Battery liquid leakage detection method and apparatus, and battery and energy storage system

Abstract

A battery liquid leakage detection method, comprising: acquiring concentration information of a target gas in a box body (120) and time information for collecting the concentration information (310), wherein the target gas is a volatile gas of an electrolyte; and when the concentration of the target gas at a target moment is greater than or equal to a target concentration, determining that leakage has occurred in the electrolyte (320), wherein the target concentration is the sum of the concentration of the target gas before a target duration at the target moment and a preset concentration, and the target moment is any moment within a first preset duration. The detection method can accurately and effectively detect the leakage of an electrolyte in a battery. Further provided are a battery liquid leakage detection (4000), a battery and an energy storage system.

Description

Battery leakage detection methods, detection devices, batteries and energy storage systems Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411408496.6, filed on October 10, 2024, entitled “Method for detecting battery leakage, detection device, battery and energy storage system”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a method, device, battery, and energy storage system for detecting battery leakage. Background Technology

[0003] Due to their advantages such as high energy density, rechargeability, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0004] Batteries may experience thermal runaway during use. When one or more battery cells experience thermal runaway, heat can be transferred to adjacent cells, potentially leading to fires or explosions. Electrolyte leakage is a significant cause of thermal runaway. Therefore, accurately and effectively detecting electrolyte leaks is a pressing issue that needs to be addressed. Summary of the Invention

[0005] This application provides a method, device, battery, and energy storage system for detecting battery leakage, which can accurately and effectively detect electrolyte leakage in batteries.

[0006] In a first aspect, a method for detecting battery leakage is provided. The battery includes a housing and battery cells disposed within the housing. Each battery cell includes an electrolyte. The detection method includes: acquiring concentration information of a target gas within the housing and time information of acquiring the concentration information, wherein the target gas is a volatile gas of the electrolyte; and determining that electrolyte leakage has occurred when the concentration of the target gas at a target time is greater than or equal to a target concentration, wherein the target concentration is the sum of the concentration of the target gas before a target time and a preset concentration, and the target time is any time within a first preset time.

[0007] In this embodiment, if the concentration of the target gas at each moment within a first preset time period is greater than or equal to the sum of the concentration of the target gas a certain period prior and a preset concentration, it can be determined that an electrolyte leak has occurred. That is, by comparing the concentration of the target gas within a certain time period with the sum of the concentration of the target gas at another time period prior and a preset concentration, the impact of errors in collecting the concentration of volatile gases from the electrolyte on determining whether an electrolyte leak has occurred can be reduced, improving the accuracy of electrolyte leak detection. This allows for timely battery maintenance when an electrolyte leak occurs, reducing the risk of battery thermal runaway.

[0008] In one possible implementation, if the concentration of the target gas at a first target time is greater than or equal to the first target concentration and less than or equal to the second target concentration, it is determined that a first-level leakage of the electrolyte has occurred. The first target concentration is the sum of the concentration of the target gas before the first target time and the first preset concentration, and the second target concentration is the sum of the concentration of the target gas before the second target time and the second preset concentration. The first target time is any time within the first time window, the first preset time includes the first preset time window, and the target concentration includes the first target concentration.

[0009] In this embodiment, within the first time window, if the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time ago and a first preset concentration, and less than or equal to the sum of the concentration of the target gas some time ago and a second preset concentration, a first-level electrolyte leak can be determined. By comparing the concentration of the target gas within a certain time period with the sum of the concentration of the target gas in another time period before that time period and the first and second preset concentrations, the error in collecting the concentration of the target gas can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0010] In one possible implementation, if the concentration of the target gas at the second target time is greater than or equal to the third target concentration, it is determined that a secondary leakage of the electrolyte has occurred. The third target concentration is the sum of the concentration of the target gas before the third target time and the third preset concentration. The second target time is any time within the second time window, the first preset time includes the second time window, the target concentration includes the third target concentration, and the third preset concentration is greater than or equal to the second preset concentration.

[0011] In this embodiment, within the second time window, if the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time ago and the third preset concentration, a secondary leakage of the electrolyte can be determined. By comparing the concentration of the target gas over a period of time with the sum of the concentration of the target gas at another period of time before that time and the third preset concentration, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, thereby enabling a more accurate determination of the level of electrolyte leakage.

[0012] In one possible implementation, the detection method further includes determining that an electrolyte leak has occurred when the concentration of the target gas is greater than or equal to a fourth preset concentration and continues for a second preset duration.

[0013] In this embodiment, if the concentration of volatile gases in the electrolyte within the tank remains greater than or equal to a fourth preset concentration for a second preset time period, an electrolyte leak can be determined. By detecting the gas concentration over a period of time, the impact of errors in collecting the concentration of volatile gases from the electrolyte on determining whether an electrolyte leak has occurred can be reduced, thereby improving the accuracy of electrolyte leak detection.

[0014] In one possible implementation, the detection method further includes: determining that a first-level leak of electrolyte has occurred when the concentration of the target gas is greater than or equal to a fifth preset concentration and less than or equal to a sixth preset concentration, and this continues for a third preset duration.

[0015] In this embodiment, if the concentration of the target gas is consistently greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration within a third preset time period, a first-level electrolyte leak can be considered to have occurred. That is, by comparing the concentration of the target gas with the fifth and sixth preset concentrations over a period of time, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0016] In one possible implementation, the detection method further includes: determining that a secondary leakage of the electrolyte has occurred when the concentration of the target gas is greater than or equal to a seventh preset concentration and continues for a fourth preset duration, wherein the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0017] In this embodiment, if the concentration of the target gas remains greater than or equal to the seventh preset concentration for a fourth preset time period, a secondary leakage of the electrolyte can be considered to have occurred. That is, by comparing the concentration of the target gas with the seventh preset concentration over a period of time, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0018] In one possible implementation, the detection method further includes sending information about a Level 1 leak to the battery's fire suppression system and / or parameter display device.

[0019] In the embodiments of this application, in the event of a first-level electrolyte leak, information about the first-level leak is sent to the battery's fire protection system and / or parameter display device. This enables the fire protection system to react promptly to the electrolyte leak, such as by issuing an alarm, and / or allows personnel to promptly and accurately learn about the electrolyte leakage situation from the parameter display device, so that personnel can take appropriate actions based on the battery leakage situation, such as performing battery maintenance.

[0020] In one possible implementation, the detection method further includes sending information about a secondary leak to the battery's fire suppression system and / or parameter display device.

