CN116154888A

CN116154888A - Inter-cluster circulation suppression system and method

Info

Publication number: CN116154888A
Application number: CN202211190998.7A
Authority: CN
Inventors: 郭安; 刘振; 赵文静
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-05-23

Abstract

The system transmits a second control signal to an energy passive consumption circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range through a processing unit; the energy passive consumption circuit is used for carrying out energy consumption on the high-voltage battery clusters in each battery cluster according to the second control signal so as to enable the maximum inter-cluster voltage difference to reach a second preset threshold range; when the maximum inter-cluster voltage difference reaches a second preset threshold range, the processing unit transmits a first control signal to the energy active transfer circuit; the energy active transfer circuit transfers energy to each battery cluster according to the first control signal so that the maximum inter-cluster voltage difference reaches a first preset threshold range; by controlling active flow and passive absorption of energy among clusters, the pressure difference among the battery clusters can reach a reasonable interval rapidly, thereby realizing the inhibition of circulation caused by unbalanced voltage among the clusters, reducing the circulation inhibition time and improving the circulation inhibition efficiency and reliability among the clusters.

Description

Inter-cluster circulation suppression system and method

Technical Field

The application relates to the technical field of energy storage inter-cluster electrical treatment, in particular to an inter-cluster circulation suppression system and method.

Background

With the development of battery technology, batteries are widely used in more and more fields. For example, lithium ion batteries are increasingly used in new energy ships, and the energy supply mode of the new energy ship is that a battery pack adopts a serial and/or parallel mode to form a large-scale energy storage system, however, the energy storage system comprises a large number of battery monomers. Along with long-time running of the ship, the internal resistance, the voltage and the residual capacity of the batteries among clusters are inconsistent, pressure difference exists among the clusters during multi-cluster parallel operation, and great circulation occurs when the pressure difference is relatively large.

At present, in a related-art inter-cluster circulation suppression mode, for example, energy transfer between high voltage and low voltage is realized through a strategy of controlling power on and power off among battery clusters, so that a pressure difference among the battery clusters is kept in a reasonable range, and then power on is performed, but the suppression mode can lead to long energy transfer time among the battery clusters. For another example, a DC-DC module (a DC-DC converter is a device that converts electric energy with one voltage value into electric energy with another voltage value in a direct current circuit) is added to the output end of each battery cluster, and the output voltage of each cluster is kept consistent through the regulation of the voltage by the converter, and then the power-on is performed, but the cost of the suppression mode is high, and the system volume is large; due to the nonlinearity of the operation of the semiconductor device, the system efficiency is reduced under the same load; the common mode interference generated by the plurality of DC-DC modules during working seriously affects the stability of a direct current source and also affects the BMS (Battery Management System ) to a certain extent; when a short circuit fault occurs on the power grid side, the converter end can generate large current to generate large impact on the battery.

In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: in the conventional inter-cluster circulation suppression method, the inter-cluster circulation suppression time is long, the efficiency is low, and the inter-cluster circulation suppression reliability is low.

Disclosure of Invention

In view of the above, it is necessary to provide an inter-cluster circulation suppression system and method capable of reducing the circulation suppression time and improving the inter-cluster circulation suppression efficiency and reliability, in order to solve the problems of long inter-cluster circulation suppression time and low efficiency and low inter-cluster circulation suppression reliability in the conventional inter-cluster circulation suppression system.

In a first aspect, the present application provides an inter-cluster circulation suppression system comprising:

at least 2 battery clusters, each battery cluster is used for supplying power to a load through a direct current busbar;

the energy active transfer circuit comprises at least 2 energy active transfer units, and each energy active transfer unit is in one-to-one matching connection with each battery cluster; the energy active transfer circuit is configured to transfer energy to each battery cluster according to the received first control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range;

the energy passive consumption circuit comprises at least 2 energy passive consumption units, and each energy passive consumption unit is in one-to-one corresponding matching connection with each battery cluster; the energy passive consumption circuit is configured to consume energy of the high-voltage battery clusters in each battery cluster according to the received second control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a second preset threshold range; any threshold value of the second preset threshold value range is larger than any threshold value of the first preset threshold value range; the high-voltage battery clusters are battery clusters with the voltage in each battery cluster being greater than a preset voltage threshold;

The processing unit is configured to transmit a second control signal to the energy passive consumption circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, and transmit a first control signal to the energy active transfer circuit when the maximum inter-cluster voltage difference in each battery cluster reaches the second preset threshold range; any threshold value of the third preset threshold range is larger than any threshold value of the second preset threshold range.

Optionally, the inter-cluster circulation suppression system further comprises a precharge circuit; the pre-charging circuit comprises at least 2 pre-charging units, and each pre-charging unit is in one-to-one corresponding matching connection with each battery cluster; the pre-charging unit is configured to pre-charge the load according to the received third control signal;

the processing unit is further configured to transmit a third control signal to the pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, until the load pre-charging is completed, transmit a second control signal to the energy passive consumption circuit, and transmit the third control signal to the pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster when the maximum inter-cluster voltage difference in each battery cluster reaches the second preset threshold range, until the load pre-charging is completed, and transmit the first control signal to the energy active transfer circuit.

Optionally, the processing unit is further configured to transmit a third control signal to the pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster when the maximum inter-cluster voltage difference in each battery cluster reaches a fourth preset threshold range, until the load pre-charging is completed, and sequentially transmit the third control signal to the pre-charging units corresponding to the remaining battery clusters in each battery cluster; the maximum threshold of the fourth preset threshold range is greater than the maximum threshold of the first preset threshold range.

Optionally, the processing unit includes a processing chip, an MBMU domain management unit, a voltage acquisition unit, and at least 2 SBMU cluster management units; each SBMU cluster management unit is in one-to-one corresponding matching connection with each battery cluster; the voltage acquisition unit is configured to acquire the voltage of each battery cluster;

the MBMU domain management unit is respectively connected with the voltage acquisition unit and each SBMU cluster management unit; the processing chip is respectively connected with the MBMU domain management unit, the voltage acquisition unit, the energy active transfer circuit and the energy passive consumption circuit.

Optionally, the energy active transfer unit includes a first switching tube, a second switching tube, a first capacitor, a first resistor and a first fuse;

the collector of the first switching tube is connected with the positive electrode of the corresponding battery cluster, the emitter of the first switching tube is connected with the collector of the second switching tube, the emitter of the second switching tube is connected with the direct current busbar, and the grid electrode of the first switching tube and the grid electrode of the second switching tube are respectively connected with the processing chip;

The positive pole of first electric capacity is connected the projecting pole of first switch tube, and the first end of first resistance is connected to the negative pole of first electric capacity, and the first end of first fuse is connected to the second end of first resistance, and the negative pole of corresponding battery cluster, load are connected respectively to the second end of first fuse.

