High-voltage box and energy storage system

Abstract

The embodiment of the utility model 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 system, in particular to a high-voltage box and an energy storage system. BACKGROUND

[0002] The traditional high-voltage box often adopts a simple parallel or series connection mode to connect the battery pack, which may cause voltage imbalance between the loops during the charging and discharging process, which not only reduces the overall charging and discharging efficiency of the battery pack, but also may accelerate the aging speed of the battery and affect the long-term stable operation of the system. CONTENT OF THE UTILITY MODEL

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

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

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

[0006] a loop switching unit, 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;

[0007] a power supply connected to the other side of the loop switching unit;

[0008] a battery management unit, the loop 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 loop switching unit comprises 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 loop, 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 loop, 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 comprises 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 comprises a first branch and a second branch, the second circuit comprises a third branch and a fourth branch, the first circuit breaker comprises a first switch and a second switch, and the second circuit breaker comprises a third switch and a fourth switch.

[0014] The first switch, the first resistance wire and the first contactor are arranged on the first branch, the second switch is arranged on the second branch, and the first switch and the second switch are controlled in linkage; the third switch, the second resistance wire and the second contactor are arranged on the third branch, the fourth switch is arranged on the fourth branch, and the third switch and the fourth switch are controlled in linkage.

[0015] Optionally, in some embodiments of the present application, a first current sensor, a fifth switch and a sixth switch are further included, 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 arranged 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 unit is connected to the first branch, and the negative electrode of the first battery unit 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 comprises a plurality of first batteries connected in series, wherein the positive electrode of a first first battery is connected to one side of the circuit switching unit, and the negative electrode of a 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 comprises a plurality of second batteries connected in series, wherein the positive electrode of the first second battery is connected to one side of the loop switching unit, and the negative electrode of the last second battery is connected to the other side of the loop switching unit.

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

[0022] The embodiments of the present application provide 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. 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 connected to the first battery unit and the second battery unit respectively. The high-voltage box provided by the present application connects the power supply and the battery management unit through the loop switching unit, and can operate in parallel or single machine mode as needed. The circuit is disconnected when necessary to protect the battery pack and the circuit. Thus, the intelligent management of the high-voltage box double-loop system is realized, the charging and discharging efficiency of the battery pack is improved, and the problem of accelerating the aging speed of the battery and affecting the long-term stable operation of the system is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a structural schematic diagram of the high-voltage box provided by the embodiments of the present application;

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

[0026] Figure 3 is still another structural schematic diagram of the high-voltage box provided by the embodiments of the present application.

[0027] The implementation, functional features and advantages of the present application will be further described with reference to the drawings. Through the above drawings, the specific embodiments of the present application have been shown, and more detailed description will be given in the following. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application. In the case of no conflict, each of the following embodiments and technical features can be combined with each other.

[0029] It should be noted that, in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that comprises a list of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element, in addition, components, features, elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and the specific meaning thereof should be determined in combination with the explanation thereof in the specific embodiment or further in combination with the context in 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 for the convenience of description of the present application, and have no specific meaning. Therefore, "module", "component" or "unit" can be used interchangeably.

[0032] The following will be described in detail respectively. It should be noted that the description order of the following embodiments is not limited as the priority order of the embodiments.

[0033] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the high-voltage box provided by the embodiments of the present application is shown in the following figure.

[0034] In this embodiment, a high-voltage box 1 is provided, which can specifically include a first battery unit 10, a second battery unit 20, a loop 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 loop switching unit 30 through a first loop, the second battery unit 20 is connected to one side of the loop switching unit 30 through a second loop, the power supply 40 is connected to the other side of the loop switching unit 30, the loop 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] The first battery unit 10 can be composed of a plurality of battery monomers in series to provide the required voltage level. The first battery unit 10 is connected to one side of the loop switching unit 30 through the first loop, 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 loop switching unit. Optionally, in some embodiments of the present application, the first battery unit 10 can be charged or discharged according to the instructions of the battery management unit 50 during charging and discharging. In addition, the first battery unit 10 can operate together with the second battery unit 20 or operate alone. For example, in abnormal situations such as overcharging, overdischarging, 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 providing the required energy for the high-voltage box together with the first battery unit 10. The second battery unit 20 is connected to the loop switching unit 30 through the second loop, 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 loop 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 realize parallel or single operation.

