CN109061479B - Battery pack unbalance analysis method and charging device - Google Patents
Battery pack unbalance analysis method and charging device Download PDFInfo
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Abstract
The application relates to a battery pack unbalance analysis method and a charging device, and belongs to the field of battery pack charging. The analysis method for the unbalance degree of the battery pack comprises the following steps: constructing a voltage-time curve model of the single battery in the constant current charging period under a rectangular coordinate system; when the battery pack is charged with constant current, respectively and correspondingly acquiring a first sampling voltage and a second sampling voltage of each single battery at a first sampling time and a second sampling time; configuring the first sampling voltage and the second sampling voltage on a voltage-time curve model to obtain an area under a curve; and configuring a preset reference starting point on the voltage-time curve model, obtaining a reference end point of each single battery through the area under the curve, and taking the reference time difference as unbalance degree data. This application can provide unbalance degree data in the battery pack earlier stage of charging, provides the basis for unbalance recovery control in the battery pack earlier stage of charging to effectively shorten the total charge time of battery pack.
Description
Technical Field
The application belongs to the field of battery pack charging, and particularly relates to a battery pack unbalance analysis method and a charging device.
Background
The battery pack is composed of a plurality of single batteries, on one hand, parameters of each single battery are different, on the other hand, parameters of the single batteries are different due to the influence of environmental temperature in the using process of the battery pack, so that voltages among the single batteries are different, and the battery pack is unbalanced. The battery pack requires imbalance recovery during each charging process.
Taking a lithium battery pack as an example, the unbalance recovery in the charging process of the lithium battery pack at present is to perform balance control at the charging end, that is, to perform balance control on each single battery at the stage of fast completion of the charging process. However, the cell voltage with high capacity at the charging end easily reaches the full-charge state, so that the charger is forced to stop charging, otherwise, danger occurs. After the voltage of the single battery with high voltage is reduced, if discharge control is adopted, the lithium battery pack can be continuously charged, the repeated process can last for a long time, and the total charging time is greatly prolonged.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the present application provides a method for analyzing the unbalance degree of a battery pack and a charging device.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a battery pack unbalance analysis method, the battery pack including a plurality of unit cells, comprising:
constructing a voltage-time curve model of the single battery in the constant current charging period under a rectangular coordinate system;
when the battery pack is charged with a constant current,
acquiring a first sampling voltage of each single battery at a first sampling moment, and acquiring a second sampling voltage of each single battery at a second sampling moment;
arranging the first sampling voltage of the ith single battery on the voltage-time curve model to form a first sampling point; and configuring the second sampled voltage of the ith single battery on the voltage-time curve model to form a second sampling point; obtaining an area S under a curve of a curve between the first sampling point and the second sampling point of the ith single batteryi(ii) a Wherein i is a positive integer;
configuring a preset reference starting point on the voltage-time curve model, and acquiring reference starting point time corresponding to the preset reference starting point;
configuring a reference terminal point of the ith single battery on the voltage-time curve model so that the area under the curve of the curve between the preset reference starting point and the reference terminal point of the ith single battery is equal to Si；
Acquiring a reference end point time corresponding to the reference end point of each single battery;
and acquiring a reference time difference of each single battery to serve as unbalance degree data, wherein the reference time difference is obtained by subtracting the reference starting point time from the reference end point time.
Further, the first sampling time is the initial constant current charging time of the battery pack.
Further, when the initial constant current charging time of the battery pack is taken as the first sampling time, the first sampling voltage with the minimum voltage value among the acquired first sampling voltages of the single batteries is taken as a preset reference starting point voltage, and the preset reference starting point voltage is configured on the voltage-time curve model to obtain the preset reference starting point.
Further, the battery pack is a lithium battery pack.
Further, the voltage-time curve model is obtained by the following formula:
U＝3.38–0.66×T+(1.04×T–1.08)/Lg(T)
wherein T is a time per unit value, and U is the voltage of the single battery.
Further, an area under a curve S of a curve between the first sampling point and the second sampling point of the ith single batteryiObtained by the following formula:
Si＝(Ui1+Ui2)*(Ti2-Ti1)/2
wherein, Ui1The first sampling voltage, U, of the ith celli2The second sampling voltage, T, for the ith celli1Corresponding time, T, on the voltage-time curve model for the first sampling voltage of the ith single batteryi2And the corresponding time of the second sampling voltage of the ith single battery on the voltage-time curve model is obtained.
