CN115995863A - Parallel operation charging control method, energy storage device, system and medium for multi-battery pack - Google Patents
Parallel operation charging control method, energy storage device, system and medium for multi-battery pack Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The embodiment of the application discloses a parallel operation charging control method and device of a multi-battery pack and energy storage equipment. The method comprises the following steps: calculating a charging current difference value between the required charging current of each battery pack and the actual charging current of each battery pack, and determining the battery pack with the smallest charging current difference value as a reference battery pack; calculating the target charging current of each battery pack in parallel charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack; determining a target parallel charging current according to the target charging current of each battery pack; generating a target charging instruction according to the target parallel charging current, and sending the target charging instruction to a power supply, wherein the target charging instruction is used for indicating the power supply to output the target parallel charging current to charge the multi-battery pack. The embodiment of the application can avoid the damage of the battery pack caused by the overcurrent problem.
Description
Technical Field
The application relates to the technical field of charge control, in particular to a parallel operation charge control method, energy storage equipment, a system and a medium of a multi-battery pack.
Background
With the increasing development of technology, electronic products have been called as indispensable daily necessities. In order to conveniently charge electronic products, various energy storage products such as mobile power supplies and the like are produced, and the most important energy storage part in the energy storage equipment is a battery pack.
The battery pack is liable to affect its lifetime if it is in an overcharged state for a long period of time, and therefore, charge control of the battery pack is important for improving the lifetime of the battery pack. When the multi-battery pack is in parallel machine charging, the charging control is more complicated, and the over-current charging is easier to cause, so that the charging control when the multi-battery pack is in parallel machine charging is realized, and the method is particularly important for prolonging the service life of the energy storage equipment.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present application provide a parallel operation charging control method and apparatus for a multi-battery pack, an energy storage device, an energy storage system, and a computer readable storage medium.
According to an aspect of the embodiments of the present application, there is provided a parallel charging control method of multiple battery packs, where the method is applied to a controller, and the controller establishes a communication connection with each battery pack, and the method includes: calculating a charging current difference value between the required charging current of each battery pack and the actual charging current of each battery pack, and determining the battery pack with the smallest charging current difference value as a reference battery pack; calculating the target charging current of each battery pack in parallel charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack; when the battery pack is in the parallel operation charging steady state, the charging current difference value of the reference battery pack is smaller than a preset current threshold value; determining a target parallel charging current according to the target charging current of each battery pack; generating a target charging instruction according to the target parallel charging current, and sending the target charging instruction to a power supply, wherein the target charging instruction is used for indicating the power supply to output the target parallel charging current to charge the multi-battery pack.
According to another aspect of the embodiments of the present application, there is provided a parallel operation charging control device for multiple battery packs, which is applied to a controller, and the controller establishes communication connection with each battery pack, and the device includes: a reference battery pack determining module configured to calculate a charging current difference value between a required charging current of each of the battery packs and an actual charging current of each of the battery packs, respectively, and determine a battery pack having a smallest charging current difference value as a reference battery pack; the target charging current calculation module is configured to calculate the target charging current of each battery pack in parallel charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack; when the battery pack is in the parallel operation charging steady state, the charging current difference value of the reference battery pack is smaller than a preset current threshold value; the target parallel operation charging current determining module is configured to determine target parallel operation charging current according to the target charging current of each battery pack; the target charging instruction sending module is configured to generate a target charging instruction according to the target parallel operation charging current and send the target charging instruction to a power supply, wherein the target charging instruction is used for indicating the power supply to output the target parallel operation charging current to charge the multi-battery pack.
According to another aspect of the embodiments of the present application, there is provided an energy storage device, where the parallel port is configured to connect with other energy storage devices or independent battery packs, where the controller establishes a connection with each battery pack, and where the memory stores computer readable instructions, where the computer readable instructions, when executed by the controller, implement a parallel charging control method for multiple battery packs as described above.
According to another aspect of an embodiment of the present application, there is provided an energy storage system, including at least two energy storage devices connected through a parallel port, at least one of the energy storage devices being an energy storage device as described above.
According to another aspect of the embodiments of the present application, there is provided a computer-readable storage medium having stored thereon computer-readable instructions, which when executed by a computer, cause the computer to perform the parallel charging control method of a multi-battery pack as described above.
