Energy storage battery safety protection method, device, equipment, storage medium and program product

Abstract

This application relates to a safety protection method, device, equipment, storage medium and program product for energy storage batteries. The method is applied to an energy storage battery safety protection system, which includes a battery compartment, an inert gas generator and an environmental parameter detector. The method includes: filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment; setting the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset initial environmental parameter value range; and issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter value in the battery compartment exceeds the preset working environmental parameter value range. Using this method can reduce the safety risk of energy storage batteries.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular, to a method, device, equipment, storage medium and program product for protecting the safety of energy storage batteries. Background Art

[0002] With the rapid development of new energy technologies, the production and sales volume of lithium-ion batteries are getting higher and higher. There are also more and more lithium-ion batteries entering the service period and even the retirement period. The cascaded utilization of power batteries has become a key task that the lithium battery industry in China must solve. Energy storage power stations are a major scenario for the cascaded utilization of power batteries. However, the current application of cascaded utilization batteries in the energy storage field in China is still relatively limited. The main reason is that the safety hazards of lithium-ion batteries are relatively high, and they are prone to thermal runaway and spontaneous combustion. And as the service time of the battery extends, the risk of thermal runaway of the battery increases significantly.

[0003] In traditional technologies, an active safety protection method is usually adopted. A strict monitoring network is formed by using big data and algorithm models to give early warnings and make treatments before the battery catches fire or undergoes spontaneous combustion. At the same time, fire-fighting equipment is equipped for energy storage batteries as a passive protection means.

[0004] However, the process of battery ignition and spontaneous combustion is usually extremely rapid, and the temperature can rise by several hundred degrees within ten seconds or so. The active safety protection method usually has difficulty in accurately identifying and responding within such a short time, resulting in a relatively high probability of risk occurrence. The passive protection means can only control the scope of risk occurrence as much as possible and reduce the losses after the risk occurs, but cannot prevent the occurrence of risks. That is to say, the traditional safety protection method still has relatively high safety risks. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a method, device, equipment, storage medium and program product for protecting the safety of energy storage batteries that can reduce the safety risks of energy storage batteries.

[0006] In a first aspect, the present application provides a method for protecting the safety of energy storage batteries, which is applied to an energy storage battery safety protection system. The energy storage battery safety protection system includes a battery compartment, an inert gas generator and an environmental parameter detector. The method includes:

[0007] Filling an inert gas into the battery compartment through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment;

[0008] When it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset range of the initial environmental parameter value, setting the energy storage battery to the working state;

[0009] When the working environment parameter value in the battery compartment detected by the environmental parameter detector exceeds the preset range of the working environment parameter value, a first safety alarm is issued.

[0010] In a second aspect, the present application further provides an energy storage battery safety protection device, which is applied to an energy storage battery safety protection system. The energy storage battery safety protection system includes a battery compartment, an inert gas generator, and an environmental parameter detector. The device includes:

[0011] An inflation module for filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment;

[0012] A detection module for setting the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset range of the initial environmental parameter value;

[0013] An alarm module for issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter value in the battery compartment exceeds the preset range of the working environmental parameter value.

[0014] In a third aspect, the present application further provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0015] Filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment;

[0016] Setting the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset range of the initial environmental parameter value;

[0017] Issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter value in the battery compartment exceeds the preset range of the working environmental parameter value.

[0018] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0019] Filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment;

[0020] Setting the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset range of the initial environmental parameter value;

[0021] When the working environmental parameter value in the battery compartment detected by the environmental parameter detector exceeds the preset range of the working environmental parameter value, a first safety alarm is issued.

[0022] In a fifth aspect, the present application further provides a computer program product, including a computer program, which when executed by a processor implements the following steps:

[0023] Fill the battery compartment with inert gas through an inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment;

[0024] When the initial environmental parameter value detected by the environmental parameter detector exceeds the preset range of the initial environmental parameter value, set the energy storage battery to the working state;

[0025] When the working environmental parameter value in the battery compartment detected by the environmental parameter detector exceeds the preset range of the working environmental parameter value, a first safety alarm is issued.

[0026] For the above energy storage battery safety protection method, device, equipment, storage medium and program product, first, fill the battery compartment with inert gas through an inert gas generator, so that the energy storage battery is in an inert gas environment; furthermore, when the initial environmental parameter value detected by the environmental parameter detector exceeds the preset range of the initial environmental parameter value, set the energy storage battery to the working state. In this way, the energy storage battery works in an inert atmosphere. Even if the temperature of the energy storage battery reaches the ignition point during the working process, since the inert gas cannot burn, the energy storage battery will not catch fire, self-ignite, etc. Therefore, the risks of fire, self-ignition, etc. can be prevented from the source, effectively reducing the harm and losses suffered by the energy storage battery itself and other items and personnel; synchronously, the working environmental conditions of the environment in the battery compartment can also be monitored through the environmental parameter detector during the working process of the energy storage battery. When the working environmental parameter value in the battery compartment exceeds the preset range of the working environmental parameter value, a first safety alarm is issued, so that relevant objects can process it in time and reduce the safety risks of the energy storage battery. In this way, since the fire risk of the energy storage battery is relatively low, the service life of the battery can be extended, the full cascade utilization of old batteries is realized, which is conducive to promoting the recycling of batteries and the development of the energy storage industry. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments of the present application or related technologies. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0028] Figure 1 is a schematic flowchart of a method for protecting the safety of an energy storage battery in an embodiment;

[0029] Figure 2 is a schematic diagram of the component modules of a safety protection device for an energy storage battery in an embodiment;

[0030] Figure 3 is a schematic diagram of the component modules of a safety protection device for an energy storage battery provided with multiple inert gas detection groups in an embodiment;

[0031] Figure 4 is a schematic flowchart of a method for protecting the safety of an energy storage battery in another embodiment;

[0032] Figure 5 is a schematic diagram of the component modules of a safety protection device for an energy storage battery in another embodiment;

[0033] Figure 6 is a structural block diagram of a safety protection device for an energy storage battery in an embodiment;

[0034] Figure 7 is an internal structure diagram of a computer device in an embodiment. Detailed implementation manners

[0035] In order to make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] In an exemplary embodiment, as Figure 1 shown, a method for protecting the safety of an energy storage battery is provided. In this embodiment, the method is exemplified by being applied to a terminal. Among them, the terminal can be, but is not limited to, various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, projection devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. It can be understood that this method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is realized through the interaction between the terminal and the server.

[0037] In this embodiment, the method is applied to an energy storage battery safety protection system. The energy storage battery safety protection system includes a battery compartment, an inert gas generator, and an environmental parameter detector. The method includes the following steps S10-S30. Among them:

[0038] Step S10: Fill the battery compartment with inert gas through an inert gas generator, where the inert gas is used to regulate the initial environmental parameter values in the battery compartment.

[0039] Among them, the energy storage battery safety protection system refers to a system for passive safety and / or active safety protection of the energy storage battery. For example, Figure 2 As shown, the energy storage battery safety protection system at least includes a battery compartment 102, an inert gas generator 104, and an environmental parameter detector 106.

[0040] The battery compartment 102 refers to a housing structure for placing the energy storage battery. As an example, the battery compartment 102 is a sealable battery compartment 102. A sealable battery compartment 102 means a battery compartment 102 that can be sealed. It can be understood that openings such as doors, pipe openings, and channels communicating with the outside can be provided on the housing of the battery compartment 102. By setting opening and closing control devices, such as switches, gates, and valves, at the openings, the sealing state of the battery compartment 102 can be regulated.