Further, an area under a curve S of a curve between the first sampling point and the second sampling point of the ith single batteryiObtained by the following method:
and performing curve integration between the first sampling point and the second sampling point of the ith single battery.
A charging device that employs the battery pack unbalance analysis method of any one of the above-described methods when charging.
Further, charging device is electric automobile charging pile.
Further, the charging device is an unmanned aerial vehicle charger.
This application adopts above technical scheme, possesses following beneficial effect at least:
according to the method, the voltage-time curve model of the battery pack in the constant current charging period is established, the voltage of each single battery is collected in the constant current charging stage of the battery pack and is configured into the voltage-time curve model, the reference time difference reflecting the unbalance degree of each single battery is obtained through area conversion under the curve, unbalance degree data in the time aspect is provided for unbalance recovery of the battery pack in the early charging period, the reference time difference is used as the unbalance degree data to provide the basis in the time aspect for unbalance recovery control in the early charging period of the battery pack, and therefore the total charging time of the battery pack is effectively shortened.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an analysis diagram in which a first sampling voltage and a second sampling voltage of an ith cell are arranged on a voltage-time curve model.
FIG. 2 shows a battery pack having four single cells, wherein a predetermined reference starting point origin is configured on the voltage-time curve model, and the area S under the curve corresponding to each single cell is defined byiAcquiring a reference End point End corresponding to each single battery on the voltage-time curve modeli。
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a battery pack unbalance degree analysis method and a charging device, and the application is described in detail below with reference to the accompanying drawings.
In one embodiment of the present application, there is provided a method for analyzing an unbalance degree of a battery pack including a plurality of unit batteries, including:
constructing a voltage-time curve model of the single battery in the constant current charging period under a rectangular coordinate system;
when the battery pack is charged with a constant current,
acquiring a first sampling voltage of each single battery at a first sampling moment, and acquiring a second sampling voltage of each single battery at a second sampling moment;
arranging the first sampling voltage of the ith single battery on the voltage-time curve model to form a first sampling point; and configuring the second sampled voltage of the ith single battery on the voltage-time curve model to form a second sampling point; obtaining an area S under a curve of a curve between the first sampling point and the second sampling point of the ith single batteryi(ii) a Wherein i is a positive integer;
configuring a preset reference starting point on the voltage-time curve model, and acquiring reference starting point time corresponding to the preset reference starting point;
configuring a reference terminal point of the ith single battery on the voltage-time curve model so that the area under the curve of the curve between the preset reference starting point and the reference terminal point of the ith single battery is equal to Si；
Acquiring a reference end point time corresponding to the reference end point of each single battery;
and acquiring a reference time difference of each single battery to serve as unbalance degree data, wherein the reference time difference is obtained by subtracting the reference starting point time from the reference end point time.
The above scheme of the present application is further explained below in conjunction with a constant-current constant-voltage charging mode of the battery pack.
In the related art, the initial stage of constant-current and constant-voltage charging of the battery pack is a constant-current charging mode, which means that the charging current is constant, and the charging voltage gradually rises along with the progress of the charging time. Although there is a difference in voltage between the individual cells of the battery pack, the individual cells have the same voltage-time variation during constant current charging, see the voltage-time variation shown in fig. 1 and 2. The unbalance of each single battery in the battery pack is expressed at the same moment, and each single battery presents different voltages.
This application is through obtaining first sampling moment in the constant current charging process each the first sampled voltage of battery cell, and second sampling moment is each the second sampled voltage of battery cell, as shown in fig. 1, fig. 1 demonstrates to dispose the first sampled voltage and the second sampled voltage of ith battery cell to voltage-time curve model on, correspond and form first sampling point and second sampling point, then obtain the area under the curve of curve between first sampling point and the second sampling point, every battery cell corresponds area S under the curve like thisi。
As shown in fig. 2, fig. 2 illustrates an embodiment in which the battery pack has four single batteries, and fig. 2 arranges a preset reference starting point origin on the voltage-time curve model, passing through the area S under the curve corresponding to each single batteryiAcquiring a reference End point End corresponding to each single battery on the voltage-time curve modeliIn the figure, the reference End points of four single batteries are respectively and sequentially corresponding to End1、End2、End3、End4. Presetting reference starting point time T corresponding to the reference starting point origin for each single batteryOrignThe same reference end point time T corresponding to the reference end point of each single batteryEndiDifferently, a reference time difference (T) of each unit cell is formedEndi-TOrign) The difference in the imbalance degree data is obtained by using the reference time difference of each unit cell, and the imbalance degree of each unit cell is reflected in time.
