CN106340920A - Control method and device of passive equalization of battery pack, battery system and vehicle - Google Patents
Control method and device of passive equalization of battery pack, battery system and vehicle Download PDFInfo
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- CN106340920A CN106340920A CN201610833281.8A CN201610833281A CN106340920A CN 106340920 A CN106340920 A CN 106340920A CN 201610833281 A CN201610833281 A CN 201610833281A CN 106340920 A CN106340920 A CN 106340920A
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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Abstract
The invention provides a control method and device of the passive equalization of a battery pack, a battery system and a vehicle. The method comprises a step of obtaining the temperature data of each single battery of the battery pack in historical use, a step of determining at least one single battery with the need of passive equalization in the battery pack according to the temperature data of each single battery, and a step of opening the passive equalization switch of the at least one single battery in the process of charging or discharging the battery pack. In the embodiment of the invention, in the process of charging or discharging, the determined single battery with the need of passive equalization can be equalized in advance, thus the equalization time can be effectively shortened, the problem that the charging of partial single batteries is completed but the equalization is not completed can be avoided, and the equalization effect is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a method and a device for controlling passive equalization of a battery pack, a battery system and a vehicle.
Background
Due to the influence of factors such as the manufacturing process of the battery, the difference of the working environment of the battery monomer and the like, the battery monomer in the battery pack has the problem of inconsistent voltage. The inconsistent voltage between the monomers directly influences the service efficiency of the battery pack and reduces the service life of the battery pack. Therefore, a special equalization circuit needs to be designed to equalize the battery pack.
At present, most battery management systems balance battery packs by adopting passive balance, namely, balance is realized by consuming redundant energy of batteries through power resistors at two ends of the batteries. Typically, the opening and closing of passive equalization is determined by the cell SOC (state of Charge) or the cell differential pressure between the cells.
However, when the equalization operation is started, the difference of the energy of the cells is often obvious, and a certain equalization effect can be obtained only in a long time under the current technical level, even the equalization effect is not achieved after the charging is completed. Therefore, the current passive equalization has the problems of long equalization time, low efficiency and the like.
Disclosure of Invention
The present invention aims to solve the above technical problem at least to some extent.
Therefore, a first objective of the present invention is to provide a method for controlling passive equalization of a battery pack, which can effectively shorten the equalization time and improve the equalization effect.
A second object of the present invention is to provide a control device for passive equalization of a battery pack.
A third object of the present invention is to provide a battery system.
A fourth object of the invention is to propose a vehicle.
To achieve the above object, according to a first aspect of the present invention, a method for controlling passive equalization of a battery pack is provided, including the steps of:
acquiring temperature data of each battery monomer in historical use of the battery pack;
determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell;
and in the process of charging or discharging the battery pack, the passive equalization switch of the at least one battery cell is started in advance.
The control method for the passive equalization of the battery pack according to the embodiment of the invention can also have the following additional technical characteristics:
in an embodiment of the present invention, the determining at least one battery cell in the battery pack, which needs to be passively equalized according to the temperature data of each battery cell, includes:
and selecting a preset proportion of battery monomers in the battery pack according to the temperature data of each battery monomer to serve as the at least one battery monomer needing passive equalization, wherein the temperature data of the preset proportion of battery monomers is smaller than the temperature data of other battery monomers in the battery pack.
In an embodiment of the present invention, the determining at least one battery cell in the battery pack, which needs to be passively equalized according to the temperature data of each battery cell, includes:
determining a maximum value in the temperature data of each battery cell;
acquiring the difference value between the temperature data of each battery monomer and the maximum value;
and determining at least one battery cell of which the difference is greater than a preset threshold value as the at least one battery cell needing passive equalization.
In one embodiment of the present invention, further comprising: performing temperature difference analysis on the battery monomers on the battery pack according to the temperature data of each battery monomer to judge whether the temperature difference of the battery monomers of the battery pack is obvious or not;
when the temperature difference of the battery monomers of the battery pack is judged to be remarkable, at least one battery monomer needing passive equalization in the battery pack is determined according to the temperature data of each battery monomer.
