CN113212207A - Single battery cell balancing method and device for charging pile - Google Patents
Single battery cell balancing method and device for charging pile Download PDFInfo
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- CN113212207A CN113212207A CN202110560303.9A CN202110560303A CN113212207A CN 113212207 A CN113212207 A CN 113212207A CN 202110560303 A CN202110560303 A CN 202110560303A CN 113212207 A CN113212207 A CN 113212207A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention provides a method and a device for balancing single battery cells of a charging pile, wherein when the condition that a battery pack of the charging pile enters a charging state and the acquired charging pile information meets a first preset condition is detected, the voltage of the single battery cell of each single battery cell of the charging pile is acquired; determining at least one target single battery cell from each single battery cell according to the single battery cell voltage of each single battery cell, and starting a balance mark of each target single battery cell; and when the reacquired charging pile information meets a second preset condition, closing the balance mark of each target single battery cell. Based on the method and the device, the single battery cells of the charging pile can be balanced.
Description
Technical Field
The invention relates to the technical field of single cell equalization of electric automobiles, in particular to a single cell equalization method and a single cell equalization device of a charging pile.
Background
Along with the rapid development of the society, the development of electric automobile is also faster and faster, and the development of corresponding electric pile is also faster and faster, and monomer electricity core is the important part of filling electric pile.
In the use that fills electric pile, can develop the maximum use potentiality of monomer electricity core through carrying out the equilibrium to monomer electricity core to better use fills electric pile. However, there is not an effective way to balance the individual cells of the charging pile.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for balancing individual battery cells of a charging pile, so as to achieve the purpose of balancing the individual battery cells of the charging pile.
The invention discloses a method for balancing single battery cells of a charging pile, which comprises the following steps:
when the fact that a battery pack of a charging pile enters a charging state and the acquired charging pile information meets a first preset condition is detected, acquiring the voltage of each single battery cell of each charging pile;
determining at least one target single battery cell from each single battery cell according to the single battery cell voltage of each single battery cell, and starting a balance mark of each target single battery cell;
and when the reacquired charging pile information meets a second preset condition, closing the balance mark of each target single battery cell.
Optionally, when detecting that the battery pack of the charging pile enters a charging state and the acquired charging pile information of the charging pile meets a first preset condition, acquiring the cell voltage of each cell of the charging pile, including:
when detecting that a battery pack of a charging pile enters a charging state, acquiring charging pile information, wherein the charging pile information at least comprises a charge state value of the battery pack, a battery pack current, time for starting a balance mark of a single battery cell for the last time, a temperature of a CMU (battery management unit), a highest single battery cell voltage and a lowest single battery cell voltage;
judging whether the charge state value of the battery pack is greater than a first preset charge state threshold, whether the current of the battery pack is less than a first preset battery pack current threshold, whether the temperature of the CMU (charge control unit) is less than a first preset temperature threshold, whether the difference value of the highest single cell voltage and the lowest single cell voltage is greater than a first preset voltage difference threshold, and whether the current time from the last time of starting the equalization mark of the single cell is greater than preset time;
if the state of charge value of the battery pack is larger than a first preset state of charge threshold, the current of the battery pack is smaller than a first preset battery pack current threshold, the temperature of a battery management unit CMU is smaller than a first preset temperature threshold, the difference value of the highest monomer cell voltage and the lowest monomer cell voltage is larger than a first preset voltage difference threshold, the current distance, the time for starting the balance mark of the monomer cell for the last time is larger than preset time, and each monomer cell of the charging pile has no cell fault, it is determined that the charging pile information meets a first preset condition, and the monomer cell voltage of each single cell is obtained.
Optionally, the determining a target individual battery cell from each individual battery cell according to the individual battery cell voltage of each individual battery cell includes:
calculating a first difference value between the single cell voltage of each single cell and the lowest single cell voltage in the single cell voltages of the single cells;
and determining the single battery cell corresponding to the first difference value smaller than a preset single battery cell voltage threshold value in each single battery cell as a target single battery cell.
