Portable energy storage system and control method

Abstract

The invention relates to the technical field of energy storage power supplies, and particularly discloses a portable energy storage system and method.The system comprises a battery pack and a power integration system which are electrically connected, and the power integration system comprises an analog front end sampling chip, a first bidirectional DCDC converter, a bidirectional inverter, a low-voltage MCU, a driving circuit and a sampling circuit; the low-voltage MCU is used for communicating with the analog front-end sampling chip and reading data of the battery pack; the data acquisition circuit is also used for acquiring working data of the first bidirectional DCDC converter from the sampling circuit; the control module is also used for generating a control instruction of charging or discharging the battery pack by the first bidirectional DCDC converter according to the battery pack data and the working data of the first bidirectional DCDC converter; and the driving circuit is used for executing a control instruction of the low-voltage MCU on the first bidirectional DCDC converter. According to the technical scheme, the overall performance and economical efficiency of the system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power supply, and in particular to a portable energy storage system and a control method. Background Art

[0002] Portable power banks are widely used in a variety of scenarios due to their portability and versatility, such as camping, hiking, emergency backup power, mobile work, entertainment activities, outdoor sports, photography and videography, and medical emergency. Portable power bank systems are usually composed of power components such as battery management systems (BMS), battery packs, bidirectional power converters, photovoltaic charging circuits, and low-voltage DC outputs.

[0003] Since these components are usually produced by different manufacturers, the portable power bank has a complex internal structure, redundant components, and numerous connecting harnesses, which increases the difficulty and cost of control.

[0004] In view of the deficiencies of the prior art solutions, the present invention aims to provide a portable energy storage system and a control method to improve the overall performance and economy of the system. Summary of the invention

[0005] One of the purposes of the present invention is to provide a portable energy storage system that can improve the overall performance and economy of the system.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] A portable energy storage system includes an electrically connected battery pack and a power integration system, the power integration system including: an analog front-end sampling chip, a first bidirectional DCDC converter, a bidirectional inverter, a low-voltage MCU, a driving circuit and a sampling circuit;

[0008] The low voltage MCU is used to communicate with the analog front-end sampling chip to read the battery pack data; it is also used to obtain the working data of the first bidirectional DCDC converter from the sampling circuit; it is also used to generate a control instruction for the first bidirectional DCDC converter to charge or discharge the battery pack according to the battery pack data and the working data of the first bidirectional DCDC converter;

[0009] The driving circuit is used to execute the control instruction of the low-voltage MCU to the first bidirectional DCDC converter.

[0010] Furthermore, the power integration system further comprises: a high voltage MCU, a current sensing resistor, an isolation communication circuit and a soft start circuit;

[0011] The first bidirectional DCDC converter is electrically connected to the positive electrode and the negative electrode of the battery pack through the low voltage DC bus bars P+ and P-, respectively;

[0012] The first bidirectional DCDC converter is electrically connected to the bidirectional inverter via high-voltage DC bus Bus+ and Bus-;

[0013] The bidirectional inverter is electrically connected to the AC input terminal ACin and the AC output terminal ACout respectively;

[0014] The current sensing resistor is electrically connected between the analog front-end sampling chip and the low-voltage DC bus P-;

[0015] The low voltage MCU is connected to the high voltage MCU through an isolated communication circuit;

[0016] The soft start circuit is electrically connected to the low voltage DC bus bars P+ and P- respectively;

[0017] The high-voltage MCU is used to obtain the AC input voltage and the high-voltage DC bus voltage from the sampling circuit; and generate control instructions for the bidirectional inverter to work in the charging state according to the AC input voltage;

[0018] The low-voltage MCU is used to generate a control instruction for the first bidirectional DCDC converter to discharge the battery pack during discharge, and to increase the high-voltage DC bus voltage to the rated voltage; the high-voltage MCU is also used to determine that after the high-voltage DC bus voltage has increased to the rated voltage, generate a control instruction for the bidirectional inverter to operate in a discharge state;

[0019] The drive circuit is also used to execute control instructions of the high-voltage MCU to the bidirectional inverter.

[0020] Furthermore, the power integration system also includes a second DCDC converter; the second DCDC converter is electrically connected to the soft start circuit, the low voltage DC bus P+, P-, and the high voltage DC bus Bus+, Bus- respectively.