The method and the device are applied to the parallel charging process of the multi-battery packs, so that the target charging current of each battery pack in a parallel charging steady state is calculated according to the required charging current of the battery pack and the actual charging current of each battery pack, the target parallel charging current required for the power supply is further determined, and because the reference battery pack is the battery with the minimum charging current difference, the actual charging current of the reference battery pack in the parallel charging process reaches the actual required charging current at first and is in the parallel charging steady state, the target charging current of each battery pack cannot exceed the required charging current of each battery pack when the power supply is required to charge according to the calculated target parallel charging current, the overcurrent problem can be avoided on the premise of ensuring that the charging current is large enough, the damage caused by the overcurrent in the battery pack charging process is reduced, and the service life of corresponding energy storage equipment is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a schematic illustration of a charging process for a single battery pack in an ideal state;
FIG. 2 is a schematic diagram of the charging process of a single battery pack in the case where the rate of rise of the power supply output current would be much lower than the rate of accumulation of the charging current requested by the proportional control algorithm;
FIG. 3 is a schematic diagram illustrating a multi-battery pack parallel charging architecture according to an exemplary embodiment of the present application;
FIG. 4 is a flow chart illustrating a method of parallel charging control of multiple battery packs according to an exemplary embodiment of the present application;
FIG. 5 is a flow chart of step S420 in the embodiment of FIG. 4 in one embodiment;
FIG. 6 is a flow chart of step S430 in the embodiment of FIG. 4 in one embodiment;
FIG. 7 is a flow chart of step S430 in the embodiment shown in FIG. 4 in another embodiment;
fig. 8 is a block diagram of a parallel operation charge control device of a multi-battery pack according to another exemplary embodiment of the present application;
fig. 9 is a schematic structural view of another exemplary energy storage device of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
Reference to "a plurality" in this application means two or more than two. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
First, the following definitions are introduced:
demand charge current of battery pack (need_chg_amp): the optimal charge current of the battery pack is determined by the battery pack characteristics and the battery pack hardware circuitry.
Actual charge current of battery pack (real_chg_amp): the actual charge current of the battery pack.
Charging current difference (error_value) of battery pack: is the difference between the required and actual charging currents of the battery pack, i.e., error_value=need_chg_amp-real_chg_amp.
Charging current (send_chg_amp) requested from power supply: the charging current actually requested from the power supply in the charging request. The power supply outputs a current with a corresponding magnitude to the battery pack according to the requested charging current. It will be appreciated that when multiple battery packs are charged in parallel, the charging current requested from the power supply is the target parallel charging current, i.e. the sum of the required charging currents of the battery packs.
Currently, the charging process of a single battery pack is generally controlled by a deviation control algorithm, such as a proportional control algorithm (also referred to as P correction), a derivative control algorithm (also referred to as D control), and a proportional integral derivative control algorithm (also referred to as PID correction), and the proportional control algorithm is described as an example in this application. The purpose of the charge control using the proportional control algorithm is to control the actual charge current of the battery pack to be around the required charge current, and the deviation thereof can be controlled within a preset threshold value, for example, around 1A. In the process of battery pack charging control by adopting a proportional control algorithm, the charging current provided by a power supply is requested to be calculated by the following formula:
send_chg_amp k ＝send_chg_amp k-1 +kp*error_value k
wherein, send_chg_amp k Indicating the current charge provided to the power supply request k-1 For the charging current provided for the last power supply request, the request period can be set according to the actual requirement k Indicating the current chargeDifference in electric current. kp represents a scaling factor, which is a value determined by the charging characteristics of the battery pack and the circuit characteristics of the charging circuit, and can be obtained through testing.
When real_chg_amp < need_chg_amp, error_value is positive, send_chg_amp will accumulate continuously, real_chg_amp gets progressively larger until near need_chg_amp. When real_chg_amp > new_chg_amp, error_value is negative, send_chg_amp gradually decreases, parallel charging current output by the power supply also decreases, and real_chg_amp correspondingly decreases until approaching the new_chg_amp. By constantly cycling through the charge control process as described above, the real_chg_amp is eventually stabilized around the new_chg_amp.
Referring to FIG. 1, both real_chg_amp and send_chg_amp eventually stabilize around the new_chg_amp under ideal conditions.
However, if the rising speed of the output current of the power supply is much lower than the rising speed of the charging current requested by the battery pack when the real_chg_amp rises slowly or the current output capability of the external power supply is limited, etc., the situation that the real_chg_amp is stabilized near the reed_chg_amp occurs, the send_chg_amp is much greater than the real_chg_amp, as shown in fig. 2.
For example, assume that the battery pack reed chg amp is 100A. At a certain moment, when the send_chg_amp is about 120A due to the limitation of the output capacity of the power supply, the real_chg_amp can reach about 100A. At this time, although the real_chg_amp can be stabilized around the reed_chg_amp, there is a hidden trouble: that is, the send_chg_amp currently sent to the power supply is far greater than the real_chg_amp, but at this time, since the power supply can only support the charging current of output 100A at maximum, if the output power of the power supply rises, for example, the power supply can support the charging current of output 120A (for example, the power supply determines the magnitude of the output current according to the sunlight intensity in a photovoltaic charging scenario), the power supply provides the charging current of 120A to the battery pack, that is, the real_chg_amp of the battery pack can reach about 120A, far exceeding the speed_chg_amp of the battery pack, at this time, over-current protection is triggered to turn off a charging MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal Oxide semiconductor field effect transistor) on the battery pack. After the overcurrent protection time passes, the above charging process is repeated, which can cause the repeated problem of overcurrent of the battery pack, thereby easily causing damage to the battery pack.
If the need chg amp is used as the send chg amp to request charging current from the power supply, no overcurrent problem occurs. However, the charging current required for charging the single battery pack, such as the wire loss voltage and the internal resistance of each battery pack, can be determined, but in the case of parallel charging of a plurality of battery packs, when the plurality of battery packs are charged in parallel, the total required charging current of the plurality of battery packs needs to consider the required charging current of the single battery pack, and the wire loss voltage and the internal resistance of each battery pack are also required to be considered, and are not determined, for example, the internal resistance of the current pack is changed during charging, and the wire loss voltage is determined by the change of the wire length of the battery pack connected by the power supply, and the wire length is also uncontrollable.
