CN104600760B - The cell balance control method of set of cells and system - Google Patents
The cell balance control method of set of cells and system Download PDFInfo
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- CN104600760B CN104600760B CN201310526210.XA CN201310526210A CN104600760B CN 104600760 B CN104600760 B CN 104600760B CN 201310526210 A CN201310526210 A CN 201310526210A CN 104600760 B CN104600760 B CN 104600760B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005611 electricity Effects 0.000 claims description 25
- 239000000178 monomer Substances 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 238000013507 mapping Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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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- H02J7/0086—
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- H02J7/0091—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present invention proposes the cell balance control method of a kind of set of cells, including: gather the terminal voltage of multiple cells in set of cells；Terminal voltage according to multiple cells obtains the average terminal voltage of set of cells；The first balance unlatching threshold value that the predeterminated voltage interval at average terminal voltage place is corresponding is obtained from multiple continuous print predeterminated voltage intervals；Average terminal voltage according to terminal voltage and set of cells judges whether the cell needing to carry out electric quantity balancing；If it is present open threshold value to needing the cell carrying out electric quantity balancing to carry out electric quantity balancing according to the first balance.The cell balance control method of the set of cells according to the present invention, the balance selecting different electric quantity balancings for different set of cells average terminal voltage opens threshold value, effectively avoid the interference brought due to the non-linear relation of cell state-of-charge Yu terminal voltage, make correct electric quantity balancing and determine.The present invention also proposes the cell balance control system of a kind of set of cells.
Description
Technical field
The present invention relates to power battery technology field, particularly to the cell balance control method of a kind of set of cells and be
System.
Background technology
In the power battery pack being composed in series by multiple cells, cell there are differences the most unavoidably,
Simultaneously during the use of set of cells, the heat radiation of each cell and discharge and recharge etc. there is also difference, which results in each
Terminal voltage between cell is different, the most so-called cell energy imbalance.If unbalance set of cells is not entered in time
Row electric quantity balancing, can cause the terminal voltage difference between cell increasing, thus cause the deterioration of battery performance and make
With the reduction in life-span, therefore the electric quantity balancing of cell is particularly important.
In the electric quantity balancing technology of current cell, generally select cell SOC (State of Charge, charged
State) or terminal voltage as the foundation of electric quantity balancing.The state-of-charge of the cell of lithium battery exists such as Fig. 1 with terminal voltage
Shown nonlinear mapping relation curve.
When the state-of-charge of certain cell or terminal voltage and when differing greatly of other cell in set of cells, i.e. occur
Energy imbalance, it is necessary to this cell is carried out electric quantity balancing, it includes two kinds of situations, charged when certain cell
When state or terminal voltage are apparently higher than other cell, now need to discharge to reach new electricity to this cell
Balance；When the state-of-charge of certain cell or terminal voltage are significantly lower than other cell, now need this monomer electricity
Pond is charged reaching new electric quantity balancing.
The state-of-charge of cell directly reflects the number of cell current residual electricity, is as electric quantity of single batteries
The first-selected key element of balance foundation.But, the estimation to cell state-of-charge is extremely complex, and present stage state-of-charge
Estimation error is typically more than 5%.In the case of state-of-charge estimation precision is not high enough, if still selecting cell lotus
Electricity condition, as the foundation of electric quantity balancing, will make the electric quantity balancing made mistake and determine, thus run counter to desire, cause monomer electricity
Difference between pond is increasing.
Therefore, actual application is more the foundation selecting the terminal voltage of cell to balance as electric quantity of single batteries.With end
Voltage is the general the following two kinds mode that uses of electric quantity balancing control of foundation: 1) terminal voltage when between any two cell is poor
When value exceedes setting threshold value；2) when the terminal voltage of any one cell and the difference of average terminal voltage exceed setting threshold value.
Above-mentioned electric quantity balancing mode does not accounts for the non-linear relation existed between cell state-of-charge and terminal voltage.
