CN113212207B - Single cell balancing method and device for charging pile - Google Patents

Abstract

The present invention provides a method and device for balancing a single cell of a charging pile. When it is detected that the battery pack of the charging pile is in a charging state, and the acquired charging pile information satisfies a first preset condition, each cell of the charging pile is acquired. The single cell voltage of the bulk cell; according to the single cell voltage of each single cell, at least one target single cell is determined from each single cell, and the balance of each target single cell is turned on flag; when the re-acquired charging pile information satisfies the second preset condition, the equalization flag of each target single cell is turned off. Based on the present invention, it is possible to balance the single cells of the charging pile.

Description

A method and device for balancing a single cell of a charging pile

technical field

The invention relates to the technical field of single cell balance of electric vehicles, and more particularly, to a method and device for single cell balance of a charging pile.

Background technique

With the rapid development of society, the development of electric vehicles is also getting faster and faster, and the development of corresponding charging piles is also getting faster and faster, and the single cell is an important part of the charging pile.

In the process of using the charging pile, the maximum use potential of the single cell can be developed by balancing the single cell, so as to better use the charging pile. However, there is currently no effective way to balance the single cells of the charging pile.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a method and device for balancing a single cell of a charging pile for the purpose of balancing the single cell of a charging pile.

A first aspect of the present invention discloses a method for balancing a single cell of a charging pile, the method comprising:

When it is detected that the battery pack of the charging pile enters the charging state, and the acquired charging pile information satisfies the first preset condition, acquiring the single cell voltage of each single cell of the charging pile;

According to the single cell voltage of each of the single cells, at least one target single cell is determined from each of the single cells, and the equalization flag of each of the target single cells is turned on;

When the re-acquired charging pile information satisfies the second preset condition, the equalization flag of each target single cell is turned off.

Optionally, when it is detected that the battery pack of the charging pile enters the charging state, and the obtained charging pile information of the electric pile meets the first preset condition, the single cell of each single cell of the charging pile is obtained. Cell voltage, including:

When it is detected that the battery pack of the charging pile enters the charging state, the information of the charging pile is obtained, wherein the charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, and the last time the single cell was turned on. The time of the equalization mark, the temperature of the battery management unit CMU, the highest cell voltage and the lowest cell voltage;

Determine whether the state-of-charge value of the battery pack is greater than a first preset state-of-charge threshold, whether the battery pack current is less than a first preset battery pack current threshold, and whether the temperature of the battery management unit CMU is less than a first preset temperature Threshold, whether the difference between the highest single cell voltage and the lowest single cell voltage is greater than the first preset voltage difference threshold, and whether the current time from the last time the balance flag of the single cell is turned on greater than the preset time;

If the state-of-charge value of the battery pack is greater than the first preset state-of-charge threshold, the current of the battery pack is less than the first preset battery pack current threshold, the temperature of the battery management unit CMU is less than the first preset temperature threshold, the The difference between the highest single cell voltage and the lowest single cell voltage is greater than a first preset voltage difference threshold, the current time from the last time the balance flag of the single cell is turned on is greater than a preset time, and Each single cell of the charging pile has no cell failure, it is determined that the information of the charging pile satisfies the first preset condition, and the single cell voltage of each single cell is obtained.

Optionally, the determining a target single cell from each of the single cells according to the single cell voltage of each of the single cells includes:

calculating the first difference between the single cell voltage of each single cell and the lowest single cell voltage among the single cell voltages of each single cell;

The single cell corresponding to the first difference that is smaller than the preset single cell voltage threshold in each of the single cells is determined as a target single cell.