In an embodiment of the present invention, the analyzing temperature differences of the battery cells of the battery pack according to the temperature data of each battery cell to determine whether the temperature differences of the battery cells of the battery pack are significant includes:
determining an average temperature of the temperature data of each battery cell;
respectively determining the difference value between the temperature data of each battery monomer and the average temperature;
and analyzing the temperature difference of the single batteries according to the difference value to judge whether the temperature difference of the single batteries of the battery pack is obvious.
In an embodiment of the present invention, the turning on the passive equalization switch of the at least one battery cell in advance during the charging or discharging of the battery pack includes:
starting a passive equalization switch of the at least one battery cell when the battery pack starts to be charged or discharged; or,
and after the battery pack is charged or discharged for a preset time, starting the passive equalization switch of the at least one battery monomer.
In one embodiment of the present invention, after the turning on the passive equalization switch of the at least one battery cell, the method further includes:
detecting voltage differences among the battery monomers in the battery pack;
and controlling the passive balance switch of each battery monomer in the battery pack according to the voltage difference.
An embodiment of a second aspect of the present invention provides a control apparatus for passive equalization of a battery pack, including:
the acquisition module is used for acquiring temperature data of each battery monomer in historical use of the battery pack;
the determining module is used for determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell;
and the control module is used for starting the passive equalization switch of the at least one battery cell in advance in the process of charging or discharging the battery pack.
The control device for the passive equalization of the battery pack according to the embodiment of the invention can also have the following additional technical characteristics:
in one embodiment of the invention, the determining module comprises:
and the selection unit is used for selecting the single batteries with preset proportion in the battery pack according to the temperature data of each single battery to serve as the at least one single battery needing passive equalization, wherein the temperature data of the single batteries with the preset proportion is smaller than the temperature data of other single batteries in the battery pack.
In one embodiment of the invention, the determining module comprises:
a first determination unit configured to determine a maximum value among the temperature data of the respective battery cells;
the acquiring unit is used for acquiring the difference value between the temperature data of each battery monomer and the maximum value;
and the second determining unit is used for determining that the at least one battery cell with the difference value larger than a preset threshold value is the at least one battery cell needing passive equalization.
In one embodiment of the present invention, further comprising:
the analysis module is used for carrying out temperature difference analysis on the battery monomers on the battery pack according to the temperature data of each battery monomer so as to judge whether the temperature difference of the battery monomers of the battery pack is obvious or not;
the determining module is used for determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell when the analyzing module judges that the temperature difference of the battery cells of the battery pack is obvious.
In an embodiment of the invention, the analysis module is configured to:
determining an average temperature of the temperature data of each battery cell;
respectively determining the difference value between the temperature data of each battery monomer and the average temperature;
and analyzing the temperature difference of the single batteries according to the difference value to judge whether the temperature difference of the single batteries of the battery pack is obvious.
In one embodiment of the invention, the control module is configured to:
starting a passive equalization switch of the at least one battery cell when the battery pack starts to be charged or discharged; or,
and after the battery pack is charged or discharged for a preset time, starting the passive equalization switch of the at least one battery monomer.
In one embodiment of the present invention, further comprising:
the detection module is used for detecting the voltage difference between the battery monomers in the battery pack after the passive equalization switch of the at least one battery monomer is started;
the control module is also used for controlling the passive equalization switches of all the single batteries in the battery pack according to the voltage difference.
An embodiment of a fourth aspect of the present invention provides a battery system, including: a battery pack; the passive equalization component comprises a resistance component and a passive equalization switch component; and a control device for passive equalization of a battery pack according to any one of the embodiments of the third aspect of the present invention.
An embodiment of a fourth aspect of the invention provides a vehicle including the battery system of any of the embodiments of the third aspect of the invention.