[0041] The inert gas generator 104 refers to a device capable of transmitting inert gas to the outside. The inert gas generator 104 is connected to the battery compartment 102, so that the inert gas can be filled into the battery compartment 102. The number of inert gas generators 104 can be one or more. The inert gas is usually compressed and stored in the inert gas generator 104. The compressed inert gas can be liquid. When the compressed inert gas is released, it usually has properties such as high pressure, low temperature and inertness. Environmental parameters such as ambient air pressure, ambient temperature and gas composition in the battery compartment 102 can be regulated. As an example, the inert gas can be nitrogen. The inert gas generator 104 may be provided with at least one of an inert gas storage unit, an inert gas preparation unit and an inert gas acquisition unit, wherein the inert gas storage unit has the function of storing inert gas, and the inert gas generator 104 can transfer the inert gas stored in the inert gas storage unit to the battery compartment 102; the inert gas preparation unit has the function of preparing inert gas, and the inert gas generator 104 can transfer the inert gas prepared by the inert gas preparation unit to the battery compartment 102; the inert gas acquisition unit has the function of transmitting inert gas, and the inert gas generator 104 can obtain inert gas from other inert gas preparation devices through the inert gas acquisition unit, thereby transmitting the obtained inert gas to the battery compartment 102. It is understandable that during the use of the energy storage battery, the inert gas generator 104 can be turned on all the time, turned on at a fixed time, or turned on in a triggered manner. That is, before the energy storage battery is used, the inert gas generator 104 can be turned on first, the atmosphere in the battery compartment 102 can be adjusted to the required inert gas environment, and then the energy storage battery can be enabled. After the energy storage battery is enabled, the inert gas generator 104 can be turned off or not. After turning off the inert gas generator 104, the inert gas generator 104 can also be turned on in a fixed time or in a triggered manner.

[0042] The environmental parameter detector 106 refers to a device for monitoring the values of working environmental parameters. The number of environmental parameter detectors 106 can be one or more. As an example, the environmental parameter detector 106 may include a detector body and a data acquisition device. Exemplarily, the data acquisition device may be a sensor. Among them, the data acquisition device is arranged in the battery compartment 102 for acquiring the values of the working environmental parameters of the environment in the battery compartment 102. The data acquisition device is communicatively connected to the detector body by wired or wireless means, so as to send the acquired values of the working environmental parameters to the detector body. The detector body can be arranged in the battery compartment 102 or outside the battery compartment 102. As an example, the detector body may be a management terminal arranged on the outer side of the housing of the battery compartment 102 or the user terminal of the management staff. As an example, the environmental parameter detector 106 may further include an alarm. When the detector body detects that the value of the working environmental parameter is not within the preset range of the working environmental parameter values, it sends an alarm instruction to the alarm. The alarm issues a safety alarm in response to the alarm instruction to attract the attention of relevant personnel and timely handle the possible risks.

[0043] Exemplarily, after detecting that the battery compartment enters the sealed state from the non-sealed state, the inert gas generator can be started, and inert gas is filled into the battery compartment through the inert gas generator. By filling inert gas, a suitable working environmental condition is provided for the energy storage battery in the battery compartment. Among them, the suitable working environmental condition can be determined according to the actual situation, test results, etc., and this embodiment does not limit this.

[0044] As an example, the opening and closing states of each opening on the housing of the battery compartment can be monitored. If it is detected that any one or more openings are in the open state, it can be determined that the battery compartment is in the non-sealed state. If it is detected that all openings are in the closed state, it can be determined that the battery compartment is in the sealed state. When the battery compartment is in the non-sealed state, gas exchange occurs inside and outside the battery compartment, and air outside the battery compartment or combustible gas of other non-inert gases may enter the battery compartment, posing a safety hazard. Therefore, after the battery compartment re-enters the sealed state, inert gas needs to be refilled into the battery compartment. For example, a door can be opened on the housing of the battery compartment. Relevant personnel, robots or conveying devices can put energy storage batteries into the battery compartment or take out energy storage batteries from the battery compartment through the door. After each operation is completed and when leaving the battery compartment, the door needs to be closed. When the state of other openings remains unchanged and the door is closed, it can be determined that the battery compartment enters the sealed state from the non-sealed state, so the inert gas generator can be controlled to start.

[0045] Step S20, when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset range of the initial environmental parameter values, set the energy storage battery to the working state.

[0046] Among them, the initial environmental parameter value refers to the working environmental parameter value of the environment in the battery compartment before the energy storage battery is set to the working state, including at least one of the initial temperature value, the initial air pressure value, the initial inert gas concentration value, etc. The initial environmental parameter value range refers to the working environmental parameter value range that the initial environmental parameter value of the environment in the battery compartment needs to be in to ensure the safe operation of the energy storage battery, which can be determined according to the actual situation, test results, etc., and this embodiment does not limit it. As an example, the initial environmental parameter value range may include but is not limited to at least one of the following: the initial temperature value is within the temperature range of 25 - 30 °C; the initial air pressure value is within the air pressure range of 1.1 - 2 MPa; the initial inert gas concentration value reaches more than 95%.

[0047] Exemplarily, before the energy storage battery is set to the working state, the initial environmental parameter value in the battery compartment can be adjusted by first filling the battery compartment with inert gas. During the process of adjusting the initial environmental parameter value, the initial environmental parameter value in the battery compartment can be continuously or periodically detected by an environmental parameter detector, and it can be determined whether the detected initial environmental parameter value exceeds the preset initial environmental parameter value range; in the case where the initial environmental parameter value is monitored by the environmental parameter detector and exceeds the preset initial environmental parameter value range, the energy storage battery is set to the working state. In this way, in the case where the external environmental temperature is too high or the energy storage battery heats up due to excessive load, the low-temperature inert gas can effectively inhibit the increase in the temperature inside and outside the energy storage battery, thereby reducing the loss caused by high temperature to the energy storage battery. Moreover, even if the energy storage battery has abnormal conditions such as short circuit, overcurrent, and high temperature during the working process, since the inert gas has an inactive chemical property and is not easy to react with other substances, it can effectively prevent the energy storage battery from spontaneous combustion or catching fire.

[0048] As an example, in the case where the initial environmental parameter value is detected to exceed the preset initial environmental parameter value range, the inert gas generator can be turned off or not. Not turning off the inert gas generator can more comprehensively and effectively reduce the potential safety hazards caused by accidental situations such as air leakage in the battery compartment, overheating of the energy storage battery, and decomposition of the electrolyte of the energy storage battery. However, in the case where the airtightness of the battery compartment is good, the battery compartment has been in a sealed state and no new gas components are generated inside the battery compartment, the gas components in the battery compartment will not change. In the case where the environmental parameter detector continuously monitors the working environmental parameter value in the battery compartment, turning off the inert gas generator can reduce costs and save resources.

[0049] As an example, the energy storage battery safety protection system may further include a pressure relief device, such as a pressure relief valve, a gas recovery device, an exhaust gas treatment device, etc. The pressure relief device is used to regulate the working air pressure value in the battery compartment to avoid potential explosion safety hazards caused by too high a working air pressure value in the battery compartment.

[0050] Step S30, when the working environment parameter value in the battery compartment detected by the environment parameter detector exceeds the preset range of the working environment parameter value, a first safety alarm is issued.

[0051] Among them, the working environment parameter value refers to the working environment parameter value of the environment in the battery compartment when the energy storage battery is in a working state, including at least one of the working temperature value, the working air pressure value, and the working inert gas concentration value, etc. The range of the working environment parameter value refers to the range of the working environment parameter value that the environment in the battery compartment needs to be in to ensure the safe operation of the energy storage battery, which can be determined according to the actual situation, test results, etc. This embodiment does not limit this. As an example, the range of the working environment parameter value may include but is not limited to at least one of the following: the working temperature value is lower than 35°C; the working air pressure value is within the air pressure range of 1.1 - 2 MPa; the working inert gas concentration value reaches more than 80%. It can be understood that during the operation of the energy storage battery, the environmental temperature in the battery compartment may change due to reasons such as the external environmental temperature of the battery compartment and the heat generated by the operation of the energy storage battery, the environmental air pressure in the battery compartment may change due to reasons such as temperature changes, and the inert gas concentration collected by the data acquisition device may change due to reasons such as the uniform distribution of the inert gas. These reasons may not be caused by the abnormality of the energy storage battery and may not cause a safety accident, so there is no need for a safety alarm. Therefore, in order to improve the accuracy of the safety alarm and reduce false alarms, the range of the working environment parameter value can be larger than the initial environment parameter value range. Initially, a relatively ideal working environment can be provided for the energy storage battery, but during the actual operation of the energy storage battery, a certain fluctuation of the working environment parameter value within the safe range is allowed, and a first safety alarm is only given when the working environment parameter value indicates that there is a safety risk for the energy storage battery.

[0052] Exemplarily, when the energy storage battery is in a working state, the working environment parameter value of the environment in the battery compartment can be continuously or periodically detected by the environment parameter detector, and it is determined whether the detected working environment parameter value is within the preset range of the working environment parameter value; when the working environment parameter value in the battery compartment detected by the environment parameter detector exceeds the preset range of the working environment parameter value, a first safety alarm is issued to remind relevant personnel to process the possible risks in time.

