CN106340920B - Control method, device, battery system and the vehicle of the passive equilibrium of battery pack - Google Patents
Control method, device, battery system and the vehicle of the passive equilibrium of battery pack Download PDFInfo
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- CN106340920B CN106340920B CN201610833281.8A CN201610833281A CN106340920B CN 106340920 B CN106340920 B CN 106340920B CN 201610833281 A CN201610833281 A CN 201610833281A CN 106340920 B CN106340920 B CN 106340920B
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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Abstract
The present invention proposes control method, device, battery system and the vehicle of a kind of passive equilibrium of battery pack, wherein the control method of the passive equilibrium of the battery pack, comprising: obtain the temperature data of the battery pack each battery cell in history use；At least one battery cell that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell；During carrying out charge or discharge to the battery pack, the passive equalizer switch of at least one battery cell is opened in advance.The embodiment of the present invention, during charge or discharge can to need balanced battery cell to carry out balanced to fixed in advance, so as to effectively shorten time for balance, and can be avoided and the charging complete of percentage of batteries monomer occur, but balanced the problem of not yet completing, promote portfolio effect.
Description
Technical field
The present invention relates to electronic technology field, in particular to the control method of the passive equilibrium of a kind of battery pack, device, electricity
Cell system and vehicle.
Background technique
Due to the influence of the factors such as cell making process and battery cell working environment difference, battery in battery pack monomer is deposited
In the inconsistent problem of voltage.The inconsistent service efficiency for directly affecting battery pack of voltage between monomer, reduces the longevity of battery pack
Life.Therefore, it is necessary to design special equalizing circuit, battery pack is carried out balanced.
Currently, most of battery management systems carry out equilibrium to battery pack using passive equilibrium, that is, pass through battery both ends
Power resistor consumes battery excess energy and realizes equilibrium.In general, can by monomer SOC between battery (Stage of Charge,
State-of-charge, i.e. remaining capacity) or monomer pressure difference determine to open and close passive equilibrium.
However, often monomer capacity volume variance is obvious between battery, in current technology when equalization operation is opened
Need the long period that could obtain certain portfolio effect under level, or even there are the feelings that charging complete is still not up to portfolio effect
Condition.Therefore, the problems such as there are time for balance length, low efficiency in current passive equilibrium.
Summary of the invention
The present invention is directed to solve above-mentioned technical problem at least to a certain extent.
For this purpose, the first purpose of this invention is to propose a kind of control method of the passive equilibrium of battery pack, Neng Gouyou
Effect shortens time for balance, promotes portfolio effect.
Second object of the present invention is to propose a kind of control device of the passive equilibrium of battery pack.
Third object of the present invention is to propose a kind of battery system.
Fourth object of the present invention is to propose a kind of vehicle.
In order to achieve the above object, embodiment proposes a kind of control of the passive equilibrium of battery pack according to a first aspect of the present invention
Method, comprising the following steps:
Obtain the temperature data of the battery pack each battery cell in history use；
At least one that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell
Battery cell；
During carrying out charge or discharge to the battery pack, the quilt of at least one battery cell is opened in advance
Dynamic equalizer switch.
The control method of the passive equilibrium of battery pack according to an embodiment of the present invention can also have following supplementary technology special
Sign:
In one embodiment of the invention, the temperature data according to each battery cell determines the battery
At least one battery cell of passive equilibrium is needed in group, comprising:
The battery cell of preset ratio is selected in the battery pack according to the temperature data of each battery cell, is made
Passive at least one balanced battery cell is needed to be described, wherein the temperature data of the battery cell of the preset ratio is small
The temperature data of other battery cells in the battery pack.
In one embodiment of the invention, the temperature data according to each battery cell determines the battery
At least one battery cell of passive equilibrium is needed in group, comprising:
Determine the maximum value in the temperature data of each battery cell；
Obtain the temperature data of each battery cell and the difference of the maximum value；
At least one battery cell for determining that the difference is greater than preset threshold is at least the one of the passive equilibrium of the needs
A battery cell.
In one embodiment of the invention, further includes: according to the temperature data of each battery cell to the electricity
Pond group carries out the temperature difference specific analysis of battery cell, to judge whether the temperature difference of battery cell of the battery pack shows
It writes；
Wherein, when judging that the temperature difference of battery cell of the battery pack is significant, according to each battery cell
Temperature data determine at least one battery cell that passive equilibrium is needed in the battery pack.
