WO2024083069A1 - 电池包、用电装置、电池包的检测方法和计算机存储介质 - Google Patents

电池包、用电装置、电池包的检测方法和计算机存储介质 Download PDF

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Publication number
WO2024083069A1
WO2024083069A1 PCT/CN2023/124707 CN2023124707W WO2024083069A1 WO 2024083069 A1 WO2024083069 A1 WO 2024083069A1 CN 2023124707 W CN2023124707 W CN 2023124707W WO 2024083069 A1 WO2024083069 A1 WO 2024083069A1
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WIPO (PCT)
Prior art keywords
battery cell
data
temperature
thermal runaway
module
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PCT/CN2023/124707
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English (en)
French (fr)
Inventor
朱翠翠
张继君
王少飞
魏奕民
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2024083069A1 publication Critical patent/WO2024083069A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of new energy technology, and in particular to a battery pack, an electrical device, a battery pack detection method, and a computer storage medium.
  • batteries are increasingly used in various fields.
  • batteries may experience thermal runaway, which will emit a large amount of heat and harmful gases, causing battery fire or even battery explosion.
  • the embodiments of the present application provide a battery pack, an electrical device, a battery pack detection method and a computer storage medium, aiming to provide a thermal runaway detection solution, thereby helping to improve the safety of electrical devices and personnel, while improving the problem of high thermal runaway detection errors in related technologies and a short service life of temperature sensors.
  • the present application provides a battery pack, which may include:
  • a battery cell module may include at least one battery cell
  • the first acquisition module may include at least one first acquisition unit, the first acquisition unit is disposed in the battery cell, and the first acquisition unit is used to collect first operation data of the battery cell;
  • a data processing module connected to the first acquisition unit, and configured to perform thermal runaway detection on the battery cell according to the first operating data to obtain a first detection result
  • a second acquisition module is arranged outside the battery cell module, and is used to start when the first detection result indicates that any battery cell has a risk of thermal runaway, and collect second operation data of the battery cell after starting;
  • the data processing module is also connected to the second acquisition module and is also used to determine whether the battery cell If there is a risk of thermal runaway, a secondary test is performed to obtain a second test result.
  • a cell module a first acquisition module, a second acquisition module and a data processing module
  • the first acquisition module may include at least one first acquisition unit
  • the data processing module is connected to the first acquisition unit, and is used to perform thermal runaway detection on the cell according to the first operating data to obtain a first detection result.
  • the second acquisition module is connected to the data processing module, and can be started when the first detection result indicates that any cell has a thermal runaway risk, and collects the second operating data of the cell after starting; the data processing module can also perform a secondary detection on whether the cell has a thermal runaway risk through the second operating data to obtain a second detection result.
  • the first acquisition unit is provided in the cell, direct collection of the internal operating data of the cell is realized, which more truly reflects the operating conditions inside the cell, and the second acquisition module outside the cell module is started after confirming the existence of a thermal runaway risk according to the internal operating data of the cell, and then a secondary detection is performed according to the second operating data collected by the second acquisition module, thereby improving the accuracy of thermal runaway early warning detection through secondary detection by combining internal and external detection.
  • the second acquisition module is activated only when the first detection result indicates that there is a risk of thermal runaway.
  • the second acquisition module intermittently collects the second operating data, thereby also improving the service life of the second acquisition module.
  • the battery pack may also include:
  • the thermal management module is connected to the data processing module and is used to balance the temperature of the battery cells when the first detection result indicates that any battery cell has a risk of thermal runaway.
  • the thermal management module performs temperature balance of the battery cells after the first-level warning is generated (i.e., after the first detection result indicates that any battery cell has a risk of thermal runaway).
  • the battery cell temperature reduction operation can be performed in advance, which helps reduce the risk of thermal runaway of the battery cells and improves the safety of battery cell use.
  • the first acquisition unit may include:
  • a first temperature collection unit used to collect first temperature data of the battery cell, and the first operation data may include the first temperature data
  • the data processing module is used to perform thermal runaway detection on the battery cell through the first temperature data, and when the first temperature data meets the temperature runaway condition, indicate the first detection result as the existence of thermal runaway risk of the battery cell.
