CN113484756A - Balanced discharge management method for storage battery pack - Google Patents
Balanced discharge management method for storage battery pack Download PDFInfo
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Abstract
The invention discloses a method for managing the balanced discharge of a storage battery pack, which comprises the steps of calculating the charge state value of each storage battery in the storage battery pack; calculating a current weight of each battery according to the state of charge value of each battery; acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery; and controlling the storage battery pack to discharge according to the discharge current of each storage battery. The performance and the discharge capacity of each storage battery are reflected through the charge state value, the weight of the discharge current which is required to be provided by each storage battery is calculated through the real-time charge state value, the discharge current of each storage battery is obtained by integrating the weight and the discharge current of the storage battery pack, the discharge of the storage battery pack is managed according to each calculated storage battery, the effect of balanced discharge is achieved, and the stability of the storage battery pack is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for managing balanced discharge of a storage battery pack.
Background
In order to meet the demand of power supply capacity, a plurality of storage batteries are generally used by being combined into a storage battery pack in a parallel connection manner. In order to ensure the stable operating state of the storage battery pack, it is essential to apply a current sharing technique, which is used to uniformly distribute the output current of the system to each power module according to the power share of each power module.
The existing parallel current sharing technology mainly adopts a voltage and current feedback control mode to enable output characteristic curves of power modules to approximately coincide, so that the current of the power modules is uniformly distributed. The prior art does not take into account the capacity difference of each battery module. Due to the performance differences of the battery cells, the capacity of each battery in the battery pack may be different. In the discharging process of the storage battery pack, the storage battery with smaller capacity in the storage battery pack has faster voltage drop, and when the energy of the storage battery pack is discharged, the storage battery pack can be reversely charged by other storage batteries, so that the discharging capacity of the whole storage battery pack is weakened, and the aging of the storage battery is accelerated by over-discharge, so that the storage battery pack is scrapped in advance.
Disclosure of Invention
The embodiment of the invention provides a method for managing balanced discharge of a storage battery pack, which dynamically adjusts the magnitude of discharge current according to the charge state of each storage battery, achieves the effect of balanced discharge, and improves the stability of the storage battery pack.
An embodiment of the present invention provides a method for managing balanced discharge of a storage battery pack, where the method includes:
calculating the state of charge value of each storage battery in the storage battery pack;
calculating a current weight of each battery according to the state of charge value of each battery;
acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery;
and controlling the storage battery pack to discharge according to the discharge current of each storage battery.
Preferably, the calculating the state of charge value of each storage battery in the storage battery pack specifically includes:
acquiring discharge current information I of each storage batteryk(t) passing throughCalculating the residual capacity C of each storage battery by using a residual capacity calculation formular(k)；
Calculating the SOC value of each storage battery through a SOC value calculation formulak；
Wherein the residual capacity calculation formula is
The state of charge value calculation formula is SOCk＝Cr(k)/Cn(k)×100％；Cn(k)For the rated capacity, k, of each of said accumulators>0。
Preferably, the calculating the current weight of each storage battery according to the state of charge value of each storage battery specifically includes:
acquiring the state of charge value SOC of each storage batterykAnd calculating the current weight of each storage battery
Where K ∈ {1, 2, …, K }.
Preferably, before the obtaining a discharge current value of the battery pack and calculating a discharge current of each storage battery according to the discharge current value and the current weight of each storage battery, the method further includes:
and detecting the temperature of each storage battery, and correcting the current weight of each storage battery through the temperature.
Preferably, the detecting the temperature of each storage battery and correcting the current weight of each storage battery according to the temperature specifically include:
detecting the temperature T of each storage batterykAnd calculating the temperature coefficient eta of each storage batteryk＝1+ξ(Tk-T0)；
According to the temperature coefficient eta of each storage batterykCorrecting the current weight ω of each batterykObtaining the corrected current weight of each storage battery
Where xi is the temperature conversion coefficient, T0Is a reference temperature, k>0。
Preferably, the obtaining a discharge current value of the battery pack and calculating a discharge current of each storage battery according to the discharge current value and a current weight of each storage battery specifically include:
obtaining a discharge current value I of the storage battery pack and a corrected current weight omega of each storage battery'kThe discharging current I of each storage battery at the next momentk(t+1)＝I×ω′k。
The invention provides a method for managing the balanced discharge of a storage battery pack, which comprises the steps of calculating the charge state value of each storage battery in the storage battery pack; calculating a current weight of each battery according to the state of charge value of each battery; acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery; and controlling the storage battery pack to discharge according to the discharge current of each storage battery. The performance and the discharge capacity of each storage battery are reflected through the charge state value, the weight of the discharge current which is required to be provided by each storage battery is calculated through the real-time charge state value, the discharge current of each storage battery is obtained by integrating the weight and the discharge current of the storage battery pack, the discharge of the storage battery pack is managed according to each calculated storage battery, the effect of balanced discharge is achieved, and the stability of the storage battery pack is improved.