In one embodiment of the invention, the temperature data according to each battery cell is to the battery pack
The temperature difference specific analysis of battery cell is carried out, to judge whether the temperature difference of battery cell of the battery pack is significant, packet
It includes:
Determine the mean temperature of the temperature data of each battery cell；
The temperature data of each battery cell and the difference of the mean temperature are determined respectively；
The temperature difference specific analysis of battery cell is carried out, according to the difference to judge the battery cell of the battery pack
Whether temperature difference is significant.
In one embodiment of the invention, described during carrying out charge or discharge to the battery pack, in advance
Open the passive equalizer switch of at least one battery cell, comprising:
When starting to carry out charge or discharge to the battery pack, the passive equilibrium of at least one battery cell is opened
Switch；Alternatively,
Charge or discharge are being carried out after preset time to the battery pack, are opening at least one battery cell
Passive equalizer switch.
In one embodiment of the invention, the passive equalizer switch of at least one battery cell described in the unlatching it
Afterwards, further includes:
Detect the voltage difference in the battery pack between each battery cell；
The passive equalizer switch of each battery cell in the battery pack is controlled according to the voltage difference.
Second aspect of the present invention embodiment proposes a kind of control device of the passive equilibrium of battery pack, comprising:
Module is obtained, for obtaining the temperature data of the battery pack each battery cell in history use；
Determining module needs passively for being determined according to the temperature data of each battery cell in the battery pack
At least one battery cell of weighing apparatus；
Control module, for opening described at least one in advance during carrying out charge or discharge to the battery pack
The passive equalizer switch of a battery cell.
The control device of the passive equilibrium of battery pack according to an embodiment of the present invention can also have following supplementary technology special
Sign:
In one embodiment of the invention, the determining module includes:
Selecting unit, for selecting preset ratio in the battery pack according to the temperature data of each battery cell
Battery cell, need at least one passive balanced battery cell as described, wherein the battery cell of the preset ratio
Temperature data be less than the battery pack in other battery cells temperature data.
In one embodiment of the invention, the determining module includes:
First determination unit, the maximum value in temperature data for determining each battery cell；
Acquiring unit, for obtaining the temperature data of each battery cell and the difference of the maximum value；
Second determination unit, at least one battery cell for determining that the difference is greater than preset threshold is the needs
Passive at least one balanced battery cell.
In one embodiment of the invention, further includes:
Analysis module, for carrying out the temperature of battery cell to the battery pack according to each battery cell temperature data
Difference analysis is spent, to judge whether the temperature difference of battery cell of the battery pack is significant；
Wherein, the determining module is used to judge the temperature difference of the battery cell of the battery pack in the analysis module
When significant, at least one electricity that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell
Pond monomer.
In one embodiment of the invention, the analysis module, is used for:
Determine the mean temperature of the temperature data of each battery cell；
The temperature data of each battery cell and the difference of the mean temperature are determined respectively；
The temperature difference specific analysis of battery cell is carried out, according to the difference to judge the battery cell of the battery pack
Whether temperature difference is significant.
In one embodiment of the invention, the control module is used for:
When starting to carry out charge or discharge to the battery pack, the passive equilibrium of at least one battery cell is opened
Switch；Alternatively,
Charge or discharge are being carried out after preset time to the battery pack, are opening at least one battery cell
Passive equalizer switch.
In one embodiment of the invention, further includes:
Detection module detects institute after the passive equalizer switch of at least one battery cell described in the unlatching
State the voltage difference in battery pack between each battery cell；
The control module be also used to be controlled according to the voltage difference each battery cell in the battery pack it is passive
Weighing apparatus switch.
Fourth aspect present invention embodiment proposes a kind of battery system, comprising: battery pack；Passive balanced component, it is described
Passive balanced component includes resistor assembly and passive equalizer switch component；And the battery of third aspect present invention any embodiment
The control device of the passive equilibrium of group.
Fourth aspect present invention embodiment proposes a kind of vehicle, the battery including third aspect present invention any embodiment
System.
Control method, device, battery system and the vehicle of the passive equilibrium of the battery pack of the embodiment of the present invention, can be according to electricity
Temperature data in the group of pond in the history use of each battery cell determines the battery cell that passive equilibrium is needed in battery pack, and
The passive equalizer switch of the battery cell of preset condition will be met by opening in advance during charge or discharge, as a result, relatively
Balanced, mistake of the embodiment of the present invention in charge or discharge is just carried out when electricity difference is obvious between battery cell in the related technology
To need balanced battery cell to carry out balanced to fixed in advance by Cheng Zhongke, so as to effectively shorten time for balance, and energy
The charging complete of percentage of batteries monomer, but balanced the problem of not yet completing enough are avoided the occurrence of, portfolio effect is promoted.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart according to the control method of the passive equilibrium of the battery pack of one embodiment of the invention；
Fig. 2 is the flow chart according to the control method of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 3 is the flow chart according to the control method of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 4 is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of one embodiment of the invention；
Fig. 5 a is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 5 b is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 6 a is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 6 b is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 7 is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention；
Fig. 8 is the structural schematic diagram according to the battery system of one embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " multiple " refers to two or more；Term " first ",
" second " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Below with reference to the accompanying drawings control method, device and the vehicle of the passive equilibrium of battery pack according to an embodiment of the present invention are described
?.
