CN103683403B - The balance method of battery capacity of battery system, device and pure electric automobile - Google Patents
The balance method of battery capacity of battery system, device and pure electric automobile Download PDFInfo
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- CN103683403B CN103683403B CN201310648452.6A CN201310648452A CN103683403B CN 103683403 B CN103683403 B CN 103683403B CN 201310648452 A CN201310648452 A CN 201310648452A CN 103683403 B CN103683403 B CN 103683403B
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000009467 reduction Effects 0.000 claims description 41
- 238000007600 charging Methods 0.000 claims description 18
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 12
- 238000012795 verification Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 229910052493 LiFePO4 Inorganic materials 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 239000005955 Ferric phosphate Substances 0.000 abstract description 8
- 229940032958 ferric phosphate Drugs 0.000 abstract description 8
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 abstract description 8
- 229910000399 iron(III) phosphate Inorganic materials 0.000 abstract description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 16
- 229910001416 lithium ion Inorganic materials 0.000 description 16
- 239000011449 brick Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010277 constant-current charging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010280 constant potential charging Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention provides a kind of balance method of battery capacity of battery system, comprising: 1) described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff; 2) each cell that when selecting charge cutoff, in battery system, voltage is higher, carries out equalization discharge to each cell selected successively or simultaneously; 3) again described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff; 4) judge whether described battery system meets balanced cut-off condition according to the voltage of cells all in battery system during charge cutoff, in this way, then judge balanced end, as no, then return step 2).Correspondingly, a kind of battery capacity balancer and pure electric automobile of battery system are provided.The balance method of battery capacity of battery system of the present invention and device simply, effectively can carry out battery capacity equilibrium to ferric phosphate lithium cell.
Description
Technical field
The present invention relates to pure electric automobile battery system technical field, be specifically related to a kind of balance method of battery capacity of battery system, device and pure electric automobile.
Background technology
Existing pure electric automobile generally adopts lithium ion battery as actuating force, the positive electrode of lithium ion battery has a variety of, mainly contain cobalt acid lithium, LiMn2O4, lithium nickelate, ter-polymers, LiFePO4 etc., wherein the advantage such as ferric phosphate lithium cell security performance is high, the life-span is long because having, high-temperature behavior is good, capacity is large, memory-less effect, lightweight, environmental protection and being widely used in pure electric automobile.
Because the rated voltage of lithium ion single battery only has 3.2V, and the rated voltage of electrokinetic cell that pure electric automobile uses can be met generally at more than 300V, so electrokinetic cell adopts usually by multiple lithium ion single battery by going here and there and connecting the power brick (i.e. battery system) assembled, therefore the consistency difference between each lithium ion single battery in power brick can have a strong impact on the performances such as the life-span of power brick.
For the characteristic of lithium ion battery itself, in power brick, the performance of each lithium ion single battery cannot reach completely the same.First, the production technology of lithium ion battery inherently can cause that the capacity of each lithium ion battery is inconsistent, resistance is inconsistent and voltage is inconsistent; Secondly, although all can screen wherein each lithium ion single battery before assembled battery bag, to screen out the cell of consistency difference, thus strengthen matching degree, but the inconsistent of power brick running environment also can cause the consistency difference wherein between each lithium ion single battery to increase; Again, power brick in use, because the rate of decay of wherein each lithium ion single battery capacity is different, inconsistent its working temperature that causes of the internal resistance of each lithium ion single battery is different, therefore cause the depth of discharge of each lithium ion single battery different, circulation like this worsens, and makes the difference of each lithium ion single battery initial performance parameter constantly accumulate and amplify, causes the performance of power brick constantly to decline.
In order to solve the problem, prior art proposes the scheme adopting vehicle-mounted equalizer to realize battery capacity equilibrium, but this scheme is not too applicable to ferric phosphate lithium cell.Because the flash-over characteristic of ferric phosphate lithium cell is: discharge curve has good discharge platform, and the battery capacity of platform section accounts for 80% of total battery capacity, therefore battery capacity and cell voltage or other battery parameters easily obtained there is no good corresponding relation.If adopt existing vehicle-mounted equalizer to carry out battery capacity real time equaliser to ferric phosphate lithium cell, then in balance policy and equalization algorithm, be proposed strict requirement, and real time equaliser requires that each balanced battery capacity is less, this just requires that equalization algorithm must be very accurate, be unfavorable for applying, therefore existing scheme is not too applicable to ferric phosphate lithium cell.