[0021] In the embodiments of this application, in the event of a secondary leakage of the electrolyte, information about the secondary leakage is sent to the battery's fire suppression system and / or parameter display device. This enables the parameter display device to react promptly to the electrolyte leakage, such as by performing fire extinguishing operations, and / or allows personnel to promptly and accurately learn about the electrolyte leakage situation from the parameter display device, so that personnel can take appropriate actions based on the electrolyte leakage situation, such as maintaining the battery.

[0022] In one possible implementation, the detection method further includes: acquiring battery state information, including a power-on state or a power-off state; controlling the battery to power off when the battery is in a power-on state; or, controlling the battery to remain in a power-off state when the battery is in a power-off state.

[0023] In this embodiment of the application, in the event of a secondary leakage of the battery electrolyte, it is necessary to control the battery to either shut down or remain in a powered-off state to reduce the possibility of fire, explosion, or other problems caused by electrolyte leakage, thereby reducing the loss of personal and property safety for users.

[0024] In one possible implementation, the concentration information of the target gas is acquired using a non-dispersive infrared (NDIR) gas sensor, which is housed within the chamber.

[0025] In this embodiment, the NDIR gas sensor boasts high accuracy and long lifespan. Using an NDIR gas sensor to collect the concentration of volatile gases from the electrolyte at the collection point can improve the accuracy of electrolyte leakage detection. Furthermore, the NDIR gas sensor is suitable for long-life batteries, reducing the need for disassembly and installation of the battery pack and minimizing battery maintenance.

[0026] In one possible implementation, the power source for the NDIR gas sensor includes one or more of the following: a battery, a power supply from the monitoring unit of a battery cell, or a power supply from the battery management system of the battery.

[0027] Secondly, a battery leakage detection device is provided. The battery includes a housing and battery cells disposed within the housing. Each battery cell includes an electrolyte. The detection device includes: an acquisition unit for acquiring concentration information of a target gas within the housing and time information for acquiring the concentration information, wherein the target gas is a volatile gas of the electrolyte; and a processing unit for determining that electrolyte leakage has occurred when the concentration of the target gas at a target time is greater than or equal to the target concentration, wherein the target concentration is the sum of the concentration of the target gas before a target time and a preset concentration, and the target time is any time within a first preset time.

[0028] In one possible implementation, the processing unit is configured to determine that a first-level leakage of the electrolyte has occurred when the concentration of the target gas at a first target time is greater than or equal to the first target concentration and less than or equal to the second target concentration. The first target concentration is the sum of the concentration of the target gas before the first target time and the first preset concentration, and the second target concentration is the sum of the concentration of the target gas before the second target time and the second preset concentration. The first target time is any time within a first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0029] In one possible implementation, the processing unit is configured to determine that a secondary leakage of the electrolyte has occurred if the concentration of the target gas at the second target time is greater than or equal to the third target concentration. The third target concentration is the sum of the concentration of the target gas before the third target time and the third preset concentration. The second target time is any time within the second time window, the first preset time includes the second time window, the target concentration includes the third target concentration, and the third preset concentration is greater than or equal to the second preset concentration.

[0030] In one possible implementation, the processing unit is configured to determine that an electrolyte leak has occurred when the concentration of the target gas is greater than or equal to a fourth preset concentration and continues for a second preset duration.

[0031] In one possible implementation, the processing unit is configured to determine that a first-level leakage of the electrolyte has occurred when the concentration of the target gas is greater than or equal to a fifth preset concentration and less than or equal to a sixth preset concentration, and this continues for a third preset duration.

[0032] In one possible implementation, the processing unit is configured to determine that a secondary leakage of the electrolyte has occurred when the concentration of the target gas is greater than or equal to a seventh preset concentration and continues for a fourth preset duration, wherein the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0033] In one possible implementation, the detection device further includes a transmitting unit for transmitting information about a Level 1 leak to the battery's fire suppression system and / or parameter display device.

[0034] In one possible implementation, the detection device further includes a transmitting unit for transmitting information about a secondary leak to the battery's fire suppression system and / or parameter display device.

[0035] In one possible implementation, an acquisition unit is used to acquire battery status information, including a power-on state or a power-off state; a processing unit is used to control the battery to power off when the battery is in a power-on state; or, when the battery is in a power-off state, control the battery to remain in a power-off state.

[0036] In one possible implementation, the concentration information of the target gas is acquired using a non-dispersive infrared (NDIR) gas sensor, which is housed within the chamber.

[0037] In one possible implementation, the power source for the NDIR gas sensor includes one or more of the following: a battery, a power supply from the monitoring unit of a battery cell, or a power supply from the battery management system of the battery.

[0038] Thirdly, a battery leakage detection device is provided, the detection device including a memory and a processor, the memory for storing instructions, and the processor for reading instructions and executing the detection method as described in the first aspect or any possible implementation of the first aspect.

[0039] Fourthly, a battery is provided, the battery including the detection device as described in the second or third aspect above.

[0040] Fifthly, an energy storage system is provided, which includes a battery and a detection device as described in the second or third aspect above.

[0041] In a sixth aspect, a battery leakage detection device is provided. The detection device includes a memory and a processor. The memory is used to store instructions, and the processor is used to read the instructions and execute the detection method as described in the first aspect or any possible implementation of the first aspect.

[0042] In a seventh aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform a detection method as described in the first aspect or any possible implementation thereof.

[0043] Eighthly, a computer program is provided that, when executed by a computer, causes the computer to implement the detection method as described in the first aspect or any possible implementation thereof.

[0044] Ninthly, a computer-readable storage medium is provided for storing a computer program that, when executed by a computer, causes the computer to implement the detection method as described in the first aspect or any possible implementation thereof.

[0045] In a tenth aspect, a computer program product is provided, including computer program instructions that, when executed by a computer, cause the computer to implement the detection method as described in the first aspect or any possible implementation thereof. Attached Figure Description

[0046] Figure 1 is a schematic diagram of the battery structure provided in an embodiment of this application.

[0047] Figure 2 is an architecture diagram of the battery leakage detection system provided in an embodiment of this application.

[0048] Figure 3 is a flowchart illustrating the battery leakage detection method provided in an embodiment of this application.

[0049] Figure 4 is a flowchart illustrating the battery leakage detection method provided in an embodiment of this application.

[0050] Figure 5 is a flowchart illustrating the battery leakage detection method provided in the embodiments of this application.

[0051] Figure 6 is a flowchart illustrating the battery leakage detection method provided in an embodiment of this application.