Optionally, when the reacquired charging pile information meets a second preset condition, closing the balance flag of each target cell, including:
reacquiring charging pile information, wherein the reacquired charging pile information at least comprises a charge state value of the battery pack, a current of the battery pack, a temperature of a CMU (cell management unit), a highest cell voltage and a lowest cell voltage, and a current and a voltage of the charging pile;
determining the fault level of the charging pile according to the current and the voltage of the charging pile;
judging whether the state of charge value of the battery pack is smaller than a second preset state of charge threshold, whether the current of the battery pack is larger than a second preset battery pack current threshold, whether the temperature of the CMU (charge management unit) is larger than a second preset temperature threshold, whether the difference value of the highest monomer cell voltage and the lowest monomer cell voltage is smaller than a first preset voltage difference threshold, and whether the fault level of the charging pile is larger than a preset fault level;
if the state of charge value of the battery pack is smaller than a second preset state of charge threshold, or the current of the battery pack is larger than a second preset battery pack current threshold, or the temperature of the CMU is larger than a second preset temperature threshold, or the difference value between the highest monomer battery cell voltage and the lowest monomer battery cell voltage is smaller than a first preset voltage difference threshold, or the fault level of the charging pile is larger than a preset fault level, it is determined that the newly acquired charging pile information meets a second preset condition, and the balance mark of each target monomer battery cell is closed.
Optionally, the method further includes:
when the reacquired charging pile information does not meet a second preset condition, calculating the balance time corresponding to each target single battery cell according to the single battery cell voltage of each target single battery cell and the lowest single battery cell voltage in the single battery cell voltages of the single battery cells;
and closing the balance marks of the target single battery cells when the time for balancing in each target single battery cell reaches the corresponding balance time.
Optionally, the calculating, according to the cell voltage of each target cell and the lowest cell voltage of the cell voltages of the individual cells, the equalization time corresponding to each target cell includes:
for each target individual cell, calculating a second difference between the individual cell voltage of the target individual cell and the lowest individual cell voltage of the individual cell voltages of the individual cells;
and calculating the balance time corresponding to the target monomer battery cell according to the second difference value, the preset return difference voltage threshold value, the preset voltage threshold value, the second preset time threshold value and the preset balance current duty ratio.
The second aspect of the present invention discloses a device for balancing individual battery cells of a charging pile, wherein the device comprises:
the charging system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring the voltage of each single battery cell of the charging pile when the fact that a battery pack of the charging pile enters a charging state and the acquired charging pile information meets a first preset condition is detected;
the first determining unit is used for determining at least one target single battery cell from each single battery cell according to the single battery cell voltage of each single battery cell and starting a balance mark of each target single battery cell;
and the first closing unit is used for closing the balance mark of each target single battery cell when the reacquired charging pile information meets a second preset condition.
Optionally, the first obtaining unit includes:
the second acquisition unit is used for acquiring charging pile information when a battery pack of a charging pile is detected to enter a charging state, wherein the charging pile information at least comprises a charge state value of the battery pack, a battery pack current, the time for starting a balance mark of a single battery cell for the last time, the temperature of a CMU (battery management unit), the highest single battery cell voltage and the lowest single battery cell voltage;
the first judging unit is used for judging whether the charge state value of the battery pack is larger than a first preset charge state threshold, whether the current of the battery pack is smaller than a first preset battery pack current threshold, whether the temperature of the CMU (cell management unit) is smaller than a first preset temperature threshold, whether the difference value of the highest single cell voltage and the lowest single cell voltage is larger than a first preset voltage difference threshold, and whether the current time from the last time to start the balance mark of the single cell is larger than preset time;
and the second determining unit is used for determining that the charging pile information meets the first preset condition and acquiring the cell voltage of each cell if the charge state value of the cell pack is greater than a first preset charge state threshold, the current of the cell pack is less than a first preset cell pack current threshold, the temperature of the cell management unit CMU is less than a first preset temperature threshold, the difference value between the highest cell voltage and the lowest cell voltage is greater than a first preset voltage difference threshold, the current distance is greater than the time of starting the balance mark of the cell at the latest time than preset time, and each cell of the charging pile has no cell fault.
