WO2024060387A1 - Parallelized charging method for multiple battery packs, and power distribution device and readable medium - Google Patents

Abstract

A parallelized charging method for multiple battery packs, which method comprises: in each current adjustment period, acquiring the difference between a required charging current value of each battery pack and a parallelized charging current value to obtain a difference set; determining the minimum difference in the difference set as a target difference; updating, on the basis of the target difference, a requested parallelized current value corresponding to the previous current adjustment period to obtain a requested parallelized current value corresponding to the present current adjustment period; and sending the requested parallelized current value to a power supply, so that the power supply outputs an electrical signal, which has the requested parallelized current value, to charge a plurality of battery packs.

Description

Multiple battery pack parallel charging method, power distribution equipment and readable medium

Cross-references to related applications

This application requests the priority of the Chinese patent application submitted to the China Patent Office on September 20, 2022, with the application number 202211143278.5 and the invention title "Multiple battery pack parallel charging method, device, power distribution equipment and readable medium", The entire contents of which are incorporated herein by reference.

Technical field

The present application belongs to the field of battery charging control technology, and specifically relates to a multi-battery pack parallel charging method, power distribution equipment and readable medium.

Background technique

The statements herein merely provide background information relevant to the present application and do not necessarily constitute exemplary techniques.

In some related parallel charging schemes for multiple battery packs, the demand current value of each battery pack is usually determined first, and the charging current is requested from the power source based on the sum of the demand current values of all battery packs. However, when the power supply provides charging current to multiple battery packs in parallel, the actual current allocated to each battery pack cannot match the required current value of the battery pack, resulting in the actual charging current of the battery pack being greater than the required current. situation, there are major safety risks.

It should be noted that the information disclosed in the above background section is only used to enhance understanding of the background of the present application, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art.

Contents of the invention

According to various embodiments of the present application, a multi-battery pack parallel charging method, power distribution equipment and readable medium are provided.

According to one aspect of the embodiment of the present application, a parallel charging method for multiple battery packs is provided, and the method includes:

In each current adjustment cycle, obtain the difference between the required charging current value and the parallel charging current value of each battery pack to obtain a set of differences;

Determine the difference with the smallest value in the difference set as the target difference;

Update the parallel machine request current value corresponding to the previous current adjustment period based on the target difference value to obtain the parallel machine request current value corresponding to the current current adjustment period;

The parallel request current value is sent to a power source, so that the power source outputs an electrical signal having the parallel request current value to charge the plurality of battery packs.

According to one aspect of the embodiment of the present application, a multi-battery pack parallel charging device is provided, and the device includes:

A difference set acquisition unit configured to obtain the difference between the required charging current value and the parallel charging current value of each battery pack in each current adjustment period to obtain a difference set;

A target difference determination unit configured to determine the difference with the smallest value in the difference set as the target difference;

The requested current value determination unit is configured to update the parallel machine request current value corresponding to the previous current adjustment period based on the target difference value, and obtain the parallel machine request current value corresponding to the current current adjustment period;

The request current value sending unit is configured to send the parallel request current value to the power supply, so that the power supply outputs an electrical signal with the parallel request current value to charge a plurality of the battery packs.

According to an aspect of an embodiment of the present application, a power distribution device is provided. The power distribution device includes: a power connection port, a power supply port, and a controller; the power supply port is configured to connect to a battery pack; and the controller is configured to: in each During the current adjustment period, the difference between the demand charging current value and the parallel charging current value of each battery pack is obtained to obtain a difference set; the difference with the smallest value in the difference set is determined as the target difference; based on The target difference updates the parallel request current value corresponding to the previous current adjustment period to obtain the parallel request current value corresponding to the current current adjustment period; sends the parallel request current value to the power supply, so that the power supply An electrical signal having the parallel request current value is output to charge a plurality of battery packs.

According to one aspect of an embodiment of the present application, a computer-readable medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the multi-battery pack parallel charging method in the above technical solution is implemented.

According to an aspect of an embodiment of the present application, a computer program product or computer program is provided, the computer program product or computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the multi-battery pack parallel charging method in the above technical solution.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the application will become apparent from the description, drawings and claims.

Description of 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. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 schematically shows a flow chart of the steps of a parallel charging method for multiple battery packs provided by an embodiment of the present application.

FIG. 2 schematically shows a schematic curve diagram for adjusting the charging current of a single battery pack according to an embodiment of the present application.

Figure 3 schematically shows a specific flow chart for implementing step S103 in an embodiment of the present application.

Figure 4 schematically shows a specific flow chart for implementing step S104 in an embodiment of the present application.

Figure 5 schematically shows a specific flow chart for implementing step S104 in another embodiment of the present application.

Figure 6 schematically shows a specific flow chart for implementing step S104 in yet another embodiment of the present application.

Figure 7 schematically shows a structural block diagram of a power distribution device in an embodiment of the present application.

FIG. 8A schematically shows a usage scenario of power distribution equipment in an embodiment of the present application.

Figure 8B schematically shows a structural block diagram of an energy storage device in another embodiment of the present application.

Figure 9 schematically shows a structural block diagram of a multi-battery pack parallel charging device provided by an embodiment of the present application.

FIG. 10 schematically shows a structural block diagram of a computer system suitable for implementing a power distribution device according to an embodiment of the present application.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

Furthermore, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known methods, apparatus, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present application.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and/or processor devices and/or microcontroller devices. entity.

