Battery optimizer, battery module and energy storage system

Abstract

The invention provides a battery optimizer, a battery module and an energy storage system. The battery optimizer comprises a switch module, a first auxiliary power supply, a DCDC conversion module and a control module, after the switch module is switched on, electric energy of the battery unit is transmitted to the first auxiliary power supply; the first auxiliary power supply supplies power to the DCDC conversion module and the control module through the transmitted electric energy; after the control module receives power supplied by the first auxiliary power supply and identifies a black start scene, a control signal is sent to the DCDC conversion module; and the DCDC conversion module is communicated with the battery unit after receiving the control signal, and a bus voltage is established through the electric energy of the battery unit. In the mode, when the photovoltaic unit and the power grid do not supply power, a starting unit does not need to be additionally installed to achieve black start, and the implementation cost of the black start is reduced.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a battery optimizer, battery module and energy storage system. Background Technology

[0002] In an energy storage system, the energy storage converter is connected to battery modules, photovoltaic units, the power grid, and loads. When neither the photovoltaic units nor the grid supply power, the battery modules need to have black-start capability to supply power to the energy storage converter, enabling it to start operating. In related technologies, to achieve black start, an additional starting unit needs to be installed. This starting unit uses the battery's electrical energy to establish a bus voltage, thus achieving black start. However, this method of achieving black start by installing a starting unit is costly. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a battery optimizer, battery module and energy storage system that can achieve black start without the need for an additional start-up unit when neither the photovoltaic unit nor the grid is supplying power, thereby reducing the implementation cost of black start.

[0004] In a first aspect, embodiments of this application provide a battery optimizer, which includes: a switching module, a first auxiliary power supply, a DC-DC conversion module, and a control module; one end of the switching module is used to connect to a battery cell, and the other end is connected to the first auxiliary power supply; the first auxiliary power supply is connected to both the DC-DC conversion module and the control module; the control module is connected to the DC-DC conversion module; the DC-DC conversion module is also used to connect to a bus; after the switching module is turned on, it transmits the electrical energy of the battery cell to the first auxiliary power supply; the first auxiliary power supply supplies power to the DC-DC conversion module and the control module through the transmitted electrical energy; after receiving the power supply from the first auxiliary power supply and identifying a black start scenario, the control module sends a control signal to the DC-DC conversion module; after receiving the control signal, the DC-DC conversion module connects to the battery cell and establishes a bus voltage through the electrical energy of the battery cell.

[0005] The aforementioned switch module is equipped with a start button; when the start button is pressed, the switch module is turned on.

[0006] The aforementioned switch module includes a first switch; the first switch is disposed between the battery unit and the first auxiliary power supply; when the start button of the switch module is pressed, the first switch closes, and the battery unit is connected to the first auxiliary power supply.

[0007] The control module is connected to the switch module; the switch module also includes a second switch, one end of which is connected to the first switch and the other end is used for grounding; the control module sends a closing signal to the switch module to control the second switch to close; after the second switch closes, the first switch remains closed.

[0008] The aforementioned DC-DC converter module is equipped with a third switch, which is used to connect to the battery cell. After receiving a control signal, the DC-DC converter module controls the third switch to close, thus connecting the DC-DC converter module to the battery cell.

[0009] The aforementioned battery optimizer also includes a second auxiliary power supply; one end of the second auxiliary power supply is connected to the bus, and the other end is connected to the first auxiliary power supply; when there is bus voltage on the bus, the second auxiliary power supply transfers the power of the bus to the first auxiliary power supply.

[0010] A first diode is provided between the aforementioned switch module and the first auxiliary power supply; the positive terminal of the first diode is connected to the switch module, and the negative terminal is connected to the first auxiliary power supply; a second diode is provided between the second auxiliary power supply and the first auxiliary power supply; the positive terminal of the second diode is connected to the second auxiliary power supply, and the negative terminal is connected to the first auxiliary power supply.

[0011] The control module detects that the voltage of the electrical energy transmitted by the switching module is within the voltage range of the first auxiliary power supply, and sends a stop working signal to the second auxiliary power supply; after receiving the stop working signal, the second auxiliary power supply stops transmitting electrical energy to the first auxiliary power supply.