The state-of-charge of lithium battery as shown in Figure 1 understands, when the charged shape of cell with the nonlinear mapping relation curve of terminal voltage
When state is higher or lower, the slope of curve is relatively big, and when cell state-of-charge is near 50%, the slope of curve substantially becomes
Little.Therefore, it can open when the cell utilizing fixed threshold to select to need electric quantity balancing, such as difference are 0.1V electricity
Amount balance, but can there are the following problems: when set of cells average terminal voltage is higher, such as 4.1V, if a certain cell
When being 0.1V with the difference of average terminal voltage, owing to the now slope of curve is big, i.e. the state-of-charge of this cell and set of cells
State-of-charge difference and little, it is not necessary to open electric quantity balancing；When set of cells average voltage is near 3.7V, if certain
When the terminal voltage of one cell and the difference of average terminal voltage are 0.1V, owing to now the slope of curve is less, namely this monomer
The state-of-charge of battery differs greatly with the state-of-charge of set of cells, needs to open electric quantity balancing.As can be seen here, selection is fixing
Threshold value decides whether that opening electric quantity balancing has some limitations.
Summary of the invention
It is contemplated that at least solve one of above-mentioned technical problem.
To this end, the first of the present invention purpose is to propose the cell balance control method of a kind of set of cells, the method can
With select for different set of cells average terminal voltage different electric quantity balancings balance open threshold value, effectively avoid due to
The interference that the non-linear relation of cell state-of-charge and terminal voltage is brought, makes correct electric quantity balancing and determines.
Second object of the present invention is to propose the cell balance control system of a kind of set of cells.
To achieve these goals, the embodiment of first aspect of the present invention proposes the cell balance control of a kind of set of cells
Method processed, described set of cells includes multiple cells of series connection, said method comprising the steps of: gather described set of cells
In the terminal voltage of multiple cells；Terminal voltage according to multiple described cells obtains the average terminal voltage of described set of cells；
The first balance obtaining the predeterminated voltage interval at described average terminal voltage place from multiple continuous print predeterminated voltage intervals corresponding is opened
Opening threshold value, wherein, the balance that the predeterminated voltage interval of the both sides that the plurality of continuous print predeterminated voltage is interval is corresponding opens threshold value
The balance that the predeterminated voltage interval of the centre interval more than the plurality of continuous print predeterminated voltage is corresponding opens threshold value；According to described
The terminal voltage of multiple cells and the average terminal voltage of described set of cells judge whether the monomer needing to carry out electric quantity balancing
Battery；The cell carrying out electric quantity balancing is needed to carry out if it is present open threshold value according to described first balance to described
Electric quantity balancing.
The cell balance control method of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines.
In some instances, the balance that each predeterminated voltage interval is corresponding opens threshold value from the plurality of continuous print predeterminated voltage district
It is positioned at balance corresponding to the second middle predeterminated voltage interval between and opens threshold value to being positioned at described second both sides, predeterminated voltage interval
Balance corresponding to predeterminated voltage interval open threshold value and become larger.
In some instances, the average terminal voltage of the described terminal voltage according to the plurality of cell and described set of cells judges
Whether existence needs to carry out the cell of electric quantity balancing, specifically includes: from the plurality of cell obtain terminal voltage with
First cell of the maximum absolute value of the difference of described average terminal voltage；Compare absolute value and the institute of the difference of described maximum
State the first balance and open threshold value；If the absolute value of the difference of described maximum opens threshold value more than described first balance, then judge
Need described first cell is carried out electric quantity balancing, otherwise judge to there is not the cell needing to carry out electric quantity balancing.
In some instances, according to described first balance unlatching threshold value, the described cell needing to carry out electric quantity balancing is being entered
During row electric quantity balancing, also include the cell stopping described needs are carried out electric quantity balancing when meeting following condition
Carry out electric quantity balancing: the terminal voltage of the plurality of cell exists terminal voltage more than first threshold or terminal voltage less than the
The terminal voltage of two threshold values, described first threshold is more than described Second Threshold；Or, the temperature of described set of cells is pre-higher than first
If temperature or less than the second preset temperature, described first preset temperature is more than described second preset temperature；Or enter described in,
Charge/discharge current during row electric quantity balancing is higher than predetermined current.
