Charging tool of energy storage system and energy storage charging system

Abstract

The utility model discloses a charging tool of an energy storage system and an energy storage charging system, and relates to the technical field of energy storage. The electricity supplementing tool comprises a mechanical adjusting structure, an adjusting module and a power conversion module, and the mechanical adjusting structure is used for a user to set target electrical parameters; the adjusting module is connected with the mechanical adjusting structure and is used for generating and outputting a modulation signal according to the target electrical parameter; the power conversion module is connected with the adjusting module, a first interface of the power conversion module is connected with the alternating current side of the energy storage system, a second interface of the power conversion module is connected with the direct current side of the energy storage system, and the power conversion module is used for receiving the modulation signal and supplementing electricity for the energy storage system based on the modulation signal. Therefore, the operation of the charging tool is simplified.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a power supply tooling and energy storage charging system for an energy storage system. Background Art

[0002] An energy storage system refers to a system that stores energy in the form of electricity, etc., through different media and releases the energy when needed.

[0003] However, in actual application, if the energy storage system is idle for a long time or has a fault, it will be out of power. Therefore, the energy storage system needs to be recharged. The existing recharge devices have poor hardware design and connection convenience, and the operation is complicated, which is not conducive to user on-site application. Summary of the invention

[0004] The main purpose of the present application is to provide a power replenishment tool and an energy storage charging system for an energy storage system to simplify the operation of the power replenishment tool.

[0005] To achieve the above objectives, the present application provides a power supply device for an energy storage system, comprising:

[0006] A mechanical adjustment structure for users to set target electrical parameters;

[0007] an adjustment module, connected to the mechanical adjustment structure, and configured to generate and output a modulation signal according to the target electrical parameter;

[0008] A power conversion module is connected to the regulation module, and a first interface of the power conversion module is connected to the AC side of the energy storage system, and a second interface of the power conversion module is connected to the DC side of the energy storage system. The power conversion module is used to receive the modulation signal and replenish power for the energy storage system based on the modulation signal.

[0009] Optionally, the mechanical adjustment structure includes a voltage adjustment knob and a current adjustment knob, the adjustment module includes a voltage encoder and a current encoder, the target electrical parameters include a target voltage value and a target current value, and the modulation signal includes a voltage modulation signal and a current modulation signal; the voltage adjustment knob is connected to the voltage encoder, and the voltage adjustment knob is used for the user to set the target voltage value, and the voltage encoder is used to generate and output the voltage modulation signal according to the target voltage value; the current adjustment knob is connected to the current encoder, and the current adjustment knob is used for the user to set the target current value, and the current encoder is used to generate and output the current modulation signal according to the target current value.

[0010] Optionally, the power conversion module includes a first voltage decoder, a first current decoder and a power replenishment control circuit; the first voltage decoder is connected to the voltage encoder, and the first voltage decoder is used to receive the voltage modulation signal and obtain the target voltage value according to the voltage modulation signal; the first current decoder is connected to the current encoder, and the first current decoder is used to receive the current modulation signal and obtain the target current value according to the current modulation signal; the power replenishment control circuit is respectively connected to the first voltage decoder and the first current decoder, and is used to detect the output voltage value and the output current value at the second interface, and perform power replenishment according to the comparison result of the output voltage value and the target voltage value and / or the comparison result of the output current value and the target current value.

[0011] Optionally, the power compensation control circuit includes a voltage control unit and a current control unit; one end of the voltage control unit is connected to the first voltage decoder, the other end of the voltage control unit is connected to one end of the current control unit, and the other end of the current control unit is connected to the second interface.

[0012] Optionally, the voltage control unit includes a first voltage detector, a second voltage detector, a first branch and a second branch; one end of the first voltage detector and the second voltage detector is connected between the current control unit and the second interface, the other end of the first voltage detector is connected to the first branch, and the other end of the second voltage detector is connected to the second branch; the input ends of the first branch and the second branch are connected to the first voltage decoder, and the output ends of the first branch and the second branch are connected to the current control unit; when the first voltage detector and the second voltage detector detect that the output voltage value is greater than or equal to a preset voltage, the first branch and the second branch are controlled to jointly regulate the voltage; when the first voltage detector and the second voltage detector detect that the output voltage value is less than the preset voltage, either the first branch or the second branch is controlled to regulate the voltage.

[0013] Optionally, the first branch includes a first comparator, a second comparator and a first controller, and the second branch includes a third comparator and a second controller; the first input end of the first comparator is connected to the first voltage decoder, the second input end of the first comparator is connected to the first voltage detector, and the output end of the first comparator is connected to the input end of the first controller; the output end of the first controller is connected to the first input end of the second comparator, the second input end of the second comparator is connected to the output end of the second controller, and the output end of the second comparator is connected to the current control unit; the first input end of the third comparator is connected to the first voltage decoder, the second input end of the third comparator is connected to the second voltage detector, and the output end of the third comparator is connected to the input end of the second controller; the first voltage detector and the second voltage detector are used to detect the output voltage value at the second interface, the first comparator is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the third comparator is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the first controller is used to regulate the voltage according to the comparison result output by the first comparator, and the second controller is used to regulate the voltage according to the comparison result output by the third comparator.

[0014] Optionally, the current control unit includes a current detector, a fourth comparator, a third controller, a chip and a PWM modulator; one end of the current detector is connected between the current control unit and the second interface, the other end of the current detector is connected to the second input end of the fourth comparator, the first input end of the fourth comparator receives the comparison current, and the output end of the fourth comparator is connected to the input end of the third controller; wherein the comparison current is the minimum current between the current value output by the voltage control unit after regulation and the target current value; the output end of the third controller is connected to the input end of the chip, the output end of the chip is connected to the input end of the PWM modulator, and the output end of the PWM modulator is connected to the second interface; the current detector is used to detect the output current value at the second interface and output the output current value to the fourth comparator; the fourth comparator is used to receive the comparison current and the output current value, and compare the comparison current and the output current value; the third controller is used to regulate the current according to the comparison result output by the fourth comparator.