[0053] In the above energy storage battery safety protection method, first, an inert gas generator is used to fill the battery compartment with inert gas, so that the energy storage battery is in an inert gas environment. Then, when the initial environmental parameter value detected by the environmental parameter detector exceeds the preset initial environmental parameter value range, the energy storage battery is set to the working state. In this way, the energy storage battery works in an inert atmosphere. Even if the temperature of the energy storage battery reaches the ignition point during operation, since the inert gas cannot burn, the energy storage battery will not catch fire, self-ignite, etc. Therefore, the risks of fire, self-ignition, etc. can be prevented from the source, effectively reducing the harm and losses suffered by the energy storage battery itself and other items and personnel. Synchronously, the environmental parameter detector can also monitor the working environmental conditions in the battery compartment during the operation of the energy storage battery. When the working environmental parameter value in the battery compartment exceeds the preset working environmental parameter value range, a first safety alarm is issued, enabling relevant parties to handle it in a timely manner and reducing the safety risks of the energy storage battery. In this way, due to the low fire risk of the energy storage battery, the service life of the battery can be extended, the full cascade utilization of old batteries is realized, which is conducive to promoting the recycling of batteries and the development of the energy storage industry.

[0054] In an exemplary embodiment, the working environmental parameter value includes at least one of the working inert gas concentration value, the working temperature value, and the working air pressure value, and the environmental parameter detector includes at least one of an inert gas detector, an environmental temperature detector, and an environmental air pressure detector. When the working environmental parameter value in the battery compartment detected by the environmental parameter detector exceeds the preset working environmental parameter value range, issuing the first safety alarm includes at least one of steps S31 to S33. Among them:

[0055] Step S31, when the working inert gas concentration value in the battery compartment detected by the inert gas detector is lower than the preset working concentration threshold, issue the first safety alarm.

[0056] Among them, the inert gas detector refers to a device that can detect the working inert gas concentration value in the environment. The working environmental parameter value includes the working inert gas concentration value, and the working environmental parameter value range includes being greater than or equal to the preset working concentration threshold. As an example, the battery compartment can be a cuboid structure, and inert gas detectors can be respectively arranged at each top corner and bottom corner in the battery compartment to improve the comprehensiveness of monitoring the inert gas in the battery compartment.

[0057] Exemplarily, when the energy storage battery is in the working state, the inert gas detector can collect a certain amount of ambient gas, and then detect the amount of inert gas in the ambient gas. According to the ratio of the amount of inert gas to the amount of ambient gas, the concentration of inert gas in the environment is determined. If the detected working inert gas concentration value is lower than the preset working concentration threshold, it indicates that there may be an abnormal atmosphere in the battery compartment. For example, the energy storage battery generates other gases due to electrolyte decomposition, chemical reactions, etc., or the airtightness of the battery compartment decreases. The decomposition of the electrolyte of the energy storage battery and chemical reactions, etc., indicate that the energy storage battery has a fault, which will have an adverse impact on the normal operation of the energy storage system and the service life of the energy storage battery. The decrease in airtightness will cause the inert gas to leak outside the battery compartment and the air outside the battery compartment to enter. The entry of air will increase the risk of fire in the battery compartment. Therefore, a safety alarm needs to be issued to remind relevant personnel to promptly handle the abnormal atmosphere situation; if the detected working inert gas concentration value is greater than or equal to the preset working concentration threshold, it indicates that the atmosphere environment in the battery compartment is normal and no safety alarm is required.

[0058] As an example, when the working inert gas concentration value in the battery compartment is detected by the inert gas detector and is lower than the preset working concentration threshold, the inert gas generator can also be turned on or the gas flow rate of the inert gas generator injecting inert gas into the battery compartment can be increased, and the inert gas is injected into the battery compartment through the inert gas generator to increase the working inert gas concentration value in the battery compartment and reduce the safety risk in the battery compartment before relevant personnel respond to the first safety alarm and make a treatment.

[0059] Step S32, when the working temperature value in the battery compartment is detected by the ambient temperature detector and is higher than the preset working temperature threshold, issue the first safety alarm.

[0060] Among them, the ambient temperature detector refers to a device that can detect the ambient temperature. The working environment parameter value includes the working temperature value, and the range of the ambient parameter value includes being less than or equal to the preset working temperature threshold. Among them, the working temperature threshold can be determined according to the actual situation and test results, etc., such as 15°C, 20°C, 25°C, etc., and can also be adjusted according to the external ambient temperature. For example, it is set to 15°C in winter, 20°C in spring and autumn, and 25°C in summer, etc. This embodiment does not limit this. As an example, the ambient temperature detector includes an infrared temperature detector. As an example, the ambient temperature detector can be set at the geometric center of the space area inside the battery compartment. If the temperature detector cannot be set at the geometric center, it can be set at the position closest to the geometric center to improve the accuracy of ambient temperature monitoring.

[0061] Exemplarily, when the energy storage battery is in the working state, the ambient temperature detector can collect the working temperature value of the environment in the battery compartment and compare the numerical magnitude relationship between the working temperature value and the working temperature threshold. If it is detected that the working temperature value is higher than the preset working temperature threshold, it indicates that there may be a temperature abnormality in the battery compartment, such as a decrease in the heat preservation performance of the battery compartment or an abnormal increase in the temperature of the energy storage battery. Therefore, a safety alarm needs to be issued to remind relevant personnel to promptly handle the temperature abnormality. If it is detected that the working temperature value is less than or equal to the preset working temperature threshold, it indicates that the ambient temperature in the battery compartment is normal and no safety alarm is required.

[0062] As an example, when the working temperature value in the battery compartment is detected by the ambient temperature detector to be higher than the preset working temperature threshold, the inert gas generator can also be turned on or the gas flow rate of the inert gas generator injecting inert gas into the battery compartment can be increased. The inert gas generator injects low-temperature inert gas into the battery compartment to quickly reduce the working temperature value in the battery compartment. As an example, the working temperature value in the battery compartment can be reduced to -15°C to 0°C to freeze various reaction components in the energy storage battery, thereby inhibiting the further temperature rise of the energy storage battery. Or, a temperature regulating device, such as a refrigerator, can also be set in the battery compartment. When the working temperature value in the battery compartment is detected by the ambient temperature detector to be higher than the preset working temperature threshold, the working temperature value in the battery compartment is reduced by the refrigerant to prevent the energy storage battery from being damaged due to excessive temperature and reduce the safety risk.

[0063] Step S33: When the working air pressure value in the battery compartment is detected by the ambient air pressure detector to be lower than the preset first working air pressure threshold or higher than the preset second working air pressure threshold, a first safety alarm is issued, where the first working air pressure threshold is less than the second working air pressure threshold.

[0064] Among them, the ambient air pressure detector refers to a device that can detect the ambient air pressure. The working environment parameter value includes the working air pressure value, and the working environment parameter value range includes being greater than or equal to the preset first working air pressure threshold and less than or equal to the preset second working air pressure threshold. The first working air pressure threshold and the second working air pressure threshold can be determined according to the actual situation, test results, etc. For example, the first working air pressure threshold can be 1.1 MPa, and the second working air pressure threshold can be 2.0 MPa. This embodiment does not limit this. As an example, the ambient air pressure detector can be set at the geometric center of the top area of the battery compartment. If the ambient air pressure detector cannot be set at the geometric center, it can be set at the position closest to the geometric center to improve the accuracy of ambient air pressure monitoring.

[0065] Exemplarily, when the energy storage battery is in the working state, the inert gas detector can collect the working air pressure value in the battery compartment. If the detected working air pressure value is lower than the preset first working air pressure threshold, it indicates that there may be a low-pressure abnormal situation in the battery compartment, such as a decrease in the airtightness of the battery compartment. A decrease in airtightness will cause the inert gas to leak outside the battery compartment and the air outside the battery compartment to enter. The entry of air will increase the risk of fire in the battery compartment. Therefore, it is necessary to issue a safety alarm to remind relevant personnel to promptly handle the low-pressure abnormal situation. If the detected working air pressure value is higher than the preset second working air pressure threshold, it indicates that there may be a high-pressure abnormal situation in the battery compartment. In the sealed state of the battery compartment, if the air pressure is too high, it may cause an explosion. Therefore, it is necessary to issue a safety alarm to remind relevant personnel to promptly handle the high-pressure abnormal situation. If the detected working air pressure value is greater than or equal to the preset first working air pressure threshold and less than or equal to the preset second working air pressure threshold, it indicates that the ambient air pressure in the battery compartment is normal and no safety alarm is required.