The flowcharts shown in the drawings are only illustrative, and do not necessarily include all contents and operations/steps, nor must they be performed in the order described. For example, some operations/steps can be decomposed, and some operations/steps can be merged or partially merged, so the actual order of execution may change according to the actual situation.

The multi-battery pack parallel charging method, device, power distribution equipment and readable medium provided in this application will be described in detail below in conjunction with specific implementations.

Referring to Figure 1, Figure 1 schematically shows a flow chart of the steps of a parallel charging method for multiple battery packs provided by an embodiment of the present application. The execution subject of the multi-battery pack parallel charging method may be an energy storage device with multiple battery packs, specifically a controller in the energy storage device. Or power distribution equipment, specifically a controller in the power distribution equipment. As shown in Figure 1, taking the multi-battery pack parallel charging method provided in this embodiment applied to power distribution equipment as an example, the method includes the following steps S101 to S104.

Step S101: In each current adjustment period, obtain the difference between the required charging current value and the parallel charging current value of each battery pack to obtain a set of differences.

In step S101, the required charging current value refers to the current value of the charging current expected by each battery pack during the charging process. Among them, different battery packs may be set with the same or different required charging current values.

The parallel charging current value refers to the actual charging current value of a single battery pack under the condition of parallel charging of multiple battery packs. Among them, different battery packs may be assigned the same size or different sizes of parallel charging current due to battery pack parameters such as internal resistance of the battery pack. That is to say, the parallel charging current values corresponding to different battery packs may be the same value, or they may be different values.

In each current adjustment cycle, the controller can calculate the demand charging current value and parallel charging current of each battery pack based on the demand charging current value corresponding to each battery pack and the parallel charging current value corresponding to each battery pack. The difference in values, as an element in the difference collection.

It should be noted that the parallel charging of multiple battery packs can refer to the parallel charging of multiple energy storage devices equipped with battery packs, or it can also be the parallel charging of multiple battery packs in the same energy storage device, which is not discussed here. limit. When multiple energy storage devices are charged in parallel, the battery management systems of multiple energy storage devices can determine the main battery management system according to the preset selection strategy for communicating with electrical equipment or power sources.

In specific implementation, the difference between the required charging current value of each battery pack and the parallel charging current value can be obtained by the main battery management system obtaining the required charging current value of each battery pack when multiple battery packs are paralleled. , and sends the required charging current value of each battery pack to the power distribution equipment. The power distribution equipment sends a charging request to the power supply according to the required charging current value of each battery pack, and when the power supply provides a charging signal according to the charging request, When multiple battery packs are connected in parallel, the power distribution equipment can obtain the parallel charging current value of each battery pack, and then obtain the difference between the required charging current value of the battery pack and the parallel charging current value, that is, a set of differences is obtained.

It can be understood that in other embodiments where the execution subject is an energy storage device, the battery management system in the energy storage device can serve as the main battery management system. The main battery management system obtains the required charging current value of each battery pack, and sends a charging request to the power supply according to the required charging current value of each battery pack, and when the power supply provides charging electrical signals for multiple battery packs based on the charging request During parallel operation, the energy storage device can obtain the parallel charging current value of each battery pack, and then obtain the difference between the required charging current value of the battery pack and the parallel charging current value, that is, a set of differences is obtained.

Step S102: Determine the difference with the smallest value in the difference set as the target difference.

It should be noted that in actual applications, since the internal resistance of multiple battery packs may be different, when the same charging device charges each battery pack, the actual charging current value obtained by each battery pack may be the same. Or not the same. Therefore, when calculating the difference between the required charging current value and the actual charging current of each battery pack, multiple differences will be obtained, and the set of all differences will be regarded as the difference set.

For example, taking three battery packs 1, 2, and 3 as examples, obtain the required charging current value and parallel charging current value of each battery pack respectively. Assume that the required charging current of battery pack 1 is 50A, and the parallel charging current value is 25A, the required charging current of battery pack 2 is 50A, and the parallel charging current value is 15A, and the required charging current of battery pack 3 is 50A, and the parallel charging current value is 10A. Calculate the difference between the required charging current value and the parallel charging current value of each battery pack respectively. The differences of the three battery packs are 25, 35, and 40 respectively. Summarize all the differences to obtain the difference set {25, 35, 40}. Select the smallest difference from the difference set {25, 35, 40} as the target difference, and you can get 25 as the target difference.

It is easy to understand that since the actual charging current value of the battery pack is uncertain in practical applications, the difference with the smallest value in the difference set corresponding to the cycle is selected as the target difference in each current adjustment cycle, and the parallel request current value corresponding to the current current adjustment cycle is determined based on the target difference. This can avoid the phenomenon that the parallel request current value does not match the current battery adjustment cycle when the actual charging current value of the battery pack changes, and can further ensure the safety and reliability of parallel charging of multiple battery packs.

Step S103: Update the parallel machine request current value corresponding to the previous current adjustment period based on the target difference value to obtain the parallel machine request current value corresponding to the current current adjustment period.

Specifically, the previous current adjustment period refers to the previous current adjustment period of the current current adjustment period, and a parallel machine request charging current is determined to be obtained in the previous current adjustment period.

In this embodiment, the parallel request current value corresponding to the current current adjustment period is related to the parallel request current value and the target difference determined in the previous current adjustment period.

