CN114598003A

CN114598003A - Charging method, charging device and storage medium

Info

Publication number: CN114598003A
Application number: CN202210265690.8A
Authority: CN
Inventors: 黄耀达; 王春强; 丁昆昆; 党铁红; 董明
Original assignee: Shanghai Volant Aerotech Ltd
Current assignee: Shanghai Volant Aerotech Ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-06-07

Abstract

The present disclosure relates to a charging method, a charging device, and a storage medium, where the method is applied to a battery management system, the battery management system connects a plurality of parallel battery packs, and the method includes: acquiring state information of at least one parallel battery pack; obtaining a first request current of each battery pack according to the state information; adjusting a first request current of each battery pack according to the charging current of each battery pack acquired in real time; according to the adjusted first request current of each battery pack, updating the current parameters output to the charging pile, and providing charging current for the plurality of parallel battery packs by the charging pile according to the current parameters. According to the charging method disclosed by the embodiment of the disclosure, the charging current of each battery pack can be in a safe range, and meanwhile, the charging efficiency and reliability of the battery pack are improved.

Description

Charging method, charging device and storage medium

Technical Field

The present disclosure relates to the field of avionics, and in particular, to a charging method, a charging device, and a storage medium.

Background

Electric aircraft refers to aircraft that rely on electric motors to provide power. Which is typically loaded with a battery system to provide power to the motor during flight. In order to ensure a sufficient safety margin, the battery system of the electric aircraft is generally composed of a plurality of mutually independent battery packs connected in parallel, but the battery system is different from the battery systems of the traditional electric passenger vehicles and electric trucks in that each battery pack of the electric aircraft can comprise an independently controllable high-voltage relay which can be independently disconnected during the charging and discharging process so as to ensure that the battery system can still output sufficient power even if the battery pack fails. However, this structure also causes a problem: the state of charge of multiple parallel battery packs at the same time may be different. State of charge (SOC) refers to the ratio of the remaining capacity of a battery pack to its fully charged capacity, usually expressed as a percentage. The state of charge is again associated with the maximum allowable charging current of the battery pack without being damaged, which greatly increases the difficulty of ensuring that the actual charging current of each battery pack is within a safe range during the charging process.

Although the prior art proposes a technical scheme for ensuring the actual charging current of each battery pack to be in a safe range, the prior art has the defects of low charging efficiency, low reliability and the like, so that the charging technology of a battery system with a plurality of battery packs connected in parallel still has an optimization space.

Disclosure of Invention

In view of the above, the present disclosure provides a charging method, a charging apparatus, and a storage medium, according to the charging method of the embodiments of the present disclosure, the charging current of each battery pack is within a safe range, and the charging efficiency and reliability of the battery pack are improved.

According to an aspect of the present disclosure, there is provided a charging method applied to a battery management system that connects a plurality of parallel battery packs, the method including: acquiring state information of at least one parallel battery pack; obtaining a first request current of each battery pack according to the state information; adjusting the first request current of each battery pack according to the charging current of each battery pack acquired in real time; and updating the current parameters output to a charging pile according to the adjusted first request current of each battery pack, wherein the charging pile provides the charging current for the plurality of parallel battery packs according to the current parameters.

In one possible implementation manner, the adjusting the first request current of each battery pack according to the charging current of each battery pack collected in real time includes: determining a first difference value between the first request current and the charging current of each battery pack; respectively carrying out proportional integral operation on the first difference values to obtain first integral values; and adjusting the first request current of each battery pack according to the magnitude relation of the first integral value and a first threshold value.

In one possible implementation manner, the adjusting the first request current of each battery pack according to the magnitude relationship between the first integrated value and the first threshold value includes: for each battery pack, when the first integral value is larger than a first threshold value, enabling the value of the adjusted first request current to be equal to the difference between the original first request current and the first integral value; and when the first integral value is smaller than or equal to a first threshold value, enabling the value of the adjusted first request current to be equal to the original first request current.

In a possible implementation manner, the updating the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes: and updating the total request current to the sum of the first request currents of each battery pack after regulation.

In one possible implementation manner, the adjusting the first request current of each battery pack according to the magnitude relationship between the first integrated value and the first threshold value includes: for each battery pack, the first request current is adjusted so that the first integration value is less than or equal to a second threshold value.

In a possible implementation manner, the updating the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes: and updating the total request current to the minimum first request current in the regulated first request currents.

In a possible implementation manner, the obtaining the first request current of each battery pack according to the state information includes: and for each battery pack, determining a first request current corresponding to the temperature and the charge state of the battery pack according to the association relation between the temperature and the charge state of the battery pack and the first request current.

In one possible implementation, the method further includes: acquiring the monomer voltage of each battery monomer of each battery pack; judging whether each battery pack meets a preset condition, wherein the preset condition comprises that the maximum monomer voltage in the monomer voltages of the battery monomers of the battery pack reaches a cut-off voltage corresponding to the battery pack; controlling a relay in the battery pack meeting the preset condition to be switched off, and adjusting the state of charge of the battery pack meeting the preset condition to a maximum value; the updating of the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes: and updating the current parameter according to the sum of the adjusted first request currents of the battery packs which do not meet the preset condition.

According to another aspect of the present disclosure, there is provided a charging method applied to a battery management system that connects a plurality of parallel battery packs, the method including: determining the cut-off voltage of each battery cell of at least one parallel battery pack; acquiring the charging current of each battery pack and the single voltage of each battery in each battery pack; performing first proportional integral operation on a difference value between a cut-off voltage corresponding to the maximum monomer voltage and the maximum monomer voltage to obtain a third integral value; performing a second proportional integral operation according to the third integral value and the current value of the charging current of the battery pack corresponding to the maximum cell voltage to obtain a fourth integral value; and controlling the charging voltage of each battery pack according to the fourth integrated value, so that the charging voltage of each battery pack is equal to the difference between the cut-off voltage corresponding to the maximum cell voltage and the fourth integrated value.