[0012] The aforementioned second auxiliary power supply is equipped with a fourth switch; the fourth switch is located between the second auxiliary power supply and the bus, or the fourth switch is located between the second auxiliary power supply and the first auxiliary power supply; the control module detects that the voltage of the electrical energy transmitted by the switch module is within the voltage range of the first auxiliary power supply, and controls the fourth switch to open.

[0013] Secondly, embodiments of this application provide a battery module, which includes any of the battery optimizers and battery cells; the battery cells are connected to the battery optimizer.

[0014] Thirdly, embodiments of this application provide an energy storage system, which includes at least one battery module and an energy storage converter; both the battery module and the energy storage converter are connected to a bus.

[0015] The embodiments of this application bring the following beneficial effects:

[0016] The aforementioned battery optimizer, battery module, and energy storage system include a battery optimizer comprising: a switching module, a first auxiliary power supply, a DC-DC conversion module, and a control module. One end of the switching module is connected to the battery cell, and the other end is connected to the first auxiliary power supply. The first auxiliary power supply is connected to both the DC-DC conversion module and the control module. The control module is connected to the DC-DC conversion module. The DC-DC conversion module is also connected to the bus. After the switching module is turned on, it transmits the electrical energy from the battery cell to the first auxiliary power supply. The first auxiliary power supply supplies power to the DC-DC conversion module and the control module through the transmitted electrical energy. After receiving the power supply from the first auxiliary power supply and identifying a black start scenario, the control module sends a control signal to the DC-DC conversion module. After receiving the control signal, the DC-DC conversion module connects to the battery cell and establishes the bus voltage through the electrical energy from the battery cell.

[0017] In this method, a switching module is set in the battery optimizer. By turning on the switching module, the battery power supplies the DC-DC conversion module and the control module. The control module controls the DC-DC conversion module to establish the bus voltage through the battery power, which can realize the black start of the battery optimizer. When neither the photovoltaic unit nor the grid supplies power, there is no need to install an additional starting unit to realize the black start, thus reducing the implementation cost of black start.

[0018] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application are realized and obtained through the structures particularly pointed out in the description, claims and drawings.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the connection topology of an energy storage system in related technologies;

[0022] Figure 2 This is a schematic diagram of the structure of the first type of battery optimizer provided in the embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the connection topology of a first type of battery optimizer provided in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the second type of battery optimizer provided in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the connection topology of the second type of battery optimizer provided in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the battery module provided in an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of the parallel connection topology of multiple battery modules provided in an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of an energy storage system provided in an embodiment of this application. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] See Figure 1 The diagram shows the connection topology of an energy storage system. The energy storage converter in the system connects to battery modules, photovoltaic units, the power grid, and loads. Multiple battery modules are connected in parallel to form a battery cluster. Each battery module includes a battery optimizer and battery cells. When neither the photovoltaic units nor the grid supply power, the battery modules need to have black-start capability to supply power to the energy storage converter, enabling it to start operating. In other words, if the battery modules lack black-start capability when neither the photovoltaic power source nor the grid supplies power, the energy storage converter cannot start, and the battery power cannot be delivered to the load.

[0031] In related technologies, a starting unit needs to be installed to achieve black start. The starting unit can be connected between a battery cell and the DC bus. The starting unit uses the battery's electrical energy to establish the bus voltage to a preset voltage, thereby achieving black start. However, achieving black start by installing a starting unit is costly, especially for large-capacity energy storage systems, which require starting units with higher power ratings. Furthermore, if the voltage of the battery cell connected to the starting unit is insufficient, the energy storage system will be unable to complete a black start.

[0032] Based on this, the battery optimizer, battery module and energy storage system provided in this application embodiment can be applied to devices containing the battery optimizer.

[0033] To facilitate understanding of this embodiment, a battery optimizer disclosed in this application will first be described in detail, such as... Figure 2 The schematic diagram of the first type of battery optimizer shown includes: a switching module, a first auxiliary power supply, a DC-DC conversion module, and a control module. In this embodiment, a switching module is added to the battery optimizer so that each battery optimizer has black-start capability.

[0034] One end of the aforementioned switch module is used to connect to the battery cell, and the other end is used to connect to the first auxiliary power supply; the first auxiliary power supply is connected to both the DC-DC conversion module and the control module; the control module is connected to the DC-DC conversion module; the DC-DC conversion module is also used to connect to the busbar.

[0035] The aforementioned first auxiliary power supply can supply power to the low-voltage components of the control module and the DC-DC conversion module. These low-voltage components may include, for example, sampling circuits, drive circuits, and communication circuits.