It should be noted that the vehicle of the embodiment of the present invention can be electric car or hybrid vehicle etc..
Fig. 1 is the flow chart according to the control method of the passive equilibrium of the battery pack of one embodiment of the invention.
As shown in Figure 1, the control method of the passive equilibrium of battery pack according to an embodiment of the present invention, including step S101-
S104。
S101 obtains the temperature data of the battery pack each battery cell in history use.
In one embodiment of the invention, in the use process of battery pack, battery can be detected by temperature sensor
The temperature data of each battery cell in group, and recorded.
Specifically, each battery cell can be recorded respectively in the temperature data of a certain preset time point, or according to pre-
If the period records the temperature data of each battery cell respectively, to obtain each battery cell in the temperature number at multiple time points
According to.Wherein, at every point of time to the synchronous detection temperature data of each battery cell.
For example, the temperature data of each battery cell can be detected at 30 after charge or discharge start minute,
And it is recorded；Or the temperature data of primary each battery cell can be detected every 10 minutes, and recorded.
S102 is determined according to the temperature data of each battery cell and is needed passive equilibrium in the battery pack at least
One battery cell.
Since the temperature of battery cell rises the thermal energy mainly due to the generation of the internal resistance of battery cell, it can lead to
The temperature relation for crossing battery cell is inferred to internal resistance size relation between battery cell, and in general, temperature value is bigger, internal resistance
It is bigger.Therefore, the internal resistance of the corresponding battery cell of the maximum value of temperature data is maximum.It differs greatly with temperature data maximum value
The internal resistance of battery cell is relatively small, needs to carry out equilibrium.
In an embodiment of the present invention, it can be determined through but not limited to following manner and need passive at least one balanced electricity
Pond monomer:
Mode one
The battery cell of preset ratio is selected in the battery pack according to the temperature data of each battery cell, is made
Passive at least one balanced battery cell is needed to be described, wherein the temperature data of the battery cell of the preset ratio is small
The temperature data of other battery cells in the battery pack.
That is, can according to the size of the temperature data of each battery cell, selected from battery pack temperature data compared with
The battery cell of small preset ratio is as at least one battery cell for needing passive equilibrium.
Wherein, preset ratio can be determined according to historical experience or test data.
For example, battery pack includes 10 battery cells in total, and preset ratio 30% then can be the smallest by 3 by temperature
A battery cell is as at least one battery cell for needing passive equilibrium.
Mode two
As shown in Fig. 2, can be by comparing the temperature data between each battery cell and the battery cell of maximum temperature
Difference, and using the apparent battery cell of difference as battery cell to be equalized is needed, specifically it can comprise the following steps that
S201 determines the maximum value in the temperature data of each battery cell.
S202 obtains the temperature data of each battery cell and the difference of the maximum value.
S203 determines that the difference is greater than at least one battery cell of preset threshold and needs passive equilibrium extremely to be described
A few battery cell.
The apparent monomer of battery cell difference that can determine that as a result, and have maximum internal resistance, the i.e. internal resistance of cell are lesser
Battery cell, so that the passive equalizer switch of these battery cells is opened in advance, by this in subsequent charge or discharge process
The balanced single group access of a little battery cells, carries out passive equilibrium, in advance so as to avoid the capacity volume variance between battery cell bright
Just start when aobvious balanced and bring time for balance is too long, is even unable to complete balanced problem.
Further, in order to improve the determining accuracy for needing passive at least one balanced battery cell, in this hair
In bright one embodiment, before the accuracy for determining passive at least one balanced battery cell, it may further comprise the step of: root
The temperature difference specific analysis for carrying out battery cell to the battery pack according to each battery cell temperature data, described in judgement
Whether the temperature difference of the battery cell of battery pack is significant, and significant in the temperature difference for the battery cell for judging the battery pack
When, at least one battery list that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell
Body.
Wherein, difference analysis is to judge whether the otherness in one group of data between each data is significantly analyzed.This
In some embodiments of inventive embodiments, the temperature difference of battery cell can be judged by statistics such as variance, standard deviation, the coefficient of variation
It is different whether significant.