According to the control method and device for the passive equalization of the battery pack, the battery unit needing the passive equalization in the battery pack can be determined according to the temperature data of each battery unit in the battery pack in historical use, and the passive equalization switch of the battery unit meeting the preset condition is started in advance in the charging or discharging process, so that the equalization can be performed in advance in the charging or discharging process compared with the related technology when the electric quantity difference among the battery units is obvious.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method of passive equalization of a battery pack according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of passive equalization of a battery pack according to another embodiment of the present invention;
fig. 3 is a flowchart of a control method of passive equalization of a battery pack according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control apparatus for passive equalization of a battery pack according to an embodiment of the present invention;
fig. 5a is a schematic structural diagram of a control apparatus for passive equalization of a battery pack according to another embodiment of the present invention;
fig. 5b is a schematic structural diagram of a control device for passive equalization of a battery pack according to another embodiment of the present invention;
fig. 6a is a schematic structural diagram of a control device for passive equalization of a battery pack according to another embodiment of the present invention;
fig. 6b is a schematic structural diagram of a control device for passive equalization of a battery pack according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a control apparatus for passive equalization of a battery pack according to another embodiment of the present invention;
fig. 8 is a schematic structural view of a battery system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the term "plurality" means two or more; the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
A control method, apparatus, and vehicle of passive equalization of a battery pack according to an embodiment of the present invention are described below with reference to the accompanying drawings.
The vehicle according to the embodiment of the present invention may be an electric vehicle, a hybrid vehicle, or the like.
Fig. 1 is a flowchart of a control method of passive equalization of a battery pack according to an embodiment of the present invention.
As shown in fig. 1, the method for controlling the passive equalization of the battery pack according to the embodiment of the present invention includes steps S101 to S104.
And S101, acquiring temperature data of each battery cell in historical use of the battery pack.
In one embodiment of the invention, during the use of the battery pack, the temperature data of each battery cell in the battery pack can be detected by the temperature sensor and recorded.
Specifically, the temperature data of each battery cell at a certain preset time point may be recorded separately, or the temperature data of each battery cell may be recorded separately according to a preset period, so as to obtain the temperature data of each battery cell at a plurality of time points. Wherein the temperature data is synchronously detected for each battery cell at each point in time.
For example, the temperature data of each battery cell may be detected and recorded at 30 minutes after the start of charging or discharging; or the temperature data of each battery cell can be detected once every 10 minutes and recorded.
And S102, determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell.
Since the temperature rise of the battery cells is mainly due to heat energy generated by the internal resistance of the battery cells, the internal resistance magnitude relationship between the battery cells can be inferred from the temperature relationship of the battery cells, and generally, the larger the temperature value is, the larger the internal resistance is. Therefore, the internal resistance of the battery cell corresponding to the maximum value of the temperature data is maximized. The internal resistance of the battery cell having a large difference from the maximum value of the temperature data is relatively small, and equalization is required.
In an embodiment of the present invention, the at least one battery cell requiring passive equalization may be determined by, but is not limited to:
in a first mode
And selecting a preset proportion of battery monomers in the battery pack according to the temperature data of each battery monomer to serve as the at least one battery monomer needing passive equalization, wherein the temperature data of the preset proportion of battery monomers is smaller than the temperature data of other battery monomers in the battery pack.
That is, a preset proportion of battery cells with smaller temperature data can be selected from the battery pack as at least one battery cell requiring passive equalization according to the size of the temperature data of each battery cell.
The preset proportion can be determined according to historical experience or experimental data.
For example, the battery pack includes 10 battery cells in total, and the preset ratio is 30%, and then 3 battery cells with the minimum temperature can be used as at least one battery cell requiring passive equalization.
Mode two
As shown in fig. 2b, comparing the difference of the temperature data between each battery cell and the battery cell with the highest temperature, and using the battery cell with obvious difference as the battery cell to be equalized, specifically, the method may include the following steps:
and S201, determining the maximum value in the temperature data of each battery cell.
S202, acquiring the difference value between the temperature data of each battery cell and the maximum value.
S203, determining at least one battery cell of which the difference value is greater than a preset threshold value as the at least one battery cell needing passive equalization.
Therefore, the single battery with obvious difference with the single battery with the largest internal resistance, namely the single battery with smaller internal resistance can be determined, so that the passive equalization switches of the single batteries are started in advance in the subsequent charging or discharging process to access the single equalization group of the single batteries, the passive equalization is performed in advance, and the problems that the equalization time is too long and even the equalization cannot be completed due to the fact that the equalization is started only when the energy difference among the single batteries is obvious can be solved.
Further, in order to improve the accuracy of determining the at least one battery cell requiring passive equalization, in one embodiment of the present invention, before determining the accuracy of the at least one battery cell requiring passive equalization, the method may further include the steps of: and performing temperature difference analysis on the battery monomers on the battery pack according to the temperature data of each battery monomer to judge whether the temperature difference of the battery monomers of the battery pack is obvious, and determining at least one battery monomer which needs to be passively balanced in the battery pack according to the temperature data of each battery monomer when the temperature difference of the battery monomers of the battery pack is judged to be obvious.