Optionally, the energy passive consumption unit includes a third switching tube, a first diode, a second diode, a third diode, a second capacitor, a second resistor, a first inductor and a second fuse;

the anode of the first diode is respectively connected with the emitter of the third switching tube, the anode of the second capacitor and the first end of the inductor, and the cathode of the first diode is respectively connected with the cathode of the corresponding battery cluster, the cathode of the second diode, the first end of the second resistor and the first end of the second fuse; the collector of the third switching tube is respectively connected with the anode of the second diode and the second end of the second resistor, and the grid electrode of the third switching tube is connected with the processing chip; the second end of the second fuse is respectively connected with the cathode of the second capacitor and the cathode of the third diode; the anode of the third diode is respectively connected with the anode of the second capacitor and the first end of the first inductor, and the second end of the first inductor is connected with the corresponding pre-charging unit.

Optionally, the pre-charging unit includes a third resistor, a main relay and a pre-charging relay;

the first end of the third resistor is connected with the first end of the pre-charging relay, the second end of the third resistor is connected with the first end of the main relay, and the second end of the pre-charging relay is connected with the second end of the main relay; the second end of the main relay is respectively connected with the positive electrode of the corresponding battery cluster and the corresponding energy active transfer unit, and the first end of the main relay is connected with the first inductor.

Optionally, the processing unit further comprises an energy allocation unit connected to the MBMU domain management unit.

In a second aspect, the present application provides an inter-cluster circulation suppression method, the inter-cluster circulation suppression method comprising the steps of;

transmitting a second control signal to the energy passive consumption circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range; the second control signal is used for indicating the energy passive consumption circuit to consume energy of the high-voltage battery clusters in the battery clusters so that the maximum inter-cluster voltage difference in the battery clusters reaches a second preset threshold range; the high-voltage battery clusters are battery clusters with the voltage in each battery cluster being greater than a preset voltage threshold;

when the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range, a first control signal is transmitted to the energy active transfer circuit; the first control signal is used for indicating the energy active transfer circuit to transfer energy to each battery cluster so that the maximum inter-cluster voltage difference in each battery cluster reaches a first preset threshold range; any threshold value of the third preset threshold value range is larger than any threshold value of the second preset threshold value range; any threshold value of the second preset threshold range is larger than any threshold value of the first preset threshold range.

Optionally, when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, the step of transmitting the second control signal to the energy passive consumption circuit includes:

when the voltage difference between the maximum clusters in each battery cluster reaches a third preset threshold range, transmitting a third control signal to a pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster until the load pre-charging is completed, and transmitting a second control signal to an energy passive consumption circuit; the third control signal is used for indicating the pre-charging unit to pre-charge the load.

Optionally, when the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range, the step of transmitting the first control signal to the energy active transfer circuit includes:

when the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range, transmitting a third control signal to a pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster until the load pre-charging is completed, and transmitting a first control signal to an energy active transfer circuit; the third control signal is used for indicating the pre-charging unit to pre-charge the load.

Optionally, the inter-cluster circulation suppression method further includes the steps of:

and when the voltage difference between the maximum clusters in each battery cluster reaches a fourth preset threshold range, transmitting a third control signal to the pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster, and sequentially transmitting the third control signal to the pre-charging units corresponding to the rest battery clusters in each battery cluster after the load pre-charging is completed.

One of the above technical solutions has the following advantages and beneficial effects:

in the inter-cluster circulation suppression system, each battery cluster is used for supplying power to a load through a direct current busbar; the processing unit transmits a second control signal to the energy passive consumption circuit when the voltage difference between the maximum clusters in the battery clusters reaches a third preset threshold range; the energy passive consumption circuit is used for carrying out energy consumption on the high-voltage battery clusters in each battery cluster according to the received second control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a second preset threshold range; the processing unit transmits a first control signal to the energy active transfer circuit when the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range; the energy active transfer circuit transfers energy to each battery cluster according to the received first control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range; by controlling the active flow and passive absorption of energy among the clusters, the pressure difference among the battery clusters can reach a reasonable interval rapidly, the circulation caused by unbalanced voltage among the battery clusters is restrained, the cost is reduced, the service life of the battery is prolonged, and the circulation restraining time is shortened. According to the method, the processing unit is used for controlling the energy active transfer circuit and the energy passive consumption circuit to realize balance of inter-cluster voltage, and when the maximum inter-cluster voltage difference in each battery cluster falls into a second preset threshold range, an inter-cluster energy active transfer mode is adopted, so that energy loss is avoided, and the energy utilization rate is improved; when the maximum inter-cluster voltage difference in each battery cluster falls into a third preset threshold range, a passive energy consumption mode is adopted, so that the battery charging times are reduced, the battery life is prolonged, the energy transfer time is shortened, and the inter-cluster circulation suppression efficiency and reliability are improved.

Drawings

Fig. 1 is a schematic diagram of a first structure of an inter-cluster circulation suppression system in an embodiment of the present application.

Fig. 2 is a second schematic structural diagram of an inter-cluster circulation suppression system in an embodiment of the present application.

Fig. 3 is a schematic diagram of a third structure of the inter-cluster circulation suppression system in the embodiment of the present application.

Fig. 4 is a schematic structural diagram of an active energy transfer unit according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of an energy passive consumption unit in an embodiment of the present application.

Fig. 6 is a fourth schematic structural diagram of an inter-cluster circulation suppression system in an embodiment of the present application.

Fig. 7 is a schematic flow chart of an inter-cluster circulation suppression method in an embodiment of the present application.

Reference numerals:

a battery cluster 100; an energy active transfer circuit 200; an energy active transfer unit 210; the energy passive consumer circuit 300; an energy passive consumption unit 310; a processing unit 400; a processing chip 410; an SBMU cluster management unit 420; an MBMU domain management unit 430; a voltage acquisition unit 440; an energy distribution unit 450; a direct current busbar 500; a priming unit 610; a main relay S1; a precharge relay S2; a first switching tube G1; a second switching tube G2; a third switching tube G3; a first capacitor C1; a second capacitor C2; a first resistor R1; a second resistor R2; a third resistor R3; a first fuse F1; a second fuse F2; a first diode D1; a second diode D2; a third diode D3; a first inductance L1.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In addition, the term "plurality" shall mean two as well as more than two.

In the conventional inter-cluster circulation suppression mode, for example, energy transfer between clusters is performed by controlling power-on and power-off strategies among the battery clusters to realize energy transfer between high voltage and low voltage, so that the pressure difference among the battery clusters is kept in a reasonable range, and then power-on is performed, but the suppression mode can lead to long energy transfer time among the battery clusters. For another example, a DC-DC module (a DC-DC converter refers to a device that converts electric energy with one voltage value into electric energy with another voltage value in a direct current circuit) is added at the output end of each battery cluster, so that the output voltage of each cluster is kept consistent through the regulation of the converter, and then the power-on is performed, but the cost of the suppression mode is high, and the system volume is large; due to the nonlinearity of the operation of the semiconductor device, the system efficiency is reduced under the same load; the stability of a direct current source with serious common mode interference can be generated when a plurality of DC-DC modules work, and the management system of the BMS (Battery Management System ) can be influenced to a certain extent; when a short circuit fault occurs on the power grid side, the converter end can generate large current to generate large impact on the battery system.