Optionally, when the re-acquired charging pile information satisfies the second preset condition, turning off the equalization flag of each target single cell, including:

Re-acquire charging pile information, wherein the re-acquired charging pile information at least includes the state of charge value of the battery pack, the battery pack current, the temperature of the battery management unit CMU, the highest cell voltage and the lowest cell cell voltage voltage, and the current and voltage of the charging pile;

Determine the fault level of the charging pile according to the current and voltage of the charging pile;

Determine whether the state-of-charge value of the battery pack is less than a second preset state-of-charge threshold, whether the battery pack current is greater than a second preset battery pack current threshold, and whether the temperature of the battery management unit CMU is greater than a second preset temperature threshold, whether the difference between the highest single cell voltage and the lowest single cell voltage is less than a first preset voltage difference threshold, and whether the failure level of the charging pile is greater than a preset failure level;

If the state-of-charge value of the battery pack is less than a second preset state-of-charge threshold, or the battery pack current is greater than a second preset battery pack current threshold, or the temperature of the battery management unit CMU is greater than a second preset threshold Temperature threshold, or, the difference between the highest single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, or, the failure level of the charging pile is greater than the preset failure level, determine The re-acquired charging pile information satisfies the second preset condition, and the equalization flag of each target single cell is turned off.

Optionally, the method further includes:

When the re-acquired charging pile information does not meet the second preset condition, according to the single cell voltage of each target single cell and the single cell voltage of each single cell, the lowest cell voltage Cell voltage, calculate the equalization time corresponding to each target single cell;

Turning off the equalization flag of the target single cell whose equalization time reaches the corresponding equalization time in each of the target single cell.

Optionally, according to the single cell voltage of each target single cell and the lowest single cell voltage among the single cell voltages of each of the single cell cells, calculate each target cell Equilibrium time corresponding to a single cell, including:

For each of the target single cells, calculate the first cell voltage of the target single cell and the lowest single cell voltage among the single cell voltages of the target single cells and the single cell voltages of the respective single cells. two difference;

According to the second difference, the preset hysteresis voltage threshold, the preset voltage threshold, the second preset time threshold and the preset equalization current duty ratio, the equalization time corresponding to the target single cell is calculated.

A second aspect of the present invention discloses a single cell balancing device for a charging pile, the device comprising:

a first acquisition unit, configured to acquire the single cell of each single cell of the charging pile when it is detected that the battery pack of the charging pile enters the charging state and the acquired charging pile information satisfies the first preset condition Voltage;

The first determining unit is configured to determine at least one target single cell from each of the single cells according to the single cell voltage of each of the single cells, and turn on each of the target single cells The balance mark of the core;

The first closing unit is configured to close the equalization flag of each target single cell when the re-acquired charging pile information satisfies the second preset condition.

Optionally, the first obtaining unit includes:

The second acquisition unit is configured to acquire charging pile information when it is detected that the battery pack of the charging pile enters the charging state, wherein the charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, the last time it was turned on The time of the balance mark of the single cell, the temperature of the battery management unit CMU, the highest single cell voltage and the lowest single cell voltage;

a first judgment unit, configured to judge whether the state of charge value of the battery pack is greater than a first preset state of charge threshold, whether the current of the battery pack is less than a first preset battery pack current threshold, and the temperature of the battery management unit CMU Whether it is less than the first preset temperature threshold, whether the difference between the highest single cell voltage and the lowest single cell voltage is greater than the first preset voltage difference threshold, and whether the current distance from the last time the single cell is turned on Whether the time of the balance mark of the core is greater than the preset time;

a second determining unit, configured to, 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 the first preset battery pack current threshold, and the temperature of the battery management unit CMU is less than the first threshold a preset temperature threshold, the difference between the highest single cell voltage and the lowest single cell voltage is greater than the first preset voltage difference threshold, and the current distance from the balance mark of the last time the single cell is turned on When the time is greater than the preset time, and each single cell of the charging pile has no cell failure, it is determined that the information of the charging pile meets the first preset condition, and the single cell of each single cell is obtained. Cell voltage.

Optionally, the first determining unit includes:

a first calculation unit, configured to calculate the first difference between the single cell voltage of each of the single cells and the voltage of the lowest single cell among the single cell voltages of each of the single cells;

The third determining unit is configured to determine the single cell corresponding to the first difference that is smaller than the preset single cell voltage threshold in each of the single cell as the target single cell.