  • an optional thermal runaway warning scheme of a first temperature acquisition unit built into the battery cell which helps provide a thermal runaway detection scheme with high accuracy and sensitivity, helps to realize battery thermal runaway management as early as possible, improves the accuracy of thermal runaway warning, can buy more time for subsequent thermal management and thermal runaway warning notifications, and improves the technical problem of serious lag in thermal runaway warning in related technologies.
  • the first collection unit may further include a primary collection unit
  • a primary collection unit used for collecting third operation data of the battery cell in addition to the first temperature data, where the first operation data may include the third operation data;
  • the data processing module is used to perform thermal runaway detection on the battery cell through the first temperature data when the third operating data meets the data detection condition of the corresponding type.
  • a second The data detection conditions of the three operating data are determined to eliminate possible abnormalities in the first temperature acquisition unit, improve the accuracy of battery cell thermal runaway detection, and provide a reference for discovering the root cause of battery cell thermal runaway.
  • the battery cell may include a shell and a pole piece accommodated in the shell, and the primary collection unit may include:
  • a pressure collection unit corresponds to the first temperature collection unit, the pressure collection unit is attached to the inner surface of the shell and/or the pole piece, the pressure collection unit is used to collect pressure data of the battery cell, and the third operation data may include pressure data;
  • the third operating data meets the corresponding type of data detection condition.
  • the situation in which excessive pressure inside the battery cell causes the internal temperature of the battery cell to rise, thereby causing a risk of thermal runaway is taken into consideration.
  • a first-level warning of local stress thermal runaway can be achieved with the help of a combination of a built-in pressure acquisition unit and a first temperature acquisition unit. Based on a thermal runaway risk assessment, the root cause of the thermal runaway inside the battery cell is discovered, providing a reference for subsequent analysis and detection of thermal runaway.
  • the data processing module is further used to indicate the first detection result as abnormal stress on the battery cell when the pressure data is greater than a pressure threshold and the first temperature data does not meet the temperature runaway condition.
  • the data processing module analyzes the situation of excessive pressure in the battery cell and confirms that thermal runaway or local stress abnormality is caused by local stress abnormality, thereby achieving accurate abnormality analysis of excessive pressure inside the battery cell.
  • the battery cell may include a bare battery cell, a shell and a top cover, and the bare battery cell is accommodated in a receiving space formed by the shell and the top cover;
  • the primary collection unit may include:
  • a built-in air pressure and gas collection unit is provided between the top cover and the bare battery cell, and is used to collect air pressure data and at least one type of gas concentration in the housing;
  • the third operating data meets the data detection condition of the corresponding type.
  • the data processing module is also used to indicate the first detection result as abnormal gas production of the battery cell when the air pressure data is greater than the air pressure threshold, the first temperature data does not meet the temperature out of control condition and the concentration of any type of gas is greater than the concentration threshold of the corresponding type.
  • thermal runaway or abnormal gas production is caused by gas production, and accurate abnormal analysis of gas production inside the battery cell is achieved, thereby discovering the cause of thermal runaway, which can provide a favorable reference basis for subsequent detection and analysis of thermal runaway of the battery cell.
  • the battery pack may also include:
  • a third acquisition module is used to collect electrical data corresponding to the battery cell, where the electrical data may include at least one of a voltage value and a current value of a circuit where the battery cell is located and an insulation resistance value of the battery cell;
  • the third operation data meets the corresponding type of data detection condition.
  • the data processing module is further used to indicate the first detection result as a cell short circuit abnormality when it is determined based on the electrical data that the third operating data meets the corresponding type of data detection conditions and the first temperature data does not meet the temperature runaway conditions.
  • the electrical data after the electrical data is determined, it is determined whether the first temperature data meets the temperature runaway condition, and it can be determined whether the abnormal short circuit of the battery cell causes the risk of thermal runaway of the battery cell, thereby realizing the accurate abnormal analysis of the short circuit of the battery cell.