Drawings
Fig. 1 is a schematic flowchart of a method for managing equalizing discharge of a battery pack according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a method for managing balanced discharge of a storage battery pack, and referring to fig. 1, the method is a schematic flow diagram of the method for managing balanced discharge of the storage battery pack provided by the embodiment of the present invention, and includes steps S101 to S104:
s101, calculating a charge state value of each storage battery in the storage battery pack;
s102, calculating the current weight of each storage battery according to the charge state value of each storage battery;
s103, acquiring a discharge current value, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery;
and S104, controlling the storage battery pack to discharge according to the discharge current of each storage battery.
In the specific implementation of the present embodiment, the state-of-charge value of each battery in the battery pack is calculated, the current weight of each battery is calculated according to the state-of-charge value of each battery, the discharge current of each battery is calculated according to the current weight of each battery and the discharge current value of the battery pack, and the discharge management of the battery pack is realized according to the discharge current of each battery.
The embodiment of the invention provides a method for managing balanced discharge of a storage battery pack, which comprises the steps of calculating the charge state value of each storage battery in the storage battery pack; calculating a current weight of each battery according to the state of charge value of each battery; acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery; and controlling the storage battery pack to discharge according to the discharge current of each storage battery. The performance and the discharge capacity of each storage battery are reflected through the charge state value, the weight of the discharge current which is required to be provided by each storage battery is calculated through the real-time charge state value, the discharge current of each storage battery is obtained by integrating the weight and the discharge current of the storage battery pack, the discharge of the storage battery pack is managed according to each calculated storage battery, the effect of balanced discharge is achieved, and the stability of the storage battery pack is improved.
In another embodiment provided by the present invention, the step S101 specifically includes:
acquiring discharge current information I of each storage batteryk(t) calculating a remaining capacity C of each storage battery by a remaining capacity calculation formular(k)；
Calculating the SOC value of each storage battery through a SOC value calculation formulak；
Wherein the residual capacity calculation formula is
The state of charge value calculation formula is SOCk＝Cr(k)/Cn(k)×100％；Cn(k)For the rated capacity, k, of each of said accumulators>0。
In the embodiment, the discharge current information I for each storage batteryk(t) integrating to obtain the discharge capacity of each storage battery, and subtracting the discharge capacity from the rated capacity to obtain the residual capacity C of each storage batteryr(k)Calculating the SOC value of each storage battery through a SOC value calculation formulak；
The specific calculation process is as follows:
Cr(k)＝Cn(k)-∫0 tIk(t)dt
SOCk＝Cr(k)/Cn(k)×100％
wherein, Cn(k)For the rated capacity, k, of each of said accumulators>0, K represents one of the K batteries of the battery pack.
The residual capacity of each storage battery is calculated in real time by acquiring the discharge current, and the charge state is calculated according to the residual capacity of each storage battery, so that the charge state of each storage battery is accurately detected in real time.
In another embodiment provided by the present invention, the step S102 specifically includes:
acquiring the state of charge value SOC of each storage batterykAnd calculating the current weight of each storage battery
Where K ∈ {1, 2, …, K }.
In the specific implementation of the embodiment, the state of charge value SOC of each storage battery is obtainedkCalculating the weight of the state of charge value of each storage battery in the storage batteries to obtain the current weight
Where K ∈ {1, 2, …, K }.
And calculating the weight of the state of charge value of each storage battery in the state of charge values of all the storage batteries to obtain the current weight of each storage battery, thereby realizing the discharge balance of each storage battery.
In another embodiment of the present invention, before step S103, the method further includes:
and detecting the temperature of each storage battery, and correcting the current weight of each storage battery through the temperature.
In the embodiment, the current weight of each battery is corrected by detecting the temperature of each battery. The influence of external environment interference on the performance of the storage battery is avoided, and generally, the capacity of the storage battery is increased along with the rise of temperature, so the current weight of the storage battery is corrected by adopting the temperature, and more scientific discharge current distribution of the storage battery is realized.
