Energy storage battery system and low-voltage activation remediation control method thereof

Abstract

The invention provides an energy storage battery system and a low-voltage activation remediation control method thereof, and the control method comprises the following steps: adjusting the output voltage of an external communication power supply to a first preset value V4 when a battery PACK is in a low-voltage unable-to-start state, so as to start a DCDC module and wake up a battery management system BMS; the BMS applies for a charging voltage V1 and a current I1 from an external communication power supply; a pre-charging loop of the battery PACK is switched on, so that a pre-charging resistor is connected into a charging main loop, and at the moment, the output voltage V1 of the external communication power supply charges the battery PACK with the current I1; when the voltage of the battery PACK reaches a second preset value V2, stopping charging, and controlling to enter a normal charging logic until charging remedy is finished; wherein the voltage V2 of the battery PACK supports the normal work of the battery management system BMS. In the invention, at the initial stage of charging, the pre-charging resistor is connected in series in the charging loop, so that the output voltage V1 of the external communication power supply cannot be clamped to be lower than the starting voltage, and the problem that the external communication power supply cannot be started is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage systems, and particularly relates to an energy storage battery system and a low-voltage activation and remedy control method therefor. Background Art

[0002] At present, the power supply of the battery management system (BMS) applied in the energy storage battery system is generally based on the battery itself or an external power supply. However, for the protection of the battery, the battery voltage cannot be reduced to a very low level for startup. Therefore, when the battery voltage is lower than a certain value, the auxiliary power supply part of the battery management system cannot be started.

[0003] Current situation 1 at present:

[0004] If an external power supply is directly used for power supply, the input voltage of the DCDC module will be clamped to a low voltage state by the battery voltage, resulting in inability to start and also unable to open the charge and discharge control loop. Therefore, in related technologies, it is mostly impossible to rescue the battery through external charging. Usually, it is necessary to open the box of the battery PACK to directly charge the battery cells until the voltage is charged to a level where the BMS can start the charge and discharge loop before external charging can be carried out. This operation method is not only cumbersome but also wastes a lot of manpower and material resources, and may cause battery short-circuit fire during the unpacking process, thus causing losses to personnel and property.

[0005] Current situation 2 at present:

[0006] If a second external auxiliary power supply is used to supply power to the BMS, although the above problems can be solved, it will increase the cost of the battery PACK and the design is relatively cumbersome. In addition, under weak grid or off-grid conditions, the situation of low-voltage battery power shortage cannot be avoided, and the power supply reliability has not been substantially improved.

[0007] In summary, the existing battery energy storage systems have obvious limitations in low-voltage activation and remedy, and there is an urgent need for a more efficient, safe and economical solution. Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose,

[0009] According to an embodiment of the present disclosure, a low-voltage activation and remedy control method for an energy storage battery system is provided, including the following steps:

[0010] When the battery PACK is in a low-voltage inoperable state, adjust the output voltage of the external communication power supply to a first preset value V4 to provide low-voltage power greater than the startup voltage to the DCDC module to start the DCDC module and wake up the battery management system BMS;

[0011] The battery management system BMS applies for a charging voltage V1 and a current I1 from the external communication power supply;

[0012] Turn on the pre-charge circuit of the battery PACK so that the pre-charge resistor is connected to the main charging circuit. At this time, the output voltage V1 of the external communication power supply is equal to the sum of the voltage across the pre-charge resistor and the voltage of the battery PACK, and the battery PACK is charged with the current I1;

[0013] When the voltage of the battery PACK reaches the second preset value V2, stop charging and control to enter the normal charging logic until the charging remedy ends; wherein, the voltage V2 of the battery PACK supports the normal operation of the battery management system BMS.

