Control circuit of outdoor energy storage device and outdoor energy storage device

Abstract

The utility model discloses a control circuit of an outdoor energy storage device and the outdoor energy storage device, the control circuit comprises a charge and discharge control unit, the charge and discharge control unit comprises a first connecting end and a second connecting end, the first connecting end is used for being electrically connected with electric equipment, and the second connecting end is used for being electrically connected with a storage battery. The parallel operation control module can control connection or disconnection between the third connecting end and the fourth connecting end, and the monitoring module is used for obtaining the voltage of the second connecting end to generate a first voltage value and obtaining the voltage of the fourth connecting end to generate a second voltage value. And the main control module is configured to compare the first voltage value and the second voltage value acquired by the monitoring module, and control at least one of the parallel operation control module and the charging and discharging control unit to work according to a comparison result. By detecting the potential difference between the storage batteries of the host and the slave and controlling the current flow direction in the parallel operation process, the process of gradually balancing the potential difference is realized, and the parallel operation safety and reliability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage power technology, and in particular to a control circuit for an outdoor energy storage device and an outdoor energy storage device. Background Technology

[0002] Outdoor power supplies typically consist of components such as lithium battery packs, inverters, and battery management systems (BMS), providing stable power support for various electronic devices and household appliances. Currently, most outdoor power supplies on the market use an individually packaged design, with each unit containing a battery pack of fixed capacity and an inverter system with limited power. As users' requirements for power capacity and battery life increase, using multiple battery packs in parallel has become an important solution.

[0003] In existing technologies, parallel connection of outdoor power supplies typically requires that the multiple power supplies connected in parallel have similar states of charge (SOC), and that the main power supply and slave power supplies be connected together through dedicated communication interfaces and connecting cables to provide power. This parallel connection method is generally only supported when the power supply SOCs are similar, and the parallel connection process requires strict operating procedures.

[0004] However, when the SOC difference between the master and slave power supplies is large (e.g., one is 0% and the other is 100%), a sharp potential difference will be generated during the parallel connection process, resulting in instantaneous large current and sparks, which poses a safety hazard. Utility Model Content

[0005] The main purpose of this invention is to propose a control circuit for an outdoor energy storage device, which aims to solve the safety hazards existing in the parallel connection of existing master and slave power supplies.

[0006] To achieve the above objectives, this utility model proposes a control circuit for an outdoor energy storage device, which includes:

[0007] A charge-discharge control unit, comprising a first connection terminal and a second connection terminal, wherein the first connection terminal is used for electrically connecting to an electrical device and the second connection terminal is used for electrically connecting to a storage battery;

[0008] The parallel operation control module includes a third connection terminal and a fourth connection terminal. The third connection terminal is electrically connected to the first connection terminal, and the fourth connection terminal is used to electrically connect to another outdoor energy storage device. The parallel operation control module can control the connection between the third connection terminal and the fourth connection terminal to be turned on or off.

[0009] A monitoring module is electrically connected to the second connection terminal and the fourth connection terminal respectively. The monitoring module is used to acquire the voltage of the second connection terminal to generate a first voltage value, and to acquire the voltage of the fourth connection terminal to generate a second voltage value.

[0010] The main control module is electrically connected to the charge / discharge control unit, the parallel operation control module, and the monitoring module. The main control module is configured to compare a first voltage value and a second voltage value obtained by the monitoring module, and control at least one of the parallel operation control module and the charge / discharge control unit to operate based on the comparison result.

[0011] In some embodiments, the parallel control module includes:

[0012] A first control module, the first control module includes a first trigger terminal and a first output terminal, the first trigger terminal being electrically connected to the main control module;

[0013] A switch module, wherein the switch module is electrically connected to the third connection terminal, the fourth connection terminal and the first output terminal respectively;

[0014] The first control module is used to process the control signal received by the main control module from the first trigger terminal and output a level signal through the first output terminal; the switch module operates based on the level signal of the first output terminal to turn on or off the electrical connection between the third connection terminal and the fourth connection terminal.

[0015] In some embodiments, the first control module includes:

[0016] A first optocoupler, comprising a first pin, a second pin, a third pin, and a fourth pin, wherein the first pin and the third pin are electrically connected to a power supply;

[0017] The first switching transistor has its second pin grounded via the first switching transistor, and the control terminal of the first switching transistor is electrically connected to the first trigger terminal.

[0018] The first transistor has its collector electrically connected to the power supply, its emitter connected to the first output terminal, and its base electrically connected to the fourth pin.

[0019] In some embodiments, the switching module includes at least one second switching transistor, the gate of the second switching transistor is electrically connected to the first output terminal, the source of the second switching transistor is electrically connected to the fourth connection terminal, and the drain of the second switching transistor is electrically connected to the third connection terminal.

[0020] In some embodiments, the number of parallel control modules is set to multiple, and the fourth connection terminal of the multiple parallel control modules is used to connect to different outdoor energy storage devices.

[0021] In some embodiments, the monitoring module includes:

[0022] The host voltage monitoring module includes a first monitoring terminal and a first feedback terminal. The first monitoring terminal is electrically connected to the second connection terminal, and the first feedback terminal is connected to the main control module.