Optionally, the first determining unit includes:
a first calculation unit, configured to calculate a first difference between a cell voltage of each of the cell electric cores and a lowest cell voltage of the cell electric cores;
a third determining unit, configured to determine, as a target individual cell, the individual cell corresponding to the first difference value smaller than a preset individual cell voltage threshold in each individual cell.
Optionally, the first closing unit includes:
a third obtaining unit, configured to obtain charging pile information again, where the obtained charging pile information includes at least a charge state value of the battery pack, a battery pack current, a temperature of a CMU (cell management unit), a highest cell voltage, a lowest cell voltage, and a current and a voltage of the charging pile;
the fourth determining unit is used for determining the fault level of the charging pile according to the current and the voltage of the charging pile;
a second determining unit, configured to determine whether a state of charge value of the battery pack is smaller than a second preset state of charge threshold, whether a current of the battery pack is larger than a second preset battery pack current threshold, whether a temperature of a CMU of the battery management unit is larger than a second preset temperature threshold, whether a difference between the highest cell voltage and the lowest cell voltage is smaller than a first preset voltage difference threshold, and whether a fault level of the charging pile is larger than a preset fault level;
and the second closing unit is used for closing each balance mark of the target monomer electric core if the charge state value of the battery pack is smaller than a second preset charge state threshold value, or the current of the battery pack is larger than a second preset battery pack current threshold value, or the temperature of the CMU is larger than a second preset temperature threshold value, or the difference value between the highest monomer electric core voltage and the lowest monomer electric core voltage is smaller than a first preset voltage difference threshold value, or the fault level of the charging pile is larger than a preset fault level, determining that the newly acquired charging pile information meets a second preset condition, and closing each balance mark of the target monomer electric core.
The invention provides a method and a device for balancing single battery cells of a charging pile.A charging pile information of the charging pile is obtained by detecting a battery pack of the charging pile under the condition that the battery pack of the charging pile is detected to enter a charging state, and a single battery cell voltage of each single battery cell of the charging pile is obtained under the condition that the obtained charging pile information meets a first preset condition, so that at least one target single battery cell is determined from each single battery cell according to the single battery cell voltage of each single battery cell, and a balancing mark of each target single battery cell is opened; and when the reacquired charging pile information of the charging pile meets a second preset condition, closing the balance mark of each target single battery cell. According to the technical means provided by the invention, under the condition that the acquired charging pile information of the charging pile meets a first preset condition, a target single battery cell needing to be balanced is determined from each single battery cell according to the single battery cell voltage of each single battery cell, after the target single battery cell is determined, the balance of the single battery cells is realized by opening the balance mark of the target single battery cell, and when the acquired charging pile information of the charging pile meets a second preset condition, the balance mark of the target single battery cell is closed to stop the balance of the single battery cells.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for balancing individual battery cells of a charging pile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single battery cell balancing device of a charging pile 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.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1, a schematic flow chart of a method for balancing a single battery cell of a charging pile provided by an embodiment of the present invention is shown, where the method for balancing a single battery cell of a charging pile specifically includes the following steps:
s101: and when the battery pack of the charging pile is detected to enter a charging state, acquiring the information of the charging pile.
In the specific process of executing step S101, in the process of using the charging pile, when it is detected that the battery pack of the charging pile enters the charging state, the charging pile information of the charging pile is acquired. The acquired charging pile information at least includes a state of charge value of the battery pack, a current of the battery pack, a time for starting an equalization flag of the Cell at the last time, a temperature of a battery management unit (CMU), a highest Cell voltage, and a lowest Cell voltage.
S102: judging whether the acquired charging pile information meets a first preset condition or not; if the acquired charging pile information does not meet the first preset condition, returning to execute the step S101; and if the acquired charging pile information meets the first preset condition, executing the step S103.