[0066] As an example, the passive safety protection device for the energy storage battery further includes a pressure relief valve. The pressure relief valve is provided on the body of the battery compartment and is used to discharge the gas in the battery compartment when it is in the open state. Among them, the pressure relief valve refers to a valve that can unidirectionally transfer the gas in the battery compartment to the outside. The number of pressure relief valves can be one or more.

[0067] As an example, the pressure relief valve can be connected to a vacuum pump. After the battery compartment enters the sealed state from the unsealed state, the pressure relief valve and the vacuum pump can be opened first, and the gas in the battery compartment can be pumped out through the vacuum pump. Then, the pressure relief valve and the vacuum pump are closed, and the inert gas generator is started to fill the battery compartment with inert gas.

[0068] As an example, when the working air pressure value in the battery compartment is detected by the ambient air pressure detector to be lower than the preset first working air pressure threshold or higher than the preset second working air pressure threshold, the pressure relief valve can also be opened to reduce the air pressure in the battery compartment, so as to reduce the air pressure in the battery compartment and reduce the explosion risk.

[0069] As an example, the pressure relief valve can be connected to an exhaust gas treatment device. When the energy storage battery in the battery compartment generates exhaust gas due to electrolyte decomposition, chemical reactions, etc., resulting in too high pressure in the battery compartment and a possible explosion risk, the exhaust gas can be transported to the exhaust gas treatment device through the pressure relief valve, which can not only reduce the air pressure in the battery compartment and reduce the explosion risk, but also avoid environmental pollution caused by exhaust gas emissions.

[0070] In this embodiment, by constructing a three - level alarm mechanism for atmosphere, temperature, and air pressure, the comprehensiveness and accuracy of the safety risk monitoring in the battery compartment can be improved, and the timeliness of risk detection can be enhanced, thereby shortening the time when abnormal conditions occur in the energy storage battery and reducing the damage to the energy storage battery caused by the abnormality.

[0071] In an exemplary embodiment, the energy storage battery safety protection system includes a plurality of inert gas detectors; when the detected working inert gas concentration value in the battery compartment by the inert gas detectors is lower than a preset working concentration threshold, a first safety alarm is issued, including steps S311 to S312. Among them:

[0072] Step S311, determine the target inert gas detector that detects the inert gas from each of the inert gas detectors, and query the target working concentration threshold corresponding to the target inert gas detector. Among them, the working concentration threshold is negatively correlated with the gas flow distance, where the gas flow distance refers to the distance between the inert gas detector and the gas release hole of the inert gas generator.

[0073] It should be noted that the energy storage power station has a high demand for the stored energy. Therefore, in this embodiment, the internal space of the battery compartment for placing the energy storage battery is relatively large, and the length, width, and height can all reach several meters. The more completely the inert gas fills the internal space, the better the risk regulation effect. However, when the energy storage battery is placed in the battery compartment, the flow of the inert gas will be hindered. The farther the space area is from the gas release hole of the inert gas generator, the more difficult it is to fill the inert gas, so safety hazards are likely to occur.

[0074] Among them, the gas release hole is the outflow port of the inert gas in the inert gas generator, which is arranged in the battery compartment. Therefore, the inert gas in the inert gas generator can be filled into the battery compartment. The number of gas release holes of each inert gas generator can be one or more, that is, the inert gas in each inert gas generator can flow into the battery compartment from one position or multiple positions in the battery compartment.

[0075] Therefore, in order to achieve comprehensive monitoring of the atmosphere environment in the battery compartment, multiple groups of inert gas detectors can be set at positions with different distances from the gas release hole. The distances between the inert gas detectors belonging to different inert gas detection groups and the gas release hole of the inert gas generator are not equal, and the inert gas detectors belonging to the same group can be evenly distributed at various positions with the same distance from the gas release hole. For example, the distance between the first group of inert gas detectors and the gas release hole is D1, the distance between the second group of inert gas detectors and the gas release hole is D2,..., the distance between the nth group of inert gas detectors and the gas release hole is Dn. A circle O1 can be drawn with the gas release hole as the center and D1 as the radius, and the first group of inert gas detectors can be set on the circumference of O1. Similarly, the positions of each group of inert gas detectors can be determined. In the space area where the gas flow distance is farther, it is more difficult for the inert gas to flow through, and it is more difficult to be filled with the inert gas. Therefore, under normal circumstances, the concentration of the inert gas in the space area with a longer gas flow distance will be lower than that in the space area with a shorter gas flow distance, which is not caused by an abnormality. If an inert gas detector with a shorter gas flow distance is used as the basis, a relatively high working concentration threshold will be set. For an inert gas detector with a longer gas flow distance, it is very easy to be lower than this working concentration threshold under normal operating conditions, resulting in false alarm triggering; if an inert gas detector with a longer gas flow distance is used as the basis, a relatively low working concentration threshold will be set. For an inert gas detector with a shorter gas flow distance, when it is lower than this working concentration threshold, an abnormality may have occurred for some time, so the abnormality cannot be detected in time.

[0076] As an example, referring to Figure 3 , two groups of inert gas detectors are provided in the battery compartment 102. The first group of inert gas detectors 10611 is set at the top of the battery compartment 102 and is relatively close to the gas release hole of the inert gas generator 104. The second group of inert gas detectors 10612 is set at the top of the battery compartment 102 and is relatively far from the gas release hole of the inert gas generator 104. In this case, the concentration threshold of the first group of inert gas detectors 10611 can be set to 90%, and the concentration threshold of the second group of inert gas detectors 10612 can be set to 80%.

[0077] Exemplarily, in the case where the energy storage battery safety protection system includes multiple inert gas detectors, the inert gas detectors can be deployed according to the gas flow distance, and a corresponding working concentration threshold can be determined for each inert gas detector in advance based on the gas flow distance. The working concentration threshold is negatively correlated with the gas flow distance to reduce the situation of erroneously issuing the first safety alarm due to the flow of inert gas. During the actual monitoring process, first, determine the target inert gas detectors that detect inert gas among the inert gas detectors. Then, it is necessary to query the respective target working concentration thresholds corresponding to each target inert gas detector, and compare the working inert gas concentration value monitored by each target inert gas detector with the target working concentration threshold corresponding to each inert gas detector, so as to determine whether there is an abnormal atmosphere situation.

[0078] Step S312, when the working inert gas concentration value in the battery compartment detected by the target inert gas detector is lower than the target working concentration threshold, issue the first safety alarm.

[0079] Exemplarily, if the working inert gas concentration value in the battery compartment is detected to be lower than the target working concentration threshold corresponding to the target inert gas detector by at least one target inert gas detector, it indicates that there may be an abnormal atmosphere situation in the battery compartment. For example, other gases are generated due to the decomposition of the electrolyte of the energy storage battery, chemical reactions, etc., or the airtightness of the battery compartment is reduced. Therefore, it is necessary to issue a safety alarm to remind relevant personnel to deal with the abnormal atmosphere situation in time; if the working inert gas concentration value detected by each target inert gas detector is greater than or equal to its corresponding target working concentration threshold, it indicates that the atmosphere environment in the battery compartment is normal and no safety alarm is required.

[0080] In this embodiment, by gradiently placing inert gas detectors at positions with different distances from the gas release hole, the comprehensiveness of monitoring the atmosphere environment in the battery compartment can be improved, thereby reducing potential safety hazards; by setting the working concentration threshold corresponding to each inert gas detector based on the distance between the inert gas detector and the gas release hole, the recognition accuracy of abnormal atmosphere can be improved, and the probability of false alarm triggering can be reduced while ensuring that abnormal atmosphere can be recognized in time.