It should be noted that based on the target difference and the parallel request current value determined in the previous current adjustment period, the parallel request current value corresponding to the current current adjustment period is determined in order to use the parallel request current obtained in the previous current adjustment period. The difference between the value and the target makes it closer to the required charging current value of each battery pack in the current adjustment period after each current adjustment period, so that the parallel request current value corresponding to each current adjustment period has a strong continuity and better applicability. In addition, since the difference between the parallel machine request current value and the target value determined by different current adjustment periods changes with the change of the difference value set, it can also be ensured that the charging current provided by the power supply does not change during each current adjustment period. This will cause the actual charging current value of a single battery pack to be greater than its required charging current value.

As an example, when determining the parallel request current value corresponding to the current current adjustment period, the target difference value and the parallel request current value determined in the previous current adjustment period can be substituted into a preset formula, so that the current current can be calculated Adjust the parallel request charging current corresponding to the adjustment period.

Specifically, the preset formula satisfies: send_chg_amp=send_chg_amp_P+kp*error_value, where send_chg_amp is the parallel request current value corresponding to the current current adjustment period, send_chg_amp_P is the parallel request current value determined in the previous current adjustment period, and error_value is the target. The difference value, kp, is the first preset proportional coefficient. The first preset proportional coefficient can be set according to the actual situation and is not limited here.

It can be understood that during specific implementation, other adjustment strategies or other calculation strategies can also be used, for example, configuring the PI adjustment method, PI regulator, etc., and determining the parallel machine request current value based on the target difference and the previous current adjustment period. , determine the parallel request current value corresponding to the current current adjustment period, which will not be described again here.

In order to facilitate understanding of the difference between parallel charging of multiple battery packs and charging of a single battery pack, the charging process of a single battery pack will be described below. Refer to Figure 2, which schematically shows the charging process provided by an embodiment of the present application. Schematic diagram of the charging current adjustment curve for a single battery pack. Among them, the line segment need_chg_amp is the required charging current value of the battery pack, the curve real_chg_amp is the change curve of the actual charging current value of the battery pack, and the curve send_chg_amp is the change curve of the current value requested from the power supply.

When the battery pack's required charging current value need_chg_amp is greater than or equal to the actual charging current value real_chg_amp of the battery pack, the current value send_chg_amp requested from the power supply is a constant value, and the battery pack is continuously charged according to this current value. The actual charging current of the battery pack The value continues to increase; when the actual charging current value real_chg_amp of the battery pack is greater than the battery pack demand charging current value need_chg_amp (for example, point P in Figure 2), the current value send_chg_amp requested from the power supply begins to be adjusted. By continuously adjusting the output direction The current value requested by the power supply is send_chg_amp, so that the final actual charging current value of the battery pack is stabilized within a certain range of the battery pack's required charging current value.

Among them, in the process of continuously adjusting the current value send_chg_amp requested by the output from the power supply, by obtaining the demand charging current value and the actual charging current value corresponding to the current adjustment cycle of the battery pack, the difference between the demand charging current value and the actual charging current value is calculated value, you can get the difference error_value. It should be noted that during this process, the battery pack’s charging current value need_chg_amp remains unchanged. Substituting the difference into the preset formula, the requested current sent to the power supply can be calculated.

Among them, the preset formula is: send_chg_amp=send_chg_amp_P+kp*error_value, send_chg_amp is the request current value sent to the power supply in the current adjustment period, send_chg_amp_P is the request current value sent to the power supply in the previous adjustment period, kp is the first preset proportion coefficient , error_value is the difference between the demand charging current value corresponding to the current adjustment period and the actual charging current value. In addition, in the initial state, the requested current value sent to the power supply during the last adjustment cycle is 0. In this way, by substituting the difference value and the requested current value sent to the power supply in the previous adjustment period into the preset formula, the demand charging current value corresponding to the current adjustment period of the battery pack can be obtained. Then use the requested current value to request charging from the power supply, reacquire the current required charging current value and the actual charging current value of the battery pack, and calculate the difference between the two. The recalculated difference and the previous adjustment cycle The requested current value sent to the power supply is substituted into the preset formula, and the required charging current value corresponding to the current adjustment cycle of the new battery pack is obtained. The adjustment process is cycled in sequence, and the request current value sent to the power supply is continuously adjusted, so that real_chg_amp is finally stabilized around need_chg_amp to achieve stable charging of the battery pack.

The difference between the parallel charging process of multiple battery packs and the charging process of a single battery pack is that when multiple battery packs are charged in parallel, the current value send_chg_amp requested from the power supply by the multiple battery packs in parallel is always in a dynamically changing process. Based on the target difference and the parallel request current value determined in the previous current adjustment period, the parallel request current value corresponding to the current current adjustment period can be determined.

Step S104: Send a parallel request current value to the power supply, so that the power supply outputs an electrical signal with a parallel request current value to charge multiple battery packs.

In step S104, the power supply generally refers to the power supply used to provide electrical signals to the power distribution equipment. The power distribution equipment sends the parallel request current value to the power supply, instructs the power supply to output an electrical signal with the parallel request current value, and the power distribution equipment charges the multi-battery pack according to the electrical signal. Here, the parallel machine request current value is the parallel machine request current value corresponding to the current current adjustment period. Since the parallel request current value corresponding to the current current adjustment period is updated using the target difference based on the parallel request current value corresponding to the previous current adjustment period, the parallel request corresponding to the current current adjustment period There is an inheritance relationship between the current value and the parallel machine request current value corresponding to the previous current adjustment cycle. Based on this inheritance relationship, the charging current provided by the power supply can be instructed to be closer to the required charging current value of each battery pack after each current adjustment cycle without exceeding the required current value of each battery pack. This ensures that multiple While ensuring the safety and reliability of parallel charging of battery packs, it also greatly improves the efficiency of parallel charging of multiple battery packs.