[0037] The loop switching unit 30 can switch the connection mode between the first battery unit 10 and the second battery unit 20 according to the instructions of the battery management unit 50. For example, when an abnormal situation (such as overvoltage, undervoltage, overtemperature, etc.) is detected, the loop 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 loop switching unit 30 usually contains 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 can 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 with the first battery unit 10, and the other end of the first circuit breaker 301 is connected with 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 with the second battery unit 20, and the other end of the second circuit breaker 302 is connected with the second contactor 304.

[0040] 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, thereby protecting the battery unit and the system. 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, thereby protecting the battery unit and the system. The first contactor 303 can control the circuit connection between the first battery unit 10 and the power supply 40, realizing parallel operation or single-machine operation. The second contactor 304 can control the circuit connection between the second battery unit 20 and the power supply 40, realizing parallel operation 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 consistent, and the parallel operation is suitable. The BMS controls the first contactor 303 and the second contactor 304 to be closed, so that the first battery unit 10 and the second battery unit 20 are parallel to perform charging and discharging operations, thereby improving the efficiency and energy utilization rate.

[0042] When a slight imbalance is detected, the BMS determines the current direction and size that need to be adjusted according to the imbalance degree and direction. By accurately controlling the switching state of the first contactor 303 and the second contactor 304, a small current transfer between the circuits is realized, 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 the circuit with a lower total voltage (assuming the first battery unit 10) for preferential charging, control the first contactor 303 to be disconnected, and the second contactor 304 to remain disconnected or be adjusted according to actual needs, to ensure that the first battery unit 10 is charged in single-machine mode. In the discharging state, if the system is in a slight imbalance, the BMS will select the circuit with a higher total voltage (assuming the second battery unit 20) for discharging, and control the first contactor 303 and the second contactor 304 to realize single-machine discharging of the second battery unit 20.

[0043] Further, please continue to refer to Figure 2The loop switching unit 30 further comprises a first resistance wire 305 and a second resistance wire 306, wherein the first resistance wire 305 is arranged between the first circuit breaker 301 and the first contactor 303, and the second resistance wire 306 is arranged between the second circuit breaker 302 and the second contactor 304.

[0044] 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 first contactor 303 and the second contactor 304 are closed, and the first battery unit 10 and the second battery unit 20 are connected in parallel for charging and discharging operation. In the case of slight imbalance, the switching state of the first contactor 303 and the second contactor 304 can be controlled to realize a small current transfer between loops and gradually adjust the voltage difference to the normal range. For example, in the charging state, the BMS can select the loop with lower total voltage (such as the first battery unit 10) for preferential charging. In the discharging state, the BMS can select the loop with higher total voltage (such as the second battery unit 20) for discharging.

[0045] The first loop can include a first branch and a second branch, the second loop can include a third branch and a fourth branch, the first circuit breaker 301 can include a first switch 3011 and a second switch 3012, and the second circuit breaker 302 can include a third switch 3021 and a fourth switch 3022; wherein the first switch 3011, the first resistance wire 305, and the first contactor 303 are arranged on the first branch, the second switch 3012 is arranged on the second branch, and the first switch 3011 and the second switch 3012 are linked for joint control; the third switch 3021, the second resistance wire 306, and the second contactor 304 are arranged on the third branch, the fourth switch 3022 is arranged on the fourth branch, and the third switch 3021 and the fourth switch 3022 are linked for joint control.

[0046] 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 first contactor 303 and the second contactor 304 are closed, and the first battery unit 10 and the second battery unit 20 are connected in parallel for charging and discharging operation. In the case of slight imbalance, the switching state of the first contactor 303 and the second contactor 304 can be controlled to realize a small current transfer between loops and gradually adjust the voltage difference to the normal range. For example, if it is necessary to transfer current from the first battery unit 10 to the second battery unit 20, the first contactor 303 is closed to allow current to flow out of the first battery unit 10. At the same time, the second contactor 304 is closed to allow current to flow into the second battery unit 20.

