Battery cluster circulating current suppression and energy recovery system and energy storage prefabricated cabin

Abstract

The utility model discloses a battery cluster ring current suppression and energy recovery system and energy storage prefabricated cabin, including voltage acquisition module, with voltage acquisition module links to each other, charge and discharge module, pre -filling module and suppression recovery module, voltage acquisition module is used for with battery cluster links, gathers battery cluster voltage, charge and discharge module is used for installing between battery cluster and positive and negative busbar, pre -filling module still with the positive loop of charge and discharge module is parallelly connected, suppression recovery module still with charge and discharge module is parallelly connected, when voltage acquisition module gathered battery cluster voltage is greater than or equal to set threshold value, pre -filling module will battery cluster's direct current send into suppression recovery module, and charge and discharge module is in the disconnected state, when voltage acquisition module gathered battery cluster voltage is less than set threshold value, charge and discharge module will battery cluster's direct current send into positive and negative busbar, and pre -filling module and suppression recovery module are in the disconnected state, the utility model discloses through the recovery, shift the electric quantity of battery cluster of having excessive voltage, and the ring current among battery cluster is suppressed.

Description

Technical Field

[0001] This utility model belongs to the field of new energy battery technology, specifically relating to a battery cluster circulation suppression and energy recovery system and an energy storage prefabricated cabin. Background Technology

[0002] Prefabricated containerized energy storage offers flexible energy storage solutions and rapid deployment capabilities. It can effectively balance grid load, provide backup power, and support the integration of renewable energy, thereby promoting sustainable development. However, during long-term use, inconsistencies in battery cells may lead to imbalances in battery clusters, resulting in circulating currents.

[0003] If the prefabricated energy storage module fails to effectively suppress circulating currents, problems such as localized overheating of battery cells and reduced system efficiency may occur in the short term. Localized overheating may lead to a decline in battery electrochemical performance, thereby affecting the battery's discharge capacity and consistency. In addition, abnormal temperature rises and pressure differences may cause the prefabricated energy storage module to frequently trigger protection mechanisms, affecting the stability of the energy storage system and increasing operation and maintenance costs. Continuous circulating currents will exacerbate voltage imbalances in the battery clusters, leading to a shortened battery cycle life and potentially even causing safety hazards such as thermal runaway. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes a battery cluster circulating current suppression and energy recovery system and an energy storage prefabricated compartment. By recovering and transferring the charge of battery clusters with excessive voltage, the circulating current between battery clusters can be effectively suppressed, thereby extending the battery's service life.

[0005] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0006] In a first aspect, this utility model provides a battery cluster circulating current suppression and energy recovery system, including: a voltage acquisition module, and a charging and discharging module, a pre-charging module and a suppression and recovery module connected to the voltage acquisition module;

[0007] The voltage acquisition module is used to connect to the battery cluster and acquire the battery cluster voltage;

[0008] The charging and discharging module is used to be installed between the battery cluster and the positive and negative busbars;

[0009] The pre-charge module is also connected in parallel with the positive circuit of the charge / discharge module;

[0010] The suppression and recovery module is also connected in parallel with the charging and discharging module;

[0011] When the voltage of the battery cluster acquired by the voltage acquisition module is greater than or equal to a set threshold, the precharge module sends the DC current of the battery cluster to the suppression and recovery module, and the charge and discharge module is in the disconnected state.

[0012] When the voltage of the battery cluster acquired by the voltage acquisition module is less than the set threshold, the charging and discharging module sends the DC power of the battery cluster into the positive and negative busbars, and the pre-charge module and the suppression recovery module are in the disconnected state.

[0013] In the above scheme, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the pre-charge module sends the DC current of the battery cluster to the suppression and recovery module, and the charge / discharge module is in a disconnected state, which can effectively suppress the circulating current between battery clusters. When the battery cluster voltage acquired by the voltage acquisition module is less than the set threshold, the charge / discharge module sends the DC current of the battery cluster to the positive and negative busbars, and the pre-charge module and the suppression and recovery module are in a disconnected state to achieve normal charging and discharging.