It in one embodiment of the invention, can also be directly according to the difference between the maximum value of temperature data and minimum value
Judge whether the temperature difference of the battery cell of battery pack is significant.Wherein, when between the maximum value of temperature data and minimum value
When difference is greater than preset difference value, it may be determined that the temperature difference of the battery cell of battery pack is significant.
The battery pack is carried out according to the temperature data of each battery cell in one embodiment of the invention
The temperature difference specific analysis of battery cell, to judge whether the temperature difference of battery cell of the battery pack significantly can specifically wrap
It includes: determining the mean temperature of the temperature data of each battery cell；The temperature number of each battery cell is determined respectively
According to the difference with the mean temperature；The temperature difference specific analysis of battery cell is carried out, according to the difference to judge the electricity
Whether the temperature difference of the battery cell of pond group is significant.
Wherein, it may include but be not limited to be calculated according to the difference according to the temperature difference specific analysis that difference carries out battery cell
The modes such as variance, standard deviation or the coefficient of variation carry out the temperature difference specific analysis of battery cell.
For example, the variance of the temperature data of each battery cell can be calculated according to difference, if the variance is greater than in advance
If value, then can determine that the temperature difference of the battery cell of battery pack is significant, need to carry out battery cell corresponding in battery pack
It is balanced.If the variance is not more than preset threshold, it can determine that the temperature difference of the battery cell of battery pack is not significant, i.e. battery
The internal resistance difference of each battery cell is little in group, then balanced without opening in advance.
It should be noted that the preset time point can be used directly for the temperature data for preset time point record
Corresponding temperature data carries out the temperature difference specific analysis of battery cell.The corresponding temperature data recorded according to predetermined period, can
The temperature data record at a time point is selected to be analyzed from the record corresponding with multiple time points of record as needed；
Or analyzed respectively according to the corresponding record of each time point, then converged according to the analysis result of various time points
Always, to determine whether the temperature difference of the battery cell of battery pack is significant.
S103 opens at least one described battery list during carrying out charge or discharge to the battery pack in advance
The passive equalizer switch of body.
It in one embodiment of the invention, can be when starting to carry out charge or discharge to the battery pack, described in unlatching
The passive equalizer switch of at least one battery cell.Alternatively, can be when carrying out charge or discharge by presetting to the battery pack
Between after, open the passive equalizer switch of at least one battery cell.Wherein, preset time can rule of thumb or test number
According to being set.
The control method of the passive equilibrium of battery pack according to an embodiment of the present invention, can be according to battery list each in battery pack
Temperature data in the history use of body determines the battery cell that passive equilibrium is needed in battery pack, and in the mistake of charge or discharge
The passive equalizer switch of the battery cell of preset condition will be met by opening in advance in journey, as a result, relative in the related technology in electricity
Just carry out balanced when electricity difference is obvious between the monomer of pond, the embodiment of the present invention can be in advance to really during charge or discharge
The balanced battery cell of fixed needs carries out balanced, so as to effectively shorten time for balance, and can be avoided appearance part electricity
The charging complete of pond monomer, but balanced the problem of not yet completing, promote portfolio effect.
Fig. 3 is the flow chart according to the control method of the passive equilibrium of the battery pack of another embodiment of the present invention.
As shown in figure 3, the control method of the passive equilibrium of battery pack according to an embodiment of the present invention, including step S301-
S305。
Wherein, step S301-S303 is identical as step S101-S103 in embodiment illustrated in fig. 1, can refer to real shown in Fig. 1
Apply example.
S304 detects the voltage difference in the battery pack between each battery cell.
S305 controls the passive equalizer switch of each battery cell in the battery pack according to the voltage difference.
After opening the passive equalizer switch for needing balanced battery cell, balanced battery cell is needed to pass through its string
The resistance of connection starts equalizing voltage.It is balanced excessive in order to avoid the consumption electricity that concatenated resistance is excessive, it can be in balancing procedure
In, the voltage difference in the battery pack between each battery cell is detected, and control in the battery pack according to the voltage difference
The passive equalizer switch of each battery cell.To when the voltage for the battery cell for opening passive equalizer switch is higher than other electricity
When the voltage certain value of pond monomer, its equalizer switch is closed, to avoid balanced excessive.
Corresponding with the control method embodiment of passive equilibrium of above-mentioned battery pack, the present invention also proposes a kind of battery pack
Passive balanced control device.
Fig. 4 is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of one embodiment of the invention.
As shown in figure 4, the control device of the passive equilibrium of battery pack according to an embodiment of the present invention, comprising: obtain module
10, determining module 20 and control module 30.
