Battery pack, cascaded container module and three-phase power supply

Abstract

The utility model provides a battery pack, a cascade type container module and a three-phase power supply, the battery pack comprises a battery module, an energy conversion module and an alternating current port, the main positive end of the battery module is electrically connected with the input positive end of the energy conversion module; the negative output end of the energy conversion module is electrically connected with the main negative end of the battery module, and the positive output end of the energy conversion module is electrically connected with the input end of the alternating current port; the energy conversion module converts electric energy of the battery module and supplies power to the outside through the alternating current port, direct current of the battery module can be directly converted into sine alternating current through the arranged energy conversion module, the battery pack directly outputs alternating current to the outside, and a secondary system can be directly integrated in the energy storage container. And the overall efficiency and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage system technical field especially relates to a battery pack, cascading container module and three -phase power supply. BACKGROUND

[0002] In order to find better energy storage solution, improve the benefit of energy storage system, energy storage system is in the continuous replacement, derived different system structure, towards more controllable, simple, efficient direction development, in today's high voltage cascading energy storage system, power semiconductor device as the main device of energy storage system main circuit, the task is more and more important.

[0003] The utility model discloses a kind of energy storage devices based on modular multilevel hybrid converter, including three energy storage modules and H bridge module, the energy storage module includes battery and at least two energy storage units, the output end of the energy storage unit is mutually connected in series, the output end of the battery is connected with the input end of energy storage unit, the output end of three energy storage modules is respectively connected with the different input end of H bridge module, the H bridge module is equipped with three-phase output end.Energy storage unit is connected with battery as structure unit alone to facilitate the establishment of energy storage module, after the output end of energy storage unit is connected in series, output high voltage, three energy storage modules are connected with the different input end of H bridge module, and the three-phase output end of H bridge module can be connected with external network, and H bridge module is used for the conversion between direct current and alternating current, can convert the alternating current of external network into direct current and charge the battery of energy storage module, and the energy of battery in energy storage module can be converted into alternating current and provide load for external network.

[0004] The above existing scheme needs to realize the conversion between direct current and alternating current by the complex connection of multiple energy storage modules and H bridge module, and after energy storage unit is connected in series and outputs high voltage, still needs to rely on H bridge module to carry out electric energy conversion, which is not convenient for directly integrating secondary system in energy storage container in this process, increases the complexity and energy consumption of system, reduces the overall efficiency and reliability of system. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a kind of battery pack, cascading container module and three -phase power supply, can the direct current of battery module be directly converted into sinusoidal alternating current, battery pack directly outputs alternating current to the outside, directly can integrate secondary system in energy storage container, improve the overall efficiency and reliability of system.

[0006] The technical scheme of the utility model is realized as follows: the utility model provides a kind of battery pack, including battery module, energy conversion module and alternating current port, wherein,

[0007] The main positive terminal of battery module is electrically connected with the input positive terminal of energy conversion module;

[0008] The negative output end of the energy conversion module is electrically connected with the main negative end of the battery module, and the positive output end of the energy conversion module is electrically connected with the input end of the alternating current port;

[0009] The energy conversion module converts the electric energy of the battery module, and supplies power to the outside through the alternating current port.

[0010] On the basis of the above technical scheme, preferably, it further comprises a first fuse, a main contactor and a first bypass contactor, wherein the main positive end of the battery module is electrically connected with the first fuse, the other end of the first fuse is electrically connected with one end of the contact of the main contactor, the other end of the contact of the main contactor is electrically connected with the input positive end of the energy conversion module, the positive output end of the energy conversion module is electrically connected with the first bypass contactor, and the contacts of the first bypass contactor are respectively electrically connected with the corresponding alternating current ports.