The application provides an inter-cluster circulation suppression system and method for ship energy storage. By controlling the active flow and passive absorption of energy between the clusters. The method can realize that the pressure difference between the battery clusters can reach a reasonable interval rapidly, thereby inhibiting the circulation caused by unbalanced voltage between the clusters, reducing the cost, prolonging the service life of the battery, reducing the circulation inhibition time and improving the circulation inhibition efficiency and reliability between the clusters.

In order to solve the problems of long inter-cluster circulation suppression time, low efficiency and low inter-cluster circulation suppression reliability in the conventional inter-cluster circulation suppression method. In one embodiment, as shown in fig. 1, an inter-cluster loop current suppression system is provided, applicable to a ship, the inter-cluster loop current suppression system comprising at least 2 clusters of battery clusters 100, an energy active transfer circuit 200, an energy passive consumption circuit 300, and a processing unit 400.

Each battery cluster 100 is used for supplying power to a load through the direct current busbar 500; the energy active transfer circuit 200 includes at least 2 energy active transfer units 210, and each energy active transfer unit 210 is in one-to-one matching connection with each battery cluster 100; the energy active transfer circuit 200 is configured to perform energy transfer on each battery cluster 100 according to the received first control signal, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a first preset threshold range; the energy passive consumption circuit 300 comprises at least 2 energy passive consumption units 310, and each energy passive consumption unit 310 is in one-to-one corresponding matching connection with each battery cluster 100; the energy passive consumption circuit 300 is configured to perform energy consumption on the high-voltage battery clusters 100 in each battery cluster 100 according to the received second control signal, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a second preset threshold range; any threshold value of the second preset threshold value range is larger than any threshold value of the first preset threshold value range; the high-voltage battery clusters 100 are battery clusters 100 in which the voltage in each battery cluster 100 is greater than a preset voltage threshold; the processing unit 400 is configured to transmit a second control signal to the energy passive consumption circuit 300 when the maximum inter-cluster voltage difference in each battery cluster 100 reaches a third preset threshold range, and transmit a first control signal to the energy active transfer circuit 200 when the maximum inter-cluster voltage difference in each battery cluster 100 reaches the second preset threshold range; any threshold value of the third preset threshold range is larger than any threshold value of the second preset threshold range.

The battery cluster 100 may include a plurality of battery cells, and the battery cluster 100 refers to a battery assembly that is formed by connecting the battery cells in series, parallel or series-parallel connection, and then is connected with an accessory facility to realize independent operation. The load may be, but is not limited to, an inverter, a motor control module, or the like. The dc bus 500 may be used to electrically connect each cluster of cells to a load side such as a daily inverter, a motor control module, and the like.

The energy active transfer circuit 200 may include a number of energy active transfer units 210. Each energy active transfer unit 210 is in one-to-one matching connection with each battery cluster 100, for example, the system includes 5 battery clusters 100, and the number of corresponding energy active transfer units 210 is 5, that is, 5 energy active transfer units 210 are in one-to-one matching connection with 5 battery clusters 100. The energy active transfer circuit 200 is mainly used for transferring the energy of the battery cluster 100 with the high voltage to each battery cluster 100 with the low voltage through the energy active transfer unit 210 when the voltage difference between the battery clusters 100 is in the second preset threshold range, so that the voltages of the battery clusters 100 are quickly consistent. The second preset threshold range may be, for example, 5 v+.v < 10V.

The energy passive consumption circuit 300 may include a number of energy passive consumption units 310. Each energy passive consumption unit 310 is in one-to-one matching connection with each battery cluster 100, for example, the system includes 5 battery clusters 100, and the number of corresponding energy passive consumption units 310 is 5, that is, 5 energy passive consumption units 310 are in one-to-one matching connection with 5 battery clusters 100. The energy passive consumption circuit 300 can be used for absorbing and consuming the energy of the battery cluster 100 with the high battery voltage by the energy passive consumption unit 310 when the voltage difference between the battery clusters 100 is in the third preset threshold range, so that the voltage difference between each battery cluster 100 can reach the second preset threshold range quickly. The third preset threshold range may be 10.ltoreq.V < 20V, for example.

The processing unit 400 may be configured to control the active energy transfer circuit 200 and the passive energy consumption circuit 300, specifically, when the maximum inter-cluster voltage difference in each battery cluster 100 reaches the second preset threshold range, the processing unit 400 transmits a first control signal to the active energy transfer circuit 200, that is, when the inter-cluster voltage difference between the battery clusters 100 is not large, the active energy transfer circuit 200 is controlled to work, and an active energy transfer manner between the battery clusters 100 is adopted to realize the balance of voltages between the battery clusters 100, thereby avoiding energy loss. The energy utilization rate is improved. When the maximum inter-cluster voltage difference in each battery cluster 100 reaches the third preset threshold range, the processing unit 400 transmits a second control signal to the energy passive consumption circuit 300, that is, when the inter-cluster voltage difference between the battery clusters 100 is larger, the energy passive consumption circuit 300 is controlled to work, and the passive energy consumption mode between the battery clusters 100 is adopted, so that the repeated charging times of the battery are reduced, and the service life of the battery is prolonged. Reducing energy transfer time.

The second control signal may be a PWM signal of a corresponding duty cycle, and the first control signal may be a PWM signal of a corresponding duty cycle. The first preset threshold range may be, but is not limited to, 0.ltoreq.V < 1V. The high-voltage battery cluster 100 is a battery cluster 100 in which the voltage in each battery cluster 100 is greater than a preset voltage threshold, for example, the preset voltage threshold may be an average voltage value in each battery cluster 100, and then the high-voltage battery cluster 100 is a battery cluster 100 in which the voltage in each battery cluster 100 is greater than a ticket voltage value.

Each battery cluster 100 is used for supplying power to a load through a direct current busbar 500; the processing unit 400 transmits a second control signal to the energy passive consumption circuit 300 when the maximum inter-cluster voltage difference in each battery cluster 100 reaches a third preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is large; the energy passive consumption circuit 300 consumes energy of the high-voltage battery cluster 100 in each battery cluster 100 according to the received second control signal, and the energy passive consumption unit 310 of the battery cluster 100 with the corresponding high voltage consumes the electric quantity of the battery cluster 100 with the high voltage in the form of heat, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a second preset threshold range, and the energy passive consumption circuit 300 is disconnected; the processing unit 400 transmits a first control signal to the energy active transfer circuit 200 when the maximum inter-cluster voltage difference in each of the battery clusters 100 reaches a second preset threshold range, that is, when the inter-cluster voltage difference is not large; the energy active transfer circuit 200 transfers energy to each battery cluster 100 according to the received first control signal, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a first preset threshold range, the voltage among the battery clusters 100 is balanced, energy loss is avoided, and the energy utilization rate is improved; by controlling the active flow and passive absorption of energy between clusters, the pressure difference between the battery clusters 100 can quickly reach a reasonable interval, thereby realizing the inhibition of the circulation caused by the unbalanced voltage between the battery clusters 100, reducing the cost, prolonging the service life of the battery and reducing the circulation inhibition time.