[0023] In some embodiments, the monitoring module further includes:

[0024] The slave voltage monitoring module includes a second monitoring terminal and a second feedback terminal. The second monitoring terminal is electrically connected to the fourth connection terminal, and the second feedback terminal is connected to the master control module.

[0025] In some embodiments, the charge / discharge control unit includes a first control unit and a charging control unit. The first control unit includes a first control terminal, a first conduction terminal, and a second conduction terminal. The first conduction terminal is electrically connected to the battery, and the second conduction terminal is electrically connected to the first connection terminal.

[0026] The charging control unit includes:

[0027] The second optocoupler includes a fifth pin, a sixth pin, a seventh pin, and an eighth pin, wherein the fifth pin and the seventh pin are electrically connected to a power supply.

[0028] The collector of the second transistor is electrically connected to the power supply, the base is electrically connected to the other eighth pin, and the emitter is electrically connected to the first control terminal.

[0029] The third switch transistor is connected to the main control module via the sixth pin, and the control terminal of the third switch transistor is electrically connected to the main control module.

[0030] In some embodiments, the charge / discharge control unit further includes a second control unit and a discharge control unit;

[0031] The second control unit includes a second control terminal, a third conduction terminal, and a fourth conduction terminal. The third conduction terminal is electrically connected to the first connection terminal, and the fourth conduction terminal is electrically connected to the first conduction terminal.

[0032] The discharge control unit includes:

[0033] The third optocoupler includes a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, and a thirteenth pin. The ninth pin and the eleventh pin are electrically connected to the power supply, the twelfth pin is electrically connected to the second control terminal, and the thirteenth pin is electrically connected to the base of the second transistor.

[0034] The third switch transistor, the tenth pin of which is grounded through the third switch transistor, and the control terminal of the third switch transistor is electrically connected to the main control module.

[0035] The present invention further proposes an outdoor energy storage device, including a battery and a control circuit for the outdoor energy storage device as described in the foregoing embodiments.

[0036] The beneficial effects of this utility model's technical solution are as follows: By setting a monitoring module to acquire the voltage of the second and fourth connection terminals in real time, and generating a first voltage value and a second voltage value respectively, the main control module controls at least one of the parallel operation control module and the charge / discharge control unit to work based on the comparison results. Specifically, when the second voltage value is greater than the first voltage value, the main control module instructs the charge / discharge control unit to stop working and simultaneously activates the parallel operation control module, at which time another outdoor energy storage device is used to supply power to the electrical equipment; when the second voltage value is less than the first voltage value, the main control module instructs the parallel operation control module to disconnect the connection between the third and fourth connection terminals, and another outdoor energy storage device (slave) is in standby mode, while simultaneously activating the charge / discharge control unit, using the outdoor energy storage device (master) to supply power to the electrical equipment; when the second voltage value is greater than the first voltage value, the main control module simultaneously activates the charge / discharge control unit and the parallel operation control module, enabling the two outdoor energy storage devices to achieve equipotential parallel operation and jointly provide power to the electrical equipment through the first connection terminal. In this way, by detecting the potential difference between the master and slave batteries and controlling the current flow during parallel operation, the potential difference is gradually balanced. Even when the SOC difference between the master and slave batteries is very large, the instantaneous large current and sparks generated during parallel operation can be avoided, thus improving the safety and reliability of the system parallel operation. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the module electrical connections of the control circuit of an outdoor energy storage device in one embodiment of the present invention;

[0038] Figure 2 This is a partial circuit diagram of the control circuit of an outdoor energy storage device in one embodiment of the present invention;

[0039] Figure 3 This is a partial circuit diagram of the control circuit of an outdoor energy storage device in one embodiment of the present invention;

[0040] Figure 4 This is a partial circuit diagram of the control circuit of an outdoor energy storage device in one embodiment of the present invention.

[0041] Explanation of icon numbers:

[0042] 10. Charge / discharge control unit; 10A. First connection terminal; 10B. Second connection terminal;

[0043] 11. First control unit; 11A. First control terminal; A1. First conducting terminal; A2. Second conducting terminal;

[0044] 12. Charging control unit; U2. Second optocoupler; B5. Fifth pin; B6. Sixth pin; B7. Seventh pin; B8. Eighth pin; Q22. Second transistor; Q13. Third switching transistor;

[0045] 13. Second control unit; 13A. Second control terminal; A3. Third conducting terminal; A4. Fourth conducting terminal;

[0046] 14. Discharge control unit; U3. Third optocoupler; B9. Ninth pin; B10. Tenth pin; B11. Eleventh pin; B12. Twelfth pin; B13. Thirteenth pin; Q14. Fourth switching transistor;

[0047] 20. Parallel control module; 20A. Third connection terminal; 20B. Fourth connection terminal;

[0048] 21. First control module; 21A. First trigger terminal; 21B. First output terminal;

[0049] U1, first optocoupler; B1, first pin; B2, second pin; B3, third pin; B4, fourth pin; Q11, first switching transistor; Q21, first transistor;

[0050] 22. Switching module; Q12. Second switching transistor;

[0051] 30. Monitoring module; 31. Main unit voltage monitoring module; 31A. First monitoring terminal; 31B. First feedback terminal; 32. Slave unit voltage monitoring module; 32A. Second monitoring terminal; 33A. Second feedback terminal;

[0052] 40. Main control module.