Wherein, the difference analysis is an analysis for judging whether the difference between each data in a group of data is significant. In some embodiments of the present invention, whether the temperature difference of the battery cell is significant can be determined through statistics such as variance, standard deviation, and variation coefficient.
In one embodiment of the present invention, it is also possible to directly determine whether the temperature difference of the battery cells of the battery pack is significant according to the difference between the maximum value and the minimum value of the temperature data. Wherein, when a difference between the maximum value and the minimum value of the temperature data is greater than a preset difference, it may be determined that the temperature difference of the battery cells of the battery pack is significant.
In an embodiment of the present invention, analyzing the temperature difference of the battery cells of the battery pack according to the temperature data of each battery cell to determine whether the temperature difference of the battery cells of the battery pack is significant may specifically include: determining an average temperature of the temperature data of each battery cell; respectively determining the difference value between the temperature data of each battery monomer and the average temperature; and analyzing the temperature difference of the single batteries according to the difference value to judge whether the temperature difference of the single batteries of the battery pack is obvious.
The analyzing the temperature difference of the battery cells according to the difference may include, but is not limited to, calculating a variance, a standard deviation, or a coefficient of variation according to the difference, and performing the analyzing the temperature difference of the battery cells.
For example, the variance of the temperature data of each battery cell may be calculated according to the difference, and if the variance is greater than a preset value, it may be determined that the temperature difference of the battery cells of the battery pack is significant and the corresponding battery cells in the battery pack need to be equalized. If the variance is not greater than the preset threshold, it can be determined that the temperature difference of the battery cells of the battery pack is not significant, that is, the internal resistance difference of each battery cell in the battery pack is not large, and then the equalization does not need to be started in advance.
It should be noted that, for the temperature data recorded at the preset time point, the temperature data corresponding to the preset time point may be directly used to perform the temperature difference analysis of the battery cell. Corresponding to the temperature data recorded according to a preset period, selecting a temperature data record of a time point from the recorded records corresponding to a plurality of time points according to needs for analysis; or respectively analyzing the records corresponding to each time point, and summarizing according to the analysis results of each time point to determine whether the temperature difference of the single batteries of the battery pack is obvious.
And S103, in the process of charging or discharging the battery pack, starting the passive equalization switch of the at least one battery cell in advance.
In one embodiment of the present invention, the passive equalization switch of the at least one battery cell may be turned on when the battery pack starts to be charged or discharged. Or, after the battery pack is charged or discharged for a preset time, the passive equalization switch of the at least one battery cell may be turned on. The preset time can be set according to experience or experimental data.
According to the control method for the passive equalization of the battery pack, the battery monomers needing the passive equalization in the battery pack can be determined according to the temperature data of each battery monomer in the battery pack in historical use, and the passive equalization switch of the battery monomer meeting the preset conditions is started in advance in the charging or discharging process, so that the equalization can be performed in advance in the charging or discharging process compared with the related technology when the electric quantity difference among the battery monomers is obvious.
Fig. 3 is a flowchart illustrating a method of controlling passive equalization of a battery pack according to another embodiment of the present invention.
As shown in fig. 3, the method for controlling the passive equalization of the battery pack according to the embodiment of the present invention includes steps S301 to S305.
Steps S301 to S303 are the same as steps S101 to S103 in the embodiment shown in fig. 1, and reference may be made to the embodiment shown in fig. 1.
And S304, detecting the voltage difference between the single batteries in the battery pack.
And S305, controlling the passive equalization switches of the single batteries in the battery pack according to the voltage difference.
After the passive equalization switch of the battery cell needing equalization is turned on, the battery cell needing equalization starts to equalize voltage through the resistor connected in series. In order to avoid excessive power consumption of the serially connected resistors and excessive equalization, the voltage difference between each battery cell in the battery pack can be detected in the equalization process, and the passive equalization switch of each battery cell in the battery pack is controlled according to the voltage difference. Therefore, when the voltage of the battery cell which starts the passive equalization switch is higher than the voltages of other battery cells by a certain value, the equalization switch is closed, and the over-equalization is avoided.