[0014] In conjunction with the first aspect, optionally, the charging and discharging module includes: a circuit breaker, a first fuse, a second fuse, a main positive relay, and a main negative relay;

[0015] The circuit breaker, the main positive relay, and the first fuse are connected in series to form a positive circuit.

[0016] The circuit breaker, the main negative relay, and the second fuse are connected in series to form a negative circuit.

[0017] The circuit breaker is also used to connect to the positive and negative busbars.

[0018] The above scheme provides a specific circuit structure for the charging and discharging module. This scheme utilizes a circuit breaker to control the switching state of the charging and discharging module; it uses a first fuse and a second fuse to automatically disconnect the circuit in the event of overload or short circuit faults, protecting the electrical equipment and lines in the circuit from damage by overload and short circuit currents. A main positive relay and a main negative relay are used to determine the switching state of the charging and discharging module and the pre-charge module.

[0019] In conjunction with the first aspect, optionally, the precharge module includes a precharge resistor and a precharge relay connected in series;

[0020] The end of the pre-charge resistor away from the pre-charge relay is connected to the line between the first fuse and the main positive relay.

[0021] The end of the precharge relay furthest from the precharge resistor is connected to the connection between the circuit breaker and the main positive relay.

[0022] The above solution provides a specific implementation structure for the precharge module. In this solution, a precharge relay is used to control the switching state of the precharge module; and a precharge resistor is used to limit the charging current when the circuit starts up, thereby protecting the components in the circuit.

[0023] In conjunction with the first aspect, optionally, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the circuit breaker and the main positive relay are in the open state; the precharge relay and the main negative relay are in the closed state.

[0024] The above scheme provides the specific coordination relationship between the components in the charging module and the pre-charging module when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, which facilitates the implementation of the scheme.

[0025] In conjunction with the first aspect, optionally, when the battery cluster voltage acquired by the voltage acquisition module is less than a set threshold, the circuit breaker, the main negative relay, and the main positive relay are in a closed state; the precharge relay is in an open state.

[0026] The above scheme provides the specific coordination relationship between the components in the charging module and the pre-charging module when the battery cluster voltage collected by the voltage acquisition module is less than a set threshold, which facilitates the implementation of the scheme.

[0027] In conjunction with the first aspect, optionally, the suppression and recovery module includes: a third fuse, a fourth fuse, a DC / AC converter, a third relay, a fourth relay, and a fifth relay;

[0028] One end of the third fuse is connected to the connection between the circuit breaker and the main positive relay, and the other end is connected to the DC / AC converter.

[0029] One end of the fourth fuse is connected to the connection between the circuit breaker and the main negative relay, and the other end is connected to the DC / AC converter.

[0030] One end of the third, fourth, and fifth relays is connected to the DC / AC converter, and the other end is used to connect to the power supply equipment.

[0031] The above scheme provides a specific implementation structure for the suppression and recovery module, which uses a third, fourth, and fifth relay to control the switching state of the suppression and recovery module; uses a third and fourth fuse to automatically disconnect the circuit when an overload or short circuit occurs, so as to protect the electrical equipment and lines in the circuit from damage by overload current and short circuit current; and uses a DC / AC converter to convert the received DC to AC, so as to recover and transfer the power of the battery clusters with excessive voltage.

[0032] In conjunction with the first aspect, the suppression recovery module may optionally further include a filter; the filter is disposed between the DC / AC converter and the third and fourth fuses.

[0033] In the above scheme, filters are used to filter and suppress noise, retaining only the useful signal.

[0034] In conjunction with the first aspect, the suppression and recovery module may optionally further include: a fifth fuse, a sixth fuse, and a seventh fuse;

[0035] The fifth, sixth, and seventh fuses are connected in series with the third, fourth, and fifth relays, respectively.