In another embodiment of the present invention, the detecting the temperature of each battery and correcting the state of charge value of each battery according to the temperature specifically includes:
detecting the temperature T of each storage batterykAnd calculating the temperature coefficient eta of each storage batteryk＝1+ξ(Tk-T0)；
According to the temperature coefficient eta of each storage batterykCorrecting the current weight ω of each batterykObtaining the corrected current weight of each storage battery
Where xi is the temperature conversion coefficient, T0Is a reference temperature, k>0。
In the embodiment, the temperature coefficient eta is adoptedrModifying the current weight omega of each batteryk；
Firstly detecting the temperature T of each storage batterykAnd calculating the temperature coefficient eta of each storage batteryk＝1+ξ(Tk-T0)；
According to the temperature coefficient eta of each storage batterykCorrecting the current weight ω of each batterykObtaining the corrected current weight of each storage battery
Where xi is the temperature conversion coefficient, T0Is a reference temperature, k>0。
Since the capacity of the storage battery is affected by temperature, the current weight of each storage battery is corrected by detecting the temperature and calculating the temperature coefficient, and the discharge current distribution of each storage battery is more accurate.
It should be noted that, when calculating the current weight, the calculation using the corrected current weight of each storage battery is more objective than the calculation using the current weight of the storage battery obtained by direct calculation, and the distribution of the discharge current is performed, but the calculation using the current weight of each storage battery obtained by direct calculation can also achieve balanced management of discharge, and is also within the scope of the present invention.
In another embodiment provided by the present invention, step S103 specifically includes:
obtaining a discharge current value I of the storage battery pack and a corrected current weight omega of each storage battery'kEach at the next timeDischarge current I of each storage batteryk(t+1)＝I×ω′k。
In the specific implementation of the embodiment, the discharge current of each storage battery is calculated by obtaining the discharge current value of the storage battery pack and the corrected current weight of the discharge current of each storage battery, and the balanced discharge management of the storage battery pack is realized through the calculated discharge current of each storage battery.
The invention provides a method for managing the balanced discharge of a storage battery pack, which comprises the steps of calculating the charge state value of each storage battery in the storage battery pack; calculating a current weight of each battery according to the state of charge value of each battery; acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery; and controlling the storage battery pack to discharge according to the discharge current of each storage battery. The performance and the discharge capacity of each storage battery are reflected through the charge state value, the current weight is corrected through the temperature coefficient, the influence of external factors on the battery performance is eliminated, the obtained current weight is more accurate, the weight of the discharge current to be provided by each storage battery is calculated through the real-time charge state value, the discharge current of each storage battery is obtained by integrating the weight and the discharge current of the storage battery pack, the discharge of the storage battery pack is managed according to the calculated storage batteries, the effect of balanced discharge is achieved, and the stability of the storage battery pack is improved.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A method for managing equalized discharge of a battery pack, the method comprising:
calculating the state of charge value of each storage battery in the storage battery pack;
calculating a current weight of each battery according to the state of charge value of each battery;
acquiring a discharge current value of the storage battery pack, and calculating the discharge current of each storage battery according to the discharge current value and the current weight of each storage battery;
and controlling the storage battery pack to discharge according to the discharge current of each storage battery.
2. The method for managing balanced discharge of a storage battery pack according to claim 1, wherein the calculating the state of charge value of each storage battery in the storage battery pack specifically comprises:
acquiring discharge current information I of each storage batteryk(t) calculating a remaining capacity C of each storage battery by a remaining capacity calculation formular(k)；
Calculating the SOC value of each storage battery through a SOC value calculation formulak；
Wherein the residual capacity calculation formula is
The state of charge value calculation formula is SOCk＝Cr(k)/Cn(k)×100％；Cn(k)For the rated capacity, k, of each of said accumulators>0。
3. The method for managing balanced discharge of a battery pack according to claim 1, wherein the calculating the current weight of each battery according to the state-of-charge value of each battery specifically comprises:
acquiring the state of charge value SOC of each storage batterykAnd calculating the current weight of each storage battery
Where K ∈ {1, 2, …, K }.
4. The method for managing balanced discharge of a battery pack according to claim 1, wherein before the obtaining of the discharge current value of the battery pack, the calculating of the discharge current of each battery according to the discharge current value and the current weight of each battery, the method further comprises:
and detecting the temperature of each storage battery, and correcting the current weight of each storage battery through the temperature.
5. The method for managing equalized discharge of a battery pack according to claim 4, wherein the detecting a temperature of each battery and correcting the current weight of each battery according to the temperature specifically includes:
detecting the temperature T of each storage batterykAnd calculating the temperature coefficient eta of each storage batteryk＝1+ξ(Tk-T0)；
According to the temperature coefficient eta of each storage batterykCorrecting the current weight ω of each batterykObtaining the corrected current weight of each storage battery
Where xi is the temperature conversion coefficient, T0Is a reference temperature, k>0。
6. The method for managing balanced discharge of a battery pack according to claim 1, wherein the obtaining of the discharge current value of the battery pack and the calculating of the discharge current of each battery according to the discharge current value and the current weight of each battery comprise:
obtaining a discharge current value I of the storage battery pack and a corrected current weight omega of each storage battery'kThe discharging current I of each storage battery at the next momentk(t+1)＝I×ω′k。
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