Corresponding to the embodiment of the control method for the passive equalization of the battery pack, the invention also provides a control device for the passive equalization of the battery pack.
Fig. 4 is a schematic structural diagram of a control apparatus for passive equalization of a battery pack according to an embodiment of the present invention.
As shown in fig. 4, the control apparatus for passive equalization of a battery pack according to an embodiment of the present invention includes: an acquisition module 10, a determination module 20 and a control module 30.
Specifically, the obtaining module 10 is used for obtaining temperature data of each battery cell in the historical use of the battery pack.
In one embodiment of the invention, during the use of the battery pack, the temperature data of each battery cell in the battery pack can be detected by the temperature sensor and recorded.
Specifically, the temperature data of each battery cell at a certain preset time point may be recorded separately, or the temperature data of each battery cell may be recorded separately according to a preset period, so as to obtain the temperature data of each battery cell at a plurality of time points. Wherein the temperature data is synchronously detected for each battery cell at each point in time.
For example, the temperature data of each battery cell may be detected and recorded at 30 minutes after the start of charging or discharging; or the temperature data of each battery cell can be detected once every 10 minutes and recorded.
The determining module 20 is configured to determine at least one battery cell in the battery pack that needs to be passively equalized according to the temperature data of each battery cell.
Since the temperature rise of the battery cells is mainly due to heat energy generated by the internal resistance of the battery cells, the internal resistance magnitude relationship between the battery cells can be inferred from the temperature relationship of the battery cells, and generally, the larger the temperature value is, the larger the internal resistance is. Therefore, the internal resistance of the battery cell corresponding to the maximum value of the temperature data is maximized. The internal resistance of the battery cell having a large difference from the maximum value of the temperature data is relatively small, and equalization is required.
In an embodiment of the present invention, the determination module 20 may determine the at least one battery cell requiring passive equalization by, but not limited to:
in a first mode
As shown in fig. 5a, the determination module 20 may comprise a selection unit 21.
The selecting unit 21 is configured to select, in the battery pack, a preset ratio of battery cells as the at least one battery cell requiring passive equalization according to the temperature data of each battery cell, where the temperature data of the preset ratio of battery cells is smaller than the temperature data of other battery cells in the battery pack.
That is, the selection unit 21 may select a preset proportion of the battery cells having smaller temperature data from the battery pack as the at least one battery cell requiring passive equalization according to the size of the temperature data of the respective battery cells.
The preset proportion can be determined according to historical experience or experimental data.
For example, the battery pack includes 10 battery cells in total, and the preset ratio is 30%, and then 3 battery cells with the minimum temperature can be used as at least one battery cell requiring passive equalization.
Mode two
As shown in fig. 5b, the determining module 20 may compare the difference of the temperature data between each battery cell and the battery cell with the highest temperature, and use the battery cell with the obvious difference as the battery cell to be equalized. Specifically, the determination module 20 may include: a first determining unit 22, an obtaining unit 23 and a second determining unit 24.
The first determination unit 22 is configured to determine a maximum value in the temperature data of each battery cell.
The obtaining unit 23 is configured to obtain a difference between the temperature data of each battery cell and the maximum value.
The second determining unit 24 is configured to determine that the at least one battery cell with the difference value larger than the preset threshold is the at least one battery cell requiring passive equalization.
Therefore, the single battery with obvious difference with the single battery with the largest internal resistance, namely the single battery with smaller internal resistance can be determined, so that the passive equalization switches of the single batteries are started in advance in the subsequent charging or discharging process to access the single equalization group of the single batteries, the passive equalization is performed in advance, and the problems that the equalization time is too long and even the equalization cannot be completed due to the fact that the equalization is started only when the energy difference among the single batteries is obvious can be solved.
The control module 30 is configured to turn on the passive equalization switch of the at least one battery cell in advance during charging or discharging of the battery pack.
In one embodiment of the present invention, the control module 30 may be configured to: and when the battery pack starts to be charged or discharged, the passive equalization switch of the at least one battery cell is started.
In one embodiment of the present invention, the control module 30 may be configured to: and after the battery pack is charged or discharged for a preset time, starting the passive equalization switch of the at least one battery monomer. The preset time can be set according to experience or experimental data.