[0036] In the above scheme, the fifth, sixth, and seventh fuses are used to ensure that no damage is caused to the power supply equipment.

[0037] In conjunction with the first aspect, optionally, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the third fuse, the fourth fuse, the DC / AC converter, the third relay, the fourth relay, and the fifth relay are all in working condition, and the DC / AC converter converts DC to AC.

[0038] The above scheme provides the specific coordination relationship of each component in the suppression and recovery module when the battery cluster voltage collected by the voltage acquisition module is less than a set threshold, which facilitates the implementation of the scheme.

[0039] Secondly, this utility model provides an energy storage prefabricated cabin, including a battery cluster circulation suppression and energy recovery system and an auxiliary power supply system as described in the first aspect; the input end of the auxiliary power supply system is connected to the output end of the suppression and recovery module.

[0040] In the above scheme, the circulating current suppression and energy recovery system effectively reduces circulating current by recovering and transferring the charge from battery clusters with excessively high voltage. The system can monitor the status of each battery cluster in real time and execute energy recovery strategies to balance the charge distribution among the clusters. Simultaneously, the recovered energy is used in the auxiliary power supply system of the energy storage prefabricated compartment (which can be stored in the UPS of the auxiliary power supply system), improving overall energy utilization efficiency. This not only extends battery life but also enhances the reliability of the backup power supply, ensuring the continuous operation of the system.

[0041] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0042] This utility model provides a battery cluster circulating current suppression and energy recovery system and an energy storage prefabrication chamber. When the battery cluster voltage collected by the voltage acquisition module is greater than or equal to a set threshold, the pre-charge module sends the DC current of the battery cluster into the suppression and recovery module, and the charging and discharging module is in a disconnected state, which can effectively suppress the circulating current between battery clusters.

[0043] Furthermore, the battery cluster circulating current suppression and energy recovery system and energy storage prefabricated compartment of this invention can, during the process of suppressing the circulating current between battery clusters, transfer the corresponding amount of electricity to the auxiliary power supply system of the energy storage prefabricated compartment through the suppression and recovery module. Simultaneously, the battery cluster circulating current suppression and energy recovery system of this invention can also serve as a self-powered device for the energy storage prefabricated compartment. Attached Figure Description

[0044] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0045] Figure 1 This is a schematic diagram of the electrical structure of a battery cluster circulating current suppression and energy recovery system according to an embodiment of the present invention;

[0046] Figure 2 This is a flowchart illustrating the operation of a battery cluster circulating current suppression and energy recovery system according to an embodiment of the present invention.

[0047] Figure 3 This is a flowchart illustrating the self-powered mode of one embodiment of the present invention.

[0048] Figure 4 This is a schematic diagram of the structure of a battery cluster circulating current suppression and energy recovery system according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of protection of this utility model.

[0050] In the description of this utility model patent, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model patent.

[0051] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] The application principle of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0053] This embodiment provides a battery cluster circulating current suppression and energy recovery system, such as Figure 1 and Figure 4 As shown, it includes: a voltage acquisition module, and a charging / discharging module, a pre-charging module, and a suppression and recovery module connected to the voltage acquisition module;

[0054] The voltage acquisition module is used to connect to the battery cluster and acquire the battery cluster voltage;

[0055] The charging and discharging module is used to be installed between the battery cluster and the positive and negative busbars;

[0056] The pre-charge module is also connected in parallel with the positive circuit of the charge / discharge module;

[0057] The suppression and recovery module is also connected in parallel with the charging and discharging module;

[0058] When the voltage of the battery cluster acquired by the voltage acquisition module is greater than or equal to a set threshold, the precharge module sends the DC current of the battery cluster to the suppression and recovery module, and the charge and discharge module is in the disconnected state.

[0059] When the voltage of the battery cluster acquired by the voltage acquisition module is less than the set threshold, the charging and discharging module sends the DC power of the battery cluster into the positive and negative busbars, and the pre-charge module and the suppression recovery module are in the disconnected state.