Referring to fig. 3 for example, fig. 3 is a schematic diagram illustrating a multi-battery pack parallel charging structure according to an exemplary embodiment of the present application. It should be noted that, fig. 3 only shows the case of parallel charging of three battery packs, and in an actual application scenario, the number of battery packs that are subjected to parallel charging may be set according to actual requirements, which is not limited herein. In addition, the multi-battery pack mentioned in the present application may be a plurality of battery packs installed in the same energy storage device, or may be a plurality of battery packs distributed in a plurality of energy storage devices. It can be appreciated that when the multi-battery pack parallel machine is charged, the charging current send_chg_amp requested from the power supply is the target parallel machine charging current.
As shown in fig. 3, when the battery pack a, the battery pack B, and the battery pack C are charged in parallel, the charging current I divided by each battery pack is calculated by the following formula:
i= (charging voltage Uc-battery pack voltage Ub-line loss voltage U1)/battery pack internal resistance
The charging voltage Uc of each battery pack is the same, and the battery pack voltage Ub of each battery pack has a deviation of several hundred millivolts, but the line loss voltage U1 of each battery pack and the internal resistance of the battery pack cannot be calculated, so that the charging current distributed by each battery pack cannot be calculated in the parallel charging process of a plurality of battery packs, and the total required charging current of a plurality of battery packs cannot be directly determined.
For example, if the required charging currents of the battery packs a-C are all 50A, and the sum of the required charging currents of the three battery packs is directly taken as the total required charging current 150A, the current ratio obtained by each battery pack is not consistent with the ratio between the required charging currents of each battery pack due to the different line loss or internal resistance of each battery pack. For example, the following may occur: the actual charging current of the battery pack a is 50A, the actual charging current of the battery pack B is only 20A, the actual charging current of the battery pack C is only 30A, that is, the actual charging current ratio obtained by dividing each battery pack is not 1:1:1, but 5:2:3. if 150A current is requested to the power supply at this time, the actual charging current of the battery pack A is 75A, which is far more than the required charging current 50A of the battery pack A, so that the problem of overcurrent protection of the battery pack A occurs.
In an actual application scene, no known parameters are available for calculating the current distribution proportion among the battery packs in advance, so that the total required charging current of the multiple battery packs during parallel charging of the multiple battery packs cannot be accurately determined.
In order to solve the above problems in the multi-battery pack parallel-operation charging scenario, the embodiment of the application provides a parallel-operation charging control scheme of the multi-battery pack. The contents of these embodiments will be described in detail below.
Referring to fig. 4, fig. 4 is a flowchart illustrating a parallel charging control method of a multi-battery pack according to an exemplary embodiment of the present application. The method is applied to a controller in the energy storage device, and the controller is in communication connection with each battery pack. As shown, the method includes steps S410-S440.
S410, respectively calculating the charging current difference value between the required charging current of each battery pack and the actual charging current of each battery pack, and determining the battery pack with the smallest charging current difference value as the reference battery pack.
As previously described, the required charge current for an individual battery pack is determined by the battery pack characteristics and the battery pack hardware circuitry, and therefore, the required charge current for each battery pack is already determined at the completion of the circuit design. The actual charging current of the single battery pack can be obtained through sampling, for example, through sampling a resistor or a current sensor, so that the charging current difference value of the single battery pack can be calculated in the parallel charging process of the multi-battery pack.
For the battery pack with the smallest charging current difference, the battery pack will reach the charging steady state first in the parallel charging process, that is, the actual charging current will be near the required charging current first, so it is determined as the reference battery pack. It will be appreciated that for multi-battery pack parallel charging, when any one battery pack is in a charge steady state, then multi-battery pack parallel charging may be considered to be already in a parallel charge steady state.
S420, calculating target charging current of each battery pack in parallel machine charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack; when the battery pack is in parallel charging steady state, the charging current difference value of the reference battery pack is smaller than a preset current threshold value.
In parallel charging steady state, the actual charging current of the reference battery pack is near the required charging current, that is, the charging current difference of the reference battery pack is smaller than the preset current threshold, the preset current threshold is usually a current value with smaller value, so as to represent that the deviation between the actual charging current of the reference battery pack and the required charging current is small in parallel charging steady state.
In consideration of the fact that the actual charging current of each battery pack has a proportional relation in the parallel charging process, when parallel charging is stable, the target charging current of the reference battery pack is close to the required charging current of the reference battery pack, and therefore the target charging current of each battery pack can be calculated according to the required charging current of the reference battery pack and the actual charging current value of each battery pack.
It is to be understood that, here, the target charging current of each battery pack refers to a charging current that is outputted from the power supply and that can be distributed to each battery pack, excluding a portion lost due to a line loss or an internal resistance of the battery.
And S430, determining a target parallel charging current according to the target charging current of each battery pack.