[0052] Figure 7 is a schematic block diagram of a battery leakage detection device provided in an embodiment of this application.

[0053] Figure 8 is another schematic block diagram of the battery leakage detection device provided in the embodiments of this application. Detailed Implementation

[0054] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0058] Due to their advantages such as high energy density, rechargeability, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0059] Batteries may experience thermal runaway during use. When one or more battery cells experience thermal runaway, heat can be transferred to adjacent cells, potentially leading to fires or explosions. Electrolyte leakage is a significant cause of thermal runaway. Therefore, accurately and effectively detecting electrolyte leaks is a pressing issue that needs to be addressed.

[0060] Therefore, this application provides a method and device for detecting battery leakage. The battery includes a housing and battery cells disposed within the housing. Each battery cell includes an electrolyte. The method includes: acquiring concentration information of a target gas within the housing and acquiring time information of the concentration information, wherein the target gas is a volatile gas of the electrolyte; and determining that the electrolyte has leaked if the concentration of the target gas at a target time is greater than or equal to a target concentration, wherein the target concentration is the sum of the concentration of the target gas before a target time and a preset concentration, and the target time is any time within a first preset time.

[0061] The battery leakage detection method and device provided in this application can accurately and effectively detect electrolyte leakage in batteries.

[0062] Figure 1 is a schematic diagram of the battery structure provided in an embodiment of this application.

[0063] Battery 10 may include one or more battery cells 110.

[0064] In some embodiments, multiple battery cells 110 can be connected in series, parallel, or in a mixed configuration. A mixed configuration refers to a combination of series and parallel connections. Multiple battery cells 110 can directly form a battery 10, or they can first form a battery module, and then the battery module forms the battery 10. For example, multiple battery cells 110 can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form the battery 10.

[0065] In some embodiments, the battery cell 110 may include an electrode assembly and an electrolyte (not shown in the figure), the electrode assembly consisting of a positive electrode, a negative electrode, and a separator. The battery cell 110 mainly operates by the movement of metal ions between the positive and negative electrodes.

[0066] In some embodiments, the battery 10 may further include a housing 120 (or cover), the housing 120 having a hollow interior, and multiple battery cells 110 being housed within the housing 120.

[0067] In some embodiments, the housing 120 may include a first housing portion 121 and a second housing portion 122. The first housing portion 121 and the second housing portion 122 are fastened together to form a housing 120 for accommodating battery cells 110. The shapes of the first housing portion 121 and the second housing portion 122 may be determined according to the shape of a single battery cell 110 or a combination of multiple battery cells 110. For example, both the first housing portion 121 and the second housing portion 122 may be hollow cuboids with only one open side each. The openings of the first housing portion 121 and the second housing portion 122 are opposite to each other, and the first housing portion 121 and the second housing portion 122 are fastened together to form a housing with a closed cavity. Multiple battery cells 110 are placed inside the housing 120 after the first housing portion 121 and the second housing portion 122 are fastened together.

[0068] In some embodiments, the battery 10 may further include a battery management system (BMS) for maintaining and managing the charging and discharging of the battery 10. For example, the system may monitor the state information of the battery 10, such as the state of charge (SOC) information, current information, voltage information, etc., to control the charging and discharging of the battery 10.

[0069] In some embodiments, the battery 10 may also include other structures. For example, the battery 10 may also include a busbar for realizing electrical connections between multiple battery cells 110, such as in parallel, series, or a combination thereof. The busbar can realize electrical connections between battery cells 110 by connecting the electrode terminals of the battery cells 110.

[0070] In some embodiments, a gas concentration acquisition device 130, such as a sensor, may also be provided inside the housing 120. The gas concentration acquisition device 130 can be used to collect one or more of the volatile gases from the electrolyte of the battery cell 110, such as ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and ethylene carbonate (EC).

[0071] In some embodiments, the gas concentration acquisition device 130 can be a sensor such as a non-dispersive infrared (NDIR) gas sensor.

[0072] NDIR gas sensors detect gases based on the principle that gases absorb specific wavelengths of infrared light. The transmittance of infrared light (the ratio of transmitted light intensity to the intensity of emitted light from the radiation source) depends on the concentration of the gas being measured. Non-dispersive infrared light passes through the gas in the optical path, through a narrow-band filter, and reaches the infrared detector. The concentration of the gas is determined by measuring the intensity of the infrared light entering the sensor. When there is no gas in the environment, the light intensity entering the infrared detector is the strongest. When the gas is present, it absorbs some of the infrared light, reducing the intensity of the light entering the detector. Because the internal structures of various gas molecules differ, they selectively absorb different wavelengths of light. Therefore, by analyzing the absorption of infrared light at different wavelengths, the concentration of different gases can be determined.

[0073] In some embodiments, the number of sensors can be one or more.

[0074] In some embodiments, the battery cell 110 may include a pressure relief mechanism for releasing the air pressure inside the battery cell 110. A sensor may be disposed within the housing 120 near the pressure relief mechanism of the battery cell 110.

[0075] It should be understood that the components shown in Figure 1 are just an example. In actual applications, the components may have different names, or they may be added or deleted as needed.

[0076] Figure 2 is a schematic diagram of the architecture of the battery leakage detection system provided in the embodiment of this application.

[0077] The detection system 200 may include a sensor 210, a battery monitoring unit 220, a BMS 230, and a battery fire protection system and / or parameter display device 240, etc.

[0078] Sensor 210 can be used to collect information on the concentration of volatile gases in the electrolyte.

[0079] The battery monitoring unit 220 can be installed inside the battery casing to monitor the status of individual battery cells, such as the current and voltage of the individual battery cells.

[0080] In some embodiments, the power supply of the battery monitoring unit 220 can be used to power the sensor 210.

[0081] Alternatively, the power supply of BMS230 or the battery 10 of Figure 1 can be used to power sensor 210.

[0082] In some embodiments, the BMS230 can acquire concentration information of volatile gases in the electrolyte. For example, sensor 210 acquires the concentration information of volatile gases in the electrolyte and sends the concentration information to the BMS230, which can receive the concentration information. The BMS230 can also acquire the time information of the concentration information acquisition. For example, the BMS230 can also record the time of acquisition of the concentration information while receiving it in real time.

[0083] The concentration information collected by sensor 210 can be directly sent to BMS 230. Alternatively, it can be sent to battery monitoring unit 220 first, and then battery monitoring unit 220 sends the concentration information to BMS 230.