[0081] In an exemplary embodiment, the passive safety protection of the energy storage battery includes: First, open the gas flow control switch between the inert gas generator and the battery compartment, so that the low-temperature inert gas fills the entire safety protection system, and discharge the air in the system out of the compartment through the pressure relief valve; after detecting that the inert gas concentration in the battery compartment reaches more than 95% by each inert gas detector, control the pressure relief valve and the inert gas flow switch to close, and then the system enters the normal working state. During the normal operation of the system, the inert gas detectors arranged at the eight corners of the battery compartment are activated and the alarm thresholds are set. Among them, the alarm thresholds of the inert gas detectors arranged at the four corners of the top layer are set to 90%, and the alarm thresholds of the inert gas detectors arranged at the four corners of the bottom layer are set to 80%. When the concentration is lower than the alarm threshold, the inert gas detector issues a first safety alarm; at the same time, the ambient temperature detector in the center of the battery compartment and the ambient air pressure detector on the top are activated. The ambient temperature detector sets an alarm threshold of 30°C. When the ambient temperature is higher than 30°C, the ambient temperature detector issues a first safety alarm; the ambient air pressure detector sets a low-pressure alarm threshold of 1.1 Mpa and a high-pressure alarm threshold of 2 Mpa. When the ambient air pressure in the battery compartment is lower than 1.1 Mpa or higher than 2 Mpa, the ambient air pressure detector issues a first safety alarm. When the ambient temperature detector issues a first safety alarm, the inert gas generator and the gas flow control switch between the inert gas generator and the battery compartment are fully opened, and the ambient temperature value in the battery compartment is quickly controlled below -10°C.

[0082] In an exemplary embodiment, as Figure 4 shown, the energy storage battery safety protection method further includes steps A10 to A20. Among them:

[0083] Step A10, obtaining the battery performance data of the energy storage battery.

[0084] It should be noted that due to the relatively poor stability of the structure of the second-life battery itself compared with that of a new battery, and the significantly increased danger and significantly shortened service life of the energy storage battery compared with those of a new battery. Since the passive protection means in the traditional technology can only cool down and extinguish the fire after the energy storage battery catches fire and burns, and the damage that has occurred before the energy storage battery is extinguished cannot be restored. Therefore, it is necessary to use big data and algorithm models to form a strict monitoring network to predict the state of the energy storage battery in the future period of time using a large amount of battery data, environmental data, etc. before the battery catches fire or spontaneously ignites, so as to achieve the purpose of preventing the energy storage battery from catching fire and burning. However, the prediction accuracy of the active safety protection method using the monitoring network is limited. To achieve a high prediction accuracy, a large amount of data and computing power are required, consuming a lot of resources and involving high costs.

[0085] Among them, the battery performance data is used to characterize the availability and safety of the energy storage battery, including the internal resistance value of the battery pack, the internal resistance value of the battery cell, the internal resistance consistency value of the battery cell, the temperature consistency data, the voltage consistency value, the charging capacity value, etc.; the battery performance data can be calculated based on the battery operation data, and the battery operation data includes the current value, the voltage value, the temperature value, the state of charge, etc. For example, the ratio of the battery cell voltage value to the battery cell current value is the internal resistance value of the battery cell.

[0086] Exemplarily, the battery operation data of the energy storage battery can be continuously or periodically collected by a data acquisition device; furthermore, active safety protection can be performed periodically or triggeringly, and the target battery operation data required for detecting the battery performance data can be obtained from the collected battery operation data, and the battery performance data can be detected based on the target battery operation data.

[0087] Step A20, when it is detected that the battery performance data does not meet the preset battery health condition, a second safety alarm is issued.

[0088] Exemplarily, the battery performance data is compared with the preset battery health condition to determine whether the battery performance data meets the preset battery health condition. If the battery performance data does not meet the preset battery health condition, it indicates that there is an abnormality in the availability and safety of the energy storage battery, and then a second safety alarm is issued to remind relevant personnel to replace the energy storage battery or battery cell that does not meet the preset battery health condition in time, so as to avoid the situation that the overall service life of the energy storage system is shortened due to local battery failure, and achieve the purpose of extending the overall service life of the battery; if the battery performance data meets the preset battery health condition, it indicates that there is no abnormality in the availability and safety of the energy storage battery, and then the second safety alarm can be temporarily not issued.

[0089] As an example, the energy storage battery safety protection system further includes a charge and discharge device, and the charge and discharge device is electrically connected to the energy storage battery. When it is detected that the energy storage battery has been in an idle state for more than a preset number of days threshold, active safety protection can be performed on the energy storage battery, that is, a charge and discharge test under normal operating conditions is started on the energy storage battery through the charge and discharge device, and at the same time, the battery operation data of the energy storage battery during the charge and discharge process is collected by the data acquisition device, the battery performance data is detected based on the battery operation data, and then the availability and safety of the energy storage battery are evaluated based on the battery performance data. When the evaluation fails, a second safety alarm is issued.

[0090] In this embodiment, since the battery compartment is filled with inert gas, the damage to the energy storage battery caused by fire, combustion, etc. can be effectively reduced. Therefore, in the process of active safety protection, the current state of the energy storage battery can be judged by means of availability and safety evaluation. Compared with the prediction method, the data volume required for active safety protection can be effectively reduced, the computing resources and costs can be reduced, and the judgment accuracy can be improved at the same time.

[0091] In an exemplary embodiment, the battery performance data includes at least one of the current internal resistance value of the battery pack, the current consistency value of the internal resistances of the battery cells, the current consistency value of the temperatures, the current consistency value of the voltages, and the current charge capacity value; when it is detected that the battery performance data does not meet the preset battery health condition, issuing the second safety alarm includes at least one of steps A21 to A25. Wherein:

[0092] Step A21: Determine the change rate of the internal resistance of the battery pack between the current internal resistance value of the battery pack and the preset initial internal resistance value of the battery pack as the change rate of the internal resistance of the energy storage battery; when it is detected that the change rate of the internal resistance of the battery pack is less than the preset first change rate threshold, issue the second safety alarm.

[0093] Among them, the change rate of the internal resistance of the battery pack is used to characterize the change in the ohmic internal resistance value of the battery pack compared with the initial state of the battery pack; the change rate of the internal resistance consistency of the battery cells is used to characterize the change in the ohmic internal resistance consistency of the battery cells in the battery pack compared with the initial state of the battery cells, where the ohmic internal resistance consistency is used to characterize the difference between the ohmic internal resistance values of the battery cells in the same battery pack; the change rate of the temperature consistency is used to characterize the change in the temperature consistency of the battery cells in the battery pack compared with the initial state of the battery cells, where the temperature consistency is used to characterize the difference between the temperature values of the battery cells in the same battery pack; the change rate of the voltage consistency is used to characterize the change in the voltage consistency of the battery cells in the battery pack compared with the initial state of the battery cells, where the voltage consistency is used to characterize the difference between the voltage values of the battery cells in the same battery pack; the change rate of the charge capacity is used to characterize the change in the charge capacity of the energy storage battery compared with the initial state of the battery pack. Therefore, when evaluating the availability and safety of the energy storage battery each time, the currently detected battery performance data can be obtained, the currently detected battery performance data can be compared with the initial battery performance data, and the change of each battery performance data can be calculated, so as to determine whether the energy storage battery currently meets the preset battery health condition.

[0094] Exemplarily, the difference in the internal resistance of the battery pack between the current internal resistance value of the battery pack and the preset initial internal resistance value of the battery pack can be calculated, the difference in the internal resistance of the battery pack can be determined as the change rate of the internal resistance of the energy storage battery, the change rate of the internal resistance of the battery pack can be compared with the preset first change rate threshold, and if the change rate of the internal resistance of the battery pack is less than the preset first change rate threshold, the second safety alarm is issued, otherwise the second safety alarm is not issued.

[0095] Step A22: Determine the change rate of the internal resistance consistency of the energy storage battery by taking the difference in internal resistance consistency between the current internal resistance consistency value of the battery cell and the preset initial internal resistance consistency value of the battery cell. When it is detected that the change rate of the internal resistance consistency is less than the preset second change rate threshold, issue a second safety alarm.

[0096] Exemplarily, the difference in internal resistance consistency between the current internal resistance consistency value of the battery cell and the preset initial internal resistance consistency value of the battery cell can be calculated, the difference in internal resistance consistency can be determined as the change rate of the internal resistance consistency of the energy storage battery, the change rate of the internal resistance consistency is compared with the preset second change rate threshold. If the change rate of the internal resistance consistency is less than the preset second change rate threshold, then issue a second safety alarm, otherwise do not issue a second safety alarm.