[0014] In the above technical solution, there are the following advantages or beneficial effects: When the voltage of the battery PACK is lower than the starting voltage of the DCDC module and cannot be started normally, the external communication power supply provides the starting voltage, which can quickly start the DCDC module and wake up the battery management system BMS, so as to realize the activation and charging remedy of the low-voltage battery. In the initial stage of charging, the pre-charge resistor is connected in series in the charging circuit. Due to the voltage-dividing effect of the pre-charge resistor, the output voltage V1 of the external communication power supply will not be clamped to be lower than the starting voltage, avoiding the problem that it still cannot be started. Using the external communication power supply, the battery cells can be charged directly without opening the battery PACK box, thus avoiding safety risks such as battery short circuit and fire caused by the unpacking operation. Compared with adding a second external auxiliary power supply, this technical solution does not require additional hardware design, avoiding increasing costs and system complexity.

[0015] According to an embodiment of the present disclosure, the low-voltage activation remedy control method for the energy storage battery system further includes:

[0016] If the voltage of the battery PACK is less than the second preset value V2, control the external communication power supply to continue charging the battery PACK with the current I1 until the voltage of the battery PACK reaches the second preset value V2 and stop charging.

[0017] In the above technical solution, there are the following advantages or beneficial effects: By controlling the external communication power supply to continuously charge with a fixed current I1 until the voltage of the battery PACK reaches the second preset value V2, it is ensured that the voltage of the battery PACK can stably reach the lowest voltage threshold to support the normal operation of the BMS and the DCDC module, effectively avoiding the problem that the BMS cannot be started normally or enters the low-voltage state where it cannot be started again due to insufficient voltage of the battery PACK, thereby improving the reliability and stability of the entire system.

[0018] According to an embodiment of the present disclosure, entering the normal charging logic includes:

[0019] Turn on the main circuit for charging and disconnect the pre-charge circuit;

[0020] The battery management system BMS applies for a new charging voltage V3 and current I3 to the external communication power supply, and the external communication power supply charges the battery PACK with the charging voltage V3 and current I3.

[0021] In the above technical solution, there are the following advantages or beneficial effects: After stopping charging, the battery PACK is charged with the new charging voltage V3 and current I3 to ensure that the battery can continue to charge and recover to a state where it can work normally, meeting the subsequent usage requirements and achieving charging remedy.

[0022] According to an embodiment of the present disclosure, the pre-charge circuit includes a branch formed by connecting the pre-charge resistor and the pre-charge switch in series, and the branch is connected in parallel with one of the positive switch and the negative switch of the main circuit;

[0023] Turning on the pre-charge circuit of the battery PACK includes:

[0024] Sequentially close the pre-charge switch and the other of the positive switch and the negative switch to turn on the pre-charge circuit.

[0025] In the above technical solution, there are the following advantages or beneficial effects: This activation remedy control method can be adapted to the circuit architectures in different battery PACKs, can flexibly adapt to different circuit design requirements, reduces the design complexity caused by circuit architecture differences, and enables the battery system to be integrated into different application scenarios more quickly.

[0026] According to an embodiment of the present disclosure, the DCDC module is electrically connected to the external communication power supply and the battery cells of the battery PACK for supplying power to the battery management system BMS.

[0027] In the above technical solution, there are the following advantages or beneficial effects: The DCDC module can obtain power from both the external communication power supply and the battery cells used for storing electricity, and the dual power supply method improves the flexibility and reliability of the system.

[0028] According to an embodiment of the present disclosure, the low-voltage activation remedy control method for the energy storage battery system further includes: real-time detecting the voltage of the battery PACK, and if the voltage of the battery PACK is less than the starting voltage, it is determined that the battery PACK is in a low-voltage inoperable state.

[0029] The above technical solution has the following advantages or beneficial effects: By monitoring the voltage of the battery PACK in real time, it is possible to detect and take measures in a timely manner when the voltage is lower than the starting voltage, avoid problems such as inability to start or operating failures caused by low voltage, prevent the battery PACK from being over-discharged, and extend the service life of the battery PACK.

[0030] According to an embodiment of the present disclosure, there is also provided an energy storage battery system for implementing the low-voltage activation and remedial control method of the energy storage battery system according to any one of the above, and the energy storage battery system includes:

[0031] An external communication power supply;

[0032] A battery PACK, which includes a battery management system BMS and battery cells, the battery cells are electrically connected to the external communication power supply through a main circuit, and a pre-charge circuit is provided on the main circuit;

[0033] The battery management system BMS includes:

[0034] A communication module, which is communicatively connected to the external communication power supply;

[0035] A DCDC module, which is connected to the battery cells and the external communication power supply. The DCDC module is used to connect to the external communication power supply and perform charging remedial measures for the battery PACK when the battery PACK is in a state of being unable to start due to low voltage.