[0021] Furthermore, the power integration system further includes a third DCDC converter and a fourth DCDC converter; the third DCDC converter is electrically connected to the PV+ terminal and the PV- terminal respectively; the third DCDC converter is also electrically connected to the low-voltage DC bus P+ and the soft-start circuit;

[0022] The fourth DCDC converter is electrically connected to the third DCDC converter, the low voltage DC bus P+ and the soft start circuit respectively; the fourth DCDC converter is also electrically connected to the DCout terminal.

[0023] Furthermore, the detection battery pack data of the analog front-end sampling chip includes the voltage of each single cell and the battery pack current;

[0024] The low voltage MCU is used to calculate the battery pack voltage based on the single cell voltage.

[0025] Further, the low voltage MCU is also used to obtain the working data of the second DCDC converter, the third DCDC converter, and the fourth DCDC converter from the sampling circuit, and the working data includes the working voltage, the working current, and the working temperature;

[0026] It is also used to generate a discharge control instruction for the second DCDC converter to the battery pack, a charge control instruction for the third DCDC converter to the battery pack, and a discharge control instruction for the fourth DCDC converter to the battery pack;

[0027] The driving circuit is also used to execute control instructions of the low-voltage MCU on the second DCDC converter, the third DCDC converter, and the fourth DCDC converter.

[0028] Furthermore, the second DCDC converter is used to start working and discharge the battery pack when the load power is lower than the preset power for a preset time;

[0029] The third DCDC converter is used to charge the battery pack when external DC power is connected;

[0030] The fourth DCDC converter is used to convert the battery pack voltage into a low-voltage DC preset output voltage for external output.

[0031] Furthermore, the soft start circuit includes: a low voltage DC bus capacitor C1, a pre-charge resistor R1, a pre-charge MOS tube Q1, a grounding MOS tube Q2, and a discharge resistor R2;

[0032] One end of the low-voltage DC bus capacitor C1 is connected to the low-voltage DC bus P+, and the other end of the low-voltage DC bus capacitor C1 is connected to one end of the pre-charging resistor R1;

[0033] The other end of the pre-charging resistor R1 is connected to one end of the pre-charging MOS tube Q1, and the other end of the pre-charging MOS tube Q1 is connected to the low-voltage DC bus P-;

[0034] One end of the discharge resistor R2 is connected to the low voltage DC bus P+, and the other end of the discharge resistor R2 is connected to one end of R1;

[0035] One end of the grounded MOS tube Q2 is respectively connected to the other end of R2, the third DCDC converter and the fourth DCDC converter; the other end of the grounded MOS tube Q2 is connected to the low-voltage DC bus P-;

[0036] The soft start circuit is used to pre-charge the low voltage DC bus capacitor C1.

[0037] A second object of the present invention is to provide a portable energy storage system control method, which is applied to the above-mentioned system and includes the following contents:

[0038] It includes the following:

[0039] Read the battery pack data through the analog front-end sampling chip and obtain the working data of the first bidirectional DCDC converter through the sampling circuit;

[0040] The first bidirectional DCDC converter is controlled to operate in a charging or discharging state according to the battery pack data and the operating data.

[0041] Furthermore, the operating data of the second DCDC converter, the third DCDC converter, and the fourth DCDC converter are obtained through the sampling circuit;

[0042] Controlling the second DCDC converter, the third DCDC converter, and the fourth DCDC converter to operate in a charging or discharging state according to the operating data;

[0043] Communicate with the high-voltage MCU through an isolated communication circuit;

[0044] The high-voltage MCU obtains the AC input voltage and the high-voltage DC bus voltage from the sampling circuit; according to the AC input voltage, the bidirectional inverter is operated in a charging state; according to the high-voltage DC bus voltage, the bidirectional inverter is controlled to work in coordination with the first bidirectional DCDC converter and / or the second DCDC converter, so that the bidirectional inverter works in a discharging state.