In the above embodiment, the processing unit 400 controls the energy active transfer circuit 200 and the energy passive consumption circuit 300 to realize the balance of the inter-cluster voltage, and when the maximum inter-cluster voltage difference in each battery cluster 100 falls within the second preset threshold range, the inter-cluster energy active transfer mode is adopted, so as to avoid energy loss and improve the energy utilization rate; when the maximum inter-cluster voltage difference in each battery cluster 100 falls within the third preset threshold range, a passive energy consumption mode is adopted, so that the battery charging times are reduced, the battery life is prolonged, the energy transfer time is shortened, and the inter-cluster circulation suppression efficiency and reliability are improved.

To further reduce the loop current suppression time in the battery system and improve the inter-cluster loop current suppression efficiency and reliability, in one example, as shown in fig. 2, the inter-cluster loop current suppression system further includes a pre-charge circuit; the pre-charging circuit comprises at least 2 pre-charging units 610, and each pre-charging unit 610 is in one-to-one corresponding matching connection with each battery cluster 100; the precharge unit 610 is configured to precharge the load according to the received third control signal.

The processing unit 400 is further configured to transmit a third control signal to the pre-charging unit 610 corresponding to the highest voltage battery cluster 100 among the battery clusters 100 when the maximum inter-cluster voltage difference among the battery clusters 100 reaches a third preset threshold range, to transmit a second control signal to the energy passive consumption circuit 300 until the load pre-charging is completed, and to transmit a third control signal to the pre-charging unit 610 corresponding to the highest voltage battery cluster 100 among the battery clusters 100 until the load pre-charging is completed when the maximum inter-cluster voltage difference among the battery clusters 100 reaches a second preset threshold range.

The pre-charging circuit may include a plurality of pre-charging units 610. Each pre-charging unit 610 is in one-to-one matching connection with each battery cluster 100, for example, the system includes 5 battery clusters 100, and the number of corresponding pre-charging units 610 is 5, that is, the 5 pre-charging units 610 are in one-to-one matching connection with the 5 battery clusters 100. The pre-charging unit 610 may be used to protect the main relay S1 included in the pre-storing unit. The third control signal may be a level signal.

The processing unit 400 may monitor the working state of the battery system in real time, and after the self-checking of the battery system is completed, may obtain the voltage of each battery cluster 100, compare the highest voltage with the lowest voltage in the voltages of each battery cluster 100, and obtain the maximum inter-cluster voltage difference in each battery cluster 100 according to the result of the processing. When the maximum inter-cluster voltage difference in each battery cluster 100 reaches a third preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is larger, the processing unit 400 transmits a third control signal to the pre-charging unit 610 corresponding to the highest-voltage battery cluster 100 in each battery cluster 100, so that the battery cluster 100 with the highest voltage conducts the pre-charging branch of the pre-charging unit 610, performs pre-charging on the load side connected with the direct current busbar 500, disconnects the pre-charging branch of the pre-charging unit 610 until the load pre-charging is completed, and transmits a second control signal to the energy passive consumption circuit 300; the energy passive consumption circuit 300 consumes energy of the high-voltage battery cluster 100 in each battery cluster 100 according to the received second control signal, and the energy passive consumption unit 310 of the battery cluster 100 corresponding to the high-voltage battery cluster 100 consumes the electric quantity of the battery cluster 100 with high voltage in the form of heat, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a second preset threshold range, and the energy passive consumption circuit 300 is disconnected.

When the maximum inter-cluster voltage difference in each battery cluster 100 reaches the second preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is not large, the processing unit 400 transmits a third control signal to the pre-charging unit 610 corresponding to the highest-voltage battery cluster 100 in each battery cluster 100, so that the battery cluster 100 with the highest voltage conducts the pre-charging branch of the pre-charging unit 610, performs pre-charging on the load side connected with the direct current busbar 500, disconnects the pre-charging branch of the pre-charging unit 610 until the load pre-charging is completed, and transmits the first control signal to the energy active transfer circuit 200; the energy active transfer circuit 200 transfers energy to each battery cluster 100 according to the received first control signal, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a first preset threshold range, the voltage among the battery clusters 100 is balanced, energy loss is avoided, and the energy utilization rate is improved; by controlling the active flow and passive absorption of energy between clusters, the pressure difference between the battery clusters 100 can quickly reach a reasonable interval, thereby realizing the inhibition of the circulation caused by the unbalanced voltage between the battery clusters 100, reducing the cost, prolonging the service life of the battery and reducing the circulation inhibition time.

The processing unit 400 is further configured to transmit a third control signal to the pre-charging unit 610 corresponding to the highest voltage battery cluster 100 in each battery cluster 100 when the maximum inter-cluster voltage difference in each battery cluster 100 reaches the fourth preset threshold range, until the load pre-charging is completed, and sequentially transmit the third control signal to the pre-charging units 610 corresponding to the remaining battery clusters 100 in each battery cluster 100; the maximum threshold of the fourth preset threshold range is greater than the maximum threshold of the first preset threshold range.

Wherein, the fourth preset threshold range can be 0.ltoreq.V < 5V. The processing unit 400 obtains the voltages of the battery clusters 100, compares the highest voltage with the lowest voltage among the voltages of the battery clusters 100, and obtains the maximum inter-cluster voltage difference in the battery clusters 100 according to the processing result. When the maximum inter-cluster voltage difference in each battery cluster 100 reaches the fourth preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is smaller, the processing unit 400 transmits a third control signal to the pre-charging unit 610 corresponding to the highest-voltage battery cluster 100 in each battery cluster 100, so that the highest-voltage battery cluster 100 preferentially closes the pre-charging branch of the pre-charging unit 610, and performs pre-charging on the load side connected with the direct current busbar 500 until the main circuit of the pre-charging unit 610 is closed after the load pre-charging is completed, and then the battery cluster 100 is powered on. Further, a third control signal is sequentially transmitted to the pre-charging units 610 corresponding to the remaining battery clusters 100 in each battery cluster 100, so that the remaining battery clusters 100 are pre-charged in sequence, the main circuit of the corresponding pre-charging unit 610 is closed, the completion of the current-up process of the whole battery system is realized, and then when the voltage difference between the battery clusters 100 is smaller, the pre-charging circuit is directly controlled to operate, and the energy active transfer circuit 200 is not required to be started to transfer energy or the energy passive consumption circuit 300 is not required to consume energy, so that the energy utilization rate is improved, the service life of the battery is prolonged, and the inter-cluster circulation suppression efficiency and reliability are improved.

In one embodiment, as shown in fig. 3, the processing unit 400 includes a processing chip 410, an MBMU (Master Battery Management Unit, main battery management unit) domain management unit, a voltage acquisition unit 440, and at least 2 SBMU (Slave Battery Management Unit, auxiliary battery management unit) cluster management units; each SBMU cluster management unit 420 is in one-to-one matching connection with each battery cluster 100; the voltage acquisition unit 440 is configured to acquire voltages of the respective battery clusters 100. The MBMU domain management unit 430 is respectively connected with the voltage acquisition unit 440 and each SBMU cluster management unit 420; the processing chip 410 is respectively connected with the MBMU domain management unit 430, the voltage acquisition unit 440, the energy active transfer circuit 200 and the energy passive consumption circuit 300. Illustratively, the processing unit 400 further includes an energy distribution unit 450 (i.e., an EMS unit) coupled to the MBMU domain management unit 430.