[0011] On the basis of the above technical scheme, preferably, the energy conversion module comprises a capacitor C1, an inductor L1, an insulated gate bipolar transistor M1, an insulated gate bipolar transistor M2, an insulated gate bipolar transistor M3 and an insulated gate bipolar transistor M4, wherein one end of the contact of the main contactor away from the battery module is respectively electrically connected with the capacitor C1, the source of the insulated gate bipolar transistor M1 and the source of the insulated gate bipolar transistor M2, the drain of the insulated gate bipolar transistor M1 is respectively electrically connected with one end of the contact of the first bypass contactor, one alternating current port and the source of the insulated gate bipolar transistor M3, the drain of the insulated gate bipolar transistor M2 is respectively electrically connected with the inductor L1 and the source of the insulated gate bipolar transistor M4, the other end of the inductor L1 is electrically connected with the other end of the contact of the first bypass contactor and the other alternating current port, and the sources of the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4 and the other end of the capacitor C1 are all electrically connected with the main negative end of the battery module.

[0012] On the basis of the above technical scheme, preferably, it further comprises a BMS battery control unit and a PCMS energy conversion control unit, wherein the BMS battery control unit is electrically connected with the battery module, is used for collecting the voltage and temperature of each cell in the battery module and the total voltage of the battery module, and the PCMS energy conversion control unit is electrically connected with the coils of the main contactor and the first bypass contactor and the bases of the insulated gate bipolar transistor M1, the insulated gate bipolar transistor M2, the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4, is used for respectively controlling the contactor to be disconnected or connected and the energy conversion module to be converted in the electric energy state.

[0013] On the basis of the above technical scheme, preferably, the liquid cooling plate is further provided, wherein one side of the liquid cooling plate is provided with a liquid outlet and a liquid inlet in communication, the other end of the liquid outlet and the liquid inlet is in communication with an external liquid supply device, the battery module and the energy conversion module are both arranged on the liquid cooling plate, and a cooling medium flows in the liquid cooling plate to take away the heat of the battery module and the energy conversion module.

[0014] In a second aspect, the utility model also provides a cascade type container module, including three phase branch, each phase branch all includes a plurality of battery pack, current sensor, second fuse and disconnecting switch as described above, wherein,

[0015] The AC ports of the plurality of battery packs are electrically connected in sequence from the first end to the last end, the AC port of the battery pack at the last end is electrically connected to the input end of the current sensor, the output end of the current sensor is electrically connected to one end of the second fuse, the other end of the second fuse is electrically connected to one end of the disconnecting switch, and the other end of the disconnecting switch is the output end of the branch.

[0016] On the basis of the above technical scheme, preferably, the utility model further includes a lightning arrester, wherein the AC port of the battery pack at the end of each phase branch is also electrically connected to one end of the lightning arrester, the other end of the lightning arrester is grounded, and the lightning arrester is used for preventing damage caused by lightning.

[0017] On the basis of the above technical scheme, preferably, the utility model further includes three second bypass contactors, wherein the AC ports of the battery packs at the first end of the three-phase branches are respectively electrically connected to one end of the contact of the corresponding second bypass contactor, the other end of the contact of the second bypass contactor is respectively electrically connected to the output end of the corresponding branch, and the second bypass contactor is used for cutting off the entire cascade type container module.

[0018] On the basis of the above technical scheme, preferably, the utility model further includes an EMS energy management module, wherein the PCMS energy conversion control unit, the second bypass contactor, the current sensor, the disconnecting switch and the lightning arrester are all in communication connection with the EMS energy management module, and the EMS energy management module is used for collecting or controlling the action signal of each component.

[0019] In a third aspect, the utility model also provides a three-phase power supply, including a plurality of cascade type container modules as described above, wherein the three-phase branches of the plurality of cascade type container modules are electrically connected in sequence from the first end to the last end, and the output ends of the three-phase branches of the cascade type container modules at the last end are commonly connected, to form the three-phase power supply.