Optionally, the first closing unit includes:

The third acquisition unit is configured to re-acquire charging pile information, wherein the re-acquired charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, the temperature of the battery management unit CMU, the highest single cell voltage and the lowest single cell voltage, and the current and voltage of the charging pile;

a fourth determining unit, configured to determine the fault level of the charging pile according to the current and voltage of the charging pile;

a second determination unit, configured to determine whether the state-of-charge value of the battery pack is less than a second preset state-of-charge threshold, whether the current of the battery pack is greater than a second preset battery pack current threshold, and the temperature of the battery management unit CMU Whether it is greater than the second preset temperature threshold, whether the difference between the highest single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, and whether the failure level of the charging pile is greater than the preset voltage. set failure level;

The second shutdown unit is configured to, if the state-of-charge value of the battery pack is smaller than a second preset state-of-charge threshold, or the battery pack current is greater than the second preset battery pack current threshold, or the battery management unit CMU The temperature is greater than the second preset temperature threshold, or the difference between the highest single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, or the failure level of the charging pile If it is greater than the preset failure level, it is determined that the re-acquired information of the charging pile satisfies the second preset condition, and the equalization flag of each target single cell is turned off.

The invention provides a method and device for balancing a single cell of a charging pile. By detecting the battery pack of 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, and the charging pile information is obtained in the charging pile. In the case where the acquired charging pile information satisfies the first preset condition, the single cell voltage of each single cell of the charging pile is obtained, so as to obtain the information from each cell according to the single cell voltage of each single cell. At least one target single cell is determined in the single cell, and the equalization flag of each target single cell is turned on; when the re-acquired charging pile information of the charging pile meets the second preset condition, each target cell is turned off Balanced symbol for cells. According to the technical means provided by the present invention, in the case that the acquired charging pile information of the charging pile satisfies the first preset condition, the needs are determined from each single cell according to the single cell voltage of each single cell. For the target single cell to be balanced, after the target single cell is determined, the balance of the single cell is realized by turning on the balance flag of the target single cell, and the re-acquired charging pile information of the charging pile meets the requirements. In the second preset condition, the equalization flag of the target single cell is turned off to stop the equalization of the single cell.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic flowchart of a method for balancing a single cell of a charging pile according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a single cell balancing device of a charging pile according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In this application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also no Other elements expressly listed, or which are also inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Referring to FIG. 1 , a schematic flowchart of a method for balancing a single cell of a charging pile provided by an embodiment of the present invention is shown. The method for balancing a single cell of a charging pile specifically includes the following steps:

S101: When it is detected that the battery pack of the charging pile enters the charging state, obtain the information of the charging pile.

In the process of specifically 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. Among them, the obtained charging pile information includes at least the state of charge value of the battery pack, the current of the battery pack, the last time the balance flag of the single cell was turned on, the temperature of the battery management unit (Cell Management Unit, CMU), the highest single battery power core voltage and minimum single cell voltage.

S102: Determine whether the acquired charging pile information satisfies the first preset condition; if the acquired charging pile information does not satisfy the first preset condition, return to step S101; if the acquired charging pile information satisfies the first preset condition, execute step S102 S103.

During the specific execution of step S102, after obtaining the charging pile information of the charging pile, it can be determined whether the state of charge value of the battery pack in the information of the charging pile is greater than the first preset state of charge threshold, and whether the current of the battery pack is less than the first The preset battery pack current threshold, whether the temperature of the battery management unit CMU is less than the first preset temperature threshold, whether the difference between the highest cell voltage and the lowest cell voltage is greater than the first preset voltage difference threshold, and the current distance Whether the last time the balance flag of the single cell was turned on is greater than the preset time.

If the state-of-charge value of the battery pack is greater than the first preset state-of-charge threshold, the current of the battery pack is less than the first preset battery pack current threshold, the temperature of the battery management unit CMU is less than the first preset temperature threshold, the highest single cell voltage and The difference of the lowest single cell voltage is greater than the first preset voltage difference threshold, the current time from the last time the balance flag of the single cell is turned on is greater than the preset time, and each single cell of the charging pile has no power If the core is faulty, it is determined that the charging pile information of the charging pile satisfies the first preset condition, and if it is determined that the charging pile information of the charging pile satisfies the first preset condition, step S103 is performed.

