Battery leakage detection method, detection device, battery and energy storage system

Abstract

The embodiments of the present application provide a method for detecting battery leakage, a detection device, a battery, and an energy storage system. The battery includes a housing and a battery cell disposed in the housing. The battery cell includes an electrolyte. The method includes: obtaining the concentration information of a target gas in the housing and the time information of collecting the concentration information. The target gas is a volatile gas of the electrolyte. When the concentration of the target gas at a target moment 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 at the target moment and the preset concentration. The target moment is any moment within the first preset time. The method for detecting battery leakage, the detection device, the battery, and the energy storage system provided in the embodiments of the present application can accurately and effectively detect the leakage of the electrolyte in the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery leakage detection method, a detection device, a battery and an energy storage system. Background Art

[0002] Due to its advantages such as high energy density, rechargeable and environmental protection, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] Batteries may experience thermal runaway during use. When one or more battery cells experience thermal runaway, the heat will be transferred to adjacent battery cells, which may cause fire or explosion at any time. The leakage of electrolyte in the battery is one of the important reasons for thermal runaway. Therefore, how to accurately and effectively detect the leakage of electrolyte has become an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a battery leakage detection method, a detection device, a battery and an energy storage system, which can accurately and effectively detect the leakage of electrolyte in the battery.

[0005] In a first aspect, a method for detecting battery leakage is provided, wherein the battery comprises a housing and a battery cell disposed in the housing, the battery cell comprising an electrolyte, and the detection method comprises: obtaining concentration information of a target gas in the housing and time information of collecting the concentration information, wherein the target gas is a volatile gas of the electrolyte; when the concentration of the target gas at a target moment is greater than or equal to a target concentration, determining that an electrolyte leakage has occurred, wherein the target concentration is the sum of the concentration of the target gas before a target time at the target moment and a preset concentration, and the target moment is any moment within a first preset time.

[0006] In the embodiment of the present application, when the concentration of the target gas at each moment within the first preset time period is greater than or equal to the sum of the concentration of the target gas a period of time before the moment and the preset concentration, it can be determined that the electrolyte has leaked. That is, by comparing the concentration of the target gas in a period of time with the sum of the concentration of the target gas in another period of time before the period of time and the preset concentration, the influence of the error in collecting the concentration of the volatile gas of the electrolyte on the judgment of whether the electrolyte has leaked can be reduced, and the accuracy of the electrolyte leakage detection can be improved, so that the battery can be maintained in time when the electrolyte leaks, reducing the risk of thermal runaway of the battery.

[0007] In one possible implementation, when the concentration of the target gas at the first target moment 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 primary leakage of the electrolyte occurs, the first target concentration is the sum of the concentration of the target gas before the first target time length at the first target moment and the first preset concentration, the second target concentration is the sum of the concentration of the target gas before the second target time length at the first target moment and the second preset concentration, the first target moment is any moment within the first time window, the first preset time length includes the first preset time window, and the target concentration includes the first target concentration.

[0008] In the embodiment of the present application, 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 a period of time before the moment and the first preset concentration, and less than or equal to the sum of the concentration of the target gas a period of time before the moment and the second preset concentration, it can be determined that the electrolyte has a primary leakage. By comparing the concentration of the target gas within a period of time with the concentration of the target gas in another period of time before the period of time and the sum of the first preset concentration and the second preset concentration, the error in collecting the concentration of the target gas can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0009] In one possible implementation, when the concentration of the target gas at the second target moment 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 at the second target moment and the third preset concentration, the second target moment is any moment 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.

[0010] In the embodiment of the present application, 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 a period of time before the moment and the third preset concentration, it can be determined that the electrolyte has a secondary leakage. By comparing the concentration of the target gas in a period of time with the sum of the concentration of the target gas in another period of time before the period of time and the third preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, so that the level of electrolyte leakage can be determined more accurately.

[0011] In a possible implementation, the detection method further includes: determining that leakage of the electrolyte occurs when the concentration of the target gas is greater than or equal to a fourth preset concentration and lasts for a second preset time period.

[0012] In the embodiment of the present application, when the concentration of the volatile gas of the electrolyte in the box is always greater than or equal to the fourth preset concentration within the second preset time, it can be determined that the electrolyte has leaked. By detecting the gas concentration over a period of time, the influence of the error in collecting the concentration of the volatile gas of the electrolyte on the judgment of whether the electrolyte has leaked can be reduced, thereby improving the accuracy of the electrolyte leakage detection.

[0013] In a possible implementation, the detection method further includes: determining that a primary leakage of the electrolyte occurs 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 lasts for a third preset time period.

[0014] In the embodiment of the present application, when the concentration of the target gas is always greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration within the third preset time period, it can be considered that the electrolyte has a primary leakage. That is, by comparing the relationship between the concentration of the target gas within a period of time and the fifth preset concentration and the sixth preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0015] In a possible implementation, the detection method further includes: when the concentration of the target gas is greater than or equal to a seventh preset concentration and lasts for a fourth preset time period, determining that a secondary leakage of the electrolyte occurs, and the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0016] In the embodiment of the present application, when the concentration of the target gas is always greater than or equal to the seventh preset concentration within the fourth preset time period, it can be considered that the electrolyte has a secondary leakage. That is, by comparing the relationship between the concentration of the target gas within a period of time and the seventh preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0017] In a possible implementation, the detection method further includes: sending information of the first-level leakage to a fire protection system and / or a parameter display device of the battery.

[0018] In an embodiment of the present application, in the event of a primary leakage of the electrolyte, information about the primary leakage is sent to the fire protection system and / or parameter display device of the battery, so that the fire protection system can respond to the electrolyte leakage in a timely manner, such as by alarm operation, and / or, so that personnel can promptly and accurately learn about the electrolyte leakage from the parameter display device, so that personnel can perform operations such as maintenance on the battery according to the battery leakage situation.