In this embodiment, the power supply may be a power supply that outputs direct current and/or alternating current, or may be a power supply differentiated by different power generation methods, such as a solar power generation system, a wind power generation system, an oil-driven generator, etc.

It is easy to understand that the power distribution equipment can provide a basis for integrating electrical signals from different types of power sources by setting up AC/DC conversion circuits and DC/DC conversion circuits, and outputting applicable charging electrical signals for battery pack charging.

It can be understood that since the method provided in this application can also be executed by an energy storage device, in other embodiments in which the execution subject is an energy storage device, the power supply can also be directly connected to the energy storage device and used to provide power. Signal to the power source of the energy storage device. The energy storage device sends the parallel request current value to the power supply, instructing the power supply to output an electrical signal with the parallel request current value, and the energy storage device charges the multi-battery pack based on the electrical signal. Correspondingly, energy storage equipment can also provide a basis for integrating electrical signals from different types of power sources by setting up AC/DC conversion circuits and DC/DC conversion circuits, and outputting applicable charging electrical signals for battery pack charging. Here No longer.

In the technical solution provided by the embodiment of the present application, the smallest difference is selected from the differences between the demand charging current values and the parallel charging current values of multiple battery packs, and the smallest difference is used as the target difference, and is calculated according to the target The difference determines the parallel request current value corresponding to the current current adjustment period, and finally sends the parallel request current value to the power supply, so that the power supply outputs an electrical signal with the parallel request current value to charge each battery pack. In this way, since in each current adjustment period, the minimum difference between the demand charging current value and the parallel charging current value in all battery packs is determined, that is, the parallel request current corresponding to the current current adjustment period is determined based on the target difference. value, so that the charging current provided by the power supply can be closer to the required charging current value of each battery pack after each current adjustment cycle without exceeding the required current value of each battery pack. At the same time, it also avoids the need for a single battery pack. The actual charging current value is greater than the required charging current value, which improves the safety and reliability of parallel charging of multiple battery packs.

In some embodiments, see FIG. 3 , which schematically shows a specific flow chart for implementing step S103 in an embodiment of the present application. Determining the parallel request current value corresponding to the current current adjustment period based on the target difference and the parallel request current value determined in the previous current adjustment period may include the following steps S301 to S302.

Step S301: Determine the product of the target difference value and the first preset proportional coefficient as the first adjustment value.

In step S301, the first preset proportional coefficient may be a constant, or may be a variable that continues to increase with changes in the current adjustment period.

In specific implementation, the change rate of the first preset proportional coefficient can be configured according to actual adjustment requirements, that is, when the change increment of the first preset proportional coefficient is 0, the first preset proportional coefficient is a constant, and when the first preset proportional coefficient When the change increment of the preset proportional coefficient is greater than 0, the first preset proportional coefficient is a variable that continues to increase with the change of the current adjustment period.

Step S302: Add the first adjustment value to the parallel request current value determined in the previous current adjustment period to obtain the parallel request current value corresponding to the current current adjustment period.

During implementation, the target difference and the parallel request current value determined in the previous current adjustment period can be directly substituted into the preset formula to calculate the parallel request current value corresponding to the current current adjustment period.

Specifically, the preset formula is send_chg_amp=send_chg_amp_P+kp*error_value.

Among them, kp*error_value represents the first adjustment value, kp is the first preset proportional coefficient; send_chg_amp_P is the parallel machine request current value determined in the previous current adjustment period, and the first adjustment value is combined with the parallel machine request current value determined in the previous current adjustment period. By summing the requested current values, you can get send_chg_amp as the parallel requested current value corresponding to the current current adjustment period.

In this way, through the target difference and the parallel request current value determined in the previous current adjustment period, it is easy to determine the parallel request current value corresponding to the current current adjustment period, and then determine how much current to request from the power supply.

In some embodiments, step S302 adds the first adjustment value to the parallel request current value determined in the previous current adjustment period to obtain the parallel request current value corresponding to the current current adjustment period, including:

If the current period is the first current adjustment period, the first adjustment value is used as the parallel machine request current value corresponding to the current current adjustment period.

Specifically, the first current adjustment period refers to the period when the charging current is adjusted for the first time. In the first current adjustment period, the parallel request current value determined in the previous current adjustment period is 0, then the parallel request current value corresponding to the current current adjustment period is the product of the target difference and the first preset proportional coefficient, that is is the first adjustment value.

In this way, during the first current adjustment period, the first adjustment value is used as the parallel request current value corresponding to the current current adjustment period, which is beneficial to determining the parallel request current value corresponding to the next period.

In order to facilitate understanding of the technical solution of this application, the following example takes three battery packs, namely battery pack 1, battery pack 2 and battery pack 3. It is assumed that the required charging currents of battery packs 1, 2 and 3 are all 50A. In the initial state, the power supply is connected, that is, the power supply is connected to charge each battery pack. Since this is the first current adjustment period, during the first current adjustment period, the target difference is 50. Since the parallel request current value determined in the previous current adjustment period of the first current adjustment period is 0, assuming the first preset proportional coefficient is 1, the parallel request current value corresponding to the current current adjustment period can be obtained: 0+1 *50＝50A.