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 the temperature of the battery management unit CMU is not less than the first preset temperature threshold, Or, the difference between the highest single cell voltage and the lowest single cell voltage is not greater than the first preset voltage difference threshold, or the current time from the last time the balance flag of the single cell is turned on is not greater than the preset time, It can be considered that the currently acquired charging pile information does not meet the first preset condition, then return to obtain the charging pile information of the charging pile, that is, return to step S101 until the acquired charging pile information of the charging pile satisfies the first preset condition , and step S103 is executed.

S103: Obtain the single cell voltage of each single cell of the charging pile.

In the process of specifically executing step S103, after it is determined that the acquired charging pile information of the charging pile satisfies the first preset condition, the single cell voltage of each single cell of the charging pile is acquired, so that according to the acquired charging pile information of each single cell The single cell voltage of each single cell determines the single cell that needs to be balanced.

S104: Determine at least one target single cell from each single cell according to the single cell voltage of each single cell, and turn on the equalization flag of each target single cell.

During the specific execution of step S104, after obtaining the single cell voltage of each single cell of the charging pile, the lowest single cell voltage is determined from the single cell voltage of each single cell, And calculate the difference between the single cell voltage of each single cell and the lowest single cell voltage (for ease of distinction, the difference between the single cell voltage of each single cell and the lowest single cell voltage is calculated. The difference is called the first difference).

Determine whether there is a first difference that is less than the preset single cell voltage threshold in each of the first differences, and if there is, assign the first difference corresponding to the first difference that is less than the preset single cell voltage threshold in each of the first differences The single cell is determined as the target single cell; the cell number corresponding to each target single cell is determined, and then the corresponding target single cell corresponding to each cell number can be turned on. The body cells are balanced.

S105: Determine whether the re-acquired charging pile information satisfies the second preset condition; if the re-acquired charging pile information satisfies the second preset condition, perform step S106; if the re-acquired charging pile information does not meet the second preset condition, Step S107 is performed.

During the specific execution of step S105, at least one target single cell is determined from each single cell, and the equalization flag corresponding to each target single cell is turned on, so that after each target single cell is balanced, The charging pile information of the charging pile can be re-acquired, wherein the re-acquired charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, the temperature of the battery management unit CMU, the highest cell voltage and the lowest cell cell. voltage, and the current and voltage of the charging pile.

Determine the fault level of the charging pile according to the current and voltage of the charging pile, determine whether the state of charge value of the battery pack is less than the second preset state of charge threshold, whether the current of the battery pack is greater than the second preset battery pack current threshold, and whether the battery management unit CMU Whether the temperature is greater than the second preset temperature threshold, whether the difference between the highest single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, and whether the fault level of the charging pile is greater than the preset fault level.

If the state-of-charge value of the battery pack is less than the second preset state-of-charge threshold, or the battery pack current is greater than the second preset battery pack current threshold, or the temperature of the battery management unit CMU is greater than the second preset temperature threshold, or the highest The difference between the single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, or the fault level of the charging pile is greater than the preset fault level, and it is determined that the re-acquired charging pile information satisfies the second preset condition , in the case that it is determined that the re-acquired charging pile information satisfies the second preset condition, step S106 is performed.

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 not greater than the second preset battery pack current threshold, the temperature of the battery management unit CMU is not greater than the second preset temperature threshold, and the highest cell power The difference between the core voltage and the lowest single 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, and it is determined that the re-acquired charging pile information does not meet the second preset condition, If it is determined that the re-acquired charging pile information does not meet the second preset condition, step S107 may be performed.

As a preferred method of the present application, it can be determined whether the charging pile is faulty by judging whether the current of the charging pile is greater than the preset charging pile current threshold, and whether the voltage of the charging pile is greater than the preset charging pile voltage threshold. If the current of the charging pile is greater than the preset charging pile current threshold, and the voltage of the charging pile is also greater than the preset charging pile voltage threshold, it can be determined that the charging pile is faulty. level, and the failure level of the charging pile is determined according to the degree to which the voltage of the charging pile is greater than the preset charging pile voltage threshold.

For example, the preset charging pile current threshold is 400A, and the preset charging pile voltage threshold is 250V. If the re-acquired current of the charging pile is 410A and the voltage of the charging pile is 260V, it can be considered that the fault level of the charging pile is level 1; The current of the reacquired charging pile is 450A, and the voltage of the charging pile is 280V, so it can be considered that the fault level of the charging pile is level 2; if the current of the reacquired charging pile is 510A, and the voltage of the charging pile is 360V, it can be considered that the charging pile The failure level is 3 and so on.