According to the method, the voltage-time curve model of the battery pack in the constant current charging period is established, the voltage of each single battery is collected in the constant current charging stage of the battery pack and is configured into the voltage-time curve model, the reference time difference reflecting the unbalance degree of each single battery is obtained through area conversion under the curve, unbalance degree data in the aspect of time is provided for unbalance recovery of the battery pack in the early stage of charging, the reference time difference serves as the unbalance degree data to provide a basis for unbalance recovery control of the battery pack in the early stage of charging, and therefore the total charging time of the battery pack is effectively shortened.
The following defects existing in the prior art when the balance control is carried out through the charging tail end can be avoided through the method and the device for charging the battery pack: because of the high battery cell voltage of the terminal capacity that charges very easily reaches full charge voltage state, cause the charger can be forced to stop charging, wait for after the high battery cell voltage of voltage drops, if take discharge control, just can continue to charge lithium cell group, this process is repeated repeatedly can the duration longer, has greatly increased total charge time.
In one embodiment of the present application, the first sampling time is an initial constant current charging time of the battery pack.
According to the scheme, the initial constant-current charging time of the battery pack is set as a first sampling time, the sampling is started to obtain the voltage difference of each single battery at the charging starting time, the voltage state condition of each single battery of the battery pack during charging is combined with the battery pack unbalance degree analysis method, the first sampling voltage of each single battery can be obtained at the fastest speed, and the actual voltage condition of each single battery of the battery pack at the charging starting time can be obtained.
In an embodiment of the application, when the initial constant current charging time of the battery pack is taken as the first sampling time, the first sampling voltage with the minimum voltage value among the first sampling voltages of the single batteries is taken as a preset reference starting point voltage, and the preset reference starting point voltage is configured on the voltage-time curve model to obtain the preset reference starting point.
According to the scheme, the first sampling voltage with the minimum voltage value is used as the preset reference starting point voltage in the first sampling voltages of the single batteries obtained by sampling at the initial constant-current charging moment of the battery pack, the reference time difference which is obtained under the scheme and is used as unbalance data is used, the single battery with the minimum voltage value in the initial charging process is used as the unbalance reference standard, and the unbalance condition of each single battery can be reflected more visually.
And obtaining a voltage-time curve model of the battery pack during constant current charging, wherein the battery pack has the same voltage-time change curve during the constant current charging although the battery pack has different single batteries. Based on this, in an embodiment of the present application, taking the battery pack as an example of a lithium battery pack, the present application provides the following modeling formula:
U＝3.38–0.66×T+(1.04×T–1.08)/Lg(T)
wherein T is a time per unit value, and U is the voltage of the single battery.
Taking the voltage-time curve model formed by the modeling formula as an example, when the curve between the first sampling point and the second sampling point is short, the graph under the curve can be regarded as a trapezoid, and then
Area under the curve S of the curve between the first sampling point and the second sampling point of the ith single batteryiObtained by the following formula:
Si＝(Ui1+Ui2)*(Ti2-Yi1)/2
wherein, Ui1The first sampling voltage, U, of the ith celli2The second sampling voltage, T, for the ith celli1The corresponding time (shown in figure 1) of the first sampling voltage of the ith single battery on the voltage-time curve model is Ti2The corresponding time of the second sampling voltage of the ith single battery on the voltage-time curve model (shown in figure 1) is adopted.
As a more accurate way of obtaining the area under the curve, the ith place of the single batteryAn area under a curve S of a curve between the first sampling point and the second sampling pointiObtained by the following method:
and performing curve integration between the first sampling point and the second sampling point of the ith single battery.
