A grid-connected energy storage battery

Abstract

The present invention relates to the technical field of energy storage systems, and in particular to a grid-connected energy storage battery, which is applied to an energy storage system. The grid-connected energy storage battery comprises a battery module, a DC-DC buck-boost power control module, a P+P short-circuit detection control module, an MCU control module and a communication module; the battery module is connected to the DC-DC buck-boost power control module and the P+P short-circuit detection control module, the DC-DC buck-boost power control module and the P+P short-circuit detection control module are respectively connected to the MCU control module, the MCU control module is connected to the communication module, and the communication module is connected to an energy storage system; the DC-DC buck-boost power control module is connected to a P+ end and a P-end of an energy storage system; the P+P short-circuit detection control module is connected to a P+ end and a P-end of an energy storage system; when a grid-connected energy storage battery fails, the entire energy storage system does not need to stop working, and the grid-connected energy storage battery does not need to be replaced, and the unloading and off-grid functions of the faulty grid-connected energy storage battery can be completed, without affecting the work of the entire energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a grid-connected energy storage battery. Background Art

[0002] At present, grid-connected or networked energy storage systems rely on the voltage superposition of battery modules to output the total voltage. For example, the rated output voltage of a grid-connected or networked energy storage system is 480V, and the total output voltage of a single energy storage battery is 48V. Therefore, the grid-connected or networked energy storage system needs to be stacked with 10 energy storage batteries to meet the rated voltage output requirement of 480V.

[0003] In actual applications, it is found that when a single energy storage battery fails, the entire grid-connected energy storage system needs to stop working, replace the failed energy storage battery, and select batteries with the same status and performance specifications as other grid-connected energy storage batteries. After testing and verification, the system can be restarted to work. This not only involves tedious steps such as selection and testing, but also affects the work of the energy storage system. Summary of the invention

[0004] In view of the above-mentioned problem that when a single energy storage battery fails, there are cumbersome steps such as selection and testing, and the operation of the energy storage system is affected, the present invention provides a grid-connected energy storage battery. When the grid-connected energy storage battery fails, the entire energy storage system does not need to stop working, and there is no need to replace the grid-connected energy storage battery. The unloading and off-grid functions of the faulty grid-connected energy storage battery can be completed without affecting the operation of the entire energy storage system.

[0005] In order to solve the above technical problems, the specific solutions provided by the present invention are as follows:

[0006] A grid-connected energy storage battery, applied to an energy storage system, comprising a battery module, a DC-DC buck-boost power control module, a P+P- short circuit detection control module, an MCU control module and a communication module;

[0007] The battery module is connected to a DC-DC buck-boost power control module and a P+P-short circuit detection control module, the DC-DC buck-boost power control module and the P+P-short circuit detection control module are respectively connected to an MCU control module, the MCU control module is connected to a communication module, and the communication module is connected to an energy storage system;

[0008] The DC-DC buck-boost power control module is connected to the P+ terminal and the P- terminal of the energy storage system;

[0009] The P+P- short circuit detection control module is connected to the P+ terminal and the P- terminal of the energy storage system.

[0010] Optionally, the DC-DC buck-boost power control module includes a DC-DC buck-boost control circuit;

[0011] The DC-DC buck-boost control circuit comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor unit;

[0012] The first switch unit, the second switch unit, the third switch unit and the fourth switch unit are connected to the inductor unit respectively, the first switch unit is connected to the fourth switch unit, the second switch unit is connected to the third switch unit, and the signal of the battery module enters the DC-DC buck-boost control circuit. In the discharge state, it is boosted by the inductor unit. At this time, the second switch unit acts as a freewheeling tube and the third switch unit acts as a switch tube; in the charging state, the second switch unit acts as a switch tube and the third switch unit acts as a freewheeling tube. The grid-connected energy storage battery uses the DC-DC buck-boost control circuit to make the output voltage, output power and other status information consistent with other online grid-connected energy storage batteries.