[0084] In some embodiments, the communication method between the sensor 210 and the battery monitoring unit 220 or BMS 230 may include controller area network (CAN), RS-485 protocol, optical fiber, serial peripheral interface (SPI), daisy chain or analog signal, etc.

[0085] In some embodiments, the BMS230 can determine the electrolyte leakage status of the battery, such as whether there is leakage and the level of leakage, based on the concentration information of the electrolyte volatile gases and the time information of collecting the concentration information of the electrolyte volatile gases.

[0086] In some embodiments, the BMS230 can communicate with the battery's fire suppression system and / or parameter display device 240, such as via fiber optic communication. For example, the BMS230 can determine whether electrolyte leakage has occurred, and when leakage occurs, send the leakage information to the battery's fire suppression system and / or parameter display device 240 to facilitate fire suppression by the fire suppression system, and / or to allow personnel to obtain leakage information from the parameter display device so that they can perform operations such as battery maintenance or replacement based on the leakage information.

[0087] It should be understood that the components shown in Figure 2 are just examples. In actual applications, the components may have different names, or they may be added or deleted as needed.

[0088] Figure 3 is a schematic flowchart of a battery leakage detection method provided in an embodiment of this application. The detection method shown in Figure 3 is applicable to the battery in Figure 1 and the detection system shown in Figure 2.

[0089] The battery includes a housing and individual battery cells disposed within the housing, and each individual battery cell includes an electrolyte.

[0090] 310. Obtain the concentration information of the target gas inside the chamber and the time information for collecting the concentration information.

[0091] The target gas is the volatile gas of the electrolyte.

[0092] Electrolytes are usually liquid, but as temperature and pressure change, they can produce volatile gases, which may escape from the battery cells into the casing.

[0093] The volatile gases in an electrolyte can generally include one or more of the following: ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), ethylene carbonate (EC).

[0094] In some embodiments, the BMS can acquire the concentration information of the target gas inside the chamber and the time information of the concentration information acquisition. For example, when the gas concentration collector can acquire the concentration information of the target gas in real time, the BMS can receive the concentration information of the target gas sent by the sensor and record the time of acquisition of the concentration information of the target gas.

[0095] For example, the concentrations of the target gas collected at the first, second, third, fourth, and fifth moments are n1, n2, n3, n4, and n5, respectively.

[0096] 320. If the concentration of the target gas at the target time is greater than or equal to the target concentration, it is determined that the electrolyte has leaked.

[0097] The target concentration is the sum of the concentration of the target gas before the target time and the preset concentration, and the target time is any time within the first preset time.

[0098] In this application, the preset concentration can be an absolute value or a relative value.

[0099] If the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas a certain period ago and the preset concentration within a certain period of time, it is determined that the electrolyte has leaked.

[0100] For example, the target concentration can be the sum of the target gas concentration 5 millimeters prior to the target time and the preset concentration (preset concentration is N). If the target gas concentrations from the 1st to the 5th second are n1 to n5 respectively, then the target concentrations at the 6th, 7th, and 8th seconds of the target time are n1+N, n2+N, and n3+N respectively. Assuming the first preset duration is 3 seconds, if the target gas concentrations collected at the 6th, 7th, and 8th seconds are greater than n1+N, n2+N, and n3+N respectively, then it can be determined that an electrolyte leak has occurred.

[0101] In this embodiment, if the concentration of the target gas at each moment within a first preset time period is greater than or equal to the sum of the concentration of the target gas a certain period prior and a preset concentration, it can be determined that an electrolyte leak has occurred. That is, by comparing the concentration of the target gas within a certain time period with the sum of the concentration of the target gas at another time period prior and a preset concentration, the impact of errors in collecting the concentration of volatile gases from the electrolyte on determining whether an electrolyte leak has occurred can be reduced, improving the accuracy of electrolyte leak detection. This allows for timely battery maintenance when an electrolyte leak occurs, reducing the risk of battery thermal runaway.

[0102] Figure 4 is a schematic flowchart of the battery leakage detection method provided in an embodiment of this application. The battery includes a casing and individual battery cells disposed within the casing, and each individual battery cell includes electrolyte.

[0103] 410. Obtain the concentration information of the target gas inside the chamber and the time information of the concentration information acquisition.

[0104] The target gas is the volatile gas of the electrolyte.

[0105] The description of step 410 can be found in the relevant content of step 310, and will not be repeated here.

[0106] 420a, if the concentration of the target gas at the first target time is greater than or equal to the first target concentration and less than or equal to the second target concentration, it is determined that a first-level leakage of the electrolyte has occurred.

[0107] The first target concentration is the sum of the concentration of the target gas before the first target time and the first preset concentration. The second target concentration is the sum of the concentration of the target gas before the second target time and the second preset concentration. The first target time is any time within the first time window. The first preset time includes the first time window. The target concentration includes the first target concentration.

[0108] The first preset concentration can be an absolute value or a relative value. Similarly, the second preset concentration can be an absolute value or a relative value.

[0109] That is, if, over a continuous period of time, the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time ago at that moment and the first preset concentration, and less than or equal to the sum of the concentration of the target gas some time ago at that moment and the second preset concentration, then a first-level leakage of the electrolyte is determined to have occurred.

[0110] For example, the first target concentration and the second target concentration can be the sum of the target gas concentration 5 millimeters before the target time and the first preset concentration (N1) and the second preset concentration (N2), respectively. If the target gas concentrations from the 1st to the 5th second are n1 to n5, then the first target concentrations at the 6th, 7th, and 8th seconds are n1+N1, n2+N1, and n3+N1, respectively, and the second target concentrations at the 6th, 7th, and 8th seconds are n1+N2, n2+N2, and n3+N2, respectively. Assuming the first time window is 3 seconds, if the target gas concentrations collected at the 6th, 7th, and 8th seconds are greater than n1+N1, n2+N1, and n3+N1, respectively, and less than n1+N2, n2+N2, and n3+N2, respectively, then it can be determined that a first-level leak of the electrolyte has occurred.

[0111] In this embodiment, within the first time window, if the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time ago and a first preset concentration, and less than or equal to the sum of the concentration of the target gas some time ago and a second preset concentration, a first-level electrolyte leak can be determined. By comparing the concentration of the target gas within a certain time period with the sum of the concentration of the target gas in another time period before that time period and the first and second preset concentrations, the error in collecting the concentration of the target gas can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0112] 420b, if the concentration of the target gas at the second target time is greater than or equal to the concentration of the third target, a secondary leakage of the electrolyte is determined.

