Energy storage device charging control system and energy storage device charging control circuit

Abstract

The utility model relates to an energy storage device charging control system and an energy storage device charging control circuit. The energy storage device charging control system is used for controlling a plurality of batteries in an energy storage device to perform voltage equalization before the energy storage device is conducted with the outside, so that the voltage deviation of any two batteries in the plurality of batteries does not exceed a preset threshold value; comprising a voltage balancing module which is connected with a plurality of batteries and is used for collecting the voltage of all the batteries and controlling the batteries with high voltage to charge the batteries with low voltage so as to carry out voltage balancing; the voltage balancing module comprises an electric control switch unit which is connected with the multiple batteries in a matched mode and used for controlling the high-voltage batteries and the low-voltage batteries to be connected to form a conductive circuit. According to the utility model, the voltage of each battery is close to the level, thereby improving the charging efficiency and prolonging the service life of the battery.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage batteries, and in particular to a charging control system and a charging control circuit for an energy storage device. Background Art

[0002] my country's coal resources are mainly distributed in the western and northern regions, while hydropower resources are mainly concentrated in the southwest. The primary energy resources in the eastern region are scarce and the electricity load is relatively concentrated. The imbalance in the distribution of energy resources and electricity load determines the necessity of sending electricity from the west to the east. "Sending electricity from the west to the east" means converting the energy of the western provinces with rich coal and hydropower resources into electricity resources and transmitting them to the eastern coastal areas with electricity shortages.

[0003] In the prior art, peak cut is a measure to adjust the power load. According to the power consumption patterns of different users, the power consumption time of various users is reasonably and planned to reduce the peak load and fill the load valley. The peak-to-valley difference of the power grid load is reduced to balance the power generation and power consumption. Energy storage devices are one of the important means to achieve peak cut and valley filling. During the peak power consumption, the electric energy stored in the energy storage battery is supplied to the load for use; during the trough power consumption, the abundant electric energy of the municipal power grid is stored in the energy storage battery.

[0004] However, in order to better achieve peak shaving and valley filling, the battery capacity in the energy storage device is getting larger and larger. Generally, multiple batteries are connected in parallel or series to supply power to the outside. Since the discharge power of each battery is inconsistent, the remaining power and voltage of each battery are inconsistent. When charging in the municipal power grid, since the grid charges all batteries at the same time, the inconsistent battery voltage causes the charging efficiency to decrease and the charging loss to increase. Utility Model Content

[0005] Based on this, it is necessary to provide a charging control system and a charging control circuit for an energy storage device that can control the charging and discharging of batteries so that the voltages between batteries are similar, thereby improving the charging efficiency and extending the battery life, in order to address the above technical problems.

[0006] In a first aspect, the present application provides a charging control system for an energy storage device, wherein the energy storage device comprises a plurality of battery clusters, including:

[0007] a voltage balancing module connected to all the battery clusters and capable of acquiring the voltage of each battery cluster, wherein the battery balancing module outputs a control signal according to the voltage difference between any two battery clusters; and

[0008] A plurality of electronically controlled switch units, corresponding to a plurality of said battery clusters;

[0009] Among them, the first end of each battery cluster is connected to the first node through the corresponding electronically controlled switch unit, and the second end is connected to the second node; each electronically controlled switch unit is switched on and off in response to the control signal to achieve a balance between high voltage and low voltage between each battery cluster.

[0010] In one embodiment, the voltage balancing module includes:

[0011] A sampling unit, used for acquiring the voltage of each of the battery clusters;

[0012] The control unit is connected to the sampling unit and is used to group the battery clusters according to the acquired voltages and control the on and off of the electric control switch unit to achieve a balance between high voltage and low voltage among the battery clusters.

[0013] In one of the embodiments, the control unit includes a dividing unit, a comparing unit and a charging control unit;

[0014] The comparison unit is connected to the sampling unit and is used to obtain the voltage of each battery cluster and determine the order of each battery by sorting the voltage of each battery cluster;

[0015] The division unit is connected to the comparison unit and is used to group and determine each battery group according to the order of each battery cluster and a preset division scheme;

[0016] The charging control unit is used to control one battery cluster in each battery group to charge another battery cluster, and to control each battery group to perform voltage balancing.