[0036] The above technical solution has the following advantages or beneficial effects: By the DCDC module in the battery management system BMS, when the battery PACK is in a state of being unable to start due to low voltage, the DCDC module is connected to the external communication power supply to directly charge the battery PACK quickly, ensuring that the battery management system BMS can be started and operated normally, and improving the reliability of use of the energy storage battery system.

[0037] According to an embodiment of the present disclosure, the battery management system further includes:

[0038] A sampling module, which is connected to the battery PACK and is used to detect the voltage, charging current, and discharging current of the battery PACK in real time;

[0039] A control module, which is connected to the sampling module, the communication module, and the DCDC module. The starting voltage is stored in the control module. If the voltage of the battery PACK detected by the sampling module is lower than the starting voltage, the control module controls the battery management system BMS to execute the low-voltage activation and remedial control method.

[0040] The above technical solution has the following advantages or beneficial effects: The sampling module can detect the voltage, charging current, and discharging current of the battery PACK in real time, providing accurate data support for the BMS. The control module judges the battery state based on this data and automatically executes the low-voltage activation and remedy control logic when the voltage is lower than the starting voltage, significantly improving the safety and reliability of the energy storage battery system.

[0041] According to an embodiment of the present disclosure, the battery management system further includes: a driving module configured to drive and conduct or disconnect the main circuit and the pre-charge circuit.

[0042] The above technical solution has the following advantages or beneficial effects: The driving module can accurately control the switching states of the main circuit and the pre-charge circuit, ensuring that the on-off operations of the circuit meet the safety requirements under low-voltage conditions.

[0043] According to an embodiment of the present disclosure, the external communication power supply is a DC power supply with communication or a power conversion system PCS for energy storage.

[0044] The above technical solution has the following advantages or beneficial effects: Selecting a DC power supply with communication function or a power conversion system PCS for energy storage as the external communication power supply can meet the requirements of all application scenarios. Description of the Drawings

[0045] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0046] Figure 1 is a flowchart of a low-voltage activation and remedy control method for an energy storage battery system according to an embodiment of the present application;

[0047] Figure 2 is a flowchart of a low-voltage activation and remedy control method for an energy storage battery system according to another embodiment of the present application;

[0048] Figure 3 is a circuit architecture diagram of an energy storage battery system according to an embodiment of the present application;

[0049] Figure 4 is a circuit architecture diagram of an energy storage battery system according to another embodiment of the present application;

[0050] Figure 5 is a control flowchart taking the PCS as the external communication power supply as an example according to an embodiment of the present application.

[0051] In the above figures, energy storage battery system 10; external communication power supply 1; battery PACK 2; DCDC module 21; pre-charge resistor R1; battery cell 23; communication module 24; sampling module 25; control module 26; drive module 27. Detailed implementation mode

[0052] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0054] The terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The present invention provides a low-voltage activation and remedy control method for an energy storage battery system, which can activate and charge-remedy the battery PACK 2 by using the external communication power supply 1 when the battery PACK 2 is in a low-voltage state and unable to start, until the power of the battery PACK 2 is restored to the designed capacity, and the charge-remedy is completed.

[0057] Refer to Figure 1 , the low-voltage activation and remedy control method for an energy storage battery system includes the following steps:

[0058] Step S1: When the battery PACK2 is in a state where it cannot be started due to low voltage, adjust the output voltage of the external communication power supply 1 to the first preset value V4, and supply low voltage greater than the starting voltage to the DCDC module 21 to start the DCDC module 21 and wake up the battery management system BMS;

[0059] Step S2: The battery management system BMS applies for the charging voltage V1 and current I1 from the external communication power supply 1;

[0060] Step S3: Turn on the pre-charge circuit of the battery PACK2 to connect the pre-charge resistor R1 to the main charging circuit. At this time, the output voltage V1 of the external communication power supply 1 is equal to the sum of the voltage on the pre-charge resistor R1 and the voltage of the battery PACK2, and charge the battery PACK2 with the current 11;

[0061] Step S4: When the voltage of the battery PACK2 reaches the second preset value V2, stop charging and execute Step S5: Control to enter the normal charging logic until the charging remedy ends; among them, the voltage V2 of the battery PACK2 supports the normal operation of the battery management system BMS.