[0020] The battery pack, the cascade type container module and the three-phase power supply of the utility model have the following beneficial effects compared with the prior art:

[0021] (1) Through the energy conversion module set, the direct current of the battery module can be directly converted into sinusoidal alternating current, and the battery pack directly outputs alternating current, so that the integrated secondary system can be directly realized in the energy storage container, thereby improving the overall efficiency and reliability of the system;

[0022] (2) Through the modular design of the cascade container module, the maintenance cost of the system is reduced, the scalability and flexibility of the system are improved, and the operation efficiency and reliability of the system are improved;

[0023] (3) By increasing the second bypass contactor, the reliability of the cascade container module in dealing with component failure or system anomaly is improved, that is, even if a component fails, the system can still operate by bypassing the component, thereby reducing downtime and potential losses and reducing maintenance complexity and cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 is the circuit diagram of the battery pack of the present application;

[0026] Figure 2 is the circuit diagram of the cascade container module of the present application;

[0027] Figure 3 is the circuit diagram of the three-phase power supply of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] As Figure 1As shown, the battery pack includes a battery module 1, an energy conversion module 2 and an alternating current port 3, wherein the main positive end of the battery module 1 is electrically connected with the input positive end of the energy conversion module 2; the negative output end of the energy conversion module 2 is electrically connected with the main negative end of the battery module 1, and the positive output end of the energy conversion module 2 is electrically connected with the input end of the alternating current port 3; the energy conversion module 2 converts the electric energy of the battery module 1, and supplies power to the outside through the alternating current port 3.

[0030] It should be noted that the battery module 1 is the energy storage unit of the whole battery pack, which is composed of a plurality of battery cells in series and parallel to provide sufficient electric energy, and the energy conversion module 2 is responsible for converting the direct current electric energy stored in the battery module 1 into alternating current electric energy, when the external device needs to obtain electric energy through the alternating current port 3, the energy conversion module 2 will start working, and the direct current electric energy provided by the battery module 1 is converted into alternating current electric energy, and the alternating current electric energy converted by the energy conversion module 2 is output to the external device through the alternating current port 3.

[0031] In the embodiment, the direct current of the battery module 1 can be directly converted into sinusoidal alternating current by arranging the energy conversion module 2 in the battery pack, the battery pack directly outputs alternating current to the outside, and the secondary system can be integrated in the energy storage container, thereby improving the overall efficiency and reliability of the system.

[0032] In the embodiment, the battery pack further includes a first fuse 4, a main contactor 5 and a first bypass contactor 6, wherein the main positive end of the battery module 1 is electrically connected with the first fuse 4, the other end of the first fuse 4 is electrically connected with one end of the contact of the main contactor 5, the other end of the contact of the main contactor 5 is electrically connected with the input positive end of the energy conversion module 2, the positive output end of the energy conversion module 2 is electrically connected with the first bypass contactor 6, and the contacts of the first bypass contactor 6 are respectively electrically connected with the corresponding alternating current ports 3.

[0033] It should be noted that the first fuse 4 is connected between the main positive terminal of the battery module 1 and the main contactor 5, which is the first protection barrier of the internal circuit of the battery pack. When an overcurrent or short circuit fault occurs in the battery pack, the first fuse 4 can quickly melt and cut off the fault circuit, thereby preventing the battery module 1 from being damaged and ensuring the safety of the entire battery pack. The main contactor 5 is responsible for controlling the on-off of the circuit between the battery module 1 and the energy conversion module 2. Under normal circumstances, the main contactor 5 remains closed to enable the battery module 1 to provide power to the energy conversion module 2. When the circuit needs to be disconnected, the contacts of the main contactor 5 will quickly open to ensure electrical isolation between the battery module 1 and the energy conversion module 2. Under normal circumstances, the first bypass contactor 6 remains closed to enable the AC power output by the energy conversion module 2 to be smoothly transmitted to the AC port 3. When the main contactor 5 or the energy conversion module 2 fails, the first bypass contactor 6 can quickly open to ensure that the failure does not affect other parts of the battery pack or external devices.

[0034] The battery module 1 in the embodiment provides DC power, which is transmitted to the energy conversion module 2 through the first fuse 4 and the main contactor 5. The energy conversion module 2 converts the DC power into sinusoidal AC power and outputs it to the AC port 3 through the first bypass contactor 6. External devices obtain power through the AC port 3 to achieve normal operation. The first fuse 4, the main contactor 5, and the first bypass contactor 6 improve the safety and reliability of the battery pack.