[0017] In one embodiment, the charging control system further includes a conduction module. After all the battery clusters complete voltage balancing, the energy storage device is connected to the conduction module and is conducted to the outside through the conduction module.

[0018] In one embodiment, the battery control system further includes a conversion module, which is connected to the conduction module and is used to convert the direct current provided by the energy storage device into alternating current to supply the outside world or to convert the alternating current provided by the outside world into direct current to supply the energy storage device.

[0019] In one embodiment, the conduction module includes a relay, and the conversion module includes a bidirectional inverter;

[0020] or,

[0021] The conduction module includes a main positive relay and a main negative relay, the conversion module includes a bidirectional inverter, the main positive relay is arranged on a main positive bus and the main negative relay is arranged on a main negative bus, the main positive bus and the main negative bus connect the bidirectional inverter and the energy storage device.

[0022] In one of the embodiments, the preset division scheme includes the number of battery clusters in each battery group, and the number of battery clusters in each battery group is set to two;

[0023] When the total number of battery clusters is an odd number, the last battery cluster is separately divided into a battery group.

[0024] In a second aspect, the present application also provides an energy storage device charging control circuit, which is applicable to the energy storage device charging control system described in any one of the above.

[0025] In one embodiment, the energy storage device control circuit further includes a conversion module and a conduction module, the first end of the conversion module is conducted to the outside, the second end of the conversion module is connected to the first end of the conduction module, and the first node and the second node are connected to the second end of the conduction module.

[0026] In one of the embodiments, the conversion module includes a bidirectional inverter, and the conduction module includes a relay;

[0027] or,

[0028] The conversion module includes a bidirectional inverter, and the conduction module includes a main positive relay and a main negative relay. The first side of the bidirectional inverter is conducted to the outside world, the first end of the second side of the bidirectional inverter is connected to the first end of the main positive relay, the second end of the second side of the bidirectional inverter is connected to the first end of the main negative relay, the first node is connected to the second end of the main positive relay, and the second node is connected to the second end of the main negative relay.

[0029] The energy storage device charging control system and energy storage device charging control circuit collect the voltage of the battery cluster in the energy storage device through the voltage equalization control module and sort them according to the voltage. According to the preset battery cluster grouping strategy, the battery clusters are grouped to obtain battery groups. The voltage equalization control module controls the high-voltage batteries in the battery group to charge the low-voltage batteries. Then, the voltage equalization control between the battery groups is performed, so that the difference between the batteries is within the preset reasonable range, which can make the voltage of each battery in the energy storage unit close to the level, thereby improving the charging efficiency and extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] FIG1 is a schematic diagram of the structure of a charging control system for an energy storage device in one embodiment;

[0032] FIG2 is a schematic diagram of the structure of a voltage equalization module in one embodiment;

[0033] FIG3 is a schematic diagram of the structure of an energy storage device charging control system in another embodiment;

[0034] FIG4 is a schematic diagram of the structure of a charging control circuit for an energy storage device in one embodiment;

[0035] FIG. 5 is a schematic diagram of the structure of a charging control circuit for an energy storage device in another embodiment.

[0036] Description of reference numerals:

[0037] Bidirectional inverter-10, relay-20, voltage balancing module-30, energy storage device-40, electronically controlled switch unit-50;

[0038] Main positive relay - 210, main negative relay - 220;

[0039] Sampling unit-310, control unit-320;

[0040] The first electrically controlled switch K1, the second electrically controlled switch K2, the third electrically controlled switch K3, the fourth electrically controlled switch K4, the fifth electrically controlled switch K5, the sixth electrically controlled switch K6, the first double-control switch K1', the second double-control switch K2', the third double-control switch K3', the fourth double-control switch K4', the fifth double-control switch K5', the first single-control switch K7, the second single-control switch K8, the third single-control switch K9, the first four single-control switches K10, the fifth single-control switch K11, and the sixth single-control switch K12. DETAILED DESCRIPTION