[0113] The third target concentration is the sum of the concentration of the target gas before the third target duration of the second target time and the third preset concentration. The second target time is any time within the second time window. The first preset duration includes the second time window. The target concentration includes the third target concentration. The third preset concentration is greater than or equal to the second preset concentration.

[0114] In this application, the third preset concentration can be an absolute value or a relative value.

[0115] If, over a sustained period of time, the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time prior at that moment and the third preset concentration, a secondary leakage of the electrolyte is determined to have occurred.

[0116] For example, the third target concentration is the sum of the target gas concentration 5 millimeters before the target time and the third preset concentration (the third preset concentration is N3). If the target gas concentrations from the 1st to the 5th second are n1 to n5 respectively, then the corresponding third target concentrations at the 6th, 7th, and 8th seconds are n1+N3, n2+N3, and n3+N3 respectively. Assuming the second time window is 3 seconds, if the target gas concentrations collected at the 6th, 7th, and 8th seconds are greater than n1+N3, n2+N3, and n3+N3 respectively, then it can be determined that a secondary leakage of the electrolyte has occurred.

[0117] In this embodiment, within the second time window, if the concentration of the target gas at each moment is greater than or equal to the sum of the concentration of the target gas some time ago and the third preset concentration, a secondary leakage of the electrolyte can be determined. By comparing the concentration of the target gas over a period of time with the sum of the concentration of the target gas at another period of time before that time and the third preset concentration, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, thereby enabling a more accurate determination of the level of electrolyte leakage.

[0118] When performing battery leakage detection, 420a and 420b can be performed simultaneously, or 420a or 420b can be performed individually.

[0119] It should be understood that, in the embodiments of this application, the relationship between the size of the first time window and the second time window is not limited. For example, the duration of the first time window may be greater than the duration of the second time window, or the duration of the first time window may be less than the duration of the second time window.

[0120] Figure 5 is a flowchart illustrating the battery leakage detection method provided in an embodiment of this application. The battery includes a casing and individual battery cells disposed within the casing, each battery cell including electrolyte.

[0121] 510, Obtain the concentration information of the target gas inside the chamber and the time information for collecting the concentration information.

[0122] The target gas is the volatile gas of the electrolyte.

[0123] 520a, if the concentration of the target gas at the target time is greater than or equal to the target concentration, it is determined that electrolyte leakage has occurred.

[0124] The target concentration is the sum of the concentration of the target gas before the target time and the preset concentration, and the target time is any time within the first preset time.

[0125] The contents of steps 510 and 520a can be found in the relevant contents of steps 310 and 320, and will not be repeated here.

[0126] 520b, if the concentration of the target gas is greater than or equal to the fourth preset concentration and continues for the second preset duration, it is determined that electrolyte leakage has occurred.

[0127] That is, if the concentration of the target gas remains greater than or equal to the fourth preset concentration for a continuous period of time, it can be determined that the electrolyte has leaked.

[0128] For example, if the concentrations n1, n2, n3, n4, and n5 of the target gas collected over a continuous period of time are all greater than or equal to the fourth preset concentration N4, it can be considered that the electrolyte has leaked.

[0129] In this application, the fourth preset concentration can be an absolute value or a relative value.

[0130] In this embodiment, if the concentration of volatile gases in the electrolyte within the tank remains greater than or equal to a fourth preset concentration for a second preset time period, an electrolyte leak can be determined. By detecting the gas concentration over a period of time, the impact of errors in collecting the concentration of volatile gases from the electrolyte on determining whether an electrolyte leak has occurred can be reduced, thereby improving the accuracy of electrolyte leak detection.

[0131] When performing battery leakage detection, 520a and 520b can be performed simultaneously, or 520a or 520b can be performed individually.

[0132] It should be understood that, in the embodiments of this application, the relationship between the first preset duration and the second preset duration is not limited. For example, the first preset duration may be greater than the second preset duration, or the first preset duration may be less than the second preset duration.

[0133] Similarly, this application does not limit the relationship between the preset concentration in step 520a and the fourth preset concentration in step 520b.

[0134] Figure 6 is a schematic flowchart of the battery leakage detection method provided in an embodiment of this application. The battery includes a casing and individual battery cells disposed within the casing, and each individual battery cell includes electrolyte.

[0135] 610, Obtain the concentration information of the target gas inside the chamber and the time information for collecting the concentration information.

[0136] The target gas is the volatile gas of the electrolyte.

[0137] 620a, if the concentration of the target gas at the first target time is greater than or equal to the first target concentration and less than or equal to the second target concentration, it is determined that a first-level leakage of the electrolyte has occurred.

[0138] The first target concentration is the sum of the concentration of the target gas before the first target time and the first preset concentration. The second target concentration is the sum of the concentration of the target gas before the second target time and the second preset concentration. The first target time is any time within the first time window. The first preset time includes the first time window. The target concentration includes the first target concentration.

[0139] 620b, if the concentration of the target gas at the second target time is greater than or equal to the concentration of the third target, a secondary leakage of the electrolyte is determined.

[0140] The third target concentration is the sum of the concentration of the target gas before the third target duration of the second target time and the third preset concentration. The second target time is any time within the second time window. The first preset duration includes the second time window. The target concentration includes the third target concentration. The third preset concentration is greater than or equal to the second preset concentration.

[0141] The contents of steps 610, 620a and 620b can be found in the descriptions of steps 410, 420a and 420b, and will not be repeated here.

[0142] At 620°C, if the concentration of the target gas is greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration, and this condition persists for the third preset duration, a first-level leakage of the electrolyte is determined.

[0143] That is, if the concentration of the target gas is consistently greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration over a continuous period of time, a first-level leak of the electrolyte is determined to have occurred.

[0144] The fifth preset concentration can be an absolute value or a relative value. Similarly, the sixth preset concentration can be an absolute value or a relative value.

[0145] In some embodiments, the fourth preset concentration in step 520b may include a fifth preset concentration, and the second preset duration in step 520b may include a third preset duration.

[0146] In this embodiment, if the concentration of the target gas is consistently greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration within a third preset time period, a first-level electrolyte leak can be considered to have occurred. That is, by comparing the concentration of the target gas with the fifth and sixth preset concentrations over a period of time, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0147] 620d, if the concentration of the target gas is greater than or equal to the seventh preset concentration and continues for the fourth preset duration, it is determined that a secondary leakage of the electrolyte has occurred.

[0148] The seventh preset concentration is greater than or equal to the sixth preset concentration.