[0036] A start button can be installed in the switch module. When the start button is pressed, the switch module is turned on. The switch module may also include at least one switch, which is typically a controllable switch, such as a transistor, an insulated-gate bipolar transistor, or a metal-oxide-semiconductor field-effect transistor. By controlling the closing or opening of the switch in the switch module, the continuity of the circuit between the battery cell and the first auxiliary power supply can be controlled.

[0037] The aforementioned start button can be located outside the switch module housing, and the start button can be a push-button type. When the start button is pressed, the aforementioned controllable switch closes, at which point the battery unit supplies power to the first auxiliary power source.

[0038] The first auxiliary power supply is used to convert the input voltage, enabling the entire system to be energized and thus conduct signals. This input voltage is the voltage output by the aforementioned battery unit.

[0039] Optionally, the battery optimizer may also include a second auxiliary power supply, meaning each battery optimizer includes at least one auxiliary power supply. The second auxiliary power supply is used to transfer electrical energy from the bus to the first auxiliary power supply.

[0040] After the aforementioned switch module is turned on, it transmits the electrical energy of the battery unit to the first auxiliary power supply; the first auxiliary power supply supplies power to the DC-DC conversion module and the control module through the transmitted electrical energy.

[0041] Specifically, when the operator presses the start button in the switch module, the control module detects the black start and generates a black start signal. Upon receiving the black start signal, the switch module controls the internal switch to close, connecting the circuit between the battery unit and the first auxiliary power supply, thus transferring the battery unit's electrical energy to the first auxiliary power supply.

[0042] Through voltage conversion, the first auxiliary power supply transmits electrical energy to the low-voltage system of the DC-DC module for power supply, such as the signal processing system. At the same time, the first auxiliary power supply supplies power to the control module, enabling the control module to transmit operating status signals to the switching module, DC-DC conversion module, or auxiliary power supply. These operating status signals can be control signals, stop signals, closing signals, etc.

[0043] In an exemplary embodiment, see Figure 3 A schematic diagram of the connection topology for the first type of battery optimizer. If based on... Figure 3 The battery optimizer shown obtains battery modules. To connect multiple battery modules in parallel on the same bus, you need to press the start button for each battery optimizer.

[0044] After receiving power from the first auxiliary power source and identifying a black start scenario, the control module sends a control signal to the DC-DC conversion module. Upon receiving the control signal, the DC-DC conversion module connects to the battery unit and establishes the bus voltage using the power from the battery unit.

[0045] After receiving power from the first auxiliary power source, the control module can identify the black start mode through preset logic, establish a communication connection with the DC-DC conversion module, and send control signals to the DC-DC conversion module.

[0046] The control signal may specifically include a preset voltage. After receiving the control signal, the DC-DC converter module can control the internal switch to close, connecting with the battery cell and receiving electrical energy from the battery cell. The DC-DC converter module can then raise the received battery cell voltage to the preset voltage, establishing the bus voltage, thereby enabling the energy storage converter to operate normally and achieving black start.

[0047] Optionally, once the first battery optimizer establishes the bus voltage, the second auxiliary power supply of the second battery optimizer can transfer the power from the bus to the first auxiliary power supply, thereby enabling the second battery optimizer to start up.

[0048] The aforementioned battery optimizer includes: a switching module, a first auxiliary power supply, a DC-DC conversion module, and a control module; one end of the switching module is connected to the battery cell, and the other end is connected to the first auxiliary power supply; the first auxiliary power supply is connected to both the DC-DC conversion module and the control module; the control module is connected to the DC-DC conversion module; the DC-DC conversion module is also used to connect to the bus; after the switching module is turned on, it transmits the electrical energy from the battery cell to the first auxiliary power supply; the first auxiliary power supply supplies power to the DC-DC conversion module and the control module through the transmitted electrical energy; after receiving the power supply from the first auxiliary power supply, the control module sends a control signal to the DC-DC conversion module; after receiving the control signal, the DC-DC conversion module connects to the battery cell and establishes the bus voltage through the electrical energy from the battery cell.

[0049] In this method, a switching module is set in the battery optimizer. By turning on the switching module, the battery power supplies the DC-DC conversion module and the control module. The control module controls the DC-DC conversion module to establish the bus voltage through the battery power, which can realize the black start of the battery optimizer. When neither the photovoltaic unit nor the grid supplies power, there is no need to install an additional starting unit to realize the black start, thus reducing the implementation cost of black start.