To sum up, need one at present badly and carry out battery capacity equilibrium and simple, effective method for ferric phosphate lithium cell.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned defect existing in prior art, provides one can carry out battery capacity balanced and simple, effective equalization methods, balancer and pure electric automobile to ferric phosphate lithium cell.
Solve the technical scheme that the technology of the present invention problem adopts:
The balance method of battery capacity of described battery system comprises the steps:
1) described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff;
2) each cell that when selecting charge cutoff, in battery system, voltage is higher, carries out equalization discharge to each cell selected successively or simultaneously;
3) again described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff;
4) judge whether described battery system meets balanced cut-off condition according to the voltage of cells all in battery system during charge cutoff, in this way, then judge balanced end, as no, then return step 2).
Preferably, in step 1) and step 3), constant-current constant-voltage charging method is adopted to charge to described battery system;
In step 4), judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff:
Judge whether described battery system meets current cut-off condition according to the voltage of cells all in battery system during charge cutoff, or judge whether described battery system meets the first pressure reduction preset according to the voltage of cells all in battery system during charge cutoff.
Preferably, in step 1) and step 3), constant current charge method or constant voltage charge method is adopted to charge to described battery system;
In step 4), judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff:
Judge whether described battery system meets the first pressure reduction preset according to the voltage of cells all in battery system during charge cutoff.
Preferably, described method also comprises carries out verification step to equilibrium result, is specially:
5) at the end of judgement equilibrium, described battery system is discharged until cut-off of discharging, and record the voltage of all cells when electric discharge ends;
6) judge whether described battery system meets the second pressure reduction preset according to the voltage of all cells in battery system during electric discharge cut-off, in this way, then decision verification terminates, and as no, then select each cell of low voltage in battery system when electric discharge ends and is replaced by new battery.
The present invention also provides a kind of battery capacity balancer of battery system, and described battery system comprises multiple cell, and described device comprises: charhing unit, the first record cell, first select unit, balanced unit and the first judging unit;
Described charhing unit is used for charging until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is for recording charge cutoff, and export first to and select unit;
Described first selects each cell that when unit selects charge cutoff for the voltage of all cells according to the first recording unit records, in battery system, voltage is higher;
Described balanced unit is used for carrying out equalization discharge to each cell selected successively or simultaneously;
Described charhing unit, also for after balanced unit completes equalization discharge, continues to charge until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is also for recording charge cutoff, and export first respectively to and select unit and the first judging unit;
Described first judging unit is used for the voltage according to all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition, in this way, then judge balanced end, as no, then first select unit, balanced unit, charhing unit and the first record cell and repeat respective work successively, until the first judging unit judges balanced end.
Preferably, described charhing unit adopts constant-current constant-voltage charging method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets current cut-off condition, or the voltage of all cells according to the first recording unit records, when judging charge cutoff, whether described battery system meets the first pressure reduction preset.
Preferably, described charhing unit adopts constant current charge method or constant voltage charge method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, and when judging charge cutoff, whether described battery system meets the first pressure reduction preset.
Preferably, also comprise: discharge cell, the second record cell, the second judging unit, second select unit and replacement unit;
Described discharge cell is used for, at the end of the first judging unit judges equilibrium, discharging to described battery system, until electric discharge cut-off;
Described second record cell for recording the voltage of all cells when electric discharge ends, and exports the second judging unit to;
Described second judging unit is used for the voltage according to all cells of the second recording unit records, when judging to discharge cut-off, whether described battery system meets the second pressure reduction preset, and in this way, then decision verification terminates, as no, then output signal to second and select unit;
Described second selects unit for after the signal receiving the second judging unit output, selects each cell of low voltage in battery system when electric discharge ends;
Each cell that described replacement unit is used for selecting second low voltage that unit is selected is replaced by new battery.
Preferably, described battery system is the battery system of LiFePO4 system.