[0035] The energy conversion module 2 in the embodiment includes a capacitor C1, an inductor L1, an insulated gate bipolar transistor M1, an insulated gate bipolar transistor M2, an insulated gate bipolar transistor M3, and an insulated gate bipolar transistor M4. The contact end of the main contactor 5 away from the battery module 1 is electrically connected to the capacitor C1 and the source electrodes of the insulated gate bipolar transistor M1 and the insulated gate bipolar transistor M2. The drain electrode of the insulated gate bipolar transistor M1 is electrically connected to the contact end of the first bypass contactor 6, an AC port 3, and the source electrode of the insulated gate bipolar transistor M3. The drain electrode of the insulated gate bipolar transistor M2 is electrically connected to the inductor L1 and the source electrode of the insulated gate bipolar transistor M4. The other end of the inductor L1 is electrically connected to the other contact end of the first bypass contactor 6 and another AC port 3. The source electrodes of the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4 and the other end of the capacitor C1 are electrically connected to the main negative terminal of the battery module 1.

[0036] It should be noted that the capacitor C1 plays a role in filtering and energy storage in the circuit, which helps to stabilize the DC input voltage and provide transient current support during energy conversion. The inductor L1, together with the insulated gate bipolar transistors M1, M2, M3 and M4, forms the core part of the inverter circuit. By changing the on and off state of the insulated gate bipolar transistors, the conversion of DC to AC power is realized. The inductor L1 stores and releases energy during the energy conversion process, helping to form the waveform of the AC output voltage. The four insulated gate bipolar transistors M1, M2, M3 and M4 are alternately turned on and off at a certain frequency and duty cycle under the drive of the control circuit, forming an H-bridge circuit. By adjusting the on state of the insulated gate bipolar transistors, the current change in the inductor L1 can be controlled, and in turn an AC voltage is generated at the output.

[0037] In this embodiment, when the insulated gate bipolar transistor M1 and the insulated gate bipolar transistor M4 are simultaneously turned on, the current flows from the positive electrode of the battery module 1 through the insulated gate bipolar transistor M1, the inductor L1 and the insulated gate bipolar transistor M4 back to the negative electrode of the battery module 1. At this time, the inductor L1 begins to store energy. When the insulated gate bipolar transistor M1 and the insulated gate bipolar transistor M4 are turned off, and the insulated gate bipolar transistor M2 and the insulated gate bipolar transistor M3 are turned on, the energy in the inductor L1 is released to the output, forming a reverse current. By constantly changing the on state of the insulated gate bipolar transistors, a continuous AC voltage waveform can be generated at the output. At this time, the battery discharges externally. When the battery is charging, the main contactor 5 is closed, and the H-bridge circuit formed by the four insulated gate bipolar transistors rectifies the sinusoidal AC power. After filtering through the capacitor C1, the sinusoidal AC power is converted into stable DC power, which charges the battery.

[0038] Through efficient DC to AC power conversion, the battery pack realizes AC power supply to external devices. In addition, the use of insulated gate bipolar transistors as switching elements makes the circuit have the advantages of fast response speed, high efficiency and low power consumption. Furthermore, the capacitor C1 and the inductor L1 further improve the stability and reliability of the circuit, and improve the stability of the DC to AC power conversion.

[0039] The embodiment also includes a BMS battery control unit 7 and a PCMS energy conversion control unit 8. The BMS battery control unit 7 is electrically connected to the battery module 1 for collecting the voltage and temperature of each cell in the battery module 1 and the total voltage of the battery module 1. The PCMS energy conversion control unit 8 is electrically connected to the coils of the main contactor 5 and the first bypass contactor 6, and the bases of the insulated gate bipolar transistors M1, M2, M3 and M4, for respectively controlling the contactor to be disconnected or connected, and the energy state conversion of the energy conversion module 2.

