Method, device and system for adjusting electric quantity of parallel battery and parallel battery

Abstract

The invention discloses an electric quantity adjusting method, device and system of a parallel battery and the parallel battery, and belongs to the field of batteries, the parallel battery comprises a plurality of initial battery clusters connected in parallel, and the method comprises the following steps: obtaining a value corresponding to a real-time charge state of each initial battery cluster in the parallel battery to obtain a plurality of real-time electric quantity values; screening two initial battery clusters from the plurality of initial battery clusters as target battery clusters according to the numerical values of the plurality of real-time electric quantity values; and controlling the short-circuit switch unit connected with each target battery cluster to be closed, so that the two target battery clusters form a conducted loop and electric quantity adjustment is carried out. Adjustment is performed without depending on an external power supply, battery aging can be delayed, and charging and discharging efficiency can be improved through adjustment of the internal battery, so that adjustment efficiency is improved, and the use requirements of users are met.

Description

Background Art

[0002] Due to the inconsistency of battery production, working environment, and aging, the open circuit voltage and equivalent series resistance of each battery cell are different to varying degrees, resulting in inconsistent charge states of parallel battery clusters when the battery energy storage system is running. For example, when charging parallel battery clusters, if one battery cluster is fully charged while other battery clusters are not fully charged, the remaining battery clusters will not be able to be further charged to avoid overcharging; similarly, when discharging, if one battery cluster has reached the minimum allowable charge state while the remaining battery clusters can still be further discharged, all parallel and series battery cells will stop discharging to avoid damage caused by overdischarge.

[0003] Since the available capacity of a parallel battery cluster can only reach the capacity of the weakest battery cluster, it leads to a serious parallel mismatch problem, which makes the capacity of other parallel battery clusters unable to be fully used, reducing the available capacity. To this end, it is necessary to adjust the power of each battery cluster in the parallel battery to increase the available capacity of the battery. The commonly used method is: connect a converter in series to each battery cluster, and the other end of each converter is connected to an external power supply. The converter is powered by an external power supply, and the voltage of the converter connected in series to the battery cluster is controlled to control the current of the battery cluster, so that the current of the battery cluster is consistent, so that the power of the battery cluster remains the same.

[0004] However, the commonly used methods currently have the following technical problems: during each adjustment process, an external power supply needs to be called to provide power. Long-term reliance on the external power supply will not only accelerate the aging of the battery, but also the external power supply has low charging and discharging efficiency and slow adjustment efficiency, which is difficult to meet the user's usage needs. Summary of the invention

[0005] The present invention provides a method, device, system and parallel batteries for regulating the power of parallel batteries. The method can solve the technical problems of the prior art that the battery is aged rapidly and the charging and discharging regulation efficiency is low.

[0006] A first aspect of an embodiment of the present invention provides a method for regulating power of parallel batteries, wherein the parallel batteries include a plurality of initial battery clusters connected in parallel, and the method includes:

[0007] Obtain the value corresponding to the real-time state of charge of each initial battery cluster in the parallel battery to obtain multiple real-time power values;

[0008] Selecting two target battery clusters from the plurality of initial battery clusters according to the numerical values of the plurality of real-time power values, wherein the two target battery clusters are battery clusters whose deviations between the real-time power values and the power threshold values are opposite;

[0009] Control the short - circuit switch units connected to each of the target battery clusters to close, so that the two target battery clusters form a conducting loop and perform power adjustment.

[0010] The present invention can obtain the real - time power values of each initial battery cluster in the parallel batteries; screen two battery clusters with different power values and opposite deviation types according to the magnitudes of the multiple real - time power values, and then control the two battery clusters to form a conducting loop and perform power adjustment. Each adjustment does not require an external power supply, which can not only delay battery aging, but also improve the charge - discharge efficiency through internal batteries, thereby improving the adjustment efficiency to meet the user's usage requirements.

[0011] In combination with the first aspect, in one implementation, the screening of two from multiple initial battery clusters as target battery clusters according to the magnitudes of the multiple real - time power values includes:

[0012] Calculate the average value of the multiple real - time power values to obtain the power average value, and use the power average value as the power threshold;

[0013] Calculate the difference between each real - time power value and the power threshold to obtain multiple power differences;

[0014] Screen the largest and the smallest power differences from the multiple power differences, and use the initial battery clusters corresponding to the largest and the smallest power differences as the target battery clusters.

[0015] In combination with the first aspect, in one implementation, the control of closing the short - circuit switch units connected to each of the target battery clusters includes:

[0016] Determine the power deviation type of each target battery cluster, where the power deviation type is the positive - negative value type of the difference between the real - time power value and the power threshold;

[0017] Control the short - circuit switch units connected to the target battery clusters to close according to the power deviation type.

[0018] In combination with the first aspect, in one implementation, the short - circuit switch unit includes a first short - circuit switch and a second short - circuit switch;

[0019] Each initial battery cluster is connected in series with a first capacitor and a second capacitor. Among them, the initial battery cluster and the first capacitor are connected in series in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, the first capacitor is connected in parallel with the first short - circuit switch, and the second capacitor is connected in parallel with the second short - circuit switch;

[0020] The control of closing the short - circuit switch unit connected to the target battery cluster according to the power deviation type includes:

[0021] If the power deviation type is a positive type, control the second short - circuit switch of the target battery cluster to close;

[0022] If the power deviation type is a negative type, control the first short - circuit switch of the target battery cluster to close.