[0015] Optionally, the power supply tooling further includes a first external interface, a second external interface and a display module; the first interface of the power conversion module is connected to the AC side of the energy storage system through the first external interface, and the second interface of the power conversion module is connected to the DC side of the energy storage system through the second external interface; the display module includes a voltage sampling unit, a current sampling unit, a second voltage decoder, a second current decoder and a display; one end of the second voltage decoder is connected to the voltage encoder, and the other end of the second voltage decoder is connected to the display, and the second voltage decoder is used to receive the voltage modulation signal and obtain the target voltage value according to the voltage modulation signal; one end of the second current decoder is connected to the current encoder, and the second current decoder is connected to the current encoder. The other end of the stream decoder is connected to the display, and the second current decoder is used to receive the current modulation signal and obtain the target current value according to the current modulation signal; one end of the voltage sampling unit and the current sampling unit are connected between the second interface and the second external interface, and the other end of the voltage sampling unit and the current sampling unit are connected to the display; the voltage sampling unit is used to collect the actual output voltage value of the second interface, and the current sampling unit is used to collect the actual output current value of the second interface; the display is used to display the target voltage value, the target current value, the actual output voltage value or the actual output current value; wherein, the first external interface and the second external interface are connected to the energy storage system through alligator clips.

[0016] Optionally, the power compensation tooling also includes a switch, the power conversion module also includes a third interface, and the display module also includes a display switching unit; the first normally open node of the switch is connected to the third interface, the second normally open node of the switch is connected to one end of the display switching unit, and the other end of the display switching unit is connected to the display; when the switch is disconnected, the display switching unit controls the display to display the target voltage value and the target current value; when the switch is closed, the display switching unit controls the display to display the target voltage value, the target current value, the actual output voltage value, and the actual output current value.

[0017] In addition, to achieve the above-mentioned purpose, the present application also provides an energy storage charging system, including any one of the above-mentioned power replenishment tools and energy storage devices; the power replenishment tool is connected to the energy storage device, and the power replenishment tool is used to replenish power for the energy storage device.

[0018] In the power replenishment tooling of the energy storage system of the present application, the user sets the target electrical parameters through a mechanical adjustment structure, and the adjustment module generates and outputs a modulation signal according to the target electrical parameters; the power conversion module adjusts the electrical parameters currently output by the energy storage system to the target electrical parameters set by the user based on the modulation signal to achieve power replenishment. The user only needs to control the mechanical adjustment structure to achieve the power replenishment operation, thereby simplifying the operation of the power replenishment tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an example of a scenario of a power supply tool in an embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of a power supply tooling of an energy storage system according to an embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the composition of the power supply tooling of the energy storage system of the embodiment of the present application;

[0022] Figure 4 is a circuit diagram of a power replenishment control circuit according to an embodiment of the present application;

[0023] In the figure, 100, energy storage system; 110, energy storage battery; 200, power supply tooling; 210, mechanical adjustment structure; 211, voltage adjustment knob; 212, current adjustment knob; 220, adjustment module; 221, voltage encoder; 222, current encoder; 230, power conversion module; 231, first voltage decoder; 232, first current decoder; 233, power supply control circuit; 240, first external interface; 250, second external interface; 260, display module; 261, voltage sampling unit; 262, current sampling unit; 263, second voltage decoder; 264, second current decoder; 265, display; 266, display switching unit; 270, switch; 300, power grid; 410, voltage control unit; 411, voltage detector; 412, second voltage detector; 413, first branch; 414, second branch; 420, current control unit; 421, current detector.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Energy storage system refers to a system that stores energy in the form of electricity through different media and releases the energy when needed. Therefore, the energy storage system can realize the controllable transfer of energy in time. It is precisely because of this characteristic of the energy storage system that the energy storage system is often used to solve the problems caused by overload or overvoltage in the distribution station area.

[0027] As we all know, there are obvious seasonal characteristics of overload and voltage problems in distribution stations. For example, overload usually occurs in July and August, and there is almost no overload at other times. In this scenario, on the one hand, the energy storage system may be idle for a long time, resulting in power shortage due to self-consumption; on the other hand, the energy storage system may also suffer from power shortage due to faults; therefore, the energy storage system needs to be recharged when it is working.

[0028] At present, the existing power supply devices are usually connected to the energy storage system by means of screw connection, crimping connection, etc. When the power supply device needs to be connected to the energy storage system, the wire needs to be connected to the power supply device or the energy storage system by screws, etc., and the connection convenience is poor. In addition, the existing power supply devices are complicated to operate, which is not conducive to on-site application by users.

[0029] To this end, an embodiment of the present application provides a power replenishment device and an energy storage charging system for an energy storage system to simplify the connection and operation of the power replenishment device and the energy storage system.

[0030] For ease of understanding, this specification provides an example scenario of a power supply tool. The example scenario is applied in Figure 1 In the application environment shown, an energy storage system 100 , a power supply device 200 and a power grid 300 are included, and the energy storage system 100 may include an energy storage battery 110 .