Further, in order to improve the accuracy of determining at least one battery cell requiring passive equalization, in an embodiment of the present invention, the control device for passive equalization of the battery pack, as shown in fig. 6a and 6b, may further include, on the basis of fig. 5a and 5 b: an analysis module 40.
The analysis module 40 is configured to perform temperature difference analysis on the battery cells of the battery pack according to the temperature data of each battery cell to determine whether the temperature difference of the battery cells of the battery pack is significant.
The determining module 20 is configured to determine at least one battery cell in the battery pack that needs to be passively balanced according to the temperature data of each battery cell when the analyzing module 40 determines that the temperature difference of the battery cells of the battery pack is significant.
Wherein, the difference analysis is an analysis for judging whether the difference between each data in a group of data is significant. In some embodiments of the present invention, the analysis module 40 may determine whether the temperature difference of the battery cells is significant through statistics such as variance, standard deviation, and variation coefficient.
In one embodiment of the present invention, the analysis module 40 may also directly determine whether the temperature difference of the battery cells of the battery pack is significant according to the difference between the maximum value and the minimum value of the temperature data. Wherein, when a difference between the maximum value and the minimum value of the temperature data is greater than a preset difference, it may be determined that the temperature difference of the battery cells of the battery pack is significant.
In one embodiment of the present invention, the analysis module 40 may be configured to: determining an average temperature of the temperature data of each battery cell; respectively determining the difference value between the temperature data of each battery monomer and the average temperature; and analyzing the temperature difference of the single batteries according to the difference value to judge whether the temperature difference of the single batteries of the battery pack is obvious.
The analyzing the temperature difference of the battery cells according to the difference may include, but is not limited to, calculating a variance, a standard deviation, or a coefficient of variation according to the difference, and performing the analyzing the temperature difference of the battery cells.
For example, the analysis module 40 may calculate a variance of the temperature data of each battery cell according to the difference, and if the variance is greater than a preset value, it may be determined that the temperature difference of the battery cells of the battery pack is significant and the corresponding battery cells in the battery pack need to be equalized. If the variance is not greater than the preset threshold, it can be determined that the temperature difference of the battery cells of the battery pack is not significant, that is, the internal resistance difference of each battery cell in the battery pack is not large, and then the equalization does not need to be started in advance.
It should be noted that, for the temperature data recorded at the preset time point, the temperature data corresponding to the preset time point may be directly used to perform the temperature difference analysis of the battery cell. Corresponding to the temperature data recorded according to a preset period, selecting a temperature data record of a time point from the recorded records corresponding to a plurality of time points according to needs for analysis; or respectively analyzing the records corresponding to each time point, and summarizing according to the analysis results of each time point to determine whether the temperature difference of the single batteries of the battery pack is obvious.
According to the control device for the passive equalization of the battery pack, disclosed by the embodiment of the invention, the battery monomer needing the passive equalization in the battery pack can be determined according to the temperature data of each battery monomer in the battery pack in historical use, and the passive equalization switch of the battery monomer meeting the preset condition is started in advance in the charging or discharging process, so that the equalization can be performed in advance when the electric quantity difference among the battery monomers is obvious in the related technology.
Fig. 7 is a schematic structural diagram of a control apparatus for passive equalization of a battery pack according to another embodiment of the present invention.
As shown in fig. 7, the control apparatus for passive equalization of a battery pack according to an embodiment of the present invention includes: an acquisition module 10, a determination module 20, a control module 30, and a detection module 50.
The obtaining module 10, the determining module 20 and the control module 30 are the same as the embodiment shown in fig. 4, and reference may be made to the embodiment shown in fig. 4.
The detection module 50 is configured to detect a voltage difference between the battery cells in the battery pack after the passive equalization switch of the at least one battery cell is turned on.
The control module 30 is further configured to control a passive equalization switch of each battery cell in the battery pack according to the voltage difference.
After the passive equalization switch of the battery cell needing equalization is turned on, the battery cell needing equalization starts to equalize voltage through the resistor connected in series. In order to avoid excessive power consumption of the serially connected resistors and excessive equalization, the voltage difference between each battery cell in the battery pack can be detected in the equalization process, and the passive equalization switch of each battery cell in the battery pack is controlled according to the voltage difference. Therefore, when the voltage of the battery cell which starts the passive equalization switch is higher than the voltages of other battery cells by a certain value, the equalization switch is closed, and the over-equalization is avoided.