As a example by realize above-mentioned purpose, the embodiment of second aspect of the present invention propose a kind of set of cells cell balance control
System processed, described set of cells includes multiple cells of series connection, and described system includes: acquisition module, is used for gathering described
The terminal voltage of multiple cells in set of cells；Computing module, for obtaining institute according to the terminal voltage of multiple described cells
State the average terminal voltage of set of cells；Acquisition module, for obtaining described average end electricity from multiple continuous print predeterminated voltage intervals
The first balance that the predeterminated voltage interval at pressure place is corresponding opens threshold value, wherein, the plurality of continuous print predeterminated voltage interval
The balance that the predeterminated voltage interval of both sides is corresponding opens presetting of the threshold value centre interval more than the plurality of continuous print predeterminated voltage
The balance that voltage range is corresponding opens threshold value；Judge module, for the terminal voltage according to the plurality of cell and described electricity
The average terminal voltage of pond group judges whether the cell needing to carry out electric quantity balancing；And balance module, in institute
State judge module and judge when existence needs the cell carrying out electric quantity balancing, open threshold value to described according to described first balance
The cell carrying out electric quantity balancing is needed to carry out electric quantity balancing.
The cell balance control system of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines.
In some instances, the balance that each predeterminated voltage interval is corresponding opens threshold value from the plurality of continuous print predeterminated voltage district
It is positioned at balance corresponding to the second middle predeterminated voltage interval between and opens threshold value to being positioned at described second both sides, predeterminated voltage interval
Balance corresponding to predeterminated voltage interval open threshold value and become larger.
In some instances, described judge module is for obtaining terminal voltage and described average end electricity from the plurality of cell
First cell of the maximum absolute value of the difference of pressure, and compare the absolute value of described difference and described first balance unlatching threshold
Value, and when the absolute value of described difference opens threshold value more than described first balance, it is determined that need described first monomer electricity
Pond carries out electric quantity balancing, otherwise judges to there is not the cell needing to carry out electric quantity balancing.
In some instances, described balance module is additionally operable to, according to described first balance unlatching threshold value, described needs are being carried out electricity
During the cell of amount balance carries out electric quantity balancing, stop described needs are carried out electricity when judging to meet following condition
The cell of amount balance carries out electric quantity balancing: there is terminal voltage in the terminal voltage of the plurality of cell more than first threshold
Or terminal voltage is more than described Second Threshold less than the terminal voltage of Second Threshold, described first threshold；Or, described set of cells
Temperature higher than the first preset temperature or less than the second preset temperature, described first preset temperature presets temperature more than described second
Degree；Or carry out the charge/discharge current during electric quantity balancing described in, higher than the first predetermined current.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become bright from the following description
Aobvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will be apparent from from combining the accompanying drawings below description to embodiment
With easy to understand, wherein:
Fig. 1 is the state-of-charge nonlinear mapping graph of relation with terminal voltage of the cell of lithium battery；
Fig. 2 is the flow chart of the cell balance control method of set of cells according to an embodiment of the invention；
Fig. 3 is the flow chart of the cell balance control method of set of cells in accordance with another embodiment of the present invention；And
Fig. 4 is the structure chart of the cell balance control system of set of cells according to an embodiment of the invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ",
Orientation or the position relationship of the instruction such as " afterwards ", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or dark
The device or the element that show indication must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint phase
To importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " install ", " being connected ",
" connect " and should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, permissible
It it is the connection of two element internals.For the ordinary skill in the art, can understand that above-mentioned term exists with concrete condition
Concrete meaning in the present invention.
Cell balance control method and the system of set of cells according to an embodiment of the invention are described below in conjunction with accompanying drawing, logical
Cross the method taking balance unlatching threshold value to change with the difference of set of cells average terminal voltage to decide whether to open electric quantity balancing.
Fig. 1 is the state-of-charge nonlinear mapping graph of relation with terminal voltage of the cell of lithium battery, when set of cells is put down
When all terminal voltage is higher or lower, as it is shown in figure 1, owing to the slope of curve is relatively big, therefore select bigger balance to open threshold value electricity
Pressure, average terminal voltage is closer to two ends ultimate value, and the slope of curve is the biggest, and the balance turn-on threshold voltage therefore selected is the highest.