[0031] It is understandable that the output of the power grid 300 is usually AC power, while the output of the energy storage battery 110 is DC power. Therefore, when power is transmitted between the power grid 300 and the energy storage system 100, an AC / DC power conversion device is required to convert AC power or DC power. The power supply tool 200 of the present application also has an AC / DC conversion function. When the energy storage system 100 is out of power, the power supply tool 200 of the present application can be used to replace the AC / DC power conversion device to achieve power supply and AC / DC conversion functions.

[0032] In this scenario example, the power supply tool 200 may include an AC external interface, a DC external interface, a voltage adjustment knob, a current adjustment knob, a power conversion module, and a display. Among them, the AC external interface can be quickly connected to the power grid 300 using three 1P crocodile clips, and the DC external interface can be quickly connected to the energy storage battery 110 using two 1P crocodile clips; the user can set the target voltage value and target current value through the voltage adjustment knob and the current adjustment knob; the power conversion module can convert the AC power input from the power grid 300 into DC power and output it to the energy storage battery 110, and can supplement the AC power input from the power grid 300 according to the target voltage value and target current value set by the user, so that the voltage and current of the DC power output after conversion by the power conversion module reach the target voltage value and target current value set by the user.

[0033] In addition, the display of the power supply tool 200 can display the target voltage value and target current value set by the user, and can also display the actual voltage value and actual current value of the direct current output by the power conversion module. The user can check through the display whether the actual voltage value and actual current value are the set target voltage value and target current value. If not, the user can further adjust the direct current output of the power conversion module by controlling the voltage adjustment knob or the current adjustment knob.

[0034] With reference to the scenario examples of the power replenishment tooling in the aforementioned embodiments, the power replenishment tooling of the energy storage system in the embodiments of the present application is described in detail below.

[0035] Figure 2 It is a structural schematic diagram of the power replenishment tooling of the energy storage system of an embodiment of the present application.

[0036] like Figure 2 As shown, the power supply tooling 200 may include a mechanical adjustment structure 210, an adjustment module 220 and a power conversion module 230; wherein the mechanical adjustment structure 210 is used for the user to set the target electrical parameters; the adjustment module 220 is connected to the mechanical adjustment structure 210, and is used to generate and output a modulation signal according to the target electrical parameters; the power conversion module 230 is connected to the adjustment module 220, and the first interface of the power conversion module 230 is connected to the AC side of the energy storage system 100, and the second interface of the power conversion module 230 is connected to the DC side of the energy storage system 100, and the power conversion module 230 is used to receive the modulation signal and provide power supply to the energy storage system 100 based on the modulation signal.

[0037] First, it should be noted that the first interface of the power conversion module 230 may be an AC interface, and the second interface may be a DC interface; in addition, the AC side of the energy storage system 100 may be a power grid 300, or any charging device capable of outputting AC power, and the DC side of the energy storage system 100 may be an energy storage battery 110 in the energy storage system 100.

[0038] In this embodiment, the user can control the electrical parameters of the DC power output from the second interface of the power conversion module 230 by controlling the mechanical adjustment structure 210 according to the needs of the energy storage system 100. Here, the electrical parameters can be voltage, current, etc. Specifically, the user sets the target electrical parameters by controlling the mechanical adjustment structure 210; the adjustment module 220 can generate a modulation signal according to the target electrical parameters set by the user, and the adjustment module 220 outputs the modulation signal to the power conversion module 230; the power conversion module 230 then determines the target electrical parameters according to the modulation signal, and the power conversion module 230 detects the actual electrical parameters at the second interface in real time, and by comparing the actual electrical parameters with the target electrical parameters, the DC power output by the power conversion module 230 is adjusted according to the comparison result to achieve the purpose of power replenishment.

[0039] Figure 3 It is a schematic diagram of the structure of the power supply tool 200 of the energy storage system 100 according to an embodiment of the present application.

[0040] like Figure 2 and Figure 3 As shown, in some embodiments, the mechanical adjustment structure 210 includes a voltage adjustment knob 211 and a current adjustment knob 212, the adjustment module 220 includes a voltage encoder 221 and a current encoder 222, the target electrical parameters include a target voltage value and a target current value, and the modulation signal includes a voltage modulation signal and a current modulation signal.

[0041] Among them, the voltage adjustment knob 211 is connected to the voltage encoder 221, the voltage adjustment knob 211 is used for the user to set the target voltage value, and the voltage encoder 221 is used to generate and output a voltage modulation signal according to the target voltage value; the current adjustment knob 212 is connected to the current encoder 222, the current adjustment knob 212 is used for the user to set the target current value, and the current encoder 222 is used to generate and output a current modulation signal according to the target current value.

[0042] In this embodiment, the user can adjust the voltage of the DC power output from the second interface of the power conversion module 230 through the voltage adjustment knob 211. Specifically, multiple gears can be set for the voltage adjustment knob 211, and the change value of each voltage can be set. The user can directly set the voltage change value of the DC power output from the second interface of the power conversion module 230 by adjusting the gear of the voltage adjustment knob 211. For example, 11 gears can be set for the voltage adjustment knob 211. If the voltage range of the DC power output from the second interface of the power conversion module 230 is set to 500V to 1000V, then each gear changes the voltage by 50V.

[0043] Similarly, the user can adjust the current of the direct current output from the second interface of the power conversion module 230 through the current adjustment knob 212. Specifically, multiple gears can be set for the current adjustment knob 212, and the change value of each gear current can be set. The user can directly set the change value of the current of the direct current output from the second interface of the power conversion module 230 by adjusting the gear of the current adjustment knob 212. For example, 5 gears can be set for the current adjustment knob 212. If the current range of the direct current output from the second interface of the power conversion module 230 is set to 0A to 40A, then each gear changes the current by 10A.

