High-voltage box and energy storage system

Abstract

The embodiment of the invention discloses a high-voltage box and an energy storage system. The high-voltage box comprises a first battery unit, a second battery unit, a loop switching unit and a battery management unit, wherein the first battery unit is connected to one side of the loop switching unit through a first loop, and the second battery unit is connected to one side of the loop switching unit through a second loop; the power supply is connected to the other side of the loop switching unit; the loop switching unit is connected to the battery management unit through the power supply, and the battery management unit is also respectively connected with the first battery unit and the second battery unit. According to the high-voltage box provided by the invention, the power supply is connected with the battery management unit through the loop switching unit, parallel operation or single-machine operation can be carried out as required, and a circuit is disconnected when necessary to protect the safety of the battery pack and the circuit, so that intelligent management of a double-loop system of the high-voltage box is realized, and the charging and discharging efficiency of the battery pack can be improved; and the problems of aggravation of the aging speed of the battery and influence on long-term stable operation of the system are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery systems, and in particular to a high-voltage box and an energy storage system. Background Art

[0002] Traditional high-voltage boxes often use a simple parallel or series method to connect battery packs, which may cause voltage imbalance between the circuits during the charging and discharging process. This will not only reduce the overall charging and discharging efficiency of the battery pack, but may also accelerate the aging of the battery and affect the long-term stable operation of the system. Summary of the invention

[0003] The embodiments of the present application provide a high-voltage box and an energy storage system, which can improve the charging and discharging efficiency of a battery pack and avoid the problem of accelerating the aging of the battery and affecting the long-term stable operation of the system.

[0004] In a first aspect, an embodiment of the present application provides a high-voltage box, comprising

[0005] a first battery cell and a second battery cell;

[0006] A circuit switching unit, wherein the first battery unit is connected to one side of the circuit switching unit through a first circuit, and the second battery unit is connected to one side of the circuit switching unit through a second circuit;

[0007] A power supply, the power supply being connected to the other side of the loop switching unit;

[0008] A battery management unit, wherein the circuit switching unit is connected to the battery management unit through the power supply, and the battery management unit is also connected to the first battery unit and the second battery unit respectively.

[0009] Optionally, in some embodiments of the present application, the circuit switching unit includes a first circuit breaker, a second circuit breaker, a first contactor, and a second contactor;

[0010] The first circuit breaker and the first contactor are arranged on the first circuit, one end of the first circuit breaker is connected to the first battery unit, and the other end of the first circuit breaker is connected to the first contactor;

[0011] The second circuit breaker and the second contactor are arranged on the second circuit, one end of the second circuit breaker is connected to the second battery unit, and the other end of the second circuit breaker is connected to the second contactor.

[0012] Optionally, in some embodiments of the present application, the circuit switching unit further includes a first resistance wire and a second resistance wire, wherein the first resistance wire is arranged between the first circuit breaker and the first contactor, and the second resistance wire is arranged between the second circuit breaker and the second contactor.

[0013] Optionally, in some embodiments of the present application, the first circuit includes a first branch and a second branch, the second circuit includes a third branch and a fourth branch, the first circuit breaker includes a first switch and a second switch, and the second circuit breaker includes a third switch and a fourth switch;

[0014] Among them, the first switch, the first resistor and the first contactor are all arranged on the first branch, the second switch is arranged on the second branch, and the first switch is controlled in linkage with the second switch; the third switch, the second resistor and the second contactor are all arranged on the third branch, the fourth switch is arranged on the fourth branch, and the third switch is controlled in linkage with the fourth switch.

[0015] Optionally, in some embodiments of the present application, a first current sensor, a fifth switch and a sixth switch are further included, wherein the first current sensor and the fifth switch are arranged on the first branch, one end of the first current sensor is connected to the first contactor, the other end of the first current sensor is connected to the fifth switch, the sixth switch is arranged on the third branch, and the sixth switch is arranged in parallel with the fifth switch.