The invention also provides a battery system.
Fig. 8 is a schematic structural view of a battery system according to an embodiment of the present invention.
As shown in fig. 8, a battery system according to an embodiment of the present invention includes: a battery pack 100, a passive equalization assembly 200 and a control device 300 for passive equalization of a battery pack.
The passive equalization component 200 includes a resistive component 210 and a passive equalization switch component 220. After the ith resistor in the resistor component 210 is connected in series with the ith passive equalization switch in the passive equalization switch component 220, the ith resistor is connected in series with the ith battery cell in the battery pack 100, i is an integer greater than 1 and less than or equal to N, and N is the number of battery cells in the battery pack 100.
The control device 300 for passive equalization of a battery pack may be a control device for passive equalization of a battery pack according to any embodiment of the present invention.
According to the battery system provided by the embodiment of the invention, the battery monomers needing passive equalization in the battery pack can be determined according to the temperature data of each battery monomer in the battery pack in historical use, and the passive equalization switch of the battery monomer meeting the preset condition is started in advance in the charging or discharging process, so that the equalization can be performed in advance when the electric quantity difference among the battery monomers is obvious in the related technology.
The invention also provides a vehicle.
According to the vehicle provided by the embodiment of the invention, the control device for the passive equalization of the battery pack provided by any embodiment of the invention can determine the battery cells needing the passive equalization in the battery pack according to the temperature data of each battery cell in the battery pack in historical use, and the passive equalization switch of the battery cell meeting the preset condition is started in advance in the charging or discharging process, so that compared with the prior art in which the equalization is performed when the electric quantity difference among the battery cells is obvious, the equalization can be performed in advance in the charging or discharging process according to the embodiment of the invention, the equalization time can be effectively shortened, the problem that part of the battery cells are charged completely but not balanced completely can be solved, and the equalization effect is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for controlling passive equalization of a battery pack, comprising the steps of:
acquiring temperature data of each battery monomer in historical use of the battery pack;
determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell;
and in the process of charging or discharging the battery pack, the passive equalization switch of the at least one battery cell is started in advance.
2. The method of claim 1, wherein the determining at least one cell in the battery pack that requires passive equalization based on the temperature data of the respective cells comprises:
and selecting a preset proportion of battery monomers in the battery pack according to the temperature data of each battery monomer to serve as the at least one battery monomer needing passive equalization, wherein the temperature data of the preset proportion of battery monomers is smaller than the temperature data of other battery monomers in the battery pack.
3. The method of claim 1, wherein the determining at least one cell in the battery pack that requires passive equalization based on the temperature data of the respective cells comprises:
determining a maximum value in the temperature data of each battery cell;
acquiring the difference value between the temperature data of each battery monomer and the maximum value;
and determining at least one battery cell of which the difference is greater than a preset threshold value as the at least one battery cell needing passive equalization.
4. The method of any one of claims 1-3, further comprising:
performing temperature difference analysis on the battery monomers on the battery pack according to the temperature data of each battery monomer to judge whether the temperature difference of the battery monomers of the battery pack is obvious or not;
when the temperature difference of the battery monomers of the battery pack is judged to be remarkable, at least one battery monomer needing passive equalization in the battery pack is determined according to the temperature data of each battery monomer.
5. The method of claim 4, wherein the analyzing the temperature difference of the battery cells of the battery pack according to the temperature data of each battery cell to determine whether the temperature difference of the battery cells of the battery pack is significant comprises:
determining an average temperature of the temperature data of each battery cell;
respectively determining the difference value between the temperature data of each battery monomer and the average temperature;
and analyzing the temperature difference of the single batteries according to the difference value to judge whether the temperature difference of the single batteries of the battery pack is obvious.
6. The method of claim 1, wherein the pre-starting the passive equalization switch of the at least one cell during the charging or discharging of the battery pack comprises:
starting a passive equalization switch of the at least one battery cell when the battery pack starts to be charged or discharged; or,
and after the battery pack is charged or discharged for a preset time, starting the passive equalization switch of the at least one battery monomer.