[0019] In a possible implementation manner, the detection method further includes: sending secondary leakage information to a fire protection system and / or a parameter display device of the battery.

[0020] In an embodiment of the present application, in the event of a secondary leakage of the electrolyte, information about the secondary leakage is sent to the fire protection system and / or parameter display device of the battery, so that the parameter display device can respond to the electrolyte leakage in a timely manner, such as performing a fire extinguishing operation, and / or, so that personnel can promptly and accurately learn about the electrolyte leakage from the parameter display device, so that the personnel can perform operations such as maintaining the battery according to the electrolyte leakage situation.

[0021] In a possible implementation, the detection method also includes: obtaining status information of the battery, the status information including a power-on state or a power-off state; when the battery is in a power-on state, controlling the battery to power off; or, when the battery is in a power-off state, controlling the battery to remain in a power-off state.

[0022] In the embodiment of the present application, in the event of a secondary leakage of the battery electrolyte, it is necessary to control the battery to be powered off or remain powered off to reduce the possibility of fire, explosion and other problems caused by electrolyte leakage, and reduce the loss of personal and property safety of users.

[0023] In a possible implementation, the concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is disposed in a box.

[0024] In the embodiment of the present application, the NDIR gas sensor has high accuracy and long life. The concentration of volatile gas from the electrolyte collected by the NDIR gas sensor can improve the accuracy of the battery electrolyte leakage detection. At the same time, the NDIR gas sensor can be applied to long-life batteries, which can reduce the disassembly and installation of the battery box and reduce the maintenance of the battery.

[0025] In a possible implementation, the power supply source of the NDIR gas sensor includes one or more of a battery, a power supply of a monitoring unit of a battery cell, or a power supply of a battery management system of the battery.

[0026] In a second aspect, a battery leakage detection device is provided, wherein the battery comprises a housing and a battery cell arranged in the housing, the battery cell comprises an electrolyte, and the detection device comprises: an acquisition unit, for acquiring concentration information of a target gas in the housing and time information of acquiring the concentration information, the target gas being a volatile gas of the electrolyte; and a processing unit, for determining that an electrolyte leakage has occurred when the concentration of the target gas at a target moment is greater than or equal to a target concentration, the target concentration being the sum of the concentration of the target gas before a target time at the target moment and a preset concentration, the target moment being any moment within a first preset time.

[0027] In one possible implementation, a processing unit is used to determine that a primary leakage of the electrolyte occurs when the concentration of the target gas at a first target moment 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 a first target time at the first target moment and a first preset concentration, the second target concentration is the sum of the concentration of the target gas before a second target time at the first target moment and the second preset concentration, the first target moment is any moment within a first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0028] In one possible implementation, the processing unit is used to determine that a secondary leakage of the electrolyte occurs when the concentration of the target gas at the second target moment is greater than or equal to a third target concentration, the third target concentration being the sum of the concentration of the target gas before a third target time period at the second target moment and a third preset concentration, the second target moment being any moment within the second time window, the first preset time period including the second time window, the target concentration including the third target concentration, and the third preset concentration being greater than or equal to the second preset concentration.

[0029] In a possible implementation, the processing unit is configured to determine that leakage of the electrolyte occurs when the concentration of the target gas is greater than or equal to a fourth preset concentration and lasts for a second preset time period.

[0030] In a possible implementation, the processing unit is used to determine that a primary leakage of the electrolyte occurs 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 lasts for a third preset time period.

[0031] In one possible implementation, the processing unit is used to determine that a secondary leakage of the electrolyte occurs when the concentration of the target gas is greater than or equal to a seventh preset concentration and lasts for a fourth preset time period, and the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0032] In a possible implementation, the detection device further includes: a sending unit, configured to send information of the first-level leakage to a fire protection system and / or a parameter display device of the battery.

[0033] In a possible implementation, the detection device further includes: a sending unit, configured to send information of the secondary leakage to a fire protection system and / or a parameter display device of the battery.

[0034] In one possible implementation, the acquisition unit is used to acquire status information of the battery, where the status information includes a power-on status or a power-off status; the processing unit is used to control the battery to power off when the battery is in the power-on status; or, when the battery is in the power-off status, control the battery to remain in the power-off status.

[0035] In a possible implementation, the concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is disposed in a box.

[0036] In a possible implementation, the power supply source of the NDIR gas sensor includes one or more of a battery, a power supply of a monitoring unit of a battery cell, or a power supply of a battery management system of the battery.

[0037] In a third aspect, a battery leakage detection device is provided, the detection device comprising a memory and a processor, the memory being used to store instructions, the processor being used to read instructions and execute, according to the instructions, a detection method as described in the first aspect or any possible implementation of the first aspect.

[0038] In a fourth aspect, a battery is provided, wherein the battery comprises the detection device according to the second aspect or the third aspect.

[0039] In a fifth aspect, an energy storage system is provided, the energy storage system comprising a battery and a detection device as described in the second aspect or the third aspect above.

[0040] In a sixth aspect, a battery leakage detection device is provided, the detection device comprising a memory and a processor, the memory being used to store instructions, the processor being used to read the instructions and execute, according to the instructions, a detection method as in the first aspect or any possible implementation of the first aspect.

[0041] In a seventh aspect, a chip is provided, comprising: a processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a detection method as in the first aspect or any possible implementation of the first aspect.

[0042] In an eighth aspect, a computer program is provided. When the computer program is executed by a computer, the computer implements the detection method in the first aspect or any possible implementation manner of the first aspect.

[0043] In a ninth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer implements the detection method in the first aspect or any possible implementation of the first aspect.