[0013] Optionally, the DC-DC buck-boost power control module further includes a filtering unit;

[0014] The filter unit is connected to the DC-DC step-up and step-down control circuit, and interference is filtered out by the filter unit to improve the stability of signal transmission.

[0015] Optionally, the DC-DC buck-boost power control module further includes a current sampling circuit and an overcurrent protection circuit;

[0016] The current sampling circuit is connected to the DC-DC buck-boost control circuit and the overcurrent protection circuit. The current signal of the main loop is obtained through the current sampling circuit, and the overcurrent protection circuit achieves the purpose of current limiting output, thereby protecting the circuit.

[0017] Optionally, the overcurrent protection circuit includes a charging current detection unit and a discharging current detection unit, and the charging current and the discharging current are detected by the charging current detection unit and the discharging current detection unit respectively, and the MCU control module makes corresponding control.

[0018] Optionally, the charging current detection unit includes a first operational amplifier and a first comparator;

[0019] The first operational amplifier is connected to the current sampling circuit and the first comparator, and the first comparator is connected to the MCU control module; the sampled charging current is amplified by the first operational amplifier and enters the first comparator to detect the charging current. If the charging current exceeds the limit, a high level is output to the MCU control module to trigger wave-by-wave current limiting. The MCU control module closes the drive of the second switch unit and the third switch unit to achieve the purpose of hardware current limiting.

[0020] Optionally, the discharge current detection unit includes a second operational amplifier and a second comparator;

[0021] The second operational amplifier is connected to the current sampling circuit and the second comparator, and the second comparator is connected to the MCU control module; the sampled discharge current is amplified by the second operational amplifier and enters the second comparator to detect the discharge current. If the discharge current exceeds the limit, a high level is output to the MCU control module to trigger wave-by-wave current limiting. The MCU control module closes the drive of the second switch unit and the third switch unit to achieve the purpose of hardware current limiting.

[0022] Optionally, the DC-DC buck-boost power control module further includes a buck-boost detection circuit;

[0023] The buck-boost detection circuit is connected to the DC-DC buck-boost control circuit and the MCU control module. According to the detection result of the buck-boost detection circuit, the MCU control module adjusts the output of the DC-DC buck-boost control circuit so that the output voltage is stabilized at a set voltage value.

[0024] Optionally, the P+P- short circuit detection control module includes a fourth switch unit, a fifth switch unit, a sixth switch unit, a fuse unit, a voltage detection unit and a first resistor;

[0025] The fourth switch unit is connected to the MCU control module, the P+ terminal of the energy storage system and the first resistor, and the other end of the first resistor is connected to the P- terminal of the energy storage system;

[0026] The fifth switch unit is connected to the MCU control module, the insurance unit and the P-end of the energy storage system;

[0027] The sixth switch unit is connected to the P+ terminal and the P- terminal of the energy storage system;

[0028] The insurance unit is connected to the positive terminal of the battery module and the P+ terminal of the energy storage system;

[0029] The voltage detection unit is connected to the negative terminal of the battery module and the P-terminal of the energy storage system. When the short-circuit condition is met, the P+ and P-terminals of the energy storage system are short-circuited through the P+P- short-circuit detection control module, thereby connecting the faulty grid-connected energy storage battery to the energy storage system off-grid.

[0030] Optionally, the communication module adopts CAN communication mode or RS485 communication mode to make the system communication more stable and reliable.

[0031] Compared with the prior art, the beneficial effect of the present invention is that: when a grid-connected energy storage battery provided by the present invention fails, the entire energy storage system does not need to stop working, and there is no need to replace the grid-connected energy storage battery, and the unloading and off-grid functions of the faulty grid-connected energy storage battery can be completed without affecting the operation of the entire energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A topological structure diagram of a grid-connected energy storage battery provided in an embodiment of the present invention.