In one possible implementation, the method further includes: judging whether each battery pack meets a preset condition, wherein the preset condition comprises that the maximum monomer voltage in the monomer voltages of the battery monomers of the battery pack reaches a cut-off voltage corresponding to the battery pack; updating the current parameter according to the sum of the first request currents of the battery packs which do not meet the preset condition; and controlling the relay in the battery pack meeting the preset condition to be switched off, and adjusting the state of charge of the battery pack meeting the preset condition to the maximum value.

According to another aspect of the present disclosure, there is provided a charging device including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the above-described method when executing the memory-stored instructions.

According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.

According to another aspect of the present disclosure, there is provided a computer program product comprising computer readable code, or a non-transitory computer readable storage medium carrying computer readable code, which when run in a processor of an electronic device, the processor in the electronic device performs the above method.

According to the charging method disclosed by the embodiment of the disclosure, the current parameter is obtained firstly through the state information, then the current parameter is updated through the charging current acquired in real time, and the current parameter is not determined through the maximum cell voltage, so that the change of the maximum cell voltage has no influence on the determination of the current parameter, and the accuracy of the current parameter can be improved. The charging method provided by the embodiment of the disclosure does not always perform charging according to the current parameter obtained from the state information, but performs charging according to the current parameter which is continuously updated, so that the charging method is more suitable for practical application scenarios, and the accuracy of the current parameter can be further improved. Due to the fact that the accuracy of the current parameters is improved, the charging method can enable the charging current of each battery pack to be within a safe range, and meanwhile the charging efficiency of the battery packs is improved. The method is executed by a battery management system, and no additional circuit is added, so that the hardware cost and weight are not increased, and the higher reliability of the system can be kept. Therefore, according to the charging method disclosed by the embodiment of the disclosure, the charging current of each battery pack can be in a safe range, and meanwhile, the charging efficiency and reliability of the battery pack are improved.

According to the charging method provided by the embodiment of the application, the cut-off voltage of the battery cell is determined, and then the charging voltage is controlled through proportional-integral operation, so that the control of the charging current can be indirectly realized. In the primary control process aiming at the charging voltage, only the corresponding maximum monomer voltage needs to be selected, and proportional-integral operation is carried out for two times, so that the charging method can reduce the proportional-integral operation times and reduce the data processing cost. And therefore the control of the charging voltage is more stable than the scheme of directly regulating the current. Therefore, the charging method disclosed by the embodiment of the disclosure can enable the charging current of each battery pack to be in a safe range, and meanwhile, the charging efficiency of the battery pack is improved. The method is executed by a battery management system, and no additional circuit is added, so that the hardware cost and weight are not increased, and the higher reliability of the system can be kept. Therefore, according to the charging method disclosed by the embodiment of the disclosure, the charging current of each battery pack can be in a safe range, and meanwhile, the charging efficiency and reliability of the battery pack are improved.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 illustrates an exemplary application scenario of a charging method according to an embodiment of the present disclosure.

Fig. 2 illustrates an exemplary flow diagram of a charging method according to an embodiment of the disclosure.

Fig. 3a illustrates a schematic diagram of an exemplary method of regulating a first requested current of each battery pack according to an embodiment of the present disclosure.

Fig. 3b shows a schematic diagram of an exemplary method of regulating the first requested current of each battery pack according to an embodiment of the present disclosure.

Fig. 4 illustrates one example of an adjustment scheme for current parameters of an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of an exemplary method for implementing a fully charged battery pack according to an embodiment of the present disclosure.

Fig. 6 illustrates an exemplary flow chart of a charging method according to an embodiment of the disclosure.

Fig. 7 shows an exemplary structural schematic diagram of a charging device according to an embodiment of the present disclosure.

Fig. 8 shows an exemplary structural schematic diagram of a charging device according to an embodiment of the present disclosure.

Fig. 9 shows a block diagram of a charging device 1900 according to an embodiment of the disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Electric aircraft use electric power instead of internal combustion engine power, making electric aircraft have many advantages and unique qualities compared to traditional internal combustion engine driven aircraft. The aircraft has the most outstanding advantages of energy conservation, environmental protection, high efficiency, low energy consumption, realization of near zero emission, very low noise and vibration level, good riding comfort and is a genuine environment-friendly aircraft. The ability to take off and land vertically makes the application scenario of an electric vertical take off and landing aircraft similar to a helicopter, eliminating the need for airports and runways. In addition, the electric vertical take-off and landing aircraft has the characteristics of safety, reliability (no fuel explosion and fuel leakage), simple structure, convenience in operation and use, good maintainability/low cost, good economy and the like. There are also many advantages in design: the overall layout is flexible, and the optimal layout and the unconventional/innovative layout can be adopted; the airplane with extraordinary performance can be designed to meet the requirements of special purposes, and the like.

In order to ensure a sufficient safety margin for the electric aircraft, the battery system of the electric aircraft is often designed to be powered by a plurality of battery packs in parallel. Each battery pack can comprise an independently controllable high-voltage relay which can be independently disconnected in the charging and discharging process, so that the battery system can still output enough power even if the battery pack has a fault.

However, in a long-term use process of a battery system composed of parallel battery packs, individual differences may exist in each battery pack, and taking the state of charge of the battery cells of the battery pack as an example, the difference between the maximum state of charge and the minimum state of charge may become gradually larger, or the impedance difference between the battery cell cells may become larger, so that the state of charge difference and the total internal resistance difference may occur between the battery packs; when the battery system starts to be charged, if the voltages applied to the battery packs are the same, the actual charging current entering each battery pack may be different from the expected charging current under the same charging voltage due to the difference of the states of charge and the internal resistances of the battery packs, and thus the charging process has a lithium precipitation risk. The charging time is indirectly extended if the charging risk is reduced by simply setting the desired charging current to the minimum allowed charging current times the number of battery packs; in addition, because there are individual differences between the battery packs, the full charge of one battery pack does not represent that all the battery packs are fully charged, and if the charging is finished after the full charge of a single battery pack, the amount of electricity that can be actually discharged will decrease, and the capacity difference between the battery packs cannot be eliminated. Therefore, how to optimize the charging technology of the battery system with multiple parallel battery packs is a problem to be solved urgently.