[0062] In this embodiment, when the voltage of the battery PACK2 is lower than the starting voltage of the DCDC module 21 and cannot be started normally, by providing the starting voltage through the external communication power supply 1, the DCDC module 21 can be quickly started and the battery management system BMS can be woken up, thereby realizing the activation and charging remedy of the low-voltage battery.

[0063] In the initial stage of charging, the pre-charge resistor R1 is connected in series in the charging circuit. Due to the voltage-dividing effect of the pre-charge resistor R1, the output voltage V1 of the external communication power supply 1 will not be clamped to be lower than the starting voltage. Therefore, it can effectively avoid the problem that the voltage of the battery PACK2 clamps the output voltage of the external communication power supply 1, resulting in charging failure and inability to start.

[0064] Among them, using the external communication power supply 1 for activation remedy can directly charge the battery cells 23 of the battery PACK2 without opening the battery PACK2 box body, thereby avoiding safety risks such as battery short circuit and fire that may be caused by the unpacking operation. At the same time, compared with the solution of adding a second external auxiliary power supply in the related technology, this technical solution does not require additional hardware design, avoiding increased costs and system complexity.

[0065] Furthermore, the low-voltage activation remedy control method for the energy storage battery system further includes:

[0066] If the voltage of the battery PACK2 is less than the second preset value V2, control the external communication power supply 1 to continue charging the battery PACK2 with the current I1 until the voltage of the battery PACK2 reaches the second preset value V2 and stop charging.

[0067] Specifically, referring to Figure 2 , step S3 may include:

[0068] Step S31: Turn on the pre-charge circuit of battery PACK2 to connect the pre-charge resistor R1 to the main charging circuit;

[0069] Step S32: Charge battery PACK2 with the charging voltage V1 and current I1 of the external communication power supply 1.

[0070] After executing step S32, execute step S33 to determine whether the voltage of battery PACK2 reaches the second preset value V2. If so, execute step S4. If not, continue to execute step S34 until the second preset value V2 is reached and charging stops.

[0071] In this embodiment, by controlling the external communication power supply 1 to continuously charge with a fixed current I1 until the voltage of battery PACK2 reaches the second preset value V2, it is ensured that the voltage of battery PACK2 can stably reach the minimum voltage threshold to support the normal operation of the BMS and DCDC module 21, effectively avoiding the situation that the BMS cannot be started normally or enters the low-voltage inoperable state again after startup due to insufficient voltage of battery PACK2, thereby improving the reliability and stability of the entire system.

[0072] In some embodiments of the present application, entering the normal charging logic includes:

[0073] Turn on the main charging circuit and disconnect the pre-charge circuit;

[0074] The battery management system BMS applies for a new charging voltage V3 and current I3 to the external communication power supply 1, and the external communication power supply 1 charges battery PACK2 with the charging voltage V3 and current I3.

[0075] In this embodiment, after charging stops, battery PACK2 is charged with the new charging voltage V3 and current I3 to ensure that the battery can continue to charge and recover to a normal working state, meeting subsequent usage requirements and achieving charging remediation.

[0076] Referring to Figure 3 , Figure 4 , the pre-charge circuit includes a pre-charge resistor R1 and a pre-charge switch K1. The branch formed by the series connection of the pre-charge resistor R1 and the pre-charge switch K1 is connected in parallel with one of the positive-pole switch K2 and the negative-pole switch K3 of the main circuit.

[0077] That is to say, referring to Figure 3 , the branch can be connected in parallel with the positive-pole switch K2. Referring to Figure 4 , the branch can also be connected in parallel with the negative-pole switch K3.