[0044] In a tenth aspect, a computer program product is provided, comprising computer program instructions, which, when executed by a computer, enable the computer to implement a detection method as in the first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0046] Figure 2 This is an architectural diagram of a battery leakage detection system provided in an embodiment of the present application.

[0047] Figure 3 A schematic diagram of the flow chart of a battery leakage detection method provided in an embodiment of the present application.

[0048] Figure 4 A schematic diagram of the flow chart of a battery leakage detection method provided in an embodiment of the present application.

[0049] Figure 5 A schematic diagram of the flow chart of a battery leakage detection method provided in an embodiment of the present application.

[0050] Figure 6 A schematic diagram of the flow chart of a battery leakage detection method provided in an embodiment of the present application.

[0051] Figure 7 It is a schematic block diagram of a battery leakage detection device provided in an embodiment of the present application.

[0052] Figure 8 This is another schematic block diagram of the battery leakage detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] The term "and / or" is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] Due to its advantages such as high energy density, rechargeable and environmental protection, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0058] Batteries may experience thermal runaway during use. When one or more battery cells experience thermal runaway, the heat will be transferred to adjacent battery cells, which may cause fire or explosion at any time. The leakage of electrolyte in the battery is one of the important reasons for thermal runaway. Therefore, how to accurately and effectively detect the leakage of electrolyte has become an urgent problem to be solved.

[0059] To this end, the present application provides a battery leakage detection method and detection device, the battery comprising a housing and a battery cell arranged in the housing, the battery cell comprising an electrolyte, the method comprising: obtaining concentration information of a target gas in the housing and time information of collecting the concentration information, the target gas being a volatile gas of the electrolyte; determining that leakage of the electrolyte occurs when the concentration of the target gas is greater than or equal to a target concentration at a target time, the target concentration being the sum of the concentration of the target gas before a target time at the target time and a preset concentration, the target time being any time within a first preset time.

[0060] The battery leakage detection method and detection device provided in the embodiments of the present application can accurately and effectively detect the leakage of electrolyte in the battery.

[0061] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0062] The battery 10 may include one or more battery cells 110 .

[0063] In some embodiments, multiple battery cells 110 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series connection and parallel connection. Multiple battery cells 110 can directly form a battery 10, or they can first form a battery module, and then the battery module can form a battery 10. For example, multiple battery cells 110 can first be connected in series, in parallel, or in a hybrid connection to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a battery 10.

[0064] In some embodiments, the battery cell 110 may include an electrode assembly and an electrolyte (not shown in the figure), wherein the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 110 mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0065] In some embodiments, the battery 10 may further include a box body 120 (or a cover body), the interior of the box body 120 is a hollow structure, and the plurality of battery cells 110 are accommodated in the box body 120 .

[0066] In some embodiments, the case 120 may include a first case 121 and a second case 122. The first case 121 and the second case 122 are buckled together to form a case 120 that accommodates the battery cells 110. The shapes of the first case 121 and the second case 122 may be determined according to the shape of one battery cell 110 or the combined shape of multiple battery cells 110. For example, the first case 121 and the second case 122 may both be hollow cuboids and each may have only one open face, the opening of the first case 121 and the opening of the second case 122 are arranged opposite to each other, and the first case 121 and the second case 122 are buckled together to form a case with a closed chamber. Multiple battery cells 110 are placed in the case 120 after the first case 121 and the second case 122 are buckled.

[0067] 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 status information of the battery 10, such as the state of charge (SOC) information, current information, voltage information, etc. of the battery 10, may be monitored to control the charging and discharging of the battery 10.

[0068] In some embodiments, the battery 10 may further include other structures. For example, the battery 10 may further include a busbar component, which is used to realize electrical connection between multiple battery cells 110, such as parallel connection, series connection, or mixed connection. The busbar component can realize electrical connection between the battery cells 110 by connecting the electrode terminals of the battery cells 110.

[0069] In some embodiments, a gas concentration collection device 130 such as a sensor may be provided in the box 120. The gas concentration collection device 130 may be used to collect one or more of the volatile gases of the electrolyte of the battery cell 110, such as ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), ethylene carbonate (EC), etc.

[0070] In some embodiments, the gas concentration collection device 130 may be a sensor such as a non-dispersive infrared (NDIR) gas sensor.

[0071] NDIR gas sensors detect gases based on the principle that gases can absorb infrared rays of specific wavelengths. The transmittance of infrared rays (the ratio of the intensity of transmitted light to the intensity of radiated light from the radiation source) depends on the concentration of the gas being measured. Non-dispersive infrared light passes through the gas being measured in the optical path, passes through a narrowband filter, and reaches the infrared detector. The concentration of the gas being measured is determined by measuring the intensity of the infrared light entering the infrared sensor. When there is no gas being measured in the environment, the light intensity entering the infrared detector is the strongest. When there is a gas being measured in the environment, the gas being measured absorbs part of the infrared light, and the light intensity entering the infrared detector is weakened. Due to the different internal structures of various gas molecules, they determine their selective absorption of light of different wavelengths. Therefore, by analyzing the absorption of infrared light of different wavelengths, the concentration of different gases can be determined.

[0072] In some embodiments, the number of sensors may be one or more.

[0073] In some embodiments, the battery cell 110 may include a pressure relief mechanism for releasing the gas pressure inside the battery cell 110. The sensor may be disposed in the box 120 at a position close to the pressure relief mechanism of the battery cell 110.

[0074] It should be understood that Figure 1 The components shown are only examples. In actual applications, the components may have different names, or the components may be added or deleted according to actual needs.

[0075] Figure 2 A schematic diagram of the architecture of a battery leakage detection system provided in an embodiment of the present application.

[0076] 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.

[0077] The sensor 210 may be used to collect concentration information of volatile gases in the electrolyte.