The processing chip 410 may be, but is not limited to, a single chip microcomputer, a DSP, or an FPGA. The MBMU domain management unit 430 may be configured to receive the monitoring information of the battery cluster 100 monitored by the SBMU cluster management unit 420, and communicate with an EMS (battery management system) unit simultaneously with fault monitoring and function control of the entire battery system. The SBMU cluster management unit 420 may be configured to receive the cell status information collected by the VCMU (Volt Current Management System, voltage and current collection management unit) and the TCMU (Time Management System, time collection management unit), and perform fault monitoring and function control in the battery cluster 100. The voltage acquisition unit 440 (HMU unit) refers to a high voltage acquisition unit that can be used to acquire the bus voltage of each battery cluster 100. The energy distribution unit 450 can be used for managing the energy distribution of each power utilization module of the ship and realizing the protection function of the system.

For example, the MBMU domain management unit 430 starts self-checking after receiving the EMS unit ready signal, and after the MBMU domain management unit 430 finishes self-checking, the voltage acquisition unit 440 (HMU unit) acquires the bus voltage of each battery cluster 100, and uploads the acquired bus voltage of each battery cluster 100 to the MBMU domain management unit 430, and the MBMU domain management unit 430 compares the highest voltage with the lowest voltage in each battery cluster 100. And transmits the obtained maximum inter-cluster voltage difference in each battery cluster 100 to the processing chip 410 according to the result of the processing. When the maximum inter-cluster voltage difference in each battery cluster 100 reaches a third preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is larger, the processing chip 410 transmits a third control signal to the pre-charging unit 610 corresponding to the highest-voltage battery cluster 100 in each battery cluster 100, so that the battery cluster 100 with the highest voltage conducts the pre-charging branch of the pre-charging unit 610, performs pre-charging on the load side connected with the direct current busbar 500, disconnects the pre-charging branch of the pre-charging unit 610 until the load pre-charging is completed, and transmits a second control signal to the energy passive consumption circuit 300; the energy passive consumption circuit 300 consumes energy of the high-voltage battery cluster 100 in each battery cluster 100 according to the received second control signal, and the energy passive consumption unit 310 of the battery cluster 100 corresponding to the high-voltage battery cluster 100 consumes the electric quantity of the battery cluster 100 with high voltage in the form of heat, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a second preset threshold range, and the energy passive consumption circuit 300 is disconnected.

When the maximum inter-cluster voltage difference in each battery cluster 100 reaches the second preset threshold range, that is, when the inter-cluster voltage difference between the battery clusters 100 is not large, the processing chip 410 transmits a third control signal to the pre-charging unit 610 corresponding to the highest-voltage battery cluster 100 in each battery cluster 100, so that the battery cluster 100 with the highest voltage conducts the pre-charging branch of the pre-charging unit 610, performs pre-charging on the load side connected with the direct current busbar 500, disconnects the pre-charging branch of the pre-charging unit 610 until the load pre-charging is completed, and transmits the first control signal to the energy active transfer circuit 200; the energy active transfer circuit 200 transfers energy to each battery cluster 100 according to the received first control signal, so that the maximum inter-cluster voltage difference in each battery cluster 100 reaches a first preset threshold range, the voltage among the battery clusters 100 is balanced, energy loss is avoided, and the energy utilization rate is improved; by controlling the active flow and passive absorption of energy between clusters, the pressure difference between the battery clusters 100 can quickly reach a reasonable interval, thereby realizing the inhibition of the circulation caused by the unbalanced voltage between the battery clusters 100, reducing the cost, prolonging the service life of the battery and reducing the circulation inhibition time.

For another example, the bus voltage of each battery cluster 100 is collected by the voltage collection unit 440 (HMU unit), and the collected bus voltage of each battery cluster 100 is transmitted to the processing chip 410, and the highest voltage and the lowest voltage in each battery cluster 100 are compared by the processing chip 410. And according to the result of the processing, the obtained maximum inter-cluster voltage difference in each battery cluster 100 can further control the energy active transfer unit 210 and/or the energy passive consumption unit 310 according to the magnitude of the maximum inter-cluster voltage difference in each battery cluster 100, thereby avoiding energy loss, improving the energy utilization rate, prolonging the service life of the battery, reducing the energy transfer time, and improving the inter-cluster circulation suppression efficiency and reliability.

In one embodiment, as shown in fig. 6, the precharge unit 610 includes a third resistor R3, a main relay S1, and a precharge relay S2. The first end of the third resistor R3 is connected with the first end of the pre-charging relay S2, the second end of the third resistor R3 is connected with the first end of the main relay S1, and the second end of the pre-charging relay S2 is connected with the second end of the main relay S1; the second end of the main relay S1 is connected to the positive electrode of the corresponding battery cluster 100 and the corresponding energy active transfer unit 210, respectively, and the first end of the main relay S1 is connected to the first inductor L1.

The third resistor R3 is a pre-charge resistor.

As shown in fig. 4, the energy active transfer unit 210 includes a first switching tube G1, a second switching tube G2, a first capacitor C1, a first resistor R1, and a first fuse F1. The collector of the first switch tube G1 is connected with the positive electrode of the corresponding battery cluster 100, the emitter of the first switch tube G1 is connected with the collector of the second switch tube G2, the emitter of the second switch tube G2 is connected with the direct current busbar 500, and the grid of the first switch tube G1 and the grid of the second switch tube G2 are respectively connected with the processing chip 410. The positive pole of first electric capacity C1 is connected first switch tube G1's projecting pole, and first resistance R1's first end is connected to first electric capacity C1's negative pole, and first fuse F1's first end is connected to first resistance R1's second end, and corresponding battery cluster 100's negative pole, load are connected respectively to first fuse F1's second end.

The first switching tube G1 can adopt an IGBT device; the second switching tube G2 can adopt an IGBT device; by adopting IGBT devices as the first switching tube G1 and the second switching tube G2, compared with the traditional scheme, the method for suppressing the inter-cluster circulation by connecting DC-DC modules in series can greatly reduce the cost. The first capacitor C1 is a super capacitor. The first resistor R1 is a current limiting resistor, and the first resistor R1 can be used for avoiding short-circuit and large current generated when the first capacitor C1 is charged, thereby affecting the service life of the battery. The first fuse F1 may be used to provide short-circuit protection for the entire circuit.