[0033] Figure 2 The figure is a connection diagram of a DC-DC step-up / step-down control circuit, a current sampling circuit and a filter unit provided in an embodiment of the present invention.

[0034] Figure 3 It is a connection diagram of the first switch unit provided in an embodiment of the present invention.

[0035] Figure 4 It is a connection diagram of the second switch unit provided in an embodiment of the present invention.

[0036] Figure 5 It is a connection diagram of the third switch unit provided in an embodiment of the present invention.

[0037] Figure 6 It is a connection diagram of the fourth switch unit provided in an embodiment of the present invention.

[0038] Figure 7 It is a connection diagram of the inductor unit provided in an embodiment of the present invention.

[0039] Figure 8 It is a connection diagram of the filter unit provided in the embodiment of the present invention.

[0040] Fig. 9 A connection diagram of a current sampling circuit provided in an embodiment of the present invention.

[0041] Fig.10 A connection diagram of an overcurrent protection circuit provided in an embodiment of the present invention.

[0042] Fig.11 It is a connection diagram of the buck-boost detection circuit provided in an embodiment of the present invention.

[0043] Fig.12 Schematic diagram of the connection of the P+P- short circuit detection control module provided in the embodiment of the present invention.

[0044] Fig.13 The figure is a schematic diagram of a CAN communication circuit provided in an embodiment of the present invention.

[0045] Fig.14 The figure is a schematic diagram of an RS485 communication circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to explain the technical solution of the present invention in detail, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] For example, a grid-connected energy storage battery is used in an energy storage system. The grid-connected energy storage battery includes a battery module, a DC-DC buck-boost power control module, a P+P- short circuit detection control module, an MCU control module and a communication module; the battery module is connected to the DC-DC buck-boost power control module and the P+P- short circuit detection control module, the DC-DC buck-boost power control module and the P+P- short circuit detection control module are respectively connected to the MCU control module, the MCU control module is connected to the communication module, and the communication module is connected to the energy storage system; the DC-DC buck-boost power control module is connected to the P+ end and the P- end of the energy storage system; the P+P- short circuit detection control module is connected to the P+ end and the P- end of the energy storage system.

[0049] The present embodiment provides a grid-connected energy storage battery. When a fault occurs in the grid-connected energy storage battery, the entire energy storage system does not need to stop working, and the grid-connected energy storage battery does not need to be replaced. The unloading and off-grid functions of the faulty grid-connected energy storage battery can be completed without affecting the operation of the entire energy storage system.

[0050] like Figure 1 As shown, a grid-connected energy storage battery is applied to an energy storage system. The grid-connected energy storage battery includes a battery module, a DC-DC buck-boost power control module, a P+P- short circuit detection control module, an MCU control module and a communication module.

[0051] Among them, the battery module is used to provide voltage for the energy storage system; the DC-DC buck-boost power control module is used to adjust the output voltage, output power and other status information to be consistent with other online grid-connected energy storage batteries; the P+P- short-circuit detection control module is used to detect the short-circuit state and connect the faulty grid-connected energy storage battery to the energy storage system off-grid; the MCU control module is used to obtain signals from the DC-DC buck-boost power control module and the P+P- short-circuit detection control module, and control them to make corresponding adjustments or further actions, and to transmit signals with the communication module; the communication module is used to communicate with the energy storage system.

[0052] Specifically, the battery module is connected to the DC-DC buck-boost power control module and the P+P- short circuit detection control module, the DC-DC buck-boost power control module and the P+P- short circuit detection control module are respectively connected to the MCU control module, the MCU control module is connected to the communication module, and the communication module is connected to the energy storage system; the DC-DC buck-boost power control module is connected to the P+ end and P- end of the energy storage system; the P+P- short circuit detection control module is connected to the P+ end and P- end of the energy storage system.