[0097] Step A23: Determine the change rate of the temperature consistency of the energy storage battery by taking the difference in temperature consistency between the current temperature consistency value and the preset initial temperature consistency value. When it is detected that the change rate of the temperature consistency is less than the preset third change rate threshold, issue a second safety alarm.

[0098] Exemplarily, the difference in temperature consistency between the current temperature consistency value and the preset initial temperature consistency value can be calculated, the difference in temperature consistency can be determined as the change rate of the temperature consistency of the energy storage battery, the change rate of the temperature consistency is compared with the preset third change rate threshold. If the change rate of the temperature consistency is less than the preset third change rate threshold, then issue a second safety alarm, otherwise do not issue a second safety alarm.

[0099] Step A24: Determine the change rate of the voltage consistency of the energy storage battery by taking the difference in voltage consistency between the current voltage consistency value and the preset initial voltage consistency value. When it is detected that the change rate of the voltage consistency is less than the preset fourth change rate threshold, issue a second safety alarm.

[0100] Exemplarily, the difference in voltage consistency between the current voltage consistency value and the preset initial voltage consistency value can be calculated, the difference in voltage consistency can be determined as the change rate of the voltage consistency of the energy storage battery, the change rate of the voltage consistency is compared with the preset fourth change rate threshold. If the change rate of the voltage consistency is less than the preset fourth change rate threshold, then issue a second safety alarm, otherwise do not issue a second safety alarm.

[0101] Step A25: Determine the change rate of the charging capacity of the energy storage battery by taking the difference in charging capacity between the current charging capacity value and the preset initial charging capacity value. When it is detected that the change rate of the charging capacity is less than the preset fifth change rate threshold, issue a second safety alarm.

[0102] Exemplarily, a charge capacity difference between the current charge capacity value and a preset initial charge capacity value can be calculated, and the charge capacity difference is determined as the charge capacity change rate of the energy storage battery. The charge capacity change rate is compared with a preset fifth change rate threshold. If the charge capacity change rate is less than the preset fifth change rate threshold, a second safety alarm is issued; otherwise, the second safety alarm is not issued.

[0103] In this embodiment, from five aspects including the ohmic internal resistance of the battery pack, the internal resistance consistency of the battery cells, the temperature consistency of the battery cells, the voltage consistency of the battery cells, and the charge capacity of the battery pack, the availability and safety of the energy storage battery can be evaluated more accurately, and the energy storage battery or battery cells can be replaced in time to avoid the situation that the overall service life of the energy storage system is shortened due to local battery failures, achieving the purpose of extending the battery service life.

[0104] In an exemplary embodiment, the energy storage battery includes at least one battery cell; the battery performance data includes at least one of the internal resistance value of the battery pack, the internal resistance consistency value of the battery cells, the temperature consistency value, the voltage consistency value, and the charge capacity value; obtaining the battery performance data of the energy storage battery includes at least one of steps A11 to A15. Among them:

[0105] Step A11: Obtain a first unit voltage change value and a first unit current change value of the energy storage battery at at least one first target state of charge, detect the time-sharing internal resistance value corresponding to each first target state of charge based on the first unit voltage change value and the first unit current change value, and aggregate the time-sharing internal resistance values into the internal resistance value of the battery pack of the energy storage battery.

[0106] Among them, the unit voltage change value refers to the change value of the voltage at each unit state of charge during the charge and discharge process, and the first unit voltage change value refers to the unit voltage change value of the battery pack; the unit current change value refers to the change value of the current at each unit state of charge during the charge and discharge process, and the first unit current change value refers to the unit current change value of the battery pack; the ratio of the unit voltage change value to the unit current change value at the same state of charge is the time-sharing internal resistance value at that state of charge. To improve the evaluation accuracy, multiple time-sharing internal resistance values of the battery pack at different states of charge can be detected, and then the various time-sharing internal resistance values are aggregated, and the aggregation result is determined as the internal resistance consistency value of the battery cells, reducing the detection error and improving the detection accuracy. Among them, the aggregation methods include taking the average value, summing, etc., and this embodiment does not limit this.

[0107] Exemplarily, the battery pack voltage data and battery pack current data of the energy storage battery during charging and discharging collected by the data acquisition device can be obtained first. The first unit voltage change value of the energy storage battery at at least one first target state of charge is extracted from the battery pack voltage data, and the first unit current change value of the energy storage battery at at least one first target state of charge is extracted from the battery pack current data. Furthermore, the ratio of the first unit voltage change value corresponding to each first target state of charge to the first unit current change value is calculated to obtain the time-sharing internal resistance value of the battery pack at each first target state of charge. Furthermore, the average value of the time-sharing internal resistance values is calculated to obtain the internal resistance value of the battery pack of the energy storage battery.

[0108] Step A12: Obtain the second unit voltage change value and the second unit current change value of each battery cell at the second target state of charge, detect the internal resistance value of each battery cell at the second target state of charge based on the second unit voltage change value and the second unit current change value, and determine the difference between the maximum internal resistance value and the minimum internal resistance value among the internal resistance values of each battery cell as the internal resistance consistency value of the energy storage battery.

[0109] Among them, the second unit voltage change value refers to the unit voltage change value of the battery cell; the second unit current change value refers to the unit current change value of the battery cell.

[0110] Exemplarily, the cell voltage data and cell current data of each cell in the same energy storage battery during charging and discharging collected by the data acquisition device can be obtained first. The second unit voltage change value of each cell at the second target state of charge is extracted from the cell voltage data, and the second unit current change value of each cell at the second target state of charge is extracted from the cell current data. Furthermore, the ratio of the second unit voltage change value corresponding to each cell to the second unit current change value is calculated to obtain the internal resistance value of each cell at each second target state of charge. Furthermore, the maximum internal resistance value and the minimum internal resistance value are selected from the internal resistance values of each cell, and the difference between the maximum internal resistance value and the minimum internal resistance value is determined as the internal resistance consistency value of the energy storage battery. It can be understood that if there are multiple energy storage batteries placed in the battery compartment, the internal resistance consistency values of each energy storage battery can be detected separately.

[0111] Step A13: Obtain the cell temperature values collected by each cell at the same moment, and determine the difference between the maximum cell temperature value and the minimum cell temperature value among the cell temperature values as the temperature consistency value of the energy storage battery.

[0112] Exemplarily, the temperature data of each battery cell in the same energy storage battery collected by the data acquisition device during the charging and discharging process can be obtained first, and the battery cell temperature value of each battery cell at the same moment can be extracted from the temperature data; furthermore, the maximum battery cell temperature value and the minimum battery cell temperature value can be selected from the respective battery cell temperature values, and the difference between the maximum battery cell temperature value and the minimum battery cell temperature value is determined as the temperature consistency value of the energy storage battery. It can be understood that if there are multiple energy storage batteries placed in the battery compartment, the temperature consistency values of each energy storage battery can be detected separately.

[0113] Step A14, obtain the battery cell voltage values collected by each battery cell at the same moment, and determine the difference between the maximum battery cell voltage value and the minimum battery cell voltage value among the battery cell voltage values as the voltage consistency value of the energy storage battery.

[0114] Exemplarily, the voltage data of each battery cell in the same energy storage battery collected by the data acquisition device during the charging and discharging process can be obtained first, and the battery cell voltage value of each battery cell at the same moment can be extracted from the voltage data; furthermore, the maximum battery cell voltage value and the minimum battery cell voltage value can be selected from the respective battery cell voltage values, and the difference between the maximum battery cell voltage value and the minimum battery cell voltage value is determined as the voltage consistency value of the energy storage battery. It can be understood that if there are multiple energy storage batteries placed in the battery compartment, the voltage consistency values of each energy storage battery can be detected separately.

[0115] Step A15, obtain the charging current data of the energy storage battery in the target charging segment, and detect the charging capacity value of the energy storage battery according to the charging current data.

[0116] Exemplarily, the charging current data of the energy storage battery in the target charging segment collected by the data acquisition device can be obtained first, and then the charging capacity of the energy storage battery can be detected based on the charging current data. Exemplarily, the charging current data refers to the curve of the current changing with time during the charging process. By using the ampere-hour integration method to integrate the charging current data, the charging capacity value of the energy storage battery can be obtained.