When the power supply charges multiple battery packs in parallel, it cannot directly output the corresponding charging current according to the parallel request current value. Instead, it increases the output charging current after each current adjustment cycle. After the first current adjustment period, in the second current adjustment period, it is assumed that the parallel charging current values obtained by each battery pack are 3A, 5A and 10A respectively. That is, although the parallel request current value is 50A, at this time The charging current output by the power supply is only 18A. Calculate the difference between the required charging current value of each battery pack and the parallel charging current value. The differences between the three battery packs can be found to be 47, 45 and 40 respectively. Summarize all differences to obtain the set of differences {47, 45, 40}. Select the smallest difference as the target difference, which is 40. Based on the target difference and the parallel request current value determined in the previous current adjustment period, the parallel request current value corresponding to the current current adjustment period is determined. Specifically, the parallel request current value corresponding to the second current adjustment period can be obtained: 40+1*50=90A. It can be seen that although the parallel request current value is 50A in the first current adjustment period, the charging current output by the power supply is only 18A. Therefore, in the second current adjustment period, the parallel request current value is adjusted to 90A, which is In order to increase the output current value of the power supply in response to the parallel charging request.

Taking the above-mentioned second battery adjustment cycle as an example, as another example, assuming that the first preset proportional coefficient is a variable and its change increment is 0.2, then the first preset proportional coefficient changes from 1 to 1.2. Based on the target difference 40 and the parallel request current value 50A determined in the previous current adjustment period, the parallel request current value corresponding to the current current adjustment period is determined to be: 40+1.2*50=112A. Request a current value of 112A from the power supply, and the power supply outputs an electrical signal of 40A to charge battery pack 1, battery pack 2 and battery pack 3 in parallel.

Based on the above example, the above adjustment process is repeated in each battery adjustment cycle until the actual charging current of a certain battery pack stabilizes within the preset range of the required charging current value, thereby achieving stable charging of each battery pack. It should be noted that the data here are only for illustration and do not represent actual data.

Referring to Figure 4, Figure 4 schematically shows a specific flow chart for implementing step S104 in an embodiment of the present application. When requesting a parallel current value from the power supply, the power supply at least includes a first power supply and a second power supply, and the power supply priority of the first power supply is greater than the power supply priority of the second power supply. In some embodiments, step S104 sends a parallel request current value to the power supply, and may also include the following steps S401 to S402.

Step S401: Obtain the maximum output current value of the first power supply.

Specifically, the first power supply is used to charge each battery pack, and the maximum output current value of the first power supply refers to the maximum charging current value that the first power supply can output.

Step S402: When the parallel request current value is less than or equal to the maximum output current value of the first power supply, send the parallel request current to the first power supply.

When the parallel request current value is less than or equal to the maximum output current value of the first power supply, the parallel request current is sent to the first power supply. When there are multiple power supplies, since the parallel request current value is less than or equal to the maximum output current value of the first power supply, that is, the first power supply can meet the parallel request current value and directly sends the parallel request current value to the first power supply. Charging needs are met by requesting current. For example, the maximum output current value of the first power supply is 50A, and the parallel request current value is 25A. Since the parallel request current value is smaller than the maximum output current value of the first power supply, the parallel request current is sent to the first power supply. In this way, the power consumption of another power supply is reduced.

In some embodiments, see FIG. 5 , which schematically shows a specific flow chart for implementing step S104 in another embodiment of the present application. Step S104 sends a parallel request current value to the power supply, and may also include the following steps S501 to S503.

Step S501: When the parallel request current value is greater than the maximum output current value of the first power supply, calculate the charging difference between the parallel request current value and the maximum output current value of the first power supply.

For example, if the maximum output current value of the first power supply is 50A and the parallel request current value is 200A, then the parallel request current value is greater than the maximum output current value of the first power supply. Calculate the charging difference between the parallel machine request current value and the maximum output current value of the first power supply, that is, the difference between the two is 150A.

Step S502: Send the output current value of the first power supply to the first power supply; the output current value is less than or equal to the maximum output current value.

When the parallel machine request current value is greater than the maximum output current value of the first power supply, the maximum output current value of the first power supply may be requested from the first power supply or only a partial current value may be requested. In this way, those skilled in the art can select how much current value to send to the first power supply according to actual needs, and the flexibility is relatively high.

Based on the above example, since the maximum output current value of the first power supply is 50A, the first output current value is sent to the first power supply, which may be, for example, 50A or less than 50A. Those skilled in the art can choose according to actual needs.

Step S503: When the charging difference is less than or equal to the maximum output current value of the second power supply, send the charging difference to the second power supply.

In step S503, since the charging difference is less than or equal to the maximum output current value of the second power supply, the charging difference is directly sent to the second power supply, which can instruct the second power supply to output an electrical signal matching the charging difference.

Based on the above example, as an example, assume that the maximum current value that the second power supply can output is 180A. Since the charging difference between the calculated parallel request current value and the maximum output current value of the first power supply is 150A, If the maximum current value that the second power supply can output is 180A, a current value of 150A can be sent to the second power supply.

In this way, when the parallel request current value is greater than the maximum output current value of the first power supply, the output current value of the first power supply is sent to the first power supply, and at the same time, the charging difference value can be sent to the second power supply, thus satisfying the requirements to the greatest extent. Parallel machine request current value requirement.

It can be understood that in other embodiments, the power supply may also include a third power supply. When the charging difference value is greater than the maximum output current value of the second power supply, the output current value of the second power supply is sent to the second power supply, and the difference between the charging difference value and the output current value of the second power supply is, Sent to third power source.