  • the electrical data combined with the gas production and the internal pressure of the battery cell, constitute a primary signal acquisition system, thereby triggering the judgment of whether the first temperature data meets the temperature runaway condition, and starting from the various root causes of thermal runaway, it can realize the early warning of thermal runaway risks and discover the causes of thermal runaway in all directions.
  • the second acquisition module may include:
  • a second temperature collection unit is used to start when the first detection result indicates that any battery cell has a risk of thermal runaway, and collect second temperature data of the battery cell after starting, and the second operating data may include the second temperature data;
  • the data processing module is also used to indicate the second detection result as the existence of a secondary thermal runaway risk in the battery cell when the second temperature data is greater than an external temperature threshold.
  • the provision of a second temperature acquisition unit provides an optional implementation method for the data processing module to implement secondary detection of thermal runaway risks based on the second operating data.
  • it can capture the thermal runaway risk signal that overflows from the inside of the battery cell, and timely understand the degree of thermal runaway risk that overflows from the inside of the battery cell.
  • it can also reflect the changes in external signals caused by changes in external conditions such as external high temperature, and can implement early warning of thermal runaway risks caused by external factors.
  • the discontinuous working state of the second temperature acquisition unit can avoid invalid work, greatly improving the actual working life of the second temperature acquisition unit.
  • the second acquisition module may further include:
  • An external air pressure and gas collection unit used to start when the first detection result indicates that any battery cell has a risk of thermal runaway, and collect external air pressure data of the battery cell module and external concentration of at least one type of gas after starting;
  • the data processing module is also used to indicate the second detection result as a second-level warning of gas production abnormality when the external air pressure data is greater than the external air pressure threshold, the concentration of at least one type of external gas is greater than the concentration threshold of the corresponding type, and the second temperature data is less than or equal to the external temperature threshold.
  • the abnormal cause and danger level of the battery pack can be understood in time, and corresponding measures can be taken.
  • the combination of internal and external gas and air pressure collection units and temperature collection units can improve the accuracy of identifying thermal runaway and abnormal gas production of battery packs and prevent misjudgment.
  • the second acquisition module may include:
  • a smoke concentration collection unit configured to start when the first detection result indicates that any battery cell has a risk of thermal runaway, and collect the smoke concentration outside the battery cell module after starting, wherein the second operation data may include the smoke concentration;
  • the second detection result indicates that the battery cell has a secondary thermal runaway risk.
  • This embodiment provides an optional implementation method for the data processing module to realize secondary detection of thermal runaway risk based on the second operating data through the setting of the smoke concentration collection unit.
  • it can capture the thermal runaway risk signal overflowing from the inside of the battery cell, and timely understand the degree of thermal runaway risk overflowing from the inside of the battery cell.
  • it can also reflect the changes in external signals caused by changes in external conditions such as external high temperature and high pressure, and can realize thermal runaway risk warning caused by external factors. It can also detect the phenomenon of smoke generated by the battery pack and remind the people around to deal with it in time.
  • the smoke concentration collection unit can be combined with the second temperature collection unit, and the data collected by any one of the units can be used to confirm that the battery cell has a secondary thermal runaway risk, thereby improving the accuracy of external thermal runaway risk detection. And because the smoke concentration collection unit is only started when the first detection result indicates that any battery cell has a thermal runaway risk, the non-continuous working state of the smoke concentration collection unit can avoid invalid work, greatly improving the actual working life of the smoke concentration collection unit.
  • the present application provides an electrical device, which may include the battery pack of the above aspect.
  • the present application provides a battery pack detection method, which is applied to a data processing module.
  • the battery pack may include a battery cell module, a first acquisition module, and a second acquisition module disposed outside the battery cell module.
  • the battery cell module may include at least one battery cell.
  • the first acquisition module may include at least one first acquisition unit, and the first acquisition unit is disposed in the battery cell.
  • the method may include:
  • a second detection is performed on whether the battery cell has a risk of thermal runaway using the second operating data to obtain a second detection result.
  • the present application also provides a computer storage medium storing a program or instruction, which implements the steps of the battery pack detection method described above when the program or instruction is executed by a processor.