[0078] In the above embodiments, the pre-charge circuit for turning on the battery PACK2 includes: sequentially closing the pre-charge switch K1 and the other one of the positive electrode switch K2 and the negative electrode switch K3 to turn on the pre-charge circuit.

[0079] In this embodiment, the activation and remedy control method can be adapted to the circuit architectures in different battery PACK2s, can flexibly adapt to different circuit design requirements, reduces the design complexity caused by circuit architecture differences, and enables the battery system to be more quickly integrated into different application scenarios.

[0080] Specifically, referring to Figure 3 , when the branch is in parallel with the positive electrode switch K2, first close the pre-charge switch K1, and then close the negative electrode switch K3 to turn on the pre-charge circuit. Referring to Figure 4 , when the branch is in parallel with the negative electrode switch K3, first close the pre-charge switch K1, and then close the positive electrode switch K2 to turn on the pre-charge circuit.

[0081] It can be understood that different circuit architectures in the battery PACK2 can be selected according to actual application scenarios and design requirements. Exemplarily, the circuit architecture with the pre-charge resistor R1 in parallel with the positive electrode switch K2 may be more suitable for scenarios that require strict control of the positive electrode current, while the circuit architecture with the pre-charge resistor R1 in parallel with the negative electrode switch K3 may be more suitable for simplifying the design of the negative electrode circuit.

[0082] Furthermore, the DCDC module 21 is electrically connected to the external communication power supply 1 and the battery cell 23 for supplying power to the battery management system BMS.

[0083] Among them, the above setting enables the DCDC module 21 to draw power from either the external communication power supply 1 or the battery cell 23, and the dual power supply method improves the flexibility and reliability of the system.

[0084] During the operation of the battery management system BMS, when the external communication power supply 1 is available, it can be used to supply power to it; while when the external communication power supply 1 is unavailable or fails, the battery cell 23 for storing electrical energy can be used as a backup power supply to ensure the continuous operation of the BMS.

[0085] Furthermore, the low-voltage activation and remedy control method for the energy storage battery system further includes: real-time detecting the voltage of the battery PACK2, and if the voltage of the battery PACK2 is less than the starting voltage, it is determined that the battery PACK2 is in a low-voltage state and cannot be started.

[0086] In this embodiment, by real-time detecting the voltage of the battery PACK2, it is possible to timely discover and take measures when the voltage is lower than the starting voltage, avoid problems such as inability to start or operation failure caused by low voltage, avoid over-discharging of the battery PACK2, and extend the service life of the battery PACK2.

[0087] On the other hand, the present invention also provides an energy storage battery system 10 for implementing the low-voltage activation remedy control method of the energy storage battery system according to any one of the above, and the energy storage battery system 10 may include an external communication power supply 1 and a battery PACK2. Among them, the external communication power supply 1 and the battery PACK2 are used to charge and discharge the battery PACK2.

[0088] The external communication power supply 1 may be a DC power supply with communication or an energy storage power conversion system PCS. Selecting a DC power supply with communication function or an energy storage power conversion system PCS as the external communication power supply 1 can meet the requirements of all application scenarios.

[0089] Among them, selecting a DC power supply with communication function as the external communication power supply 1 can provide a stable voltage output. In addition, the DC power supply usually supports a wide input voltage range and can adapt to different grid conditions. Selecting an energy storage power conversion system PCS as the external communication power supply 1 can realize the bidirectional conversion between direct current and alternating current, which can be used for both charging and discharging, improving the flexibility of the system.

[0090] Reference Figure 3 、 Figure 4 , the battery PACK2 may include a battery management system BMS and battery cells 23 connected to the battery management system BMS. Among them, the battery cells 23 are used to store electric energy, and the battery management system BMS is used to monitor and protect the battery cells 23 and communicate with the external communication power supply 1.

[0091] Specifically, the battery cells 23 are electrically connected to the external communication power supply 1 through the main circuit. Among them, a pre-charge circuit is provided on the main circuit. Through the cooperation of the pre-charge resistor R1 and the pre-charge switch K1, the pre-charge circuit can limit the magnitude of the current at the initial stage of charging, avoid the instantaneous large current impact caused by voltage difference, and improve the safety and reliability of the charging process.