As described above, in the parallel charging steady state, the actual charging current of the reference battery pack reaches the required charging current first, and at this time, the actual charging currents of the other battery packs except the reference battery pack are smaller than or equal to the required charging current. Therefore, as long as the actual charging current of the reference battery pack is controlled to be the required charging current, the actual charging current of each battery pack is ensured not to exceed the required charging current, and the problem of overcurrent of the battery pack is avoided, and the moment that the charging current is the most stable, the safer and the most reasonable is considered.
Since the target charging current of each battery pack in the parallel charging steady state has been determined in step S420 based on the required charging current of the reference battery pack and the actual charging current value of each battery pack, that is, the charging current which is output by the power supply and can be allocated to each battery pack has been determined, the target parallel charging current which is requested to the power supply can be further determined.
It should be understood that the target parallel charging current may be determined directly according to the sum of the target charging currents of the battery packs, or may also determine whether to use the target charging current according to different charging states. For example, the candidate charging current may be calculated according to the deviation adjustment algorithm mentioned above, and the target charging current may be compared with the candidate current, so as to select a suitable current as the final target parallel charging current.
S440, generating a target charging instruction according to the target parallel operation charging current, and sending the target charging instruction to the power supply, wherein the target charging instruction is used for indicating the power supply to output the target parallel operation charging current to charge the multi-battery pack.
The target charging instruction carries target parallel operation charging current, and the power supply charges the multi-battery pack according to the target parallel operation charging current requested by the multi-battery pack after receiving the target charging instruction.
As can be seen from the above, in this embodiment, the target charging current of each battery pack in the parallel operation charging steady state is calculated by referring to the required charging current of the battery pack and the actual charging current of each battery pack, so as to further determine the target parallel operation charging current required for the power supply, and since the reference battery pack is the battery with the smallest charging current difference, the actual charging current of the reference battery pack reaches the actual required charging current first in the parallel operation charging process and is in the parallel operation charging steady state, so that the target charging current of each battery pack calculated according to the application does not exceed the required charging current of each battery pack when the power supply is required to charge, and the occurrence of an overcurrent problem can be avoided under the premise of ensuring that the charging current is sufficiently large, the occurrence of damage due to the overcurrent problem in the battery pack charging process is reduced, and the service life of the corresponding energy storage device is improved.
It should be understood that the parallel charging process of the multi-battery pack is also a dynamic process, for example, when the parallel charging is just entered, the controller may generate an instruction according to a preset initial parallel charging current to request the power supply to output the charging power, and in the subsequent charging process, the target parallel charging current is dynamically calculated according to the method provided in the embodiment to request the charging to the power supply until the charging is stopped after the charging is completed.
In addition, it should be noted that, the controller may determine the number of the connected battery packs according to the received heartbeat information by receiving the heartbeat information sent by each battery pack, and execute the parallel charging control process disclosed in the method provided by the embodiment after determining that the number is greater than 1, that is, after determining the parallel charging scene of the current multi-battery pack.
As an exemplary embodiment, as shown in fig. 5, the process of calculating the target charging current of each battery pack at the parallel charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack in step S420 includes the following steps S421 to S423.
S421, taking the required charging current of the reference battery pack as the target charging current of the reference battery pack in the parallel charging steady state.
As described above, in the parallel charging steady state, the actual charging current of the reference battery pack reaches the required charging current first, and the actual charging current of the reference battery pack is in the vicinity of the required charging current, so the required charging current of the reference battery pack is taken as the target charging current of the reference battery pack in the parallel charging steady state.
S422, calculating the proportional relation between the actual charging current of the reference battery pack and the actual charging current of the target battery pack, wherein the target battery pack is any battery pack except the battery packs in the multi-battery packs.
In the parallel charging process of the multiple battery packs, the ratio between the actual charging current of each battery pack is unchanged, so that the proportional relation between the actual charging current of the reference battery pack and the actual charging current of the target battery pack can be calculated.
For example, in the scenario shown in fig. 3, if the actual charging current of the battery pack a is denoted as I A The actual charging current of battery pack B is denoted as I B The actual charging current of the battery pack C is denoted as I C Based on the characteristics of the parallel circuit, at any time, I A 、I B 、I C The ratio between them is constant. Therefore, as long as the proportional relationship is determined and the actual current of one battery pack is determined at any one time, the actual charging current required for the other battery packs, that is, the target charging current, can be determined.
S423, calculating the target charging current of each target battery pack in parallel charging steady state according to the proportional relation and the target charging current of the reference battery pack.
Still taking the scenario shown in fig. 3 as an example, the charging current difference of battery pack a is represented as error_i A The charging current difference of battery pack B is expressed as error_i B The charging current difference of the battery pack C is expressed as error_i C The charge current that would also require an increase in battery pack a to parallel charge steady state is denoted as Δi A The charge current that would also require an increase to battery pack B to parallel charge steady state is denoted as Δi B The charge current that would also require an increase in battery pack C to parallel charge steady state is denoted as Δi C 。
Assume error_I A The minimum, battery pack a is thus determined as the reference battery pack. As described above, the actual charging current of the reference battery pack is infinitely close to the required charging current at the time of parallel charging steady state, and thus the target charging current of the reference battery pack can be determined as the required charging current. According to the charging current required by the battery pack A, the charging delta I required by the battery pack A can be calculated A ＝error_I A To enter parallel charging steady state.