[0060] In the above scheme, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the pre-charge module sends the DC current of the battery cluster to the suppression and recovery module, and the charge / discharge module is in a disconnected state, which can effectively suppress the circulating current between battery clusters. When the battery cluster voltage acquired by the voltage acquisition module is less than the set threshold, the charge / discharge module sends the DC current of the battery cluster to the positive and negative busbars, and the pre-charge module and the suppression and recovery module are in a disconnected state to achieve normal charging and discharging.

[0061] In one specific embodiment of this example, the charging and discharging module includes: a circuit breaker QF, a first fuse FU1, a second fuse FU2, a main positive relay KA1, and a main negative relay KA2;

[0062] The circuit breaker QF, the main positive relay KA1, and the first fuse FU1 are connected in series.

[0063] The circuit breaker QF, the main negative relay KA2, and the second fuse FU2 are connected in series.

[0064] The circuit breaker QF is also used to connect to the positive and negative busbars.

[0065] The above scheme provides a specific circuit structure for the charging and discharging module. This scheme utilizes a circuit breaker QF to control the switching state of the charging and discharging module; and utilizes a first fuse FU1 and a second fuse FU2 to automatically disconnect the circuit in the event of overload or short circuit faults, protecting the electrical equipment and lines in the circuit from damage by overload and short circuit currents. A main positive relay KA1 and a main negative relay KA2 are used to determine the switching state of the charging / discharging module and the pre-charge module.

[0066] In one specific embodiment of this example, the precharge module includes a precharge resistor R and a precharge relay KA6 connected in series;

[0067] The end of the pre-charge resistor R that is furthest from the pre-charge relay KA6 is connected to the line between the first fuse FU1 and the main positive relay KA1.

[0068] The end of the precharge relay KA6 furthest from the precharge resistor R is connected to the connection between the circuit breaker QF and the main positive relay KA1.

[0069] The above scheme provides a specific implementation structure for the precharge module. In this scheme, a precharge relay KA6 is used to control the switching state of the precharge module; and a precharge resistor R is used to limit the charging current when the circuit is started, thereby protecting the components in the circuit.

[0070] In one specific embodiment of this example, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the circuit breaker QF and the main positive relay KA1 are in the open state; the precharge relay KA6 and the main negative relay KA2 are in the closed state.

[0071] The above scheme provides the specific coordination relationship between the various components in the charging module and the pre-charging module when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, which facilitates the implementation of the scheme.

[0072] In one specific embodiment of this example, when the battery cluster voltage acquired by the voltage acquisition module is less than a set threshold, the circuit breaker QF, the main negative relay KA2, and the main positive relay KA1 are in a closed state; the precharge relay KA6 is in an open state.

[0073] The above scheme provides the specific coordination relationship between the components in the charging module and the pre-charging module when the battery cluster voltage collected by the voltage acquisition module is less than a set threshold, which facilitates the implementation of the scheme.

[0074] In one specific embodiment of this example, the suppression and recovery module includes: a third fuse FU3, a fourth fuse FU4, a DC / AC converter, a third relay KA3, a fourth relay KA4, and a fifth relay KA5;

[0075] One end of the third fuse FU3 is connected to the connection between the circuit breaker QF and the main positive relay KA1, and the other end is connected to the DC / AC converter;

[0076] One end of the fourth fuse FU4 is connected to the connection between the circuit breaker QF and the main negative relay KA2, and the other end is connected to the DC / AC converter;

[0077] One end of the third relay KA3, the fourth relay KA4, and the fifth relay KA5 is connected to the DC / AC converter, and the other end is used to connect to the power supply equipment.

[0078] The above scheme provides a specific implementation structure for the suppression and recovery module. The third relay KA3, the fourth relay KA4, and the fifth relay KA5 control the switching state of the suppression and recovery module. The third fuse FU3 and the fourth fuse FU4 automatically disconnect the circuit in case of overload or short circuit faults, protecting electrical equipment and lines from damage caused by overload and short circuit currents. A DC / AC converter converts the received DC to AC, enabling the recovery and transfer of charge from battery clusters with excessive voltage.