[0053] In practical applications, the grid-connected energy storage battery is connected to the energy storage system, and the voltage, power and other status information of the online grid-connected energy storage battery in the energy storage system and the voltage, power and other status information required to be output are obtained through the communication module. According to the output requirements such as the output voltage and power required, the DC-DC buck-boost power control module adjusts the grid-connected energy storage battery to adjust its output voltage, output power and other status information to be consistent with other online grid-connected energy storage batteries.

[0054] When a grid-connected energy storage battery fails, it is detected by the P+P- short-circuit detection control module. When the short-circuit condition is met, the P+P- short-circuit detection control module short-circuits the P+ and P- ends of the energy storage system, thereby connecting the faulty grid-connected energy storage battery to the energy storage system off-grid.

[0055] In some embodiments, Figure 2-Figure 7 As shown, the DC-DC buck-boost power control module includes a DC-DC buck-boost control circuit; the DC-DC buck-boost control circuit includes a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor unit.

[0056] Among them, the first switch unit, the second switch unit, the third switch unit and the fourth switch unit are respectively connected to the inductor unit, the first switch unit is connected to the fourth switch unit, and the second switch unit is connected to the third switch unit. The signal of the battery module enters the DC-DC buck-boost control circuit. In the discharge state, it is boosted through the inductor unit. At this time, the second switch unit acts as a freewheeling tube and the third switch unit acts as a switch tube; in the charging state, the second switch unit acts as a switch tube and the third switch unit acts as a freewheeling tube. The grid-connected energy storage battery uses the DC-DC buck-boost control circuit to make the output voltage, output power and other status information consistent with other online grid-connected energy storage batteries.

[0057] Specifically, refer to Figure 3-Figure 6 The first switch unit includes MOS tubes Q1, Q15, Q13 and Q14; the second switch unit includes MOS tubes Q2, Q5, Q6 and Q10; the third switch unit includes MOS tubes Q4, Q11, Q8, Q12, and the fourth switch unit includes Q3, Q16, Q18 and Q17.

[0058] The BAT_IN+ signal enters the DC-DC buck-boost control circuit. In the discharge state, if the battery voltage is lower than the output voltage, it is a boost circuit. After the inductor unit boosts the voltage, MOS tubes Q2, Q5, Q6 and Q10 are used as freewheeling tubes, and MOS tubes Q4, Q11, Q8, and Q12 are used as switch tubes to output the signal from BUS+. If the battery voltage is higher than the output voltage, it is a buck circuit. MOS tubes Q1, Q15, Q13, and Q14 are used as switch tubes, and MOS tubes Q3, Q16, Q18, and Q17 are used as synchronous rectifier freewheeling tubes to perform buck discharge output.

[0059] In the charging state, on the contrary, if the charger voltage is higher than the battery voltage, it is a step-down circuit, MOS tubes Q2, Q5, Q6 and Q10 are used as switch tubes, and MOS tubes Q4, Q11, Q8, Q12 are used as freewheeling tubes. If the charger voltage is lower than the battery voltage, it works in the boost state, at which time MOS tubes Q3, Q16, Q18, Q17 are used as switch tubes, and MOS tubes Q1, Q15, Q13, Q14 are used as freewheeling tubes for boost output. The DC-DC step-up and step-down control circuit adopts a staggered parallel half-bridge circuit mode to reduce the impact of ripple on the output.

[0060] It should be noted that, in the first switch unit, the second switch unit and the third switch unit, not only MOS tubes are used, and any controllable switch can be applied to the DC-DC buck-boost control circuit.

[0061] In some embodiments, Figure 2 and Figure 8As shown, the DC-DC buck-boost power control module also includes a filter unit; the filter unit is connected to the DC-DC buck-boost control circuit, and interference is filtered out by the filter unit to improve the stability of signal transmission.

[0062] Reference Figure 8 The filter unit includes a capacitor C53 and a capacitor C62 connected in series. The BAT_IN+ signal enters the DC-DC buck-boost control circuit after being filtered by the filter unit, which is beneficial to improving the stability of signal transmission.