The present invention also provides a kind of pure electric automobile comprising the battery capacity balancer of above-mentioned battery system.
Beneficial effect:
The balance method of battery capacity of battery system of the present invention (i.e. power brick) and device, first battery system is charged, then under the state of the full electricity of battery system, (when namely battery system is in charge cutoff state) carries out equalization discharge to it, circulation like this is repeatedly until battery system meets balanced cut-off condition, to improve the consistency in battery system between each cell, visible the present invention does not need very accurately algorithm just can realize the capacity equilibrium in battery system between each cell, simple to operate, effective, the useful life of battery system can also be extended, thus lithium iron phosphate battery system is specially adapted to.
Accompanying drawing explanation
Fig. 1 is the flow chart of the balance method of battery capacity of battery system described in the embodiment of the present invention 1;
Fig. 2 is voltage waveform when adopting constant-current constant-voltage charging method to charge to battery system in the embodiment of the present invention 1 and current waveform schematic diagram;
Fig. 3 is the flow chart of the balance method of battery capacity of battery system described in the embodiment of the present invention 2;
Fig. 4 carries out charging to battery system in the embodiment of the present invention 2 the magnitude of voltage schematic diagram of forward and backward each cell;
Fig. 5 is when verifying equilibrium result in the embodiment of the present invention 2, and cell contained by battery system all meets discharge curve schematic diagram during the second pressure reduction preset;
Fig. 6 is when verifying equilibrium result in the embodiment of the present invention 2, and battery system contains the discharge curve schematic diagram during cell not meeting the second pressure reduction preset;
Fig. 7 is the structural representation of the battery capacity balancer of battery system described in the embodiment of the present invention 3;
Fig. 8 is the structural representation of the battery capacity balancer of battery system described in the embodiment of the present invention 4.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with drawings and Examples, the balance method of battery capacity of battery system of the present invention, device and pure electric automobile are described in further detail.
Embodiment 1:
As shown in Figure 1, the present embodiment provides a kind of balance method of battery capacity of battery system, described battery system comprises multiple cell, because the structure of battery system belongs to prior art, therefore the connected mode of multiple cells wherein also belongs to prior art, can by those skilled in the art according to the actual requirements with series connection, or the mode such as connection in series-parallel combination is assembled, and does not repeat them here.
Described method comprises the steps:
S101. charge until charge cutoff to described battery system, to make battery system be in full power state, and the voltage of all cells in battery system when recording charge cutoff.
Because described battery system can be used in automobile, therefore external 220V power supply can be adopted to charge to automobile thus charge to battery system, and can adopt in battery system charging process (starting to charge cutoff from charging) that the battery management system (BMS) of automobile is real-time be detected and record the voltage of all cells in the global voltage of battery system and battery system.
Each cell that when s102. selecting charge cutoff, in battery system, voltage is higher, carries out equalization discharge to each cell selected successively or simultaneously.
In described step s102, each cell that when selecting charge cutoff, in battery system, voltage is higher is specially:
Pre-set upper voltage limit value, when charge cutoff, if the voltage of the one or more cells in battery system is greater than default described upper voltage limit value, then judge that described one or more cell is as the higher cell of voltage, and select the numbering of the higher described one or more cell of voltage.Wherein, described upper voltage limit value can by those skilled in the art's sets itself according to the actual requirements.
In described step s102, successively or equalization discharge is carried out to each cell selected simultaneously and be specially:
S102-1. the capacity of the required electric discharge of each cell selected is calculated respectively:
(described initial charge curve can be provided by cell production companies the initial charge curve of the cell that reference is identical with the model of each cell selected, and the voltage of cell and the corresponding relation of capacity during charge cutoff known according to initial charge curve), the capacity of each cell selected when calculating charge cutoff respectively according to described initial charge curve and the difference of the capacity mean value of each cell (other cells) be not selected, this difference i.e. capacity of required electric discharge;
S102-2. equalization discharge:
The capacity discharged needed for each cell described in calculating, when battery system charge cutoff, (when battery system is in full power state) adopts existing equalizer or load to carry out equalization discharge to each cell described successively or simultaneously, to eliminate unnecessary capacity, namely, the capacity discharged needed for each cell described is discharged, instead of transfers on each cell of not being selected.