Based on that the collector of the first switching tube G1 is connected to the positive electrode of the corresponding battery cluster 100, the emitter of the first switching tube G1 is connected to the collector of the second switching tube G2, the emitter of the second switching tube G2 is connected to the dc bus 500, and the gates of the first switching tube G1 and the second switching tube G2 are respectively connected to the processing chip 410. The positive electrode of the first capacitor C1 is connected with the emitter of the first switch tube G1, the negative electrode of the first capacitor C1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the first fuse F1, the second end of the first fuse F1 is respectively connected with the negative electrode and the load of the corresponding battery cluster 100, and then

When the maximum voltage difference between the battery clusters 100 reaches the second preset threshold range (e.g., V is less than or equal to 5V and less than 10V), that is, when the voltage difference between the battery clusters 100 is not large, the processing chip 410 transmits a third control signal to the pre-charging unit 610 corresponding to the battery cluster 100 with the highest voltage among the battery clusters 100, so that the battery cluster 100 with the highest voltage closes the pre-charging relay S2 of the pre-charging unit 610, performs pre-charging on the load side (e.g., equivalent capacitance in the figure) connected with the dc bus 500, and opens the pre-charging relay S2 of the pre-charging unit 610 until the load pre-charging is completed, and transmits the first control signal to the active energy transfer circuit 200,

by connecting the energy active transfer units 210 of the loops of the battery clusters 100 in parallel, the on time of the first switch tube G1 is controlled by PWM, the first switch tube G1 is turned on, and the second switch tube G2 is turned off, so that the battery clusters 100 charge the first capacitor C1, when the voltage of the first capacitor C1 of each energy active transfer unit 210 is consistent with that of each battery cluster 100 connected in parallel, the first switch tube G1 is opened, the second switch tube G2 is closed, and the first capacitor C1 of the energy active transfer unit 210 of each battery cluster 100 is connected in parallel, so that the first capacitor C1 of each battery cluster 100 transfers energy. When the voltages of the first capacitances C1 of the respective battery clusters 100 are identical, the second switching tube G2 is opened and the first switching tube G1 is closed. Each battery cluster 100 transfers energy with the first capacitor C1 of each battery cluster 100 until the voltage of each battery cluster 100 is identical. The above steps are repeated, and the first switching tube G1 and the second switching tube G2 of the energy transfer unit are turned off when the voltage differences of the respective battery clusters 100 are identical. After the battery clusters 100 are pre-charged, the main relay S1 is closed, so that the whole energy transfer process is completed, and the energy active transfer unit 210 loop is in an open state, so that the voltage among the battery clusters 100 is balanced, the energy loss is avoided, and the energy utilization rate is improved; by controlling the active flow and passive absorption of energy between clusters, the pressure difference between the battery clusters 100 can quickly reach a reasonable interval, thereby realizing the inhibition of the circulation caused by the unbalanced voltage between the battery clusters 100, reducing the cost, prolonging the service life of the battery and reducing the circulation inhibition time.

In one embodiment, as shown in fig. 5, the energy passive consumption unit 310 includes a third switching tube G3, a first diode D1, a second diode D2, a third diode D3, a second capacitor C2, a second resistor R2, a first inductance L1, and a second fuse F2.

The anode of the first diode D1 is respectively connected with the emitter of the third switching tube G3, the anode of the second capacitor C2 and the first end of the inductor, and the cathode of the first diode D1 is respectively connected with the cathode of the corresponding battery cluster 100, the cathode of the second diode D2, the first end of the second resistor R2 and the first end of the second fuse F2; the collector of the third switching tube G3 is respectively connected with the anode of the second diode D2 and the second end of the second resistor R2, and the grid of the third switching tube G3 is connected with the processing chip 410; the second end of the second fuse F2 is respectively connected with the cathode of the second capacitor C2 and the cathode of the third diode D3; the anode of the third diode D3 is connected to the anode of the second capacitor C2 and the first end of the first inductor L1, respectively, and the second end of the first inductor L1 is connected to the corresponding pre-charging unit 610.

The third switching tube G3 may adopt an IGBT device, and by adopting the IGBT device as the first switching tube G1 and the second switching tube G2, compared with the conventional scheme, the method of suppressing the inter-cluster circulation by connecting DC-DC modules in series, can greatly reduce the cost. The first diode D1, the second diode D2 and the third diode D3 are freewheeling diodes, and the third diode D3 can be used to reduce the surge voltage generated when the third switch tube G3 is turned off. The second capacitor C2 is a filter capacitor; the second resistor R2 is a dissipation resistor. The second fuse F2 may be used to provide short-circuit protection for the entire circuit. The LC filter circuit formed by the first inductor L1 and the second capacitor C2 can be used for preventing harmonic interference caused by the ground capacitor generated by overlong laying of the circuit, and meanwhile, the first inductor L1 has a protective effect on components when current is suddenly changed.

Based on that the anode of the first diode D1 is respectively connected with the emitter of the third switch tube G3, the anode of the second capacitor C2 and the first end of the inductor, the cathode of the first diode D1 is respectively connected with the cathode of the corresponding battery cluster 100, the cathode of the second diode D2, the first end of the second resistor R2 and the first end of the second fuse F2; the collector of the third switching tube G3 is respectively connected with the anode of the second diode D2 and the second end of the second resistor R2, and the grid of the third switching tube G3 is connected with the processing chip 410; the second end of the second fuse F2 is respectively connected with the cathode of the second capacitor C2 and the cathode of the third diode D3; the anode of the third diode D3 is respectively connected to the anode of the second capacitor C2 and the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the corresponding pre-charging unit 610, so that when the maximum inter-cluster voltage difference in each battery cluster 100 reaches a third preset threshold range (for example, 20V is less than or equal to V), that is, when the inter-cluster voltage difference between the battery clusters 100 is larger, a third control signal is transmitted to the pre-charging unit 610 corresponding to the highest voltage battery cluster 100 in each battery cluster 100, so that the battery cluster 100 with the highest voltage closes the pre-charging relay S2 of the pre-charging unit 610, pre-charging is performed on the load side (for example, the equivalent capacitor in the figure) connected with the direct current busbar 500, and after the load pre-charging is completed, the pre-charging relay S2 of the pre-charging unit 610 is disconnected, and the second control signal is transmitted to the energy passive consumption circuit 300; the energy passive consumption unit 310 connected in series in the loop of each battery cluster 100 controls the on time of the third switching tube G3 by adopting PWM, and the third switching tube G3 is turned on, so that each battery cluster 100 with high voltage consumes the electric quantity of the battery cluster 100 with high voltage in the form of heat through the second resistor R2. At this time, the loop of the energy active transfer unit 210 is in an off state, when the voltage difference between the battery clusters 100 falls within a second preset threshold range (V is less than or equal to 5V and less than 10V), the loop of the energy passive consumption unit 310 is turned off, the energy active transfer circuit 200 is controlled to enter a working state, and when the voltage differences of the battery clusters 100 are consistent, the first switching tube G1 and the second switching tube G2 of the energy active transfer unit 210 are turned off. Each battery cluster 100 is pre-charged, and after the pre-charging is completed, the main relay S1 is closed, thereby completing the entire current-up process. The active energy transfer unit 210 loop is now in an off state. By controlling the turn-on sequence of the first switching tube G1 and the second switching tube G2 of the energy active transfer unit 210 and the third switching tube G3 of the energy passive consumption unit 310, the voltage between the battery clusters 100 is balanced, the energy loss is avoided, and the energy utilization rate is improved; by controlling active flow and passive absorption of energy among clusters, the pressure difference among the battery clusters 100 can reach a reasonable interval rapidly, and the circulation generated by unbalanced voltage among the battery clusters 100 is restrained, meanwhile, the cost is reduced, the service life of the battery is prolonged, the circulation restraining time is shortened, and therefore the circulation restraining efficiency and reliability among clusters are improved.

