real time or regularly, and compares with the preset value of its storage, judges the consistency between above-mentioned each cell.
Wherein, according to above-mentioned consistency coefficient, equilibrium is carried out to above-mentioned cell, specifically comprises the steps:
Judge whether the consistency coefficient between above-mentioned each cell is less than preset value;
If the consistency coefficient between above-mentioned each cell is less than preset value, then equilibrium is carried out to above-mentioned cell, and again obtain the time for balance coefficient of above-mentioned cell.
In embodiments of the present invention, when consistency coefficient between above-mentioned cell is greater than or equal to preset value, then illustrate that the consistency between above-mentioned cell is better, then do not need to carry out equilibrium to above-mentioned battery pack, if the consistency coefficient between above-mentioned cell is less than above-mentioned preset value, then illustrate that the consistency between above-mentioned cell is poor, at this moment, then battery balanced controller can control equalizing circuit unlatching corresponding to above-mentioned cell, equilibrium is carried out to above-mentioned cell, simultaneously, after the equalizing circuit that above-mentioned cell is corresponding is opened, also need the time of recording equalizing circuit unlatching, when above-mentioned cell meets equalizing circuit closedown condition, then close the equalizing circuit that above-mentioned cell is corresponding, and record the total time of above-mentioned cell operation, by the operation total time of equalizing circuit opening time corresponding for above-mentioned cell divided by above-mentioned cell, calculate the time for balance coefficient that this cell is corresponding, and by this time for balance coefficient storage in EEPROM, when above-mentioned battery pack powers on again, battery balanced controller directly can read time for balance coefficient corresponding to each cell of above-mentioned battery pack from EEPROM, and according to each cell accumulated running time last time of this time for balance coefficient and this battery pack, equilibrium is carried out to each cell of this battery pack.
Wherein, it is electric under above-mentioned equalizing circuit condition of closing then refers to the application system at above-mentioned battery pack stopping charging or this battery pack place, if this battery pack is applied on automobile, what then the application system at this battery pack place referred to is exactly automobile, and electricity refers to automobile closedown car key under the application system at this battery pack place, such as, if above-mentioned battery pack is in the charging stage, after above-mentioned battery pack completes charging, at this moment need to stop charging to this battery pack, also need to close equalizing circuit corresponding to each cell of this battery pack simultaneously, if above-mentioned battery pack is at discharge regime, under the application system at above-mentioned battery pack place during electricity, also to close equalizing circuit corresponding to each cell of this battery pack simultaneously.
The battery equalization method that the embodiment of the present invention provides, charges to battery in the process of battery operation, and not needing additionally increases the battery balanced time, both can carry out equilibrium in the charging stage, and also can carry out equilibrium at discharge regime.
Embodiment 2
Embodiments provide a kind of battery balanced controller.Wherein, this battery balanced controller can be MCU, this battery balanced controller can read the parameter such as time for balance coefficient and accumulated running time of each cell in the battery pack stored in EEPROM, and unlatching or the closedown of equalizing circuit corresponding to each cell is controlled according to above-mentioned parameter, equilibrium is carried out to each cell in above-mentioned battery pack.The battery equalization method that this battery balanced controller provides for performing above-described embodiment 1.
As shown in Figure 2, the battery balanced controller that the embodiment of the present invention provides comprises: acquisition module 210, judge module 220, first balance module 230 and the second balance module 240.
Acquisition module 210, for obtaining the time for balance coefficient of the cell of battery pack;
Judge module 220, for judging whether the time for balance coefficient of above-mentioned cell is effective value;
First balance module 230, for when the time for balance coefficient of above-mentioned cell is effective value, obtains the accumulated running time of above-mentioned cell, according to above-mentioned accumulated running time and time for balance coefficient, carries out equilibrium to above-mentioned cell;
Second balance module 240, for when the time for balance coefficient of above-mentioned cell is invalid value, obtains the consistency coefficient between each cell in above-mentioned battery pack, according to this consistency coefficient, carries out equilibrium to above-mentioned cell.
In embodiments of the present invention, acquisition module 210 in battery balanced controller can obtain the time for balance coefficient of each cell in battery pack, and the time for balance coefficient of the cell of acquisition is sent to judge module 220, after judge module 220 receives the time for balance coefficient of the cell that acquisition module 210 sends, whether the time for balance coefficient that can judge this cell is effective value, if the time for balance coefficient of this cell is effective value, from EEPROM, the accumulated running time of this cell is then obtained by the first balance module 230, accumulated running time of this cell is this cell accumulated running time when to power on last time, refer to this cell and arrive this time period of lower electricity from power on, and according to accumulated running time of this cell and time for balance coefficient, equilibrium is carried out to above-mentioned cell, if the time for balance coefficient of above-mentioned cell is invalid value, then obtain the consistency coefficient in above-mentioned battery pack between each cell by the second balance module 240, according to this consistency coefficient, equilibrium is carried out to above-mentioned cell.