Specifically, the temperature number that module 10 is used to obtain the battery pack each battery cell in history use is obtained
According to.
In one embodiment of the invention, in the use process of battery pack, battery can be detected by temperature sensor
The temperature data of each battery cell in group, and recorded.
Specifically, each battery cell can be recorded respectively in the temperature data of a certain preset time point, or according to pre-
If the period records the temperature data of each battery cell respectively, to obtain each battery cell in the temperature number at multiple time points
According to.Wherein, at every point of time to the synchronous detection temperature data of each battery cell.
For example, the temperature data of each battery cell can be detected at 30 after charge or discharge start minute,
And it is recorded；Or the temperature data of primary each battery cell can be detected every 10 minutes, and recorded.
Determining module 20 needs passively for being determined according to the temperature data of each battery cell in the battery pack
At least one balanced battery cell.
Since the temperature of battery cell rises the thermal energy mainly due to the generation of the internal resistance of battery cell, it can lead to
The temperature relation for crossing battery cell is inferred to internal resistance size relation between battery cell, and in general, temperature value is bigger, internal resistance
It is bigger.Therefore, the internal resistance of the corresponding battery cell of the maximum value of temperature data is maximum.It differs greatly with temperature data maximum value
The internal resistance of battery cell is relatively small, needs to carry out equilibrium.
In an embodiment of the present invention, determining module 20 can be determined through but not limited to following manner needs passive equilibrium
At least one battery cell:
Mode one
As shown in Figure 5 a, determining module 20 may include selecting unit 21.
Selecting unit 21 is used to select default ratio in the battery pack according to the temperature data of each battery cell
The battery cell of example needs passive at least one balanced battery cell as described, wherein the battery list of the preset ratio
The temperature data of body is less than the temperature data of other battery cells in the battery pack.
That is, selecting unit 21 can be selected from battery pack according to the size of the temperature data of each battery cell
The battery cell of the lesser preset ratio of temperature data is as at least one battery cell for needing passive equilibrium.
Wherein, preset ratio can be determined according to historical experience or test data.
For example, battery pack includes 10 battery cells in total, and preset ratio 30% then can be the smallest by 3 by temperature
A battery cell is as at least one battery cell for needing passive equilibrium.
Mode two
As shown in Figure 5 b, determining module 20 can be by comparing between each battery cell and the battery cell of maximum temperature
The difference of temperature data, and the battery cell that the apparent battery cell of difference is to be equalized as need.Specifically, determining mould
Block 20 can include: the first determination unit 22, acquiring unit 23 and the second determination unit 24.
Wherein, the first determination unit 22 is used to determine the maximum value in the temperature data of each battery cell.
Acquiring unit 23 is used to obtain the temperature data of each battery cell and the difference of the maximum value.
At least one battery cell that second determination unit 24 is used to determine that the difference to be greater than preset threshold is the need
It will passive at least one balanced battery cell.
The apparent monomer of battery cell difference that can determine that as a result, and have maximum internal resistance, the i.e. internal resistance of cell are lesser
Battery cell, so that the passive equalizer switch of these battery cells is opened in advance, by this in subsequent charge or discharge process
The balanced single group access of a little battery cells, carries out passive equilibrium, in advance so as to avoid the capacity volume variance between battery cell bright
Just start when aobvious balanced and bring time for balance is too long, is even unable to complete balanced problem.
Control module 30 is used to open described at least one in advance during carrying out charge or discharge to the battery pack
The passive equalizer switch of a battery cell.
In one embodiment of the invention, control module 30 can be used for: start to carry out the battery pack charging or
When electric discharge, the passive equalizer switch of at least one battery cell is opened.
In one embodiment of the invention, control module 30 can be used for: carry out charge or discharge to the battery pack
After preset time, the passive equalizer switch of at least one battery cell is opened.Wherein, preset time can be rule of thumb
Or test data is set.
Further, in order to improve the determining accuracy for needing passive at least one balanced battery cell, in this hair
In bright one embodiment, the control device of the passive equilibrium of the battery pack, as shown in figure 6 a and 6b, on the basis of Fig. 5 a and 5b
On may also include that analysis module 40.
Analysis module 40 is used to carry out battery cell to the battery pack according to each battery cell temperature data
Temperature difference specific analysis, to judge whether the temperature difference of battery cell of the battery pack is significant.
Wherein, the determining module 20 is used to judge the temperature of the battery cell of the battery pack in the analysis module 40
When significant difference, is determined according to the temperature data of each battery cell and need at least the one of passive equilibrium in the battery pack
A battery cell.