[0023] Combined with the first aspect, in one implementation, the parallel battery further includes: a converter, and the converter is connected to the short - circuit switch unit of each initial battery cluster;

[0024] The operation of power adjustment includes:

[0025] After the short - circuit switch unit is closed, determine the target currents of the two target battery clusters, where the target currents are the corresponding currents when the two target battery clusters have the same state of charge;

[0026] Control the converter to adjust the real - time currents of the two target battery clusters to the target currents at a preset speed.

[0027] The second aspect of the embodiments of the present invention provides a device for adjusting the power of a parallel battery, and the device includes:

[0028] An acquisition module, configured to acquire the values corresponding to the real - time state of charge of each initial battery cluster in the parallel battery to obtain a plurality of real - time power values;

[0029] A screening module, configured to screen two from a plurality of initial battery clusters as target battery clusters according to the numerical magnitudes of the plurality of real - time power values, where the two target battery clusters are battery clusters whose deviations of the real - time power values from the power threshold are opposite numbers;

[0030] An adjustment module, configured to control the short - circuit switch units connected to each target battery cluster to close, so that the two target battery clusters form a conducting loop and perform power adjustment.

[0031] Combined with the second aspect, in one implementation, the screening of two from a plurality of initial battery clusters as target battery clusters according to the numerical magnitudes of the plurality of real - time power values includes:

[0032] Calculate the average value of the plurality of real - time power values to obtain a power average value, and use the power average value as the power threshold;

[0033] Calculate the difference between each real - time power value and the power threshold to obtain a plurality of power differences;

[0034] Select the largest and smallest power differences from among the multiple power differences, and use the initial battery clusters corresponding to the largest and smallest power differences as the target battery clusters.

[0035] Combined with the second aspect, in one implementation, controlling each of the short-circuit switch units connected to the target battery clusters to close includes:

[0036] Determine the power deviation type of each of the target battery clusters, where the power deviation type is the positive or negative type of the difference between the real-time power value and the power threshold;

[0037] Control the short-circuit switch unit connected to the target battery cluster to close according to the power deviation type.

[0038] Combined with the second aspect, in one implementation, the short-circuit switch unit includes a first short-circuit switch and a second short-circuit switch;

[0039] Each of the initial battery clusters is connected in series with a first capacitor and a second capacitor. Among them, the initial battery cluster and the first capacitor are connected in series in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, the first capacitor is connected in parallel with the first short-circuit switch, and the second capacitor is connected in parallel with the second short-circuit switch;

[0040] The controlling the short-circuit switch unit connected to the target battery cluster to close according to the power deviation type includes:

[0041] If the power deviation type is a positive type, control the second short-circuit switch of the target battery cluster to close;

[0042] If the power deviation type is a negative type, control the first short-circuit switch of the target battery cluster to close.

[0043] Combined with the second aspect, in one implementation, the parallel battery further includes: a converter, and the converter is connected to the short-circuit switch unit of each initial battery cluster;

[0044] The operation of power adjustment includes:

[0045] After the short-circuit switch unit is closed, determine the target currents of the two target battery clusters, where the target current is the corresponding current when the two target battery clusters have the same state of charge;

[0046] Control the converter to adjust the real-time currents of the two target battery clusters to the target current at a preset speed.

[0047] The third aspect of the embodiment of the present invention provides a power adjustment system for parallel batteries. The system includes: a control circuit and parallel batteries, and the control circuit is applicable to the power adjustment method of the parallel batteries as described above.

[0048] The fourth aspect of the embodiment of the present invention provides a parallel battery, which includes: a plurality of initially connected battery clusters connected in parallel, a plurality of first capacitors, a plurality of second capacitors, a plurality of first short-circuit switches, and a plurality of second short-circuit switches;

[0049] Each of the initially connected battery clusters is connected in series with the first capacitor in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, each first capacitor is connected in parallel with a first short-circuit switch, and each second capacitor is connected in parallel with a second short-circuit switch.

[0050] Combined with the fourth aspect, in one implementation, the parallel battery further includes: a converter;

[0051] The first end of the converter is connected in parallel with each of the first capacitors;

[0052] The second end of the converter is connected in parallel with each of the second capacitors.

[0053] Combined with the fourth aspect, in one implementation, the parallel battery further includes: a first selection switch and a second selection switch;

[0054] The first end of the converter is connected in parallel with each of the first capacitors through the first selection switch;

[0055] The second end of the converter is connected in parallel with each of the second capacitors through the second selection switch.

[0056] Compared with the prior art, the power adjustment method, device, system and parallel battery provided by the embodiment of the present invention have the beneficial effects that: the present invention can obtain the real-time power values of each initially connected battery cluster in the parallel battery; screen two battery clusters with different power values and opposite deviation types according to the numerical magnitudes of the multiple real-time power values, and then control the two battery clusters to form a conducting loop and perform power adjustment. Each adjustment does not require an external power supply, which can not only delay battery aging, but also improve the charge and discharge efficiency through internal batteries, thereby improving the adjustment efficiency to meet the user's usage requirements. Description of the Drawings

[0057] Figure 1 is a schematic flowchart of a power adjustment method for a parallel battery provided by an embodiment of the present invention;

[0058] Figure 2It is a schematic structural diagram of a power adjustment device for parallel batteries provided by an embodiment of the present invention;

[0059] Figure 3 It is a schematic structural diagram of a power adjustment system for parallel batteries provided by an embodiment of the present invention;

[0060] Figure 4 It is a schematic circuit diagram of parallel batteries provided by an embodiment of the present invention;

[0061] Figure 5 It is a control operation flowchart of parallel batteries provided by an embodiment of the present invention;

[0062] Figure 6 It is a diagram of the principle for allocating the reference value of the state of charge equalization current of parallel batteries provided by an embodiment of the present invention. Specific embodiments

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0064] Due to the inconsistencies in the production and manufacturing, working environment, and aging degree of the batteries, there are varying degrees of differences in the open-circuit voltage and equivalent series resistance of each battery cell, resulting in inconsistent states of charge of the parallel battery clusters during the operation of the battery energy storage system. For example, when the parallel battery clusters are charging, there may be a situation where one battery cluster is fully charged while others are not. To avoid overcharging, the remaining battery clusters cannot be further charged; similarly, during discharging, when one battery cluster has reached the minimum allowable state of charge while the remaining battery clusters can still be further discharged, to avoid damage caused by over-discharging, all the serially connected battery cells in parallel will stop discharging further.