[0063] In some embodiments, Fig. 9 and Fig.10 As shown, the DC-DC buck-boost power control module also includes a current sampling circuit and an overcurrent protection circuit; the current sampling circuit is connected to the DC-DC buck-boost control circuit and the overcurrent protection circuit, the current signal of the main circuit is obtained through the current sampling circuit, and the overcurrent protection circuit realizes the purpose of current limiting output, thereby protecting the circuit.

[0064] Among them, the overcurrent protection circuit includes a charging current detection unit and a discharging current detection unit, which detect the charging current and the discharging current respectively, and the MCU control module makes corresponding control.

[0065] Reference Fig. 9 The current sampling circuit includes resistors R58, R59, R61, R62, R64 and R67 connected in parallel. Current sampling is performed through the current sampling circuit. The sampled current signal passes through the charging current detection unit or the discharging current detection unit to detect the charging or discharging current.

[0066] Reference Fig.10 The charging current detection unit includes a first operational amplifier and a first comparator; wherein the first operational amplifier is U12A, the first comparator is U13A, the first operational amplifier U12A is connected to the current sampling circuit and the first comparator U13A, and the first comparator U13A is connected to the MCU control module.

[0067] The sampled charging current is amplified by the first operational amplifier U12A and enters the first comparator U13A to detect the charging current. If the charging current exceeds the limit, a high level is output to the TZ port of the MCU control module to trigger wave-by-wave current limiting. The MCU control module closes the drive of the second switch unit and the third switch unit to achieve the purpose of hardware current limiting.

[0068] The discharge current detection unit includes a second operational amplifier and a second comparator; wherein the second operational amplifier is U12B, the second comparator is U13B, the second operational amplifier U12B is connected to the current sampling circuit and the second comparator U13B, and the second comparator U13B is connected to the MCU control module.

[0069] The sampled discharge current is amplified by the second operational amplifier U12B and enters the second comparator U13B to detect the discharge current. If the discharge current exceeds the limit, a high level is output to the TZ port of the MCU control module to trigger wave-by-wave current limiting. The MCU control module closes the drive of the second switch unit and the third switch unit to achieve the purpose of hardware current limiting.

[0070] It should be noted that this example can set up hardware-level and software-level overcurrent protection functions. When the MCU closes the drive of the second and third switch units to achieve the purpose of hardware current limiting, the software performs average current filtering and limits the charge and discharge current through the software current loop to achieve the purpose of constant current charging and discharging. The hardware current limiting speed is fast and is used as a fast overcurrent fault protection. The software current limiting speed is slightly slower, but more accurate, and can achieve the purpose of current limiting output. By combining the software and hardware current limiting functions, a more complete protection for the circuit can be achieved.

[0071] In some embodiments, Fig.11 As shown, the DC-DC buck-boost power control module also includes a buck-boost detection circuit; the buck-boost detection circuit is connected to the DC-DC buck-boost control circuit and the MCU control module. Through the detection result of the buck-boost detection circuit, the MCU control module adjusts the output of the DC-DC buck-boost control circuit to stabilize the output voltage at a set voltage value.

[0072] Reference Fig.11 When the BUS+ voltage is higher than the voltage set by REF_MCU, V_BUS_LOOP outputs a low level; when the BUS+ voltage is lower than the voltage set by REF_MCU, V_BUS_LOOP outputs a high level.

[0073] By obtaining the state of V_BUS_LOOP, the output of the DC-DC buck-boost control circuit is adjusted so that the voltage of BUS+ is maintained at the set voltage. In this example, the current is controlled in the same way.

[0074] In some embodiments, Fig.12 As shown, the P+P- short circuit detection control module includes a fourth switch unit, a fifth switch unit, a sixth switch unit, a fuse unit, a voltage detection unit and a first resistor.