[0040] It should be noted that the control system of the battery pack includes a BMS battery control unit 7 and a PCMS energy conversion control unit 8, the BMS battery control unit 7 collects the voltage and temperature of the battery cell in the battery module 1 and the total voltage of the battery module 1, and performs data calculation and analysis, and then sends the data to the PCMS energy conversion control unit 8, the PCMS energy conversion control unit 8 controls the energy conversion module 2, the main contactor 5 and the first bypass contactor 6, according to the state of the battery module 1 and the external power demand, the PCMS energy conversion control unit 8 can control the disconnection or connection of the main contactor 5 and the first bypass contactor 6, so as to realize the on-off control of the circuit between the battery module 1 and the energy conversion module 2, and by controlling the on-off state of the insulated gate bipolar transistors M1, M2, M3 and M4, the PCMS can accurately adjust the output voltage, current and frequency of the energy conversion module 2 to meet the power demand of the external equipment, and by setting the on-off detection point on both sides of the contactor, the on-off state of the main contactor 5 and the first bypass contactor 6 can be detected, so that whether the contactor sticking occurs can be identified.

[0041] The embodiment also includes a liquid cooling plate 9, wherein one side of the liquid cooling plate 9 is provided with a liquid outlet and a liquid inlet in communication, the other end of the liquid outlet and the liquid inlet is in communication with an external liquid supply device, the battery module 1 and the energy conversion module 2 are arranged on the liquid cooling plate 9, and a cooling medium flows in the liquid cooling plate 9 to take away the heat of the battery module 1 and the energy conversion module 2.

[0042] It should be noted that the liquid cooling plate 9 can control the temperature of the battery module 1 and the energy conversion module 2 within a set range.

[0043] As shown in Figure 2 The second aspect, the utility model also provides a kind of cascade type container module, including three-phase branch, each phase branch includes several battery packs as described above, current sensor 10, second fuse 11 and disconnecting switch 12, wherein,

[0044] The AC port 3 of the plurality of battery packs is electrically connected in head-tail order, the AC port 3 of the last battery pack is electrically connected with the input end of the current sensor 10, the output end of the current sensor 10 is electrically connected with one end of the second fuse 11, the other end of the second fuse 11 is electrically connected with one end of the disconnecting switch 12, and the other end of the disconnecting switch 12 is used as the output end of the branch.

[0045] It should be noted that the cascade type container module contains three independent power branches, respectively corresponding to the A, B and C three phases of the power system, each branch contains a plurality of battery packs, these battery packs are connected end to end through their AC ports 3 to form a series battery pack, a current sensor 10 is connected at the end of the battery pack, which is used to monitor the current in the branch in real time to ensure that the power system operates within a safe range, the second fuse 11 is used to disconnect the main circuit in case of overload or short circuit to prevent equipment damage or fire and other safety accidents, the disconnecting switch 12 is used to disconnect and connect the main circuit with the previous container in order to maintain, repair or replace faulty components. At the same time, it can also provide additional electrical isolation to ensure the safety of the operator, wherein the disconnecting switch 12 has an electric operating mechanism.

[0046] Among them, the cascade type container module adopts modular design, which reduces the maintenance cost of the system, improves the scalability and flexibility of the system, and improves the operation efficiency and reliability of the system.

[0047] The cascade type container module in this embodiment further comprises a lightning arrester 13, wherein the AC port 3 of the battery pack at the end of each phase branch is also electrically connected to one end of the lightning arrester 13, and the other end of the lightning arrester is grounded, which is used to prevent damage caused by lightning.

[0048] The cascade type container module in this embodiment further comprises three second bypass contactors 14, wherein the AC port 3 of the battery pack at the head of each three-phase branch is electrically connected to one end of the corresponding second bypass contactor 14, and the other end of each second bypass contactor 14 is electrically connected to the output end of the corresponding branch, which is used to cut off the entire cascade type container module.