[0092] By setting the pre-charge circuit, the battery cells 23, the external communication power supply 1 and the switching devices can be effectively protected, preventing damage due to overcurrent and prolonging the service life of the battery cells 23, the external communication power supply 1 and the switching devices.

[0093] Continue to refer to Figure 3 、 Figure 4 , the battery management system BMS may include a communication module 24, and the communication module 24 is communicatively connected to the external communication power supply 1.

[0094] Among them, the communication module 24 may be a CAN communication module 24 or a 485 communication module 24. The present application does not limit the communication method of the communication module 24.

[0095] The battery management system BMS may include a DCDC module 21, and the DCDC module 21 is connected to the battery cell 23 and the external communication power supply 1. Among them, the DCDC module 21 is used to connect to the external communication power supply 1 and perform charging remedy for the battery PACK2 when the battery PACK2 is in a low-voltage inoperable state.

[0096] In this embodiment, by means of the DCDC module 21 in the battery management system BMS, when the battery PACK2 is in a low-voltage inoperable state, the DCDC module 21 is connected to the external communication power supply 1 to directly charge the battery PACK2 quickly, ensuring that the battery management system BMS can be started and operated normally, and improving the usage reliability of the energy storage battery system 10.

[0097] Further, continuing to refer to Figure 3 、 Figure 4 The battery management system BMS may include a sampling module 25. The sampling module 25 is connected to the battery PACK2 and is used to detect the voltage, charging current, and discharging current of the battery PACK2 in real time.

[0098] Among them, the sampling module 25 may be an AFE (analog front end), that is, an analog front end, which specifically refers to a battery sampling chip in the BMS and is used to collect the voltage, current, temperature, etc. of the battery. The sampling module 25 may also be a separate current sampling circuit and voltage sampling circuit.

[0099] The battery management system BMS may include a control module 26. The control module 26 serves as the control center of the BMS and may be an MCU.

[0100] The control module 26 is connected to the sampling module 25, the communication module 24, and the DCDC module 21. Among them, the starting voltage is stored in the control module 26. The control module 26 can obtain the battery information detected by the sampling module 25, control the communication with the external communication power supply 1, and also issue control instructions for closing and opening the main circuit and the pre-charge circuit.

[0101] If the voltage of the battery PACK2 detected by the sampling module 25 is lower than the starting voltage, the control module 26 controls the battery management system BMS to execute the low-voltage activation remedy control method.

[0102] In this embodiment, the sampling module 25 is used to detect the voltage, charging current, and discharging current of the battery PACK2 in real time, providing accurate data support for the BMS. The control module 26 judges the battery state based on these data and automatically executes the low-voltage activation remedy control logic when the voltage is lower than the starting voltage, realizing precise control and significantly improving the safety and reliability of the energy storage battery system 10.

[0103] Further, the battery management system BMS may include a driving module 27, which is used to drive the main circuit and the pre-charge circuit to be turned on or off.

[0104] Among them, the driving module 27 is connected to the control module 26 and is used to drive the main circuit and the pre-charge circuit to be turned on or off according to the control instruction issued by the control module 26.

[0105] In this embodiment, by setting the driving module 27, the on-off state of the main circuit and the pre-charge circuit can be accurately controlled, ensuring that the on-off operation of the circuit meets the safety requirements under the low-voltage state.

[0106] Refer to Figure 5 , taking the external communication power supply 1 as the PCS and the energy storage battery system 10 as Figure 1 as an example, the low-voltage activation and remedy control logic includes: the PCS power supply provides the output voltage V4, the DCDC module 21 starts, the MCU wakes up, the communication module 24 starts, applies to the PCS for the charging voltage V1 and the current I1, turns on the negative switch K3, and starts charging. It is judged whether the voltage of the battery PACK2 is greater than or equal to V2. If so, it requests the PCS to stop charging. At this time, the positive switch K2 is closed, the pre-charge switch K1 is opened, applies to the PCS for the new charging voltage V3 and the current I3, and enters the normal charging logic until the charging remedy ends.