Known proportional relationship
And DeltaI A Wherein:
I A ' and I B ' indicating the target charging currents of battery packs A and B in parallel charging steady state, the method can obtain 
Similarly, get->
Therefore, the target charging current of the battery pack B in the parallel charging steady state is I B +ΔI B The target charging current of the battery pack C in parallel charging steady state is I C +ΔI C 。
As can be seen from the above, in this embodiment, according to the proportional relationship of the actual charging currents of the battery packs and the target charging currents of the reference battery packs, the target charging currents of the target battery packs in the parallel charging steady state can be calculated, so that the target parallel charging currents for requesting the power supply can be determined conveniently based on the target charging currents of the battery packs.
As an exemplary embodiment, as shown in fig. 6, the process of determining the target parallel charging current according to the target charging current of each battery pack in step S430 includes the following steps S431 to S434:
s431, determining a first candidate charging current according to the target charging current of each battery pack.
In the present embodiment, the first candidate charging current is the sum of the target charging currents of the respective battery packs obtained in step S420.
S432, determining a second candidate charging current according to the historical parallel operation charging current and the proportional control algorithm, wherein the historical parallel operation charging current is the last determined target parallel operation charging current.
As described above, in the process of performing battery pack charging control by using the proportional control algorithm, the charging current provided to the power supply request at this time is determined according to the charging current provided to the power supply request at the last time. In this embodiment, the second candidate charging current is determined according to the historical parallel charging current and the proportional control algorithm. It will be appreciated that the second candidate charging current is a charging current that may be provided to the power supply request as determined using a proportional control algorithm.
S433, if the first candidate charging current is smaller than the second candidate charging current, determining the first candidate charging current as the target parallel charging current.
If the first candidate charging current is smaller than the second candidate charging current, the charging current which is determined based on the sum of the target charging currents of the battery packs and can be provided for the power supply request is smaller than the charging current which is determined by adopting a proportional control algorithm and can be provided for the power supply request. By determining the first candidate charging current as the target parallel operation charging current, the actual charging current obtained by each battery pack cannot exceed the required charging current when the target parallel operation charging current is required to be provided for the power supply, and therefore the problem of overcurrent of the battery packs cannot occur.
And S434, if the first candidate charging current is greater than or equal to the second candidate charging current, determining the second candidate charging current as the target parallel charging current.
And if the first candidate charging current is greater than or equal to the second candidate charging current, the charging current which is determined based on the sum of the target charging currents of the battery packs and can be provided for the power supply request is greater than or equal to the charging current which is determined by adopting a proportional control algorithm and can be provided for the power supply request. At this time, by determining the second candidate charging current as the target parallel operation charging current, it is ensured that the actual charging current obtained by each battery pack does not exceed the required charging current when the power supply is requested to supply the target parallel operation charging current, thereby avoiding the occurrence of the overcurrent problem.
It can be seen that in the process illustrated above, the process of parallel charging of multiple battery packs is controlled by combining the proportional control algorithm, the most suitable target parallel charging current is finally determined by comparing the magnitudes of the first candidate charging current and the second candidate charging current, and the finally determined target parallel charging current is necessarily the smaller value of the first candidate charging current and the second candidate charging current, so as to ensure that the problem of battery pack overcharge does not occur.
As another exemplary embodiment, the process of determining the target parallel charging current according to the target charging current of each battery pack in step S430 is as follows: and summing the target charging currents of the battery packs, and determining the summation result as the target parallel charging current. In this embodiment, the process of parallel charging of multiple battery packs is not combined with the use of the proportional control algorithm, but the sum of the target charging currents of the battery packs obtained in step S420 is directly used as the target parallel charging current to request the charging current to the power supply, so that the computing resource consumption of the controller can be reduced while the occurrence of the overcurrent problem is not guaranteed.
As another exemplary embodiment, as shown in fig. 7, the process of determining the target parallel charging current according to the target charging current of each battery pack in step S430 may further include the following steps S435 to S437.
S435, determining parallel operation charging current according to historical parallel operation charging current and a proportional control algorithm, wherein the historical parallel operation charging current is the last determined target parallel operation charging current.
The process of determining the parallel operation charging current according to the historical parallel operation charging current and the proportional control algorithm is consistent with the process of determining the second candidate charging current in step S432, and will not be described in detail here.
And S436, determining the parallel operation charging current as a target parallel operation charging current when the battery pack does not enter a parallel operation charging steady state.
When the battery pack does not enter the parallel charging steady state, the actual charging current of the battery pack is in a gradually rising stage, so that the problem of battery pack overcurrent does not occur generally, and the parallel charging current obtained in step S435 can be determined as the target parallel charging current, that is, the parallel charging current determined based on the proportional control algorithm is taken as the target parallel charging current to request charging to the power supply.