S103. again described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff.
S104. judge whether described battery system meets balanced cut-off condition according to the voltage of cells all in battery system during charge cutoff, in this way, then judge balanced end, terminate to safeguard, as no, then return step s102.
Preferably, in step s101 and step s103, constant current constant voltage (CC/CV) mise-a-la-masse method is adopted to charge to described battery system.
Voltage waveform when adopting constant-current constant-voltage charging method to charge to battery system and current waveform are as shown in Figure 2, described constant-current constant-voltage charging method comprises two charging stages, first stage is constant-current charging phase, namely the charging stage on the left of dotted line is positioned in Fig. 2, this stage charging current remains unchanged, and charging voltage constantly increases, until rise to upper voltage limit value (described upper voltage limit value can by those skilled in the art's sets itself according to the actual requirements), then second stage is entered, second stage is constant voltage charging phase, namely the charging stage on the right side of dotted line is positioned in Fig. 2, this stage charging voltage remains upper voltage limit value, and charging current reduces gradually, until drop to floor level of electric current (described floor level of electric current can by those skilled in the art's sets itself according to the actual requirements), now battery system is full of, charging terminates.The advantage of employing constant-current constant-voltage charging method is: at the end of constant-current charging phase, the electrochemical polarization degree of battery system inside still remains on the level identical with constant-current charging phase process, therefore battery system underfill just reaches upper voltage limit value, and constant voltage charging phase makes the concentration polarization of battery system inner ion (such as lithium ion) eliminate gradually, battery system is full of, and the transport number of its intermediate ion and speed show as the reduction gradually of charging current.
Preferably, when adopting constant-current constant-voltage charging method to charge to battery system, judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff:
Judge whether described battery system meets current cut-off condition according to the voltage of cells all in battery system during charge cutoff, or judge whether described battery system meets the first pressure reduction (pressure reduction during charge cutoff) preset according to the voltage of cells all in battery system during charge cutoff.The voltage difference that whether satisfied the first pressure reduction preset of described battery system refers between every two cells in battery system is all in the first default pressure differential range.
Wherein, described battery system meets the electric current of battery system when current cut-off condition refers to charge cutoff and is down to 0.05C, and C represents the rated capacity of battery system; Described the first default pressure reduction can by those skilled in the art's sets itself according to the actual requirements.
Preferably, in step s101 and step s103, constant current charge method or constant voltage charge method is adopted to charge to described battery system; Judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff: judge whether described battery system meets the first pressure reduction preset according to the voltage of cells all in battery system during charge cutoff.
Preferably, described battery system is the battery system of LiFePO4 system.
Equalization methods described in the present embodiment can realize the equalized maintenance of battery system simply and effectively, does not also need point-device equalization algorithm, is thus applicable to on-vehicle battery system, and is specially adapted to the on-vehicle battery system of LiFePO4 system.Equalization methods described in the present embodiment is adopted to make regular check on on-vehicle battery system and safeguard, within such as 1 year, carry out full maintenance or travel certain milimeter number safeguarding, thus the performance of battery system can be recovered in time, improve the useful life of battery system.
Embodiment 2:
As shown in Figure 3, the present embodiment provides a kind of balance method of battery capacity of battery system, comprises the steps:
S201 ~ s204 is identical with step s101 ~ s104, repeats no more.
S205. at the end of judgement equilibrium, described battery system is discharged until cut-off of discharging, and record the voltage of all cells when electric discharge ends.
Similarly, can adopt in battery system discharge process (starting to electric discharge cut-off from electric discharge) that the battery management system (BMS) of automobile is real-time be detected and record the voltage of all cells in the global voltage of battery system and battery system.
S206. judge whether described battery system meets the second pressure reduction (pressure reduction during electric discharge cut-off) preset, and in this way, then decision verification terminates, and terminates to safeguard, as no, then performs step s207 according to the voltage of all cells in battery system during electric discharge cut-off.
Wherein, the voltage difference that whether described battery system meets between every two cells that the second pressure reduction preset refers in battery system is all in the second default pressure differential range; Described the second default pressure reduction can by those skilled in the art's sets itself according to the actual requirements.