[0016] Optionally, in some embodiments of the present application, a second current sensor and a third contactor are further provided on the second branch, one end of the second current sensor is connected to the second switch, and the other end of the second current sensor is connected to the third contactor.

[0017] Optionally, in some embodiments of the present application, the positive electrode of the first battery cell is connected to the first branch, and the negative electrode of the first battery cell is connected to the second branch.

[0018] Optionally, in some embodiments of the present application, the positive electrode of the second battery unit is connected to the third branch, and the negative electrode of the second battery unit is connected to the fourth branch.

[0019] Optionally, in some embodiments of the present application, the first battery unit includes a plurality of first batteries connected in series, wherein the positive pole of the first first battery is connected to one side of the circuit switching unit, and the negative pole of the last first battery is connected to the other side of the circuit switching unit.

[0020] Optionally, in some embodiments of the present application, the second battery unit includes a plurality of second batteries connected in series, wherein the positive pole of the first second battery is connected to one side of the circuit switching unit, and the negative pole of the last second battery is connected to the other side of the circuit switching unit.

[0021] In a second aspect, an embodiment of the present application provides an energy storage system, comprising a high-voltage box provided in any embodiment of the present application.

[0022] The embodiment of the present application provides a high-voltage box and an energy storage system, the high-voltage box includes a first battery unit, a second battery unit, a circuit switching unit and a battery management unit; wherein the first battery unit is connected to one side of the circuit switching unit through a first circuit, and the second battery unit is connected to one side of the circuit switching unit through a second circuit; the power supply is connected to the other side of the circuit switching unit; the circuit switching unit is connected to the battery management unit through the power supply, and the battery management unit is also connected to the first battery unit and the second battery unit respectively. The high-voltage box provided in the present application connects the power supply to the battery management unit through the circuit switching unit, and can be operated in parallel or alone as needed, and disconnects the circuit when necessary to protect the battery pack and circuit safety. Thus, intelligent management of the dual-circuit system of the high-voltage box is realized, which can improve the charging and discharging efficiency of the battery pack and avoid the problem of aggravating the aging speed of the battery and affecting the long-term stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a high-voltage box provided in an embodiment of the present application;

[0025] Figure 2 is another structural schematic diagram of the high-voltage box provided in an embodiment of the present application;

[0026] Figure 3 This is another structural schematic diagram of the high-voltage box provided in an embodiment of the present application.

[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The above drawings have shown the clear embodiments of this application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0029] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0030] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0032] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0033] See also Figure 1 , Figure 1 A schematic diagram of the structure of the high-voltage box provided in an embodiment of the present application.

[0034] In the present embodiment, a high-voltage box 1 is provided, which may specifically include a first battery unit 10, a second battery unit 20, a circuit switching unit 30, a power supply 40 and a battery management unit 50; wherein the first battery unit 10 is connected to one side of the circuit switching unit 30 through a first circuit, the second battery unit 20 is connected to one side of the circuit switching unit 30 through a second circuit, the power supply 40 is connected to the other side of the circuit switching unit 30, the circuit switching unit 30 is connected to the battery management unit 50 through the power supply 40, and the battery management unit 50 is also connected to the first battery unit 10 and the second battery unit 20, respectively.

[0035] Among them, the first battery unit 10 can be composed of a plurality of battery cells connected in series to provide the required voltage level. The first battery unit 10 is connected to one side of the circuit switching unit 30 through the first circuit, so that it can be electrically connected to other parts of the system (such as the second battery unit 20 and the power supply 40) through the circuit switching unit. Optionally, in some embodiments of the present application, during charging and discharging, the first battery unit 10 can be charged or discharged according to the instructions of the battery management unit 50. In addition, the first battery unit 10 can be operated in parallel with the second battery unit 20, or alone. For example, in abnormal circumstances, such as overcharging, over-discharging, overheating or short circuit, the first battery unit 10 will be cut off by the battery management unit 50 to prevent damage and ensure system safety.