S437, when the battery pack enters a parallel operation charging steady state, comparing the parallel operation charging current with the actual charging current of the multi-battery pack; if the difference value between the parallel operation charging current and the actual charging current of the multi-battery packs is larger than the preset current difference value, summing the target charging currents of the battery packs to obtain target parallel operation charging current; if the difference value between the parallel charging current and the actual charging current of the multi-battery pack is smaller than the preset current difference value, the parallel charging current is determined to be the target parallel charging current.
When the battery pack enters a parallel charging steady state, that is, the actual charging current of the reference battery pack is already infinitely close to the required charging current of the reference battery pack, the parallel charging current needs to be compared with the actual charging current of the multi-battery pack. The actual charging current of the multi-cell pack is understood to be the sum of the actual charging currents of the individual cell packs.
If the difference between the parallel charging current and the actual charging current of the multi-battery pack is greater than the preset current difference, for example, the preset current difference is 5A, the parallel charging current determined based on the proportional control algorithm is far beyond the actual charging current of the multi-battery pack, and if the parallel charging current is used for requesting the power supply to provide the charging current, the problem of overcurrent is easily caused, so that the target parallel charging current is obtained by summing the target charging currents of the battery packs.
If the difference between the parallel charging current and the actual charging current of the multi-battery pack is smaller than the preset current difference, the parallel charging current determined by the proportional control algorithm is used for requesting the power supply to provide the charging current without causing an overcurrent problem, so that the parallel charging current can be used for requesting the power supply to provide the charging current.
As can be seen from the above process, the present embodiment still combines the proportional control algorithm to control the parallel charging process of the multi-battery pack, and determines whether to use the sum of the target charging currents as the target parallel charging current according to different charging states, so that a suitable current can be selected as the final target parallel charging current, thereby ensuring that the battery pack will not have an overcurrent problem.
It should be noted that, the determination manner of the target parallel operation charging current as illustrated above may be selected according to the actual application requirement, which is not limited in this embodiment.
According to the technical scheme provided by the embodiment of the application, the target charging current when each battery pack reaches the parallel charging steady state in the parallel charging process of the multi-battery pack can be accurately and dynamically calculated, and is fed back to the power supply to request for adjusting the charging current, and the problem that the battery packs repeatedly overflow due to the fact that the charging current of each battery pack is suddenly increased when the output capacity of the power supply changes is solved, so that the maximum current is used for charging the battery packs most rapidly under the safest condition.
Referring to fig. 8, fig. 8 is a block diagram of a parallel operation charge control device of a multi-battery pack according to another exemplary embodiment of the present application. The device is applied to a controller, and the controller is in communication connection with each battery pack. As shown in fig. 8, the apparatus includes a reference battery pack determination module 510, a target charging current calculation module 520, a target parallel charging current determination module 530, and a target charging instruction transmission module 540.
The reference battery pack determination module 510 is configured to calculate charging current differences between the required charging current of each battery pack and the actual charging current of each battery pack, respectively, and determine the battery pack with the smallest charging current difference as the reference battery pack.
The target charging current calculation module 520 is configured to calculate a target charging current for each battery pack at steady state of parallel charging according to a required charging current of the reference battery pack and an actual charging current value of each battery pack. When the battery pack is in parallel charging steady state, the charging current difference value of the reference battery pack is smaller than a preset current threshold value.
The target parallel charging current determination module 530 is configured to determine a target parallel charging current from the target charging currents of the respective battery packs.
The target charging instruction sending module 540 is configured to generate a target charging instruction according to the target parallel charging current, and send the target charging instruction to the power supply, where the target charging instruction is used to instruct the power supply to output the target parallel charging current to charge the multi-battery pack.
In another exemplary embodiment, the target charging current calculation module 520 includes a target charging current determination unit, a proportional relationship calculation unit, and a target charging current calculation unit.
The target charging current determining unit is configured to refer to the target charging current of the battery pack when parallel charging is steady-state with the required charging current of the reference battery pack.
The proportional relation calculating unit is configured to calculate a proportional relation between an actual charging current of the reference battery pack and an actual charging current of the target battery pack.
The target charging current calculation unit is configured to calculate a target charging current of each target battery pack at a parallel machine charging steady state according to the proportional relationship and a target charging current of a reference battery pack, the target battery pack being any battery pack other than the reference battery pack among the plurality of battery packs.
In another exemplary embodiment, the target parallel charging current determination module 530 includes a first candidate charging current determination unit, a second candidate charging current determination unit, and a target determination unit.
The first candidate charging current determination unit is configured to determine a first candidate charging current according to a target charging current of each battery pack.
The second candidate charging current determining unit is configured to determine a second candidate charging current according to a historical parallel charging current and a proportional control algorithm, wherein the historical parallel charging current is a target parallel charging current determined last time.
The target determining unit is configured to determine the first candidate charging current as a target parallel charging current if the first candidate charging current is smaller than the second candidate charging current; and if the first candidate charging current is greater than or equal to the second candidate charging current, determining the second candidate charging current as the target parallel charging current.
In another exemplary embodiment, the target parallel charging current determination module 530 is configured to sum the target charging currents of the battery packs, and determine the result of the summation as the target parallel charging current.