In the specific process of executing step S102, after the charging pile information of the charging pile is obtained, it may be determined whether a charge state value of a battery pack in the charging pile information is greater than a first preset charge state threshold, whether a current of the battery pack is less than a first preset battery pack current threshold, whether a temperature of a battery management unit CMU is less than a first preset temperature threshold, whether a difference between a highest cell voltage and a lowest cell voltage is greater than a first preset voltage difference threshold, and whether a time for starting an equalization flag of a cell at the latest time from a current distance is greater than a preset time.
If the state of charge value of the battery pack is greater than a first preset state of charge threshold, the current of the battery pack is less than a first preset battery pack current threshold, the temperature of a battery management unit CMU is less than a first preset temperature threshold, the difference value of the highest monomer cell voltage and the lowest monomer cell voltage is greater than a first preset voltage difference threshold, the time of starting the balance mark of the monomer cell for the last time from the current distance is greater than preset time, each monomer cell of the charging pile has no cell fault, it is determined that the charging pile information of the charging pile meets a first preset condition, and under the condition that it is determined that the charging pile information of the charging pile meets the first preset condition, step S103 is executed.
If the state of charge value of the battery pack is not greater than the first preset state of charge threshold, or the current of the battery pack is not less than the first preset battery pack current threshold, or whether the temperature of the CMU is less than the first preset temperature threshold, or whether the difference between the highest cell voltage and the lowest cell voltage is not greater than the first preset voltage threshold, or whether the time from the current time to the last start of the equalization flag of the cell is greater than the preset time, it can be considered that the currently acquired charging pile information does not satisfy the first preset condition, the charging pile information of the charging pile is returned to the acquisition step S101, that is, the charging pile information is returned to the execution step S103 until the acquired charging pile information of the charging pile satisfies the first preset condition.
S103: and acquiring the voltage of each single battery cell of the charging pile.
In the specific execution process of step S103, after it is determined that the acquired charging pile information of the charging pile satisfies the first preset condition, the individual cell voltage of each individual cell of the charging pile is acquired, so that the individual cells that need to be balanced are determined according to the acquired individual cell voltage of each individual cell.
S104: and determining at least one target single battery cell from each single battery cell according to the single battery cell voltage of each single battery cell, and starting the balance mark of each target single battery cell.
In the specific execution process of step S104, after the individual cell voltages of each individual cell of the charging pile are obtained, the lowest individual cell voltage is determined from the individual cell voltages of the individual cells, and a difference between the individual cell voltage of each individual cell and the lowest individual cell voltage is calculated (for convenience of distinguishing, the difference between the individual cell voltage of each individual cell and the lowest individual cell voltage is referred to as a first difference).
Judging whether a first difference value smaller than a preset single cell voltage threshold exists in each first difference value, and if so, determining the single cell corresponding to the first difference value smaller than the preset single cell voltage threshold in each first difference value as a target single cell; and determining the cell number corresponding to each target cell, and further balancing the corresponding target cell by starting the corresponding balancing identifier corresponding to each cell number.
S105: judging whether the reacquired charging pile information meets a second preset condition; if the reacquired charging pile information meets a second preset condition, executing the step S106; and if the reacquired charging pile information does not meet the second preset condition, executing the step S107.
In the specific process of executing step S105, at least one target cell is determined from each cell, and a balancing flag corresponding to each target cell is turned on, so that after each target cell is balanced, charging pile information of the charging pile can be obtained again, where the obtained charging pile information at least includes a charge state value of a battery pack, a current of the battery pack, a temperature of a battery management unit CMU, a highest cell voltage, a lowest cell voltage, and a current and a voltage of the charging pile.
Determining the fault level of the charging pile according to the current and the voltage of the charging pile, and judging whether the charge state value of the battery pack is smaller than a second preset charge state threshold value, whether the current of the battery pack is larger than a second preset battery pack current threshold value, whether the temperature of a CMU (charge management unit) is larger than a second preset temperature threshold value, whether the difference value of the highest single cell core voltage and the lowest single cell core voltage is smaller than a first preset voltage difference threshold value, and whether the fault level of the charging pile is larger than a preset fault level.