[0078] The battery monitoring unit 220 may be disposed in a battery box to monitor the status of the battery cells, such as the current, voltage and other status information of the battery cells.

[0079] In some embodiments, the power supply of battery monitoring unit 220 may be used to power sensor 210 .

[0080] Optionally, the power supply of BMS 230 or Figure 1 The battery 10 can be used to power the sensor 210.

[0081] In some embodiments, the BMS 230 may obtain concentration information of volatile gases of the electrolyte. For example, the sensor 210 collects concentration information of volatile gases of the electrolyte and sends the concentration information to the BMS 230, and the BMS 230 may receive the concentration information. The BMS 230 may also obtain time information of collecting the concentration information. For example, the BMS 230 may also record the time of collecting the concentration information while receiving the concentration information in real time.

[0082] The concentration information collected by the sensor 210 may be directly sent to the BMS 230 , or may be first sent to the battery monitoring unit 220 , which then sends the concentration information to the BMS 230 .

[0083] In some embodiments, the communication method between the sensor 210 and the battery monitoring unit 220 or the BMS 230 may include a controller area network (CAN), RS-485 protocol, optical fiber, serial peripheral interface (SPI), daisy chain or analog quantity, etc.

[0084] In some embodiments, the BMS 230 may determine the electrolyte leakage of the battery, such as whether there is leakage, leakage level, etc., based on the concentration information of the electrolyte volatile gas and the time information of collecting the concentration information of the electrolyte volatile gas.

[0085] In some embodiments, the BMS 230 may communicate with the fire protection system and / or parameter display device 240 of the battery, such as by using optical fiber. For example, the BMS 230 may determine whether the electrolyte is leaking, and when the electrolyte is leaking, the leakage information is sent to the fire protection system and / or parameter display device 240 of the battery, so that the fire protection system can perform fire extinguishing treatment, and / or, so that the leakage information can be obtained from the parameter display device, so that the personnel can perform operations such as battery maintenance or replacement according to the leakage information.

[0086] It should be understood that Figure 2 The components shown are only examples. In actual applications, the components may have different names, or the components may be added or deleted according to actual needs.

[0087] Figure 3 A schematic diagram of the flow chart of a battery leakage detection method provided in an embodiment of the present application. Figure 3 The assay shown is suitable for Figure 1 Batteries and Figure 2 The detection system shown.

[0088] The battery comprises a box body and a battery cell arranged in the box body, and the battery cell comprises an electrolyte.

[0089] 310, obtaining concentration information of the target gas in the box and time information of collecting the concentration information.

[0090] The target gas is the volatilized gas of the electrolyte.

[0091] The electrolyte is usually in liquid form, but as the temperature and pressure change, the electrolyte will produce volatile gases, and these gases may escape from the battery cells into the box.

[0092] The volatile gas of the electrolyte may generally include one or more gases such as ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), ethylene carbonate (EC), etc.

[0093] In some embodiments, the BMS can obtain the concentration information of the target gas in the box and the time information of collecting the concentration information. For example, when the gas concentration collector can collect 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 collecting the concentration information of the target gas.

[0094] For example, the concentrations of the target gas collected at the first moment, the second moment, the third moment, the fourth moment, and the fifth moment are n1, n2, n3, n4, and n5, respectively.

[0095] 320 , when 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 is leaking.

[0096] The target concentration is the sum of the concentration of the target gas before the target time at the target moment and the preset concentration, and the target moment is any moment within the first preset time.

[0097] In the present application, the preset concentration may be an absolute value or a relative value.

[0098] If, within a period of time (a first preset time period), 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 period of time before the moment and the preset concentration, it is determined that the electrolyte has leaked.

[0099] For example, the target concentration may be the sum of the concentration of the target gas 5 mm before the target moment and the preset concentration (the preset concentration is N). If the concentrations of the target gas from the 1st second to the 5th second are n1 to n5, respectively, then the corresponding target concentrations at the 6th second, 7th second, and 8th second are n1+N, n2+N, and n3+N, respectively. Assuming that the first preset time is 3 seconds, if the concentrations of the target gas collected at the 6th second, 7th second, and 8th second are greater than n1+N, n2+N, and n3+N, respectively, then it can be determined that the electrolyte has leaked.

[0100] In the embodiment of the present application, when the concentration of the target gas at each moment within the first preset time period is greater than or equal to the sum of the concentration of the target gas a period of time before the moment and the preset concentration, it can be determined that the electrolyte has leaked. That is, by comparing the concentration of the target gas in a period of time with the sum of the concentration of the target gas in another period of time before the period of time and the preset concentration, the influence of the error in collecting the concentration of the volatile gas of the electrolyte on the judgment of whether the electrolyte has leaked can be reduced, and the accuracy of the electrolyte leakage detection can be improved, so that the battery can be maintained in time when the electrolyte leaks, reducing the risk of thermal runaway of the battery.

[0101] Figure 4 The figure is a flow chart of a battery leakage detection method provided in an embodiment of the present application. The battery comprises a box body and a battery cell arranged in the box body, and the battery cell comprises an electrolyte.

[0102] 410, obtaining concentration information of the target gas in the box and time information of collecting the concentration information.

[0103] The target gas is the volatilized gas of the electrolyte.

[0104] The description of step 410 may refer to the relevant content of step 310, and this application will not elaborate on it here.

[0105] 420a, when 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 primary leakage of the electrolyte occurs.

[0106] The first target concentration is the sum of the concentration of the target gas before the first target time at the first target moment and the first preset concentration. The second target concentration is the sum of the concentration of the target gas before the second target time at the first target moment and the second preset concentration. The first target moment is any moment within the first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0107] The first preset concentration may be an absolute value or a relative value. Similarly, the second preset concentration may be an absolute value or a relative value.