The above is only a preferred method for determining the fault level of the charging pile provided by the embodiment of the present application. The specific method for determining the fault level of the charging pile can be set according to the actual application, which is not limited in the embodiment of the present application.

S106: Turn off the equalization flag of each target single cell.

In the process of specifically executing step S106, in the case that the charging pile information of the charging pile obtained again after the equalization flag of each target single cell is turned on satisfies the second preset condition, the charging pile information of each target single cell is turned off. Equalization flag to stop the equalization of each target single cell.

S107: Calculate the equalization time corresponding to each target single cell according to the single cell voltage of each target single cell and the lowest single cell voltage among the single cell voltages of each single cell.

During the specific execution of step S107, in the case that the charging pile information of the charging pile obtained again after the equalization flag of each target single cell is turned on does not meet the second preset condition, for each target single cell In other words, the difference between the single cell voltage of the target single cell and the previously determined minimum single cell voltage can be calculated (for the convenience of distinction, the calculated single cell voltage of the target single cell is The difference between the lowest single cell voltage determined before is called the second difference), and the difference between the second difference and the preset hysteresis voltage threshold is calculated, and the preset voltage threshold and the second preset time threshold / The product of the preset equalization current duty cycle, and finally the difference between the second difference and the preset hysteresis voltage threshold is divided by the calculated product of the preset voltage threshold and the second preset time threshold/preset equalization current duty cycle, The equilibration time of the target single cell is obtained.

S108: Turn off the equalization flag of each target single cell whose time for equalization reaches the corresponding equalization time in each target single cell.

In the process of specifically executing step S108, after calculating the equalization time of each target single cell, for each target single cell, when the equalization time in the target single cell corresponds to the equalization time After the time has elapsed, the equalization flag of the target single cell is turned off to stop the equalization of the target single cell.

The invention provides a method for balancing a single cell of a charging pile. The battery packs of the charging piles are mostly detected. When it is detected that the battery packs of the charging piles are in the charging state, the charging pile information of the charging piles is acquired, and the charging pile information of the charging piles is obtained in all the charging piles. In the case where the acquired charging pile information satisfies the first preset condition, the single cell voltage of each single cell of the charging pile is obtained, so as to obtain information from each single cell according to the single cell voltage of each single cell. At least one target single cell is determined in the body cells, and the equalization flag of each target single cell is turned on; when the re-acquired charging pile information of the charging pile meets the second preset condition, each target single cell is turned off. Equalization logo of the core. According to the technical means provided by the present invention, in the case that the acquired charging pile information of the charging pile satisfies the first preset condition, the needs are determined from each single cell according to the single cell voltage of each single cell. For the target single cell to be balanced, after the target single cell is determined, the balance of the single cell is realized by turning on the balance flag of the target single cell, and the re-acquired charging pile information of the charging pile meets the requirements. In the second preset condition, the equalization flag of the target single cell is turned off to stop the equalization of the single cell.

Based on the method for balancing a single cell of a charging pile provided by the above embodiments of the present invention, correspondingly, an embodiment of the present invention also provides a device for balancing a single cell of a charging pile. Referring to FIG. 2 , the present invention is shown The embodiment provides a schematic structural diagram of a single cell balancing device of a charging pile, and the single cell balancing device of the charging pile includes:

The first obtaining unit 21 is configured to obtain the single cell voltage of each single cell of the charging pile when it is detected that the battery pack of the charging pile enters the charging state and the obtained charging pile information satisfies the first preset condition ;

The first determining unit 22 is configured to determine at least one target single cell from each single cell according to the single cell voltage of each single cell, and turn on the equalization flag of each target single cell;

The first closing unit 23 is configured to close the equalization flag of each target single cell when the re-acquired charging pile information satisfies the second preset condition.

The specific principle and implementation process of each unit in the single cell balancing device of the charging pile disclosed in the above embodiment of the present invention are the same as the single cell balancing method of the charging pile disclosed in the above embodiment of the present invention. Corresponding parts in the method for balancing a single cell of a charging pile disclosed in the embodiment will not be repeated here.