In another exemplary embodiment, the target parallel charging current determination module 530 includes a parallel charging current determination unit and a target switching selection unit.
The parallel operation charging current determining unit is configured to determine parallel operation charging current according to historical parallel operation charging current and a proportion control algorithm, wherein the historical parallel operation charging current is the last determined target parallel operation charging current.
The target switching selection unit is configured to determine the parallel operation charging current as a target parallel operation charging current when the battery pack does not enter a parallel operation charging steady state; when the battery pack enters a parallel charging steady state, comparing the parallel charging current with the actual charging current of the multi-battery pack; if the difference value between the parallel operation charging current and the actual charging current of the multi-battery packs is larger than the preset current difference value, summing the target charging currents of the battery packs to obtain target parallel operation charging current; if the difference value between the parallel charging current and the actual charging current of the multi-battery pack is smaller than the preset current difference value, the parallel charging current is determined to be the target parallel charging current.
In another exemplary embodiment, the apparatus further comprises:
the mode determining module is configured to receive heartbeat information sent by each battery pack, determine the number of the accessed battery packs according to the heartbeat information, and if the number is greater than 1, jump to the reference battery pack determining module 510.
It should be noted that, the parallel operation charging control device for the multi-battery pack provided by the above embodiment and the parallel operation charging control method for the multi-battery pack provided by the above embodiment belong to the same concept, and the specific manner in which each module and unit execute the operation has been described in detail in the method embodiment, which is not repeated here. In practical application, the parallel charging control device for multiple battery packs provided in the above embodiment may allocate the functions to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, which is not limited herein.
The parallel charging control device for the multi-battery packs can accurately and dynamically calculate the target charging current when each battery pack reaches the parallel charging steady state in the parallel charging process of the multi-battery packs, and feed the target charging current back to the power supply to request adjustment of the charging current, and the problem that the charging current of each battery pack repeatedly overflows due to the fact that the charging current of each battery pack is suddenly increased when the output capacity of the power supply changes is solved, so that the maximum current is used for charging the battery packs most safely.
Embodiments of the present application also provide an energy storage device, as shown in fig. 9, an exemplary energy storage device 600 includes: parallel port 610, controller 620, memory 630, and at least one battery pack 640.
The parallel port 610 is used to provide a parallel function of the energy storage device 600, such as connecting with other energy storage devices or a separate battery pack. Illustratively, as shown in fig. 9, the energy storage device 600 may be connected in parallel with the independent battery pack 700 through a parallel port 610. In a state where the energy storage device 600 is in charge, that is, a parallel charging scenario of multiple battery packs is implemented.
The controller 620 establishes connections with the respective battery packs. It should be noted that the controller 620 may be in the energy storage device 600, or may be other than the energy storage device 600, for example, the controller 620 is disposed in a battery pack incorporated through the parallel port 610. When the controller 620 is disposed in the storage device 600, the controller 620 is connected not only with each battery pack 640 in the energy storage device 600, but also with the incorporated battery pack or battery packs in other incorporated energy storage devices through the parallel port 610. When the controller 620 is disposed outside the storage device 600, the controller 620 is connected to each battery pack 640 in the energy storage device 600 through the parallel port 610.
The memory 630 stores computer readable instructions, and is connected to the controller 620, where the computer readable instructions, when executed by the controller 620, cause the energy storage device to implement the parallel charging control method for multiple battery packs provided in the foregoing embodiments, so as to ensure that the problem of battery pack overcurrent does not occur in the parallel charging process.
It is understood that the Memory is, for example, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, etc., and the present embodiment is not limited herein.
Some embodiments of the present application also provide an energy storage system comprising at least two energy storage devices connected through a parallel port, at least one of the energy storage devices being an energy storage device as described above. Still referring to fig. 9, two energy storage devices 600 are connected through respective parallel ports 610, and the battery packs within the two energy storage devices are combined to form a multi-battery pack. At this time, the controller 620 of any one of the energy storage devices 600 may be selected as a main controller, and the parallel charging current control method of the multi-battery pack as described above may be performed.
Another aspect of the present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a parallel charging control method for a multi-battery pack as described above. The computer readable storage medium may be included in the energy storage device described in the above embodiments or may exist alone without being assembled into the energy storage device.
The computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium may be, for example, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of the computer-readable storage medium may include, but are not limited to: the present embodiment is not limited in this regard, as an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing is merely a preferred exemplary embodiment of the present application and is not intended to limit the embodiments of the present application, and those skilled in the art may make various changes and modifications according to the main concept and spirit of the present application, so that the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The parallel charging control method of the multi-battery pack is applied to a controller, and the controller is in communication connection with each battery pack, and is characterized by comprising the following steps of:
calculating a charging current difference value between the required charging current of each battery pack and the actual charging current of each battery pack, and determining the battery pack with the smallest charging current difference value as a reference battery pack;
calculating the target charging current of each battery pack in parallel charging steady state according to the required charging current of the reference battery pack and the actual charging current value of each battery pack; when the battery pack is in the parallel operation charging steady state, the charging current difference value of the reference battery pack is smaller than a preset current threshold value;
determining a target parallel charging current according to the target charging current of each battery pack;
Generating a target charging instruction according to the target parallel charging current, and sending the target charging instruction to a power supply, wherein the target charging instruction is used for indicating the power supply to output the target parallel charging current to charge the multi-battery pack.