S207. select each cell of low voltage in battery system when electric discharge ends and be replaced by new battery, terminating to safeguard.
In described step s207, each cell selecting low voltage in battery system when electric discharge ends is specially:
Predeterminated voltage lower limit, when discharging cut-off, if the voltage of the one or more cells in battery system is less than default described voltage lower limit value, then judge the cell of described one or more cell as low voltage, and select the numbering of described one or more cell of low voltage.Wherein, described voltage lower limit value can by those skilled in the art's sets itself according to the actual requirements.
In described step s207, be replaced by new battery to be specially: when the electric discharge selected being ended, in battery system, each cell of low voltage is replaced by new cell respectively, or in battery system, each cell place battery module of low voltage is replaced by new battery module when the electric discharge selected being ended.
Visible, step s205 and s206 is to step s201 ~ s204(and step s101 ~ s104) step verified of the capacity equilibrium result of battery system that draws, to check portfolio effect further.
The battery system carried for the instruction carriage of New Energy Corporation of Cherry below describes equalization methods described in the present embodiment in detail.Described battery system comprises 1560 cells, and wherein the annexation of cell is 15 and 104 strings, the rated capacity 60Ah of described battery system.
Described equalization methods is specially:
S301. external 220V power supply is adopted to charge to pure electric automobile with constant-current constant-voltage charging method, thus charge until charge cutoff to the battery system in pure electric automobile, and the battery management system in pure electric automobile (BMS) is adopted to record the voltage of all cells of battery system in charging process.Before the charging recorded starts, after charge cutoff, the magnitude of voltage of each cell as shown in Figure 4.
When s302. selecting charge cutoff according to Fig. 4, in battery system, the numbering of each cell that voltage is higher is (such as, compared with most of cell, pressure reduction exceeds the numbering of those cells of 150mV), for Fig. 4, select 38#, 91# ~ 96# cell, and (there is exception in 27# cell to get rid of 27# cell according to designated program, equalization discharge cannot be carried out to it, need directly to be replaced by new battery, abnormal battery select and method for removing belongs to prior art, the present invention no longer describes in detail) successively or simultaneously equalization discharge is carried out to each cell selected, for Fig. 4, 91# ~ 96# cell is discharged 2Ah successively, accurate Calculation discharge capacity is not needed herein to 38# cell electric discharge 1Ah().
S303. again adopt external 220V power supply to charge until charge cutoff to described battery system with constant-current constant-voltage charging method, and adopt the voltage of all cells of battery system in the battery management system record charging process in pure electric automobile.
S304. judge whether described battery system meets current cut-off condition according to the voltage of cells all in battery system during charge cutoff, or whether described battery system meets the first pressure reduction preset, in this way, then balanced end is judged, as no, then perform step s305.Described battery system meets current cut-off condition and refers to: during charge cutoff, the electric current of battery system is down to 0.05C, and C represents the rated capacity of battery system; Described battery system meets the first default pressure reduction and refers to: the voltage of certain cell reaches 3.7V, and the pressure reduction of each cell is not more than 150mV.It should be noted that, balanced two decision conditions whether terminated, the first pressure reduction whether meeting current cut-off condition and preset, with being as the criterion of first reaching.
S305., at the end of judgement equilibrium, described battery system is discharged until cut-off of discharging, and adopt the voltage of all cells of battery system in the battery management system record discharge process in pure electric automobile.
S306. judge whether described battery system meets the second pressure reduction (pressure reduction during electric discharge cut-off) preset according to the voltage of all cells in battery system during electric discharge cut-off, in this way, then decision verification terminates, cell contained by battery system all meet preset the second pressure reduction time discharge curve schematic diagram as shown in Figure 5, as no, each cell then selecting low voltage in battery system when electric discharge ends (is selected compared with most of cell, pressure reduction exceeds those cells of the second pressure differential range) and be replaced by new battery, battery system contains discharge curve schematic diagram when not meeting the cell of the second pressure reduction preset as shown in Figure 6.Described the second default pressure reduction is 350mV; Battery system meets the second default pressure reduction and refers to: the voltage difference between every two cells in battery system is all within the scope of 350mV.