[0049] It should be noted that by adding the second bypass contactor 14, the reliability of the cascade type container module in dealing with component failure or system abnormality has been improved, even if a component has a problem, the system can also maintain operation by bypassing the component, thereby reducing downtime and potential losses, and reducing the complexity and cost of maintenance.

[0050] The cascade type container module in this embodiment further comprises an EMS energy management module 15, wherein each PCMS energy conversion control unit 8, second bypass contactor 14, current sensor 10, disconnecting switch 12 and lightning arrester 13 are in communication connection with the EMS energy management module 15, which is used to collect or control the action signal of each component.

[0051] It should be noted that the arrester 13 can feed back the state to the EMS energy management module 15 to determine whether replacement is needed, the current sensor 10 is used to measure the current in the main loop and transmit a signal to the EMS energy management module 15, the second fuse 11 is used to disconnect the main loop in the event of overload or short circuit, and the state is fed back to the EMS energy management module 15 to determine whether replacement is needed, and the disconnecting switch 12 can be controlled to close and open by the EMS energy management module 15, and the EMS energy management module 15 in the container communicates with the PCMS energy conversion control unit 8 in each phase battery pack to make the PCMS energy conversion control unit 8 output correct PWM signals to control the energy conversion module 2 to output the same phase, frequency and amplitude, and control the frequency and amplitude of each phase to be the same and the phase difference to be 120 degrees.

[0052] As shown in Figure 3 The utility model discloses a kind of three-phase power supply, including a plurality of cascaded container modules as described above, wherein the three-phase branch of a plurality of cascaded container modules is sequentially electrically connected in head-tail order, and the output end between the three-phase branch of the cascaded container module at the end is commonly connected, to constitute three-phase power supply.

[0053] It should be noted that the plurality of cascaded container modules are connected in head-tail order, and the three-phase ends are star-connected at the end, to constitute three-phase power supply, and a specific number of containers can constitute a three-phase power supply of a specific voltage level, without the need for a step-up transformer to step up voltage, and can be directly connected to a substation and other sites for grid connection, improving the efficiency of the system.

[0054] Working principle:

[0055] When external equipment needs to obtain electrical energy through alternating current, the on and off states of the insulated gate bipolar transistors M1, M2, M3 and M4 are controlled to form an H-bridge circuit, and then a continuous alternating voltage waveform is generated at the output end. The AC ports 3 of a plurality of battery packs are sequentially electrically connected in head-tail order to form a series battery pack, and a current sensor 10, a second fuse 11 and a disconnecting switch 12 are connected at the end of the battery pack to form a single-phase branch. Three single-phase branches are formed to form a cascaded container module. The head-tail order of a plurality of cascaded container modules is connected, and the output ends of the three-phase branches at the end are star-connected to form a three-phase power supply.

[0056] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included within the scope of protection of the utility model.

Claims

1. A battery pack, characterized by, The battery module (1), the energy conversion module (2) and the AC port (3) are included, wherein, The main positive terminal of the battery module (1) is electrically connected with the input positive terminal of the energy conversion module (2); The negative output terminal of the energy conversion module (2) is electrically connected with the main negative terminal of the battery module (1), and the positive output terminal of the energy conversion module (2) is electrically connected with the input terminal of the AC port (3); The energy conversion module (2) converts the electric energy of the battery module (1) and supplies power to the outside through the AC port (3).

2. The battery pack of claim 1, wherein: The first fuse (4), the main contactor (5) and the first bypass contactor (6) are further included, wherein, the main positive terminal of the battery module (1) is electrically connected with the first fuse (4), the other end of the first fuse (4) is electrically connected with one end of the contact of the main contactor (5), the other end of the contact of the main contactor (5) is electrically connected with the input positive terminal of the energy conversion module (2), the positive output terminal of the energy conversion module (2) is electrically connected with the first bypass contactor (6), and the contacts of the first bypass contactor (6) are respectively electrically connected with the corresponding AC ports (3).