If the state of charge value of the battery pack is smaller than a second preset state of charge threshold, or the current of the battery pack is larger than a second preset battery pack current threshold, or the temperature of the CMU is larger than a second preset temperature threshold, or the difference value between the highest monomer cell voltage and the lowest monomer cell voltage is smaller than a first preset voltage difference threshold, or the fault level of the charging pile is larger than a preset fault level, it is determined that the newly acquired charging pile information meets a second preset condition, and under the condition that it is determined that the newly acquired charging pile information meets the second preset condition, step S106 is executed.
If the state of charge value of the battery pack is not less than the second preset state of charge threshold, the current of the battery pack is greater than the second preset battery pack current threshold, the temperature of the CMU is not greater than the second preset temperature threshold, the difference value between the highest cell voltage and the lowest cell voltage is not less than the first preset voltage difference threshold, and the fault level of the charging pile is not greater than the preset fault level, it is determined that the newly acquired charging pile information satisfies the second preset condition, and under the condition that it is determined that the newly acquired charging pile information does not satisfy the second preset condition, step S107 can be executed.
As an optimal mode of this application, can be through the electric current of judging the stake of charging whether be greater than predetermineeing and fill electric pile current threshold value to and fill electric pile voltage whether be greater than predetermineeing and fill electric pile voltage threshold value and confirm and fill electric pile and whether break down, it is concrete, if fill electric pile's electric current and be greater than predetermineeing and fill electric pile current threshold value, and fill electric pile's voltage and also be greater than predetermineeing and fill electric pile voltage threshold value, can confirm that fills electric pile and break down, at this moment, can be greater than the degree of predetermineeing and filling electric pile current threshold value according to filling electric pile's electric current, and fill.
For example, the preset charging pile current threshold value is 400A, the preset charging pile voltage threshold value is 250V, and if the current of the charging pile obtained again is 410A and the voltage of the charging pile is 260V, the fault level of the charging pile can be considered to be level 1; if the current of the charging pile obtained again is 450A, the voltage of the charging pile is 280V, and the fault level of the charging pile can be considered to be level 2; the current of the charging pile obtained again is 410A, the voltage of the charging pile is 260V, and the fault level of the charging pile can be considered to be level 2; if the reacquired current of the charging pile is 510A, the voltage of the charging pile is 360V, and the fault level of the charging pile can be considered as 1 level, 3 levels and the like.
The above is only a preferred way of determining the fault level of the charging pile provided by the embodiment of the present application, and the specific way of determining the fault level of the charging pile may be set according to practical applications, which is not limited in the embodiment of the present application.
S106: the equalization flag of each target cell is turned off.
In the specific execution process of step S106, the balancing flag of each target individual battery cell is closed under the condition that the charging pile information of the charging pile acquired again after the balancing flag of each target individual battery cell is turned on meets a second preset condition, so that the balancing of each target individual battery cell is stopped.
S107: and calculating the corresponding equilibrium time of each target single battery cell according to the lowest single battery cell voltage in the single battery cell voltage of each target single battery cell and the single battery cell voltage of each single battery cell.
In the specific implementation process of step S107, when the charging pile information of the charging pile obtained again after the balancing flag of each target individual cell is turned on does not satisfy the second preset condition, for each target individual cell, a difference between the individual cell voltage of the target individual cell and the previously determined lowest individual cell voltage may be calculated (for convenience of distinguishing, the difference between the calculated individual cell voltage of the target individual cell and the previously determined lowest individual cell voltage is referred to as a second difference), a difference between the second difference and the preset back voltage threshold is calculated, a product of the preset voltage threshold and a second preset time threshold/preset balancing current duty ratio is calculated, and finally the difference between the second difference and the preset back voltage threshold is divided to calculate the product of the preset voltage threshold and the second preset time threshold/preset balancing current duty ratio, and obtaining the balance time of the target single battery cell.