[0065] Since the available capacity of the parallel battery clusters can only reach the capacity of the weakest battery cluster, it leads to a serious parallel mismatch problem, making the capacities of other parallel battery clusters unable to be fully utilized and reducing the available capacity. Therefore, it is necessary to adjust the power of each battery cluster in the parallel batteries to improve the available capacity of the batteries. The commonly used method at present is to connect a converter in series to each battery cluster, and the other end of each converter is connected to an external power supply. By supplying power to the converter through the external power supply and controlling the voltage of the converter connected in series to the battery cluster to control the battery cluster current, the battery cluster currents are made consistent, so that the powers of the battery clusters are kept the same.

[0066] However, the commonly used methods at present have the following technical problems: In each adjustment process, it is necessary to call an external power supply to provide power. Relying on the external power supply for a long time will not only accelerate the aging of the battery, but also the charging and discharging efficiency of the external power supply is low, the adjustment efficiency is slow, and it is difficult to meet the user's usage requirements.

[0067] To solve the above problems, the following specific embodiments will be used to introduce and illustrate in detail a method, device, system, and parallel battery for adjusting the power of a parallel battery provided by an embodiment of the present application.

[0068] Refer to Figure 1 , to solve the technical problems that the existing technology calls an external power supply to provide power for power adjustment, which will accelerate the aging of the battery, and has low charging and discharging efficiency and slow adjustment efficiency, a schematic flowchart of a method for adjusting the power of a parallel battery provided by an embodiment of the present invention is shown.

[0069] In one embodiment, the method involves a parallel battery, and the parallel battery includes a plurality of initially connected battery clusters connected in parallel. For example, it is composed of N initially connected battery clusters connected in parallel.

[0070] Among them, as an example, the method for adjusting the power of the parallel battery may include:

[0071] S11. Obtain the values corresponding to the real-time state of charge of each initially connected battery cluster in the parallel battery to obtain a plurality of real-time power values.

[0072] In one embodiment, it is possible to obtain the values corresponding to the real-time state of charge (SOC) of each initially connected battery cluster in the parallel battery, detect and compare the state of charge of different initially connected battery clusters in real time, and determine whether the state of charge of each initially connected battery cluster is unbalanced according to the value of the real-time state of charge. When it is found that the state of charge between each initially connected battery cluster is unbalanced, it is possible to control the generation of the current reference values required for different initially connected battery clusters to maintain the balance of the state of charge, and then form a loop for the unbalanced initially connected battery clusters so that they can transmit current to each other, thereby realizing the balanced control of the state of charge of each battery cluster.

[0073] S12. Screen two from the plurality of initially connected battery clusters according to the numerical magnitudes of the plurality of real-time power values, where the two target battery clusters are the battery clusters whose deviations between the real-time power values and the power threshold are opposite numbers.

[0074] In one embodiment, after obtaining the real-time power values corresponding to each initial battery cluster to get a plurality of real-time power values, it is possible to determine which initial battery clusters are abnormal battery clusters according to the numerical magnitudes of the plurality of real-time power values, and use two abnormal battery clusters as target battery clusters, thereby obtaining two target battery clusters. In order to enable the abnormal battery clusters to form a circuit with each other so that the two abnormal battery clusters can transmit current to each other and adjust the power of the two abnormal battery clusters, so that the power of the two abnormal battery clusters reaches equilibrium.

[0075] When screening two abnormal battery clusters, if the power of the two abnormal battery clusters is too high or too low at the same time, even if adjusted, compared with other battery clusters, the two abnormal battery clusters will still be too high or too low, which is also abnormal. For this reason, the two target battery clusters selected are the battery clusters whose deviations of the real-time power values from the power threshold are opposite numbers. That is, among the two target battery clusters, one is a battery cluster with a higher power and the other is a battery cluster with a lower power.

[0076] In an alternative embodiment, in order to determine the battery cluster with a higher power and the battery cluster with a lower power in combination with the actual situation of the parallel batteries.

[0077] Among them, by way of example, the screening of two from a plurality of initial battery clusters as target battery clusters according to the numerical magnitudes of the plurality of real-time power values may include the following sub-steps:

[0078] S121. Calculate the average value of the plurality of real-time power values to obtain a power average value, and use the power average value as the power threshold.

[0079] S122. Calculate the difference between each real-time power value and the power threshold to obtain a plurality of power differences.

[0080] S123. Screen the power difference with the largest numerical value and the power difference with the smallest numerical value from the plurality of power differences, and use the initial battery clusters corresponding to the power difference with the largest numerical value and the power difference with the smallest numerical value as the target battery clusters.

[0081] In one operation mode, after obtaining the real-time power values of the state of charge of each initial battery cluster, it is possible to calculate the average value of the plurality of real-time power values to obtain a power average value, and use the power average value as the power threshold.