[0044] In this embodiment, the voltage adjustment knob 211 and the current adjustment knob 212 can both be mechanical knobs available on the market, and the mechanical knobs can convert changes in their physical positions into electrical signals; further, the voltage encoder 221 and the current encoder 222 can be a variable resistor, the voltage encoder 221 is connected to the voltage adjustment knob 211, and the current encoder 222 is connected to the current adjustment knob 212.

[0045] When the voltage adjustment knob 211 is rotated, the voltage adjustment knob 211 will convert the mechanical signal after the rotation into an electrical signal. The output electrical signal will change the resistance value of the variable resistor. The electrical signal after the resistance value is changed is the voltage modulation signal described in this embodiment.

[0046] Similarly, when the current adjustment knob 212 is rotated, the current adjustment knob 212 will convert the mechanical signal after the rotation into an electrical signal. The output electrical signal will change the resistance value of the variable resistor. The electrical signal after the resistance value is changed is the current modulation signal described in this embodiment.

[0047] Continue to refer Figure 2 In some implementations, the power conversion module 230 includes a first voltage decoder 231 , a first current decoder 232 , and a power compensation control circuit 233 .

[0048] Among them, the first voltage decoder 231 is connected to the voltage encoder 221, and the first voltage decoder 231 is used to receive the voltage modulation signal and obtain the target voltage value according to the voltage modulation signal; the first current decoder 232 is connected to the current encoder 222, and the first current decoder 232 is used to receive the current modulation signal and obtain the target current value according to the current modulation signal; the supplementary power control circuit 233 is respectively connected to the first voltage decoder 231 and the first current decoder 232, and is used to detect the output voltage value and the output current value at the second interface, and perform supplementary power according to the comparison result of the output voltage value and the target voltage value and / or the comparison result of the output current value and the target current value.

[0049] It should be noted that all decoders mentioned in the embodiments of the present application can use signal decoders available on the market, and the decoders are not specifically limited here.

[0050] Specifically, the first voltage decoder 231 receives the voltage modulation signal sent by the voltage encoder 221, and obtains the target voltage value set by the user by analyzing the voltage modulation signal; similarly, the first current decoder 232 receives the current modulation signal sent by the current encoder 222, and obtains the target current value set by the user by analyzing the current modulation signal. Further, the first voltage decoder 231 and the first current decoder 232 respectively output the obtained target voltage value and target current value to the power replenishment control circuit 233, and the power replenishment control circuit 233 collects the output voltage value and output current value at the second interface of the power conversion module 230, and compares the output voltage value with the target voltage value, and compares the output current value with the target current value to determine whether the current output DC meets the user's needs; if not, the power replenishment control circuit 233 adjusts or replenishes the output DC.

[0051] It should be noted that the process in which the decoder parses the modulated signal to obtain the required data can refer to the parsing process of the existing decoder, which will not be repeated here.

[0052] Figure 4 is a circuit diagram of a power replenishment control circuit according to an embodiment of the present application.

[0053] like Figure 2 and Figure 4 As shown, in some embodiments, the power replenishment control circuit 233 includes a voltage control unit 410 and a current control unit 420. One end of the voltage control unit 410 is connected to the first voltage decoder 231, the other end of the voltage control unit 410 is connected to one end of the current control unit 420, and the other end of the current control unit 420 is connected to the second interface.

[0054] In this embodiment, the power conversion module 230 can adopt the structure of an isolated AC / DC converter, and add a first voltage decoder 231 and a first current decoder 232 to the structure of the isolated AC / DC converter. It can be understood that the isolated AC / DC converter mainly adopts a DC voltage outer loop and a current control inner loop design, wherein the DC voltage outer loop adopts half-voltage control to achieve a higher voltage range output capability. The structure of the voltage control unit 410 described in the embodiment of the present application is similar to the structure of the DC voltage outer loop, and the structure of the current control unit 420 is similar to the structure of the current control inner loop.

[0055] Specifically, the voltage control unit 410 is the main control loop, which is responsible for adjusting the output voltage of the power conversion module 230 to maintain it at the set target voltage value. In order to achieve a wider voltage output range, a half-voltage control technology can be used, which means that in some cases, the power conversion module 230 can output a voltage exceeding half of the rated voltage to meet the needs of different loads, thereby improving the flexibility and adaptability of the power conversion module 230.

[0056] The current control unit 420 is a fast-response secondary loop used to directly control the current passing through the power conversion module; the current control unit 420 receives a reference current value, where the reference current value can be the current value output by the voltage control unit 410 or the target current value output by the first current decoder 232; the current control unit 420 adjusts according to the difference between the actual current value at the second interface and the reference current value to ensure current stability.

[0057] Continue to refer Figure 4 In some implementations, the voltage control unit 410 includes a first voltage detector 411 , a second voltage detector 412 , a first branch 413 , and a second branch 414 .

[0058] Among them, one end of the first voltage detector 411 and the second voltage detector 412 is connected between the current control unit 420 and the second interface, the other end of the first voltage detector 411 is connected to the first branch 413, and the other end of the second voltage detector 412 is connected to the second branch 414; the input ends of the first branch 413 and the second branch 414 are connected to the first voltage decoder 231, and the output ends of the first branch 413 and the second branch 414 are connected to the current control unit 420.

[0059] When the first voltage detector 411 and the second voltage detector 412 detect that the output voltage value is greater than or equal to the preset voltage, the first branch 413 and the second branch 414 are controlled to jointly regulate the voltage; when the first voltage detector 411 and the second voltage detector 412 detect that the output voltage value is less than the preset voltage, either the first branch 413 or the second branch 414 is controlled to regulate the voltage.