[0079] In one specific embodiment of this example, the suppression and recycling module further includes a filter; the filter is disposed between the DC / AC converter and the third fuse FU3 and the fourth fuse FU4.

[0080] In the above scheme, filters are used to filter and suppress noise, retaining only the useful signal.

[0081] In one specific embodiment of this example, the suppression and recovery module further includes: a fifth fuse FU5, a sixth fuse FU6, and a seventh fuse FU7;

[0082] The fifth fuse FU5, the sixth fuse FU6, and the seventh fuse FU7 are connected in series with the third relay KA3, the fourth relay KA4, and the fifth relay KA5, respectively.

[0083] In the above scheme, the fifth fuse FU5, the sixth fuse FU6, and the seventh fuse FU7 are used to ensure that no damage is caused to the power supply equipment.

[0084] In one specific embodiment of this example, when the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the third fuse FU3, the fourth fuse FU4, the DC / AC converter, the third relay KA3, the fourth relay KA4, and the fifth relay KA5 are all in working condition, and the DC / AC converter converts DC to AC.

[0085] The above scheme provides the specific coordination relationship of each component in the suppression and recovery module when the battery cluster voltage collected by the voltage acquisition module is less than a set threshold, which facilitates the implementation of the scheme.

[0086] The working principle of the battery cluster circulating current suppression and energy recovery system in this embodiment of the invention will be described in detail below with reference to a specific implementation method.

[0087] like Figure 1 and Figure 4 As shown in the figure, this embodiment provides a battery cluster circulating current suppression and energy recovery system, including a voltage acquisition module, a pre-charge module, a suppression and recovery module, and a charge / discharge module. The battery cluster circulating current suppression and energy recovery system is installed at the connection points between each battery cluster and the positive and negative busbars. The voltage acquisition module can be implemented using a combination of a battery management system (BMS) and a Hall sensor.

[0088] The voltage acquisition module collects the battery cluster voltage and performs relevant judgments, while simultaneously controlling the pre-charge module, circulating current suppression and recovery module, and charge / discharge module. The charge / discharge module controls the connection and disconnection between the battery cluster and the positive and negative busbars. The pre-charge module is connected in parallel to the main positive relay KA1 of the charge / discharge module. At the start of charging / discharging, pre-charging is prioritized (i.e., the pre-charge module is activated first) to prevent large inrush currents from occurring in capacitive or inductive loads on downstream equipment. The suppression and recovery module is connected in parallel to the charge / discharge module and converts the DC power from the battery cluster into AC power via a DC / AC converter, supplying the auxiliary power supply system of the energy storage prefabricated compartment.

[0089] like Figure 2 As shown, during the "circulating current suppression and energy recovery" process, the battery cluster circulating current suppression and energy recovery system performs the following steps:

[0090] The voltage acquisition module connected to each battery cluster acquires the voltage of the corresponding battery cluster (i.e., when the BMS is turned on, it continuously detects the battery cluster voltage).

[0091] Determine if there is an excessively high voltage in the battery clusters, which could lead to a risk of circulating current.

[0092] When it is determined that the battery cluster voltage is too high, and a circulating current risk is considered, the circuit breaker QF in the charging module is disconnected, the pre-charge module corresponding to the high-voltage battery cluster is opened (i.e., the pre-charge relay KA6 is closed), and the total negative relay KA2 in the charging module is closed. The suppression recovery module will start working, and the DC / AC converter will convert the DC power into AC power. The output AC power will then be output to other charging equipment, such as the auxiliary power supply system bus of the energy storage prefabricated cabin.