Wherein, difference analysis is to judge whether the otherness in one group of data between each data is significantly analyzed.This
In some embodiments of inventive embodiments, analysis module 40 can judge battery list by statistics such as variance, standard deviation, the coefficient of variation
Whether the temperature difference of body is significant.
In one embodiment of the invention, analysis module 40 can also be directly according to the maximum value of temperature data and minimum value
Between difference judge whether the temperature difference of the battery cell of battery pack significant.Wherein, when the maximum value of temperature data and most
When difference between small value is greater than preset difference value, it may be determined that the temperature difference of the battery cell of battery pack is significant.
In one embodiment of the invention, analysis module 40 can be used for: determine the temperature number of each battery cell
According to mean temperature；The temperature data of each battery cell and the difference of the mean temperature are determined respectively；According to described
Difference carries out the temperature difference specific analysis of battery cell, to judge whether the temperature difference of battery cell of the battery pack shows
It writes.
Wherein, it may include but be not limited to be calculated according to the difference according to the temperature difference specific analysis that difference carries out battery cell
The modes such as variance, standard deviation or the coefficient of variation carry out the temperature difference specific analysis of battery cell.
For example, analysis module 40 can calculate the variance of the temperature data of each battery cell according to difference, if should
Variance is greater than preset value, then can determine that the temperature difference of the battery cell of battery pack is significant, needs to electricity corresponding in battery pack
Pond monomer carries out balanced.If the variance is not more than preset threshold, the temperature difference of the battery cell of battery pack can determine not
Significantly, i.e., the internal resistance difference of each battery cell is little in battery pack, then balanced without opening in advance.
It should be noted that the preset time point can be used directly for the temperature data for preset time point record
Corresponding temperature data carries out the temperature difference specific analysis of battery cell.The corresponding temperature data recorded according to predetermined period, can
The temperature data record at a time point is selected to be analyzed from the record corresponding with multiple time points of record as needed；
Or analyzed respectively according to the corresponding record of each time point, then converged according to the analysis result of various time points
Always, to determine whether the temperature difference of the battery cell of battery pack is significant.
The control device of the passive equilibrium of the battery pack of the embodiment of the present invention, can be according to battery cell each in battery pack
Temperature data in history use determines the battery cell that passive equilibrium is needed in battery pack, and during charge or discharge
The passive equalizer switch of the battery cell of preset condition will be met by opening in advance, as a result, relative in the related technology in battery list
Equilibrium is just carried out when electricity difference is obvious between body, the embodiment of the present invention can be in advance to fixed during charge or discharge
It needs balanced battery cell to carry out balanced, so as to effectively shorten time for balance, and can be avoided and percentage of batteries list occur
Body charging complete, but balanced the problem of not yet completing, promote portfolio effect.
Fig. 7 is the structural schematic diagram according to the control device of the passive equilibrium of the battery pack of another embodiment of the present invention.
As shown in fig. 7, the control device of the passive equilibrium of battery pack according to an embodiment of the present invention, comprising: obtain module
10, determining module 20, control module 30 and detection module 50.
Wherein, it is identical as embodiment illustrated in fig. 4 that module 10, determining module 20 and control module 30 are obtained, can refer to Fig. 4
Illustrated embodiment.
After detection module 50 is for the passive equalizer switch of at least one battery cell described in the unlatching, institute is detected
State the voltage difference in battery pack between each battery cell.
Control module 30 is also used to control the passive equilibrium of each battery cell in the battery pack according to the voltage difference
Switch.
After opening the passive equalizer switch for needing balanced battery cell, balanced battery cell is needed to pass through its string
The resistance of connection starts equalizing voltage.It is balanced excessive in order to avoid the consumption electricity that concatenated resistance is excessive, it can be in balancing procedure
In, the voltage difference in the battery pack between each battery cell is detected, and control in the battery pack according to the voltage difference
The passive equalizer switch of each battery cell.To when the voltage for the battery cell for opening passive equalizer switch is higher than other electricity
When the voltage certain value of pond monomer, its equalizer switch is closed, to avoid balanced excessive.
The present invention also proposes a kind of battery system.
Fig. 8 is the structural schematic diagram according to the battery system of one embodiment of the invention.
As shown in figure 8, battery system according to an embodiment of the present invention, comprising: battery pack 100,200 and of passive balanced component
The control device 300 of the passive equilibrium of battery pack.
Wherein, passive balanced component 200 includes resistor assembly 210 and passive equalizer switch component 220.Wherein, the electricity
It is and described after i-th of resistance connects with i-th of passive equalizer switch in the passive equalizer switch component 220 in resistance component 210
I-th of battery cell series connection in battery pack 100, i are the integer greater than 1 and less than or equal to N, and N, which is in battery pack 100, includes
The quantity of battery cell.