[0060] It should be noted that the first voltage detector 411 and the second voltage detector 412 can adopt voltage detectors available on the market that can be designed into the circuit. For example, a voltage divider resistor network can be used as a voltage detector. By using voltage divider resistors, the high voltage can be reduced to a safe and detectable level, and then detected using a comparator or ADC (analog-to-digital converter).

[0061] In this embodiment, two-way voltage comparison is used to adjust the output voltage. Specifically, the first voltage detector 411 can be used to detect the output positive voltage, and the second voltage detector 412 can be used to detect the output negative voltage; one end of the first voltage detector 411 and the second voltage detector 412 can be connected to the second interface to collect the current output voltage at the second interface; the other end of the first voltage detector 411 is connected to the first branch 413, and the other end of the second voltage detector 412 is connected to the second branch 414, so as to compare the collected output voltage with the target voltage value. The output ends of the first branch 413 and the second branch 414 are connected to the current control unit 420 to provide the current control unit 420 with the current value after voltage adjustment.

[0062] When the first voltage detector 411 and the second voltage detector 412 detect that the output voltage at the second interface is greater than or equal to the preset voltage, the first branch 413 and the second branch 414 can be controlled to jointly regulate the voltage. As an example, if the preset voltage is 500V, and the first voltage detector 411 and the second voltage detector 412 detect that the output voltage at the second interface is 580V, the first branch 413 and the second branch 414 can be used to regulate half of the voltage 290V respectively. Similarly, when comparing the output voltage with the target voltage value, the target voltage value is also compared with half of the voltage.

[0063] When the first voltage detector 411 and the second voltage detector 412 detect that the output voltage at the second interface is less than the preset voltage, either the first branch 413 or the second branch 414 can be selected to regulate the voltage. As an example, if the preset voltage is 500V, and the first voltage detector 411 and the second voltage detector 412 detect that the output voltage at the second interface is 400V, the first branch 413 can be selected to regulate the voltage.

[0064] It is understandable that, due to the limited working level of some components in the power-replenishing control circuit 233, the maximum output voltage of the power-replenishing control circuit 233 is 500V. If a voltage higher than 500V needs to be regulated, single-channel regulation cannot be achieved. Based on this, the voltage control unit 410 in the embodiment of the present application is designed with two parallel channels to achieve regulation of voltages higher than 500V. When the voltage to be regulated is lower than 500V, it can be regulated by one circuit alone, or two circuits can be output in parallel.

[0065] Continue to refer Figure 4 In some implementations, the first branch 413 includes a first comparator A1, a second comparator A2, and a first controller U1, and the second branch 414 includes a third comparator A3 and a second controller U2.

[0066] Among them, the first input end of the first comparator A1 is connected to the first voltage decoder 231, the second input end of the first comparator A1 is connected to the first voltage detector 411, and the output end of the first comparator A1 is connected to the input end of the first controller U1; the output end of the first controller U1 is connected to the first input end of the second comparator A2, the second input end of the second comparator A2 is connected to the output end of the second controller U2, and the output end of the second comparator A2 is connected to the current control unit 420; the first input end of the third comparator A3 is connected to the first voltage decoder 231, the second input end of the third comparator A3 is connected to the second voltage detector 412, and the output end of the third comparator A3 is connected to the input end of the second controller U2. It should be noted that the first voltage decoder 231 is connected to the first voltage decoder 231 through Figure 4 The UDC+_ref pin and the UDC-_ref pin in are connected to the first comparator A1 and the third comparator A3.

[0067] The first voltage detector 411 and the second voltage detector 412 are used to detect the output voltage value at the second interface, the first comparator A1 is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the third comparator A3 is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the first controller U1 is used to regulate the voltage according to the comparison result output by the first comparator A1, and the second controller U2 is used to regulate the voltage according to the comparison result output by the third comparator A3.

[0068] It should be noted that all controllers described in the embodiments of the present application may adopt a PI (Proportional-Integral) controller, which is a proportional-integral controller. The following takes the PI controller as an example to introduce the power compensation control circuit 233.

[0069] Taking two-way voltage control as an example, the first comparator A1 receives half of the target voltage value and half of the output voltage value. The first comparator A1 compares half of the target voltage value with half of the output voltage value. If half of the target voltage value is greater than half of the output voltage value, the first controller U1 increases the voltage. If half of the target voltage value is less than half of the output voltage value, the first controller U1 reduces the voltage so that the output voltage value reaches the target voltage value.

[0070] Similarly, the third comparator A3 compares half of the target voltage value with half of the output voltage value. If half of the target voltage value is greater than half of the output voltage value, the second controller U2 increases the voltage. If half of the target voltage value is less than half of the output voltage value, the second controller U2 reduces the voltage to make the output voltage reach the target voltage value. The second comparator A2 can compare the voltage regulated by the first controller U1 with the voltage regulated by the second controller U2 again. Finally, the output end of the second comparator A2 outputs the regulated current signal.

[0071] Continue to refer Figure 4 In some implementations, the current control unit 420 includes a current detector 421, a fourth comparator A4, a third controller U3, a chip U4, and a PWM modulator U5.

[0072] Among them, one end of the current detector 421 is connected between the current control unit 420 and the second interface, the other end of the current detector 421 is connected to the second input end of the fourth comparator A4, the first input end of the fourth comparator A4 receives the comparison current, and the output end of the fourth comparator A4 is connected to the input end of the third controller U3; wherein the comparison current is the minimum current between the current value (lref_mod) output by the voltage control unit 410 after regulation and the target current value (lref_rating). The output end of the third controller U3 is connected to the input end of the chip U4, the output end of the chip U4 is connected to the input end of the PWM modulator U5, and the output end of the PWM modulator U5 is connected to the second interface.