[0093] Determine whether the battery cluster voltage and the DC side voltage of the DC / AC module (i.e., the voltages on both sides of the charging module) are the same;

[0094] If so, the pre-charge relay KA6 in the pre-charge module will be disconnected, the main positive relay KA1 will be closed simultaneously, and then the circuit breaker QF will be closed to enter the charging and discharging state. That is, as the conversion proceeds, the voltage of the relatively high-voltage battery cluster will continuously decrease. After the voltage acquisition module detects that the inter-cluster voltage difference has reached the allowable difference value, the suppression recovery module will be shut down, and the charging module will be started to begin the normal charging and discharging process.

[0095] If it is determined that there is no battery cluster with high voltage, then the pre-charge module corresponding to all battery clusters is turned on, and the total negative relay KA2 in the charging module is closed.

[0096] Determine whether the battery cluster voltage and the DC side voltage of the DC / AC module (i.e., the voltages on both sides of the charging module) are the same; if so, disconnect the pre-charge relay KA6 in the pre-charge module, simultaneously close the main positive relay KA1, and then close the circuit breaker QF to enter the charging and discharging state.

[0097] During the "self-powered mode" process (if you want to enable the self-powered mode and the energy storage prefabricated module has no external power supply, the energy storage prefabricated module needs to have startup power so that the self-powered function can be activated), such as Figure 3 As shown, the energy storage prefabricated module performs the following steps:

[0098] The energy storage compartment auxiliary system is powered on; the energy storage compartment auxiliary system includes an auxiliary power supply system and other related equipment (such as electrical equipment inside the compartment).

[0099] Energy storage compartment auxiliary system activated;

[0100] The energy storage compartment automatically powers on.

[0101] Continuously monitor whether the energy storage compartment has an external power supply;

[0102] If so, an external power supply will be used to power the energy storage compartment auxiliary system;

[0103] If not, the power consumption requirement of the energy storage compartment auxiliary system is detected, and the main positive relay KA1 and the main negative relay KA2 are closed; the output power of the DC / AC converter is dynamically adjusted according to the battery cluster voltage to convert the battery power into AC power for the auxiliary power supply circuit of the energy storage prefabricated compartment, so that the energy storage prefabricated compartment can still work in the event of a power grid failure.

[0104] In the above scheme, the circulating current suppression and energy recovery system effectively reduces circulating current by recovering and transferring the charge of battery clusters with excessively high voltage. The system can monitor the status of each battery cluster in real time and execute energy recovery strategies to balance the charge distribution within the battery clusters. Simultaneously, the recovered energy is used in the auxiliary power supply system of the energy storage prefabricated module (which can be stored in the UPS of the auxiliary power supply system), improving overall energy utilization efficiency. Example 2

[0105] This embodiment provides an energy storage prefabricated cabin, including the battery cluster circulating current suppression and energy recovery system and the auxiliary power supply system as described in any one of Embodiment 1; the input end of the auxiliary power supply system is connected to the output end of the suppression and recovery module.

[0106] The working principle of the energy storage prefabricated cabin in this embodiment of the invention will be described in detail below with reference to a specific implementation method.

[0107] like Figure 1 and Figure 4 As shown, this embodiment provides an energy storage prefabricated compartment, including a voltage acquisition module, a pre-charge module, a suppression and recovery module, a charge and discharge module, and an energy storage compartment auxiliary system. The battery cluster circulating current suppression and energy recovery system is installed at the connection points of each battery cluster with the positive and negative busbars, respectively. The voltage acquisition module can be implemented using a combination of a battery management system (BMS) and a Hall sensor.

[0108] The voltage acquisition module collects the battery cluster voltage and performs relevant judgments, while simultaneously controlling the pre-charge module, circulating current suppression and recovery module, and charge / discharge module. The charge / discharge module controls the connection and disconnection between the battery cluster and the positive and negative busbars. The pre-charge module is connected in parallel to the main positive relay KA1 of the charge / discharge module. At the start of charging / discharging, pre-charging is prioritized (i.e., the pre-charge module is activated first) to prevent large inrush currents from occurring in capacitive or inductive loads on downstream equipment. The suppression and recovery module is connected in parallel to the charge / discharge module and converts the DC power from the battery cluster into AC power via a DC / AC converter, supplying the auxiliary power supply system of the energy storage prefabricated compartment.