[0108] 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 before that moment and the first preset concentration, and is less than or equal to the sum of the concentration of the target gas some time before that moment and the second preset concentration, it is determined that a primary leakage of the electrolyte has occurred.

[0109] For example, the first target concentration and the second target concentration may be the concentration of the target gas 5 mm before the target moment and the sum of the first preset concentration (the first preset concentration is N1) and the second preset concentration (the second preset concentration is N2). If the concentrations of the target gas corresponding to the 1st to 5th seconds are n1 to n5, respectively, then the first target concentrations corresponding to the 6th, 7th and 8th seconds are n1+N1, n2+N1 and n3+N1, respectively, and the second target concentrations corresponding to the 6th, 7th and 8th seconds are n1+N2, n2+N2 and n3+N2, respectively. Assuming that the first time window is 3 seconds, if the concentrations of the target gas 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 primary leakage of the electrolyte occurs.

[0110] In the embodiment of the present application, 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 a period of time before the moment and the first preset concentration, and less than or equal to the sum of the concentration of the target gas a period of time before the moment and the second preset concentration, it can be determined that the electrolyte has a primary leakage. By comparing the concentration of the target gas within a period of time with the concentration of the target gas in another period of time before the period of time and the sum of the first preset concentration and the second preset concentration, the error in collecting the concentration of the target gas can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0111] 420b, when 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 occurs.

[0112] The third target concentration is the sum of the concentration of the target gas before the third target time at the second target moment and the third preset concentration. The second target moment is any moment within the second time window. The first preset time window 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.

[0113] In the present application, the third preset concentration may be an absolute value or a relative value.

[0114] 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 before the moment and the third preset concentration, it is determined that a secondary leakage of the electrolyte occurs.

[0115] For example, the third target concentration is the sum of the concentration of the target gas 5 mm before the target moment and the third preset concentration (the third preset concentration is N3). If the concentrations of the target gas corresponding to the 1st to 5th seconds are n1 to n5, respectively, then the third target concentrations corresponding to the 6th, 7th, and 8th seconds are n1+N3, n2+N3, and n3+N3, respectively. Assuming that the second time window is 3 seconds, if the concentrations of the target gas 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 occurs.

[0116] In the embodiment of the present application, 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 a period of time before the moment and the third preset concentration, it can be determined that the electrolyte has a secondary leakage. By comparing the concentration of the target gas in a period of time with the sum of the concentration of the target gas in another period of time before the period of time and the third preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, so that the level of electrolyte leakage can be determined more accurately.

[0117] When performing battery leakage detection, the above 420a and 420b may be performed simultaneously, or 420a or 420b may be performed separately.

[0118] It should be understood that in the embodiment of the present application, the size relationship between 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.

[0119] Figure 5 The figure is a flow chart of a battery leakage detection method provided in an embodiment of the present application. The battery comprises a box body and a battery cell arranged in the box body, and the battery cell comprises an electrolyte.

[0120] 510, obtaining concentration information of the target gas in the box and time information of collecting the concentration information.

[0121] The target gas is the volatilized gas of the electrolyte.

[0122] 520a, when 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 is leaking.

[0123] The target concentration is the sum of the concentration of the target gas before the target time at the target moment and the preset concentration, and the target moment is any moment within the first preset time.

[0124] The contents of step 510 and step 520a can refer to the relevant contents of step 310 and step 320, and this application will not elaborate on them here.

[0125] 520b, when the concentration of the target gas is greater than or equal to a fourth preset concentration and lasts for a second preset time period, it is determined that the electrolyte is leaking.

[0126] That is, if the concentration of the target gas is always greater than or equal to the fourth preset concentration over a continuous period of time, it can be determined that the electrolyte has leaked.

[0127] 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.

[0128] In the present application, the fourth preset concentration may be an absolute value or a relative value.

[0129] In the embodiment of the present application, when the concentration of the volatile gas of the electrolyte in the box is always greater than or equal to the fourth preset concentration within the second preset time, it can be determined that the electrolyte has leaked. By detecting the gas concentration over a period of time, the influence of the error in collecting the concentration of the volatile gas of the electrolyte on the judgment of whether the electrolyte has leaked can be reduced, thereby improving the accuracy of the electrolyte leakage detection.

[0130] When performing battery leakage detection, the above 520a and 520b may be performed simultaneously, or 520a or 520b may be performed separately.

[0131] It should be understood that in the embodiment of the present application, the magnitude 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.

[0132] Similarly, the present application does not limit the magnitude relationship between the preset concentration in step 520a and the fourth preset concentration in step 520b.

[0133] Figure 6 The figure is a flow chart of a battery leakage detection method provided in an embodiment of the present application. The battery comprises a box body and a battery cell arranged in the box body, and the battery cell comprises an electrolyte.

[0134] 610, obtaining concentration information of the target gas in the box and time information of collecting the concentration information.

[0135] The target gas is the volatilized gas of the electrolyte.

[0136] 620a, when 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 primary leakage of the electrolyte occurs.

[0137] The first target concentration is the sum of the concentration of the target gas before the first target time at the first target moment and the first preset concentration. The second target concentration is the sum of the concentration of the target gas before the second target time at the first target moment and the second preset concentration. The first target moment is any moment within the first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0138] 620b, when the concentration of the target gas at the second target moment is greater than or equal to the third target concentration, it is determined that a secondary leakage of the electrolyte occurs.

[0139] The third target concentration is the sum of the concentration of the target gas before the third target time at the second target moment and the third preset concentration. The second target moment is any moment within the second time window. The first preset time window 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.

[0140] The contents of steps 610, 620a and 620b can refer to the relevant descriptions of steps 410, 420a and 420b, and will not be elaborated in this application.

[0141] 620c, when 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 lasts for a third preset time, it is determined that a primary leakage of the electrolyte occurs.