The charging schemes proposed in the prior art in the scenario of parallel connection of multiple battery packs are briefly described below.

The scheme of prior art one is that a plurality of battery package are directly parallelly connected, and the rethread high voltage relay is connected to high pressure disk case, and this kind of structure is applicable in electric truck etc.. However, it is difficult to ensure that the actual charging current of each battery pack is less than the maximum allowable charging current, and in a plurality of battery packs connected in parallel, charging is finished as long as one battery pack is fully charged, so that it is not ensured that all the battery packs are fully charged, and the capacity difference of different battery packs will become larger and larger if the battery packs are maintained in an incompletely charged state for a long time.

The second prior art provides a battery charging and discharging control circuit, which obtains a reference voltage signal according to the voltage drop of a multi-channel parallel battery pack and the voltage drop of a voltage regulating circuit parallel to the battery, and adjusts the voltage drop of the voltage regulating circuit on each channel according to the reference voltage signal, so that the total voltage drop on each battery channel is basically consistent, and the current of each battery channel of the parallel battery pack is balanced in the charging and discharging process. The voltage drop of the battery pack is determined based on the cell voltage of the battery cells, so the scheme is to control the charging current according to the cell voltage, but in the actual control process, the cell voltage selection of a plurality of battery packs can be changed, the charging current can be changed in the changing process, and the accuracy of the charging current is reduced; moreover, the method also fails to solve the problem of how to ensure that each battery pack is fully charged.

In the third prior art, an Insulated Gate Bipolar Transistor (IGBT) element is correspondingly disposed for each battery pack, a target charging current of the battery pack is calculated according to a maximum allowable charging current of each battery pack provided by a battery management system and a charging current of a generator set, and a traction converter is used to control an on-time of the IGBT element corresponding to each battery pack, so as to control the charging current of each battery pack. Although the charging current accuracy problem of each battery pack can be solved due to the addition of the IGBT element, on the electric aircraft, the IGBT element directly connected in series to the battery pack increases the weight of the battery system, and reduces the reliability of the battery system.

In the fourth prior art, the total charging current and the total maximum allowable charging current of all the battery packs are calculated respectively, the total charging current and the total maximum allowable charging current of all the battery packs are compared, and if the total charging current can meet the total maximum allowable charging current of all the battery packs, charging is performed according to the maximum allowable charging current of each battery pack; and if the maximum allowable charging total current of all the battery packs is not enough, distributing the charging supply total current in proportion, and charging each battery pack according to the distributed charging current. However, in an actual scenario, each battery pack has a difference between the state of charge and the internal resistance, and cannot be charged with an ideal maximum allowable charging current, and meanwhile, the scheme cannot solve the problem of how to ensure that each battery pack is fully charged.

In summary, the charging scheme proposed in the prior art under the scenario of parallel connection of multiple battery packs still has an optimization space in the aspects of reliability, charging current accuracy, charging efficiency, and the like. In view of the above, the present disclosure provides a charging method, a charging apparatus, and a storage medium, according to the charging method of the embodiments of the present disclosure, the charging current of each battery pack is within a safe range, and the charging efficiency and reliability of the battery pack are improved.

Fig. 1 illustrates an exemplary application scenario of a charging method according to an embodiment of the present disclosure. As shown in fig. 1, the charging method of the embodiment of the present disclosure is used for charging a battery system with multiple parallel battery packs, and fig. 1 illustrates that a battery pack D1, a battery pack D2, a battery pack D3, and a battery pack D4 are connected in parallel. The structure of each battery pack can be the same, and taking the battery pack D1 as an example, the battery pack D1 includes a pre-charging resistor, a fuse, a current sensor, a battery, and a first relay, a second relay, and a third relay that can be independently controlled. Wherein the first relay, the second relay and the third relay may be a main negative relay, a pre-charge relay and a main positive relay, respectively. Each battery pack corresponds to a battery pack information collecting system, for example, the battery pack D1, the battery pack D2, the battery pack D3, and the battery pack D4 may correspond to the battery pack information collecting system B1, the battery pack information collecting system B2, the battery pack information collecting system B3, and the battery pack information collecting system B4, respectively, and the battery pack information collecting system may be configured to collect information of the corresponding battery pack, for example, voltage information (for example, see charging voltage, cell voltage, and the like described below), current information (for example, see charging current and the like described below), and state information (for example, see temperature and state of charge described below), and the like. The information collection frequency of the battery pack information collection system may be set in advance, for example, to 10 ms/time. For ease of understanding, the present disclosure describes the battery pack collection system as being used only for information collection. It should be understood by those skilled in the art that the battery pack information collection system can also be used as a control system of the battery pack (for example, to control the on or off of a relay), and the present disclosure is not limited to the specific functions supported by the battery pack information collection system.

Referring to fig. 1, the plurality of battery packs connected in parallel may be further connected to a dc charger, for example, through a fourth relay and a fifth relay, where the fourth relay and the fifth relay may be fast charging relays, and when the fourth relay and the fifth relay are turned on, the dc charger may charge each battery pack. In the charging process, the dc charger may also perform charging with the battery management system through a Controller Area Network (CAN) bus based on a related charging protocol (e.g., GB/T27930-.

In the application scenario, after the information of the battery pack is acquired by the battery pack information acquisition system, the information can be sent to the battery management system, and the battery management system can execute the charging method disclosed by the invention to determine the current parameter and transmit the current parameter to the charging pile (namely, a direct current charger), so that the charging pile can provide current according to the current parameter. Alternatively, the battery management system may perform the charging method of the present disclosure for controlling the charging voltage. Through controlling the current or the voltage that fill electric pile and provide, can realize indirectly that the charging current of controlling every battery package all is in safe range to promote the charge efficiency and the reliability of battery package.

An exemplary manner of operation of the battery management system to perform the charging method is described below. Fig. 2 illustrates an exemplary flow chart of a charging method according to an embodiment of the disclosure.

As shown in fig. 2, in one possible implementation, the charging method is applied to a battery management system, the battery management system connects a plurality of battery packs connected in parallel, and the method includes steps S21-S24:

and step S21, acquiring the state information of at least one parallel battery pack.