[0075] Among them, the fourth switch unit is connected to the MCU control module, the P+ end of the energy storage system and the first resistor, and the other end of the first resistor is connected to the P- end of the energy storage system; the fifth switch unit is connected to the MCU control module, the insurance unit and the P- end of the energy storage system; the sixth switch unit is connected to the P+ end and the P- end of the energy storage system; the insurance unit is connected to the positive end of the battery module and the P+ end of the energy storage system; the voltage detection unit is connected to the negative end of the battery module and the P- end of the energy storage system; when the short-circuit condition is met, the P+ end and the P- end of the energy storage system are short-circuited through the P+P- short-circuit detection control module, so that the faulty grid-connected energy storage battery is connected to the energy storage system off-grid.

[0076] Specifically, the fourth switch unit includes a MOS tube Q7, the fifth switch unit includes a MOS tube Q9, the sixth switch unit includes a relay RLY1, the insurance unit includes a fuse F1, the voltage detection unit includes a resistor R6, and the first resistor is R1.

[0077] When the system operating current meets the grid-connected conditions, Q7_DRV is controlled to turn on the MOS tube Q7, and the first resistor R1 is connected to the P+ and P- ends of the energy storage system. The voltage across the resistor R6 is detected to detect whether the battery module current is normal. When the short-circuit condition is met, that is, the entire energy storage system is in a low-current discharge or idle state and does not output power to the outside, Short_DRV is controlled to turn on the MOS tube Q9 to blow the fuse F1, so that the BAT+ of the battery module is disconnected from the P+ of the energy storage system, and RLY_DRV+ and RLY_DRV- are controlled to connect the contactor points 3 and 4 of the relay RLY1, so that the P+ and P- ends of the energy storage system are short-circuited, and the grid-connected energy storage battery is off-grid.

[0078] In some embodiments, the communication module adopts CAN communication mode or RS485 communication mode, such as Fig.13 and Fig.14 As shown, Fig.13 The CAN communication circuit is shown. Fig.14 Shown is the RS485 communication circuit.

[0079] Reference Fig.13 The network labels CANTX and CANRX correspond to the peripheral CAN of the MCU control module respectively. The peripheral CAN of the MCU control module is connected to the transceiver IC in the CAN communication circuit through the isolation device output, and the isolated CAN signal is converted into a standard CAN bus physical layer interface.

[0080] Among them, a TVS or ESD device can be connected to the output interface of the CAN communication circuit to prevent external static high voltage from damaging internal devices.

[0081] Reference Fig.14, network labels TXD_485 and RXD_485 are connected to the TX and RX pins of the corresponding peripheral UART or USART of the MCU control module, and network label 485_DE is connected to the GPIO pin of the MCU control module. Among them, TXD_485, RXD_485 and 485_DE are connected to the RS485 transceiver through optocoupler isolation, and the UART or USART signal of the serial port TTL level output by the MCU control module is converted into a differential signal that meets the RS485 bus standard after isolation.

[0082] Among them, a TVS or ESD device can be connected at the interface output of the RS485 communication circuit to prevent external static high voltage from damaging internal devices.

[0083] In the entire grid-connected energy storage battery, all information interactions are completed through the communication module, which contains the following information: first, the status information of the online grid-connected energy storage battery, such as battery voltage, temperature, current, SOC, SOH alarm fault and other status information; second, the output information of the online grid-connected energy storage battery, such as the adjustable voltage range and accuracy of the battery, the output current range and accuracy, whether the voltage can be increased or decreased, etc.; third, the battery pack voltage range and accuracy, current range and accuracy, actual system output information, system output information and system status information required by the master control, etc. The actual output information of the system includes the total output voltage, real-time current, number of online battery packs, real-time information of battery packs, system insulation value, ambient temperature, pre-charging resistor temperature, contactor status, and system alarm protection status; the output information of the system includes control information such as output power, output voltage, output current range, number of batteries that can be boosted or reduced, and number of batteries allowed to be boosted or reduced by the system; the system status information includes total SOC, total SOH, alarm, protection status, number of online battery packs, number of battery packs in boost or reduce execution, and number of remaining battery packs allowed to be boosted or reduced.