[0082] Then calculate the difference between each real-time power value and the power threshold respectively to obtain a plurality of power differences. If the absolute value of the power difference is large, it means that the state of charge of the initial battery cluster corresponding to the power difference is quite different from that of other initial battery clusters. On the contrary, if the absolute value of the power difference is small, it means that the state of charge of the initial battery cluster corresponding to the power difference is less different from that of other initial battery clusters.

[0083] When calculating the difference in power consumption, if the real-time power consumption value is greater than the power consumption threshold, the difference in power consumption is a positive number. Conversely, if the real-time power consumption value is less than the power consumption threshold, the difference in power consumption is a negative number.

[0084] Both the initial battery clusters with real-time power consumption values greater than the power consumption threshold and the initial battery clusters with real-time power consumption values less than the power consumption threshold are abnormal battery clusters. The initial battery clusters with real-time power consumption values greater than the power consumption threshold can charge the initial battery clusters with real-time power consumption values less than the power consumption threshold.

[0085] To screen the initial battery clusters with real-time power consumption values greater than the power consumption threshold, the initial battery cluster with the largest difference in power consumption can be screened to obtain the first target battery cluster. To screen the initial battery clusters with real-time power consumption values less than the power consumption threshold, the initial battery cluster with the smallest difference in power consumption can be screened to obtain the second target battery cluster.

[0086] Subsequently, the initial battery cluster with the most sufficient power can be used to charge the initial battery cluster with insufficient power to balance the power of each battery cluster.

[0087] S13. Control the short-circuit switch unit connected to each of the target battery clusters to close, so that the two target battery clusters form a conducting loop and perform power adjustment.

[0088] In order to enable the two target battery clusters to be separately connected inside the battery to form a conducting loop, and transmit the current of the initial battery cluster with the most sufficient power to the initial battery cluster with insufficient power to charge the initial battery cluster with insufficient power, the short-circuit switch unit connected to the target battery cluster can be controlled to close. After closing the switch of the short-circuit switch unit connected to the target battery cluster, the two target battery clusters can form a conducting loop. At this time, the current of the initial battery cluster with the most sufficient power is transmitted to the initial battery cluster with insufficient power, thereby realizing the power adjustment of the two battery clusters. After a period of time, the power of the initial battery cluster with the most sufficient power decreases, and the power of the initial battery cluster with insufficient power increases. Finally, the power of the two battery clusters tends to be the same.

[0089] During actual operation, after the power adjustment of the two target battery clusters is completed, step S11 can be re-executed to re-obtain the real-time power consumption values of each initial battery cluster in the parallel battery; then screen the two target battery clusters and perform power adjustment. By repeating this process, the power of the abnormal battery clusters can be adjusted, and finally the power of each battery cluster tends to be the same.

[0090] In one of the embodiments, the target battery cluster may be the initial battery cluster with sufficient power or the initial battery cluster with insufficient power. In order to perform switch control for different types of abnormal initial battery clusters, among them, by way of example, the control of closing the short-circuit switch unit connected to each of the target battery clusters may include the following sub-steps:

[0091] S131. Determine the power deviation type of each of the target battery clusters, where the power deviation type is the positive or negative value type of the difference between the real-time power value and the power threshold.

[0092] S132. Control the closing of the short-circuit switch unit connected to the target battery cluster according to the power deviation type.

[0093] Since the battery cluster may be fully charged or undercharged during use. For example, the two target battery clusters selected this time are the i-th battery cluster and the j-th battery cluster. Among them, in this adjustment operation, the i-th battery cluster may be an initially fully charged battery cluster, and in the next adjustment operation, the i-th battery cluster may be an initially undercharged battery cluster.

[0094] In order to fit its actual situation, in one embodiment, each time of adjustment, the power deviation type of each target battery cluster can be determined, where the power deviation type is the positive or negative value type of the difference between the real-time power value and the power threshold.

[0095] For example, for an initially fully charged battery cluster, its power difference is a positive value; on the contrary, for an initially undercharged battery cluster, its power difference is a negative value. Then, control the closing of the short-circuit switch unit connected to the target battery cluster according to the power deviation type of each target battery cluster.

[0096] In addition, it should be noted that after calculating the power difference, if the absolute value of the power difference is smaller than a preset value, for example, the state of charge of the i-th battery cluster, the j-th battery cluster,..., the n-th battery cluster differs from the average state of charge within a very small constant range, it indicates that the power deviation of these battery clusters is small and no adjustment is required. The short-circuit switch units of these battery clusters can be directly disconnected, and these battery clusters only act as bypasses in the battery and do not perform state-of-charge equalization adjustment.

[0097] In one of the embodiments, each initial battery cluster of the parallel-connected batteries of the present invention is provided with a short-circuit switch unit, and each short-circuit switch unit can include: a first short-circuit switch and a second short-circuit switch;

[0098] Meanwhile, each initial battery cluster of the parallel-connected batteries of the present invention is connected in series with a first capacitor and a second capacitor. Among them, the initial battery cluster and the first capacitor are connected in series in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, the first capacitor is connected in parallel with the first short-circuit switch, and the second capacitor is connected in parallel with the second short-circuit switch.

[0099] Among them, by way of example, controlling the closing of the short-circuit switch unit connected to each of the target battery clusters may include the following sub-steps:

[0100] S1321. If the power deviation type is a positive type, control the second short - circuit switch of the target battery cluster to close.

[0101] S1322. If the power deviation type is a negative type, control the first short - circuit switch of the target battery cluster to close.

[0102] In an actual operation, if the power deviation type is a positive type, it indicates that the target battery cluster is an initial battery cluster with sufficient power. The second short - circuit switch of the target battery cluster can be controlled to close, and at the same time, the first short - circuit switch of the target battery cluster can be disconnected.