Based on the above example, in another example, it is assumed that the maximum current value that the second power supply can output is 120A. Since the charging difference between the calculated parallel request current value and the maximum output current value of the first power supply is 150A, which is greater than the maximum current value 120A that the second power supply can output, then a current value of 30A can be sent to the third power supply.

It is easy to understand that in all embodiments of the present application, when the power source includes two or more power sources, the corresponding power supply priority can be configured according to the greenhouse gas emission level of each power source, or according to the degree of greenhouse gas emissions of each power source. The unit power generation cost is used to configure the corresponding power supply priority.

For example, power sources include photovoltaic power generation systems, wind power generators and fuel generators. Obviously, the greenhouse gas emissions and power generation costs of photovoltaic power supplies and wind power generators are lower than those of fuel generators. Therefore, the power supply priority of the photovoltaic power generation system and the wind energy generator is higher than that of the fuel generator.

It is understandable that since non-clean energy power sources such as fuel generators have higher power generation capacity and earlier technology development, their power supply is more stable than clean energy power sources. Therefore, in the specific implementation, the power supply priority can also be configured according to the power generation capacity.

For example, a power supply with greater generating power has a lower power supply priority. Examples of power sources include photovoltaic power generation systems, wind energy generators, and fuel-fired generators. The power generation power of the fuel generator is greater than the power generation power of the photovoltaic power source, and is greater than the power generation power of the wind energy generator. Therefore, the power supply priority of the fuel generator is lower than the power supply priority of the photovoltaic power generation system, and is lower than the power supply priority of the wind energy generator. class.

In order to facilitate understanding of the embodiments of this application, for example, in a multi-power supply scenario, different power supplies have different priorities. Assume that there are three power supplies, power supply A, power supply B and power supply C. The power supply priority of power supply A is greater than that of power supply The power supply priority of power supply B is greater than the power supply priority of power supply C. Power supply A can be photovoltaic, power supply B can be commercial power, and power supply C can be an oil-driven generator. After multiple power supplies are connected, assume that the parallel request current value of the parallel battery pack is 280A. If power supply A can only output 80A at this time, then an additional request is generated based on the remaining 200A and sent to power supply B. If power supply B The maximum output current value is 160A, and an additional request is generated and sent to power supply C based on the remaining 40A.

In this embodiment, by setting the power supply priority between different power sources, the clean energy power source can be used to maximize the parallel charging of multiple battery packs, and at the same time, the non-clean energy power sources are used to provide collaborative power supply, thereby ensuring that the multi-battery packs can be charged in parallel. Stability and safety of parallel charging.

In some embodiments, see FIG. 6 , which schematically shows a specific flow chart for implementing step S104 in yet another embodiment of the present application. Sending the parallel request current value to the power supply may also include the following steps S601 to S603.

Step S601: When the parallel request current value is greater than the maximum output current value of the first power supply, obtain the power supply ratio of the first power supply and the second power supply.

The power supply ratio refers to the proportion of the first power supply and the second power supply supplying power to each battery pack. When the parallel request current value is greater than the maximum output current value of the first power supply, and there are multiple power supplies supplying power, you can supply power to the third power supply respectively. A power supply and a second power supply are requested to provide power. In this way, the need for fast power supply can be met.

Step S602, calculating a first output current value and a second output current value according to the power supply ratio and the parallel request current value; the power supply ratio of the first power supply is greater than the power supply ratio of the second power supply.

According to the power supply ratio, the current requested from the first power source and the current requested from the second power source can be determined. Since the power supply priority of the first power supply is greater than the power supply priority of the second power supply, the power supply ratio of the first power supply can be greater than the power supply ratio of the second power supply.

Step S603: Send the first output current value to the first power supply, and send the second output current value to the second power supply.

In this way, the first output current value is sent to the first power supply and the second output current value is sent to the second power supply, which is beneficial to improving charging efficiency.

In some embodiments, step S601, obtaining a power supply ratio of the first power source to the second power source, includes:

The power supply ratio of the first power supply and the second power supply is determined according to the power supply priority of the first power supply and the power supply priority of the second power supply.

Specifically, the power supply ratio of the first power supply and the power supply ratio of the second power supply can be determined according to the power supply priorities of the first power supply and the second power supply. For example, since the power supply priority of the first power supply is greater than the power supply priority of the second power supply, the power supply ratio of the first power supply with a higher power supply priority can be set to be larger, while the power supply ratio of the second power supply with a lower power supply priority can be set to be smaller. For the ratio of the power supply ratio of the first power supply to the second power supply, those skilled in the art can limit it according to actual needs. In this way, the corresponding power supply ratio is determined by the power supply priority of each power supply, which is conducive to making full use of each power supply.

According to one aspect of the embodiment of the present application, a power distribution equipment is provided. See FIG. 7 , which schematically shows a structural block diagram of the power distribution equipment in an embodiment of the present application. The power distribution device 700 includes: a power connection port 701, a controller 702 and a power supply port 703; the power supply port 703 is configured to connect a battery pack; the controller 702 is configured to obtain the requirements of each battery pack in each current adjustment cycle. The difference between the charging current value and the parallel charging current value is used to obtain a difference set; the difference with the smallest value in the difference set is determined as the target difference; based on the target difference, the parallel request current corresponding to the previous current adjustment cycle is calculated The value is updated to obtain the parallel request current value corresponding to the current current adjustment cycle; the parallel request current value is sent to the power supply, so that the power supply outputs an electrical signal with the parallel request current value to charge multiple battery packs. The controller 702 can perform the above-mentioned parallel charging method of multiple battery packs. Since the specific details of the parallel charging method of multiple battery packs have been described in detail in the above content, they will not be described again here.