The control device 300 of the passive equilibrium of battery pack can be the passive equilibrium of the battery pack of any embodiment of the present invention
Control device.
Battery system according to an embodiment of the present invention, can be according to the temperature in the history use of battery cell each in battery pack
Degree needs the battery cell of passive equilibrium according to determining in battery pack, and opens and will meet in advance during charge or discharge
The passive equalizer switch of the battery cell of preset condition, as a result, relative to electricity difference is bright between battery cell in the related technology
The battery balanced, the embodiment of the present invention can be balanced to fixed needs in advance during charge or discharge is just carried out when aobvious
Monomer carries out balanced, so as to effectively shorten time for balance, and can be avoided and the charging complete of percentage of batteries monomer occurs, but
Balanced the problem of not yet completing, promote portfolio effect.
The present invention also proposes a kind of vehicle.
Vehicle according to an embodiment of the present invention, the control dress of the passive equilibrium of the battery pack including any embodiment of the present invention
It sets, can be determined according to the temperature data in the history use of battery cell each in battery pack and need passive equilibrium in battery pack
Battery cell, and opened in advance during charge or discharge and open the passive equilibrium for meeting the battery cell of preset condition
It closes, balanced relative to just carrying out when electricity difference is obvious between battery cell in the related technology as a result, the embodiment of the present invention is being filled
Balanced battery cell progress can be needed balanced to fixed in advance during electricity or electric discharge, so as to effectively shorten
It weighs the time, and can be avoided and the charging complete of percentage of batteries monomer occur, but balanced the problem of not yet completing, promote balanced effect
Fruit.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is two or more, unless separately
There is clearly specific restriction.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.The more specific example (non-exhaustive list) of computer-readable medium include the following: there is the electricity of one or more wirings
Interconnecting piece (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..Although having been shown and retouching above
The embodiment of the present invention is stated, it is to be understood that above-described embodiment is exemplary, and should not be understood as to limit of the invention
System, those skilled in the art can be changed above-described embodiment, modify, replace and become within the scope of the invention
Type.
Claims (12)
1. a kind of control method of the passive equilibrium of battery pack, which comprises the following steps:
Obtain the temperature data of the battery pack each battery cell in history use；
At least one battery that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell
Monomer, wherein before at least one battery cell for needing passive equilibrium in determining the battery pack, according to each electricity
The temperature data of pond monomer carries out the temperature difference specific analysis of battery cell to the battery pack, to judge the electricity of the battery pack
Whether the temperature difference of pond monomer is significant；When judging that the temperature difference of battery cell of the battery pack is significant, according to described
The temperature data of each battery cell determines at least one battery cell that passive equilibrium is needed in the battery pack, wherein institute
The temperature difference specific analysis for carrying out battery cell to the battery pack according to the temperature data of each battery cell is stated, to sentence
Whether the temperature difference of the battery cell for the battery pack of breaking is significant, comprising: determines the temperature data of each battery cell
Mean temperature；The temperature data of each battery cell and the difference of the mean temperature are determined respectively；According to the difference
Value carries out the temperature difference specific analysis of battery cell, to judge whether the temperature difference of battery cell of the battery pack is significant；
During carrying out charge or discharge to the battery pack, the passive equal of at least one battery cell is opened in advance
Weighing apparatus switch.
2. the method as described in claim 1, which is characterized in that described to be determined according to the temperature data of each battery cell
At least one battery cell of passive equilibrium is needed in the battery pack, comprising:
The battery cell for selecting preset ratio in the battery pack according to the temperature data of each battery cell, as institute
It states and needs passive at least one balanced battery cell, wherein the temperature data of the battery cell of the preset ratio is less than institute
State the temperature data of other battery cells in battery pack.
3. the method as described in claim 1, which is characterized in that described to be determined according to the temperature data of each battery cell
At least one battery cell of passive equilibrium is needed in the battery pack, comprising:
Determine the maximum value in the temperature data of each battery cell；
Obtain the temperature data of each battery cell and the difference of the maximum value；
At least one battery cell for determining that the difference is greater than preset threshold is described at least one electricity for needing passive equilibrium
Pond monomer.
4. the method as described in claim 1, which is characterized in that described in the process for carrying out charge or discharge to the battery pack
In, the passive equalizer switch of at least one battery cell is opened in advance, comprising:
When starting to carry out charge or discharge to the battery pack, the passive equilibrium for opening at least one battery cell is opened
It closes；Alternatively,
Charge or discharge are being carried out after preset time to the battery pack, are opening the passive of at least one battery cell
Equalizer switch.