S108: and closing the balance marks of the target single battery cells when the time for balancing in each target single battery cell reaches the corresponding balance time.
In the process of specifically executing step S108, after the balancing time of each target individual battery cell is calculated, for each target individual battery cell, after the balancing time corresponding to the time for performing balancing in the target individual battery cell, the balancing flag of the target individual battery cell is turned off, so that the target individual battery cell stops balancing.
The invention provides a single cell balancing method of a charging pile, which comprises the steps of detecting a battery pack of the charging pile by multiple detectors, acquiring charging pile information of the charging pile when the battery pack of the charging pile is detected to enter a charging state, and acquiring the voltage of a single cell of each single cell of the charging pile under the condition that the acquired charging pile information meets a first preset condition, so as to determine at least one target single cell from each single cell according to the voltage of the single cell of each single cell and open a balancing mark of each target single cell; and when the reacquired charging pile information of the charging pile meets a second preset condition, closing the balance mark of each target single battery cell. According to the technical means provided by the invention, under the condition that the acquired charging pile information of the charging pile meets a first preset condition, a target single battery cell needing to be balanced is determined from each single battery cell according to the single battery cell voltage of each single battery cell, after the target single battery cell is determined, the balance of the single battery cells is realized by opening the balance mark of the target single battery cell, and when the acquired charging pile information of the charging pile meets a second preset condition, the balance mark of the target single battery cell is closed to stop the balance of the single battery cells.
Based on the above method for balancing the individual battery cells of the charging pile provided by the embodiment of the present invention, correspondingly, an embodiment of the present invention further provides a device for balancing the individual battery cells of the charging pile, and referring to fig. 2, a schematic structural diagram of the device for balancing the individual battery cells of the charging pile provided by the embodiment of the present invention is shown, where the device for balancing the individual battery cells of the charging pile includes:
the first obtaining unit 21 is configured to obtain a cell voltage of each cell of the charging pile when it is detected that the battery pack of the charging pile enters a charging state and the obtained charging pile information meets a first preset condition;
a first determining unit 22, configured to determine at least one target individual battery cell from each individual battery cell according to an individual battery cell voltage of each individual battery cell, and turn on a balancing flag of each target individual battery cell;
and the first closing unit 23 is configured to close the balance flag of each target individual battery cell when the reacquired charging pile information meets a second preset condition.
The specific principle and the execution process of each unit in the single cell balancing device for the charging pile disclosed in the embodiment of the present invention are the same as those of the single cell balancing method for the charging pile disclosed in the embodiment of the present invention, and reference may be made to corresponding parts in the single cell balancing method for the charging pile disclosed in the embodiment of the present invention, which are not described herein again.
The invention provides a single cell balancing device of a charging pile, which is characterized in that charging pile information of the charging pile is obtained by detecting a battery pack of the charging pile under the condition that the battery pack of the charging pile is detected to enter a charging state, and the single cell voltage of each single cell of the charging pile is obtained under the condition that the obtained charging pile information meets a first preset condition, so that at least one target single cell is determined from each single cell according to the single cell voltage of each single cell, and a balancing mark of each target single cell is opened; and when the reacquired charging pile information of the charging pile meets a second preset condition, closing the balance mark of each target single battery cell. According to the technical means provided by the invention, under the condition that the acquired charging pile information of the charging pile meets a first preset condition, a target single battery cell needing to be balanced is determined from each single battery cell according to the single battery cell voltage of each single battery cell, after the target single battery cell is determined, the balance of the single battery cells is realized by opening the balance mark of the target single battery cell, and when the acquired charging pile information of the charging pile meets a second preset condition, the balance mark of the target single battery cell is closed to stop the balance of the single battery cells.