In one embodiment, as shown in fig. 7, there is provided an inter-cluster circulation suppression method applicable to a battery system powered by energy stored in a ship, the inter-cluster circulation suppression method including the steps of;

step S710, when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, transmitting a second control signal to the energy passive consumption circuit; the second control signal is used for indicating the energy passive consumption circuit to consume energy of the high-voltage battery clusters in the battery clusters so that the maximum inter-cluster voltage difference in the battery clusters reaches a second preset threshold range; the high-voltage battery clusters are battery clusters with the voltage in each battery cluster being greater than a preset voltage threshold.

Step S720, when the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range, a first control signal is transmitted to the energy active transfer circuit; the first control signal is used for indicating the energy active transfer circuit to transfer energy to each battery cluster so that the maximum inter-cluster voltage difference in each battery cluster reaches a first preset threshold range; any threshold value of the third preset threshold value range is larger than any threshold value of the second preset threshold value range; any threshold value of the second preset threshold range is larger than any threshold value of the first preset threshold range.

For the specific content of the inter-cluster loop suppression method, reference may be made to the content of the inter-cluster loop suppression system, which is not described herein.

Specifically, when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, namely when the inter-cluster voltage difference is larger, the processing unit transmits a second control signal to the energy passive consumption circuit; the energy passive consumption circuit consumes energy of the high-voltage battery clusters in each battery cluster according to the received second control signal, and the energy passive consumption unit of the battery cluster with high corresponding voltage consumes the electric quantity of the battery cluster with high voltage in a heat form so that the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range, and then the energy passive consumption circuit is disconnected; the processing unit transmits a first control signal to the energy active transfer circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range, namely when the inter-cluster voltage difference is not large; the energy active transfer circuit transfers energy to each battery cluster according to the received first control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range, realize the balance of the inter-cluster voltage, avoid energy loss and improve the energy utilization rate; by controlling the active flow and passive absorption of energy among the clusters, the pressure difference among the battery clusters can reach a reasonable interval rapidly, the circulation caused by unbalanced voltage among the battery clusters is restrained, the cost is reduced, the service life of the battery is prolonged, and the circulation restraining time is shortened.

In the above embodiment, the processing unit controls the energy active transfer circuit and the energy passive consumption circuit to realize the balance of the inter-cluster voltage, and when the maximum inter-cluster voltage difference in each battery cluster falls into the second preset threshold range, the inter-cluster energy active transfer mode is adopted, so that the energy loss is avoided, and the energy utilization rate is improved; when the maximum inter-cluster voltage difference in each battery cluster falls into a third preset threshold range, a passive energy consumption mode is adopted, so that the battery charging times are reduced, the battery life is prolonged, the energy transfer time is shortened, and the inter-cluster circulation suppression efficiency and reliability are improved.

In one example, in step S710, when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range, the step of transmitting the second control signal to the energy passive consumption circuit includes:

The processing unit can monitor the working state of the battery system in real time, can acquire the voltage of each battery cluster after the self-checking of the battery system is finished, compares the highest voltage with the lowest voltage in the voltages of each battery cluster, and obtains the maximum inter-cluster voltage difference in each battery cluster according to the processing result. When the voltage difference between the maximum clusters in each battery cluster reaches a third preset threshold range, namely when the voltage difference between the battery clusters is larger, the processing unit transmits a third control signal to the pre-charging unit corresponding to the highest-voltage battery cluster in each battery cluster, so that the battery cluster with the highest voltage is conducted with the pre-charging branch of the pre-charging unit, the load side connected with the direct current busbar is pre-charged, the pre-charging branch of the pre-charging unit is disconnected until the load pre-charging is completed, and the second control signal is transmitted to the energy passive consumption circuit; and the energy passive consumption circuit consumes energy of the high-voltage battery clusters in each battery cluster according to the received second control signal, and the energy passive consumption unit of the battery cluster with high corresponding voltage consumes the electric quantity of the battery cluster with high voltage in a heat form so that the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range, and then the energy passive consumption circuit is disconnected.

In one example, in step S720, when the maximum inter-cluster voltage difference in each battery cluster reaches the second preset threshold range, the step of transmitting the first control signal to the energy active transfer circuit includes:

When the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range, namely when the voltage difference between the battery clusters is not large, the processing unit transmits a third control signal to the pre-charging unit corresponding to the highest-voltage battery cluster in each battery cluster, so that the battery cluster with the highest voltage is conducted with a pre-charging branch of the pre-charging unit, the load side connected with the direct current busbar is pre-charged, the pre-charging branch of the pre-charging unit is disconnected until the load pre-charging is completed, and the first control signal is transmitted to the energy active transfer circuit; the energy active transfer circuit transfers energy to each battery cluster according to the received first control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range, realize the balance of the inter-cluster voltage, avoid energy loss and improve the energy utilization rate; by controlling the active flow and passive absorption of energy among the clusters, the pressure difference among the battery clusters can reach a reasonable interval rapidly, the circulation caused by unbalanced voltage among the battery clusters is restrained, the cost is reduced, the service life of the battery is prolonged, and the circulation restraining time is shortened.

In one example, the inter-cluster circulation suppression method further comprises the steps of:

The processing unit obtains the voltage of each battery cluster, compares the highest voltage with the lowest voltage in the voltages of each battery cluster, and obtains the maximum inter-cluster voltage difference in each battery cluster according to the processing result. When the voltage difference between the maximum clusters in each battery cluster reaches a fourth preset threshold range, namely when the voltage difference between the battery clusters is smaller, the processing unit transmits a third control signal to the pre-charging unit corresponding to the highest-voltage battery cluster in each battery cluster, so that the highest-voltage battery cluster preferentially closes a pre-charging branch of the pre-charging unit, the pre-charging of the load side connected with the direct current busbar is realized, the main circuit of the pre-charging unit is closed until the load pre-charging is completed, and then the battery cluster is electrified. Further, a third control signal is sequentially transmitted to the pre-charging units corresponding to the remaining battery clusters in each battery cluster, so that the remaining battery clusters are pre-charged in sequence, a main circuit of the corresponding pre-charging unit is closed, the completion of the current-up process of the whole battery system is realized, and then when the pressure difference between the battery clusters is smaller, the work of the pre-charging circuit is directly controlled, the energy transfer of an energy active transfer circuit or the energy consumption of an energy passive consumption circuit is not required to be started, and then the energy utilization rate, the service life of the battery and the inter-cluster circulation suppression efficiency and reliability are improved.