[0036] The second battery unit 20 is also responsible for storing electrical energy, and together with the first battery unit 10, provides the required energy for the high-voltage box. The second battery unit 20 is connected to the circuit switching unit 30 through the second circuit, and under the control of the battery management unit 50, the second battery unit 20 can be charged or discharged. Optionally, in some embodiments of the present application, the circuit switching unit 30 can control the connection between the second battery unit 20 and the power supply 40 according to the instructions of the battery management unit 50 to achieve parallel or single-machine operation.

[0037] The circuit switching unit 30 can switch the connection mode between the first battery unit 10 and the second battery unit 20 according to the instruction of the battery management unit 50. For example, when an abnormal situation (such as overvoltage, undervoltage, overtemperature, etc.) is detected, the circuit switching unit 30 can quickly cut off or change the circuit connection to protect the battery unit and the entire system from damage.

[0038] The circuit switching unit 30 generally includes a contactor or a relay. The contactor is an electromagnetic switch that can work under high current conditions, while the relay is suitable for low current control circuits.

[0039] Optionally, in some embodiments of the present application, please refer to Figure 2The circuit switching unit 30 may specifically include a first circuit breaker 301, a second circuit breaker 302, a first contactor 303 and a second contactor 304. The first circuit breaker 301 and the first contactor 303 are arranged on the first circuit, one end of the first circuit breaker 301 is connected to the first battery unit 10, and the other end of the first circuit breaker 301 is connected to the first contactor 303; the second circuit breaker 302 and the second contactor 304 are arranged on the second circuit, one end of the second circuit breaker 302 is connected to the second battery unit 20, and the other end of the second circuit breaker 302 is connected to the second contactor 304.

[0040] Among them, the first circuit breaker 301 provides overload or short circuit protection in the first circuit, ensuring that the circuit can be automatically disconnected when the current is abnormal, protecting the battery unit and the system safety. Similarly, the second circuit breaker 302 provides overload or short circuit protection in the second circuit, ensuring that the circuit can be automatically disconnected when the current is abnormal, protecting the battery unit and the system safety. The first contactor 303 can control the circuit connection between the first battery unit 10 and the power supply 40 to achieve parallel or single machine operation. The second contactor 304 can control the circuit connection between the second battery unit 20 and the power supply 40 to achieve parallel or single machine operation.

[0041] When the total voltage difference between the first battery unit 10 and the second battery unit 20 is less than or equal to 1% of the full scale range (FSR), the BMS determines that the voltages of the two circuits are basically the same and suitable for parallel operation. The BMS controls the first contactor 303 and the second contactor 304 to close, so that the first battery unit 10 and the second battery unit 20 are paralleled for charging and discharging operations to improve efficiency and energy utilization.

[0042] When a slight imbalance is detected, the BMS determines the current direction and size that need to be adjusted according to the degree and direction of the imbalance. By precisely controlling the switching state of the first contactor 303 and the second contactor 304, a small current transfer between the circuits is achieved, and the voltage difference is gradually adjusted to the normal range. For example, in the charging state, if the system is in a slight imbalance, the BMS will select a circuit with a lower total pressure (assuming it is the first battery unit 10) for priority charging, control the first contactor 303 to disconnect, and the second contactor 304 to remain disconnected or adjusted according to actual needs to ensure that the first battery unit 10 is charged alone. In the discharging state, if the system is in a slight imbalance, the BMS will select a circuit with a higher total pressure (assuming it is the second battery unit 20) for discharge, and achieve the single-machine discharge of the second battery unit 20 by controlling the first contactor 303 and the second contactor 304.

[0043] For further information, please refer to Figure 2The circuit switching unit 30 further includes a first resistor 305 and a second resistor 306 , wherein the first resistor 305 is arranged between the first circuit breaker 301 and the first contactor 303 , and the second resistor 306 is arranged between the second circuit breaker 302 and the second contactor 304 .