Wherein, as an embodiment, above-mentioned acquisition module 210 comprises:
Acquiring unit and the first computing unit;
Acquiring unit, for obtaining the total run time of above-mentioned cell and balanced opening time;
First computing unit, for according to the total run time of above-mentioned cell and above-mentioned balanced opening time, calculates the time for balance coefficient of above-mentioned cell.
In embodiments of the present invention, when above-mentioned battery pack is when running first, the acquiring unit in acquisition module 210 can obtain the total run time t of the cell in above-mentioned battery pack
1and the time for balance t of this cell
2, and by the total run time t of the cell of acquisition
1and the time for balance t of this cell
2send to the first computing unit, when the first computing unit receives the total run time t of the above-mentioned cell that acquiring unit sends
1and the time for balance t of this cell
2after, by formula p=t
2/ t
1calculate the time for balance coefficient p of this cell, and the time for balance coefficient p calculated is transferred to EEPROM, stored by EEPROM, above-mentioned acquiring unit can obtain operation total time and the time for balance of each cell in above-mentioned battery pack, the time for balance coefficient of each cell in above-mentioned battery pack is calculated by the first computing unit, and the time for balance coefficient of each cell is sent to EEPROM, stored by EEPROM, when above-mentioned battery pack powers on again, then acquisition module 210 directly can read and be stored in time for balance coefficient corresponding to each cell in EEPROM.
Wherein, as an embodiment, above-mentioned first balance module 230 comprises:
Second computing unit and control unit;
Second computing unit, for according to above-mentioned accumulated running time and time for balance coefficient, calculates the balanced opening time of above-mentioned cell;
Control unit, opening for controlling equalizing circuit corresponding to above-mentioned cell, carrying out equilibrium to above-mentioned cell; Also for, when the opening time of above-mentioned equalizing circuit reaches the balanced opening time of above-mentioned cell, control equalizing circuit corresponding to above-mentioned cell and close.
In embodiments of the present invention, above-mentioned second computing unit reads the accumulated running time t and time for balance coefficient p that above-mentioned cell powered on last time from EEPROM, the above-mentioned cell balanced opening time is calculated by formula p*t, when after the balanced opening time that the second computing unit calculates above-mentioned cell, the unlatching of equalizing circuit corresponding to this cell is controlled by control unit, equilibrium is carried out to above-mentioned cell, after the balanced opening time that above-mentioned cell is corresponding reaches the balanced opening time of the cell that above-mentioned second computing unit calculates, control unit then controls equalizing circuit corresponding to this cell and closes.
Wherein, as an embodiment, above-mentioned second balance module 240 comprises:
Judging unit and balanced unit;
Judging unit, for judging whether the consistency coefficient between above-mentioned each cell is less than preset value;
Balanced unit, if be less than preset value for the consistency coefficient between above-mentioned each cell, then carries out equilibrium to above-mentioned cell, and again obtains the time for balance coefficient of above-mentioned cell.
In embodiments of the present invention, second balance module 240 is understood in real time or is regularly obtained the consistency coefficient of each cell in above-mentioned battery pack, after the second balance module 240 obtains the consistency coefficient of each cell in above-mentioned battery pack, judging unit in second balance module 240 can judge whether the consistency coefficient between above-mentioned each cell is less than preset value, if the consistency coefficient between above-mentioned cell is less than preset value, then balanced unit carries out equilibrium to above-mentioned cell, and in the process of equilibrium, calculate the time for balance coefficient of above-mentioned cell, and by the time for balance coefficient storage that calculates in EEPROM, when above-mentioned battery pack powers on again, then directly read the time for balance coefficient that EEPROM stores.
The battery balanced controller that the embodiment of the present invention provides, charges to battery in the process of battery operation, and not needing additionally increases the battery balanced time, both can carry out equilibrium in the charging stage, and also can carry out equilibrium at discharge regime.
Embodiment 3
Embodiments provide a kind of battery pack.As shown in Figure 3, this battery pack comprises: the battery balanced controller 340 that multiple cell 310, multiple equalizing circuit 320, EEPROM330 and above-described embodiment 2 provide;
Equalizing circuit 320 and cell 310 one_to_one corresponding;
The cell 310 that equalizing circuit 320 is corresponding with it respectively connects, and above-mentioned battery balanced controller 340 is connected with above-mentioned EEPROM330 and multiple equalizing circuit respectively;
EEPROM330 is for storing accumulated running time and the time for balance coefficient of each cell 310;
Battery balanced controller 340 carries out equilibrium for controlling equalizing circuit 320 to the cell 310 corresponding with it.