Those skilled in the art will appreciate that implementing all or part of the above-described embodiments of the method may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. An inter-cluster circulation suppression system, comprising:

at least 2 battery clusters, wherein each battery cluster is used for supplying power to a load through a direct current busbar;

the energy active transfer circuit comprises at least 2 energy active transfer units, and each energy active transfer unit is in one-to-one corresponding matching connection with each battery cluster; the energy active transfer circuit is configured to transfer energy to each battery cluster according to the received first control signal so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range;

The energy passive consumption circuit comprises at least 2 energy passive consumption units, and each energy passive consumption unit is in one-to-one corresponding matching connection with each battery cluster; the energy passive consumption circuit is configured to consume energy of the high-voltage battery clusters in the battery clusters according to the received second control signal so as to enable the maximum inter-cluster voltage difference in the battery clusters to reach a second preset threshold range; any threshold value of the second preset threshold value range is larger than any threshold value of the first preset threshold value range; the high-voltage battery clusters are battery clusters, and the voltage in each battery cluster is larger than a preset voltage threshold value;

a processing unit configured to transmit the second control signal to the energy passive consuming circuit when a maximum inter-cluster voltage difference in each of the battery clusters reaches a third preset threshold range, and transmit the first control signal to the energy active transferring circuit when the maximum inter-cluster voltage difference in each of the battery clusters reaches a second preset threshold range; any threshold value of the third preset threshold value range is larger than any threshold value of the second preset threshold value range.

2. An inter-cluster circulation suppression system according to claim 1, further comprising a pre-charge circuit; the pre-charging circuit comprises at least 2 pre-charging units, and each pre-charging unit is in one-to-one corresponding matching connection with each battery cluster; the pre-charging unit is configured to pre-charge the load according to the received third control signal;

the processing unit is further configured to transmit the third control signal to a pre-charging unit corresponding to a highest voltage battery cluster in each of the battery clusters when a maximum inter-cluster voltage difference in each of the battery clusters reaches a third preset threshold range, to transmit the second control signal to the energy passive consumption circuit until the load pre-charging is completed, and to transmit the third control signal to a pre-charging unit corresponding to a highest voltage battery cluster in each of the battery clusters when the maximum inter-cluster voltage difference in each of the battery clusters reaches a second preset threshold range, to transmit the first control signal to the energy active transfer circuit until the load pre-charging is completed.

3. The inter-cluster circulation suppression system according to claim 2, wherein the processing unit is further configured to transmit the third control signal to the pre-charging unit corresponding to the highest voltage cluster in each of the battery clusters when the maximum inter-cluster voltage difference in each of the battery clusters reaches a fourth preset threshold range, until the load pre-charging is completed, and sequentially transmit the third control signal to the pre-charging units corresponding to the remaining battery clusters in each of the battery clusters; the maximum threshold value of the fourth preset threshold value range is larger than the maximum threshold value of the first preset threshold value range.

4. An inter-cluster circulation suppression system according to any one of claims 1 to 3, characterized in that the processing unit comprises a processing chip, an MBMU domain management unit, a voltage acquisition unit and at least 2 SBMU cluster management units; each SBMU cluster management unit is in one-to-one corresponding matching connection with each battery cluster; the voltage acquisition unit is configured to acquire the voltage of each battery cluster;

5. The inter-cluster circulation suppression system of claim 4, wherein the energy active transfer unit comprises a first switching tube, a second switching tube, a first capacitor, a first resistor, and a first fuse;

the collector of the first switching tube is connected with the positive electrode of the corresponding battery cluster, the emitter of the first switching tube is connected with the collector of the second switching tube, the emitter of the second switching tube is connected with the direct current busbar, and the grid electrodes of the first switching tube and the second switching tube are respectively connected with the processing chip;

The positive electrode of the first capacitor is connected with the emitter of the first switch tube, the negative electrode of the first capacitor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the first fuse, and the second end of the first fuse is respectively connected with the negative electrode of the corresponding battery cluster and the load.

6. The inter-cluster circulation suppression system of claim 4, wherein the energy-passive-consumer unit includes a third switching tube, a first diode, a second diode, a third diode, a second capacitor, a second resistor, a first inductance, and a second fuse;

the anode of the first diode is respectively connected with the emitter of the third switching tube, the anode of the second capacitor and the first end of the inductor, and the cathode of the first diode is respectively connected with the cathode of the corresponding battery cluster, the cathode of the second diode, the first end of the second resistor and the first end of the second fuse; the collector electrode of the third switching tube is respectively connected with the anode of the second diode and the second end of the second resistor, and the grid electrode of the third switching tube is connected with the processing chip; the second end of the second fuse is respectively connected with the cathode of the second capacitor and the cathode of the third diode; the anode of the third diode is respectively connected with the anode of the second capacitor and the first end of the first inductor, and the second end of the first inductor is connected with the corresponding pre-charging unit.

7. An inter-cluster circulation suppression system according to claim 6, characterized in that the pre-charge unit comprises a third resistor, a main relay and a pre-charge relay;

8. An inter-cluster ring current suppression system according to claim 4, wherein the processing unit further comprises an energy allocation unit connected to the MBMU domain management unit.

9. An inter-cluster circulation suppression method, characterized by comprising the following steps:

transmitting a second control signal to the energy passive consumption circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range; the second control signal is used for indicating the energy passive consumption circuit to consume energy of the high-voltage battery clusters in the battery clusters so as to enable the maximum inter-cluster voltage difference in the battery clusters to reach a second preset threshold range; the high-voltage battery clusters are battery clusters, and the voltage in each battery cluster is larger than a preset voltage threshold value;

When the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range, transmitting a first control signal to an energy active transfer circuit; the first control signal is used for indicating the energy active transfer circuit to transfer energy to each battery cluster so as to enable the maximum inter-cluster voltage difference in each battery cluster to reach a first preset threshold range; any threshold value of the third preset threshold value range is larger than any threshold value of the second preset threshold value range; any threshold value of the second preset threshold value range is larger than any threshold value of the first preset threshold value range.

10. The inter-cluster circulation suppression method according to claim 9, further comprising the step of:

when the voltage difference between the maximum clusters in each battery cluster reaches a fourth preset threshold range, transmitting a third control signal to a pre-charging unit corresponding to the highest-voltage battery cluster in each battery cluster, and sequentially transmitting the third control signal to the pre-charging units corresponding to the rest battery clusters in each battery cluster until the load pre-charging is completed;

and/or the number of the groups of groups,

the step of transmitting the second control signal to the energy passive consumption circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a third preset threshold range comprises the following steps:

When the voltage difference between the maximum clusters in each battery cluster reaches a third preset threshold range, transmitting a third control signal to a pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster until the load is pre-charged, and transmitting the second control signal to the energy passive consumption circuit; the third control signal is used for indicating the pre-charging unit to pre-charge the load;

the step of transmitting the first control signal to the energy active transfer circuit when the maximum inter-cluster voltage difference in each battery cluster reaches a second preset threshold range comprises the following steps:

when the voltage difference between the maximum clusters in each battery cluster reaches a second preset threshold range, transmitting the third control signal to a pre-charging unit corresponding to the highest voltage battery cluster in each battery cluster until the load pre-charging is completed, and transmitting the first control signal to the energy active transfer circuit; the third control signal is used for indicating the pre-charging unit to pre-charge the load.