[0041] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0043] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0044] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0045] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0046] FIG1 is a schematic diagram of the structure of a charging control system for an energy storage device according to an embodiment of the present invention. As shown in FIG1 , an energy storage device 40 includes a plurality of battery clusters. The charging control system for the energy storage device includes a voltage balancing module 30 and a plurality of electronically controlled switch units 50. The voltage balancing module 30 is also connected to all battery clusters and can obtain the voltage of each battery cluster. The battery balancing module outputs a control signal according to the voltage difference between two battery clusters; and a plurality of electronically controlled switch units respond to the plurality of battery clusters; wherein the first end of each battery cluster is connected to a first node through the corresponding electronically controlled switch unit, and the second end is connected to a second node; each electronically controlled switch unit is switched on and off in response to the control signal to achieve a balance between high voltage and low voltage between each battery cluster.

[0047] The energy storage device charging control system further includes a conversion module and a conduction module. The conversion module is connected to the conduction module. The conduction module is connected to the energy storage device 40 and is conducted to the outside through the conduction module.

[0048] The conversion module includes a bidirectional inverter 10, and the conduction module includes a relay 20. The bidirectional inverter 10 is connected to the relay 20, and the relay 20 is also connected to the voltage balancing module 30. Specifically, the voltage balancing module 30 obtains the voltage of each battery cluster in the energy storage device 40, and then sorts them according to the voltage values ​​in the voltage cluster. After the sorting is completed, the battery clusters in the energy storage device 40 are grouped according to the sequence and the preset division scheme. Among them, two battery clusters with adjacent voltage values ​​can be set as a group; if the number of battery clusters is an odd number, the last battery cluster is divided into a group separately.

[0049] After the grouping is completed, each battery group is balanced and controlled, and the electronically controlled switch unit connected to a battery group is adjusted so that the two battery clusters in the battery group are set in parallel until the voltage difference between the two battery clusters is within the error threshold of the rated battery, for example, the error threshold of the two battery clusters is 10% of the rated voltage value, preferably not more than 3%.

[0050] After completing the voltage equalization operation in the battery pack, the electronically controlled switches connected to the two battery packs are controlled so that one battery pack charges the other battery pack, so that the voltages of the two battery packs are the same or similar. The voltage values ​​of any two battery clusters are less than the error threshold, which is generally no more than 10% of the voltage of the battery cluster when it is fully charged, and preferably no more than 3%.

[0051] In this embodiment, the voltage of the battery cluster in the energy storage unit is collected by the voltage balancing control module and sorted according to the voltage. According to the preset battery grouping strategy, the battery clusters are grouped to obtain battery groups, and the voltage balancing control chip controls the high-voltage battery cluster in the battery group to charge the low-voltage battery cluster, and then performs voltage balancing control between the battery groups, so that the difference between the battery clusters is within a preset reasonable range, which can make the voltage of each battery cluster in the energy storage unit close to the level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0052] FIG2 is a schematic diagram of the structure of a voltage equalization module according to an embodiment of the present invention. As shown in FIG2 , the voltage equalization module includes a sampling unit 310 and a control unit 320. The sampling unit 310 is connected to the control unit 320, and the sampling unit 310 is also connected to all battery clusters. The electric control switch unit 330 is connected to the battery cluster, and the electric control switch unit 330 is connected to the control unit 320.

[0053] Exemplarily, the sampling unit 310 collects the voltage of each battery cluster and transmits the collected voltage value of each battery cluster to the control unit 320. The control unit 320 sorts the battery clusters according to the voltage value, and then divides the sorted battery clusters to obtain divided battery groups.

[0054] In this embodiment, the voltage of multiple battery clusters in the energy storage device is collected by the voltage balancing control module and sorted according to the voltage. According to the preset battery grouping strategy, the battery clusters are grouped to obtain battery groups, which is conducive to controlling the voltage balancing operation within the battery group and between the battery groups.

[0055] In an exemplary embodiment, the control unit includes a dividing unit, a comparing unit and a charging control unit. The comparing unit is connected to the sampling unit, and the dividing unit is connected to the comparing unit.

[0056] Exemplarily, after the control unit obtains the voltage of the battery cluster, it sorts the battery clusters according to the voltage value of each battery cluster. The control unit groups the sorted battery clusters into groups of two to obtain battery groups, each of which includes two battery clusters with adjacent voltage values.