[0109] like Figure 2 As shown, during the "circulating current suppression and energy recovery" process, the battery cluster circulating current suppression and energy recovery system performs the following steps:

[0110] The energy storage compartment auxiliary system is powered on; the energy storage compartment auxiliary system includes an auxiliary power supply system and other related equipment (such as in-cabin electrical equipment).

[0111] Energy storage compartment auxiliary system activated;

[0112] The voltage acquisition module connected to each battery cluster acquires the voltage of the corresponding battery cluster (i.e., the battery cluster BMS is turned on and continuously detects the battery cluster voltage, which is also known as continuous cluster-level voltage detection).

[0113] Determine if there is an excessively high voltage in the battery clusters, which could lead to a risk of circulating current.

[0114] When a high battery cluster voltage is detected, indicating a potential circulating current risk, the circuit breaker QF defaults to the open state. It activates the pre-charge module corresponding to the high-voltage battery cluster (i.e., closes the pre-charge relay KA6, the pre-charge circuit), and closes the main negative relay KA2 in the charging module. The recovery suppression module then begins operation, and the DC / AC converter converts DC power to AC power. This AC power is then output to other charging equipment, such as the auxiliary power supply bus of the energy storage prefabricated module. The circuit breaker checks if the battery cluster voltage is the same as the DC-side voltage of the DC / AC module. If so, it disconnects the pre-charge relay KA6 in the pre-charge module (i.e., the pre-charge circuit closes), and simultaneously closes the main positive relay KA1. The DC / AC module then begins operation, supplying power from the high-voltage battery cluster to the auxiliary power supply circuit; as the battery cluster power decreases, the battery cluster voltage drops.

[0115] If it is determined that there is no high battery cluster voltage, then the pre-charge module and the main negative relay of all battery clusters are turned on; it is determined whether the battery cluster voltage is the same as the positive bus and negative bus voltage; if so, the pre-charge relay KA6 in the pre-charge module is turned off (i.e. the pre-charge circuit is closed), the main positive relay KA1 is closed simultaneously, and then the circuit breaker QF is closed (i.e. the charging and discharging module circuit breaker is closed), and the main charging and discharging circuit of the energy storage compartment is established.

[0116] During the "self-powered mode" process (if you want to enable the self-powered mode and the energy storage prefabricated module has no external power supply, the energy storage prefabricated module needs to have startup power so that the self-powered function can be activated), such as Figure 3 As shown, the energy storage prefabricated module performs the following steps:

[0117] Energy storage compartment auxiliary systems powered on;

[0118] Energy storage compartment auxiliary system activated;

[0119] The energy storage compartment automatically powers on.

[0120] Continuously monitor whether the energy storage compartment has an external power supply;

[0121] If so, an external power supply will be used to power the energy storage compartment auxiliary system;

[0122] If not, the power consumption requirement of the energy storage compartment auxiliary system is detected, and the main positive relay KA1 and the main negative relay KA2 are closed; the output power of the DC / AC converter is dynamically adjusted according to the battery cluster voltage to convert the battery power into AC power for the auxiliary power supply circuit of the energy storage prefabricated compartment, so that the energy storage prefabricated compartment can still work in the event of a power grid failure.

[0123] In the above scheme, the circulating current suppression and energy recovery system effectively reduces circulating current by recovering and transferring the charge of battery clusters with excessively high voltage. The system can monitor the status of each battery cluster in real time and execute energy recovery strategies to balance the charge distribution within the battery clusters. Simultaneously, the recovered energy is used in the auxiliary power supply system of the energy storage prefabricated module (which can be stored in the UPS of the auxiliary power supply system), improving overall energy utilization efficiency.