[0047] Optionally, in some embodiments, the first switch 3011 and the second switch 3012 are controlled in linkage, ensuring that the circuits of the first branch and the second branch are turned on or off at the same time. The third switch 3021 and the fourth switch 3022 are controlled in linkage, ensuring that the circuits of the third branch and the fourth branch are turned on or off at the same time. Such linkage control mechanism can improve the safety and reliability of the circuit, preventing circuit problems caused by a single switch failure.

[0048] Please refer to Figure 2 The high-voltage box 1 of the embodiments of the present application can further include a first current sensor 601, a fifth switch 602, a sixth switch 603, and a resistor 604. 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, and 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, and 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 on-off of the current of the first branch according to the instruction of the battery management unit 50, which can be used for protecting or controlling the current flow. Since the sixth switch 603 is 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 of the first battery unit 10 and the second battery unit 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 be closed, so that the two battery units (the first battery unit 10 and the second battery unit 20) are connected in parallel for charging and discharging operation.

[0051] In the case of slight imbalance, the battery management unit 50 realizes the transfer of a small current between the loops by controlling the switching state of the first contactor 303 and the second contactor 304, and gradually adjusts the voltage difference to the 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, ensuring that the circuit can be automatically disconnected when the current is abnormal. In addition, the first resistor wire 305 and the second resistor wire 306 provide additional current detection and current limiting function, further improving the safety of the system.

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

[0053] The second current sensor 605 monitors the current passing through the second branch and feeds back 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, and the charging and discharging control of the second battery unit 20 is realized.

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

[0055] The battery management unit 50 analyzes and decides according to 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 on-off of the current 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, which is used 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 be closed, so that the two battery units are connected in parallel for charging and discharging operation. In the case of slight imbalance, the battery management unit 50 realizes the small current transfer between the loops by controlling the switching state of the first contactor 303, the second contactor 304 and the third contactor 606, and gradually adjusts the voltage difference to the normal range.

[0058] If a fault is detected in a branch, the corresponding circuit breaker or switch can quickly cut off the branch to prevent the fault from spreading to the entire system. It can be seen that the high-voltage box 1 provided in the embodiments of the present application can realize accurate control and management of the battery unit, and ensure the safe, stable and efficient operation of the system. The arrangement of the current sensor and the plurality of contactors provides the system with flexible current monitoring and control capability, 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 with the first branch, and the negative electrode of the first battery unit 20 is connected with 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 loop switching unit 30, and the negative electrode of the last first battery 101 is connected to the other side of the loop switching unit 30.

[0062] In the charging process, the current flows from the power supply 40, passes through the loop 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), sequentially flows through each first battery 101 connected in series, and finally flows out from the negative electrode of the last first battery 101, back to the loop switching unit 30 and the power supply 40, completing the charging cycle. In 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), sequentially flows through each first battery 101 connected in series, and then flows to the load (such as the power supply 40 or other external devices) through the loop switching unit 30, completing the discharging cycle.

[0063] In this way, the first battery unit 10 can safely and efficiently participate in the charging and discharging process of the system, and through the cooperative work of the loop switching unit 30 and the battery management unit 50, precise control and management of each battery 101 in the first battery unit 10 can be 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 electrode of the first second battery 201 is connected to one side of the loop switching unit 30, and the negative electrode of the last second battery 201 is connected to the other side of the loop switching unit 30.

[0065] In the charging process, the current flows from the power supply 40, passes through the loop 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), sequentially flows through each first battery 101 connected in series, and finally flows out from the negative electrode of the last first battery 101, back to the loop switching unit 30 and the power supply 40, completing the charging cycle. In 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), sequentially flows through each first battery 101 connected in series, and then flows to the load (such as the power supply 40 or other external devices) through the loop switching unit 30, completing the discharging cycle.