[0053] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0055] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0056] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0057] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0058] Reference Figure 1 and Figure 2 This utility model provides a control circuit for an outdoor energy storage device, which includes:

[0059] A charge / discharge control unit 10 includes a first connection terminal 10A and a second connection terminal 10B. The first connection terminal 10A is used to electrically connect to the electrical equipment, and the second connection terminal 10B is used to electrically connect to the storage battery.

[0060] Parallel operation control module 20 includes a third connection terminal 20A and a fourth connection terminal 20B. The third connection terminal 20A is electrically connected to the first connection terminal 10A, and the fourth connection terminal 20B is used to electrically connect to another outdoor energy storage device. The parallel operation control module 20 can control the connection between the third connection terminal 20A and the fourth connection terminal 20B to be turned on or off.

[0061] The monitoring module 30 is electrically connected to the second connection terminal 10B and the fourth connection terminal 20B respectively. The monitoring module 30 is used to acquire the voltage of the second connection terminal 10B to generate a first voltage value, and to acquire the voltage of the fourth connection terminal 20B to generate a second voltage value.

[0062] The main control module 40 is electrically connected to the charge / discharge control unit 10, the parallel operation control module 20, and the monitoring module 30. The main control module is configured to compare a first voltage value and a second voltage value obtained by the monitoring module 30, and control at least one of the parallel operation control module 20 and the charge / discharge control unit 10 to work according to the comparison result.

[0063] In this embodiment, the charge / discharge control unit 10 includes a first connection terminal 10A and a second connection terminal 10B, wherein the first connection terminal 10A is used for electrically connecting to the electrical equipment, and the second connection terminal 10B is used for electrically connecting to the battery. The main function of the charge / discharge control unit 10 in this embodiment is to control and manage the discharge or charging of the battery. The charge / discharge control unit 10 in this embodiment can be built using MOSFET switching transistors, such as N-channel MOSFETs like IRF540N and IRFP250N, or P-channel MOSFETs like IRF9540 and IRFP9240; it can also be implemented using related charge / discharge management chips, such as lithium battery charge / discharge management chips like BQ24650, BQ24735, and MP2667, or multi-functional charge / discharge controller chips like LT8490 and LT8705.

[0064] In this embodiment, the parallel control module 20 mainly controls the parallel operation of this outdoor energy storage device (denoted as the master device) and another outdoor energy storage device (denoted as the slave device). Specifically, it determines whether to connect them in parallel by monitoring the voltage of the two outdoor energy storage devices. The parallel control module 20 can be built using IGBT switching transistors, such as IRG4PC40U, STGW30NC60W, etc.; or it can be implemented using relays, such as Panasonic JW series, Omron G6B series, etc.; or it can use thyristor modules such as 2CL2FM, MTG series, etc.

[0065] In this embodiment, the monitoring module 30 is mainly used to acquire the voltage of the second connection terminal 10B to generate a first voltage value, and to acquire the voltage of the fourth connection terminal 20B to generate a second voltage value. The monitoring module 30 can be implemented by using a voltage sampling resistor to divide the voltage and then connecting it to the ADC sampling channel; it can also be implemented using a dedicated voltage detection chip such as INA226 or INA219; or it can be implemented by using the ADC unit built into the MCU in conjunction with an operational amplifier such as LM358 or TL082 for signal conditioning. In this embodiment, the main control module 40 is mainly used to compare the first and second voltage values ​​acquired by the monitoring module 30, and to control at least one of the parallel control module 20 and the charge / discharge control unit 10 to operate based on the comparison result. Specifically, there are the following situations:

[0066] In this embodiment, when the slave device is connected to the fourth connection terminal 20B of the parallel control module 20, the system will operate according to the following process: First, the monitoring module 30 starts and detects the voltage of the fourth connection terminal 20B in real time and generates a second voltage value (slave voltage value), and at the same time detects the voltage of the second connection terminal 10B and generates a first voltage value (master voltage value). The master control module 40 continuously acquires these two voltage values, compares and analyzes them through a built-in algorithm, and controls the working state of the parallel control module 20 and the charging and discharging control unit 10 according to the preset voltage difference threshold and safe parallel operation strategy. For example, when the slave voltage value is detected to be greater than the master voltage value and the voltage difference exceeds the preset threshold (e.g., 0.5V), the master control module 40 instructs the charging and discharging control unit 10 to stop working, and at the same time activates the parallel control module 20. At this time, the power of the slave device will be directly output to the electrical equipment through the path of the fourth connection terminal 20B, the parallel control module 20, the third connection terminal 20A, and the first connection terminal 10A to achieve efficient energy utilization; when the slave voltage value is detected to be less than the master voltage value and the voltage difference exceeds the preset threshold, The main control module 40 instructs the parallel control module 20 to disconnect the connection between the third connection terminal 20A and the fourth connection terminal 20B, putting the slave device in standby mode. At the same time, the charging and discharging control unit 10 is activated. The host's power is output to the electrical equipment through the path of the second connection terminal 10B, the charging and discharging control unit 10, and the first connection terminal 10A, ensuring that the load receives a stable power supply. When the difference between the slave voltage value and the host voltage value is detected to be within a preset threshold range (e.g., ±0.2V), the main control module 40 simultaneously activates the charging and discharging control unit 10 and the parallel control module 20, enabling the two energy storage devices to operate in parallel at the same potential and jointly provide power to the electrical equipment through the first connection terminal 10A. In this mode, load balancing and maximum power supply capacity can be achieved. It should be noted that this embodiment adopts a safety strategy of "prioritizing high-potential power supply and gradually equipotential parallel operation". That is, when the voltage of one side is significantly higher than that of the other side, the system prioritizes the power output of the side with the higher potential to maximize the utilization of energy. At the same time, the main control module 40 will adjust the charging and discharging state of the battery through the charging and discharging control unit 10 to gradually make the two energy storage devices reach voltage balance, and finally achieve safe parallel operation, thereby improving the overall efficiency and reliability of the system.