[0103] Similarly, if the power deviation type is a negative type, it indicates that the target battery cluster is an initial battery cluster with insufficient power. The first short - circuit switch of the target battery cluster can be controlled to close, and at the same time, the second short - circuit switch of the target battery cluster can be disconnected.

[0104] After closing the short - circuit switches corresponding to the two target battery clusters, the two target battery clusters can be connected into a conducting loop. At this time, the current of the initial battery cluster with sufficient power can charge the initial battery cluster with insufficient power to adjust the power of the two battery clusters and make the power balanced.

[0105] When adjusting the power, the power and current of the two battery clusters may be different. In order to control the transmitted current to improve the adjustment efficiency, in an embodiment, the parallel battery further includes: a converter, and the converter is connected to the short - circuit switch unit of each initial battery cluster. In actual operation, the converter can be a bidirectional DC / DC converter.

[0106] Among them, by way of example, the operation of power adjustment may include the following sub - steps:

[0107] S133. After the short - circuit switch unit is closed, determine the target current of the two target battery clusters. The target current is the corresponding current when the two target battery clusters have the same state of charge.

[0108] S134. Control the converter to adjust the real - time current of the two target battery clusters to the target current at a preset speed.

[0109] In some possible implementation manners, after the short - circuit switch unit is closed, determine the target current of the two target battery clusters. Among them, the target current can be the corresponding current when the two target battery clusters have the same state of charge. The target current adjusts the SOC of the battery cluster to the target SOC within the preset SOC range.

[0110] During specific operation, a current command required by the target battery cluster (i.e., the t-th abnormal battery cluster, where t is an integer from 1 to n) can be sent to the DC / DC converter. The DC / DC converter adjusts the current of the target battery cluster through compensating voltage regulation. The adjustment is to make the state of charge of the abnormal battery cluster approach the average state of charge at a preset specified speed as the target current.

[0111] In this embodiment, the present invention provides a method for adjusting the power of parallel-connected batteries. Its beneficial effects are as follows: The present invention can obtain the real-time power values of each initial battery cluster in the parallel-connected batteries; screen two battery clusters with different power and opposite deviation types according to the numerical sizes of multiple real-time power values, and then control the two battery clusters to form a conducting loop and perform power adjustment. Each adjustment does not need to rely on an external power supply, which can not only delay battery aging, but also improve the charge and discharge efficiency through internal battery adjustment, thereby improving the adjustment efficiency to meet the user's usage requirements.

[0112] The embodiment of the present invention also provides a device for adjusting the power of parallel-connected batteries. Refer to Figure 2 , which shows a schematic structural diagram of a device for adjusting the power of parallel-connected batteries provided by an embodiment of the present invention.

[0113] Among them, by way of example, the device for adjusting the power of the parallel-connected batteries may include:

[0114] An acquisition module 201, configured to obtain the values corresponding to the real-time state of charge of each initial battery cluster in the parallel-connected batteries, and obtain a plurality of real-time power values;

[0115] A screening module 202, configured to screen two from a plurality of initial battery clusters as target battery clusters according to the numerical sizes of the plurality of real-time power values, wherein the two target battery clusters are battery clusters with the deviations of the real-time power values from the power threshold being opposite numbers;

[0116] An adjustment module 203, configured to control the short-circuit switch units connected to each target battery cluster to close, so that the two target battery clusters form a conducting loop and perform power adjustment.

[0117] Optionally, the screening of two from a plurality of initial battery clusters as target battery clusters according to the numerical sizes of the plurality of real-time power values includes:

[0118] Calculating the average value of the plurality of real-time power values to obtain a power average value, and using the power average value as the power threshold;

[0119] Calculating the difference between each real-time power value and the power threshold to obtain a plurality of power differences;

[0120] Select the largest and smallest power differences from among the multiple power differences, and use the initial battery clusters corresponding to the largest and smallest power differences as the target battery clusters.

[0121] Optionally, controlling the closing of the short-circuit switch units connected to each of the target battery clusters includes:

[0122] Determine the power deviation type of each of the target battery clusters, where the power deviation type is the positive or negative value type of the difference between the real-time power value and the power threshold;

[0123] Control the closing of the short-circuit switch units connected to the target battery clusters according to the power deviation type.

[0124] Optionally, the short-circuit switch unit includes a first short-circuit switch and a second short-circuit switch;

[0125] Each of the initial battery clusters is connected in series with a first capacitor and a second capacitor, where the initial battery cluster and the first capacitor are connected in series in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, the first capacitor is connected in parallel with the first short-circuit switch, and the second capacitor is connected in parallel with the second short-circuit switch;

[0126] The controlling the closing of the short-circuit switch units connected to the target battery clusters according to the power deviation type includes:

[0127] If the power deviation type is a positive value type, control the second short-circuit switch of the target battery cluster to close;

[0128] If the power deviation type is a negative value type, control the first short-circuit switch of the target battery cluster to close.

[0129] Optionally, the parallel battery further includes: a converter, which is connected to the short-circuit switch units of each initial battery cluster;

[0130] The operation of power adjustment includes:

[0131] After the short-circuit switch units are closed, determine the target currents of the two target battery clusters, where the target current is the corresponding current when the two target battery clusters have the same state of charge;

[0132] Control the converter to adjust the real-time currents of the two target battery clusters to the target current at a preset speed.

[0133] The embodiments of the present invention also provide a power adjustment system for a parallel battery. Refer to Figure 3 , which shows a schematic structural diagram of a power adjustment system for a parallel battery provided by an embodiment of the present invention.