[0124] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A battery cluster circulating current suppression and energy recovery system, characterized in that, include: A voltage acquisition module, and a charging / discharging module, a pre-charging module, and a suppression and recovery module connected to the voltage acquisition module; The voltage acquisition module is used to connect to the battery cluster and acquire the battery cluster voltage; The charging and discharging module is used to be installed between the battery cluster and the positive and negative busbars; The pre-charge module is also connected in parallel with the positive circuit of the charge / discharge module; The suppression and recovery module is also connected in parallel with the charging and discharging module; When the voltage of the battery cluster acquired by the voltage acquisition module is greater than or equal to a set threshold, the precharge module sends the DC current of the battery cluster to the suppression and recovery module, and the charge and discharge module is in the disconnected state. When the voltage of the battery cluster acquired by the voltage acquisition module is less than the set threshold, the charging and discharging module sends the DC power of the battery cluster into the positive and negative busbars, and the pre-charge module and the suppression recovery module are in the disconnected state.

2. The battery cluster circulating current suppression and energy recovery system according to claim 1, characterized in that: The charging and discharging module includes: a circuit breaker, a first fuse, a second fuse, a main positive relay, and a main negative relay; The circuit breaker, the main positive relay, and the first fuse are connected in series to form a positive circuit. The circuit breaker, the main negative relay, and the second fuse are connected in series to form a negative circuit. The circuit breaker is also used to connect to the positive and negative busbars.

3. The battery cluster circulating current suppression and energy recovery system according to claim 2, characterized in that: The precharge module includes a precharge resistor and a precharge relay connected in series; The end of the pre-charge resistor away from the pre-charge relay is connected to the line between the first fuse and the main positive relay. The end of the precharge relay furthest from the precharge resistor is connected to the connection between the circuit breaker and the main positive relay.

4. The battery cluster circulating current suppression and energy recovery system according to claim 3, characterized in that: When the battery cluster voltage acquired by the voltage acquisition module is greater than or equal to a set threshold, the circuit breaker and the main positive relay are in the open state; the precharge relay and the main negative relay are in the closed state.

5. The battery cluster circulating current suppression and energy recovery system according to claim 3, characterized in that: When the battery cluster voltage acquired by the voltage acquisition module is less than a set threshold, the circuit breaker, the main negative relay, and the main positive relay are in a closed state; the precharge relay is in an open state.

6. The battery cluster circulating current suppression and energy recovery system according to claim 2, characterized in that: The suppression and recovery module includes: a third fuse, a fourth fuse, a DC / AC converter, a third relay, a fourth relay, and a fifth relay; One end of the third fuse is connected to the connection between the circuit breaker and the main positive relay, and the other end is connected to the DC / AC converter. One end of the fourth fuse is connected to the connection between the circuit breaker and the main negative relay, and the other end is connected to the DC / AC converter. One end of the third, fourth, and fifth relays is connected to the DC / AC converter, and the other end is used to connect to the power supply equipment.

7. The battery cluster circulating current suppression and energy recovery system according to claim 6, characterized in that: The suppression and recovery module also includes a filter; the filter is located between the DC / AC converter and the third and fourth fuses.

8. The battery cluster circulating current suppression and energy recovery system according to claim 6, characterized in that: The suppression and recovery module further includes: a fifth fuse, a sixth fuse, and a seventh fuse; The fifth, sixth, and seventh fuses are connected in series with the third, fourth, and fifth relays, respectively.

9. A battery cluster circulating current suppression and energy recovery system according to claim 6, characterized in that: When the voltage of the battery cluster acquired by the voltage acquisition module is greater than or equal to the set threshold, the third fuse, the fourth fuse, the DC / AC converter, the third relay, the fourth relay and the fifth relay are all in working condition, and the DC / AC converter converts DC to AC.

10. A prefabricated energy storage module, characterized in that: The system includes a battery cluster circulating current suppression and energy recovery system as described in any one of claims 1-9 and an auxiliary power supply system; the input terminal of the auxiliary power supply system is connected to the output terminal of the suppression and recovery module.

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