A method for energy storage batteries to protect themselves during earthquakes

Abstract

This application discloses a method for self-protection of energy storage batteries during earthquakes, relating to the field of new energy technology. The method includes the following steps: monitoring the water level status in a water level monitoring device through a digital input switch, classifying the severity level based on the water level status and different water surface tilt states, thereby obtaining water surface tilt state information as first information; transmitting the first information obtained in step S1 to a battery management system via signal transmission; the battery management system outputs a corresponding protection signal according to the severity level of the first information collected in step S1, driving the protection circuit to work; after the protection circuit completes its protection work, the battery management system determines different system recovery conditions based on the severity level; the technical solution provided in this application fills the gap in the fields of energy storage batteries detecting seismic signals during earthquakes and adopting protection strategies during earthquakes.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a method for self-protection of energy storage batteries during earthquakes. Background Technology

[0002] Energy storage batteries already have comprehensive protection mechanisms for voltage and temperature, but research in this area is relatively limited on how to enable energy storage batteries to acquire earthquake information at low cost during earthquakes, and what control logic to adopt based on the earthquake information.

[0003] Currently, vibration detection devices on the market are not highly compatible with energy storage batteries, making it difficult to use them in energy storage battery systems at low cost. For example, gyroscopes often require a separate gyroscope chip to collect vibration information, and then the gyroscope chip transmits the vibration information to the mobile phone SOC. For these reasons, when an earthquake occurs, manual intervention is required to shut down the battery, but human intervention is inevitably prone to oversights or being unable to arrive in time due to distance from the scene. Summary of the Invention

[0004] The purpose of this application is to provide a method for self-protection of energy storage batteries during earthquakes, in order to solve at least one of the above-mentioned technical problems.

[0005] To address the aforementioned technical problems, this application provides a method for self-protection of energy storage batteries during earthquakes. The method is based on a protection circuit, which includes a battery pack, a circuit breaker, a relay, an inverter, a battery management system, and a water level monitoring device.

[0006] Among them, the positive terminal of the battery pack is connected to the circuit breaker, the circuit breaker is connected to the positive terminal of the relay, the first high-side switch of the battery management system is connected to the relay, the second high-side switch is connected to the circuit breaker, the positive terminal of the inverter is connected to the relay, the negative terminal is connected to the battery pack, the inverter is also connected to the CAN terminal of the battery management system, and the water level monitoring device is connected to the battery management system.

[0007] The method includes the following steps:

[0008] S1. Monitor the water level status in the water level monitoring device through a digital input switch, and classify the severity level according to different water surface tilt states based on the water level status, thereby obtaining water surface tilt state information and using it as the first information.

[0009] S2. The first information obtained in step S1 is transmitted to the battery management system via signal transmission.

[0010] S3. The battery management system outputs a protection signal corresponding to the severity level of the first information collected in step S1, thereby driving the protection circuit to work.

[0011] S4. After the protection circuit completes its protection work, the battery management system determines different system recovery conditions based on the severity level.

[0012] Preferably, the severity level of the first information includes mild, moderate, and severe.

[0013] Preferably, the protection circuit further includes a display screen and an alarm device connected to the battery management system;

[0014] In cases where the severity level is minor, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm equipment to start, and simultaneously uploads alarm signals and charge / discharge prohibition commands to the inverter or the EMS of the battery pack and inverter, without forcibly interrupting relays and circuit breakers.

[0015] Preferably, the protection circuit further includes a display screen and an alarm device connected to the battery management system;

[0016] In cases of moderate severity, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm device to start, stops the power supply to the relay via the first high-side switch, interrupts the battery pack's external voltage output by cutting off the relay, and uploads a serious fault flag bit to the inverter or simultaneously controls the EMS of both the battery pack and the inverter.

[0017] Preferably, the protection circuit further includes a display screen and an alarm device connected to the battery management system;

[0018] In cases of severe severity, the battery management system transmits alarm information to the display screen via MODBUS signals, activates alarm devices, stops the power supply to the relay via the first high-side switch, interrupts the battery pack's external voltage output by disconnecting the relay, and causes the circuit breaker or air switch to trip, thereby disconnecting the connection between the battery pack and the battery control system; if there is also a circuit breaker between the battery pack and the inverter, it will immediately trip.

[0019] Preferably, in step S4, based on the case of a minor severity level, a system recovery time is set. After the protection measures have elapsed through the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device.

[0020] Preferably, in step S4, based on the case of a medium severity level, a system recovery time is set. After the protection measures have passed the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device. The battery management system attempts to perform a self-test and power-on process, using the second high-side switch to drive the relay to engage, thereby restoring the battery's external voltage output.