Additive method in the present embodiment and effect all identical with embodiment 1, repeat no more here.
Embodiment 3:
As shown in Figure 7, the present embodiment provides a kind of battery capacity balancer of battery system (described balancer is corresponding with equalization methods described in embodiment 1), described battery system comprises multiple cell, and described balancer comprises: charhing unit, the first record cell, first select unit, balanced unit and the first judging unit;
Described charhing unit is used for charging until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is for recording charge cutoff, and export first to and select unit;
Described first selects each cell that when unit selects charge cutoff for the voltage of all cells according to the first recording unit records, in battery system, voltage is higher;
Described balanced unit is used for carrying out equalization discharge to each cell selected successively or simultaneously;
Described charhing unit, also for after balanced unit completes equalization discharge, continues to charge until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is also for recording charge cutoff, and export first respectively to and select unit and the first judging unit;
Described first judging unit is used for the voltage according to all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition, in this way, then judge balanced end, as no, then first select unit, balanced unit, charhing unit and the first record cell and repeat respective work successively, until the first judging unit judges balanced end.
Preferably, described charhing unit adopts constant-current constant-voltage charging method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets current cut-off condition, or the voltage of all cells according to the first recording unit records, when judging charge cutoff, whether described battery system meets the first pressure reduction (pressure reduction during charge cutoff) preset.
Or described charhing unit adopts constant current charge method or constant voltage charge method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, and when judging charge cutoff, whether described battery system meets the first pressure reduction preset.
Preferably, described battery system is the battery system of LiFePO4 system.
The present embodiment also provides a kind of pure electric automobile comprising the battery capacity balancer of above-mentioned battery system.
Embodiment 4:
As shown in Figure 8, the present embodiment provides a kind of battery capacity balancer of battery system (described balancer is corresponding with equalization methods described in embodiment 2), and the difference of balancer described in balancer described in the present embodiment and embodiment 3 is:
Also comprise discharge cell, the second record cell, the second judging unit, second select unit and replacement unit;
Described discharge cell is used for, at the end of the first judging unit judges equilibrium, discharging to described battery system, until electric discharge cut-off;
Described second record cell for recording the voltage of all cells when electric discharge ends, and exports the second judging unit to;
Described second judging unit is used for the voltage according to all cells of the second recording unit records, when judging to discharge cut-off, whether described battery system meets the second pressure reduction (pressure reduction during electric discharge cut-off) preset, in this way, then decision verification terminates, as no, then output signal to second and select unit;
Described second selects unit for after the signal receiving the second judging unit output, selects each cell of low voltage in battery system when electric discharge ends;
Each cell that described replacement unit is used for selecting second low voltage that unit is selected is replaced by new battery.
The present embodiment also provides a kind of pure electric automobile comprising the battery capacity balancer of above-mentioned battery system.
Other structures in the present embodiment and effect all identical with embodiment 3, repeat no more here.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (9)
1. a balance method of battery capacity for battery system, described battery system comprises multiple cell, it is characterized in that, described method comprises the steps:
1) described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff;
2) each cell that when selecting charge cutoff, in battery system, voltage is higher, carries out equalization discharge to each cell selected successively or simultaneously;
3) again described battery system is charged until charge cutoff, and the voltage of all cells in battery system when recording charge cutoff;
4) judge whether described battery system meets balanced cut-off condition according to the voltage of cells all in battery system during charge cutoff, in this way, then judge balanced end, as no, then return step 2);
Described method also comprises carries out verification step to equilibrium result, is specially:
5) at the end of judgement equilibrium, described battery system is discharged until cut-off of discharging, and record the voltage of all cells when electric discharge ends;
6) judge whether described battery system meets the second pressure reduction preset according to the voltage of all cells in battery system during electric discharge cut-off, in this way, then decision verification terminates, and as no, then select each cell of low voltage in battery system when electric discharge ends and is replaced by new battery.
2. method according to claim 1, is characterized in that,
In step 1) and step 3) in, adopt constant-current constant-voltage charging method to charge to described battery system;
In step 4) in, judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff:
Judge whether described battery system meets current cut-off condition according to the voltage of cells all in battery system during charge cutoff, or judge whether described battery system meets the first pressure reduction preset according to the voltage of cells all in battery system during charge cutoff.