[0149] That is, if the concentration of the target gas remains greater than or equal to the seventh preset concentration for a continuous period of time, it is determined that a secondary leakage of the electrolyte has occurred.

[0150] The seventh preset concentration can be an absolute value or a relative value.

[0151] In the embodiments of this application, the higher the concentration of the target gas, the higher the level of electrolyte leakage and the more serious the electrolyte leakage.

[0152] In some embodiments, the fourth preset concentration in step 520b may include a seventh preset concentration, and the second preset duration in step 520b may include a fourth preset duration.

[0153] In this embodiment, if the concentration of the target gas remains greater than or equal to the seventh preset concentration for a fourth preset time period, a secondary leakage of the electrolyte can be considered to have occurred. That is, by comparing the concentration of the target gas with the seventh preset concentration over a period of time, the error in collecting the concentration of volatile gases from the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0154] It should be understood that the embodiments of this application do not limit the duration of the first time window, the second time window, the third preset duration, and the fourth preset duration.

[0155] In some embodiments, step 630a is performed in the event of a primary electrolyte leak.

[0156] In some embodiments, step 630b is performed in the event of a secondary electrolyte leak.

[0157] 630a, sends Level 1 leak information to the battery's fire suppression system and / or parameter display device.

[0158] Battery fire suppression systems include, for example, fire suppression systems for energy storage systems.

[0159] Battery parameter display devices include, for example, the monitoring backend of the energy storage system and the central control screen of the vehicle.

[0160] For example, a battery fire suppression system can sound an alarm with intermittent blasts when it receives information about a Level 1 leak.

[0161] For example, when the battery parameter display device receives information about a Level 1 leak, it can issue an intermittent alarm sound and display information about a Level 1 electrolyte leak on its screen. Personnel can then promptly and accurately determine the level of battery leakage from the parameter display device, enabling timely and effective maintenance and other procedures.

[0162] In the embodiments of this application, in the event of a first-level electrolyte leak, information about the first-level leak is sent to the battery's fire protection system and / or parameter display device. This enables the fire protection system to react promptly to the electrolyte leak, such as by issuing an alarm, and / or allows personnel to promptly and accurately learn about the electrolyte leakage situation from the parameter display device, so that personnel can take appropriate actions based on the battery leakage situation, such as performing battery maintenance.

[0163] 630b sends information about a secondary leak to the battery's fire suppression system and / or parameter display device.

[0164] For example, when a battery's fire suppression system receives information about a secondary leak, it can sound a continuous alarm and automatically extinguish fires in the event of a fire.

[0165] For example, when a battery parameter display device receives information about a secondary leakage, it can sound a continuous alarm and display the information in red font and on the screen as a flashing icon indicating a secondary electrolyte leakage. Personnel can then promptly and accurately determine the level of battery leakage from the parameter display device, enabling timely and effective maintenance and other treatments.

[0166] In the embodiments of this application, in the event of a secondary leakage of the electrolyte, information about the secondary leakage is sent to the battery's fire suppression system and / or parameter display device. This enables the parameter display device to react promptly to the electrolyte leakage, such as by performing fire extinguishing operations, and / or allows personnel to promptly and accurately learn about the electrolyte leakage situation from the parameter display device, so that personnel can take appropriate actions based on the electrolyte leakage situation, such as performing battery maintenance.

[0167] In some embodiments, steps 640 and 650 may be performed in the event of a secondary electrolyte leak.

[0168] 640, obtain battery status information.

[0169] Battery status information includes whether it is powered on or powered off.

[0170] In this application, the battery status information is obtained in the event of a secondary leakage of the battery's electrolyte.

[0171] 650a controls the battery to power off when the battery is powered on.

[0172] In the event of a secondary leakage of the battery electrolyte, there is a high possibility of fire, explosion, or other problems. Therefore, controlling the battery to shut down while it is powered on can reduce the possibility of fire, explosion, or other problems caused by electrolyte leakage, thereby reducing the risk of personal injury and property damage to users.

[0173] In some embodiments, when the battery is powered on, the battery can be powered off after a period of time has elapsed since secondary leakage of the battery's electrolyte is determined.

[0174] For example, in the event of a secondary electrolyte leak, for electrical equipment such as electric vehicles, the battery can be deactivated a certain period after the leak occurs while the battery is powered on. This provides users with time to move the vehicle or evacuate personnel.

[0175] 650b controls the battery to remain in a powered-off state when the battery is powered off.

[0176] In the event of a secondary leakage of the battery's electrolyte, there is a significant risk of fire or explosion. Therefore, if the battery is in a deactivated state, keeping it in that state reduces the likelihood of electrolyte leakage causing fires or explosions, thus minimizing potential losses to the user's personal safety and property.

[0177] In this embodiment of the application, in the event of a secondary leakage of the battery electrolyte, it is necessary to control the battery to either shut down or remain in a powered-off state to reduce the possibility of the electrolyte leakage causing fires, explosions, or other problems, and to reduce the loss of personal and property safety to users.

[0178] It should be understood that, in this application, the lengths of the first to sixth durations are not limited. For example, the first duration may be greater than the second duration, or the first duration may be equal to the second duration, or the first duration may be less than the second duration.

[0179] In some embodiments, the concentration information of the target gas is acquired using a sensor.

[0180] In some embodiments, the sensor is housed within the enclosure.

[0181] In some embodiments, the concentration information of the target gas is acquired using a non-dispersive infrared (NDIR) gas sensor, which is installed inside the chamber.

[0182] For example, after the NDIR gas sensor collects the concentration information of the target gas in real time, it can send the concentration information directly to the BMS in real time. As another example, the NDIR gas sensor can collect the concentration information of the target gas in real time and send it to the battery monitoring unit shown in Figure 2; the battery monitoring unit then sends the concentration information of the target gas to the BMS in real time.

[0183] In this embodiment, the NDIR gas sensor boasts high accuracy and long lifespan. Using an NDIR gas sensor to collect the concentration of volatile gases from the electrolyte at the collection point can improve the accuracy of electrolyte leakage detection. Furthermore, the NDIR gas sensor is suitable for long-life batteries, reducing the need for disassembly and installation of the battery pack and minimizing battery maintenance.

[0184] In some embodiments, the power source for the NDIR gas sensor includes one or more of the following: a battery, a power source from the monitoring unit of the battery cell, or a power source from the battery management system of the battery.

[0185] The monitoring unit for a single battery cell is, for example, the battery monitoring unit shown in Figure 2.