[0134] Among them, by way of example, the power adjustment system of the parallel-connected battery may include: a control circuit and parallel-connected batteries, and the control circuit is applicable to the power adjustment method of the parallel-connected battery as described in the above embodiments.

[0135] In an operation mode, the control circuit may obtain the real-time power values of each initial battery cluster in the parallel-connected battery; determine the target battery cluster that needs to be adjusted according to the real-time power values; and at the same time, close the short-circuit switch units connected to each target battery cluster, so that two target battery clusters form a conducting loop and perform power adjustment.

[0136] In the art, one method for adjusting the power of each battery cluster in the parallel-connected battery is: connecting a DC converter in series on each battery cluster, and controlling the voltage of the DC converter connected in series on the battery cluster to control the current of the battery cluster. The other ports of all DC converters are connected in series to form a low-voltage DC port, all cluster branches are connected in parallel to form a high-voltage DC port, and the two ports are connected in series to form a system DC port. The current flowing through the low-voltage DC port is the sum of the currents of all cluster branches, and it is necessary to rely on the operation of the converter to distribute the currents of each cluster branch to achieve the purpose of controllable current distribution.

[0137] However, the above method has the following technical problems: during the adjustment process, it is necessary to keep all DC converters in the working state continuously to control the currents of each cluster branch. And the DC converter needs to consume the power of the battery cluster, increasing the battery loss, and further reducing the available capacity of the battery system. Moreover, setting a converter for each battery cluster increases the battery cost.

[0138] To solve the above problems, the embodiments of the present invention also provide a parallel-connected battery. Refer to Figure 4 which shows the circuit schematic diagram of a parallel-connected battery provided by an embodiment of the present invention.

[0139] Among them, by way of example, the parallel-connected battery may include: a plurality of initially parallel-connected battery clusters, a plurality of first capacitors, a plurality of second capacitors, a plurality of first short-circuit switches, and a plurality of second short-circuit switches.

[0140] Corresponding to Figure 4 , the plurality of initially parallel-connected battery clusters include: B1, B2... BN. The plurality of first capacitors include: C11, C21... CN1. The plurality of second capacitors include: C12, C22... CN2. The plurality of first short-circuit switches include: M11, M21... MN1. The plurality of second short-circuit switches include: M12, M22... MN2.

[0141] Each of the initial battery clusters is connected in series with the first capacitor in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, each of the first capacitors is connected in parallel with a first short - circuit switch, and each of the second capacitors is connected in parallel with a second short - circuit switch.

[0142] Referring Figure 4 , in one embodiment, the parallel battery further includes: a converter;

[0143] The first end of the converter is connected in parallel with each of the first capacitors;

[0144] The second end of the converter is connected in parallel with each of the second capacitors.

[0145] Among them, the converter can be a DC / DC converter.

[0146] Referring Figure 4 , in one embodiment, the parallel battery further includes: a first gating switch and a second gating switch;

[0147] The first end of the converter is connected in parallel with each of the first capacitors through the first gating switch;

[0148] The second end of the converter is connected in parallel with each of the second capacitors through the second gating switch.

[0149] Corresponding Figure 4 , the first gating switch is the gating switch network 1, and the second gating switch is the gating switch network 2.

[0150] Specifically, referring Figure 4 , the control circuit can detect and compare the state of charge of different battery clusters in real time; when it is found that the state of charge between the battery clusters is unbalanced, the control circuit generates the current reference values required for different parallel battery clusters to maintain the state of charge balance through control, and then selects the unbalanced battery cluster gating network, and transfers the power of some parallel circuits to other parallel circuits through the DC converter between the gating networks, so as to realize the balanced control of the state of charge of each battery cluster.

[0151] Referring Figure 5 , shows the control operation flow chart of a parallel battery provided by an embodiment of the present invention. The control circuit detects the state of charge of the battery clusters, compares the state of charge of each battery cluster and takes the average value. If at this time the state of charge of the i - th battery cluster, the j - th battery cluster,..., the n - th battery cluster differs from the average state of charge within a very small constant range, then the load short - circuit switches M i1 、M i2 corresponding to these battery clusters are turned on to realize bypass, and the charge state balance of this parallel circuit is not performed.

[0152] If the state of charge of Y (Y < N) battery clusters such as i, j, and k at this time and the state of charge of other battery clusters deviate from the average state of charge by more than the range, the polarity of the output voltage of the corresponding series capacitor is controlled according to the magnitude relationship between the current reference value and the actual output current value of the battery cluster. The controller samples and selects the battery cluster with the highest degree of imbalance as the first abnormal battery cluster. According to the positive and negative of the load imbalance difference, if it is greater than the average state of charge, the load short-circuit switch M of the negative selection network is turned off i2 , and the negative selection network is connected; if it is less than the average state of charge, the load short-circuit switch M of the positive selection network is turned off i1 , and the positive selection network is connected. The series compensation capacitor of the battery cluster is connected to the selection network for charge compensation, so as to control the power flow direction between the parallel circuits. Part of the power of the parallel circuits is transmitted to other parallel circuits through the bidirectional DC / DC converter, realizing the state of charge balance of the first abnormal battery cluster. After the control of the first abnormal battery cluster is completed, among the remaining Y - 1 unbalanced battery clusters, the battery cluster with the largest difference between the state of charge and the reference is selected as the second abnormal battery cluster and connected to the compensation network for control, and so on until dynamic balance is achieved