[0067] The beneficial effects of this utility model's technical solution are as follows: By setting up a monitoring module 30 to acquire the voltages of the second connection terminal 10B and the fourth connection terminal 20B in real time, and generating a first voltage value and a second voltage value respectively, the main control module 40 controls the parallel operation control module 20 and the charge / discharge control unit 10 based on the comparison results, effectively solving the safety hazards caused by the parallel use of battery packs with different SOCs in the prior art. This solution adopts a "priority high-potential power supply, gradual equal-potential parallel operation" working strategy. By sensing the potential difference between the master and slave batteries and controlling the current flow direction and magnitude during the parallel operation, a gradual balancing process of the potential difference is achieved. Even when the SOC difference between the master and slave batteries is extremely large, it can avoid the instantaneous large current and sparks generated during parallel operation, significantly improving the safety and reliability of the system's parallel operation. In addition, this solution, through the intelligent judgment algorithm of the main control module 40, can automatically select the optimal power supply scheme, ensuring a continuous and stable power supply to the electrical equipment while maximizing the utilization of outdoor energy storage device resources, improving the overall system's energy efficiency and service life.

[0068] Continue reading Figure 2 In this embodiment, the parallel operation control module 20 includes:

[0069] The first control module 21 includes a first trigger terminal 21A and a first output terminal 21B. The first trigger terminal 21A is electrically connected to the main control module.

[0070] Switch module 22 is electrically connected to the third connection terminal 20A, the fourth connection terminal 20B and the first output terminal 21B respectively;

[0071] The first control module 21 is used to process the control signal received by the main control module from the first trigger terminal 21A and output a level signal through the first output terminal 21B; the switch module 22 operates based on the level signal of the first output terminal 21B to conduct or disconnect the electrical connection between the third connection terminal 20A and the fourth connection terminal 20B.

[0072] In this embodiment, the first control module 21 is mainly used for signal processing and amplification. Specifically, since the control signal output by the main control module may have insufficient voltage amplitude and cannot directly drive the switching module 22, the first control module 21 needs to process it appropriately. The first control module 21 can be implemented using an operational amplifier circuit, such as a voltage comparator or amplifier circuit constructed from general-purpose operational amplifier chips like LM358 and LM324; it can also be implemented using dedicated driver chips such as UCC27211 and IR2110 gate drivers; or it can use a Darlington pair circuit constructed from transistors to amplify the signal. The switching module 22 can be a high-power MOSFET such as IRFP460 or STW45NM50; or an IGBT module such as CM75DU-12H or FGH40N60SMD; or a mechanical relay such as HF115F or JQX-13F, used to actually control the conduction or disconnection between the third connection terminal 20A and the fourth connection terminal 20B.

[0073] In the operation of this embodiment, when the master control module needs to control the parallel connection of the master and slave devices based on the comparison result of the first voltage value and the second voltage value, it sends a low-level or high-level control signal to the first control module 21 through the first trigger terminal 21A. After receiving this signal, the first control module 21 performs level conversion and power amplification processing, converting the original weak control signal into an output signal with sufficient driving capability, and transmits it to the switch module 22 through the first output terminal 21B. The switch module 22 performs corresponding turn-on or turn-off operations according to the received level signal, thereby changing the electrical connection state between the third connection terminal 20A and the fourth connection terminal 20B. For example, when the master control module determines that the voltage difference between the master and slave devices is within a preset threshold range, it sends a turn-on signal, which, after processing by the first control module 21, drives the switch module 22 to turn on, realizing the parallel operation of the master and slave devices; conversely, when the voltage difference is detected to exceed the safe range, the master control module sends a turn-off signal, which, after processing by the first control module 21, instructs the switch module 22 to disconnect, avoiding an unsafe parallel operation state. In this way, by adding a signal conditioning stage, the matching problem between the control signal and the actuator is effectively solved, the system response speed and reliability are improved, and hardware protection is provided for safe parallel operation.

[0074] Further reading Figure 2 The first control module 21 includes:

[0075] The first optocoupler U1 includes a first pin B1, a second pin B2, a third pin B3 and a fourth pin B4, with the first pin B1 and the third pin B3 electrically connected to a power supply.

[0076] The first switching transistor Q11 is connected to the second pin B2 via the first switching transistor Q11, and the control terminal of the first switching transistor Q11 is electrically connected to the first trigger terminal 21A.

[0077] The first transistor Q21 has its collector electrically connected to the power supply, its emitter connected to the first output terminal 21B, and its base electrically connected to the fourth pin B4.