[0044] Among them, when the total voltage difference between the first battery cell 10 and the second battery cell 20 is less than or equal to 1% FSR, the first contactor 303 and the second contactor 304 are closed, and the first battery cell 10 and the second battery cell 20 are connected in parallel for charging and discharging operations. In the case of a slight imbalance, the switching state of the first contactor 303 and the second contactor 304 can be controlled to achieve a small current transfer between the circuits, and gradually adjust the voltage difference to a normal range. For example, in the charging state, the BMS can select a circuit with a lower total voltage (such as the first battery cell 10) for priority charging. In the discharging state, the BMS can select a circuit with a higher total voltage (such as the second battery cell 20) for discharging.

[0045] The first circuit may include a first branch and a second branch, the second circuit includes a third branch and a fourth branch, the first circuit breaker 301 includes a first switch 3011 and a second switch 3012, and the second circuit breaker 302 includes a third switch 3021 and a fourth switch 3022; wherein the first switch 3011, the first resistor 305 and the first contactor 303 are all arranged on the first branch, the second switch 3012 is arranged on the second branch, and the first switch 3011 is controlled in linkage with the second switch 3012; the third switch 3021, the second resistor 306 and the second contactor 304 are all arranged on the third branch, the fourth switch 3022 is arranged on the fourth branch, and the third switch 3021 is controlled in linkage with the fourth switch 3022.

[0046] When the total voltage difference between the first battery cell 10 and the second battery cell 20 is less than or equal to 1% FSR, the first contactor 303 and the second contactor 304 are closed, so that the first battery cell 10 and the second battery cell 20 are paralleled for charging and discharging operations. In the case of a slight imbalance, the switching state of the first contactor 303 and the second contactor 304 can be controlled to achieve a small current transfer between the circuits and gradually adjust the voltage difference to a normal range. For example, if it is necessary to transfer current from the first battery cell 10 to the second battery cell 20, the first contactor 303 is closed to allow current to flow out of the first battery cell 10. At the same time, the second contactor 304 is closed to allow current to flow into the second battery cell 20.

[0047] Optionally, in some embodiments, the first switch 3011 is controlled in linkage with the second switch 3012 to ensure that the circuits of the first branch and the second branch are connected or disconnected at the same time. The third switch 3021 is controlled in linkage with the fourth switch 3022 to ensure that the circuits of the third branch and the fourth branch are connected or disconnected at the same time. This linkage control mechanism can improve the safety and reliability of the circuit and prevent circuit problems caused by a single switch failure.

[0048] See also Figure 2 The high-voltage box 1 of the embodiment of the present application may further include a first current sensor 601, a fifth switch 602, a sixth switch 603 and a resistor 604, wherein the first current sensor 601 and the fifth switch 602 are arranged on the first branch, one end of the first current sensor 601 is connected to the first contactor 301, the other end of the first current sensor 601 is connected to the fifth switch 602, the sixth switch 603 is arranged on the third branch, the sixth switch 603 is arranged in series with the resistor 604, and the sixth switch 603 is arranged in parallel with the fifth switch 602. The first current sensor 601 is used to monitor the current passing through the first branch and feed back the current data to the battery management unit 50 so that the battery management unit 50 can monitor and control the current.

[0049] The fifth switch 602 controls the current on and off of the first branch according to the instruction of the battery management unit 50, which may be used for protection or control of current flow. Since the sixth switch 603 is connected in parallel with the fifth switch 602, the sixth switch 603 can be used for load switching or fault protection.

[0050] When the total voltage difference between the first battery cell 10 and the second battery cell 20 is less than or equal to 1% FSR, the battery management unit 50 controls the first contactor 303 and the second contactor 304 to close, so that the two battery cells (the first battery cell 10 and the second battery cell 20) can be charged and discharged in parallel.