Referring to fig. 1, when the battery management system respectively controls the internal relays of all the battery packs to be closed, and simultaneously closes the fourth relay and the fifth relay, the battery management system first acquires the state information of the battery packs. The state information may include the temperature and state of charge of the battery pack. The state information can be acquired by a battery pack information acquisition system. The battery management system can send a state information acquisition request to a plurality of battery pack information acquisition systems corresponding to a plurality of battery packs, and the battery pack information acquisition systems can send the acquired state information (including temperature and charge state) of the corresponding battery packs to the battery management system after receiving the request. Optionally, the battery pack information acquisition system may also send attribute information of the battery pack (e.g., an identifier or an ID of the battery pack, etc.) to the battery management system, so that the battery management system can determine a corresponding relationship between the received state information and the battery pack.

Step S22, obtaining a first request current of each battery pack according to the status information.

The state information of the battery pack may have an association with the first requested current, and the association may be known. The first requested current may represent an ideal value of a maximum allowable charging current of the battery pack. The implementation of obtaining the first request current of each battery pack according to the status information can refer to the following description and the related description in table 1. After the first request current of each battery pack is obtained, the current parameter can be obtained according to the obtained first request current, and the current parameter is output to the charging pile. The charging pile can provide charging current for a plurality of parallel battery packs according to the current parameters. The current value of the charging current may be equal to the value of the current parameter. Namely, the direct current charger starts to charge each battery pack.

Step S23, adjusting the first request current of each battery pack according to the charging current of each battery pack collected in real time.

The charging current can be acquired by a battery pack information acquisition system. The battery management system can send current information acquisition requests to a plurality of battery pack information acquisition systems corresponding to a plurality of battery packs, and the battery pack information acquisition systems can send acquired current information (including charging current) corresponding to the battery packs to the battery management system after receiving the requests.

The charging current of each battery pack acquired in real time is the actual charging current of each battery pack. The manner of adjusting the first request current of each battery pack according to the charging current of each battery pack collected in real time may be a closed-loop adjustment manner, and an example of this may be referred to below and the related descriptions of fig. 3a and fig. 3 b.

And step S24, updating the current parameters output to the charging pile according to the adjusted first request current of each battery pack, and providing the charging current for the plurality of parallel battery packs by the charging pile according to the current parameters.

The adjusted first request current can be used for updating the current parameter and outputting the updated current parameter to the charging pile. Correspondingly, fill electric pile and can adjust its charging current that provides for a plurality of parallelly connected battery package according to the current parameter. The current value of the adjusted charging current may be equal to the value of the updated current parameter.

According to the charging method disclosed by the embodiment of the disclosure, the current parameter is obtained firstly through the state information, then the current parameter is updated through the charging current acquired in real time, and the current parameter is not determined through the maximum cell voltage, so that the change of the maximum cell voltage has no influence on the determination of the current parameter, and the accuracy of the current parameter can be improved. The charging method provided by the embodiment of the disclosure does not always perform charging according to the current parameter obtained from the state information, but performs charging according to the current parameter which is continuously updated, so that the charging method is more suitable for practical application scenarios, and the accuracy of the current parameter can be further improved. Due to the fact that the accuracy of the current parameters is improved, the charging method can enable the charging current of each battery pack to be within a safe range, and meanwhile the charging efficiency of the battery packs is improved. The method is executed by a battery management system, and no additional circuit is added, so that the hardware cost and the weight are not increased, and the higher reliability of the system can be kept. Therefore, according to the charging method disclosed by the embodiment of the disclosure, the charging current of each battery pack can be in a safe range, and meanwhile, the charging efficiency and reliability of the battery pack are improved.

In one possible implementation, the state information includes a temperature and a state of charge of the battery pack, and the step S22 includes:

and for each battery pack, determining a first request current corresponding to the temperature and the charge state of the battery pack according to the association relation between the temperature and the charge state of the battery pack and the first request current.

For example, the first requested current of the battery pack may be associated with temperature and state of charge, and table 1 below shows an example of the relationship between the rate of the first requested current and the temperature T and the state of charge SOC of the battery pack.

TABLE 1

TABLE 1 continuation

55	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
													60	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28
65	0	0	0	0	0	0	0	0	0	0	0	0

For example, assuming that the capacity of the battery pack is 50A, when the temperature T is 0 and the state of charge SOC is 50%, and the multiplying factor of the first request current is found to be 0.15 according to table 1, the first request current may be 0.15 × 50 to 7.5A. Table 1 shows only one example of the relationship between the rate value of the first request current and the temperature and state of charge values, and the charging rate of the first request current of the battery pack may be different when the battery pack uses different cells, which is not limited by the present disclosure. Since it is determined by table lookup, the first request current obtained from the state information is also referred to as a table lookup current in some prior arts.

After the current parameters are obtained according to the first request current and sent to the charging pile, the charging pile can charge each battery pack. There will be a charging current flowing in the battery pack. If the actual value of the maximum allowable charging current of the battery pack does not exceed the ideal value of the maximum allowable charging current of the battery pack, the actual charging current of the battery pack does not exceed the first requested current. If the actual value of the maximum allowable charging current of the battery pack exceeds the desired value of the maximum allowable charging current of the battery pack, then the actual charging current of the battery pack may exceed the first requested current, requiring adjustment of the first requested current of the battery pack.

Fig. 3a and 3b respectively illustrate schematic diagrams of an exemplary method of adjusting a first request current of each battery pack according to an embodiment of the present disclosure. As shown in fig. 3a, in one possible implementation, step S23 includes:

determining a first difference i between the first request current and the charging current of each battery pack;

respectively carrying out proportional integral operation on the first difference values i to obtain first integral values Ierr;

and adjusting the first request current of each battery pack according to the magnitude relation between the first integral value Ierr and a first threshold value.

For example, as shown in fig. 3b, after the charging current and the first request current of each battery pack are obtained, the first difference value i may be determined according to the first request current and the charging current of each battery pack. The first difference value i may indicate a difference between an ideal value of a maximum allowed charging current of the battery pack and an actual charging current. The first difference values i may be subjected to proportional integral operations, respectively, to obtain first integral values Ierr. The proportional integral operation can be implemented based on the prior art. The principle of the proportional-integral operation is briefly described below.