And when set of cells average terminal voltage is in an intermediate position, owing to now the slope of curve is less, slight terminal voltage difference may
Cause the difference of big state-of-charge, therefore the balance turn-on threshold voltage of selection of small.
Fig. 2 is the flow chart of the cell balance control method of set of cells according to an embodiment of the invention, such as Fig. 2 institute
Show, according to an embodiment of the invention the flow chart of the cell balance control method of set of cells, wherein, battery pack
Including multiple cells of series connection, the method comprises the following steps:
Step S101: gather the terminal voltage of multiple cells in set of cells.In one embodiment of the invention, with nominal
As a example by voltage is the lithium battery of 3.7V, describe the cell balance control method of the set of cells of the embodiment of the present invention in detail.
Step S102: obtain the average terminal voltage of set of cells according to the terminal voltage of multiple cells.
Step S103: the predeterminated voltage interval obtaining average terminal voltage place from multiple continuous print predeterminated voltage intervals is corresponding
First balance opens threshold value, and wherein, the balance that the predeterminated voltage interval of the both sides that multiple continuous print predeterminated voltages are interval is corresponding is opened
Open the balance unlatching threshold value that the predeterminated voltage interval of the threshold value centre interval more than multiple continuous print predeterminated voltages is corresponding.Work as battery
When the average terminal voltage of group is in different phase respectively, opens threshold value by balance shown in table 1 and decide whether that carrying out electricity puts down
Weighing apparatus.
Table 1 lithium battery average terminal voltage opens the corresponding table of threshold value with balance
As shown in table 1, in an embodiment of the present invention, the balance that each predeterminated voltage interval is corresponding opens threshold value from multiple companies
Continuous predeterminated voltage interval is positioned at balance corresponding to the second middle predeterminated voltage interval and opens threshold value to being positioned at the second default electricity
The balance that between nip, the predeterminated voltage interval of both sides is corresponding is opened threshold value and is become larger.
Step S104: judge whether that needs are carried out according to the terminal voltage of multiple cells and the average terminal voltage of set of cells
The cell of electric quantity balancing, specifically includes:
The first cell of terminal voltage and the maximum absolute value of the difference of average terminal voltage is obtained from multiple cells.
The absolute value of the most maximum difference and the first balance open threshold value.
If the absolute value of the difference of maximum opens threshold value more than the first balance, then judge to need the first cell is carried out electricity
Amount balance, otherwise judges to there is not the cell needing to carry out electric quantity balancing.
Step S105: if it is present open threshold value to needing the cell carrying out electric quantity balancing to carry out according to the first balance
Electric quantity balancing.
Concrete, after the lithium battery group that nominal voltage is 3.7V is started working, first gather the terminal voltage of each cell also
Calculating the average terminal voltage of set of cells, the average terminal voltage as calculated is 3.1V, now by tabling look-up knowable to 1, averagely holds
Voltage is that to open threshold value be 0.2V for the first balance of the set of cells of 3.1V, now calculates the terminal voltage of each cell and average electricity
The absolute value of the difference of pressure 3.1V, the absolute value if there is a certain cell with the difference of average terminal voltage is more than 0.2V,
Then needing cell is carried out electric quantity balancing, the absolute value if there is the difference of the terminal voltage of multiple cells is all higher than
0.2V, then that cell of the maximum absolute value choosing difference carries out electric quantity balancing, if there is no the absolute value of difference
Cell more than 0.2V does not the most carry out electric quantity balancing.
Here it should be noted that opening threshold value to needing the cell carrying out electric quantity balancing to carry out according to the first balance
During electric quantity balancing, also include that the cell stopping carrying out needs electric quantity balancing when meeting following condition carries out electricity
Amount balance:
The terminal voltage of multiple cells exists terminal voltage electric less than the end of Second Threshold more than first threshold or terminal voltage
Pressure, first threshold is more than Second Threshold, such as when the terminal voltage of some cell is more than 4.2V or is less than 2.8V,
Stop needing the cell carrying out electric quantity balancing to carry out electric quantity balancing.