3. method according to claim 1, is characterized in that,
In step 1) and step 3) in, adopt constant current charge method or constant voltage charge method to charge to described battery system;
In step 4) in, judge whether described battery system meets balanced cut-off condition and be specially according to the voltage of cells all in battery system during charge cutoff:
Judge whether described battery system meets the first pressure reduction preset according to the voltage of cells all in battery system during charge cutoff.
4. the method according to any one of claims 1 to 3, is characterized in that, described battery system is the battery system of LiFePO4 system.
5. a battery capacity balancer for battery system, described battery system comprises multiple cell, it is characterized in that, described device comprises: charhing unit, the first record cell, first select unit, balanced unit and the first judging unit;
Described charhing unit is used for charging until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is for recording charge cutoff, and export first to and select unit;
Described first selects each cell that when unit selects charge cutoff for the voltage of all cells according to the first recording unit records, in battery system, voltage is higher;
Described balanced unit is used for carrying out equalization discharge to each cell selected successively or simultaneously;
Described charhing unit, also for after balanced unit completes equalization discharge, continues to charge until charge cutoff to described battery system;
The voltage of all cells in battery system when described first record cell is also for recording charge cutoff, and export first respectively to and select unit and the first judging unit;
Described first judging unit is used for the voltage according to all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition, in this way, then judge balanced end, as no, then first select unit, balanced unit, charhing unit and the first record cell and repeat respective work successively, until the first judging unit judges balanced end;
Described device also comprises: discharge cell, the second record cell, the second judging unit, second select unit and replacement unit;
Described discharge cell is used for, at the end of the first judging unit judges equilibrium, discharging to described battery system, until electric discharge cut-off;
Described second record cell for recording the voltage of all cells when electric discharge ends, and exports the second judging unit to;
Described second judging unit is used for the voltage according to all cells of the second recording unit records, when judging to discharge cut-off, whether described battery system meets the second pressure reduction preset, and in this way, then decision verification terminates, as no, then output signal to second and select unit;
Described second selects unit for after the signal receiving the second judging unit output, selects each cell of low voltage in battery system when electric discharge ends;
Each cell that described replacement unit is used for selecting second low voltage that unit is selected is replaced by new battery.
6. device according to claim 5, is characterized in that,
Described charhing unit adopts constant-current constant-voltage charging method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets current cut-off condition, or the voltage of all cells according to the first recording unit records, when judging charge cutoff, whether described battery system meets the first pressure reduction preset.
7. device according to claim 5, is characterized in that,
Described charhing unit adopts constant current charge method or constant voltage charge method to charge to described battery system;
Described first judging unit is according to the voltage of all cells of the first recording unit records, when judging charge cutoff, whether described battery system meets balanced cut-off condition and is specially: according to the voltage of all cells of the first recording unit records, and when judging charge cutoff, whether described battery system meets the first pressure reduction preset.
8. the device according to any one of claim 5 ~ 7, is characterized in that, described battery system is the battery system of LiFePO4 system.
9. a pure electric automobile, comprises the battery capacity balancer of the battery system according to any one of claim 5 ~ 8.
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| CN105762869A (en) * | 2016-03-30 | 2016-07-13 | 张家港绿锂动力技术有限公司 | Battery pack equalization control method and system |
| CN106711521B (en) * | 2016-11-16 | 2019-05-07 | 安徽锐能科技有限公司 | Battery pack balancing control method and control circuit |
| CN108513689A (en) * | 2017-03-30 | 2018-09-07 | 深圳市大疆创新科技有限公司 | Charge control method, system, charger, intelligent battery and moveable platform |
| CN111864844B (en) * | 2020-07-27 | 2022-03-08 | 中创新航科技股份有限公司 | Equalization method and equalization device of battery system and intelligent equipment |
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| CN101563827A (en) * | 2006-12-14 | 2009-10-21 | 松下电器产业株式会社 | Battery pack control method, battery pack control circuit, charging circuit equipped with the battery pack control circuit, and battery assembly |
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