7. The method of any of claims 1-6, further comprising, after the turning on the passive equalization switch of the at least one cell:
detecting voltage differences among the battery monomers in the battery pack;
and controlling the passive balance switch of each battery monomer in the battery pack according to the voltage difference.
8. A control apparatus for passive equalization of a battery pack, comprising:
the acquisition module is used for acquiring temperature data of each battery monomer in historical use of the battery pack;
the determining module is used for determining at least one battery cell needing passive equalization in the battery pack according to the temperature data of each battery cell;
and the control module is used for starting the passive equalization switch of the at least one battery cell in advance in the process of charging or discharging the battery pack.
9. A battery system, comprising:
a battery pack;
the passive equalization component comprises a resistance component and a passive equalization switch component; and
control means for passive equalization of a battery pack according to claim 8;
the battery pack comprises a resistor assembly, a passive equalization switch assembly and a resistor assembly, wherein the ith resistor in the resistor assembly is connected with the ith passive equalization switch in the passive equalization switch assembly in series and then connected with the ith battery monomer in the battery pack in series, i is an integer larger than 1 and smaller than or equal to N, and N is the number of the battery monomers in the battery pack.
10. A vehicle, characterized by comprising: the battery system of claim 9.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN108879818A (en) * | 2018-06-06 | 2018-11-23 | 安徽锐能科技有限公司 | Passive equalization methods for battery pack |
| CN110015180A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN111009945A (en) * | 2019-12-25 | 2020-04-14 | 孚能科技(赣州)股份有限公司 | Photoelectric conversion-based battery pack equalization circuit and equalization method |
| CN111446760A (en) * | 2020-04-14 | 2020-07-24 | 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361100A (en) * | 2011-10-19 | 2012-02-22 | 奇瑞汽车股份有限公司 | Method for controlling balance of power lithium ion battery |
| CN103427121A (en) * | 2012-05-23 | 2013-12-04 | 固纬电子实业股份有限公司 | battery module |
| US20130335036A1 (en) * | 2012-06-15 | 2013-12-19 | Tao Zhang | Balance charging detector |
| CN103812150A (en) * | 2012-11-08 | 2014-05-21 | 国家电网公司 | Cell equalization method and device |
| CN104852414A (en) * | 2014-02-19 | 2015-08-19 | 东莞钜威新能源有限公司 | Equalization method and device of battery pack cells |
| CN105226768A (en) * | 2015-10-30 | 2016-01-06 | 广州极飞电子科技有限公司 | A kind of equalization methods of intelligent battery and intelligent battery |
| CN105871019A (en) * | 2016-05-11 | 2016-08-17 | 安徽锐能科技有限公司 | Passive balance control method |
-
2016
- 2016-09-19 CN CN201610833281.8A patent/CN106340920B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361100A (en) * | 2011-10-19 | 2012-02-22 | 奇瑞汽车股份有限公司 | Method for controlling balance of power lithium ion battery |
| CN103427121A (en) * | 2012-05-23 | 2013-12-04 | 固纬电子实业股份有限公司 | battery module |
| US20130335036A1 (en) * | 2012-06-15 | 2013-12-19 | Tao Zhang | Balance charging detector |
| CN103812150A (en) * | 2012-11-08 | 2014-05-21 | 国家电网公司 | Cell equalization method and device |
| CN104852414A (en) * | 2014-02-19 | 2015-08-19 | 东莞钜威新能源有限公司 | Equalization method and device of battery pack cells |
| CN105226768A (en) * | 2015-10-30 | 2016-01-06 | 广州极飞电子科技有限公司 | A kind of equalization methods of intelligent battery and intelligent battery |
| CN105871019A (en) * | 2016-05-11 | 2016-08-17 | 安徽锐能科技有限公司 | Passive balance control method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110015180A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| 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 |
| 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 |
| CN108879818A (en) * | 2018-06-06 | 2018-11-23 | 安徽锐能科技有限公司 | Passive equalization methods for battery pack |
| CN111009945A (en) * | 2019-12-25 | 2020-04-14 | 孚能科技(赣州)股份有限公司 | Photoelectric conversion-based battery pack equalization circuit and equalization method |
| 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 |
| CN111446760A (en) * | 2020-04-14 | 2020-07-24 | 深圳欣旺达智能科技有限公司 | Battery equalization management method, circuit, device and storage medium |
| 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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|---|---|
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