[0078] In this embodiment, the first optocoupler U1 is the core component of the circuit, including a first pin B1, a second pin B2, a third pin B3, and a fourth pin B4. The first pin B1 and the third pin B3 are electrically connected to the power supply, ensuring a stable operating voltage for the internal LED and phototransistor. The first optocoupler U1 can be a general-purpose optocoupler such as PC817 or TLP521 to achieve electrical isolation between the input and output terminals, effectively preventing electrical interference between the main control module and the power circuit. The first switching transistor Q11 is connected between the second pin B2 and ground, and its control terminal is electrically connected to the first trigger terminal 21A. It can be a low-power switching transistor or a transistor such as 2N7000 or 2N2222. The first transistor Q21 can be a medium-power transistor such as 8050 or TIP122. Its collector is electrically connected to the power supply, its emitter is connected to the first output terminal 21B, and its base is electrically connected to the fourth pin B4, used for signal amplification and providing sufficient driving capability.

[0079] The working principle of this embodiment is as follows: when the main control module needs to control parallel operation, it outputs a control signal to the first switching transistor Q11 through the first trigger terminal 21A. For example, when the control signal is high, the first switching transistor Q11 is turned on. At this time, a path is formed between the first pin B1 and the second pin B2, and current flows through the light-emitting diode inside the optocoupler, causing it to emit light. The light emitted by the light-emitting diode illuminates the phototransistor in the same package, causing the third pin B3 and the fourth pin B4 to conduct, forming a current path. Since the third pin B3 is connected to the power supply, current flows through the fourth pin B4 to the base of the first transistor Q21, driving the first transistor Q21 to conduct. After the first transistor Q21 is turned on, since its collector is connected to the external power supply, its emitter will output a stable high-level signal to the first output terminal 21B, providing a reliable drive signal for the switching module 22. Conversely, when the main control module outputs a low-level signal, the first switch Q11 is turned off, the internal LED of the optocoupler does not emit light, the phototransistor does not conduct, and the first transistor Q21 is also turned off. The first output terminal 21B outputs a low-level signal, and the switch module 22 remains off. This opto-isolated control method not only enhances the signal's anti-interference capability but also achieves electrical isolation between the main control circuit and the power circuit, greatly improving the system's reliability and stability in complex electromagnetic environments and providing a solid hardware guarantee for the safe parallel operation of outdoor energy storage devices.

[0080] Continue reading Figure 2 In this embodiment, the switching module 22 includes at least one second switching transistor Q12. The gate of the second switching transistor Q12 is electrically connected to the first output terminal 21B, the source of the second switching transistor Q12 is electrically connected to the fourth connection terminal 20B, and the drain of the second switching transistor Q12 is electrically connected to the third connection terminal 20A.

[0081] In this embodiment, the switching module 22 can be constructed using multiple second switching transistors Q12. These second switching transistors Q12 can be high-power N-channel MOSFETs such as IRF540N, IRFP4568, and STW55NM60N, or high-voltage MOSFETs such as IXYS IXFH60N50P3 and IXTH96N20P; or high-power IGBTs such as APT60M75B2 and FGA25N120ANTD can also be used. Specifically, the gates of the multiple MOSFETs are all electrically connected to the first output terminal 21B to receive a unified control signal; the sources are electrically connected to the fourth connection terminal 20B for connecting to the slave power supply; and the drains are electrically connected to the third connection terminal 20A for connecting to the host circuit. In this way, when the first control module 21 outputs a high-level signal to the first output terminal 21B, all the second switching transistors Q12 are turned on simultaneously, establishing a low-impedance path between the third connection terminal 20A and the fourth connection terminal 20B, realizing the parallel operation of the master and slave devices; when the output is low-level, all the second switching transistors Q12 are turned off simultaneously, cutting off the connection between the master and slave devices.

[0082] By increasing the number of parallel switching transistors, the current carrying capacity of the system can be improved. For each additional parallel switching transistor, the maximum current that the system can carry increases accordingly, meeting the parallel operation requirements of high-power outdoor energy storage devices. Secondly, using multiple switching transistors in parallel can reduce the equivalent on-resistance (RDS(on)) of the system, reduce the heat generated by the power switch in the on state, improve energy transfer efficiency, and reduce energy loss. In addition, the parallel structure enhances the redundancy and reliability of the system. Even if individual switching transistors fail, the system can still maintain basic functions, avoiding the paralysis of the entire unit due to a single point of failure.

[0083] In some embodiments, the number of parallel control modules 20 is set to multiple, and the fourth connection terminal 20B of the multiple parallel control modules 20 is used to connect to different outdoor energy storage devices.

[0084] Specifically, the outdoor energy storage device in this embodiment can be configured with two, three, or even more parallel control modules 20. The fourth connection terminal 20B of each parallel control module 20 is used to connect to different slave devices, forming a star topology of "one master and multiple slaves". For example, in a three-module design, the master can establish electrical connections with three slave devices simultaneously, significantly improving the overall power supply capacity and continuous working time of the system. These parallel control modules 20 can adopt the same circuit structure, including the aforementioned first control module 21 and switch module 22, but each module works independently and has its own control logic and circuit path.