[0153] Refer to Figure 6 , which shows a diagram of the state of charge balance current reference value distribution principle of a parallel battery provided by an embodiment of the present invention. Assume that the output current reference value I refi for the state of charge balance of the battery cluster and the absolute value of the deviation of the actual current I i feedback value is ΔI. At this time, if the actual value of the state of charge of the i-th battery cluster is greater than the average state of charge, in order to reduce the state of charge of the i-th battery cluster and increase its discharge current, the bidirectional converter is connected to the positive selection network to control the series capacitor voltage to be positive; otherwise, the bidirectional converter is connected to the negative selection network to control the series capacitor voltage to be negative

[0154] Suppose that the state of charge of the first battery cluster and the state of charge of other battery clusters deviate from the average state of charge by more than the range. The first battery cluster is an abnormal battery cluster, and the first target battery cluster is obtained. At this time, the first battery cluster is connected to the selection network, and the k-th battery cluster is used as the compensation reference. The k-th battery cluster is one of the remaining n - 1 parallel battery clusters except the first battery cluster, satisfying the selection condition of the largest difference in the state of charge from the first battery cluster, and the second target battery cluster is obtained. At this time, the corresponding switches of the first battery cluster and the k-th battery cluster connected to the DC / DC converter on the switch selection network 1 and the switch selection network 2 are closed. The first battery cluster and the second battery cluster are used as both sides of the compensation selection network to compensate the first battery cluster

[0155] It should be noted that if the state of charge of the first abnormal battery cluster is greater than the average state of charge, the load short-circuit switch M of the negative selection network is closed i2, turn off the load short - circuit switch M of the positive gating network i1 , connect to the negative gating network; if the first abnormal battery cluster is lower than the average state - of - charge, close the load short - circuit switch M of the positive gating network i1 , turn off the load short - circuit switch M of the negative gating network i2 , connect to the positive gating network so that the first abnormal battery cluster transmits electrical energy through the converter

[0156] In some possible embodiments, after the equalization of the first battery cluster is completed, the equalization control of the second abnormal battery cluster is performed in a similar manner. The DC / DC converter is gated to connect the second abnormal battery cluster and the corresponding compensated reference battery cluster, and the SOC of the second abnormal battery cluster is adjusted to the preset SOC range. The specific operations include: sending the current command required by the t - th abnormal battery cluster to the DC / DC converter, where t is an integer from 1 to n. The DC / DC converter adjusts the current of the abnormal battery cluster through the compensation voltage regulation to the target current that makes the state - of - charge of the abnormal battery cluster approach the average state - of - charge at a specified speed, and the target current adjusts the SOC of the battery cluster to the target SOC in the preset SOC range

[0157] In actual operation, when there is an imbalance in current or state - of - charge between different parallel battery clusters, the control circuit can enter the gating network according to the control instruction, and through the bidirectional DC / DC converter, realize the suppression of the circulating current between each battery cluster and the equalization control of the state - of - charge

[0158] In the case where there are abnormal battery clusters in the battery cluster, by gating the corresponding abnormal battery clusters to access the DC / DC converter through the control circuit, the multiple abnormal battery clusters in the battery system can be gradually adjusted to ensure the capacity and performance of the energy storage system. In some possible embodiments, the control circuit controls the target DC / DC converter to adjust the electrical parameters of at least two abnormal battery clusters in sequence according to the difference between the electrical parameters of at least two abnormal battery clusters and the preset threshold. This embodiment can further improve the adjustment performance of the battery for multiple abnormal battery clusters, which is beneficial to ensuring the safety of the energy storage system

[0159] It should be noted that the DC / DC converter can generate an output voltage based on the input voltage and the target current, and then adjust the electrical parameters of the battery cluster in series with it, so that the DC / DC converter can adjust the target SOC of the corresponding two battery clusters, and effectively and reliably adjust the N battery clusters. Therefore, by using the DC / DC converter to adjust the conversion of the unbalanced SOC of the battery cluster, the adjustment performance of the consistent power output of all parallel battery clusters can be ensured

[0160] Furthermore, the power source of the DC / DC converter is any battery cluster to be regulated among the N battery clusters. Without the need for an additional power source, on the basis of ensuring the regulation effect on the N battery clusters, the system cost of the energy storage system can be reduced. Through the technical solution of this embodiment, the voltage and SOC of the battery cluster can more accurately reflect the state of the battery cluster during charge and discharge, and are easy to be monitored by other electrical components, such as BMS or BMU, etc.

[0161] Compared with the prior art, the present invention integrates a gating network for circulating current suppression and state of charge equalization, and can dynamically regulate the parallel-connected battery clusters of the circuit, better realizing circulating current suppression and state of charge equalization of the parallel-connected battery clusters.

[0162] Through the control adjustment of the gating network, the present invention can control and achieve the equalization state between any two battery clusters, without excessive standby of the converter. At the same time, by expanding the number of battery clusters through the gating network, the number of converters in the equalization circuit is reduced, the cost is saved, and the control efficiency is greatly improved.

[0163] Moreover, by controlling the circuit to gate the access of the corresponding abnormal battery cluster to the DC / DC converter and using the compensation battery cluster to regulate the abnormal battery cluster, the equalization regulation of multiple abnormal battery clusters in the battery system can be gradually realized to ensure the available capacity of the system and facilitate the safe operation of the battery system.

[0164] Those skilled in the art can clearly understand that for the convenience of description and simplicity, the specific working process of the above-described device can refer to the corresponding process in the foregoing method embodiment, and will not be elaborated herein.

[0165] Furthermore, an embodiment of the present application also provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method for regulating the power of parallel-connected batteries as described in the above embodiment.