[0117] In this embodiment, by analyzing the Ohmic internal resistance of the battery pack, the internal resistance consistency of the battery cells, the temperature consistency of the battery cells, the voltage consistency of the battery cells, and the charging capacity value of the battery pack through the collected battery operation data, the comprehensive monitoring of the battery performance data is realized, and the accuracy of the evaluation of the usefulness and safety of the energy storage battery is improved.

[0118] In an exemplary embodiment, the active safety protection of the energy storage battery includes battery health analysis, and the battery health analysis includes five items: battery pack internal resistance analysis, battery cell internal resistance consistency analysis, temperature consistency analysis, voltage consistency analysis, and charging capacity analysis. Refer to Figure 5, the energy storage battery safety protection system further includes a charge and discharge device 108, a data acquisition device 110, a database 112, and a data analysis terminal 114. During the operation of the energy storage battery 202, it is not necessary to turn on the charge and discharge device 108. Only the data required for battery health analysis can be collected through the data acquisition device 110. The collected data can be stored in the database 112 for use by the data analysis terminal 114. However, if battery health analysis is to be performed when the energy storage battery 202 is in an idle state, it is necessary to turn on the charge and discharge device 108 to simulate the operation process of the energy storage battery 202 through the charge and discharge device 108. Among them:

[0119] The method for analyzing the internal resistance of the battery pack is as follows: when the SOC (state of charge) value of the battery increases from 50% to 51% during the battery charging process, calculate the battery pack terminal voltage difference ΔU and the charging current difference ΔI, then ΔU / ΔI is the internal resistance value corresponding to the 50% SOC value during the time period; use the same method to calculate the internal resistance values corresponding to the battery SOC values of 60%, 70%, and 80% respectively, and calculate the average value as the change rate of the internal resistance of the current battery pack.

[0120] The method for analyzing the consistency of the internal resistance of the battery cells is as follows: when the SOC value of the battery increases from 80% to 81% during the battery charging process, calculate the terminal voltage difference ΔU and the charging current difference ΔI of each battery cell in the battery pack, and determine ΔU / ΔI as the internal resistance value corresponding to each battery cell. The maximum difference between the internal resistance values of each battery cell is determined as the internal resistance consistency value. The method for analyzing the temperature consistency is as follows: during the battery charging process, monitor the cell temperatures of each battery cell in the battery pack at the same time, and determine the maximum difference between the cell temperatures as the temperature consistency value. The method for analyzing the voltage consistency is as follows: during the battery charging process, monitor the cell voltages of each battery cell in the battery pack at the same time, and determine the maximum difference between the cell voltages as the voltage consistency value. The method for analyzing the charge capacity value is as follows: select the charging segment when the battery SOC value increases from 40% to 80% during the battery charging process, and calculate the charge capacity value of the battery during this charging segment using the ampere-hour integration method.

[0121] Obtain the initial internal resistance value of the battery pack, the initial internal resistance consistency value of the battery cells, the initial temperature consistency value, the initial voltage consistency value, and the initial charge capacity value detected during the initial operation of the energy storage battery. Calculate the change rates of the internal resistance value of the battery pack, the internal resistance consistency value of the battery cells, the temperature consistency value, the voltage consistency value, and the charge capacity value from the initial operation to the current. If the change rate of any one of the parameters of the internal resistance value of the battery pack, the internal resistance consistency value of the battery cells, the temperature consistency value, the voltage consistency value, and the charge capacity value exceeds 20%, then issue a second safety alarm to remind the relevant personnel to replace the battery pack.

[0122] It should be understood that although the steps in the flowcharts involved in the above embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless clearly stated in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0123] Based on the same inventive concept, an embodiment of the present application also provides an energy storage battery safety protection device for implementing the energy storage battery safety protection method involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the energy storage battery safety protection device provided below can refer to the limitations on the energy storage battery safety protection method in the above text, and will not be repeated here.

[0124] In an exemplary embodiment, as Figure 6 shown, an energy storage battery safety protection device is provided, including: an inflation module 302, a detection module 304, and an alarm module 306, where:

[0125] The inflation module 302 is configured to fill the battery compartment with inert gas through an inert gas generator, where the inert gas is used to adjust the initial environmental parameter value in the battery compartment.

[0126] The detection module 304 is configured to set the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter value exceeds the preset initial environmental parameter value range.

[0127] The alarm module 306 is configured to issue a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter value in the battery compartment exceeds the preset working environmental parameter value range.

[0128] In an exemplary embodiment, the working environment parameter value includes at least one of a working inert gas concentration value, a working temperature value, and a working air pressure value, and the environmental parameter detector includes at least one of an inert gas detector, an environmental temperature detector, and an environmental air pressure detector; the alarm module 306 is further configured to: issue a first safety alarm when the working inert gas concentration value in the battery compartment detected by the inert gas detector is lower than a preset working concentration threshold; issue a first safety alarm when the working temperature value in the battery compartment detected by the environmental temperature detector is higher than a preset working temperature threshold; issue a first safety alarm when the working air pressure value in the battery compartment detected by the environmental air pressure detector is lower than a preset first working air pressure threshold or higher than a preset second working air pressure threshold, where the first working air pressure threshold is less than the second working air pressure threshold.

[0129] In an exemplary embodiment, the energy storage battery safety protection system includes a plurality of inert gas detectors; the alarm module 306 is further configured to: determine a target inert gas detector that detects inert gas from each of the inert gas detectors, and query a target working concentration threshold corresponding to the target inert gas detector, where the working concentration threshold is negatively correlated with the gas flow distance, and the gas flow distance refers to the distance between the inert gas detector and the gas release hole of the inert gas generator; issue a first safety alarm when the working inert gas concentration value in the battery compartment detected by the target inert gas detector is lower than the target working concentration threshold.

[0130] In an exemplary embodiment, the energy storage battery safety protection device further includes an active safety module, and the active safety module is configured to: obtain battery performance data of the energy storage battery; issue a second safety alarm when it is detected that the battery performance data does not meet a preset battery health condition.

[0131] In an exemplary embodiment, the battery performance data includes at least one of the current internal resistance value of the battery pack, the current internal resistance consistency value of the battery cells, the current temperature consistency value, the current voltage consistency value, and the current charge capacity value; the active safety module is further configured to: determine the battery pack internal resistance change rate of the energy storage battery as the difference between the current internal resistance value of the battery pack and the preset initial internal resistance value of the battery pack; issue a second safety alarm when it is detected that the battery pack internal resistance change rate is less than a preset first change rate threshold; determine the internal resistance consistency change rate of the energy storage battery as the difference between the current internal resistance consistency value of the battery cells and the preset initial internal resistance consistency value of the battery cells; issue a second safety alarm when it is detected that the internal resistance consistency change rate is less than a preset second change rate threshold; determine the temperature consistency change rate of the energy storage battery as the difference between the current temperature consistency value and the preset initial temperature consistency value; issue a second safety alarm when it is detected that the temperature consistency change rate is less than a preset third change rate threshold; determine the voltage consistency change rate of the energy storage battery as the difference between the current voltage consistency value and the preset initial voltage consistency value; issue a second safety alarm when it is detected that the voltage consistency change rate is less than a preset fourth change rate threshold; and determine the charge capacity change rate of the energy storage battery as the difference between the current charge capacity value and the preset initial charge capacity value; issue a second safety alarm when it is detected that the charge capacity change rate is less than a preset fifth change rate threshold.

[0132] In an exemplary embodiment, the energy storage battery includes at least one battery cell; the battery performance data includes at least one of the internal resistance value of the battery pack, the internal resistance consistency value of the battery cells, the temperature consistency value, the voltage consistency value, and the charge capacity value; the active safety module is further configured to: obtain a first unit voltage change value and a first unit current change value of the energy storage battery at at least one first target state of charge, detect the time-sharing internal resistance value corresponding to each first target state of charge based on the first unit voltage change value and the first unit current change value, and aggregate the time-sharing internal resistance values into the internal resistance value of the battery pack of the energy storage battery; obtain a second unit voltage change value and a second unit current change value of each battery cell at a second target state of charge, detect the internal resistance value of each battery cell at the second target state of charge based on the second unit voltage change value and the second unit current change value, and determine the difference between the maximum internal resistance value and the minimum internal resistance value among the internal resistance values of each battery cell as the internal resistance consistency value of the energy storage battery; obtain the battery cell temperature values collected by each battery cell at the same moment, and determine the difference between the maximum battery cell temperature value and the minimum battery cell temperature value among the battery cell temperature values as the temperature consistency value of the energy storage battery; obtain the battery cell voltage values collected by each battery cell at the same moment, and determine the difference between the maximum battery cell voltage value and the minimum battery cell voltage value among the battery cell voltage values as the voltage consistency value of the energy storage battery; obtain the charging current data of the energy storage battery within a target charging segment, and detect the charge capacity value of the energy storage battery according to the charging current data.