[0073] The current detector 421 is used to detect the output current value at the second interface and output the output current value to the fourth comparator A4; the fourth comparator A4 is used to receive the comparison current and the output current value, and compare the comparison current and the output current value; the third controller U3 is used to regulate the current according to the comparison result output by the fourth comparator A4.

[0074] It should be noted that the chip U4 may be a DQ-ABC function conversion chip. In addition, the current detector 421 may be a current detector 421 currently available on the market, such as a shunt, an integrated current sensor, and the like.

[0075] Specifically, the current output by the voltage control unit 410 is first compared with the target current value output by the first current decoder 232, and the minimum current value (i.e., the comparison current) is input to the first input terminal of the fourth comparator A4. The second input terminal of the fourth comparator A4 receives the output current value of the second interface detected by the current detector 421, and compares the comparison current with the output current value of the second interface to obtain an error signal through analysis. The error signal is fed to the third controller U3. The third controller U3 determines a control signal based on the error signal, which is proportional to the error and takes into account the historical accumulation of the error (integral term) to eliminate the steady-state error.

[0076] The third controller U3 outputs the control signal to the chip U4, which can be used as a modulated carrier signal; the chip U4 controls the PWM modulator U5 to generate a pulse width modulation (PWM) signal based on the control signal. This PWM signal will control the on and off time of the power switch 270 element (such as IGBT or MOSFET), thereby directly affecting the output current of the power conversion module 230.

[0077] It is understandable that the output of the current control unit 420 will affect the output current at the second interface. This process is a closed loop, which means that the power compensation control circuit 233 will continue to adjust until the error between the output value and the target value is minimized.

[0078] The final expression of the power conversion module 230 can be: when the current value output by the voltage control unit 410 is less than the target current value, the power conversion module 230 is in a DC constant voltage mode; when the current value output by the voltage control unit 410 is greater than the target current value, the current is limited to the target current value, and the power conversion module 230 is in a DC constant current mode.

[0079] It should be noted that the first comparator A1 to the fourth comparator A4, the current comparison process and the DQ-ABC functional conversion can be integrated into the DSP chip in the power conversion module 230 and implemented as a functional algorithm of the DSP chip.

[0080] like Figure 2 and Figure 3 As shown, in some embodiments, the charging tool 200 may further include a first external interface 240 , a second external interface 250 , and a display module 260 .

[0081] The first interface of the power conversion module 230 is connected to the AC side of the energy storage system 100 through the first external interface 240 , and the second interface of the power conversion module 230 is connected to the DC side of the energy storage system 100 through the second external interface 250 .

[0082] The display module 260 includes a voltage sampling unit 261, a current sampling unit 262, a second voltage decoder 263, a second current decoder 264 and a display 265. One end of the second voltage decoder 263 is connected to the voltage encoder 221, and the other end of the second voltage decoder 263 is connected to the display 265. The second voltage decoder 263 is used to receive a voltage modulation signal and obtain a target voltage value according to the voltage modulation signal; one end of the second current decoder 264 is connected to the current encoder 222, and the other end of the second current decoder 264 is connected to the display 265. The second current decoder 264 is used to receive a current modulation signal and obtain a target current value according to the current modulation signal.

[0083] One end of the voltage sampling unit 261 and the current sampling unit 262 are connected between the second interface and the second external interface 250, and the other end of the voltage sampling unit 261 and the current sampling unit 262 are connected to the display 265; the voltage sampling unit 261 is used to collect the actual output voltage value of the second interface, and the current sampling unit 262 is used to collect the actual output current value of the second interface; the display 265 is used to display the target voltage value, the target current value, the actual output voltage value or the actual output current value.

[0084] In this embodiment, the power supply tool 200 includes a first external interface 240 and a second external interface 250, wherein the first external interface 240 may be an AC interface, one end of the first external interface 240 is connected to the first interface of the power conversion module 230, and the other end of the first external interface 240 may be connected to the AC side of the energy storage system 100 through a wire and an alligator clip, and the AC side of the energy storage system 100 described here may be the power grid 300. Similarly, the second external interface 250 may be a DC interface, one end of the second external interface 250 is connected to the second interface of the power conversion module 230, and the other end of the second external interface 250 may be connected to the DC side of the energy storage system 100 through a wire and an alligator clip, and the DC side of the energy storage system 100 described here may be the energy storage battery 110.

[0085] It should be noted that the voltage sampling unit 261 in the display module 260 can be a voltage sampler available on the market, such as a voltage divider resistor network, a non-contact voltage detector circuit, etc.; the circuit sampling unit can also be a current sampler available on the market, such as a shunt resistor, a Hall effect sensor, a current transformer, etc., and the voltage sampling unit 261 and the current sampling unit 262 are not specifically limited here.

[0086] The voltage sampling unit 261 and the current sampling unit 262 respectively collect the actual output voltage and the actual output current between the second interface and the second external interface 250, and output the actual output voltage and the actual output current to the display 265, so that the display 265 displays the actual output voltage and the actual output current for the user to view.

[0087] Furthermore, the display module 260 also includes a second voltage decoder 263 and a second current decoder 264. The second voltage decoder 263 is connected to the voltage encoder 221, and is used to receive a voltage modulation signal, and parse the voltage modulation signal to obtain a target voltage value; the second current decoder 264 is connected to the current encoder 222, and is used to receive a current modulation signal, and parse the current modulation signal to obtain a target current value. The working process of the second voltage decoder 263 and the second current decoder 264 can refer to the working process of the first voltage decoder 231 and the first current decoder 232, and will not be repeated here.