The temperature of set of cells is higher than the first preset temperature or less than the second preset temperature, the first preset temperature is preset more than second
Temperature, such as, when the operating temperature of set of cells is higher than 50 DEG C or is less than 0 DEG C, stop needing to carry out the list of electric quantity balancing
Body battery carries out electric quantity balancing.
Carry out the charge/discharge current during electric quantity balancing and be higher than predetermined current, such as, be higher than when the charge/discharge current of set of cells
During 6C.
After set of cells receives shutoff instruction, electric quantity balancing terminates, and otherwise set of cells can also return to original state continuation choosing
Select the cell needing electric quantity balancing.
The cell balance control method of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines.
Fig. 3 is the flow chart of the cell balance control method of set of cells in accordance with another embodiment of the present invention, such as Fig. 3
Shown in, the flow chart of the cell balance control method of set of cells in accordance with another embodiment of the present invention, the method includes
Following steps:
Step S301: start cell balance control method, gathers the terminal voltage of multiple cells in set of cells.At this
In one embodiment of invention, as a example by the nominal voltage lithium battery as 3.7V, describe the set of cells of the embodiment of the present invention in detail
Cell balance control method.
Step S302: judge whether cell is in normal condition, when the terminal voltage having cell too high or too low time,
Then it is in abnormal state of affairs, performs step S304, otherwise perform step S303.
Step S303: do not carry out cell balance control method.
Step S304: obtain the average terminal voltage of set of cells according to the terminal voltage of multiple cells, presets from multiple continuous print
Voltage range obtains the first balance unlatching threshold value that the predeterminated voltage interval at average terminal voltage place is corresponding, wherein, Duo Gelian
The balance that the predeterminated voltage interval of the both sides that continuous predeterminated voltage is interval is corresponding opens threshold value more than multiple continuous print predeterminated voltage districts
Between balance corresponding to the predeterminated voltage interval of centre open threshold value, when the average terminal voltage of set of cells is in different phase respectively
Time, open threshold value by balance shown in table 1 and decide whether to carry out electric quantity balancing.When the average terminal voltage of set of cells is in respectively
During different phase, open threshold value by balance shown in table 1 and decide whether to carry out electric quantity balancing.
Step S305: obtain the first list of the terminal voltage maximum absolute value with the difference of average terminal voltage from multiple cells
Body battery.
Step S306: the absolute value of the most maximum difference and the first balance open threshold value.If the absolute value of the difference of maximum
Open threshold value more than the first balance, then judge to need the first cell is carried out electric quantity balancing, perform step S307, otherwise
Judge not exist the cell needing to carry out electric quantity balancing, perform step S308.
Step S307: open threshold value to needing the cell carrying out electric quantity balancing to carry out electric quantity balancing according to the first balance.
Concrete, after the lithium battery group that nominal voltage is 3.7V is started working, first gather the terminal voltage of each cell also
Calculating the average terminal voltage of set of cells, the average terminal voltage as calculated is 3.1V, now by tabling look-up knowable to 1, averagely holds
Voltage is that to open threshold value be 0.2V for the first balance of the set of cells of 3.1V, now calculates the terminal voltage of each cell and average electricity
The absolute value of the difference of pressure 3.1V, the absolute value if there is a certain cell with the difference of average terminal voltage is more than 0.2V,
Then needing cell is carried out electric quantity balancing, the absolute value if there is the difference of the terminal voltage of multiple cells is all higher than
0.2V, then that cell of the maximum absolute value choosing difference carries out electric quantity balancing, if there is no the absolute value of difference
Cell more than 0.2V does not the most carry out electric quantity balancing.
Here it should be noted that from table 1 it follows that balance corresponding to each predeterminated voltage interval open threshold value from
Multiple continuous print predeterminated voltage intervals are positioned at balance corresponding to the second middle predeterminated voltage interval and open threshold value to being positioned at second
The balance unlatching threshold value that the predeterminated voltage interval of both sides, predeterminated voltage interval is corresponding becomes larger.
Step S308: stop needing the cell carrying out electric quantity balancing to carry out electric quantity balancing.When set of cells receives shutoff
After instruction, electric quantity balancing terminates, and otherwise set of cells returns to the cell that original state continues to select to need electric quantity balancing.