[0085] This multi-parallel interface enables modular expansion of outdoor energy storage systems. Users can flexibly connect different numbers of slave devices according to actual power demand, meeting diverse power supply scenarios from small-power devices to high-power loads. Secondly, the main control module 40 can independently manage each parallel control module 20, deciding whether to work in parallel based on the voltage status of each slave device, thus achieving a more refined energy management strategy.

[0086] Continue reading Figure 3 and Figure 4 In this embodiment, the monitoring module 30 includes:

[0087] The host voltage monitoring module 31 includes a first monitoring terminal 31A and a first feedback terminal 31B. The first monitoring terminal 31A is electrically connected to the second connection terminal 10B, and the first feedback terminal 31B is connected to the main control module.

[0088] Furthermore, the monitoring module also includes:

[0089] The slave voltage monitoring module 32 includes a second monitoring terminal 32A and a second feedback terminal 33A. The second monitoring terminal 32A is electrically connected to the fourth connection terminal 20B, and the second feedback terminal 33A is connected to the main control module.

[0090] In this embodiment, the monitoring module adopts hierarchical monitoring, including a master voltage monitoring module 31 and multiple slave voltage monitoring modules 32, to meet the voltage monitoring requirements of a multi-slave parallel system.

[0091] The host voltage monitoring module 31 includes a first monitoring terminal 31A and a first feedback terminal 31B. The first monitoring terminal 31A is electrically connected to the second connection terminal 10B (i.e., the battery connection terminal), and the first feedback terminal 31B is connected to the main control module. This module can be implemented using a resistor divider network with an operational amplifier such as LM358 to construct a buffer circuit; it can also use a dedicated voltage detection chip such as INA219 or MAX471; or it can utilize the built-in ADC unit of the MCU with a voltage sampling circuit. The host voltage monitoring module 31 is responsible for acquiring the voltage of the host battery in real time, converting it into a level signal that the main control module can recognize, and transmitting it to the main control module through the first feedback terminal 31B, providing basic data for subsequent parallel operation decisions.

[0092] In a system configuration where a master unit connects to multiple slave units, multiple parallel control modules 20 are configured, and correspondingly, multiple slave voltage monitoring modules 32 are also configured, forming a one-to-one monitoring and control relationship. Each slave voltage monitoring module 32 includes a second monitoring terminal 32A and a second feedback terminal 33A. The second monitoring terminals 32A of different slave voltage monitoring modules 32 are electrically connected to the fourth connection terminals 20B of different parallel control modules 20 to acquire the voltage information of each slave unit. The second feedback terminals 33A of all slave voltage monitoring modules 32 are electrically connected to the master control module, centrally feeding back the collected voltage data. In this way, the master control module can simultaneously acquire multiple slave voltage data, perform comprehensive comparison and analysis.

[0093] This embodiment enables independent monitoring of each slave device, ensuring that the system can accurately grasp the voltage status of each slave device and provide data support for refined energy management. Secondly, the master control module can execute more complex parallel operation strategies based on multiple voltage data, such as priority parallel operation, sequential parallel operation, or load balancing parallel operation. In addition, the independent monitoring path improves the system's anti-interference capability and fault isolation capability, avoiding the impact of single-point failure on the overall monitoring function.

[0094] See Figure 3 In this embodiment, the charge and discharge control unit 10 includes a first control unit 11 and a charging control unit 12. The first control unit 11 includes a first control terminal 11A, a first conduction terminal A1 and a second conduction terminal A2. The first conduction terminal A1 is electrically connected to the battery, and the second conduction terminal A2 is electrically connected to the first connection terminal 10A.

[0095] The charging control unit 12 includes:

[0096] The second optocoupler U2 includes a fifth pin B5, a sixth pin B6, a seventh pin B7, and an eighth pin B8. The fifth pin B5 and the seventh pin B7 are electrically connected to the power supply.

[0097] The collector of the second transistor Q22 is electrically connected to the power supply, the base is electrically connected to another eighth pin B8, and the emitter is electrically connected to the first control terminal 11A.

[0098] The third switch Q13, pin B6 is grounded through the third switch Q13, and the control terminal of the third switch Q13 is electrically connected to the main control module.

[0099] In this embodiment, the charging control unit 12 employs an opto-isolated drive circuit, comprising three key components: a second optocoupler U2, a second transistor Q22, and a third switch Q13. The second optocoupler U2 includes pins B5, B6, B7, and B8, with pins B5 and B7 electrically connected to the power supply to ensure the normal operation of the internal components. The second optocoupler U2 can be a general-purpose optocoupler such as EL817, PC817, or TLP521 to achieve electrical isolation transmission of signals. The collector of the second transistor Q22 is electrically connected to the power supply, the base is electrically connected to pin B8, and the emitter is electrically connected to the first control terminal 11A. It can be an amplifying transistor such as 8050 or TIP122 for signal amplification and level conversion. Pin B6 is grounded via the third switch Q13, and the control terminal of the third switch Q13 is electrically connected to the main control module to receive control commands. It can be a small-signal transistor or MOSFET such as 2N7000 or 2N2222.