[0088] The second voltage decoder 263 and the second current decoder 264 output the obtained target voltage value and target current value to the display 265 , so that the display 265 displays the target voltage value and the target current value for the user to view.

[0089] like Figure 2 and Figure 3 As shown, in some embodiments, the power supply tool 200 may further include a switch 270 , the power conversion module 230 may further include a third interface, and the display module 260 may further include a display switching unit 266 .

[0090] The first normally open node of switch 270 is connected to the third interface, the second normally open node of switch 270 is connected to one end of the display switching unit 266, and the other end of the display switching unit 266 is connected to the display 265; when the switch 270 is disconnected, the display switching unit 266 controls the display 265 to display the target voltage value and the target current value; when the switch 270 is closed, the display switching unit 266 controls the display 265 to display the target voltage value, the target current value, the actual output voltage value and the actual output current value.

[0091] It should be noted that the third interface of the power conversion module 230 may be a start / stop interface, which is an interface for controlling the power conversion module 230 to start or shut down.

[0092] In this embodiment, the switch 270 may also be a mechanical knob, wherein the first normally open node of the switch 270 is connected to the third interface of the power conversion module 230 , and the second normally open node of the switch 270 is connected to the display switching unit 266 of the display 265 .

[0093] When the switch 270 is disconnected, the power conversion module 230 is shut down, and the display switching unit 266 controls the display 265 to display the target voltage value and the target current value set by the user. When the switch 270 is closed, the power conversion module 230 is turned on and the display switching unit 266 controls the display 265 to display the actual output voltage value, the actual output current value, the target voltage value, and the target current value of the second external interface 250. The user can judge whether it is necessary to continue to adjust the voltage and current by comparing the actual output voltage value with the target voltage value and comparing the actual output current value with the target current value.

[0094] In some embodiments, the first external interface 240 and the second external interface 250 are connected to the energy storage system 100 via crocodile clips. Specifically, the other end of the first external interface 240 can be connected to the AC side of the energy storage system 100 via a wire and an crocodile clip, and the other end of the second external interface 250 can be connected to the DC side of the energy storage system 100 via a wire and an crocodile clip. Since the crocodile clip is used as the connection method, when the power supply tool 200 needs to be connected to the energy storage system 100, it is only necessary to clamp the crocodile clip on the corresponding terminal, thereby simplifying the connection process between the power supply device and the energy storage system 100.

[0095] The operation process of the power supply tool 200 is described in detail below.

[0096] First, connect the alligator clip of the first external interface 240 to the AC side of the energy storage system 100 (i.e., the power grid 300). The user adjusts the voltage adjustment knob 211 and the current adjustment knob 212 according to the needs of the energy storage system 100. The user can check whether the set target voltage value and target current value are correct through the display 265.

[0097] Furthermore, the alligator clip of the second external interface 250 is connected to the DC side of the energy storage system 100 (i.e., the energy storage battery 110), and then the switch 270 of the power supply tool 200 is turned to the power-on position, and the power supply tool 200 starts to supply power; at the same time, the actual output voltage value and the actual output current value at the second interface are collected by the voltage collection unit and the current collection unit, and displayed on the display 265. The user can check whether the actual output voltage value is consistent with the target voltage value, and whether the actual output current value is consistent with the target current value.

[0098] Finally, the energy storage system 100 is fully charged, and the switch 270 of the charging tool 200 is turned to the off position, and the charging tool 200 stops charging.

[0099] Based on the above embodiments, an embodiment of the present application further provides an energy storage charging system, comprising a charging tool and an energy storage device as described in any of the above embodiments; the charging tool is connected to the energy storage device, and the charging tool is used to charge the energy storage device.

[0100] In this embodiment, the energy storage device can be an energy storage battery of an electric vehicle or an energy storage battery in a charging station. The power replenishment tool can be connected to the energy storage device. When the energy storage device is out of power, the power replenishment tool can replenish the energy storage device and realize AC / DC conversion between the power grid and the energy storage device.

[0101] It should be noted that for details not disclosed in the energy storage charging system of this embodiment, please refer to the details disclosed in the embodiment of the charging tooling of the energy storage system in the embodiment of this specification, which will not be repeated here.

[0102] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply tool for an energy storage system, characterized in that: include: A mechanical adjustment structure for users to set target electrical parameters; an adjustment module, connected to the mechanical adjustment structure, and configured to generate and output a modulation signal according to the target electrical parameter; A power conversion module is connected to the regulation module, and a first interface of the power conversion module is connected to the AC side of the energy storage system, and a second interface of the power conversion module is connected to the DC side of the energy storage system. The power conversion module is used to receive the modulation signal and replenish power for the energy storage system based on the modulation signal.

2. The power supply tooling of the energy storage system according to claim 1, characterized in that: The mechanical adjustment structure includes a voltage adjustment knob and a current adjustment knob, the adjustment module includes a voltage encoder and a current encoder, the target electrical parameter includes a target voltage value and a target current value, and the modulation signal includes a voltage modulation signal and a current modulation signal; The voltage adjustment knob is connected to the voltage encoder, the voltage adjustment knob is used for the user to set the target voltage value, and the voltage encoder is used to generate and output the voltage modulation signal according to the target voltage value; The current adjustment knob is connected to the current encoder, and the current adjustment knob is used for a user to set the target current value. The current encoder is used to generate and output the current modulation signal according to the target current value.