[0050] See the following examples Figure 4 The diagram shows the structure of the second type of battery optimizer.

[0051] In one specific implementation, the switch module includes a first switch; the first switch is disposed between the battery unit and the first auxiliary power supply; when the start button of the switch module is pressed, the first switch closes, and the battery unit is connected to the first auxiliary power supply.

[0052] The first switch can control the circuit to turn on when a low-level signal is received.

[0053] Specifically, when the start button of the switch module is pressed, the first switch closes, thus turning on the circuit, at which point the battery unit can input electrical energy into the first auxiliary power supply.

[0054] Furthermore, the control module is connected to the switch module; the switch module also includes a second switch, one end of which is connected to the first switch and the other end is used for grounding; the control module sends a closing signal to the switch module to control the second switch to close; after the second switch closes, the first switch remains closed.

[0055] Specifically, after the second switch is closed, the first switch is grounded. After the start button of the switch module is released, the first switch remains closed. The second switch can control the circuit to conduct when it receives a high-level signal.

[0056] See Figure 4After receiving power from the first auxiliary power source, the control module establishes a communication connection with the switch module and then sends a closing signal to the switch module. Upon receiving the closing signal, the switch module controls the second switch to close, thereby turning on the circuit and grounding the first switch. When the first switch is grounded, a low-level signal can always be received. At this time, the start button of the switch module pops up, and the first switch remains closed, thus maintaining the circuit's conduction.

[0057] In one specific implementation, the DC-DC converter module is equipped with a third switch for connecting the battery cell; after receiving a control signal, the DC-DC converter module controls the third switch to close, thus connecting the DC-DC converter module to the battery cell.

[0058] Initially, the third switch in the DC-DC converter module is open. When the DC-DC converter module receives a control signal from the control module, it closes the third switch, thus turning on the circuit and connecting the DC-DC converter module to the battery cell.

[0059] In one specific implementation, the battery optimizer further includes a second auxiliary power supply; one end of the second auxiliary power supply is connected to the bus, and the other end is connected to the first auxiliary power supply; when there is a bus voltage on the bus, the second auxiliary power supply transfers the electrical energy of the bus to the first auxiliary power supply.

[0060] For example, the second auxiliary power supply can reduce the bus voltage, and the reduced voltage is matched with the input voltage of the battery cell. The reduced voltage power is then input to the first auxiliary power supply, enabling the first auxiliary power supply to operate normally.

[0061] Specifically, multiple battery optimizers are typically connected in parallel on the same bus. After the first battery optimizer (1) completes its black start, the DC-DC converter module of each battery optimizer establishes the bus voltage, which is the high-voltage side. The high-voltage sides of the other battery optimizers besides battery optimizer (1) are energized, and a black start can be completed through a second auxiliary power supply. See also... Figure 4 When the circuit is on, and there is bus voltage on the bus, the second auxiliary power supply can transfer electrical energy from the bus to the first auxiliary power supply. Each battery optimizer can be equipped with one second auxiliary power supply.

[0062] Furthermore, a first diode is provided between the switching module and the first auxiliary power supply; the positive terminal of the first diode is connected to the switching module, and the negative terminal is connected to the first auxiliary power supply; a second diode is provided between the second auxiliary power supply and the first auxiliary power supply; the positive terminal of the second diode is connected to the second auxiliary power supply, and the negative terminal is connected to the first auxiliary power supply.

[0063] By setting a first diode and a second diode, the voltage output by the switching module and the voltage output by the second auxiliary power supply can be compared, and the larger voltage can be input into the first auxiliary power supply.

[0064] Specifically, the current in a diode can only flow from the positive terminal to the negative terminal. Therefore, when the voltage output by the switching module is greater than the voltage output by the second auxiliary power supply, the current through the first diode flows in the forward direction, thus turning on the circuit, while the current through the second diode blocks the flow in the reverse direction, thus turning off the circuit. At this time, the voltage output by the switching module is input into the first auxiliary power supply.

[0065] When the voltage output by the second auxiliary power supply is greater than the voltage output by the switching module, the current through the second diode flows in the forward direction, thus turning on the circuit, while the current through the first diode blocks in the reverse direction, thus turning off the circuit. At this time, the voltage output by the second auxiliary power supply is input into the first auxiliary power supply.