[0045] This solution integrates the power system of the entire portable mobile power supply. Considering that the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter are all independently controlled to start and stop, the start and stop of each component are used to realize the charging MOS and discharging MOS functions of the BMS, thereby reducing the cost of the BMS components (in a system with a BMS, when the battery is over-voltage, charging over-temperature, or charging low temperature, the BMS will control the charging MOS to disconnect and stop charging the battery; when the battery is under-voltage, discharging over-temperature, or discharging low temperature, the BMS will control the discharging MOS to disconnect and stop discharging the battery); and because the power system is integrated together, the BMS, the photovoltaic charging circuit, the low-voltage DC circuit, and the first bidirectional DCDC converter can be controlled by a low-voltage MCU control chip, saving the communication between the components and the cost of the MCU; in addition, the various power components of the existing solution are connected by power cables, and because the power system is integrated together, the wiring harness cost can also be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A circuit diagram of a portable energy storage system embodiment that only includes the main components of a first bidirectional DCDC converter and a bidirectional inverter;

[0047] Figure 2 A circuit diagram of a portable energy storage system embodiment including an optional component, a second DCDC converter;

[0048] Figure 3 A circuit diagram of a portable energy storage system embodiment including optional components, a third DCDC converter and a fourth DCDC converter;

[0049] Figure 4 The present invention is a circuit diagram of a portable energy storage system embodiment including all optional components. DETAILED DESCRIPTION

[0050] The following is further described in detail through specific implementation methods:

[0051] Example

[0052] A portable energy storage system of this embodiment includes a battery pack and a power integration system that are electrically connected;

[0053] The battery pack is composed of single cells connected in series, in parallel or in series and in parallel.

[0054] like Figure 1 As shown, the power integration system includes an analog front-end sampling chip, a current sensing resistor, a first bidirectional DCDC converter (i.e., the bidirectional DCDC converter in the figure), a bidirectional inverter, a soft start circuit, a low-voltage MCU, a high-voltage MCU, a drive circuit, a sampling circuit, and an isolated communication circuit;

[0055] The analog front-end sampling chip is electrically connected to the battery pack;

[0056] The first bidirectional DCDC converter is electrically connected to the positive electrode and the negative electrode of the battery pack through the low voltage DC bus bars P+ and P-, respectively;

[0057] The first bidirectional DCDC converter is electrically connected to the bidirectional inverter via high-voltage DC bus Bus+ and Bus-;

[0058] The bidirectional inverter is electrically connected to the AC input terminal ACin and the AC output terminal ACout respectively;

[0059] The current sensing resistor is electrically connected between the analog front-end sampling chip and the low-voltage DC bus P-;

[0060] The low voltage MCU communicates with the analog front-end sampling chip;

[0061] The low-voltage MCU and the high-voltage MCU are connected via an isolated communication circuit;

[0062] The soft start circuit is electrically connected to the low voltage DC bus bars P+ and P- respectively;

[0063] like Figure 2As shown, in order to improve the efficiency at low power output, a second DCDC converter is also included; the second DCDC converter is electrically connected to the soft start circuit, the low voltage DC bus P+, P-, and the high voltage DC bus Bus+, Bus- respectively;

[0064] like Figure 3 As shown, in order to realize DC charging, a third DCDC converter is also included; the third DCDC converter is electrically connected to the PV+ terminal and the PV- terminal respectively; the third DCDC converter is also electrically connected to the low-voltage DC bus P+ and the soft-start circuit;

[0065] In order to achieve low-voltage DC output, a fourth DCDC converter is also included; the fourth DCDC converter is electrically connected to the third DCDC converter, the low-voltage DC bus P+ and the soft-start circuit respectively; the fourth DCDC converter is also electrically connected to the DCout terminal;

[0066] In order to prevent the battery current from being too large, a fuse F1 is also included; the fuse F1 is electrically connected between the positive electrode of the battery pack and the low-voltage DC bus P+.

[0067] The main feature of the first bidirectional DCDC converter is bidirectional conversion, which can discharge or charge the battery, and belongs to a bidirectional DCDC converter; the second DCDC converter in this solution is mainly used for AC low-power discharge, and belongs to a unidirectional boost type DCDC converter; the third DCDC converter is used for photovoltaic or DC power supply to charge the battery pack, and belongs to a unidirectional boost type DCDC converter; the fourth DCDC converter converts the battery pack voltage into a low voltage 12V, 5V output, for example, and belongs to a unidirectional buck type DCDC converter. Since the second DCDC converter, the third DCDC converter, and the fourth DCDC converter are optional components, in the pursuit of a lower cost solution, the corresponding components and their corresponding sampling circuits and drive circuits can be discarded to further reduce system costs.

[0068] like Figure 4 As shown, this embodiment is specifically described by including a second DCDC converter, a third DCDC converter, and a fourth DCDC converter.