The invention provides a single cell balancing device for a charging pile. By detecting the battery pack of 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, and the obtained charging pile information is obtained. When the information of the charging pile satisfies the first preset condition, the single cell voltage of each single cell of the charging pile is obtained, so that according to the single cell voltage of each single cell, from each cell Determine at least one target single cell in the cells, and turn on the equalization flag of each target single cell; when the re-acquired charging pile information of the charging pile satisfies the second preset condition, turn off each target single cell balance sign. According to the technical means provided by the present invention, in the case that the acquired charging pile information of the charging pile satisfies the first preset condition, the needs are determined from each single cell according to the single cell voltage of each single cell. For the target single cell to be balanced, after the target single cell is determined, the balance of the single cell is realized by turning on the balance flag of the target single cell, and the re-acquired charging pile information of the charging pile meets the requirements. In the second preset condition, the equalization flag of the target single cell is turned off to stop the equalization of the single cell.

Optionally, the first acquisition unit includes:

The second acquiring unit is configured to acquire charging pile information when it is detected that the battery pack of the charging pile enters the charging state, wherein the charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, and the last time the single cell was turned on. The time of the equalization mark, the temperature of the battery management unit CMU, the highest cell voltage and the lowest cell voltage;

A first judgment unit, configured to judge whether the state-of-charge value of the battery pack is greater than a first preset state-of-charge threshold, whether the battery pack current is less than the first preset battery pack current threshold, and whether the temperature of the battery management unit CMU is less than the first preset threshold Whether the temperature threshold, the difference between the highest single cell voltage and the lowest single cell voltage is greater than the first preset voltage difference threshold, and whether the current time since the last time the balance flag of the single cell was turned on is greater than the preset time;

The second determining unit is configured to, if the state-of-charge value of the battery pack is greater than the first preset state-of-charge threshold, the current of the battery pack is less than the first preset battery pack current threshold, and the temperature of the battery management unit CMU is less than the first preset temperature threshold, The difference between the highest single cell voltage and the lowest single cell voltage is greater than the first preset voltage difference threshold and the current time from the last time to turn on the balance flag of the single cell is greater than the preset time, and each charging pile If there is no cell failure in any single cell, it is determined that the charging pile information satisfies the first preset condition, and the single cell voltage of each single cell is obtained.

Optionally, the first determining unit includes:

a first calculation unit for calculating the first difference between the single cell voltage of each single cell and the single cell voltage of each single cell and the lowest single cell voltage;

The third determining unit is configured to determine the single cell corresponding to the first difference smaller than the preset single cell voltage threshold value among the single cell cells as the target single cell cell.

Optionally, the first closing unit, including:

The third acquisition unit is used to re-acquire the charging pile information, wherein the re-acquired charging pile information at least includes the state of charge value of the battery pack, the current of the battery pack, the temperature of the battery management unit CMU, the highest cell voltage and the lowest cell voltage Body cell voltage, as well as the current and voltage of the charging pile;

a fourth determining unit, used for determining the fault level of the charging pile according to the current and voltage of the charging pile;

A second determination unit, configured to determine whether the state-of-charge value of the battery pack is less than a second preset state-of-charge threshold, whether the current of the battery pack is greater than the second preset battery pack current threshold, and whether the temperature of the battery management unit CMU is greater than the second preset threshold Whether the temperature threshold, the difference between the highest single cell voltage and the lowest single cell voltage is less than the first preset voltage difference threshold, and whether the fault level of the charging pile is greater than the preset fault level;

The second shutdown unit is used for if the state-of-charge value of the battery pack is less than the second preset state-of-charge threshold, or the current of the battery pack is greater than the second preset battery pack current threshold, or the temperature of the battery management unit CMU is greater than the second preset threshold Set the temperature threshold, or, the difference between the highest single cell voltage and the lowest single cell voltage is smaller than the first preset voltage difference threshold, or, the fault level of the charging pile is greater than the preset fault level, and the re-acquired charging pile is determined. If the information satisfies the second preset condition, the equalization flag of each target single cell is turned off.