[0057] In this embodiment, the voltage of multiple battery clusters in the energy storage device is collected by the voltage balancing control chip and sorted according to the voltage value. According to the preset battery grouping strategy, the battery clusters are grouped to obtain battery groups, which is conducive to reasonable control of the voltage balancing operation within the battery group and between the battery groups.

[0058] Figure 3 is a structural schematic diagram of an energy storage device charging control system according to an embodiment of the utility model. As shown in Figure 3, the conversion module includes a bidirectional inverter 10, and the conduction module includes a main positive relay 210 and a main negative relay 220. The main positive relay 210 is arranged on a main positive bus and the main negative relay 220 is arranged on a main negative bus. The main positive bus and the main negative bus connect the bidirectional inverter 10 and the energy storage device 40.

[0059] Exemplarily, the output end of the bidirectional inverter 10 is connected to a main positive bus and a main negative bus, a main positive bus and a main negative bus, a main positive relay 210 is arranged on the main positive bus, and a main negative relay 220 is arranged on the main negative bus. When charging is required, the main positive relay 210 and the main negative relay 220 need to be closed.

[0060] In this embodiment, a main positive bus and a main negative bus are provided, and a main positive relay and a main negative relay are provided on the main positive bus and the main negative bus respectively.

[0061] In an exemplary embodiment, multiple battery clusters are connected in series, including a head-end battery cluster, a tail-end battery cluster and an intermediate battery cluster, the positive terminal of the head-end battery cluster is connected to the main positive relay, and the negative terminal of the tail-end battery cluster is connected to the negative positive relay.

[0062] Exemplarily, the battery clusters are arranged to be connected in series, and the voltage balancing module controls the switches in the electronically controlled switch group according to the sorted battery clusters, so that each battery group and the bidirectional inverter form a charging circuit. Then, after each battery group completes the voltage balancing operation, the voltage balancing module controls the two adjacent battery groups that have completed the voltage balancing in the group to form a charging circuit with the bidirectional inverter. This continues until the voltages of all battery clusters are the same, or the voltage difference between any two battery clusters is within a reasonable range.

[0063] In this embodiment, the voltage balancing module controls the electronically controlled switch units connected to the battery clusters so that a charging circuit is formed between adjacent battery clusters or adjacent battery groups, so that the difference between the battery clusters is within a preset reasonable range, and the voltages of the battery clusters in the energy storage device are at a similar level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0064] In an exemplary embodiment, a plurality of battery packs are connected in parallel, a positive terminal of each battery pack is connected to a main positive relay, and a negative terminal of each battery pack is connected to a main negative relay.

[0065] Exemplarily, the battery clusters are arranged to be connected in parallel, and the voltage balancing module controls the on and off of the electronically controlled switch unit according to the sorted battery clusters, so that a charging circuit is formed between each battery group. Then, after each battery group completes the voltage balancing operation, the voltage balancing module controls the two adjacent battery groups that have completed the voltage balancing in the group to form a charging circuit with the bidirectional inverter. This continues until the voltages of all battery clusters are the same, or the voltage difference between any two batteries is within a reasonable range.

[0066] In this embodiment, the voltage balancing module controls the on and off of the electronically controlled switch units connected to the battery clusters so that a charging circuit is formed between adjacent battery clusters or adjacent battery groups, so that the difference between the battery clusters is within a preset reasonable range, and the voltages of the battery clusters in the energy storage device can be at a similar level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0067] A charging control circuit for an energy storage device according to an embodiment of the utility model comprises a bidirectional inverter, a relay, a voltage balancing module and an energy storage device, wherein the relay comprises a main positive relay and a main negative relay; a first end of the bidirectional inverter is connected to a first end of the main positive relay, a second end of the bidirectional inverter is connected to a first end of the main negative relay, a second end of the main positive relay is connected to a first end of an input side of the voltage balancing module, a second end of the main negative relay is connected to a second end of an input side of the voltage balancing module, and an output side of the voltage balancing module is connected to the energy storage device.