[0066] In the discharging process, the current flows out from the positive electrode of the second battery unit 20 (the positive electrode of the first second battery 201), sequentially passes through each series-connected second battery 201, and then flows to the load (such as the power supply 40 or other external equipment) through the loop switching unit 30, to complete the discharging 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 unit 10 and the second battery unit 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 be closed, so that the two battery units are connected in parallel for charging and discharging operation to improve efficiency and energy utilization. In the case of slight imbalance, the battery management unit 50 adjusts the voltage difference to the normal range by controlling the switching state of the first contactor 303 and the second contactor 304. In the charging state, if the system is slightly imbalanced, the battery management unit 50 can select the loop with lower total voltage (assuming the first battery unit 10) for preferential charging.

[0068] In the discharging state, if the system is slightly imbalanced, the battery management unit 50 can select the loop with higher total voltage (assuming the second battery unit 20) for discharging.

[0069] In this way, 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 cooperation of the loop switching unit 30 and the battery management unit 50 (BMS), precise 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 provided in the embodiment of the application comprises a first battery unit 10, a second battery unit 20, a loop 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 loop switching unit 30 through a first loop, the second battery unit 20 is connected to one side of the loop switching unit 30 through a second loop, the power supply 40 is connected to the other side of the loop switching unit 30, the loop 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 application connects the power supply 40 and the battery management unit 50 through the loop switching unit 30, and can operate in parallel or single mode as needed, and disconnects the circuit when necessary to protect the battery pack and the circuit, thereby realizing intelligent management of the high-voltage box dual-loop system, improving the charging and discharging efficiency of the battery pack, and avoiding the problem of accelerating the aging speed of the battery, which affects the long-term stable operation of the system.

[0071] Correspondingly, the embodiment of the present application also provides a kind of energy storage system, comprising the high pressure tank of any one of the above embodiments.

[0072] The above is only the embodiment of the present application, and does not limit the patent scope of the present application; any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, such as the mutual combination of technical features between 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 same or different reference numbers can be used to identify them. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0074] In the present application, the word "for example" is used to indicate "as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily interpreted as 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 above description is given. In the above description, various details are listed for the purpose of explanation.

[0075] It should be understood that those skilled in the art can realize the present application without using these specific details. In other embodiments, well-known structures and processes will not be described in detail to avoid unnecessary details making 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 broadest scope of the principles and characteristics disclosed in the present application.

[0076] The above describes in detail the high pressure tank and energy storage system provided by the embodiment of the present application. The principle and implementation of the present application are described by applying specific examples; the above embodiment is only used to help understand the method and core idea of the present application; for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed; in view of the above, the content of the specification should not be understood as limiting the present application.

Claims

1. A high-pressure box, characterized in that, include First battery cell and second battery cell; A circuit switching unit, wherein the first battery unit is connected to one side of the circuit switching unit via a first circuit, and the second battery unit is connected to one side of the circuit switching unit via a second circuit; A power supply, which is connected to the other side of the circuit switching unit; The battery management unit is connected to the circuit switching unit via the power supply. 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 installed 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 disposed 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-pressure 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 disposed between the first circuit breaker and the first contactor, and the second resistance wire is disposed between the second circuit breaker and the second contactor.

4. The high-pressure 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; The first switch, the first resistance wire, and the first contactor are all located on the first branch, the second switch is located on the second branch, and the first switch and the second switch are linked for control; the third switch, the second resistance wire, and the second contactor are all located on the third branch, and the fourth switch is located on the fourth branch, and the third switch and the fourth switch are linked for control.

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

6. The high-pressure box according to claim 4, characterized in that, The second branch is also equipped 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-pressure box according to claim 4, characterized in that, The positive terminal of the first battery cell is connected to the first branch, and the negative terminal of the first battery cell is connected to the second branch.

8. The high-pressure box according to claim 4, characterized in that, The positive terminal of the second battery cell is connected to the third branch, and the negative terminal of the second battery cell 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 multiple first batteries connected in series, wherein the positive terminal of the first first battery is connected to one side of the circuit switching unit, and the negative terminal of the last first battery is connected to the other side of the circuit switching unit.

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

11. An energy storage system, characterized in that, Includes the high-voltage box as described in any one of claims 1-10.

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