Further, the present invention provides a single cell balancing device for a charging pile, further comprising:

The second calculation unit is used to calculate the value of the single cell voltage of each target single cell according to the single cell voltage of each target single cell and the single cell voltage of each single cell when the re-acquired charging pile information does not meet the second preset condition. The lowest single cell voltage, calculate the equalization time corresponding to each target single cell;

The third closing unit is configured to close the equalization flag of the target single cell whose time for equalization reaches the corresponding equalization time in each target single cell.

Optionally, the second computing unit, including:

The third calculation unit is configured to, for each target single cell, calculate the difference between the single cell voltage of the target single cell and the lowest single cell voltage among the single cell voltages of each single cell second difference;

The fourth calculation unit is configured to calculate the equalization time corresponding to the target single cell according to the second difference, the preset hysteresis voltage threshold, the preset voltage threshold, the second preset time threshold and the preset equalization current duty cycle .

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for related parts. The systems and system embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, It can be located in one place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

The above description of the disclosed embodiments enables 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 implemented in 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 above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. A single cell balancing method of a charging pile is characterized by comprising 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 the 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;

when the reacquired charging pile information meets a second preset condition, closing the balance mark of each target monomer battery cell;

wherein, when detecting that the battery package that fills electric pile gets into the charged state, and the electric pile information of acquireing when satisfying first predetermined condition, acquire the monomer electric core voltage of every monomer electric core that fills electric pile, include:

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, the time for starting an equalization flag of a single battery cell last time, the temperature of a CMU (battery management unit), the highest single battery cell voltage and the 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 a CMU (charge management unit) is less than a first preset temperature threshold, whether the difference value of the highest cell core voltage and the lowest cell core voltage is greater than a first preset voltage difference threshold, and whether the current time from the most recent starting of the equalization marks of the cell cores is greater than a 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 CMU (battery management unit) is smaller than a first preset temperature threshold, the difference value between the highest cell voltage and the lowest cell voltage is larger than a first preset voltage difference threshold, the current distance is longer than the preset time, the time for starting the balance mark of the cell at the latest time is longer than the preset time, each cell of the charging pile has no cell fault, it is determined that the charging pile information meets a first preset condition, and the cell voltage of each cell is obtained.

2. The method of claim 1, wherein the determining a target cell from the individual cells according to the cell voltage of each individual cell comprises:

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.

3. The method of claim 1, wherein when the reacquired charging pile information satisfies a second preset condition, turning off a balancing flag of each target cell comprises:

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 a CMU (charge management unit) is larger than a second preset temperature threshold, or the difference value between the highest cell core voltage and the lowest cell core 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 cell core is closed.

4. The method of claim 1, further comprising:

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 balancing marks of the target single battery cells when the balancing time in each target single battery cell reaches the corresponding balancing time.

5. The method of claim 4, wherein the calculating an equalization time corresponding to each target individual cell according to a cell voltage of each target individual cell and a lowest individual cell voltage of the cell voltages of the individual cells comprises:

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.

6. The utility model provides a fill electric pile's monomer electricity core balancing unit which characterized in that, the device includes:

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;

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;

wherein the first obtaining unit includes:

A second obtaining unit, configured to obtain charging pile information when it is detected that a battery pack of a charging pile enters a charging state, where the charging pile information at least includes a state of charge value of the battery pack, a battery pack current, a time when an equalization flag of a single battery cell is turned on last time, a temperature of a CMU (battery management unit), a highest single battery cell voltage, and a 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 and the time of starting the balance mark of the cell at the latest time are greater than preset time, and each cell of the charging pile has no cell fault.

7. The apparatus of claim 6, wherein the first determining unit comprises:

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.

8. The apparatus of claim 6, wherein the first closing unit comprises:

the third acquiring unit is used for acquiring charging pile information again, wherein the charging pile information obtained again 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 single cell voltage and a lowest single 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;

A second closing unit, configured to, if the soc value of the battery pack is smaller than a second preset soc threshold, or the battery pack current 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 between the highest cell core voltage and the lowest cell core 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, determine that the re-acquired charging pile information satisfies a second preset condition, and close the balancing flag of each target cell core.

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