[0069] The sampling circuit is electrically connected to the low voltage MCU and the high voltage MCU respectively;

[0070] The driving circuit is electrically connected to the low voltage MCU and the high voltage MCU respectively;

[0071] The soft start circuit specifically includes a low voltage DC bus capacitor C1, a pre-charge resistor R1, a pre-charge MOS tube Q1, a grounding MOS tube Q2, and a discharge resistor R2;

[0072] One end of the low-voltage DC bus capacitor C1 is connected to the low-voltage DC bus P+, and the other end of the low-voltage DC bus capacitor C1 is connected to one end of the pre-charging resistor R1;

[0073] The other end of the pre-charging resistor R1 is connected to one end of the pre-charging MOS tube Q1, and the other end of the pre-charging MOS tube Q1 is connected to the low-voltage DC bus P-;

[0074] One end of the discharge resistor R2 is connected to the low voltage DC bus P+, and the other end of the discharge resistor R2 is connected to one end of R1;

[0075] One end of the grounded MOS tube Q2 is respectively connected to the other end of R2, the third DCDC converter and the fourth DCDC converter; the other end of the grounded MOS tube Q2 is connected to the low-voltage DC bus P-;

[0076] The soft start circuit is used to pre-charge its low voltage DC bus capacitor C1.

[0077] The pre-charging resistor R1 and the discharge resistor R2 are one of cement resistors, metal film resistors, thick film resistors, and wire-wound resistors.

[0078] The analog front-end sampling chip is used to detect battery pack data, which includes information such as the voltage of each single cell in the battery pack, the battery pack current, and the battery pack temperature, and sends the information such as the voltage of each single cell, the battery pack current, and the battery pack temperature to the low-voltage MCU through a communication connection; the communication methods include IIC communication, CAN communication, TWI communication, SPI communication, etc.;

[0079] The current-sense resistor is used to detect the current flowing through the battery pack;

[0080] Fuse F1 is used to melt after a short circuit occurs in the battery pack to disconnect the current loop;

[0081] The low-voltage MCU is used to communicate with the analog front-end sampling chip to read the voltage, current, temperature and other information of each single cell, and calculate the battery pack voltage based on the single cell voltage;

[0082] The sampling circuit is used for the low-voltage MCU to sample the working data of the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter, where the working data includes working voltage, working current, and working temperature, so as to control the corresponding charging or discharging state;

[0083] The isolated communication circuit is used for the high-voltage MCU to communicate with the low-voltage MCU, so as to ensure that the bidirectional inverter, the first bidirectional DCDC converter and the second DCDC converter can work in coordination;

[0084] The low voltage MCU is also used to control the first bidirectional DCDC converter to charge or discharge the battery pack; control the second DCDC converter to discharge the battery pack; control the third DCDC converter to charge the battery pack; and control the fourth DCDC converter to discharge the battery pack. The low voltage MCU controls the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter through the drive circuit;

[0085] The high-voltage MCU is used to control the bidirectional inverter to operate in a charging state or a discharging state.

[0086] Specifically, the low-voltage MCU obtains the low-voltage DC bus voltage V from the sampling circuit. P+ , bidirectional DCD converter current I dcdc1 , the second DCDC converter current I dcdc2 , the third DCDC converter input voltage V PVin 、Current I PVin , the fourth DCDC converter output voltage V DCout , current I DCout ;

[0087] The high-voltage MCU obtains the AC input voltage V from the sampling circuit ACin 、Current I ACin , AC output voltage V ACout 、Current I ACout , high voltage DC bus voltage V Bus ;

[0088] The low voltage MCU is electrically connected to the drive circuit and the drive signal Drv dcdc2 Control the second DCDC converter, control the first bidirectional DCDC converter through the drive signal Drvdcdc1, control the fourth DCDC converter through the drive signal Drv_buck, and control the third DCDC converter through the drive signal Drv_pv;

[0089] When the high voltage MCU detects V ACin When the voltage meets the preset conditions, it is considered that a charger is connected, and the bidirectional inverter is controlled to charge;

[0090] When discharge is required, the low-voltage MCU starts the first bidirectional DCDC converter to increase the voltage of the high-voltage DC bus Bus+ and Bus- to the rated voltage. The high-voltage MCU detects V BUS Voltage, V BUS When the voltage rises to meet the conditions (i.e., rises to the rated voltage), the bidirectional inverter is started to discharge. Specifically, the high-voltage MCU is connected to the drive circuit, and the drive signal Drv INV Controls bidirectional inverters.