Wherein, above-mentioned battery pack comprises multiple cell 310, and the plurality of cell 310 can be connected, also can be in parallel.The number of above-mentioned cell 310 can be arranged according to actual conditions, and the present invention does not limit the concrete number of above-mentioned cell 310.
Above-mentioned battery balanced controller 340 can be MCU.
In embodiments of the present invention, time for balance coefficient and the accumulated running time of each cell 310 of battery pack is store in EEPROM330, when above-mentioned battery pack powers on, battery balanced controller 340 can read time for balance coefficient and the accumulated running time of each cell 310 stored in EEPROM330, the Cumulative Elapsed Time of this cell 310 is the accumulated running time of above-mentioned battery pack this cell 310 when to power on last time, that this cell 310 powered on this time period of lower electricity last time, when battery balanced controller 340 read each cell 310 stored in EEPROM330 time for balance coefficient and after accumulated running time, whether the time for balance coefficient that can judge this cell 310 is effective value, if this time for balance coefficient is effective value, then above-mentioned battery balanced controller 340 can according to the time for balance coefficient of above-mentioned cell 310 and accumulated running time, the equalizing circuit 320 controlling this cell 310 correspondence carries out equilibrium to this cell 310, if the time for balance coefficient of above-mentioned cell 310 is invalid value, then above-mentioned battery balanced controller 340 can obtain the consistency coefficient in above-mentioned battery pack between each cell 310, and according to this consistency coefficient, the equalizing circuit 320 controlling this cell 310 correspondence carries out equilibrium to above-mentioned cell 310, and in the process of equilibrium, again the time for balance coefficient of each cell 310 in this battery pack is obtained, and by this time for balance coefficient storage in EEPROM330.
Wherein, above-mentioned equalizing circuit 320 is composed in series by resistance and switch, and when carrying out equilibrium, the unnecessary electricity of the cell be connected with this equalizing circuit 320 is dissipated into heat by above-mentioned resistance.
In order to introduce the annexation in above-mentioned battery pack between each components and parts in more detail, next will for 3 cells and 3 equalizing circuits, introduce the annexation between cell, equalizing circuit and EEPROM in above-mentioned battery pack, battery balanced control circuit in detail, as shown in Figure 4.The embodiment of the present invention also limits the concrete number of above-mentioned cell and equalizing circuit.
In embodiments of the present invention, equalizing circuit 320 is composed in series by resistance R and switch S, therefore, the positive pole of cell 310 is connected with switch S, the negative pole of cell 310 is connected with resistance R, resistance R is connected with switch S, like this, cell 310, switch S and resistance R form a series loop, battery balanced controller 340 is connected with switch S, the disconnection of control switch S is with closed, when the switch s is closed, equalizing circuit 320 is to carrying out balanced with the cell 310 that this equalizing circuit 320 connects, electricity unnecessary in the cell 310 be connected with this equalizing circuit 320 is dissipated into heat by the resistance R namely in this equalizing circuit 320, when switch S disconnects, equalizing circuit 320 stops carrying out balanced with the cell 310 that this equalizing circuit 320 connects, and battery balanced controller 340 reads the time for balance coefficient of this battery cell 310 and the accumulated running time of this battery cell 310 from EEPROM330, and whether the time for balance coefficient judging this cell 310 is effective value, if the time for balance coefficient of this cell 310 is effective value, then according to time for balance coefficient and the accumulated running time of this monomer electricity 310, control the closed of the equalizing circuit 320 breaker in middle S of this cell 310 correspondence and disconnect, equilibrium is carried out to this cell 310, if the time for balance coefficient of above-mentioned cell 310 correspondence is invalid value, then this battery balanced controller 340 can obtain the consistency coefficient in above-mentioned battery pack between each cell 310, and according to this consistency coefficient, controlling the closed of the equalizing circuit 320 breaker in middle S of this cell 310 correspondence carries out balanced with disconnection to above-mentioned cell 310, and in the process of equilibrium, again the time for balance coefficient of each cell 310 in this battery pack is obtained, and by this time for balance coefficient storage in EEPROM330.
The battery pack that the embodiment of the present invention provides, charges to battery in the process of battery operation, and not needing additionally increases the battery balanced time, both can carry out equilibrium in the charging stage, and also can carry out equilibrium at discharge regime.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. a battery equalization method, is characterized in that, comprising:
Obtain the time for balance coefficient of the cell of battery pack;
Whether the time for balance coefficient judging described cell is effective value;
When the time for balance coefficient of described cell is effective value, obtain the accumulated running time of described cell, according to described accumulated running time and described time for balance coefficient, equilibrium is carried out to described cell;
When the time for balance coefficient of described cell is invalid value, obtain the consistency coefficient between each cell in described battery pack, according to described consistency coefficient, equilibrium is carried out to described cell.