[0084] The present invention provides a grid-connected energy storage battery. When a fault occurs in the grid-connected energy storage battery, the entire energy storage system does not need to stop working, and the grid-connected energy storage battery does not need to be replaced. The unloading and off-grid functions of the faulty grid-connected energy storage battery can be completed without affecting the operation of the entire energy storage system.

[0085] It can be understood that different implementations of the various components in the above embodiments can be implemented in combination, and the embodiments are only intended to illustrate the implementation methods of specific structures and are not intended to be a limitation on the implementation of the solutions.

[0086] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A grid-connected energy storage battery, characterized in that: Applied in an energy storage system, the grid-connected energy storage battery includes a battery module, a DC-DC buck-boost power control module, a P+P- short circuit detection control module, an MCU control module and a communication module; The battery module is connected to a DC-DC buck-boost power control module and a P+P-short circuit detection control module, the DC-DC buck-boost power control module and the P+P-short circuit detection control module are respectively connected to an MCU control module, the MCU control module is connected to a communication module, and the communication module is connected to an energy storage system; The DC-DC buck-boost power control module is connected to the P+ terminal and the P- terminal of the energy storage system; The P+P- short circuit detection control module is connected to the P+ terminal and the P- terminal of the energy storage system; The P+P- short circuit detection control module includes a fourth switch unit, a fifth switch unit, a sixth switch unit, a fuse unit, a voltage detection unit and a first resistor; The fourth switch unit is connected to the MCU control module, the P+ terminal of the energy storage system and the first resistor, and the other end of the first resistor is connected to the P- terminal of the energy storage system; The fifth switch unit is connected to the MCU control module, the insurance unit and the P-end of the energy storage system; The sixth switch unit is connected to the P+ terminal and the P- terminal of the energy storage system; The insurance unit is connected to the positive terminal of the battery module and the P+ terminal of the energy storage system; The voltage detection unit is connected to the negative terminal of the battery module and the P-terminal of the energy storage system.

2. The grid-connected energy storage battery according to claim 1, characterized in that: The DC-DC buck-boost power control module includes a DC-DC buck-boost control circuit; The DC-DC buck-boost control circuit comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor unit; The first switch unit, the second switch unit, the third switch unit and the fourth switch unit are respectively connected to the inductor unit, the first switch unit is connected to the fourth switch unit, and the second switch unit is connected to the third switch unit.

3. The grid-connected energy storage battery according to claim 2, characterized in that: The DC-DC buck-boost power control module also includes a filtering unit; The filter unit is connected to a DC-DC step-up and step-down control circuit.

4. The grid-connected energy storage battery according to claim 2, characterized in that: The DC-DC buck-boost power control module also includes a current sampling circuit and an overcurrent protection circuit; The current sampling circuit is connected to the DC-DC step-up and step-down control circuit and the overcurrent protection circuit.

5. The grid-connected energy storage battery according to claim 4, characterized in that: The overcurrent protection circuit includes a charging current detection unit and a discharging current detection unit.

6. The grid-connected energy storage battery according to claim 5, characterized in that: The charging current detection unit includes a first operational amplifier and a first comparator; The first operational amplifier is connected to the current sampling circuit and the first comparator, and the first comparator is connected to the MCU control module.

7. The grid-connected energy storage battery according to claim 5, characterized in that: The discharge current detection unit includes a second operational amplifier and a second comparator; The second operational amplifier is connected to the current sampling circuit and the second comparator, and the second comparator is connected to the MCU control module.

8. The grid-connected energy storage battery according to claim 2, characterized in that: The DC-DC buck-boost power control module also includes a buck-boost detection circuit; The buck-boost detection circuit is connected to the DC-DC buck-boost control circuit and the MCU control module.

9. The grid-connected energy storage battery according to claim 1, characterized in that: The communication module adopts CAN communication mode or RS485 communication mode.

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