[0091] The first bidirectional DCDC converter is used to increase the battery pack voltage to the voltage required for inversion during discharge. For example, when the national standard 220V AC output is used, the high-voltage DC bus Bus+ and Bus- voltages need to be increased to above the rated voltage (for example, 380V); it is also used to reduce the high-voltage DC bus voltage to the battery pack voltage during charging;

[0092] The bidirectional inverter is used to convert the DC voltage into a preset AC voltage output (such as national standard 220V, European standard 230V, American standard 120V) during discharge; it is also used to convert AC into DC voltage during charging;

[0093] The second DCDC converter is used to work when the AC output is low power, improving the output efficiency; conventional mobile power supplies may need to design two or more DCDC step-down circuits according to different functional requirements, for example, one for 12V output and one for 5V output, but two DCDC boost circuits will not be designed for the boost function. In this solution, an additional second DCDC converter is designed. When the output power is small, the low-power second DCDC converter is selected to work, which will greatly improve the working efficiency, extend the working time, and save electricity bills.

[0094] The third DCDC converter is used to charge the battery pack when external DC power is connected (for example, DC power generated by a photovoltaic panel or connected to a DC power supply);

[0095] The fourth DCDC converter is used to convert the battery pack voltage into a low voltage DC preset output voltage (eg 5V, 12V) for external output.

[0096] In this solution, the first bidirectional DCDC converter, the bidirectional inverter, and the second DCDC converter constitute the AC charging and discharging part; the third DCDC converter is the DC charging part; the fourth DCDC converter is the DC output part; the above three parts have independent functions and can be in working state at the same time or operate independently.

[0097] Based on the above system, this embodiment also provides a portable energy storage system control method, including the following contents:

[0098] The working data of the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter are sampled through a sampling circuit, and sent to the low-voltage MCU;

[0099] The low voltage MCU controls the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter to operate in a charging or discharging state according to the working data;

[0100] The low voltage MCU communicates with the high voltage MCU through the isolated communication circuit, and the high voltage MCU controls the bidirectional inverter to work in coordination with the first bidirectional DCDC converter or the second DCDC converter, so that the bidirectional inverter works in a charging state or a discharging state.

[0101] Specifically, the charging or discharging operation of the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, the fourth DCDC converter, and the bidirectional inverter includes the following steps:

[0102] When the battery pack needs AC discharge:

[0103] Precharge the low-voltage DC bus P+ and P- through the soft-start circuit;

[0104] The first bidirectional DCDC converter increases the voltage of the high-voltage DC bus Bus+ and Bus- to the rated voltage;

[0105] Start the bidirectional inverter to achieve ACout output;

[0106] When it is detected that the load power is at low power for a preset time (lower than the preset power is considered low power, for example, for a 1000Wh portable energy storage power supply, power below 200W can be considered low power), the second DCDC converter is started and the first bidirectional DCDC converter is turned off, thereby improving the efficiency of the system and extending the battery life.

[0107] When the load power is greater than the preset power, the first bidirectional DCDC converter is started, and the second DCDC converter is selected to stop running according to a preset rule;

[0108] In this embodiment, the preset rules include operating alone or selecting according to load power conditions;

[0109] If it is operated alone, the second DCDC converter stops running, that is, the second DCDC converter and the bidirectional DCDC converter do not work at the same time, and at a certain moment, only one converter works.

[0110] If the selection is based on the load power, it is determined whether the load power is greater than the maximum output power of the first bidirectional DCDC converter. If it is greater, the second DCDC converter is selected to continue to operate. If the load power is less than the maximum output power of the first bidirectional DCDC converter and greater than the preset power, the second DCDC converter stops operating. For example: the portable power supply is rated for 1200W output, of which the maximum output power of the first bidirectional DCDC converter is 1000W, and the maximum output of the second DCDC converter is 200W. When the actual load power is ≥1000W, the second DCDC converter is started to work simultaneously with the first bidirectional DCDC converter, and the maximum output can be 1200W; when the load power is less than 900W and greater than 200W, the second DCDC converter is turned off. This method can meet the user's load usage needs as much as possible.