Referring to FIG. 8A , FIG. 8A schematically shows a usage scenario diagram of power distribution equipment in an embodiment of the present application. Multiple power sources can be connected to the power distribution equipment 800, such as power source A, power source B, power source C, and power source D. The power distribution equipment can charge multiple parallel battery packs at the same time.

As shown in FIG. 8A , the power distribution device 800 includes: a power connection port 810 , a power supply port 820 and a controller 830 . Among them, the power supply port 820 is configured to connect to the battery pack.

In FIG. 8A , energy storage device 801 includes battery pack 1 , and energy storage device 801 is in parallel with battery pack 2 and battery pack 3 . After the power distribution device 800 is connected to the energy storage device 801 through the power supply port 820, it can charge multiple battery packs in parallel.

The controller 830 is configured to: in each current adjustment period, obtain the difference between the required charging current value and the parallel charging current value of each battery pack to obtain a set of differences.

The controller 830 is further configured to determine the difference with the smallest value in the difference set as the target difference.

The controller 830 is also configured to update the parallel machine request current value corresponding to the previous current adjustment period based on the target difference value to obtain the parallel machine request current value corresponding to the current current adjustment period.

The controller 830 is further configured to send a parallel request current value to the power supply, so that the power supply outputs an electrical signal having a parallel request current value to charge multiple battery packs.

It can be understood that since the specific charging process has been described in detail in the above content, it will not be described again here.

Referring to FIG. 8B , in this embodiment, the power distribution equipment is not an independent device, but the energy storage device is directly used as the power distribution equipment to realize this function. The energy storage device can be a host arbitrated among multiple battery packs, or it can be a device directly configured with host functions. Figure 8B schematically shows a structural block diagram of an energy storage device in another embodiment of the present application. Multiple power sources can be connected to the energy storage device 801, such as power source A, power source B, power source C, and power source D. Energy storage device 801 includes battery pack 1 and is parallel to battery pack 2 and battery pack 3 .

After the energy storage device 801 is incorporated into the battery pack 2 and the battery pack 3, the BMS in the energy storage device 801 is the host. That is, the BMS of the energy storage device is used as the host to perform the control operation of the entire charging process. Other battery packs use CAN Communicate with this host. Since the specific charging process has been described in detail above, it will not be described again here. It should be noted that although the various steps of the methods in this application are described in a specific order in the drawings, this does not require or imply that these steps must be performed in that specific order, or that all of the steps shown must be performed to achieve the desired results. the result of. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution, etc.

The following describes the device embodiments of the present application, which can be used to perform the multi-battery pack parallel charging method in any of the above-mentioned embodiments of the present application. The beneficial effects of the device performing the above-described multi-battery pack parallel charging method can be seen in any of the above-mentioned embodiments. . Figure 9 schematically shows a structural block diagram of a multi-battery pack parallel charging device provided by an embodiment of the present application. As shown in Figure 9, the multi-battery pack parallel charging device 900 includes:

The difference set acquisition unit 901 is configured to obtain the difference between the required charging current value and the parallel charging current value of each battery pack in each current adjustment period to obtain a difference set;

The target difference determination unit 902 is configured to determine the difference with the smallest value in the difference set as the target difference;

The requested current value determination unit 903 is configured to determine the parallel request current value corresponding to the current current adjustment period based on the target difference and the parallel request current value determined in the previous current adjustment period;

The request current value sending unit 904 is configured to send a parallel request current value to the power source, so that the power source outputs an electrical signal with the parallel request current value to charge the multiple battery packs.

This embodiment provides a multi-battery pack parallel charging device. The beneficial effects of the multi-battery pack parallel charging device when executing the above multi-battery pack parallel charging method can be seen in any of the above-mentioned embodiments and will not be described again here.

Figure 10 schematically shows a structural block diagram of a computer system used to implement a power distribution device according to an embodiment of the present application.

It should be noted that the computer system 1000 of the power distribution equipment shown in FIG. 10 is only an example, and should not impose any restrictions on the functions and scope of use of the embodiments of the present application.

As shown in Figure 10, the computer system 1000 includes a central processing unit 1001 (Central Processing Unit, CPU), which can be loaded into a random computer according to a program stored in a read-only memory 1002 (Read-Only Memory, ROM) or from a storage part 1008. Access the program in the memory 1003 (Random Access Memory, RAM) to perform various appropriate actions and processes. In the random access memory 1003, various programs and data required for system operation are also stored. The central processing unit 1001, the read-only memory 1002 and the random access memory 1003 are connected to each other through a bus 1004. The input/output interface 1005 (Input/Output interface, ie, I/O interface) is also connected to the bus 1004.

The following components are connected to the input/output interface 1005: an input part 1006 including a keyboard, a mouse, etc.; an output part 1007 including a cathode ray tube (Cathode Ray Tube, CRT), a liquid crystal display (Liquid Crystal Display, LCD), etc., and a speaker, etc. ; a storage part 1008 including a hard disk, etc.; and a communication part 1009 including a network interface card such as a LAN card, a modem, etc. The communication section 1009 performs communication processing via a network such as the Internet. Driver 1010 is also connected to input/output interface 1005 as needed. Removable media 1011, such as magnetic disks, optical disks, magneto-optical disks, semiconductor memories, etc., are installed on the drive 1010 as needed, so that a computer program read therefrom is installed into the storage portion 1008 as needed.