[0142] That is, if the concentration of the target gas is always greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration for a continuous period of time, it is determined that a primary leakage of the electrolyte occurs.

[0143] The fifth preset concentration may be an absolute value or a relative value. Similarly, the sixth preset concentration may be an absolute value or a relative value.

[0144] In some embodiments, the fourth preset concentration in the above step 520b may include the fifth preset concentration, and the second preset time length in the above step 520b may include the third preset time length.

[0145] In the embodiment of the present application, when the concentration of the target gas is always greater than or equal to the fifth preset concentration and less than or equal to the sixth preset concentration within the third preset time period, it can be considered that the electrolyte has a primary leakage. That is, by comparing the relationship between the concentration of the target gas within a period of time and the fifth preset concentration and the sixth preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0146] 620d, when the concentration of the target gas is greater than or equal to the seventh preset concentration and lasts for a fourth preset time period, it is determined that a secondary leakage of the electrolyte occurs.

[0147] The seventh preset concentration is greater than or equal to the sixth preset concentration.

[0148] That is, if the concentration of the target gas is always 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 occurs.

[0149] The seventh preset concentration may be an absolute value or a relative value.

[0150] In the embodiment of the present application, the higher the concentration of the target gas, the higher the level of electrolyte leakage, and the more serious the electrolyte leakage.

[0151] In some embodiments, the fourth preset concentration in the above step 520b may include the seventh preset concentration, and the second preset time length in the above step 520b may include the fourth preset time length.

[0152] In the embodiment of the present application, when the concentration of the target gas is always greater than or equal to the seventh preset concentration within the fourth preset time period, it can be considered that the electrolyte has a secondary leakage. That is, by comparing the relationship between the concentration of the target gas within a period of time and the seventh preset concentration, the error in collecting the concentration of the volatile gas of the electrolyte can be reduced, and the level of electrolyte leakage can be determined more accurately.

[0153] It should be understood that the embodiment of the present application does not limit the durations of the first time window, the second time window, the third preset duration, and the fourth preset duration.

[0154] In some embodiments, when a primary leakage of the electrolyte occurs, step 630a is performed.

[0155] In some embodiments, when a secondary leakage of the electrolyte occurs, step 630b is performed.

[0156] 630a, sending information of the first-level leakage to the fire protection system and / or parameter display device of the battery.

[0157] Fire protection systems for batteries include, for example, fire protection systems for energy storage systems.

[0158] Battery parameter display devices include the monitoring background of the energy storage system, the vehicle's central control screen, etc.

[0159] For example, the fire protection system of the battery can sound an alarm with an interval alarm when receiving information of a first-level leak.

[0160] For another example, when a battery parameter display device receives information about a primary leakage, it can use an intermittent alarm sound as a prompt and display information on its screen that the battery electrolyte has a primary leakage. Personnel can promptly and accurately learn the level of battery leakage from the parameter display device, so as to promptly and effectively perform maintenance and other treatments on the battery.

[0161] In an embodiment of the present application, in the event of a primary leakage of the electrolyte, information about the primary leakage is sent to the fire protection system and / or parameter display device of the battery, so that the fire protection system can respond to the electrolyte leakage in a timely manner, such as by alarm operation, and / or, so that personnel can promptly and accurately learn about the electrolyte leakage from the parameter display device, so that personnel can perform operations such as maintenance on the battery according to the battery leakage situation.

[0162] 630b, sending the information of the secondary leakage to the fire protection system and / or parameter display device of the battery.

[0163] For example, when the fire protection system of the battery receives information about a secondary leak, it can sound an alarm with a continuous alarm and automatically extinguish the fire when a fire occurs.

[0164] For example, when receiving information about secondary leakage, the battery parameter display device can sound a continuous alarm and display information about secondary leakage of the battery electrolyte in red fonts and flashing icons on the screen. Personnel can promptly and accurately learn the level of battery leakage from the parameter display device so as to perform maintenance and other treatments on the battery in a timely and effective manner.

[0165] In an embodiment of the present application, in the event of a secondary leakage of the electrolyte, information about the secondary leakage is sent to the fire protection system and / or parameter display device of the battery, so that the parameter display device can respond to the electrolyte leakage in a timely manner, such as performing a fire extinguishing operation, and / or personnel can promptly and accurately learn about the electrolyte leakage from the parameter display device, so that the personnel can perform operations such as maintaining the battery according to the electrolyte leakage situation.

[0166] In some embodiments, when a secondary leakage of the electrolyte occurs, step 640 and step 650 may be performed.

[0167] 640, obtain battery status information.

[0168] The battery status information includes a power-on state or a power-off state.

[0169] In the present application, when secondary leakage of the electrolyte of the battery occurs, the status information of the battery is obtained.

[0170] 650a, when the battery is powered on, control the battery to be powered off.

[0171] In the event of a secondary leakage of the battery's electrolyte, there is a high possibility of causing fire, explosion and other problems. Therefore, when the battery is powered on, controlling the battery to be powered off can reduce the possibility of electrolyte leakage causing fire, explosion and other problems, and reduce the loss of user's personal and property safety.

[0172] In some embodiments, when the battery is powered on, the battery may be controlled to be powered off after a period of time has passed since it is determined that secondary leakage of the electrolyte of the battery has occurred.

[0173] For example, in the case of secondary leakage of electrolyte, for power-consuming equipment such as electric vehicles, when the battery is powered on, the battery can be controlled to be powered off after a period of time after the electrolyte leakage occurs. In this way, the user can be given time to transfer the vehicle or evacuate personnel.

[0174] 650b, when the battery is in a power-off state, controlling the battery to remain in the power-off state.