[0111] When the battery pack requires DC discharge:

[0112] Precharge the low-voltage DC bus P+ and P- through the soft-start circuit;

[0113] By controlling the fourth DCDC converter to work, a 12V low voltage DC output can be achieved;

[0114] When AC is needed to charge the battery pack:

[0115] Plug ACin into AC power and start the bidirectional inverter;

[0116] When the voltage of the high-voltage DC bus Bus+ and Bus- reaches the rated value, the low-voltage MCU controls the soft-start circuit to pre-charge the low-voltage DC bus P+ and P-;

[0117] The first bidirectional DCDC converter is started to realize charging;

[0118] When a car charger or PV is needed to charge the battery pack:

[0119] When PVin is connected to the photovoltaic panel or the car charger DC power supply, the third DCDC converter starts first and directly charges the low-voltage DC bus capacitor C1 slowly;

[0120] When the voltage of C1 reaches the rated threshold, the grounded MOS tube Q2 is closed and the battery pack starts to be charged.

[0121] This solution uses a battery pack composed of single cells connected in series and parallel. There is no independent voltage protection, current protection, and temperature protection circuit. This solution relies on analog front-end sampling chips and low-voltage MCU communication to protect the battery by controlling the start and stop of the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter to avoid overvoltage, undervoltage, overcurrent, overtemperature and other faults during battery use. The batteries of existing solutions usually use dedicated batteries or batteries for other equipment. In order to ensure the safety of the battery module, it is necessary to integrate the protection functions of the battery management system, such as voltage protection, current protection, and temperature protection. Compared with existing solutions, this solution is lower in cost.

[0122] This solution integrates the power system of the entire portable mobile power supply. Considering that the first bidirectional DCDC converter, the second DCDC converter, the third DCDC converter, and the fourth DCDC converter are all independently controlled to start and stop, the start and stop of each component are used to realize the charging MOS and discharging MOS functions of the BMS, thereby reducing the cost of the BMS components (in a system with a BMS, when the battery is over-voltage, charging over-temperature, or charging low temperature, the BMS will control the charging MOS to disconnect and stop charging the battery; when the battery is under-voltage, discharging over-temperature, or discharging low temperature, the BMS will control the discharging MOS to disconnect and stop discharging the battery); and because the power system is integrated together, the BMS, the photovoltaic charging circuit, the low-voltage DC circuit, and the first bidirectional DCDC converter can be controlled by a low-voltage MCU control chip, saving the communication between the components and the cost of the MCU; in addition, the various power components of the original solution are connected by power cables, and because the power system is integrated together, the wiring harness cost can also be greatly reduced.

[0123] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A portable energy storage system comprising an electrically connected battery pack and a power integration system, characterized in that: The power integration system includes: an analog front-end sampling chip, a first bidirectional DCDC converter, a bidirectional inverter, a low-voltage MCU, a driving circuit and a sampling circuit; The low voltage MCU is used to communicate with the analog front-end sampling chip to read the battery pack data; it is also used to obtain the working data of the first bidirectional DCDC converter from the sampling circuit; it is also used to generate a control instruction for the first bidirectional DCDC converter to charge or discharge the battery pack according to the battery pack data and the working data of the first bidirectional DCDC converter; The driving circuit is used to execute the control instruction of the low-voltage MCU to the first bidirectional DCDC converter.

2. The portable energy storage system according to claim 1, characterized in that: The power integration system also includes: a high-voltage MCU, a current-sense resistor, an isolation communication circuit and a soft-start circuit; The first bidirectional DCDC converter is electrically connected to the positive electrode and the negative electrode of the battery pack through the low voltage DC bus bars P+ and P-, respectively; The first bidirectional DCDC converter is electrically connected to the bidirectional inverter via high-voltage DC bus Bus+ and Bus-; The bidirectional inverter is electrically connected to the AC input terminal ACin and the AC output terminal ACout respectively; The current sensing resistor is electrically connected between the analog front-end sampling chip and the low-voltage DC bus P-; The low voltage MCU is connected to the high voltage MCU through an isolated communication circuit; The soft start circuit is electrically connected to the low voltage DC bus bars P+ and P- respectively; The high-voltage MCU is used to obtain the AC input voltage and the high-voltage DC bus voltage from the sampling circuit; and generate control instructions for the bidirectional inverter to work in the charging state according to the AC input voltage; The low-voltage MCU is used to generate a control instruction for the first bidirectional DCDC converter to discharge the battery pack during discharge, and to increase the high-voltage DC bus voltage to the rated voltage; the high-voltage MCU is also used to determine that after the high-voltage DC bus voltage has increased to the rated voltage, generate a control instruction for the bidirectional inverter to operate in a discharge state; The drive circuit is also used to execute control instructions of the high-voltage MCU to the bidirectional inverter.