[0021] Preferably, in step S4, based on the severity level being severe, a system recovery time is set. After the protection measures have passed the system recovery time, the battery management system no longer attempts to trip the circuit breakers and air switches. At this time, through manual intervention, the tripped circuit breakers and air switches are reset and reopened. After detecting that the circuit breakers and air switches have been opened, the battery management system attempts to perform a self-test and power-on process again, using the second high-side switch to drive the relay to engage, thereby restoring the battery's external voltage output.

[0022] Preferably, the water level monitoring device includes a container body and several digital input switches;

[0023] The container body contains liquid, and a number of digital input switches are provided on the inner wall of the container body. The digital input switches are connected to the battery management system.

[0024] Preferably, the liquid within the container body is suitable for dissolving the conductivity enhancer;

[0025] The conductivity enhancer includes a salt.

[0026] Compared with the prior art, the beneficial effects of this application are as follows:

[0027] (1) It fills the gaps in the fields of energy storage batteries detecting seismic signals during earthquakes and what protection strategies to adopt during earthquakes;

[0028] (2) A simple and low-cost vibration detection device is adopted, which can transmit vibration signals to the battery management system in different levels through a digital switch without the need to add chips or adopt a dedicated communication protocol.

[0029] (3) It minimizes the possibility of human intervention and balances the relationship between accidental triggering and human intervention in scenarios where the energy storage battery is located in a remote warehouse in an earthquake zone. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a circuit state diagram of one embodiment of this application;

[0032] Figure 2 This is a circuit state diagram of one embodiment of this application;

[0033] Figure 3 This is a circuit state diagram of one embodiment of this application;

[0034] Figure 4 This is a circuit state diagram of one embodiment of this application. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" 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, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are 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, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0040] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0041] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0042] While energy storage batteries already possess comprehensive protection mechanisms against voltage and temperature fluctuations, research on how to enable them to acquire earthquake information at low cost during earthquakes, and what control logic to employ based on this information, is relatively limited. Currently available vibration detection devices are not highly compatible with energy storage batteries, making them difficult to use in energy storage systems at low cost. For example, gyroscopes often require a separate gyroscope chip to collect vibration information, which is then transmitted to the mobile phone's SOC. Due to these reasons, manual intervention is necessary to shut down the battery during an earthquake, but human intervention is prone to oversights or delays due to distance. To address these technical problems, this embodiment provides the following technical solution:

[0043] For details, please see Figure 1-4 This application provides a method for self-protection of energy storage batteries during earthquakes. This method is based on a protection circuit. Please refer to [link to relevant documentation]. Figure 1 In one embodiment, the protection circuit includes a battery pack, a circuit breaker, a relay, an inverter, a battery management system, and a water level monitoring device.

[0044] Among them, the positive terminal of the battery pack is connected to the circuit breaker, the circuit breaker is connected to the positive terminal of the relay, the first high-side switch of the battery management system is connected to the relay, the second high-side switch is connected to the circuit breaker, the positive terminal of the inverter is connected to the relay, the negative terminal is connected to the battery pack, the inverter is also connected to the CAN terminal of the battery management system, and the water level monitoring device is connected to the battery management system.

[0045] Specifically, the method includes the following steps:

[0046] S1. Monitor the water level status in the water level monitoring device through a digital input switch, and classify the severity level according to different water surface tilt states based on the water level status, thereby obtaining water surface tilt state information and using it as the first information.

[0047] S2. The first information obtained in step S1 is transmitted to the battery management system via signal transmission.

[0048] S3. The battery management system outputs a protection signal corresponding to the severity level of the first information collected in step S1, thereby driving the protection circuit to work.

[0049] S4. After the protection circuit completes its protection work, the battery management system determines different system recovery conditions based on the severity level.

[0050] Furthermore, in one embodiment, the severity level of the first information includes mild, moderate, and severe; it is understood that in other embodiments, two, four, or more levels may be defined depending on the actual situation.

[0051] Specifically, the protection circuit also includes a display screen and alarm devices connected to the battery management system;

[0052] Alarm equipment includes alarm mechanisms such as audible and visual alarms.

[0053] Specifically, in cases where the severity level is minor, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm equipment to start, and simultaneously uploads alarm signals and charge / discharge prohibition commands to the inverter or the EMS of the battery pack and inverter, without forcibly interrupting relays and circuit breakers.

[0054] Specifically, in cases of moderate severity, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm device to start, stops the power supply to the relay via the first high-side switch, interrupts the battery pack's external voltage output by cutting off the relay, and uploads a serious fault flag bit to the inverter or simultaneously controls the EMS of both the battery pack and the inverter.