During according to the first balance unlatching threshold value to needing the cell carrying out electric quantity balancing to carry out electric quantity balancing, when
Stop needs being carried out the cell of electric quantity balancing when meeting following condition and carry out electric quantity balancing:
The terminal voltage of multiple cells exists terminal voltage electric less than the end of Second Threshold more than first threshold or terminal voltage
Pressure, first threshold is more than Second Threshold, such as when the terminal voltage of some cell is more than 4.2V or is less than 2.8V,
Stop needing the cell carrying out electric quantity balancing to carry out electric quantity balancing.
The temperature of set of cells is higher than the first preset temperature or less than the second preset temperature, the first preset temperature is preset more than second
Temperature, such as, when the operating temperature of set of cells is higher than 50 DEG C or is less than 0 DEG C, stop needing to carry out the list of electric quantity balancing
Body battery carries out electric quantity balancing.
Carry out the charge/discharge current during electric quantity balancing and be higher than predetermined current, such as, be higher than when the charge/discharge current of set of cells
During 6C.
The cell balance control method of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines, during electric quantity balancing
The first cell choosing the terminal voltage of the cell maximum absolute value with the difference of average terminal voltage is balanced so that
The process of electric quantity balancing is more targeted, can stop the monomer needing to carry out electric quantity balancing during electric quantity balancing
Battery carries out electric quantity balancing, it is ensured that the safety of the process of electric quantity balancing.
Fig. 4 is the structure chart of the cell balance control system of the set of cells according to one embodiment of the invention, such as Fig. 4 institute
Showing, set of cells includes multiple cells of series connection, and system includes: acquisition module 100, computing module 200, acquisition module
300, judge module 400 and balance module 500.
Acquisition module 100 is for gathering the terminal voltage of multiple cells in set of cells.Computing module 200 is for according to multiple
The terminal voltage of cell obtains the average terminal voltage of set of cells.Acquisition module 300 is for from multiple continuous print predeterminated voltage districts
Obtaining the first balance unlatching threshold value that the predeterminated voltage interval at average terminal voltage place is corresponding between, wherein, multiple continuous print are pre-
If corresponding the balancing in the predeterminated voltage interval of the both sides of voltage range opens threshold value more than in multiple continuous print predeterminated voltages interval
Between balance corresponding to predeterminated voltage interval open threshold value.Judge module 400 for the terminal voltage according to multiple cells and
The average terminal voltage of set of cells judges whether the cell needing to carry out electric quantity balancing.Balance module 500 is for sentencing
Disconnected module 400 judges when existence needs the cell carrying out electric quantity balancing, opens threshold value according to the first balance and carries out needs
The cell of electric quantity balancing carries out electric quantity balancing.
The cell balance control system of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines.
In some embodiments of the invention, it is judged that module 400 is additionally operable to from multiple cells obtain terminal voltage with average
First cell of the maximum absolute value of the difference of terminal voltage, and compare absolute value and the first balance unlatching threshold value of difference,
And when the absolute value of difference opens threshold value more than the first balance, it is determined that need the first cell is carried out electric quantity balancing,
Otherwise judge to there is not the cell needing to carry out electric quantity balancing.
In one embodiment of the invention, as a example by the nominal voltage lithium battery as 3.7V, describe the embodiment of the present invention in detail
The cell balance control system of set of cells.First acquisition module 100 gathers the terminal voltage of each cell, calculates mould
Block 200 calculates the average terminal voltage of set of cells, and the average terminal voltage as calculated is 3.1V, and acquisition module 300 is by tabling look-up
1 understand, average terminal voltage be the set of cells of 3.1V first balance open threshold value be 0.2V, it is judged that module 400 now calculates
The absolute value of the difference of the terminal voltage of each cell and average voltage 3.1V, if there is a certain cell with averagely hold electricity
The absolute value of the difference of pressure is more than 0.2V, then balance module 500 needs cell to be carried out electric quantity balancing, if there is many
The absolute value of the difference of the terminal voltage of individual cell is all higher than 0.2V, then balance module 500 chooses the maximum absolute value of difference
That cell carry out electric quantity balancing, if there is no the absolute value of difference more than the cell then balance module of 0.2V
500 do not carry out electric quantity balancing.