3. The portable energy storage system according to claim 2, characterized in that: The power integration system also includes a second DCDC converter; the second DCDC converter is electrically connected to the soft start circuit, the low voltage DC bus P+, P-, and the high voltage DC bus Bus+, Bus- respectively.

4. The portable energy storage system according to claim 3, characterized in that: The power integration system further includes a third DCDC converter and a fourth DCDC converter; the third DCDC converter is electrically connected to the PV+ terminal and the PV- terminal respectively; the third DCDC converter is also electrically connected to the low-voltage DC bus P+ and the soft-start circuit; The fourth DCDC converter is electrically connected to the third DCDC converter, the low voltage DC bus P+ and the soft start circuit respectively; the fourth DCDC converter is also electrically connected to the DCout terminal.

5. The portable energy storage system according to claim 4, characterized in that: The battery pack data detected by the analog front-end sampling chip includes the voltage of each single cell and the battery pack current; The low voltage MCU is used to calculate the battery pack voltage based on the single cell voltage.

6. The portable energy storage system according to claim 5, characterized in that: The low voltage MCU is also used to obtain the working data of the second DCDC converter, the third DCDC converter, and the fourth DCDC converter from the sampling circuit, and the working data includes working voltage, working current, and working temperature; It is also used to generate a discharge control instruction for the second DCDC converter to the battery pack, a charge control instruction for the third DCDC converter to the battery pack, and a discharge control instruction for the fourth DCDC converter to the battery pack; The driving circuit is also used to execute control instructions of the low-voltage MCU on the second DCDC converter, the third DCDC converter, and the fourth DCDC converter.

7. The portable energy storage system according to claim 6, characterized in that: The second DCDC converter is used to discharge the battery pack when the load power is lower than the preset power for a continuous preset time; The third DCDC converter is used to charge the battery pack when external DC power is connected; The fourth DCDC converter is used to convert the battery pack voltage into a low-voltage DC preset output voltage for external output.

8. The portable energy storage system according to claim 2, characterized in that: The soft start circuit includes: a low voltage DC bus capacitor C1, a pre-charge resistor R1, a pre-charge MOS tube Q1, a grounding MOS tube Q2, and a discharge resistor R2; One end of the low-voltage DC bus capacitor C1 is connected to the low-voltage DC bus P+, and the other end of the low-voltage DC bus capacitor C1 is connected to one end of the pre-charging resistor R1; The other end of the pre-charging resistor R1 is connected to one end of the pre-charging MOS tube Q1, and the other end of the pre-charging MOS tube Q1 is connected to the low-voltage DC bus P-; One end of the discharge resistor R2 is connected to the low voltage DC bus P+, and the other end of the discharge resistor R2 is connected to one end of R1; One end of the grounded MOS tube Q2 is respectively connected to the other end of R2, the third DCDC converter and the fourth DCDC converter; the other end of the grounded MOS tube Q2 is connected to the low-voltage DC bus P-; The soft start circuit is used to pre-charge the low voltage DC bus capacitor C1.

9. A portable energy storage system control method, applied to the system according to any one of claims 1 to 8, characterized in that: It includes the following: Read the battery pack data through the analog front-end sampling chip and obtain the working data of the first bidirectional DCDC converter through the sampling circuit; The first bidirectional DCDC converter is controlled to operate in a charging or discharging state according to the battery pack data and the operating data.

10. The portable energy storage system control method according to claim 9, characterized in that: Also obtaining the working data of the second DCDC converter, the third DCDC converter, and the fourth DCDC converter through the sampling circuit; Controlling the second DCDC converter, the third DCDC converter, and the fourth DCDC converter to operate in a charging or discharging state according to the operating data; Communicate with the high-voltage MCU through an isolated communication circuit; The high-voltage MCU obtains the AC input voltage and the high-voltage DC bus voltage from the sampling circuit; according to the AC input voltage, the bidirectional inverter is operated in a charging state; according to the high-voltage DC bus voltage, the bidirectional inverter is controlled to work in coordination with the first bidirectional DCDC converter and / or the second DCDC converter, so that the bidirectional inverter works in a discharging state.

Images