[0051] In the case of a slight imbalance, the battery management unit 50 controls the switch state of the first contactor 303 and the second contactor 304 to achieve a small current transfer between the circuits and gradually adjust the voltage difference to a normal range. Optionally, in some embodiments of the present application, the first circuit breaker 301 and the second circuit breaker 302 provide overload or short circuit protection to ensure that the circuit can be automatically disconnected when the current is abnormal. In addition, the first resistance wire 305 and the second resistance wire 306 provide additional current detection and current limiting functions to further improve the safety of the system.

[0052] Optionally, in some embodiments of the present application, please refer to Figure 3A second current sensor 605 and a third contactor 606 are also provided on the second branch. One end of the second current sensor 605 is connected to the second switch 601 , and the other end of the second current sensor 605 is connected to the third contactor 606 .

[0053] The second current sensor 605 monitors the current passing through the second branch and feeds back the data to the battery management unit 50 so that the battery management unit 50 can monitor and control the current. According to the instruction of the battery management unit 50, the circuit connection of the second branch is controlled to realize the charge and discharge control of the second battery unit 20.

[0054] Specifically, the first current sensor 601 and the second current sensor 605 monitor the current of the first branch and the second branch respectively, and feed the data back to the battery management unit 50 .

[0055] The battery management unit 50 analyzes and makes decisions based on the monitored current information to control the charging and discharging process of the battery unit.

[0056] The fifth switch 602 and the third contactor 606 can control the current on and off of the first branch and the second branch according to the instruction of the BMS. The sixth switch 603 is connected in parallel with the fifth switch 602 to provide additional control or protection functions, such as load switching or fault protection.

[0057] The first contactor 303 and the second contactor 304 switch the connection mode between the first battery unit 10 and the second battery unit 20 according to the instruction of the BMS. When the total voltage difference between the first battery unit 10 and the second battery unit 20 is less than or equal to 1% FSR, the BMS controls the first contactor 303 and the second contactor 304 to close, so that the two battery units can be charged and discharged in parallel. In the case of slight imbalance, the battery management unit 50 controls the switching state of the first contactor 303, the second contactor 304 and the third contactor 606 to realize the transfer of small current between the circuits and gradually adjust the voltage difference to the normal range.

[0058] If a branch circuit is detected to have a fault, the corresponding circuit breaker or switch can quickly cut off the branch circuit to prevent the fault from spreading to the entire system. It can be seen that the high-voltage box 1 provided in the embodiment of the present application can achieve precise control and management of the battery unit to ensure the safe, stable and efficient operation of the system. The setting of the current sensor and multiple contactors provides the system with flexible current monitoring and control capabilities, further improving the reliability and protection level of the system.

[0059] Optionally, in some embodiments of the present application, please refer to Figure 3 The positive electrode of the first battery unit 10 is connected to the first branch, and the negative electrode of the first battery unit 20 is connected to the second branch.

[0060] Optionally, in some embodiments of the present application, please refer to Figure 3 , the positive electrode of the second battery unit 20 is connected to the third branch, and the negative electrode of the second battery unit 20 is connected to the fourth branch.

[0061] Optionally, in some embodiments of the present application, please refer to Figure 3 The first battery unit 10 includes a plurality of first batteries 101 connected in series, wherein the positive electrode of the first first battery 101 is connected to one side of the circuit switching unit 30, and the negative electrode of the last first battery 101 is connected to one side of the circuit switching unit.

[0062] During the charging process, the current flows in from the power source 40, passes through the circuit switching unit 30, and then flows into the positive electrode of the first battery unit 10 (the positive electrode of the first first battery 101), flows through each first battery 101 connected in series in turn, and finally flows out from the negative electrode of the last first battery 101, returns to the circuit switching unit 30 and the power source 40, completing the charging cycle. During the discharging process, the current flows out from the positive electrode of the first battery unit 10 (the positive electrode of the first first battery 101), flows through each first battery 101 connected in series in turn, and then flows to the load (such as the power source 40 or other external device) through the circuit switching unit 30, completing the discharging cycle.