[0066] In one specific implementation, the control module detects that the voltage of the electrical energy transmitted by the switching module is within the voltage range of the first auxiliary power supply, and sends a stop working signal to the second auxiliary power supply; after receiving the stop working signal, the second auxiliary power supply stops transmitting electrical energy to the first auxiliary power supply.

[0067] The control module detects that the voltage of the electrical energy transmitted by the switching module is within the voltage range of the first auxiliary power supply, that is, the voltage of the electrical energy meets the working requirements of the first auxiliary power supply, and when it recognizes that the current situation is not a black start scenario, it sends a stop working signal to the second auxiliary power supply.

[0068] Specifically, multiple battery optimizers are typically connected in parallel on the same bus. After the first battery optimizer 1 completes its black start, if the voltage of the power transmitted by the switching module is within the voltage range of the first auxiliary power supply, then the input voltage of the auxiliary power supply for battery optimizer 1 is transmitted by the switching module. When the control module detects this condition, it can send a stop signal to the second auxiliary power supply, causing the second auxiliary power supply to stop transmitting power to the first auxiliary power supply, thus avoiding unnecessary energy loss.

[0069] Furthermore, the second auxiliary power supply is equipped with a fourth switch; the fourth switch is located between the second auxiliary power supply and the bus, or between the second auxiliary power supply and the first auxiliary power supply; the control module detects that the voltage of the electrical energy transmitted by the switch module is within the voltage range of the first auxiliary power supply, and controls the fourth switch to open. Figure 4 In the example, the fourth switch is located between the second auxiliary power supply and the busbar.

[0070] Specifically, when the control module detects that the voltage of the electrical energy transmitted by the switching module is within the voltage range of the first auxiliary power supply, it can control the fourth switch to open, thereby stopping the second auxiliary power supply from transmitting electrical energy to the first auxiliary power supply and avoiding unnecessary energy loss.

[0071] Understandably, the above method only exists in battery optimizer 1 that achieves black start through battery cells. Other battery optimizers besides battery optimizer 1 complete black start through a second auxiliary power supply, so they do not need to achieve black start through battery cells.

[0072] In one embodiment, see Figure 5 The connection topology diagram of the second type of battery optimizer.

[0073] exist Figure 5 In the diagram, K1 is the first switch, and K2 is the second switch. K1 turns on when it receives a low-level signal, and K2 turns on when it receives a high-level signal. D1 is the first diode, and D2 is the second diode. K4 is the fourth switch.

[0074] For the first activated battery optimizer 1, when the start button is pressed, K1 closes, and the energy from the battery cell is transferred to the first auxiliary power supply, enabling the entire system to operate normally. After the control module is operating normally, it can send a control signal to the DC-DC converter module. Upon receiving the control signal, the DC-DC converter module controls its internal switch to close, connecting with the battery cell to establish the bus voltage. Furthermore, after the control module is operating normally, it can send a closing signal to the switch module to control the closing of K2. After K2 closes, K1 is grounded and remains closed, at which point the start button can be released. When the voltage transmitted by the switch module is greater than the voltage transmitted by the second auxiliary power supply, the voltage of the first auxiliary power supply is transmitted by the switch module. At this time, the control module detects the current operating condition and sends a stop signal to the second auxiliary power supply, or... Figure 5 K4 in the circuit sends a disconnect signal, thereby stopping the second auxiliary power supply from working.

[0075] For battery optimizers other than battery optimizer 1 connected in parallel on the same bus, a black start can be synchronously completed via the second auxiliary power supply after battery optimizer 1 completes its black start and establishes the bus voltage. This method avoids the problems of poor startup experience and low reliability caused by the need to install a startup unit in all battery modules.

[0076] See Figure 6 The diagram shows the structure of a battery module, which includes the aforementioned battery optimizer and battery cells; the battery cells are connected to the battery optimizer.

[0077] In one embodiment, see Figure 7 A schematic diagram of the parallel connection topology of multiple battery modules.

[0078] Figure 7 In this configuration, battery module 1 includes the aforementioned battery optimizer, which is connected to the battery cells. Battery module 1, battery module 2, ..., battery module n are connected in parallel on the same busbar.