2. method according to claim 1, is characterized in that, the time for balance coefficient of the cell of described acquisition battery pack, comprising:
Obtain the total run time of described cell and balanced opening time;
According to total run time and the described balanced opening time of described cell, calculate the time for balance coefficient of described cell.
3. method according to claim 1, is characterized in that, described according to described accumulated running time and described time for balance coefficient, carries out equilibrium, comprising described cell:
According to described accumulated running time and described time for balance coefficient, calculate the balanced opening time of described cell;
Control equalizing circuit corresponding to described cell to open, equilibrium is carried out to described cell;
When the opening time of described equalizing circuit reaches the balanced opening time of described cell, control equalizing circuit corresponding to described cell and close.
4. method according to claim 1, is characterized in that, described according to described accumulated running time and described time for balance coefficient, after carrying out equilibrium, also comprises described cell:
Obtain the consistency coefficient between each cell in described battery pack;
Judge whether the consistency coefficient between described each cell is greater than or equal to preset value;
If the consistency coefficient between described each cell is greater than or equal to preset value, then remove described time for balance coefficient;
If the consistency coefficient between described each cell is less than preset value, then store described time for balance coefficient.
5. method according to claim 1, is characterized in that, described according to described consistency coefficient, carries out equilibrium, comprising described cell:
Judge whether the consistency coefficient between described each cell is less than preset value;
If the consistency coefficient between described each cell is less than preset value, then equilibrium is carried out to described cell, and again obtain the time for balance coefficient of described cell.
6. a battery balanced controller, is characterized in that, comprising:
Acquisition module, for obtaining the time for balance coefficient of the cell of battery pack;
Judge module, for judging whether the time for balance coefficient of described cell is effective value;
First balance module, for when the time for balance coefficient of described cell is effective value, obtains the accumulated running time of described cell, according to described accumulated running time and described time for balance coefficient, carries out equilibrium to described cell;
Second balance module, for when the time for balance coefficient of described cell is invalid value, obtains the consistency coefficient between each cell in described battery pack, according to described consistency coefficient, carries out equilibrium to described cell.
7. controller according to claim 6, is characterized in that, described acquisition module comprises:
Acquiring unit, for obtaining the total run time of described cell and balanced opening time;
First computing unit, for according to the total run time of described cell and described balanced opening time, calculates the time for balance coefficient of described cell.
8. controller according to claim 6, is characterized in that, described first balance module comprises:
Second computing unit, for according to described accumulated running time and described time for balance coefficient, calculates the balanced opening time of described cell;
Control unit, opening for controlling equalizing circuit corresponding to described cell, carrying out equilibrium to described cell; Also for, when the opening time of described equalizing circuit reaches the balanced opening time of described cell, control equalizing circuit corresponding to described cell and close.
9. controller according to claim 6, is characterized in that, described second balance module comprises:
Judging unit, for judging whether the consistency coefficient between described each cell is less than preset value;
Balanced unit, if be less than preset value for the consistency coefficient between described each cell, then carries out equilibrium to described cell, and again obtains the time for balance coefficient of described cell.
10. a battery pack, is characterized in that, comprising: multiple cell, multiple equalizing circuit, band EEPROM (Electrically Erasable Programmable Read Only Memo) EEPROM and the battery balanced controller described in any one of claim 6 ~ 9;
Equalizing circuit and cell one_to_one corresponding;
The cell that equalizing circuit is corresponding with it respectively connects, and described battery balanced controller is connected with described EEPROM and described multiple equalizing circuit respectively;
Described EEPROM is for storing accumulated running time and the time for balance coefficient of each cell;
Described battery balanced controller carries out equilibrium for controlling the equalizing circuit pair cell corresponding with it.
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| CN102361100A (en) * | 2011-10-19 | 2012-02-22 | 奇瑞汽车股份有限公司 | Method for controlling balance of power lithium ion battery |
| JP2012070562A (en) * | 2010-09-24 | 2012-04-05 | Sumitomo Electric Ind Ltd | Secondary cell charge and discharge device and power storage system |
| CN103812150A (en) * | 2012-11-08 | 2014-05-21 | 国家电网公司 | Cell equalization method and device |
| CN104364116A (en) * | 2012-08-08 | 2015-02-18 | 丰田自动车株式会社 | Electrical storage system and equalizing method |
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| JP2012070562A (en) * | 2010-09-24 | 2012-04-05 | Sumitomo Electric Ind Ltd | Secondary cell charge and discharge device and power storage system |
| CN102361100A (en) * | 2011-10-19 | 2012-02-22 | 奇瑞汽车股份有限公司 | Method for controlling balance of power lithium ion battery |
| CN104364116A (en) * | 2012-08-08 | 2015-02-18 | 丰田自动车株式会社 | Electrical storage system and equalizing method |
| CN103812150A (en) * | 2012-11-08 | 2014-05-21 | 国家电网公司 | Cell equalization method and device |
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