Proportional integral operations are commonly used in proportional integral controllers, which literally may include both proportional and integral controllers. The proportional controller is the most basic and commonly applied one, and has the greatest advantage of timely and rapid control. The proportional controller can immediately generate a control action as long as a deviation is generated. However, the disadvantage of the proportional controller not being able to finally eliminate the residual error limits its individual use. The method for overcoming the residual difference is to add an integral controller on the basis of a proportional controller.

The term "integration" as used herein means "accumulation". The output of the integral controller is proportional to the integral of the input deviation over time. That is, the output of the integral controller is not only related to the magnitude of the input offset, but also to the time over which the offset exists. The output will accumulate (either larger or smaller) as long as the deviation is present, and the accumulation will not stop until the deviation is zero. Therefore, the integration control can eliminate the residual difference.

Although the integration control can eliminate the residual error due to the accumulation, it has a disadvantage of being not timely controlled. The control action produced by the method always lags behind the change of deviation, the influence of interference cannot be overcome timely and effectively, and the control system is difficult to stabilize. The integral controller and the proportional controller are combined to form the proportional-integral controller, so that the length of the integral controller and the proportional-integral controller is taken to make up for each other, and the proportional-integral controller has the advantages of rapidness and timeliness of the proportional controller and the capability of eliminating residual difference of the integral controller. Therefore, the proportional-integral controller can realize ideal process control.

Referring to fig. 3b, the proportional controller performs a proportional operation on the first difference I to obtain an operation result P, the integral operation performs an integration operation to obtain an operation result I, and the summation of the operation result I and the operation result P is used to obtain a first integral value Ierr (in the process, an upper limit and a lower limit exist in the first integral value).

A first threshold value may be preset, for example, set to 0, and the adjustment scheme of the current parameter may be determined by comparing the magnitude relationship between the first integrated value Ierr and the first threshold value. Fig. 4 illustrates one example of an adjustment scheme for current parameters of an embodiment of the present disclosure.

As shown in fig. 4, in a possible implementation manner, the adjusting the first request current of each battery pack according to the magnitude relationship between the first integrated value and the first threshold value includes:

for each battery pack, when the first integral value is larger than a first threshold value, enabling the value of the adjusted first request current to be equal to the difference between the original first request current and the first integral value;

and when the first integral value is smaller than or equal to a first threshold value, enabling the value of the adjusted first request current to be equal to the original first request current.

The current parameter includes a total requested current, and step S24 includes:

and updating the total request current to the sum of the first request currents of each battery pack after regulation.

For example, the total requested current may be an actual value of a total current that can be received by the battery system, which is determined by the battery management system, and when the battery system includes a plurality of battery packs connected in parallel, the total requested current may be a sum of actual values of maximum allowable charging currents of the respective battery packs. Therefore, the total request current can be transmitted to the charging pile as a current parameter, and when the charging pile provides charging current to the battery system (namely, a plurality of battery packs connected in parallel) according to the current value indicated by the total request current, the charging requirement of each battery pack can be met.

For each battery pack, it may be considered that when the first integrated value Ierr is greater than a first threshold value (e.g. 0), the actual charging current of the battery pack exceeds the actual value of the maximum allowable charging current, and there may be a risk of lithium deposition if charging continues according to the primary current parameter. Therefore, the first request current may be adjusted such that the value of the adjusted first request current is equal to the difference between the original first request current and the first integrated value Ierr. Since the value of the adjusted first request current decreases and the decreased portion is the first integrated value Ierr, the possibility that the risk of lithium deposition occurs in the current parameter updated with the adjusted first request current is greatly reduced.

Accordingly, it can be considered that when the first integrated value Ierr is less than or equal to the first threshold (e.g. 0), the actual charging current of the battery pack does not exceed the actual value of the maximum allowable charging current, and there is no risk of lithium precipitation for the battery pack when charging according to the primary current parameter. Therefore, the adjusted first request current can be made equal in value to the original first request current. If the first request current of all the battery packs is not adjusted, it can be considered that there is no risk of lithium precipitation for all the battery packs when the battery packs are charged according to the original current parameters. The updated current parameter may be substantially the same value as the original current parameter.

It will be appreciated by those skilled in the art that the first threshold may be set to other values, and the disclosure is not limited thereto.

In this way, regulation of the first requested current may be achieved. And respectively carrying out proportional-integral operation on each battery pack to realize control of the first request current, so that the total request current to the charging pile is adjusted in real time, and the first integral values of all the battery packs can be ensured to approach to a first threshold value. Therefore, the battery management system executes the charging method, so that when the battery packs are in any charge state and temperature, the actual charging current of all the battery packs does not exceed the first request current, and meanwhile, the charging current of the battery system in the state is ensured to be the maximum, namely, higher charging efficiency is ensured.

Another exemplary method of adjusting the first requested current and the current parameter of each battery pack according to the disclosed embodiments is described below.

In one possible implementation, step S23 includes:

adjusting the first request current such that the first integrated value Ierr is less than or equal to a second threshold value for each battery pack.

and updating the total request current to the minimum first request current in the regulated first request currents.

For example, the first integrated value Ierr is a result of proportional-integral operation of the first request current and the first difference i of the charging current, and a second threshold value may be set so that the second threshold value is associated with the first request current of each battery pack, for example, so that the second threshold value is equal to the sum of the first request currents of each battery pack ×. 1.2. In this case, it is also possible to achieve that the charging current of the battery pack does not exceed the first requested current by controlling the first requested current so that the first integrated value Ierr remains less than or equal to the second threshold value. It should be noted that, in this scheme, after a certain battery pack is fully charged, the value of the minimum first request current may be changed greatly, and in order to avoid a sudden increase of the charging current, when the value of the minimum first request current is changed, the upward change rate of the total request current may be controlled, for example, controlled to be smaller than a preset third threshold.