[0175] In the event of secondary leakage of the battery electrolyte, there is a high possibility of causing fire, explosion and other problems. Therefore, if the battery is in a power-off state, continue to control the battery in a power-off state to reduce the possibility of fire, explosion and other problems caused by electrolyte leakage, which can reduce the loss of personal and property safety of users.

[0176] In the embodiment of the present application, in the event of a secondary leakage of the battery electrolyte, it is necessary to control the battery to be powered off or remain powered off to reduce the possibility of fire, explosion and other problems caused by electrolyte leakage, and reduce the loss of personal and property safety of users.

[0177] It should be understood that in the present application, the sizes 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.

[0178] In some embodiments, the concentration information of the target gas is collected using a sensor.

[0179] In some embodiments, the sensor is disposed within the housing.

[0180] In some embodiments, the concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is disposed in the box.

[0181] For example, after the NDIR gas sensor collects the concentration information of the target gas in real time, the concentration information can be directly sent to the BMS in real time. Figure 2 The battery monitoring unit shown; the battery monitoring unit then sends the concentration information of the target gas to the BMS in real time.

[0182] In the embodiment of the present application, the NDIR gas sensor has high accuracy and long life. The concentration of volatile gas from the electrolyte collected by the NDIR gas sensor can improve the accuracy of the battery electrolyte leakage detection. At the same time, the NDIR gas sensor can be applied to long-life batteries, which can reduce the disassembly and installation of the battery box and reduce the maintenance of the battery.

[0183] In some embodiments, the power source of the NDIR gas sensor includes one or more of a battery, a power source of a monitoring unit of a battery cell, or a power source of a battery management system of the battery.

[0184] Monitoring units for battery cells, e.g. Figure 2 The battery monitoring unit in the

[0185] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean 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 the present application.

[0186] The above describes in detail the battery leakage detection method of the embodiment of the present application. Figure 7 and Figure 8 The battery leakage detection device of the embodiment of the present application is described in detail, and the technical features described in the method embodiment are applicable to the following device embodiments.

[0187] Figure 7 is a schematic block diagram of a battery leakage detection device provided in an embodiment of the present application. Figure 7 The detection device 4000 includes some or all of the following contents: The detection device 4000 may include an acquisition unit 4010 and a processing unit 4020.

[0188] The battery includes a box body and a battery cell arranged in the box body, and the battery cell includes an electrolyte.

[0189] The acquisition unit 4010 is used to obtain the concentration information of the target gas in the box and the time information of collecting the concentration information, where 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 moment is greater than or equal to the target concentration, where the target concentration is the sum of the concentration of the target gas before the target time at the target moment and the preset concentration, and the target moment is any moment within the first preset time.

[0190] In some embodiments, the processing unit 4020 is used to determine that a primary leakage of the electrolyte occurs when the concentration of the target gas at a first target moment 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 a first target time at the first target moment and a first preset concentration, the second target concentration is the sum of the concentration of the target gas before a second target time at the first target moment and a second preset concentration, the first target moment is any moment within the first time window, the first preset time includes the first time window, and the target concentration includes the first target concentration.

[0191] In some embodiments, the processing unit 4020 is used to determine that a secondary leakage of the electrolyte occurs when the concentration of the target gas at the second target moment is greater than or equal to a third target concentration, the third target concentration being the sum of the concentration of the target gas before a third target time period at the second target moment and a third preset concentration, the second target moment being any moment within the second time window, the first preset time period including the second time window, the target concentration including the third target concentration, and the third preset concentration being greater than or equal to the second preset concentration.

[0192] In some embodiments, the processing unit 4020 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 lasts for a second preset time period.

[0193] In some embodiments, the processing unit 4020 is used to determine that a primary leakage of the electrolyte occurs 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 lasts for a third preset time period.

[0194] In some embodiments, the processing unit 4020 is used to determine that a secondary leakage of the electrolyte occurs when the concentration of the target gas is greater than or equal to a seventh preset concentration and lasts for a fourth preset time period, and the seventh preset concentration is greater than or equal to a sixth preset concentration.

[0195] In some embodiments, the detection device 4000 further includes a sending unit 4030, which is used to send information of the first-level leakage to the fire protection system and / or parameter display device of the battery.

[0196] In some embodiments, the detection device 4000 further includes a sending unit 4030, which is used to send the secondary leakage information to the fire protection system and / or parameter display device of the battery.

[0197] In some embodiments, the acquisition unit 4010 is used to obtain battery status information, where the status information includes a power-on status or a power-off status; the processing unit 4020 is used to control the battery to power off when the battery is in a powered-on status; or, when the battery is in a powered-off status, control the battery to remain in a powered-off status.

[0198] In some embodiments, the concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is disposed in the box.

[0199] In some embodiments, the power source of the NDIR gas sensor includes one or more of a battery, a power source of a monitoring unit of a battery cell, or a power source of a battery management system of the battery.

[0200] For example, a low voltage power supply is provided in a battery cell monitoring unit and a battery management system of the battery.

[0201] It should be understood that the above and other operations and / or functions of each module in the battery leakage detection device 4000 are to achieve Figures 3 to 6 For the sake of brevity, the corresponding processes in each method are not repeated here.

[0202] Figure 8 FIG. 5 is a schematic block diagram of a battery leakage detection device 5000 according to an embodiment of the present application. Figure 8 As shown, 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 the present application based on the instructions.

[0203] The memory 5020 may be a separate device independent of the processor 5010 , or may be integrated into the processor 5010 .

[0204] Alternatively, if Figure 8 As shown, the battery leakage detection device 5000 may further include a transceiver 5030, and the processor 5010 may control the transceiver 5030 to communicate with other devices. Specifically, information or data may be sent to other devices, or information or data sent by other devices may be received.