3. The battery pack of claim 2, wherein: The energy conversion module (2) includes the capacitor C1, the inductor L1, the insulated gate bipolar transistor M1, the insulated gate bipolar transistor M2, the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4, wherein, one end of the contact of the main contactor (5) away from the battery module (1) is respectively electrically connected with the capacitor C1, the source of the insulated gate bipolar transistor M1 and the source of the insulated gate bipolar transistor M2, the drain of the insulated gate bipolar transistor M1 is respectively electrically connected with one end of the contact of the first bypass contactor (6), one AC port (3) and the source of the insulated gate bipolar transistor M3, the drain of the insulated gate bipolar transistor M2 is respectively electrically connected with the inductor L1 and the source of the insulated gate bipolar transistor M4, the other end of the inductor L1 is electrically connected with the other end of the contact of the first bypass contactor (6) and the other AC port (3), and the sources of the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4 and the other end of the capacitor C1 are all electrically connected with the main negative terminal of the battery module (1).

4. The battery pack of claim 2, wherein: The BMS battery control unit (7) and the PCMS energy conversion control unit (8) are further included, wherein, the BMS battery control unit (7) is electrically connected with the battery module (1) and is used for collecting the voltage and temperature of each cell in the battery module (1) and the total voltage of the battery module (1), the PCMS energy conversion control unit (8) is electrically connected with the coils of the main contactor (5) and the first bypass contactor (6) and the bases of the insulated gate bipolar transistor M1, the insulated gate bipolar transistor M2, the insulated gate bipolar transistor M3 and the insulated gate bipolar transistor M4, and is used for respectively controlling the contactor to be disconnected or connected and the state conversion of the electric energy of the energy conversion module (2).

5. The battery pack of claim 1, wherein: Further comprising a liquid cooling plate (9), wherein one side of the liquid cooling plate (9) is provided with a liquid outlet and a liquid inlet in communication, the other end of the liquid outlet and the liquid inlet is in communication with an external liquid supply device, the battery module (1) and the energy conversion module (2) are arranged on the liquid cooling plate (9), and a cooling medium flows in the liquid cooling plate (9) to take away the heat of the battery module (1) and the energy conversion module (2).

6. A cascade type container module characterized by: Each phase branch comprises a plurality of battery packs as claimed in any one of claims 1-5, a current sensor (10), a second fuse (11) and a disconnector (12), wherein, The AC ports (3) of the plurality of battery packs are sequentially connected in a head-to-tail manner, the AC port (3) of the battery pack at the end is electrically connected to the input end of the current sensor (10), the output end of the current sensor (10) is electrically connected to one end of the second fuse (11), the other end of the second fuse (11) is electrically connected to one end of the disconnector (12), and the other end of the disconnector (12) is the output end of the branch.

7. The cascade type container module according to claim 6, wherein: Further comprising a lightning arrester (13), wherein the AC port (3) of the battery pack at the end of each phase branch is also electrically connected to one end of the lightning arrester (13), and the other end of the lightning arrester is grounded, for preventing damage caused by lightning.

8. The cascade type container module according to claim 7, wherein: Further comprising three second bypass contactors (14), wherein the AC ports (3) of the battery packs at the first end of the three-phase branches are respectively electrically connected to one end of the corresponding second bypass contactor (14), and the other end of the second bypass contactor (14) is respectively electrically connected to the output end of the corresponding branch, for cutting off the entire cascade container module.

9. The cascade container module according to claim 8, characterized in that: Further comprising an EMS energy management module (15), wherein each PCMS energy conversion control unit (8), second bypass contactor (14), current sensor (10), disconnector (12) and lightning arrester (13) are in communication connection with the EMS energy management module (15), for collecting or controlling the action signals of each component.

10. A three-phase power supply characterized by: The cascade container module comprises a plurality of cascade container modules as claimed in any one of claims 6-9, wherein the three-phase branches of the plurality of cascade container modules are sequentially connected in a head-to-tail manner, and the output ends of the three-phase branches of the cascade container modules at the end are commonly connected, to form a three-phase power supply.

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