It will be understood by those skilled in the art that the second threshold may be set to other values, for example, to the sum of the first request currents of the battery packs multiplied by other multiples, and the disclosure is not limited thereto. Other ways of controlling the rate of upward change of the total requested current are possible, and the disclosure is not limited thereto.

In this way, the manner of adjusting the first request current of each battery pack and the manner of updating the current parameters can be made more flexible.

During charging of the battery system, the battery management system may select a minimum state of charge of the states of charge of the plurality of battery packs as the state of charge of the battery system. After any battery pack is fully charged, other battery packs that are not fully charged should continue to be charged until all battery packs are fully charged. Fig. 5 shows a schematic diagram of an exemplary method for implementing a fully charged battery pack for an embodiment of the present disclosure.

As shown in fig. 5, in one possible implementation, the method further includes:

acquiring the monomer voltage of each battery monomer of each battery pack;

judging whether each battery pack meets a preset condition, wherein the preset condition comprises that the maximum monomer voltage in the monomer voltages of the battery monomers of the battery pack reaches a cut-off voltage corresponding to the battery pack;

controlling a relay in the battery pack meeting the preset condition to be switched off, and adjusting the state of charge of the battery pack meeting the preset condition to a maximum value;

step S24, including:

and updating the current parameter according to the sum of the adjusted first request currents of the battery packs which do not meet the preset condition.

For example, the cell voltage may be acquired by a battery pack information acquisition system. The battery management system can send voltage information acquisition requests to a plurality of battery pack information acquisition systems corresponding to a plurality of battery packs, and after receiving the requests, the battery pack information acquisition systems can send the acquired voltage information (including the monomer voltage of each battery cell of the corresponding battery pack) of the corresponding battery pack to the battery management system.

According to the obtained single voltage of each battery pack, the battery management system can judge whether each battery pack meets a preset condition. The preset condition may be, for example, that the maximum cell voltage among the cell voltages of the battery cells of the battery pack reaches a cut-off voltage corresponding to the battery pack. If any battery pack meets the preset condition, a certain battery cell of the battery pack can be considered to be fully charged, and the battery pack can not be charged any more. On the contrary, if any battery pack does not meet the preset condition, all the battery cells of the battery pack are considered to be not fully charged, and the battery pack can be continuously charged.

Since the number of the rechargeable battery packs may vary, and the rechargeable battery packs may receive a corresponding variation in the charging current, the current parameter needs to be updated. In step S24, the current parameter may be updated according to the sum of the adjusted first request currents of the battery packs that do not satisfy the preset condition. In this case, the current parameter is determined from the adjusted first request current of the battery pack that can be charged, and therefore the accuracy is higher.

Because the battery pack does not need to be charged again, the battery management system can control the relay in the battery pack meeting the preset condition to be switched off, and the current output by the direct current charger can not be input into the battery pack meeting the preset condition. Meanwhile, the battery management system can adjust the state of charge value of the battery pack meeting the preset condition in the acquired state information to the maximum value. Here, "adjustment" may mean state information obtained by the battery management system adjustment. The state information collected by the battery pack information collection system and stored in the battery pack information collection system can be adjusted. In the charging process, after the battery management system adjusts the state of charge of a certain battery pack to reach the maximum value, if the state of charge information of the battery pack needs to be used subsequently, the state of charge of the battery pack can be directly determined to be the maximum value, a temperature information acquisition request is sent to a corresponding battery pack information acquisition system, and the battery pack information acquisition system only needs to acquire and transmit temperature information according to the request. After the charging is finished, the state information of each battery pack is based on the numerical value acquired in real time. Referring to table 1, it can be seen that under the same temperature condition, the larger the state of charge value is, the smaller the multiplying factor of the first request current is, and therefore, the smaller the first request current is, so that the influence of the battery pack meeting the condition on the current parameter is also smaller.

Furthermore, the current parameters can be updated first, and then the relays of the battery packs meeting the conditions are switched off, so that the increase rate of the actual charging current of the battery packs not meeting the conditions is reduced, and the charging safety is improved. When the maximum cell voltage of the battery cells of each battery pack reaches the cut-off voltage corresponding to each battery pack, all the battery packs can be considered to be fully charged, the battery management system can not send current parameters to the charging pile any more, the fourth relay and the fifth relay can be controlled to be disconnected, and the state of charge of the battery system is adjusted to be 100% of the maximum value.

By the mode, the plurality of battery packs can be charged fully in sequence, charging can be finished after all the battery packs are charged fully, and the capacity difference of the battery packs can be reduced.

In the above, the battery management system executes the charging method, and the control of the first request current, and thus the control of the current parameter, is implemented by proportional-integral operation as an example. The control of the charging current may also be performed in other ways than the above-described method.

As shown in fig. 6, the present disclosure proposes a charging method applied to a battery management system that connects a plurality of parallel battery packs, the method including steps S61-S65:

step S61, determining the cut-off voltage of each battery cell of at least one parallel battery pack;

step S62, obtaining the charging current of each battery pack and the cell voltage of each battery cell in each battery pack;

step S63, carrying out first proportional integral operation on the difference value between the cut-off voltage corresponding to the maximum monomer voltage and the maximum monomer voltage to obtain a third integral value;

step S64, performing a second proportional integral operation according to the third integral value and the current value of the charging current of the battery pack corresponding to the maximum cell voltage to obtain a fourth integral value;

and step S65, controlling the charging voltage of each battery pack according to the fourth integrated value so that the charging voltage of each battery pack is equal to the difference between the cut-off voltage corresponding to the maximum cell voltage and the fourth integrated value.

For example, in step S61, the battery management system may first determine the cut-off voltage of each battery cell of at least one parallel battery pack. The cutoff voltage may indicate a desired value of a maximum allowable charging voltage of the battery cell. The cutoff voltage may be preset according to demand or battery properties.

In step S62, the charging current and the cell voltage may be acquired by the battery pack information acquisition system. The battery management system can send current information acquisition requests and voltage information acquisition requests to a plurality of battery pack information acquisition systems corresponding to a plurality of battery packs, and after receiving the requests, the battery pack information acquisition systems can send acquired current information (including charging current of the corresponding battery pack) and voltage information (including monomer voltage of each battery cell of the corresponding battery pack) of the corresponding battery pack to the battery management system.