[0068] Exemplarily, the main positive electrode of the energy storage device is connected to the main positive bus, and the main positive and negative electrodes of the energy storage device are connected to the main negative bus. The voltage balancing module collects the voltage of each battery in the energy storage device, sorts them according to the voltage value, and then combines them in pairs according to the voltage value sorting to obtain each battery group. Then the two battery clusters in each battery group and the bidirectional inverter form a charging circuit so that the high-voltage battery cluster charges the low-voltage battery cluster. After that, the two adjacent battery groups in each battery group and the bidirectional inverter form a charging circuit so that one battery group charges another battery group. Until the voltage of all battery clusters in the energy storage device is the same, or the voltage difference between any two battery clusters is within a reasonable range.

[0069] In this embodiment, the voltage of multiple battery clusters in the energy storage device is collected by the voltage balancing control chip and sorted according to the voltage. According to the preset battery grouping strategy, the battery clusters are grouped to obtain battery groups, and the voltage balancing control chip controls the high-voltage battery cluster in the battery group to charge the low-voltage battery cluster, and then performs voltage balancing control between the battery groups, so that the difference between the batteries is within a preset reasonable range, which can make the voltage of each battery cluster in the energy storage device close to the level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0070] FIG4 is a schematic diagram of the structure of a charging control circuit of an energy storage device according to an embodiment of the present utility model. As shown in FIG4 , the energy storage device includes a plurality of battery clusters, the voltage balancing module includes an electronically controlled switch unit, the battery clusters are arranged in parallel, the positive terminal of each battery cluster is respectively connected to the second end of an electronically controlled switch in the electronically controlled switch unit, the first end of each electronically controlled switch is connected to the second end of the main positive relay, and the negative terminal of the battery cluster is connected to the second end of the main negative relay.

[0071] Exemplarily, when voltage balancing is required, the voltage balancing module selects a battery pack and then controls the electric control switch connected to the battery cluster in the battery pack to close, so that the battery cluster in the battery pack and the bidirectional inverter form a charging circuit.

[0072] For example, if the voltage of the battery cluster 4 is higher than that of the battery cluster 2 , the voltage balancing module controls the fourth electronically controlled switch K4 and the second electronically controlled switch K2 to close, so that the high-voltage battery cluster 4 can charge the low-voltage battery cluster 2 .

[0073] In this embodiment, the voltage balancing control chip is used to control the high-voltage battery cluster in the battery pack to charge the low-voltage battery cluster, and then the voltage balancing control is performed between the battery groups, so that the difference between the battery clusters is within a preset reasonable range, and the voltage of each battery cluster in the energy storage device can be at a close level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0074] Figure 5 is a structural schematic diagram of a charging control circuit of an energy storage device according to another embodiment of the utility model. As shown in Figure 3, the energy storage device includes a plurality of battery clusters, the voltage balancing module includes an electronically controlled switch unit, the battery clusters are sequentially arranged in series, the plurality of battery clusters include a head-end battery cluster, a tail-end battery cluster and an intermediate battery cluster, the first end of the head-end battery cluster is connected to the second end of the main positive relay, the second end of the tail-end battery cluster is connected to the second end of the main negative relay, a double-control switch is arranged between adjacent battery clusters, and the second end of each battery cluster is connected to a single-control switch.

[0075] The first end of each double-control switch is connected to the second end of the previous battery cluster, the second end of each double-control switch is connected to the first end of the next battery cluster, and the third end of each double-control switch is connected to the second end of the main positive relay.

[0076] The second end of each battery cluster is connected to the first end of the corresponding single-control switch, and the second ends of each single-control switch are connected to each other.

[0077] Exemplarily, when voltage balancing is required, the voltage balancing module selects a battery pack and then controls the double-control switch and the single-control switch connected to the battery cluster in the battery pack to close, so that the battery cluster in the battery pack and the bidirectional inverter form a charging circuit.

[0078] For example, if the voltage value of the battery cluster 4 is higher than the voltage value of the battery cluster 2, the voltage balancing module controls the second end and the third end of the first double-control switch K1' to be connected and the second end and the third end of the third double-control switch K1' to be connected, and controls the second single-control switch K2 and the fourth single-control switch K4 to be closed, so that the high-voltage battery cluster 4 can charge the low-voltage battery cluster 2.