Here it should be noted that as shown in table 1, balance corresponding to each predeterminated voltage interval opens threshold value from multiple companies
Continuous predeterminated voltage interval is positioned at balance corresponding to the second middle predeterminated voltage interval and opens threshold value to being positioned at the second default electricity
The balance that between nip, the predeterminated voltage interval of both sides is corresponding is opened threshold value and is become larger.
In some embodiments of the invention, balance module 500 is additionally operable to carrying out needs according to the first balance unlatching threshold value
During the cell of electric quantity balancing carries out electric quantity balancing, stop needs being carried out electricity when judging to meet following condition
The cell of balance carries out electric quantity balancing:
The terminal voltage of multiple cells exists terminal voltage electric less than the end of Second Threshold more than first threshold or terminal voltage
Pressure, first threshold is more than Second Threshold, such as when the terminal voltage of some cell is more than 4.2V or is less than 2.8V,
Stop needing the cell carrying out electric quantity balancing to carry out electric quantity balancing.
The temperature of set of cells is higher than the first preset temperature or less than the second preset temperature, the first preset temperature is preset more than second
Temperature, such as, when the operating temperature of set of cells is higher than 50 DEG C or is less than 0 DEG C, stop needing to carry out the list of electric quantity balancing
Body battery carries out electric quantity balancing.
Carry out the charge/discharge current during electric quantity balancing and be higher than the first predetermined current, such as when the charge/discharge current of set of cells
During higher than 6C.
The cell balance control system of the set of cells according to the present invention, chooses cell terminal voltage as electric quantity balancing
Foundation, judges whether the cell needing to carry out electric quantity balancing, for different by terminal voltage and average terminal voltage
Set of cells average terminal voltage is selected the balance of different electric quantity balancings and is opened threshold value, effectively avoids owing to cell is charged
The interference that the non-linear relation of state and terminal voltage is brought, makes correct electric quantity balancing and determines, by the embodiment of the present invention
Judge module can obtain the first monomer of terminal voltage and the maximum absolute value of the difference of average terminal voltage from multiple cells
Battery, and judge whether to need to carry out electric quantity balancing, can stop needs being carried out by the balance module of the embodiment of the present invention
The cell of electric quantity balancing carries out electric quantity balancing, it is ensured that the safety of the process of electric quantity balancing.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not necessarily
Refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: without departing from
These embodiments can be carried out multiple change in the case of the principle of the present invention and objective, revise, replace and modification, this
Bright scope is limited by claim and equivalent thereof.
Claims (8)
1. the cell balance control method of a set of cells, it is characterised in that described set of cells includes multiple lists of series connection
Body battery, said method comprising the steps of:
Gather the terminal voltage of multiple cells in described set of cells；
Terminal voltage according to multiple described cells obtains the average terminal voltage of described set of cells；
Corresponding first flat in the predeterminated voltage interval at described average terminal voltage place is obtained from multiple continuous print predeterminated voltage intervals
Threshold value opened by weighing apparatus, and wherein, the balance that the predeterminated voltage interval of the both sides that the plurality of continuous print predeterminated voltage is interval is corresponding is opened
The balance that the predeterminated voltage interval of the centre that threshold value is interval more than the plurality of continuous print predeterminated voltage is corresponding opens threshold value；
Terminal voltage and the average terminal voltage of described set of cells according to the plurality of cell judge whether that needs carry out electricity
The cell of amount balance；And
The cell carrying out electric quantity balancing is needed to carry out electricity if it is present open threshold value according to described first balance to described
Amount balance.
Method the most according to claim 1, it is characterised in that wherein, balance corresponding to each predeterminated voltage interval is opened
Open threshold value from the plurality of continuous print predeterminated voltage interval, be positioned at the balance unlatching threshold that the second middle predeterminated voltage interval is corresponding
The value balance corresponding to the predeterminated voltage interval being positioned at described second both sides, predeterminated voltage interval is opened threshold value and is become larger.