The area under the curve obtained by integrating the curve is the application in the related technology, when the method is applied in the application, the second sampling time can obtain a loose set degree of freedom, for example, a longer sampling interval can be set according to the requirement for the interval between the second sampling time and the first sampling time, so that the problem that the area under the curve is not enough can be solved, namely, the graph under the curve can be regarded as a trapezoid, so that the set of the second sampling point is limited, and the curve between the first sampling point and the second sampling point is required to be shorter. Under the constraint, when the charging current is small, the voltage change of the single battery at the second sampling time and the first sampling time is possibly small, the difference of the obtained unbalance degree data of each single battery is not obvious, the area under the curve is obtained by integrating the curve, the obtained area is the real area, and therefore, the second sampling point and the first sampling point can be set with a long time interval to meet the requirements of the charging currents with different sizes.
In one embodiment of the present application, a charging device for implementing the above method embodiments is also provided.
A charging device that employs the battery pack unbalance analysis method of any one of the above-described methods when charging.
The specific implementation method of the charging device according to the above-mentioned scheme has been described in detail in the above-mentioned related embodiments of the present application, and will not be described in detail herein.
In a specific application, the charging device can be an electric automobile charging pile.
In a specific application, the charging device can also be an unmanned aerial vehicle charger.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
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 the scope of the preferred embodiments of the present application includes other implementations 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 application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
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 application 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.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above do not necessarily 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.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for analyzing an unbalance degree of a battery pack including a plurality of unit batteries, comprising:
constructing a voltage-time curve model of the single battery in the constant current charging period under a rectangular coordinate system;
when the battery pack is charged with a constant current,
acquiring a first sampling voltage of each single battery at a first sampling moment, and acquiring a second sampling voltage of each single battery at a second sampling moment;
sampling the first sample of the ith single batteryVoltage is configured on the voltage-time curve model to form a first sampling point; and configuring the second sampled voltage of the ith single battery on the voltage-time curve model to form a second sampling point; obtaining an area S under a curve of a curve between the first sampling point and the second sampling point of the ith single batteryi(ii) a Wherein i is a positive integer;
configuring a preset reference starting point on the voltage-time curve model, and acquiring reference starting point time corresponding to the preset reference starting point; configuring a reference terminal point of the ith single battery on the voltage-time curve model so that the area under the curve of the curve between the preset reference starting point and the reference terminal point of the ith single battery is equal to Si；
Acquiring a reference end point time corresponding to the reference end point of each single battery;
and acquiring a reference time difference of each single battery to serve as unbalance degree data, wherein the reference time difference is obtained by subtracting the reference starting point time from the reference end point time.
2. The battery pack imbalance analysis method according to claim 1, wherein the first sampling time is an initial constant current charging time of the battery pack.
3. The battery pack imbalance analysis method according to claim 2, wherein when the initial constant current charging time of the battery pack is taken as the first sampling time, the first sampling voltage with the smallest voltage value among the first sampling voltages of the single batteries is taken as a preset reference starting point voltage, and the preset reference starting point voltage is configured on the voltage-time curve model to obtain the preset reference starting point.
4. The battery imbalance analysis method according to claim 1, wherein the battery is a lithium battery.
5. The battery pack unbalance degree analysis method according to claim 4,
the voltage-time curve model is obtained by the following formula:
U＝3.38–0.66×T+(1.04×T–1.08)/Lg(T)；
wherein T is a time per unit value, and U is the voltage of the single battery.
6. The battery pack unbalance degree analysis method according to claim 1, wherein an area S under a curve between the first sampling point and the second sampling point of the ith celliObtained by the following formula:
Si＝(Ui1+Ui2)*(Ti2-Ti1)/2；
wherein, Ui1The first sampling voltage, U, of the ith celli2The second sampling voltage, T, for the ith celli1Corresponding time, T, on the voltage-time curve model for the first sampling voltage of the ith single batteryi2And the corresponding time of the second sampling voltage of the ith single battery on the voltage-time curve model is obtained.
7. The battery pack unbalance degree analysis method according to claim 1, wherein an area S under a curve between the first sampling point and the second sampling point of the ith celliObtained by the following method:
and performing curve integration between the first sampling point and the second sampling point of the ith single battery.
8. A charging device, characterized by: the charging device employs the battery unbalance degree analysis method according to any one of claims 1 to 7 when charging.
9. The charging device according to claim 8, wherein: the charging device is an electric automobile charging pile.
10. The charging device according to claim 8, wherein: the charging device is an unmanned aerial vehicle charger.
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