[0107] The above are only the preferred embodiments of the present invention, and are not limitations on the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A low voltage activation remediation control method for an energy storage battery system, characterized in that: The control method comprises the following steps: When the battery PACK is in a low voltage and cannot be started state, the output voltage of the external communication power supply is adjusted to a first preset value V4, and a low voltage greater than the starting voltage is provided to the DCDC module to start the DCDC module and wake up the battery management system BMS; The battery management system BMS applies for a charging voltage V1 and a current I1 from the external communication power supply; the pre-charging circuit of the battery PACK is turned on, so that the pre-charging resistor is connected to the main charging circuit. At this time, the output voltage V1 of the external communication power supply is equal to the sum of the voltage on the pre-charging resistor and the voltage of the battery PACK, and the battery PACK is charged with the current I1; When the voltage of the battery PACK reaches a second preset value V2, charging is stopped and the control enters the normal charging logic until the charging remediation is completed; wherein the voltage V2 of the battery PACK supports the normal operation of the battery management system BMS.

2. The energy storage battery system low voltage activation remediation control method according to claim 1, characterized in that: Also includes: If the voltage of the battery PACK is less than the second preset value V2, the external communication power supply is controlled to continue charging the battery PACK with the current I1 until the voltage of the battery PACK reaches the second preset value V2 and the charging is stopped.

3. The energy storage battery system low voltage activation remediation control method according to claim 1 or 2, characterized in that: Entering normal charging logic includes: Opening the main circuit of the charging and disconnecting the pre-charging circuit; The battery management system BMS applies for a new charging voltage V3 and current I3 from the external communication power supply, and the external communication power supply charges the battery PACK with the charging voltage V3 and current I3.

4. The energy storage battery system low voltage activation remediation control method according to claim 1, characterized in that: The pre-charging circuit includes a branch formed by connecting the pre-charging resistor and the pre-charging switch in series, and the branch is connected in parallel with one of the positive switch and the negative switch of the main circuit; The pre-charging circuit of the battery PACK is turned on and includes: The pre-charging switch and the other of the positive switch and the negative switch are closed sequentially to conduct the pre-charging loop.

5. The energy storage battery system low voltage activation remediation control method according to claim 1, characterized in that: The DCDC module is electrically connected to the external communication power supply and the battery cells of the battery PACK, and is used to supply power to the battery management system BMS.

6. The energy storage battery system low voltage activation remediation control method according to claim 1, characterized in that: Also includes: The voltage of the battery PACK is detected in real time. If the voltage of the battery PACK is less than the starting voltage, it is determined that the battery PACK is in a low voltage and cannot be started state.

7. An energy storage battery system, used to implement the low voltage activation remediation control method described in any one of 1 to 6, characterized in that: include: External communication power supply; A battery PACK, comprising a battery management system BMS and a battery cell, wherein the battery cell is electrically connected to the external communication power supply through a main circuit, and a pre-charging circuit is provided on the main circuit; The battery management system BMS comprises: A communication module, communicatively connected to the external communication power supply; A DCDC module is connected to the battery cell and the external communication power supply. The DCDC module is used to connect to the external communication power supply and charge the battery PACK when the battery PACK is in a low voltage and cannot be started state.

8. The energy storage battery system according to claim 7, characterized in that: The battery management system further comprises: A sampling module, connected to the battery PACK, for detecting the voltage, charging current, and discharging current of the battery PACK in real time; A control module is connected to the sampling module, the communication module and the DCDC module. A starting voltage is stored in the control module. If the voltage of the battery PACK detected by the sampling module is lower than the starting voltage, the control module controls the battery management system BMS to execute the low voltage activation remedial control method.

9. The energy storage battery system according to claim 7 or 8, characterized in that: The battery management system further includes: a driving module, which is used to drive the main circuit and the pre-charging circuit to be turned on or off.

10. The energy storage battery system according to claim 7, characterized in that: The external communication power supply is a DC power supply with communication or an energy storage power conversion system PCS.

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