[0100] The charging and discharging control principle of this embodiment is as follows: For example, when the main control module needs to control battery charging, it outputs a high-level signal to the control terminal of the third switch Q13, causing the third switch Q13 to conduct. After the third switch Q13 conducts, a path is formed between the sixth pin B6 and ground, allowing current to flow between the fifth pin B5 and the sixth pin B6, driving the light-emitting diode inside the second optocoupler U2 to emit light. The light emitted by the light-emitting diode illuminates the phototransistor in the same package, causing conduction between the seventh pin B7 and the eighth pin B8, forming a current path. Since the seventh pin B7 is connected to the power supply, current flows through the eighth pin B8 to the base of the second transistor Q22, driving the second transistor Q22 to conduct. After the second transistor Q22 conducts, its emitter outputs a stable high-level signal to the first control terminal 11A, activating the first control unit 11.

[0101] After the first control unit 11 is activated, its internal circuitry creates a low-resistance path between the first conducting terminal A1 and the second conducting terminal A2, establishing a power transmission channel between the battery and the electrical equipment. The first control unit 11 can achieve two operating modes: in charging mode, electrical energy flows from the second conducting terminal A2 (the electrical equipment end) to the first conducting terminal A1 (the battery end), thereby charging the battery.

[0102] See Figure 3 In this embodiment, the charge / discharge control unit 10 further includes a second control unit 13 and a discharge control unit 14;

[0103] The second control unit 13 includes a second control terminal 13A, a third conduction terminal A3 and a fourth conduction terminal A4. The third conduction terminal A3 is electrically connected to the second connection terminal 10B and the fourth conduction terminal A4 is electrically connected to the first conduction terminal A1.

[0104] The discharge control unit 14 includes:

[0105] The third optocoupler U3 includes a ninth pin B9, a tenth pin B10, an eleventh pin B11, a twelfth pin B12, and a thirteenth pin B13. The ninth pin B9 and the eleventh pin B11 are electrically connected to the power supply, the twelfth pin B12 is electrically connected to the second control terminal 13A, and the thirteenth pin B13 is electrically connected to the base of the second transistor Q22.

[0106] The fourth switch Q14, pin B10 is grounded through the third switch Q13, and the control terminal of the third switch Q13 is electrically connected to the main control module.

[0107] In this embodiment, in addition to the aforementioned first control unit 11 and charging control unit 12, the charging and discharging control unit 10 also includes a second control unit 13 and a discharging control unit 14, forming a complete bidirectional control system.

[0108] The second control unit 13 includes a second control terminal 13A, a third conduction terminal A3, and a fourth conduction terminal A4, wherein the third conduction terminal A3 is electrically connected to the second connection terminal 10B, and the fourth conduction terminal A4 is electrically connected to the first conduction terminal A1. The second control unit 13 can be constructed using P-channel MOSFETs such as IRF9540 and IRFP9240, or corresponding IGBT modules, to control the flow of electrical energy during the discharge process. The discharge control unit 14 adopts a similar opto-isolated drive design to the discharge control unit 14, but adds additional control paths to achieve more complex collaborative control functions.

[0109] The discharge control unit 14 includes key components such as the third optocoupler U3 and the third switch Q13. The third optocoupler U3 is a five-pin optocoupler, including pins B9, B10, B11, B12, and B13. Pins B9 and B11 are electrically connected to the power supply, pin B12 is electrically connected to the second control terminal 13A, and pin B13 is electrically connected to the base of the second transistor Q22. The third optocoupler U3 can be a multi-output type such as TLP521-4 or ILD213T. Pin B10 is grounded through the third switch Q13, and the control terminal of the third switch Q13 is electrically connected to the main control module to receive discharge control commands.

[0110] The working principle of this embodiment is similar to that of the discharge control unit 14, but it has a more complex cooperative control path. Specifically, when the system needs to perform a discharge operation, the main control module outputs a high-level signal to the control terminal of the fourth switch Q14, turning on the fourth switch Q14. After the fourth switch Q14 is turned on, a path is formed between the tenth pin B10 and ground, allowing current to flow between the ninth pin B9 and the tenth pin B10, driving the light-emitting diode inside the third optocoupler U3 to emit light. The light emitted by the light-emitting diode illuminates the photosensitive element inside the optocoupler, simultaneously affecting two output channels: on the one hand, it connects the eleventh pin B11 and the twelfth pin B12. Since the eleventh pin B11 is connected to the power supply, the twelfth pin B12 outputs a power signal to the second control terminal 13A, activating the second control unit 13; on the other hand, it also connects the eleventh pin B11 and the thirteenth pin B13, causing the thirteenth pin B13 to simultaneously output a power signal to the base of the second transistor Q22, driving the second transistor Q22 to work.

[0111] Unlike the charging control unit 12, this embodiment implements the function of "one control and two drives". When the discharge control is activated, it not only drives the second control unit 13 to work and establishes the power channel between the third conducting terminal A3 and the fourth conducting terminal A4 to realize the discharge path from the battery to the electrical equipment, but also drives the second transistor Q22 to work through the signal output by the thirteenth pin B13, indirectly controlling the first control unit 11 to ensure that the path state between the first conducting terminal A1 and the second conducting terminal A2 matches the discharge requirements.

[0112] This utility model further proposes an outdoor energy storage device, including a battery and a control circuit for the outdoor energy storage device as described in the foregoing embodiments. The specific structure of the control circuit for this outdoor energy storage device is the same as described in the foregoing embodiments. Since the outdoor energy storage device adopts all the technical solutions of all the foregoing embodiments, it has at least all the technical effects brought about by the technical solutions of the foregoing embodiments, and will not be described in detail here. In this embodiment, by using a parallel control strategy based on voltage difference monitoring, the safety hazards caused by parallel connection of outdoor energy storage devices with different SOCs are avoided, enabling the system to achieve safe and stable parallel operation even when the SOC difference between the master and slave batteries is very large.