5. method according to any of claims 1-4, which is characterized in that at least one battery cell described in the unlatching
Passive equalizer switch after, further includes:
Detect the voltage difference in the battery pack between each battery cell；
The passive equalizer switch of each battery cell in the battery pack is controlled according to the voltage difference.
6. a kind of control device of the passive equilibrium of battery pack characterized by comprising
Module is obtained, for obtaining the temperature data of the battery pack each battery cell in history use；
Determining module needs passive equilibrium for determining according to the temperature data of each battery cell in the battery pack
At least one battery cell；
Analysis module, before at least one battery cell for needing passive equilibrium in determining the battery pack, according to institute
The temperature difference specific analysis that each battery cell temperature data carries out battery cell to the battery pack is stated, to judge the battery
Whether the temperature difference of the battery cell of group is significant；
The analysis module, the mean temperature of the temperature data for determining each battery cell；It determines respectively described each
The difference of the temperature data of a battery cell and the mean temperature；The temperature difference for carrying out battery cell according to the difference is anisotropic
Analysis, to judge whether the temperature difference of battery cell of the battery pack is significant；
When temperature difference of the determining module for judging the battery cell of the battery pack in the analysis module is significant, root
At least one battery cell that passive equilibrium is needed in the battery pack is determined according to the temperature data of each battery cell；
Control module, for during carrying out charge or discharge to the battery pack, opening at least one described electricity in advance
The passive equalizer switch of pond monomer.
7. device as claimed in claim 6, which is characterized in that the determining module includes:
Selecting unit, for selecting the electricity of preset ratio in the battery pack according to the temperature data of each battery cell
Pond monomer needs passive at least one balanced battery cell as described, wherein the temperature of the battery cell of the preset ratio
Degree is according to the temperature data for being less than other battery cells in the battery pack.
8. device as claimed in claim 6, which is characterized in that the determining module includes:
First determination unit, the maximum value in temperature data for determining each battery cell；
Acquiring unit, for obtaining the temperature data of each battery cell and the difference of the maximum value；
Second determination unit, at least one battery cell for determining that the difference is greater than preset threshold is described needs passively
At least one balanced battery cell.
9. device as claimed in claim 6, which is characterized in that the control module is used for:
When starting to carry out charge or discharge to the battery pack, the passive equilibrium for opening at least one battery cell is opened
It closes；Alternatively,
Charge or discharge are being carried out after preset time to the battery pack, are opening the passive of at least one battery cell
Equalizer switch.
10. device as claim in any one of claims 6-9, which is characterized in that further include:
Detection module detects the electricity after the passive equalizer switch of at least one battery cell described in the unlatching
Voltage difference in the group of pond between each battery cell；
The passive equilibrium that the control module is also used to control each battery cell in the battery pack according to the voltage difference is opened
It closes.
11. a kind of battery system characterized by comprising
Battery pack；
Passive balanced component, the passive balanced component include resistor assembly and passive equalizer switch component；And
Such as the control device of the passive equilibrium of the described in any item battery packs of claim 6-10；
Wherein, i-th of resistance is connected with i-th of passive equalizer switch in the passive equalizer switch component in the resistor assembly
Afterwards, it connects with i-th of battery cell in the battery pack, i is the integer greater than 1 and less than or equal to N, and N is to wrap in battery pack
Include the quantity of battery cell.
12. a kind of vehicle characterized by comprising battery system as claimed in claim 11.
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| CN110015180B (en) * | 2017-08-31 | 2022-09-09 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN108068656A (en) * | 2017-12-22 | 2018-05-25 | 苏州精控能源科技有限公司 | Passive balanced automobile batteries managing device |
| CN108879818A (en) * | 2018-06-06 | 2018-11-23 | 安徽锐能科技有限公司 | Passive equalization methods for battery pack |
| CN108832676A (en) * | 2018-06-06 | 2018-11-16 | 安徽锐能科技有限公司 | Passive equal balance system for battery pack |
| CN111009945B (en) * | 2019-12-25 | 2021-11-23 | 孚能科技(赣州)股份有限公司 | Photoelectric conversion-based battery pack equalization circuit and equalization method |
| CN111446760B (en) * | 2020-04-14 | 2024-01-16 | 深圳欣旺达智能科技有限公司 | Battery equalization management method, circuit, device and storage medium |
| CN115863800A (en) * | 2022-12-26 | 2023-03-28 | 江苏纳通能源技术有限公司 | Passive equalization method based on historical data analysis |
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