The cell voltage of each battery cell in each battery pack acquired by the battery management system may indicate an actual charging voltage of the battery cell. It can be understood that, due to the influence of the temperature, the state of charge, and other factors of the battery pack, the ideal value of the maximum allowable charging voltage and the actual value of the maximum allowable charging voltage may be different, and when the actual charging voltage of the battery cell is less than or equal to the actual value of the maximum allowable charging voltage, the charging safety may be ensured, and the charging efficiency may be maximized. Based on the above, the control of the actual charging voltage of the battery cell can be realized by adopting a closed-loop regulation mode in the prior art, such as proportional-integral operation.

For example, in step S63, a first proportional-integral operation may be performed on a difference between the cut-off voltage corresponding to the maximum cell voltage and the maximum cell voltage among the obtained cell voltages to obtain a third integral value. In step S64, a second proportional-integral operation is performed based on the third integrated value and the current value of the charging current of the battery pack corresponding to the maximum cell voltage, and a fourth integrated value is obtained. The proportional-integral operation can be performed by referring to the above example and the example of fig. 3b, and is not described herein again.

The charging voltage of each battery pack may be controlled according to the fourth integrated value. The fourth integrated value may indicate a difference between the actual value of the maximum allowable charging voltage and the ideal value of the maximum allowable charging voltage, and therefore, in step S65, it is only necessary to control the charging voltage of each battery pack so as to be equal to the difference between the cutoff voltage (the ideal value indicating the maximum allowable charging voltage) and the fourth integrated value. When the charging voltage of each battery pack is equal to the actual value of the maximum allowable charging voltage, it is considered that the charging current reaches the maximum value without exceeding the actual value of the maximum allowable charging current of the battery pack, and therefore, it is equivalent to the control of the charging current by the control of the charging voltage.

According to the charging method provided by the embodiment of the application, the cut-off voltage of the battery cell is determined, and then the charging voltage is controlled through proportional-integral operation, so that the control of the charging current can be indirectly realized. In the primary control process aiming at the charging voltage, only the corresponding maximum monomer voltage needs to be selected, and proportional-integral operation is carried out for two times, so that the charging method can reduce the proportional-integral operation times and reduce the data processing cost. And therefore the control of the charging voltage has higher stability than the scheme of directly regulating the current. Therefore, the charging method disclosed by the embodiment of the disclosure can enable the charging current of each battery pack to be within a safe range, and meanwhile, the charging efficiency of the battery pack is improved. The method is executed by a battery management system, and no additional circuit is added, so that the hardware cost and weight are not increased, and the higher reliability of the system can be kept. Therefore, according to the charging method disclosed by the embodiment of the disclosure, the charging current of each battery pack can be in a safe range, and meanwhile, the charging efficiency and reliability of the battery pack are improved.

In one possible implementation, the method further includes:

updating the current parameter according to the sum of the first request currents of the battery packs which do not meet the preset condition;

and controlling the relay in the battery pack meeting the preset condition to be switched off, and adjusting the state of charge of the battery pack meeting the preset condition to the maximum value.

For example, when charging is performed according to the charging method shown in fig. 6, the battery management system may determine whether each battery pack satisfies a preset condition according to the obtained cell voltage of each battery cell of each battery pack. The preset condition may be, for example, that the maximum cell voltage among the cell voltages of the battery cells of the battery pack reaches a cut-off voltage corresponding to the battery pack. If any battery pack meets the preset condition, a certain battery cell of the battery pack can be considered to be fully charged, and the battery pack can not be charged any more. On the contrary, if any battery pack does not meet the preset condition, all the battery cells of the battery pack are considered to be not fully charged, and the battery pack can be continuously charged.

Since the number of the rechargeable battery packs may vary, which causes the rechargeable battery packs to receive a corresponding variation of the charging current, the current parameter needs to be updated at this time. For example, the current parameter may be updated according to the sum of the adjusted first request currents of the battery packs that do not satisfy the preset condition. In this case, the current parameter is determined from the adjusted first request current of the battery pack that can be charged, and therefore the accuracy is higher.

Because the battery pack does not need to be charged again, the battery management system can control the relay in the battery pack meeting the preset condition to be switched off, and the current output by the direct current charger can not be input into the battery pack meeting the preset condition. Meanwhile, the battery management system can control the state of charge value of the battery pack meeting the preset condition to be adjusted to the maximum value. For an exemplary manner, see the above description and the related description of fig. 5, which is not repeated herein.

The present disclosure also provides a charging device, and fig. 7 shows an exemplary structural schematic diagram of the charging device according to an embodiment of the present disclosure. The device is applied to a battery management system which is connected with a plurality of parallel battery packs, and as shown in fig. 7, the device comprises: a first obtaining module 71, configured to obtain status information of at least one parallel battery pack; a second obtaining module 72, configured to obtain a first request current of each battery pack according to the state information; the first adjusting module 73 is configured to adjust the first request current of each battery pack according to the charging current of each battery pack collected in real time; and a first updating module 74, configured to update a current parameter output to a charging pile according to the adjusted first request current of each battery pack, where the charging pile provides the charging current for the plurality of battery packs connected in parallel according to the current parameter.

In a possible implementation manner, the updating the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes: and updating the total request current into the sum of the adjusted first request currents of each battery pack.

In one possible implementation, the apparatus further includes: the third acquisition module is used for acquiring the single voltage of each battery cell of each battery pack; the first judgment module is used for judging whether each battery pack meets preset conditions or not, wherein the preset conditions comprise that the maximum single voltage in the single voltages of the battery monomers of the battery pack reaches a cut-off voltage corresponding to the battery pack; the first control module is used for controlling the relay in the battery pack meeting the preset condition to be switched off and adjusting the state of charge of the battery pack meeting the preset condition to the maximum value; the updating of the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes: and updating the current parameter according to the sum of the adjusted first request currents of the battery packs which do not meet the preset condition.