Optionally, the first obtaining unit includes:
the second acquisition unit is used for acquiring charging pile information when the charging pile package of the charging pile is detected to enter a charging state, wherein the charging pile information at least comprises a charge state value of the battery package, a current of the battery package, the time for starting the balance mark of the single battery cell for the last time, the temperature of a CMU (cell management unit), the highest single battery cell voltage and the lowest single battery cell voltage;
the first judgment unit is used for judging whether the charge state value of the battery pack is greater than a first preset charge state threshold, whether the current of the battery pack is less than a first preset battery pack current threshold, whether the temperature of a battery management unit CMU is less than a first preset temperature threshold, whether the difference value of the highest single cell voltage and the lowest single cell voltage is greater than a first preset voltage difference threshold, and whether the current time from the latest starting of the balance mark of the single cell is greater than preset time;
and the second determining unit is used for determining that the charging pile information meets the first preset condition and acquiring the cell voltage of each single cell if the charge state value of the cell pack is greater than a first preset charge state threshold, the current of the cell pack is less than a first preset cell pack current threshold, the temperature of the cell management unit CMU is less than a first preset temperature threshold, the difference value of the highest cell voltage and the lowest cell voltage is greater than a first preset voltage difference threshold, and the time of starting the balance mark of the cell at the latest distance is greater than preset time.
Optionally, the first determining unit includes:
the first calculation unit is used for calculating a first difference value between the single cell voltage of each single cell and the lowest single cell voltage in the single cell voltages of the single cells;
and the third determining unit is used for determining the single battery cell corresponding to the first difference value smaller than the preset single battery cell voltage threshold value in each single battery cell as the target single battery cell.
Optionally, the first closing unit includes:
the third acquiring unit is used for acquiring charging pile information again, wherein the acquired charging pile information at least comprises a charge state value of a battery pack, a current of the battery pack, a temperature of a CMU (cell management unit), a highest single cell voltage and a lowest single cell voltage, and a current and a voltage of a charging pile;
the fourth determining unit is used for determining the fault level of the charging pile according to the current and the voltage of the charging pile;
the second judging unit is used for judging whether the charge state value of the battery pack is smaller than a second preset charge state threshold, whether the current of the battery pack is larger than a second preset battery pack current threshold, whether the temperature of a CMU (charge management unit) is larger than a second preset temperature threshold, whether the difference value of the highest single cell voltage and the lowest single cell voltage is smaller than a first preset voltage difference threshold, and whether the fault level of the charging pile is larger than a preset fault level;
and the second closing unit is used for closing the balance mark of each target monomer electric core if the charge state value of the battery pack is smaller than a second preset charge state threshold value, or the current of the battery pack is larger than a second preset battery pack current threshold value, or the temperature of the battery management unit CMU is larger than a second preset temperature threshold value, or the difference value of the highest monomer electric core voltage and the lowest monomer electric core voltage is smaller than a first preset voltage difference threshold value, or the fault level of the charging pile is larger than a preset fault level, and determining that the newly acquired charging pile information meets a second preset condition.
Further, the present invention provides a cell balancing apparatus for a charging pile, further comprising:
the second calculation unit is used for calculating the balance time corresponding to each target single battery cell according to the single battery cell voltage of each target single battery cell and the lowest single battery cell voltage in the single battery cell voltages of the single battery cells when the reacquired charging pile information does not meet a second preset condition;
and the third closing unit is used for closing the balance marks of the target single battery cells, of which the time for balancing reaches the corresponding balance time, in each target single battery cell.
Optionally, the second computing unit includes:
a third calculation unit, configured to calculate, for each target individual battery cell, a second difference between an individual battery cell voltage of the target individual battery cell and a lowest individual battery cell voltage of the individual battery cell voltages of the individual battery cells;
and the fourth calculating unit is used for calculating the balance time corresponding to the target single battery cell according to the second difference value, the preset return difference voltage threshold value, the preset voltage threshold value, the second preset time threshold value and the preset balance current duty ratio.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein 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 a plurality of 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. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
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Denomination of invention: A method and device for balancing individual battery cells of a charging station Granted publication date: 20220628 Pledgee: Zhejiang Qiongjin Technology Co.,Ltd. Pledgor: JIANGSU DUPU NEW ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2025980011904 |