[0055] Specifically, in cases of severe severity, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm device to start, stops the power supply to the relay through the first high-side switch, interrupts the voltage output of the battery pack to the outside by disconnecting the relay, and causes the circuit breaker or air switch to trip, thereby disconnecting the connection between the battery pack and the battery control system; if there is also a circuit breaker between the battery pack and the inverter, it will be tripped immediately.

[0056] Furthermore, in step S4, based on the case of a minor severity level, a system recovery time is set. After the protection measures have elapsed through the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device.

[0057] Furthermore, in step S4, based on the case of a moderate severity level, a system recovery time is set. After the protection measures have elapsed for the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device. The battery management system attempts to perform a self-test and power-on process, using the second high-side switch to drive the relay to engage, thereby restoring the battery's external voltage output.

[0058] Furthermore, in step S4, based on the severity level being severe, a system recovery time is set. After the protection measures have passed the system recovery time, the battery management system no longer attempts to trip the circuit breakers and air switches. At this time, through manual intervention, the tripped circuit breakers and air switches are reset and reopened. After detecting that the circuit breakers and air switches have been opened, the battery management system attempts to perform a self-test and power-on process again, using the second high-side switch to drive the relay to engage, thereby restoring the battery's external voltage output.

[0059] In the above scheme, recovery conditions for minor and moderate earthquakes at the severe level do not require manual intervention, while recovery conditions for severe earthquakes require manual intervention. The difference between minor and moderate earthquakes is that minor earthquakes allow for a short period of recovery after protection is triggered to avoid serious consequences from false triggers, while moderate earthquakes do not allow for a short period of recovery after protection is triggered to avoid the adverse effects of repeated triggering and forced disconnection of the relay on the battery. This scheme employs different energy storage battery protection and recovery strategies according to the severity level. In the case of a minor earthquake, it avoids damage to the battery by cutting off the circuit as much as possible while ensuring safety. In the case of a moderate earthquake, it adopts protection measures that cut off the circuit but can recover automatically to reduce the need for subsequent manual intervention. In the case of a severe earthquake, it adopts protection measures that cannot recover automatically to ensure that the circuit is checked manually for serious damage.

[0060] Specifically, the water level monitoring device includes a container body;

[0061] Furthermore, the container body contains liquid, and several digital input switches are provided on the inner wall of the container body. These digital input switches are connected to the battery management system.

[0062] Specifically, the liquid inside the container is suitable for dissolving the conductivity enhancer;

[0063] In some implementations, the conductivity enhancer includes a salt.

[0064] In the above scheme, the sensitivity of the acquired signal is enhanced by dissolving a conductivity enhancer in the liquid to increase the conductivity of the water. This can prevent the digital input switch of the battery management system from failing to detect the earthquake warning signal in time due to the high resistance of the water.

[0065] The following describes the specific implementation methods in further detail:

[0066] Example 1

[0067] Please see Figure 1 The water level in the device is at Figure 1 In this state, none of the three scales indicating the degree of water vibration are submerged by the water surface. At this time, the three preset digital input switches DI1, DI2, and DI3 of the battery management system cannot read the circuit conduction information. Therefore, the system considers everything to be normal and does not take any measures.

[0068] Example 2

[0069] During a minor earthquake, the water level in the device is at... Figure 2 In this state, the "slight" scale indicating the degree of water vibration is submerged by the water level. At this time, the battery management system detects that the circuit between the DI1 and GND ports is conducting, thus determining that it is in a "slight earthquake" fault. The battery management system then uploads the "no charging / discharging" command and "alarm signal" to the inverter (PCS) or the energy management system (EMS) that controls both the battery and the inverter (PCS) to bring the current in the circuit to zero. No other measures are taken.

[0070] Example 3

[0071] During a moderate earthquake, the water level in the device was at... Figure 3 In this state, the "medium" scale indicating the degree of water vibration is submerged by the water level. At this time, the battery management system detects that the circuit between the DI2 and GND ports is conducting, thus determining that it is in a "moderate earthquake" fault. At this time, the battery management system uploads the "no charging and no discharging" command and "protection signal" to the inverter (PCS) or the energy management system (EMS) that controls both the battery and the inverter (PCS) to bring the current in the circuit to zero. At the same time, the power-down process begins. Within 1 to 3 seconds, the main circuit relay should be cut off by stopping the power supply to the high-side switch 1 to prevent the energy storage battery from continuing to output voltage.

[0072] Example 4

[0073] During a severe earthquake, the water level in the device is at... Figure 4In this state, the "severe" scale indicating the degree of water vibration is submerged by the water level. At this time, the battery management system detects that the circuit between the DI3 and GND ports is conducting, thus determining that it is in a "severe earthquake" fault. At this time, the battery management system uploads the "no charging and no discharging" command and the "protection signal" to the inverter (PCS) or the energy management system (EMS) that controls both the battery and the inverter (PCS) to bring the current in the circuit to zero. At the same time, the power-down process begins. Within 1 to 3 seconds, the relay should be cut off by stopping the power supply to the high-side switch 1 to prevent the energy storage from continuing to output voltage. Then, the high-side switch 2 is briefly energized to drive the circuit breaker to trip.