In particular, according to embodiments of the present application, the processes described in the respective method flow charts may be implemented as computer software programs. For example, embodiments of the present application include a computer program product including a computer program carried on a computer-readable medium, the computer program containing program code for performing the method illustrated in the flowchart. In such embodiments, the computer program may be downloaded and installed from the network via communication portion 1009 and/or installed from removable media 1011. When the computer program is executed by the central processor 1001, various functions defined in the system of the present application are executed.

It should be noted that 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 above two. The computer-readable storage medium may be, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination thereof. More specific examples of computer readable storage media may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard drive, random access memory (RAM), read only memory (ROM), removable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), flash memory, optical fiber, portable compact disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), optical storage device, magnetic storage device, or any of the above suitable The combination. As used herein, a computer-readable storage medium may be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, in which computer-readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than computer-readable storage media that can send, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

Through the above description of the embodiments, those skilled in the art can easily understand that the example embodiments described here can be implemented by software, or can be implemented by software combined with necessary hardware. Therefore, the technical solution according to the embodiment of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, U disk, mobile hard disk, etc.) or on the network , including several instructions to cause a computing device (which can be a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiment of the present application.

Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary technical means in the technical field that are not disclosed in this application. .

It is to be understood that the present application is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A parallel charging method for multiple battery packs includes:

   In each current adjustment cycle, obtain the difference between the required charging current value and the parallel charging current value of each battery pack to obtain a set of differences;

   Determine the difference with the smallest value in the difference set as the target difference;

   Update the parallel request current value corresponding to the previous current adjustment period based on the target difference value to obtain the parallel request current value corresponding to the current current adjustment period;

   The parallel request current value is sent to the power supply, so that the power supply outputs an electrical signal having the parallel request current value to charge a plurality of battery packs.
2. The multi-battery pack parallel charging method according to claim 1, wherein the parallel request current value corresponding to the previous current adjustment period is updated based on the target difference value to obtain the parallel request current value corresponding to the current current adjustment period. Request current value, including:

   Determine the product of the target difference and the first preset proportional coefficient as the first adjustment value;

   The first adjustment value is added to the parallel request current value determined in the previous current adjustment period to obtain the parallel request current value corresponding to the current current adjustment period.
3. The multi-battery pack parallel charging method according to claim 2, wherein the first adjustment value is added to the parallel request current value determined in the previous current adjustment period to obtain the parallel request current value corresponding to the current current adjustment period. The machine requests current values, including:

   If the current period is the first current adjustment period, the first adjustment value is used as the parallel request current value corresponding to the current current adjustment period.
4. The multi-battery pack parallel charging method according to any one of claims 1 to 3, wherein the power supply at least includes a first power supply and a second power supply, and the power supply priority of the first power supply is greater than that of the second power supply. power supply priority;

   The sending of the parallel request current value to the power supply includes:

   Obtain the maximum output current value of the first power supply;

   When the parallel request current value is less than or equal to the maximum output current value of the first power supply, the parallel request current is sent to the first power supply.
5. The multi-battery pack parallel charging method according to claim 4, wherein said sending the parallel request current value to the power source further includes:

   When the parallel machine request current value is greater than the maximum output current value of the first power supply, calculate the charging difference between the parallel machine request current value and the maximum output current value of the first power supply;

   sending an output current value of the first power supply to the first power supply; the output current value is less than or equal to the maximum output current value; and

   When the charging difference is less than or equal to the maximum output current value of the second power supply, the charging difference is sent to the second power supply.
6. The multi-battery pack parallel charging method according to claim 4, wherein said sending the parallel request current value to the power source further includes:

   When the parallel request current value is greater than the maximum output current value of the first power supply, obtain the power supply ratio of the first power supply and the second power supply;

   The first output current value and the second output current value are calculated according to the power supply ratio and the parallel request current value; the power supply ratio of the first power supply is greater than the power supply ratio of the second power supply;

   The first output current value is sent to the first power supply, and the second output current value is sent to the second power supply.
7. The multi-battery pack parallel charging method according to claim 6, wherein said obtaining the power supply ratio of the first power supply and the second power supply includes:

   The power supply ratio of the first power supply and the second power supply is determined according to the power supply priority of the first power supply and the power supply priority of the second power supply.
8. The multi-battery pack parallel charging method according to claim 7, wherein the first power supply and the third power supply are determined based on the power supply priority of the first power supply and the power supply priority of the second power supply. The power supply ratio of the two power supplies includes:

   When the power supply priority of the first power supply is greater than the power supply priority of the second power supply, it is determined that the power supply ratio of the first power supply is greater than the power supply ratio of the second power supply.
9. A kind of power distribution equipment, the power distribution equipment includes:

   power connection port;

   The power supply port is configured to connect to the battery pack;

   Controller, configured as:

   In each current adjustment cycle, obtain the difference between the required charging current value and the parallel charging current value of each battery pack to obtain a set of differences;

   Determine the difference with the smallest value in the difference set as the target difference;

   The parallel request current value corresponding to the previous current adjustment period is updated based on the target difference to obtain the parallel request current value corresponding to the current adjustment period;

   The parallel request current value is sent to the power supply, so that the power supply outputs an electrical signal having the parallel request current value to charge a plurality of battery packs.
10. A computer-readable medium. A computer program is stored on the computer-readable medium. When the computer program is executed by a processor, the multi-battery pack parallel charging method according to any one of claims 1 to 7 is implemented.

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