[0166] Furthermore, an embodiment of the present application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer-executable program, and the computer-executable program is used to cause a computer to execute the method for regulating the power of parallel-connected batteries as described in the above embodiment.

[0167] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. When an element such as a layer, region or substrate is referred to as "on" or "above" another element, it can be directly on the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly on" or "above" another element, there is no intermediate element. It should also be understood that when an element is referred to as "under" or "below" another element, it can be directly under or below the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly under" or "below" another element, there is no intermediate element. Unless otherwise clearly defined and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0168] Those skilled in the art should understand that embodiments of the present application may also provide a computer program product. Therefore, the present application may be implemented in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application may be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0169] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), devices and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0170] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one or more of the processes and / or blocks Figure 1 in one or more of the processes and / or blocks Figure 1 specified in the block or blocks.

[0171] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more of the processes and / or blocks Figure 1 in one or more of the processes and / or blocks Figure 1 specified in the block or blocks.

[0172] The foregoing is only a preferred embodiment of the present invention, and it should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for adjusting the power of a parallel battery, characterized in that, The parallel battery includes a plurality of initially connected battery clusters connected in parallel, and the method includes: Obtaining the values corresponding to the real-time state of charge of each initially connected battery cluster in the parallel battery to obtain a plurality of real-time power values; Selecting two from the plurality of initially connected battery clusters as target battery clusters according to the numerical magnitudes of the plurality of real-time power values, wherein the two target battery clusters are battery clusters with opposite signs of the deviation between the real-time power value and the power threshold; Controlling the short-circuit switch unit connected to each target battery cluster to close, so that the two target battery clusters form a conducting loop and perform power adjustment.

2. The method for adjusting the power of the parallel-connected battery according to claim 1, wherein The step of selecting two from the plurality of initially connected battery clusters as target battery clusters according to the numerical magnitudes of the plurality of real-time power values includes: Calculating the average value of the plurality of real-time power values to obtain an average power value, and using the average power value as the power threshold; Calculating the difference between each real-time power value and the power threshold to obtain a plurality of power differences; Selecting the largest and smallest power differences from the plurality of power differences, and using the initially connected battery clusters corresponding to the largest and smallest power differences as the target battery clusters.

3. The method for adjusting the power of the parallel-connected batteries according to claim 1, wherein The step of controlling the short-circuit switch unit connected to each target battery cluster to close includes: Determining the type of power deviation of each target battery cluster, where the type of power deviation is the positive or negative type of the difference between the real-time power value and the power threshold; Controlling the short-circuit switch unit connected to the target battery cluster to close according to the type of power deviation.

4. The method for adjusting the power of the parallel-connected battery according to claim 3, characterized in that, The short-circuit switch unit includes a first short-circuit switch and a second short-circuit switch; Each initially connected battery cluster is connected in series with a first capacitor and a second capacitor, wherein the initially connected battery cluster and the first capacitor are connected in series in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, the first capacitor is connected in parallel with the first short-circuit switch, and the second capacitor is connected in parallel with the second short-circuit switch; The step of controlling the short-circuit switch unit connected to the target battery cluster to close according to the type of power deviation includes: If the type of power deviation is a positive type, controlling the second short-circuit switch of the target battery cluster to close; If the type of power deviation is a negative type, controlling the first short-circuit switch of the target battery cluster to close.

5. The method for adjusting the power of the parallel-connected battery according to claim 1, wherein The parallel battery further includes: a converter, which is connected to the short-circuit switch unit of each initially connected battery cluster; The operation of the power adjustment includes: Determining the target current of the two target battery clusters after the short-circuit switch unit is closed, where the target current is the corresponding current when the two target battery clusters have the same state of charge; Controlling the converter to adjust the real-time current of the two target battery clusters to the target current at a preset speed.

6. A power adjustment device for a parallel battery, characterized in that The parallel battery includes a plurality of initially connected battery clusters connected in parallel, and the device includes: An acquisition module for obtaining the values corresponding to the real-time state of charge of each initially connected battery cluster in the parallel battery to obtain a plurality of real-time power values; A screening module, configured to screen two from multiple initial battery clusters according to the numerical magnitudes of multiple said real-time power values, wherein the two said target battery clusters are battery clusters with opposite numbers of deviations between the real-time power values and the power threshold; An adjustment module, configured to control the closing of the short-circuit switch units connected to each of the said target battery clusters, so that the two said target battery clusters form a conducting loop and perform power adjustment.

7. A power adjustment system for a parallel battery, characterized in that, The system includes: a control circuit and parallel-connected batteries, and the control circuit is applicable to the power adjustment method of the parallel-connected batteries according to any one of claims 1-5.

8. A parallel battery, characterized in that, The parallel-connected batteries include: multiple initially parallel-connected battery clusters, multiple first capacitors, multiple second capacitors, multiple first short-circuit switches, and multiple second short-circuit switches; Each of the said initial battery clusters is connected in series with the first capacitor in the same direction, the first capacitor and the second capacitor are connected in series in the opposite direction, each of the first capacitors is connected in parallel with a first short-circuit switch, and each of the second capacitors is connected in parallel with a second short-circuit switch.

9. The parallel battery according to claim 8, wherein, The parallel-connected batteries further include: a converter; The first end of the converter is connected in parallel with each of the first capacitors; The second end of the converter is connected in parallel with each of the second capacitors.

10. The parallel battery according to claim 9, characterized in that, The parallel-connected batteries further include: a first selection switch and a second selection switch; The first end of the converter is connected in parallel with each of the first capacitors through the first selection switch; The second end of the converter is connected in parallel with each of the second capacitors through the second selection switch.

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