Method the most according to claim 1, it is characterised in that the described terminal voltage according to the plurality of cell and
The average terminal voltage of described set of cells judges whether the cell needing to carry out electric quantity balancing, specifically includes:
The first monomer of terminal voltage and the maximum absolute value of the difference of described average terminal voltage is obtained from the plurality of cell
Battery；
The relatively absolute value of the difference of described maximum opens threshold value with described first balance；
If the absolute value of the difference of described maximum opens threshold value more than described first balance, then judge that needs are single to described first
Body battery carries out electric quantity balancing, otherwise judges to there is not the cell needing to carry out electric quantity balancing.
Method the most according to claim 1, it is characterised in that opening threshold value to described need according to described first balance
During the cell of electric quantity balancing to be carried out carries out electric quantity balancing, also include stopping described when meeting following condition
The cell carrying out electric quantity balancing is needed to carry out electric quantity balancing:
The terminal voltage of the plurality of cell exists terminal voltage and is less than the end of Second Threshold more than first threshold or terminal voltage
Voltage, described first threshold is more than described Second Threshold；
Or, the temperature of described set of cells is higher than the first preset temperature or less than the second preset temperature, and described first presets temperature
Degree is more than described second preset temperature；
Or carry out the charge/discharge current during electric quantity balancing described in, higher than predetermined current.
5. the cell balance control system of a set of cells, it is characterised in that described set of cells includes multiple lists of series connection
Body battery, described system includes:
Acquisition module, for gathering the terminal voltage of multiple cells in described set of cells；
Computing module, for obtaining the average terminal voltage of described set of cells according to the terminal voltage of multiple described cells；
Acquisition module, for obtaining the predeterminated voltage district at described average terminal voltage place from multiple continuous print predeterminated voltage intervals
Between the first corresponding balance open threshold value, wherein, the predeterminated voltage of the both sides that the plurality of continuous print predeterminated voltage is interval is interval
Corresponding balance opens the balance that threshold value is corresponding more than the predeterminated voltage interval of the centre in the plurality of continuous print predeterminated voltage interval
Open threshold value；
Judge module, for judging whether according to the terminal voltage of the plurality of cell and the average terminal voltage of described set of cells
Exist and need the cell carrying out electric quantity balancing；And
Balance module, for when described judge module judges that existence needs the cell carrying out electric quantity balancing, according to described
First balance opens threshold value needs the cell carrying out electric quantity balancing to carry out electric quantity balancing to described.
System the most according to claim 5, it is characterised in that wherein, balance corresponding to each predeterminated voltage interval is opened
Open threshold value from the plurality of continuous print predeterminated voltage interval, be positioned at the balance unlatching threshold that the second middle predeterminated voltage interval is corresponding
The value balance corresponding to the predeterminated voltage interval being positioned at described second both sides, predeterminated voltage interval is opened threshold value and is become larger.
System the most according to claim 5, it is characterised in that described judge module is for from the plurality of cell
First cell of the maximum absolute value of the difference of middle acquisition terminal voltage and described average terminal voltage, and compare described difference
Absolute value and described first balance open threshold value, and when the absolute value of described difference opens threshold value more than described first balance,
Judge to need described first cell is carried out electric quantity balancing, otherwise judge to there is not the monomer electricity needing to carry out electric quantity balancing
Pond.
System the most according to claim 5, it is characterised in that described balance module is additionally operable to according to described first flat
During weighing apparatus unlatching threshold value carries out electric quantity balancing to the described cell needing to carry out electric quantity balancing, when judging below satisfied
Stop the described cell needing to carry out electric quantity balancing carried out electric quantity balancing during condition:
The terminal voltage of the plurality of cell exists terminal voltage and is less than the end of Second Threshold more than first threshold or terminal voltage
Voltage, described first threshold is more than described Second Threshold；
Or, the temperature of described set of cells is higher than the first preset temperature or less than the second preset temperature, and described first presets temperature
Degree is more than described second preset temperature；
Or carry out the charge/discharge current during electric quantity balancing described in, higher than the first predetermined current.
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| CN201310526210.XA CN104600760B (en) | 2013-10-30 | 2013-10-30 | The cell balance control method of set of cells and system |
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| CN201310526210.XA CN104600760B (en) | 2013-10-30 | 2013-10-30 | The cell balance control method of set of cells and system |
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