[0079] This embodiment also provides an energy storage system, see [link to documentation]. Figure 8 The energy storage system includes at least one battery module and an energy storage converter; both the battery module and the energy storage converter are connected to the bus.

[0080] The embodiments provided in this application have the following advantages:

[0081] This embodiment achieves black start functionality by adding a simple switch module to the DC-DC conversion module in the battery module, resulting in lower costs.

[0082] In this embodiment, each battery module has a black start function. After one battery module completes a black start, the high-voltage side of the DC-DC conversion module establishes a bus voltage, and the high-voltage side of other battery modules connected in parallel with that battery module is energized. Black start can be completed through the second auxiliary power supply. Therefore, no operation is required for other battery modules to complete the black start synchronously. The operation is simple and the reliability is high.

[0083] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0084] Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0085] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0086] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0087] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery optimizer, characterized in that, The battery optimizer includes: a switching module, a first auxiliary power supply, a DC-DC conversion module, and a control module; One end of the switch module is used to connect to the battery cell, and the other end is used to connect to the first auxiliary power supply; the first auxiliary power supply is connected to the DC-DC conversion module and the control module respectively; the control module is connected to the DC-DC conversion module; the DC-DC conversion module is also used to connect to the bus. After the switch module is turned on, it transmits the electrical energy of the battery unit to the first auxiliary power source; the first auxiliary power source supplies power to the DC-DC conversion module and the control module through the transmitted electrical energy. After receiving power from the first auxiliary power source and identifying a black start scenario, the control module sends a control signal to the DC-DC conversion module. Upon receiving the control signal, the DC-DC conversion module connects to the battery unit and establishes a bus voltage using the power from the battery unit.

2. The battery optimizer according to claim 1, characterized in that, The switch module is equipped with a start button; when the start button is pressed, the switch module is turned on.

3. The battery optimizer according to claim 1, characterized in that, The switching module includes a first switch; the first switch is disposed between the battery cell and the first auxiliary power source. When the start button of the switch module is pressed, the first switch closes, and the battery unit is connected to the first auxiliary power source.

4. The battery optimizer according to claim 3, characterized in that, The control module is connected to the switch module; the switch module further includes a second switch, one end of which is connected to the first switch and the other end is used for grounding. The control module sends a closing signal to the switch module to control the second switch to close; after the second switch closes, the first switch remains closed.

5. The battery optimizer according to claim 1, characterized in that, The DC-DC conversion module is equipped with a third switch, which is used to connect the battery cell. After receiving the control signal, the DC-DC conversion module controls the third switch to close, and the DC-DC conversion module is connected to the battery unit.

6. The battery optimizer according to claim 1, characterized in that, The battery optimizer also includes a second auxiliary power supply; one end of the second auxiliary power supply is connected to the bus, and the other end is connected to the first auxiliary power supply. When a bus voltage is present on the bus, the second auxiliary power supply transmits the electrical energy of the bus to the first auxiliary power supply.

7. The battery optimizer according to claim 6, characterized in that, A first diode is provided between the switching module and the first auxiliary power supply; the positive terminal of the first diode is connected to the switching module, and the negative terminal is connected to the first auxiliary power supply. A second diode is provided between the second auxiliary power supply and the first auxiliary power supply; the positive terminal of the second diode is connected to the second auxiliary power supply, and the negative terminal is connected to the first auxiliary power supply.

8. The battery optimizer according to claim 6, characterized in that, The control module detects that the voltage of the electrical energy transmitted by the switching module is within the voltage range of the first auxiliary power supply, and sends a stop working signal to the second auxiliary power supply; After receiving the stop signal, the second auxiliary power supply stops transmitting power to the first auxiliary power supply.

9. The battery optimizer according to claim 6, characterized in that, The second auxiliary power supply is equipped with a fourth switch; the fourth switch is located between the second auxiliary power supply and the bus, or the fourth switch is located between the second auxiliary power supply and the first auxiliary power supply. The control module detects that the voltage of the electrical energy transmitted by the switch module is within the voltage range of the first auxiliary power supply, and controls the fourth switch to open.

10. A battery module, characterized in that, The battery module includes the battery optimizer according to any one of claims 1-9, and further includes a battery cell; the battery cell is connected to the battery optimizer.

11. An energy storage system, characterized in that, The energy storage system includes at least one battery module as described in claim 10, and further includes an energy storage converter; Both the battery module and the energy storage converter are connected to the bus.

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