[0074] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application shall fall within the scope of the technical solution of this application.

Claims

1. A method for self-protection of energy storage batteries during earthquakes, characterized in that: The method is based on a protection circuit, which includes a battery pack, a circuit breaker, a relay, an inverter, a battery management system, and a water level monitoring device. Among them, the positive terminal of the battery pack is connected to the circuit breaker, the circuit breaker is connected to the positive terminal of the relay, the first high-side switch of the battery management system is connected to the relay, the second high-side switch is connected to the circuit breaker, the positive terminal of the inverter is connected to the relay, the negative terminal is connected to the battery pack, the inverter is also connected to the CAN terminal of the battery management system, and the water level monitoring device is connected to the battery management system. The method includes the following steps: S1. Monitor the water level status in the water level monitoring device through a digital input switch, and classify the severity level according to different water surface tilt states based on the water level status, thereby obtaining water surface tilt state information and using it as the first information. S2. The first information obtained in step S1 is transmitted to the battery management system via signal transmission. S3. The battery management system outputs a protection signal corresponding to the severity level of the first information collected in step S1, thereby driving the protection circuit to work. S4. After the protection circuit completes its protection work, the battery management system determines different system recovery conditions based on the severity level.

2. The method for self-protection of energy storage batteries during earthquakes according to claim 1, characterized in that: The severity levels of the first information include mild, moderate, and severe.

3. The method for self-protection of energy storage batteries during earthquakes according to claim 2, characterized in that: The protection circuit also includes a display screen and an alarm device connected to the battery management system; In cases where the severity level is minor, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm equipment to start, and simultaneously uploads alarm signals and charge / discharge prohibition commands to the inverter or the EMS of the battery pack and inverter, without forcibly interrupting relays and circuit breakers.

4. The method for self-protection of energy storage batteries during earthquakes according to claim 2, characterized in that: The protection circuit also includes a display screen and an alarm device connected to the battery management system; In cases of moderate severity, the battery management system transmits alarm information to the display screen via MODBUS signals, controls the alarm device to start, stops the power supply to the relay via the first high-side switch, interrupts the battery pack's external voltage output by cutting off the relay, and uploads a serious fault flag bit to the inverter or simultaneously controls the EMS of both the battery pack and the inverter.

5. The method for self-protection of energy storage batteries during earthquakes according to claim 2, characterized in that: The protection circuit also includes a display screen and an alarm device connected to the battery management system; In cases where the severity level is critical, the battery management system transmits alarm information to the display screen via MODBUS signal, controls the alarm device to start, stops the power supply to the relay through the first high-side switch, interrupts the voltage output of the battery pack to the outside by disconnecting the relay, and causes the circuit breaker or air switch to trip, thereby disconnecting the connection between the battery pack and the battery control system. If there is also a circuit breaker between the battery pack and the inverter, trip it immediately.

6. The method for self-protection of energy storage batteries during earthquakes according to claim 3, characterized in that: In step S4, based on the case of a minor severity level, a system recovery time is set. After the protection measures have elapsed for the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device.

7. The method for self-protection of energy storage batteries during earthquakes according to claim 4, characterized in that: In step S4, based on the condition that the severity level is medium, a system recovery time is set. After the protection measures have passed the system recovery time, the battery management system stops uploading alarm information to the inverter and stops the alarm device. The battery management system attempts to perform a self-test and power-on process, and drives the relay to engage by powering on the second high-side switch, thereby restoring the battery's external voltage output.

8. The method for self-protection of energy storage batteries during earthquakes according to claim 5, characterized in that: In step S4, based on the severity level being severe, a system recovery time is set. After the protection measures have passed the system recovery time, the battery management system no longer attempts to trip the circuit breakers and air switches. At this time, through manual intervention, the tripped circuit breakers and air switches are reset and reopened. After detecting that the circuit breakers and air switches have been opened, the battery management system attempts to perform a self-test and power-on process again. The relay is activated by powering the second high-side switch, thereby restoring the battery's external voltage output.

9. The method for self-protection of an energy storage battery during an earthquake according to any one of claims 1-8, characterized in that: The water level monitoring device includes a container body and several digital input switches; The container body contains liquid, and the digital input switch is connected to the battery management system.

10. The method for self-protection of energy storage batteries during earthquakes according to claim 9, characterized in that: The liquid inside the container body is suitable for dissolving the conductivity enhancer; The conductivity enhancer includes a salt.

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