Fig. 8 shows an exemplary structural schematic diagram of a charging device according to an embodiment of the present disclosure. The device is applied to a battery management system, the battery management system is connected with a plurality of parallel battery packs, as shown in fig. 8, the device comprises: the first determining module 81 is used for determining the cut-off voltage of each battery cell of at least one parallel battery pack; a fourth obtaining module 82, configured to obtain a charging current of each battery pack and a cell voltage of each battery cell in each battery pack; the first operation module 83 is configured to perform a first proportional-integral operation on a difference between a cut-off voltage corresponding to a maximum cell voltage and the maximum cell voltage to obtain a third integral value; the second operation module 84 is configured to perform a second proportional-integral operation according to the third integral value and a current value of the charging current of the battery pack corresponding to the maximum cell voltage to obtain a fourth integral value; and a second control module 85, configured to control the charging voltage of each battery pack according to the fourth integrated value, so that the charging voltage of each battery pack is equal to a difference between a cut-off voltage corresponding to a maximum cell voltage and the fourth integrated value.

In one possible implementation, the apparatus further includes: the second judgment module is used for judging whether each battery pack meets preset conditions or not, wherein the preset conditions comprise that the maximum single voltage in the single voltages of the battery monomers of the battery pack reaches a cut-off voltage corresponding to the battery pack; the second updating module is used for updating the current parameter according to the sum of the first request currents of the battery packs which do not meet the preset condition; and the third control module is used for controlling the relay in the battery pack meeting the preset condition to be switched off and adjusting the state of charge of the battery pack meeting the preset condition to the maximum value.

In some embodiments, functions of or modules included in the apparatus provided in the embodiments of the present disclosure may be used to execute the method described in the above method embodiments, and specific implementation thereof may refer to the description of the above method embodiments, and for brevity, will not be described again here.

Embodiments of the present disclosure also provide a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-mentioned method. The computer readable storage medium may be a volatile or non-volatile computer readable storage medium.

The embodiment of the present disclosure further provides a charging device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the above-described method when executing the memory-stored instructions.

The disclosed embodiments also provide a computer program product comprising computer readable code or a non-transitory computer readable storage medium carrying computer readable code, which when run in a processor of an electronic device, the processor in the electronic device performs the above method.

Fig. 9 shows a block diagram of a charging device 1900 according to an embodiment of the disclosure. For example, the charging apparatus 1900 may be provided as a server or a terminal device. Referring to fig. 9, charging device 1900 includes a processing component 1922 further including one or more processors and memory resources, represented by memory 1932, for storing instructions, e.g., applications, executable by processing component 1922. The application programs stored in memory 1932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 1922 is configured to execute instructions to perform the above-described method.

The charging device 1900 may also include a power supply component 1926 configured to perform power management of the charging device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input/output (I/O) interface 1958. The charging device 1900 may operate based on an operating system stored in memory 1932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

In an exemplary embodiment, a non-volatile computer-readable storage medium, such as the memory 1932, is also provided that includes computer program instructions that are executable by the processing component 1922 of the charging device 1900 to perform the above-described methods.

The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.

The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as punch cards or in-groove raised structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.

The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.

The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).

Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A charging method applied to a battery management system that connects a plurality of parallel battery packs, the method comprising:

acquiring state information of at least one parallel battery pack;

obtaining a first request current of each battery pack according to the state information;

adjusting the first request current of each battery pack according to the charging current of each battery pack acquired in real time;

and updating the current parameters output to a charging pile according to the adjusted first request current of each battery pack, wherein the charging pile provides the charging current for the plurality of parallel battery packs according to the current parameters.

2. The method of claim 1, wherein adjusting the first requested current for each battery pack according to the charging current collected in real time for each battery pack comprises:

determining a first difference value between the first request current and the charging current of each battery pack;

respectively carrying out proportional integral operation on the first difference values to obtain first integral values;

and adjusting the first request current of each battery pack according to the magnitude relation between the first integral value and the first threshold value.

3. The method of claim 2, wherein adjusting the first requested current of each battery pack according to the magnitude relationship between the first integral value and the first threshold value comprises:

4. The method of claim 2 or 3, wherein the current parameter comprises a total requested current, and the updating the current parameter output to the charging pile according to the adjusted first requested current of each battery pack comprises:

5. The method of claim 2, wherein adjusting the first requested current of each battery pack according to the magnitude relationship between the first integral value and the first threshold value comprises:

for each battery pack, the first request current is adjusted so that the first integration value is less than or equal to a second threshold value.

6. The method of claim 5, wherein the current parameter comprises a total requested current, and the updating the current parameter output to the charging post according to the adjusted first requested current of each battery pack comprises:

7. The method according to any one of claims 1-6, wherein the state information comprises a temperature and a state of charge of the battery pack, and wherein obtaining the first requested current for each battery pack according to the state information comprises:

8. The method according to any one of claims 1-7, further comprising:

acquiring the monomer voltage of each battery monomer of each battery pack;

the updating of the current parameter output to the charging pile according to the adjusted first request current of each battery pack includes:

9. A charging method applied to a battery management system that connects a plurality of parallel battery packs, the method comprising:

determining the cut-off voltage of each battery cell of at least one parallel battery pack;

acquiring the charging current of each battery pack and the single voltage of each battery in each battery pack;

performing first proportional integral operation on a difference value between a cut-off voltage corresponding to the maximum monomer voltage and the maximum monomer voltage to obtain a third integral value;

performing a second proportional integral operation according to the third integral value and the current value of the charging current of the battery pack corresponding to the maximum cell voltage to obtain a fourth integral value;

and controlling the charging voltage of each battery pack according to the fourth integrated value, so that the charging voltage of each battery pack is equal to the difference between the cut-off voltage corresponding to the maximum cell voltage and the fourth integrated value.

10. The method of claim 9, further comprising:

11. A charging device, comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to implement the method of any one of claims 1 to 8, or to implement the method of claim 9 or 10, when executing the memory-stored instructions.

12. A non-transitory computer readable storage medium having stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, implement the method of any one of claims 1 to 8, or implement the method of claim 9 or 10.