[0133] Each module in the above energy storage battery safety protection device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0134] In an exemplary embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 7As shown in the figure. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a method for protecting the safety of energy storage batteries. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0135] Those skilled in the art can understand that Figure 7 the structure shown in the figure is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0136] In one embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0137] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0138] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0139] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0140] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., and are not limited thereto.

[0141] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope recorded in this application.

[0142] The above embodiments only express several implementation manners of this application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application shall be subject to the appended claims.

Claims

1. A method for protecting the safety of an energy storage battery, characterized in that, The method is applied to an energy storage battery safety protection system, which includes a battery compartment, an inert gas generator, and an environmental parameter detector; the environmental parameter detector includes multiple groups of inert gas detectors, and the distances between the inert gas detectors belonging to the same inert gas detection group and the gas release holes of the inert gas generator are equal, while the distances between the inert gas detectors belonging to different inert gas detection groups and the gas release holes of the inert gas generator are not equal; the method includes: Filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter values in the battery compartment; Setting the energy storage battery to the working state when it is detected by the environmental parameter detector that the initial environmental parameter values exceed the preset initial environmental parameter value range; Issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter values in the battery compartment exceed the preset working environmental parameter value range, and the working environmental parameter values include the working inert gas concentration value; The step of issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter values in the battery compartment exceed the preset working environmental parameter value range includes: Determining the target inert gas detector that detects inert gas from each of the inert gas detectors, and querying the target working concentration threshold corresponding to the target inert gas detector, where the target working concentration threshold is negatively correlated with the gas flow distance, and the gas flow distance refers to the distance between the inert gas detector and the gas release hole of the inert gas generator; Issuing a first safety alarm when it is detected by the target inert gas detector that the working inert gas concentration value in the battery compartment is lower than the target working concentration threshold.

2. The method according to claim 1, wherein The working environmental parameter values include at least one of the working temperature value and the working air pressure value, and the environmental parameter detector includes at least one of an environmental temperature detector and an environmental air pressure detector; the step of issuing a first safety alarm when it is detected by the environmental parameter detector that the working environmental parameter values in the battery compartment exceed the preset working environmental parameter value range includes at least one of the following: Issuing a first safety alarm when it is detected by the environmental temperature detector that the working temperature value in the battery compartment is higher than the preset working temperature threshold; Issuing a first safety alarm when it is detected by the environmental air pressure detector that the working air pressure value in the battery compartment is lower than the preset first working air pressure threshold or higher than the preset second working air pressure threshold, where the first working air pressure threshold is less than the second working air pressure threshold.

3. The method according to claim 1, wherein The method further includes: Obtaining the battery performance data of the energy storage battery; Issuing a second safety alarm when it is detected that the battery performance data does not meet the preset battery health conditions.

4. The method according to claim 3, wherein The battery performance data includes at least one of the current internal resistance value of the battery pack, the current consistency value of the internal resistance of the battery cells, the current consistency value of the temperature, the current consistency value of the voltage, and the current charge capacity value; When it is detected that the battery performance data does not meet the preset battery health condition, a second safety alarm is issued, including at least one of the following: Determine the internal resistance change rate of the energy storage battery by taking the difference in the internal resistance of the battery pack between the current internal resistance value of the battery pack and the preset initial internal resistance value of the battery pack; when it is detected that the internal resistance change rate of the battery pack is less than the preset first change rate threshold, issue a second safety alarm; Determine the change rate of the internal resistance consistency of the energy storage battery by taking the difference in the internal resistance consistency between the current internal resistance consistency value of the battery cells and the preset initial internal resistance consistency value of the battery cells; when it is detected that the change rate of the internal resistance consistency of the battery cells is less than the preset second change rate threshold, issue a second safety alarm; Determine the change rate of the temperature consistency of the energy storage battery by taking the difference in the temperature consistency between the current temperature consistency value and the preset initial temperature consistency value; when it is detected that the change rate of the temperature consistency is less than the preset third change rate threshold, issue a second safety alarm; Determine the change rate of the voltage consistency of the energy storage battery by taking the difference in the voltage consistency between the current voltage consistency value and the preset initial voltage consistency value; when it is detected that the change rate of the voltage consistency is less than the preset fourth change rate threshold, issue a second safety alarm; And determine the change rate of the charge capacity of the energy storage battery by taking the difference in the charge capacity between the current charge capacity value and the preset initial charge capacity value; when it is detected that the change rate of the charge capacity is less than the preset fifth change rate threshold, issue a second safety alarm.

5. The method according to claim 3, characterized in that The energy storage battery includes at least one battery cell; the battery performance data includes at least one of the internal resistance value of the battery pack, the internal resistance consistency value of the battery cells, the temperature consistency value, the voltage consistency value, and the charge capacity value; obtaining the battery performance data of the energy storage battery includes at least one of the following: Obtain the first unit voltage change value and the first unit current change value of the energy storage battery at at least one first target state of charge; Detect the time-sharing internal resistance value corresponding to each first target state of charge based on the first unit voltage change value and the first unit current change value; Aggregate the time-sharing internal resistance values into the internal resistance value of the battery pack of the energy storage battery; Obtain the second unit voltage change value and the second unit current change value of each battery cell at a second target state of charge; Detect the internal resistance value of each battery cell at the second target state of charge based on the second unit voltage change value and the second unit current change value; determine the difference between the maximum internal resistance value and the minimum internal resistance value among the internal resistance values of each battery cell as the internal resistance consistency value of the energy storage battery; Obtain the battery cell temperature values collected by each battery cell at the same moment; Determine the temperature consistency value of the energy storage battery as the difference between the maximum cell temperature value and the minimum cell temperature value among the cell temperature values; Obtain the cell voltage values collected by each of the cells at the same moment; Determine the voltage consistency value of the energy storage battery as the difference between the maximum cell voltage value and the minimum cell voltage value among the cell voltage values; Obtain the charging current data of the energy storage battery within a target charging segment; detect the charging capacity value of the energy storage battery according to the charging current data.

6. An energy storage battery safety protection device, characterized in that, The device is applied to an energy storage battery safety protection system, and the energy storage battery safety protection system includes a battery compartment, an inert gas generator, and an environmental parameter detector; the environmental parameter detector includes multiple groups of inert gas detectors, and the distances between the inert gas detectors belonging to the same inert gas detection group and the gas release holes of the inert gas generator are equal, and the distances between the inert gas detectors belonging to different inert gas detection groups and the gas release holes of the inert gas generator are not equal; the device includes: An inflation module for filling the battery compartment with inert gas through the inert gas generator, where the inert gas is used to regulate the initial environmental parameter value in the battery compartment; A detection module for setting the energy storage battery to a working state when it is detected through the environmental parameter detector that the initial environmental parameter value exceeds a preset initial environmental parameter value range; An alarm module for issuing a first safety alarm when it is detected through the environmental parameter detector that the working environmental parameter value in the battery compartment exceeds a preset working environmental parameter value range, where the working environmental parameter value includes a working inert gas concentration value; The alarm module is further configured to determine a target inert gas detector that detects inert gas from each of the inert gas detectors, and query the target working concentration threshold corresponding to the target inert gas detector, where the working concentration threshold is negatively correlated with the gas flow distance, and the gas flow distance refers to the distance between the inert gas detector and the gas release hole of the inert gas generator; issue a first safety alarm when it is detected through the target inert gas detector that the working inert gas concentration value in the battery compartment is lower than the target working concentration threshold.

7. The device according to claim 6, wherein The alarm module is further configured to: Issue a first safety alarm when it is detected through the environmental temperature detector that the working temperature value in the battery compartment is higher than a preset working temperature threshold; Issue a first safety alarm when it is detected through the environmental pressure detector that the working pressure value in the battery compartment is lower than a preset first working pressure threshold or higher than a preset second working pressure threshold, where the first working pressure threshold is less than the second working pressure threshold.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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