2. The method of claim 1, wherein calculating the target charge current for each of the battery packs at parallel charge steady state based on the required charge current for the reference battery pack and the actual charge current value for each of the battery packs comprises:
taking the required charging current of the reference battery pack as the target charging current of the reference battery pack when parallel charging is stable;
calculating the proportional relation between the actual charging current of the reference battery pack and the actual charging current of the target battery pack;
and calculating the target charging current of each target battery pack in parallel charging steady state according to the proportional relation and the target charging current of the reference battery pack, wherein the target battery pack is any battery pack except the reference battery pack in the multi-battery pack.
3. The method of claim 1, wherein said determining a target parallel charging current from a target charging current for each of said battery packs comprises:
Determining a first candidate charging current according to the target charging current of each battery pack;
determining a second candidate charging current according to the historical parallel operation charging current and a proportional control algorithm, wherein the historical parallel operation charging current is the last determined target parallel operation charging current;
if the first candidate charging current is smaller than the second candidate charging current, determining the first candidate charging current as a target parallel charging current;
and if the first candidate charging current is greater than or equal to the second candidate charging current, determining the second candidate charging current as a target parallel charging current.
4. The method of claim 1, wherein said determining a target parallel charging current from a target charging current for each of said battery packs comprises:
and summing the target charging currents of the battery packs, and determining the summation result as the target parallel charging current.
5. The method of claim 1, wherein said determining a target parallel charging current from a target charging current for each of said battery packs comprises:
determining parallel operation charging current according to historical parallel operation charging current and a proportional control algorithm, wherein the historical parallel operation charging current is the last determined target parallel operation charging current;
When the battery pack does not enter a parallel charging steady state, determining the parallel charging current as the target parallel charging current;
when the battery pack enters a parallel charging steady state, comparing the parallel charging current with the actual charging current of the multi-battery pack; and if the difference value between the parallel operation charging current and the actual charging current of the multi-battery pack is larger than a preset current difference value, summing the target charging current of each battery pack to obtain the target parallel operation charging current.
6. The method of claim 5, wherein said determining a target parallel charging current from a target charging current for each of said battery packs further comprises:
and if the difference value between the parallel charging current and the actual charging current of the multi-battery pack is smaller than the preset current difference value, determining the parallel charging current as a target parallel charging current.
7. The method of any one of claims 1-6, wherein the parallel charging control method further comprises:
receiving heartbeat information sent by each battery pack;
determining the number of the accessed battery packs according to the heartbeat information;
and if the number is greater than 1, executing the step of determining the charging current difference value between the required charging current and the actual charging current of each battery pack, and determining the battery pack with the smallest charging current difference value as the target battery pack.
8. An energy storage device, which is characterized by comprising a parallel port, a controller, a memory and a battery pack;
the parallel port is used for being connected with other energy storage devices or independent battery packs;
the controller is connected with each battery pack;
the memory having stored thereon computer readable instructions which, when executed by the controller, implement the method of any of claims 1-7.
9. An energy storage system comprising at least two energy storage devices connected through a parallel port, at least one of the energy storage devices being the energy storage device of claim 8.
10. A computer readable program medium, characterized in that it stores computer program instructions, which when executed by a computer, cause the computer to perform the method according to any of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211099154.1A CN115995863A (en) | 2022-09-05 | 2022-09-05 | Parallel operation charging control method, energy storage device, system and medium for multi-battery pack |
| PCT/CN2022/132155 WO2024050964A1 (en) | 2022-09-05 | 2022-11-16 | Parallel charging control method for multiple battery packs, and energy storage device and system |
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| CN202211099154.1A CN115995863A (en) | 2022-09-05 | 2022-09-05 | Parallel operation charging control method, energy storage device, system and medium for multi-battery pack |
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| CN101572416B (en) * | 2009-06-01 | 2012-09-12 | 中国北车集团大连机车车辆有限公司 | Method for controlling diesel generating set parallel connection by using computer |
| US20140203780A1 (en) * | 2013-01-24 | 2014-07-24 | Texas Instruments Incorporated | System and method for active charge and discharge current balancing in multiple parallel-connected battery packs |
| JP6794960B2 (en) * | 2017-08-22 | 2020-12-02 | トヨタ自動車株式会社 | Power system |
| CN112913106A (en) * | 2020-04-26 | 2021-06-04 | 深圳市大疆创新科技有限公司 | Charging control method, charger, charging system and storage medium |
| CN113206526B (en) * | 2021-05-07 | 2023-08-18 | 广东汇天航空航天科技有限公司 | Charging control method and device, electric manned aircraft and storage medium |
| CN114567028B (en) * | 2021-09-13 | 2023-01-03 | 惠州市乐亿通科技有限公司 | Battery system and parallel operation method and device thereof |
| CN114598003A (en) * | 2022-03-17 | 2022-06-07 | 上海沃兰特航空技术有限责任公司 | Charging method, charging device and storage medium |
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