[0079] In this embodiment, the voltage balancing control module is used to control the high-voltage battery cluster in the battery pack to charge the low-voltage battery cluster, and then the voltage balancing control is performed between the battery groups, so that the difference between the battery clusters is within a preset reasonable range, and the voltage of each battery cluster in the energy storage device can be at a close level, thereby improving the charging efficiency and extending the service life of the battery cluster.

[0080] In the description of this specification, the descriptions with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A charging control system for an energy storage device, wherein the energy storage device comprises a plurality of battery clusters, characterized in that: include: A voltage balancing module is connected to all the battery clusters and is capable of acquiring the voltage of each battery cluster. The battery balancing module outputs a control signal according to the voltage difference between any two battery clusters. as well as A plurality of electronically controlled switch units, corresponding to a plurality of said battery clusters; Among them, the first end of each battery cluster is connected to the first node through the corresponding electronically controlled switch unit, and the second end is connected to the second node; each electronically controlled switch unit is switched on and off in response to the control signal to achieve a balance between high voltage and low voltage between each battery cluster.

2. The energy storage device charging control system according to claim 1, characterized in that: The voltage balancing module comprises: A sampling unit, used for acquiring the voltage of each of the battery clusters; The control unit is connected to the sampling unit and is used to group the battery clusters according to the acquired voltages and control the on and off of the electric control switch unit to achieve a balance between high voltage and low voltage among the battery clusters.

3. The energy storage device charging control system according to claim 2, characterized in that: The control unit includes a dividing unit, a comparing unit and a charging control unit; The comparison unit is connected to the sampling unit and is used to obtain the voltage of each battery cluster and determine the order of each battery by sorting the voltage of each battery cluster; The division unit is connected to the comparison unit and is used to group and determine each battery group according to the order of each battery cluster and a preset division scheme; The charging control unit is used to control one battery cluster in each battery group to charge another battery cluster, and to control each battery group to perform voltage balancing.

4. The energy storage device charging control system according to claim 1, characterized in that: The charging control system further comprises a conduction module. After all the battery clusters complete voltage balancing, the energy storage device is connected to the conduction module and is conducted to the outside through the conduction module.

5. The energy storage device charging control system according to claim 4, characterized in that: The battery control system also includes a conversion module, which is connected to the conduction module and is used to convert the direct current provided by the energy storage device into alternating current to supply the outside world or to convert the alternating current provided by the outside world into direct current to supply the energy storage device.

6. The energy storage device charging control system according to claim 5, characterized in that: The conduction module includes a relay, and the conversion module includes a bidirectional inverter; or, The conduction module includes a main positive relay and a main negative relay, the conversion module includes a bidirectional inverter, the main positive relay is arranged on a main positive bus and the main negative relay is arranged on a main negative bus, the main positive bus and the main negative bus connect the bidirectional inverter and the energy storage device.

7. The energy storage device charging control system according to claim 3, characterized in that: The preset division scheme includes the number of battery clusters in each battery group, and the number of battery clusters in each battery group is set to two; When the total number of battery clusters is an odd number, the last battery cluster is separately divided into a battery group.

8. A charging control circuit for an energy storage device, characterized in that: Applicable to the energy storage device charging control system described in claims 1-7 above.

9. The energy storage device charging control circuit according to claim 8, characterized in that: The energy storage device control circuit also includes a conversion module and a conduction module, the first end of the conversion module is connected to the outside, the second end of the conversion module is connected to the first end of the conduction module, and the first node and the second node are connected to the second end of the conduction module.

10. The energy storage device charging control circuit according to claim 9, characterized in that: The conversion module includes a bidirectional inverter, and the conduction module includes a relay; or, The conversion module includes a bidirectional inverter, and the conduction module includes a main positive relay and a main negative relay. The first side of the bidirectional inverter is conducted to the outside world, the first end of the second side of the bidirectional inverter is connected to the first end of the main positive relay, the second end of the second side of the bidirectional inverter is connected to the first end of the main negative relay, the first node is connected to the second end of the main positive relay, and the second node is connected to the second end of the main negative relay.

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