[0113] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A control circuit for an outdoor energy storage device, characterized by, The control circuit of the outdoor energy storage device includes: A charge-discharge control unit, comprising a first connection terminal and a second connection terminal, wherein the first connection terminal is used for electrically connecting to an electrical device and the second connection terminal is used for electrically connecting to a storage battery; The parallel operation control module includes a third connection terminal and a fourth connection terminal. The third connection terminal is electrically connected to the first connection terminal, and the fourth connection terminal is used to electrically connect to another outdoor energy storage device. The parallel operation control module can control the connection between the third connection terminal and the fourth connection terminal to be turned on or off. A monitoring module is electrically connected to the second connection terminal and the fourth connection terminal respectively. The monitoring module is used to acquire the voltage of the second connection terminal to generate a first voltage value, and to acquire the voltage of the fourth connection terminal to generate a second voltage value. The main control module is electrically connected to the charge / discharge control unit, the parallel operation control module, and the monitoring module. The main control module is configured to compare a first voltage value and a second voltage value obtained by the monitoring module, and control at least one of the parallel operation control module and the charge / discharge control unit to operate based on the comparison result.

2. The control circuit of the outdoor energy storage device according to claim 1, characterized in that, The parallel operation control module includes: A first control module, the first control module includes a first trigger terminal and a first output terminal, the first trigger terminal being electrically connected to the main control module; A switch module, wherein the switch module is electrically connected to the third connection terminal, the fourth connection terminal and the first output terminal respectively; The first control module is used to process the control signal received by the main control module from the first trigger terminal and output a level signal through the first output terminal; the switch module operates based on the level signal of the first output terminal to turn on or off the electrical connection between the third connection terminal and the fourth connection terminal.

3. The control circuit of the outdoor energy storage device according to claim 2, characterized in that, The first control module includes: A first optocoupler, comprising a first pin, a second pin, a third pin, and a fourth pin, wherein the first pin and the third pin are electrically connected to a power supply; The first switching transistor has its second pin grounded via the first switching transistor, and the control terminal of the first switching transistor is electrically connected to the first trigger terminal. The first transistor has its collector electrically connected to the power supply, its emitter connected to the first output terminal, and its base electrically connected to the fourth pin.

4. The control circuit of the outdoor energy storage device according to claim 2, characterized in that, The switching module includes at least one second switching transistor, the gate of which is electrically connected to the first output terminal, the source of which is electrically connected to the fourth connection terminal, and the drain of which is electrically connected to the third connection terminal.

5. The control circuit of the outdoor energy storage device according to any one of claims 1 to 4, characterized in that, The number of parallel control modules is set to multiple, and the fourth connection terminal of each of the multiple parallel control modules is used to connect to different outdoor energy storage devices.

6. The control circuit of the outdoor energy storage device according to any one of claims 1 to 4, characterized in that, The monitoring module includes: The host voltage monitoring module includes a first monitoring terminal and a first feedback terminal. The first monitoring terminal is electrically connected to the second connection terminal, and the first feedback terminal is connected to the main control module.

7. The control circuit of the outdoor energy storage device according to claim 6, characterized in that, The monitoring module also includes: The slave voltage monitoring module includes a second monitoring terminal and a second feedback terminal. The second monitoring terminal is electrically connected to the fourth connection terminal, and the second feedback terminal is connected to the master control module.

8. The control circuit of the outdoor energy storage device according to claim 1, characterized in that, The charging and discharging control unit includes a first control unit and a charging control unit. The first control unit includes a first control terminal, a first conduction terminal and a second conduction terminal. The first conduction terminal is electrically connected to the battery, and the second conduction terminal is electrically connected to the first connection terminal. The charging control unit includes: The second optocoupler includes a fifth pin, a sixth pin, a seventh pin, and an eighth pin, wherein the fifth pin and the seventh pin are electrically connected to a power supply. The collector of the second transistor is electrically connected to the power supply, the base is electrically connected to the other eighth pin, and the emitter is electrically connected to the first control terminal. The third switch transistor is connected to the main control module via the sixth pin, and the control terminal of the third switch transistor is electrically connected to the main control module.

9. The control circuit of the outdoor energy storage device according to claim 8, characterized in that, The charge / discharge control unit further includes a second control unit and a discharge control unit; The second control unit includes a second control terminal, a third conduction terminal, and a fourth conduction terminal. The third conduction terminal is electrically connected to the second connection terminal, and the fourth conduction terminal is electrically connected to the first conduction terminal. The discharge control unit includes: The third optocoupler includes a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, and a thirteenth pin. The ninth pin and the eleventh pin are electrically connected to the power supply, the twelfth pin is electrically connected to the second control terminal, and the thirteenth pin is electrically connected to the base of the second transistor. The fourth switch is connected to the main control module via the tenth pin.

10. An outdoor energy storage device, characterized in that, Includes a battery and a control circuit for an outdoor energy storage device as described in any one of claims 1 to 9.

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