[0186] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0187] The battery leakage detection method of the present application embodiment has been described in detail above. The battery leakage detection device of the present application embodiment will be described in detail below with reference to FIG7 and FIG8. The technical features described in the method embodiment are applicable to the following device embodiment.

[0188] Figure 7 is a schematic block diagram of a battery leakage detection device provided in an embodiment of this application. As shown in Figure 7, the detection device 4000 includes some or all of the following components: The detection device 4000 may include an acquisition unit 4010 and a processing unit 4020.

[0189] The battery includes a housing and individual battery cells housed within the housing, with each individual battery cell containing an electrolyte.

[0190] The acquisition unit 4010 is used to acquire the concentration information of the target gas inside the box and the time information of the acquisition concentration information. The target gas is the volatile gas of the electrolyte. The processing unit 4020 determines that the electrolyte has leaked when the concentration of the target gas at the target time is greater than or equal to the target concentration. The target concentration is the sum of the concentration of the target gas before the target time and the preset concentration. The target time is any time within the first preset time.

[0191] In some embodiments, the processing unit 4020 is configured to determine that a first-level leakage of the electrolyte has occurred when the concentration of the target gas at a first target time is greater than or equal to a first target concentration and less than or equal to a second target concentration. The first target concentration is the sum of the concentration of the target gas before a first target time and a first preset concentration, and the second target concentration is the sum of the concentration of the target gas before a second target time and a second preset concentration. The first target time is any time within a first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0192] In some embodiments, the processing unit 4020 is configured to determine that a secondary leakage of the electrolyte has occurred when the concentration of the target gas at a second target time is greater than or equal to a third target concentration. The third target concentration is the sum of the concentration of the target gas before a third target time and a third preset concentration. The second target time is any time within a second time window, the first preset time includes the second time window, the target concentration includes the third target concentration, and the third preset concentration is greater than or equal to the second preset concentration.

[0193] In some embodiments, the processing unit 4020 is configured to determine that electrolyte leakage has occurred when the concentration of the target gas is greater than or equal to a fourth preset concentration and continues for a second preset duration.

[0194] In some embodiments, the processing unit 4020 is configured to determine that a first-level leakage of electrolyte has occurred when the concentration of the target gas is greater than or equal to a fifth preset concentration and less than or equal to a sixth preset concentration, and this continues for a third preset duration.

[0195] In some embodiments, the processing unit 4020 is configured to determine that a secondary leakage of electrolyte has occurred when the concentration of the target gas is greater than or equal to a seventh preset concentration and continues for a fourth preset duration, wherein the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0196] In some embodiments, the detection device 4000 further includes a transmitting unit 4030 for transmitting information about a Level 1 leak to the battery's fire suppression system and / or parameter display device.

[0197] In some embodiments, the detection device 4000 further includes a transmitting unit 4030 for transmitting secondary leakage information to the battery's fire protection system and / or parameter display device.

[0198] In some embodiments, the acquisition unit 4010 is used to acquire battery status information, including a power-on state or a power-off state; the processing unit 4020 is used to control the battery to power off when the battery is in a power-on state; or, when the battery is in a power-off state, control the battery to remain in a power-off state.

[0199] In some embodiments, the concentration information of the target gas is acquired using a non-dispersive infrared (NDIR) gas sensor, which is installed inside the chamber.

[0200] In some embodiments, the power source for the NDIR gas sensor includes one or more of the following: a battery, a power source from the monitoring unit of a battery cell, or a power source from the battery management system of the battery.

[0201] For example, both the individual battery monitoring unit and the battery management system of the battery are equipped with low-voltage power supplies.

[0202] It should be understood that the above and other operations and / or functions of the various modules in the battery leakage detection device 4000 are to implement the corresponding processes in the various methods of Figures 3 to 6, and for the sake of brevity, will not be described in detail here.

[0203] Figure 8 shows a schematic block diagram of a battery leakage detection device 5000 according to an embodiment of this application. As shown in Figure 8, the detection device 5000 includes a processor 5010 and a memory 5020, wherein the memory 5020 is used to store instructions, and the processor 5010 is used to read the instructions and execute the detection methods of the various embodiments of this application described above based on the instructions.

[0204] The memory 5020 can be a separate device independent of the processor 5010, or it can be integrated into the processor 5010.

[0205] Optionally, as shown in Figure 8, the battery leakage detection device 5000 may further include a transceiver 5030, and the processor 5010 can control the transceiver 5030 to communicate with other devices. Specifically, it can send information or data to other devices, or receive information or data sent by other devices.

[0206] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the detection method disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0207] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0208] Optionally, embodiments of this application also provide a battery, which includes the detection device provided in embodiments of this application.

[0209] Optionally, embodiments of this application also provide an electrical device, which includes a battery and a detection device provided in embodiments of this application.

[0210] The electrical equipment mentioned in the embodiments of this application may include vehicles, such as electric vehicles, electric cars, etc. The electrical equipment mentioned in the embodiments of this application may also include other battery-powered detection devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, spacecraft, or energy storage systems. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft.

[0211] Optionally, embodiments of this application also provide an energy storage system, which includes a battery and a detection device provided in embodiments of this application.

[0212] This application also provides a chip including a processor for calling and running computer programs from memory.

[0213] Optionally, a device equipped with the chip can execute the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiments of this application, which will not be described in detail here for the sake of brevity.

[0214] This application also provides a computer-readable storage medium for storing computer programs.

[0215] Optionally, the computer-readable storage medium can be applied to the battery leakage detection device in the embodiments of this application, and when the computer program is run on the computer, it causes the computer to execute the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0216] This application also provides a computer program product, including computer program instructions.

[0217] Optionally, the computer program product can be applied to the battery leakage detection device in the embodiments of this application, and when the computer program instructions are run on the computer, the computer executes the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0218] This application also provides a computer program.

[0219] Optionally, the computer program can be applied to the battery leakage detection device in the embodiments of this application. When the computer program is run on a computer, it causes the computer to execute the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0220] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0221] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0222] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the detection apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of this application may be through some interfaces, indirect coupling or communication connection of devices or units, and may be electrical, mechanical, or other forms.