3. The power supply tooling of the energy storage system according to claim 2, characterized in that: The power conversion module includes a first voltage decoder, a first current decoder and a power compensation control circuit; The first voltage decoder is connected to the voltage encoder, and the first voltage decoder is used to receive the voltage modulation signal and obtain the target voltage value according to the voltage modulation signal; The first current decoder is connected to the current encoder, and the first current decoder is used to receive the current modulation signal and obtain the target current value according to the current modulation signal; The supplementary power control circuit is connected to the first voltage decoder and the first current decoder respectively, and is used to detect the output voltage value and the output current value at the second interface, and perform supplementary power according to the comparison result between the output voltage value and the target voltage value and / or the comparison result between the output current value and the target current value.

4. The power supply tooling of the energy storage system according to claim 3, characterized in that: The power replenishment control circuit includes a voltage control unit and a current control unit; One end of the voltage control unit is connected to the first voltage decoder, the other end of the voltage control unit is connected to one end of the current control unit, and the other end of the current control unit is connected to the second interface.

5. The power supply tooling of the energy storage system according to claim 4, characterized in that: The voltage control unit includes a first voltage detector, a second voltage detector, a first branch and a second branch; One end of the first voltage detector and the second voltage detector is connected between the current control unit and the second interface, the other end of the first voltage detector is connected to the first branch, and the other end of the second voltage detector is connected to the second branch; The input ends of the first branch and the second branch are connected to the first voltage decoder, and the output ends of the first branch and the second branch are connected to the current control unit; When the first voltage detector and the second voltage detector detect that the output voltage value is greater than or equal to a preset voltage, control the first branch and the second branch to jointly regulate the voltage; When the first voltage detector and the second voltage detector detect that the output voltage value is less than the preset voltage, any one of the first branch and the second branch is controlled to adjust the voltage.

6. The power supply tooling of the energy storage system according to claim 5, characterized in that: The first branch includes a first comparator, a second comparator and a first controller, and the second branch includes a third comparator and a second controller; A first input terminal of the first comparator is connected to the first voltage decoder, a second input terminal of the first comparator is connected to the first voltage detector, and an output terminal of the first comparator is connected to an input terminal of the first controller; The output end of the first controller is connected to the first input end of the second comparator, the second input end of the second comparator is connected to the output end of the second controller, and the output end of the second comparator is connected to the current control unit; A first input terminal of the third comparator is connected to the first voltage decoder, a second input terminal of the third comparator is connected to the second voltage detector, and an output terminal of the third comparator is connected to an input terminal of the second controller; The first voltage detector and the second voltage detector are used to detect the output voltage value at the second interface, the first comparator is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the third comparator is used to receive the target voltage value and the output voltage value, and compare the target voltage value with the output voltage value, the first controller is used to regulate the voltage according to the comparison result output by the first comparator, and the second controller is used to regulate the voltage according to the comparison result output by the third comparator.

7. The power supply tooling of the energy storage system according to claim 4, characterized in that: The current control unit includes a current detector, a fourth comparator, a third controller, a chip and a PWM modulator; One end of the current detector is connected between the current control unit and the second interface, the other end of the current detector is connected to the second input end of the fourth comparator, the first input end of the fourth comparator receives the comparison current, and the output end of the fourth comparator is connected to the input end of the third controller; wherein the comparison current is the minimum current between the current value output after regulation by the voltage control unit and the target current value; The output end of the third controller is connected to the input end of the chip, the output end of the chip is connected to the input end of the PWM modulator, and the output end of the PWM modulator is connected to the second interface; The current detector is used to detect the output current value at the second interface and output the output current value to the fourth comparator; the fourth comparator is used to receive the comparison current and the output current value and compare the comparison current and the output current value; the third controller is used to regulate the current according to the comparison result output by the fourth comparator.

8. The power supply tooling of the energy storage system according to any one of claims 2 to 7, characterized in that: The power supply tool also includes a first external interface, a second external interface and a display module; The first interface of the power conversion module is connected to the AC side of the energy storage system through the first external interface, and the second interface of the power conversion module is connected to the DC side of the energy storage system through the second external interface; The display module includes a voltage sampling unit, a current sampling unit, a second voltage decoder, a second current decoder and a display; One end of the second voltage decoder is connected to the voltage encoder, and the other end of the second voltage decoder is connected to the display, and the second voltage decoder is used to receive the voltage modulation signal and obtain the target voltage value according to the voltage modulation signal; One end of the second current decoder is connected to the current encoder, and the other end of the second current decoder is connected to the display, and the second current decoder is used to receive the current modulation signal and obtain the target current value according to the current modulation signal; One end of the voltage sampling unit and the current sampling unit is connected between the second interface and the second external interface, and the other end of the voltage sampling unit and the current sampling unit is connected to the display; the voltage sampling unit is used to collect the actual output voltage value of the second interface, and the current sampling unit is used to collect the actual output current value of the second interface; The display is used to display the target voltage value, the target current value, the actual output voltage value or the actual output current value; Wherein, the first external interface and the second external interface are connected to the energy storage system via alligator clips.

9. The power supply tooling of the energy storage system according to claim 8, characterized in that: The power supply tool further includes a switch, the power conversion module further includes a third interface, and the display module further includes a display switching unit; The first normally open node of the switch is connected to the third interface, the second normally open node of the switch is connected to one end of the display switching unit, and the other end of the display switching unit is connected to the display; When the switch is disconnected, the display switching unit controls the display to display the target voltage value and the target current value; When the switch is closed, the display switching unit controls the display to display the target voltage value, the target current value, the actual output voltage value, and the actual output current value.

10. An energy storage charging system, characterized in that: It comprises a power supply tool and an energy storage device as described in any one of claims 1 to 9; The power replenishment tool is connected to the energy storage device, and the power replenishment tool is used to replenish power for the energy storage device.

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