[0063] As a result, the first battery unit 10 can safely and efficiently participate in the charging and discharging process of the system, and through the coordinated work of the circuit switching unit 30 and the battery management unit 50, accurate control and management of each battery 101 in the first battery unit 10 is achieved.

[0064] Optionally, in some embodiments of the present application, the second battery unit 20 includes a plurality of second batteries 201 connected in series, wherein the positive pole of the first second battery 201 is connected to one side of the circuit switching unit 30, and the negative pole of the last second battery 201 is connected to the other side of the circuit switching unit 30.

[0065] During the charging process, current flows in from the power supply 40, passes through the circuit switching unit 30, and then flows into the positive electrode of the second battery unit 20 (the positive electrode of the first second battery 201), flows through each second battery 201 connected in series in turn, and finally flows out from the negative electrode of the last second battery 201, returns to the circuit switching unit 30 and the power supply 40, completing the charging cycle.

[0066] During the discharge process, the current flows out from the positive electrode of the second battery unit 20 (the positive electrode of the first second battery 201), flows through each second battery 201 connected in series in turn, and then flows to the load (such as the power supply 40 or other external devices) through the circuit switching unit 30 to complete the discharge cycle. Among them, the second current sensor 605 monitors the current of the second branch and provides it to the battery management unit 50 for analysis and control. The second circuit breaker 302 provides overload or short circuit protection to ensure that the circuit can be automatically disconnected when the current is abnormal.

[0067] When the total voltage difference between the first battery cell 10 and the second battery cell 20 is less than or equal to 1% FSR, the battery management unit 50 controls the first contactor 303 and the second contactor 304 to close, so that the two battery cells are charged and discharged in parallel to improve efficiency and energy utilization. In the case of a slight imbalance, the battery management unit 50 controls the switching state of the first contactor 303 and the second contactor 304 to achieve a small current transfer between the circuits and gradually adjust the voltage difference to a normal range. In the charging state, if the system is in a slight imbalance, the battery management unit 50 can select a circuit with a lower total voltage (assuming it is the first battery cell 10) for priority charging.

[0068] In the discharge state, if the system is slightly unbalanced, the battery management unit 50 may select a circuit with a higher total voltage (assuming it is the second battery unit 20 ) for discharge.

[0069] Thus, the first battery unit 10 and the second battery unit 20 can safely and efficiently participate in the charging and discharging process of the system, and through the coordinated work of the circuit switching unit 30 and the battery management unit 50 (BMS), accurate control and management of the battery units are achieved. This design improves the flexibility, reliability and safety of the system.

[0070] The high-voltage box 1 provided in the embodiment of the present application includes a first battery unit 10, a second battery unit 20, a circuit switching unit 30, a power supply 40 and a battery management unit 50; wherein the first battery unit 10 is connected to one side of the circuit switching unit 30 through the first circuit, the second battery unit 20 is connected to one side of the circuit switching unit 30 through the second circuit, the power supply 40 is connected to the other side of the circuit switching unit 30, the circuit switching unit 30 is connected to the battery management unit 50 through the power supply 40, and the battery management unit 50 is also connected to the first battery unit 10 and the second battery unit 20 respectively. The high-voltage box provided in the present application connects the power supply 40 with the battery management unit 50 through the circuit switching unit 30, and can be operated in parallel or alone as needed, and the circuit can be disconnected when necessary to protect the battery pack and the circuit safety, thereby realizing the intelligent management of the high-voltage box dual-circuit system, which can improve the charging and discharging efficiency of the battery pack, and avoid the problem of aggravating the aging speed of the battery and affecting the long-term stable operation of the system.