[0223] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0224] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0225] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0226] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting battery leakage, characterized in that, The battery includes a housing and battery cells disposed within the housing, each battery cell including an electrolyte. The method includes: The concentration information of the target gas inside the box and the time information for collecting the concentration information are obtained, wherein the target gas is the volatile gas of the electrolyte; If the concentration of the target gas at the target time is greater than or equal to the target concentration, it is determined that the electrolyte has leaked. The target concentration is the sum of the concentration of the target gas before the target time and the preset concentration. The target time is any time within the first preset time. Determining that the electrolyte leaks when the concentration of the target gas is greater than or equal to the target concentration at a target time includes: If the concentration of the target gas at a first target time is greater than or equal to the first target concentration and less than or equal to the second target concentration, it is determined that the electrolyte has experienced a first-level leakage. The first target concentration is the sum of the concentration of the target gas before the first target time and the first preset concentration, and the second target concentration is the sum of the concentration of the target gas before the second target time and the second preset concentration. The first target time is any time within a first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

2. The detection method according to claim 1, characterized in that, Determining that the electrolyte leaks when the concentration of the target gas is greater than or equal to the target concentration at a target time includes: If the concentration of the target gas at the second target time is greater than or equal to the third target concentration, it is determined that the electrolyte has experienced a secondary leakage. The third target concentration is the sum of the concentration of the target gas before the third target time and the third preset concentration. The second target time is any time within the second time window. The first preset time includes the second time window. The target concentration includes the third target concentration. The third preset concentration is greater than or equal to the second preset concentration.

3. The detection method according to claim 1, characterized in that, The detection method further includes: If the concentration of the target gas is greater than or equal to a fourth preset concentration and continues for a second preset duration, it is determined that the electrolyte has leaked.

4. The detection method according to claim 1, characterized in that, The detection method further includes: If the concentration of the target gas is greater than or equal to a fifth preset concentration and less than or equal to a sixth preset concentration, and this condition persists for a third preset duration, it is determined that a first-level leakage has occurred in the electrolyte.

5. The detection method according to claim 4, characterized in that, The detection method further includes: If the concentration of the target gas is greater than or equal to a seventh preset concentration and continues for a fourth preset duration, it is determined that the electrolyte has experienced a secondary leakage, wherein the seventh preset concentration is greater than or equal to the sixth preset concentration.

6. The detection method according to claim 1 or 4, characterized in that, The method further includes: The information regarding the first-level leak is sent to the battery's fire suppression system and / or parameter display device.

7. The detection method according to claim 2 or 5, characterized in that, The method further includes: Information about the secondary leak is sent to the battery's fire suppression system and / or parameter display device.

8. The detection method according to claim 2 or 5, characterized in that, The method further includes: Obtain the status information of the battery, including the power-on status or power-off status; When the battery is powered on, control the battery to power off; or... When the battery is in a powered-off state, control the battery to remain in a powered-off state.

9. The detection method according to claim 1, characterized in that, The concentration information of the target gas is collected using a non-dispersive infrared (NDIR) gas sensor, which is installed inside the chamber.

10. The detection method according to claim 9, characterized in that, The power source for the NDIR gas sensor includes one or more of the following: the battery, the power supply of the monitoring unit of the battery cell, or the power supply of the battery management system.

11. A battery leakage detection device, characterized in that, The battery includes a housing and battery cells disposed within the housing, each battery cell including an electrolyte. The device includes: The acquisition unit is used to acquire the concentration information of the target gas inside the box and the time information of acquiring the concentration information, wherein the target gas is the volatile gas of the electrolyte; The processing unit is used to determine that the electrolyte has leaked when the concentration of the target gas at a target time is greater than or equal to the target concentration. The target concentration is the sum of the concentration of the target gas before the target time and the preset concentration. The target time is any time within the first preset time. The processing unit is configured to determine that a first-level leakage has occurred in the electrolyte when the concentration of the target gas at a first target time is greater than or equal to a first target concentration and less than or equal to a second target concentration. The first target concentration is the sum of the concentration of the target gas before a first target time and a first preset concentration, and the second target concentration is the sum of the concentration of the target gas before a second target time and a second preset concentration. The first target time is any time within a first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

12. The detection device according to claim 11, characterized in that, The processing unit is configured to determine that a secondary leakage has occurred in the electrolyte when the concentration of the target gas at a second target time is greater than or equal to a third target concentration. The target time includes the second target time, the third target concentration is the sum of the concentration of the target gas before a third target duration from the second target time and a third preset concentration, the second target time is any time within a second time window, the first preset duration includes the second time window, the target concentration includes the third target concentration, and the third preset concentration is greater than or equal to the second preset concentration.

13. The detection device according to claim 11, characterized in that, The processing unit is used to determine that the electrolyte has leaked when the concentration of the target gas is greater than or equal to a fourth preset concentration and continues for a second preset duration.

14. The detection device according to claim 11, characterized in that, The processing unit is used to determine that the electrolyte has experienced a first-level leak when the concentration of the target gas is greater than or equal to a fifth preset concentration and less than or equal to a sixth preset concentration, and this continues for a third preset duration.

15. The detection device according to claim 14, characterized in that, The processing unit is used to determine that the electrolyte has experienced a secondary leakage when the concentration of the target gas is greater than or equal to a seventh preset concentration and continues for a fourth preset duration, wherein the seventh preset concentration is greater than or equal to the sixth preset concentration.

16. The detection device according to claim 11 or 14, characterized in that, The device further includes: A transmitting unit is used to transmit information about the first-level leakage to the battery's fire protection system and / or parameter display device.

17. The detection device according to claim 12 or 15, characterized in that, The device further includes: A transmitting unit is used to send information about the secondary leakage to the battery's fire protection system and / or parameter display device.

18. The detection device according to claim 12 or 15, characterized in that, The acquisition unit is used to acquire the status information of the battery, including the power-on status or the power-off status; The processing unit is configured to control the battery to power off when the battery is powered on; or, When the battery is in a powered-off state, control the battery to remain in a powered-off state.

19. The detection device according to claim 11, characterized in that, The concentration information of the target gas is collected using a non-dispersive infrared (NDIR) gas sensor, which is installed inside the chamber.

20. The detection device according to claim 19, characterized in that, The power source for the NDIR gas sensor includes one or more of the following: the battery, the power supply of the monitoring unit of the battery cell, or the power supply of the battery management system.

21. A battery leakage detection device, characterized in that, The detection device includes a memory and a processor. The memory is used to store instructions, and the processor is used to read the instructions and execute the detection method as described in any one of claims 1 to 10 according to the instructions.

22. A battery, characterized in that, The battery includes the detection device as described in any one of claims 11 to 21.

23. An energy storage system, characterized in that, The energy storage system includes a battery and a detection device as described in any one of claims 11 to 21.

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