[0205] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor may be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the detection method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined to perform. The software module may be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0206] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM) or a flash memory. The volatile memory can be a 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 RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0207] Optionally, an embodiment of the present application further provides a battery, which includes the detection device provided in the embodiment of the present application.

[0208] Optionally, an embodiment of the present application further provides an electrical device, which includes a battery and the detection device provided in the embodiment of the present application.

[0209] The electric devices mentioned in the embodiments of the present application may include vehicles, such as battery vehicles, electric vehicles, etc. The electric devices mentioned in the embodiments of the present application may also include other detection devices using batteries, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships, spacecraft or energy storage systems, etc. Spacecraft include, for example, airplanes, rockets, space shuttles and spacecrafts.

[0210] Optionally, an embodiment of the present application further provides an energy storage system, which includes a battery and the detection device provided in the embodiment of the present application.

[0211] An embodiment of the present application also provides a chip, including a processor, which is used to call and run a computer program from a memory.

[0212] Optionally, a device equipped with the chip can execute the corresponding processes implemented by the battery leakage detection device in each method of the embodiments of the present application, which will not be described in detail here for the sake of brevity.

[0213] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0214] Optionally, the computer-readable storage medium can be applied to the battery leakage detection device in the embodiment of the present application, and when the computer program is run on the computer, the computer executes the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0215] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0216] Optionally, the computer program product can be applied to the battery leakage detection device in the embodiments of the present application, and when the computer program instructions are run on a computer, the computer executes the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0217] The embodiment of the present application also provides a computer program.

[0218] Optionally, the computer program can be applied to the battery leakage detection device in the embodiment of the present application. When the computer program is run on a computer, the computer executes the corresponding processes implemented by the battery leakage detection device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0219] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0220] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0221] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the detection device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of the present application can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0222] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0223] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0224] If the functions are implemented in the form of 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 the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0225] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present 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 comprises a box body and a battery cell disposed in the box body, the battery cell comprises an electrolyte, and the method comprises: Acquiring concentration information of a target gas in the box and time information of collecting the concentration information, wherein the target gas is a volatile gas of the electrolyte; When the concentration of the target gas at a target time is greater than or equal to a target concentration, it is determined that the electrolyte has leaked, wherein the target concentration is the sum of the concentration of the target gas before a target time at the target time and a preset concentration, and the target time is any time within a first preset time; When the concentration of the target gas is greater than or equal to the target concentration at the target time, determining that the electrolyte has leaked includes: When the concentration of the target gas at the first target moment 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 primary leakage occurs in the electrolyte, the first target concentration is the sum of the concentration of the target gas before the first target time at the first target moment and a first preset concentration, the second target concentration is the sum of the concentration of the target gas before the second target time at the first target moment and a second preset concentration, the first target moment is any moment 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: When the concentration of the target gas is greater than or equal to the target concentration at the target time, determining that the electrolyte has leaked includes: When the concentration of the target gas at the second target moment is greater than or equal to the third target concentration, it is determined that a secondary leakage of the electrolyte occurs, and the third target concentration is the sum of the concentration of the target gas before the third target time at the second target moment and a third preset concentration, the second target moment is any moment 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.

3. The detection method according to claim 1, characterized in that: The detection method further comprises: When the concentration of the target gas is greater than or equal to a fourth preset concentration and lasts for a second preset time period, it is determined that leakage occurs in the electrolyte.

4. The detection method according to claim 1, characterized in that: The detection method further comprises: When 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 lasts for a third preset time period, it is determined that a primary leakage occurs in the electrolyte.

5. The detection method according to claim 4, characterized in that: The detection method further comprises: When the concentration of the target gas is greater than or equal to a seventh preset concentration and lasts for a fourth preset time period, it is determined that a secondary leakage occurs in the electrolyte, and 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 comprises: The information of the first-level leakage is sent to a fire protection system and / or a parameter display device of the battery.

7. The detection method according to claim 2 or 5, characterized in that: The method further comprises: The information of the secondary leakage is sent to a fire protection system and / or a parameter display device of the battery.

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

9. The detection method according to claim 1, characterized in that: The concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is disposed in the box.

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

11. A battery leakage detection device, characterized in that: The battery comprises a box body and a battery cell disposed in the box body, the battery cell comprises an electrolyte, and the device comprises: An acquisition unit, used for acquiring concentration information of a target gas in the box and time information of acquiring the concentration information, wherein the target gas is a volatile gas of the electrolyte; a processing unit, configured to determine that the electrolyte has leaked 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 at the target time and a preset concentration, and the target time is any time within a first preset time; The processing unit is used to determine that a primary leakage occurs in the electrolyte when the concentration of the target gas at a first target moment is greater than or equal to a first target concentration and less than or equal to a second target concentration, the first target concentration being the sum of the concentration of the target gas before a first target time at the first target moment and a first preset concentration, the second target concentration being the sum of the concentration of the target gas before a second target time at the first target moment and a second preset concentration, the first target moment being any moment within a first time window, the first preset time window including the first time window, and the target concentration including the first target concentration.

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

14. The detection device according to claim 11, characterized in that: The processing unit is used to determine that a primary leakage of the electrolyte occurs 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 lasts for a third preset time.

15. The detection device according to claim 14, characterized in that: The processing unit is used to determine that the electrolyte has a secondary leakage when the concentration of the target gas is greater than or equal to a seventh preset concentration and lasts for a fourth preset time, and 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 also includes: A sending unit is used to send the first-level leakage information to the fire protection system and / or parameter display device of the battery.

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

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

19. The detection device according to claim 11, characterized in that: The concentration information of the target gas is collected by using a non-dispersive infrared (NDIR) gas sensor, and the NDIR gas sensor is arranged in the box.

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

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

22. A battery, characterized in that: The battery comprises a detection device as claimed in any one of claims 11 to 21.

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

Images