[0071] Correspondingly, an embodiment of the present application also provides an energy storage system, comprising a high-voltage box according to any of the above embodiments.

[0072] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

[0073] In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0074] In this application, the word "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in this application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any person skilled in the art to implement and use the present application, the present application provides the above description. In the above description, various details are listed for the purpose of explanation.

[0075] It should be understood that those skilled in the art will recognize that the present application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0076] The above is a detailed introduction to a high-voltage box and an energy storage system provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A high-voltage box, characterized in that: include a first battery cell and a second battery cell; A circuit switching unit, wherein the first battery unit is connected to one side of the circuit switching unit through a first circuit, and the second battery unit is connected to one side of the circuit switching unit through a second circuit; A power supply, the power supply being connected to the other side of the loop switching unit; A battery management unit, wherein the circuit switching unit is connected to the battery management unit through the power supply, and the battery management unit is also connected to the first battery unit and the second battery unit respectively.

2. The high-voltage box according to claim 1, characterized in that: The circuit switching unit includes a first circuit breaker, a second circuit breaker, a first contactor and a second contactor; The first circuit breaker and the first contactor are arranged on the first circuit, one end of the first circuit breaker is connected to the first battery unit, and the other end of the first circuit breaker is connected to the first contactor; The second circuit breaker and the second contactor are arranged on the second circuit, one end of the second circuit breaker is connected to the second battery unit, and the other end of the second circuit breaker is connected to the second contactor.

3. The high-voltage box according to claim 2, characterized in that: The circuit switching unit further includes a first resistance wire and a second resistance wire, wherein the first resistance wire is arranged between the first circuit breaker and the first contactor, and the second resistance wire is arranged between the second circuit breaker and the second contactor.

4. The high-voltage box according to claim 2, characterized in that: The first circuit includes a first branch and a second branch, the second circuit includes a third branch and a fourth branch, the first circuit breaker includes a first switch and a second switch, and the second circuit breaker includes a third switch and a fourth switch; Among them, the first switch, the first resistor and the first contactor are all arranged on the first branch, the second switch is arranged on the second branch, and the first switch is controlled in linkage with the second switch; the third switch, the second resistor and the second contactor are all arranged on the third branch, the fourth switch is arranged on the fourth branch, and the third switch is controlled in linkage with the fourth switch.

5. The high-voltage box according to claim 4, characterized in that: It also includes a first current sensor, a fifth switch and a sixth switch, wherein the first current sensor and the fifth switch are arranged on the first branch, one end of the first current sensor is connected to the first contactor, the other end of the first current sensor is connected to the fifth switch, the sixth switch is arranged on the third branch, and the sixth switch is arranged in parallel with the fifth switch.

6. The high-voltage box according to claim 4, characterized in that: The second branch is also provided with a second current sensor and a third contactor, one end of the second current sensor is connected to the second switch, and the other end of the second current sensor is connected to the third contactor.

7. The high-voltage box according to claim 4, characterized in that: The positive electrode of the first battery unit is connected to the first branch, and the negative electrode of the first battery unit is connected to the second branch.

8. The high-voltage box according to claim 4, characterized in that: The positive electrode of the second battery unit is connected to the third branch, and the negative electrode of the second battery unit is connected to the fourth branch.

9. The high-voltage box according to any one of claims 1 to 8, characterized in that: The first battery unit includes a plurality of first batteries connected in series, wherein a positive electrode of a first first battery is connected to one side of the circuit switching unit, and a negative electrode of a last first battery is connected to the other side of the circuit switching unit.

10. The high-voltage box according to any one of claims 1 to 8, characterized in that: The second battery unit includes a plurality of second batteries connected in series, wherein a positive electrode of a first second battery is connected to one side of the circuit switching unit, and a negative electrode of a last second battery is connected to the other side of the circuit switching unit.

11. An energy storage system, characterized in that: It comprises a high-voltage box as described in any one of claims 1 to 10.

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