  • the present application also provides a computer storage medium, which, when executed by a processor, performs the steps of the battery pack detection method of the above aspect.
  • the present application also provides a computer program product, which can be processed by a processor The steps are performed to implement the battery pack detection method according to the above aspect.
  • FIG1 is a schematic diagram of the module structure of a battery pack according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG3 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG. 4 is a schematic diagram showing the position of a temperature acquisition unit involved in a battery pack according to an embodiment of the present application.
  • FIG. 5 is another schematic diagram of the position of the temperature acquisition unit involved in the battery pack of the embodiment of the present application.
  • FIG. 6 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG. 7 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG8 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG. 9 is a schematic diagram of the module structure of another embodiment of the battery pack of the embodiment of the present application.
  • FIG. 10 is a schematic diagram of an optional flow chart of a battery pack detection method according to an embodiment of the present application.
  • the figures are as follows: 100. Battery pack; 110, battery cell module; 120, first acquisition module; 130, data processing module; 140, second acquisition module; 111, battery cell; 121, first collection unit; 141, second temperature collection unit; 142, external air pressure and gas collection unit; 143, smoke concentration collection unit; 210.
  • Thermal management module 310. Temperature collection unit; 410, straight portion; 420, bent portion; X, first direction; 610, first-level collection unit; 710.
  • the third acquisition module is as follows: 100. Battery pack; 110, battery cell module; 120, first acquisition module; 130, data processing module; 140, second acquisition module; 111, battery cell; 121, first collection unit; 141, second temperature collection unit; 142, external air pressure and gas collection unit; 143, smoke concentration collection unit; 210.
  • Thermal management module 310. Temperature collection unit; 410, straight portion; 420, bent portion; X, first direction;
  • the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • power batteries can be used as power supplies for electrical equipment (such as vehicles, ships or spacecraft).
  • the main power source while the energy storage battery can be used as a charging source for electrical equipment.
  • the power battery can be the battery in the electrical equipment
  • the energy storage battery can be the battery in the charging equipment.
  • the power battery and the energy storage battery can be collectively referred to as batteries.
  • the related technology When performing early warning of battery thermal runaway, the related technology usually uses temperature sensors arranged in the battery pack to measure the early characteristic parameters of thermal runaway, and then performs battery thermal runaway warning based on the measured characteristic parameters combined with the evidence theory model.
  • the thermal runaway detection error of this scheme is high, and since the temperature sensor continuously measures parameters, the service life of the temperature sensor is also short.
  • the present application provides a battery pack, an electrical device, a battery pack detection method and a computer storage medium for description.
  • the battery pack provided in the embodiment of the present application is first introduced below.
  • the battery pack 100 may include a cell module 110 , a first acquisition module 120 , a data processing module 130 and a second acquisition module 140 .
  • the battery cell module 110 may include at least one battery cell 111 .
  • the first acquisition module 120 may include at least one first acquisition unit 121 .
  • the first acquisition unit 121 may be disposed in the battery cell 111 .
  • the first acquisition unit 121 may be used to acquire first operating data of the battery cell 111 .
  • the data processing module 130 is connected to the first acquisition unit 121 , and the data processing module 130 can be used to perform thermal runaway detection on the battery cell 111 according to the first operating data to obtain a first detection result.
  • the second acquisition module 140 may be disposed outside the battery cell module 110.
  • the second acquisition module 140 may be configured to start when the first detection result indicates that any battery cell 111 has a thermal runaway risk, and collect second operating data of the battery cell 111 after starting.
  • the data processing module 130 may also be connected to the second acquisition module 140 .
  • the data processing module 130 may also be used to perform a secondary detection on whether the battery cell 111 has a thermal runaway risk through the second operating data to obtain a second detection result.
  • the embodiment of the present application is provided with a battery cell module 110, a first acquisition module 120, a second acquisition module 140 and a data processing module 130, wherein the first acquisition module 120 may include at least one first acquisition unit 121; the data processing module 130 may be connected to the first acquisition unit 121, and may be used to perform thermal runaway detection on the battery cells 111 included in the battery cell module 110 according to the first operating data, to obtain a first detection result.
  • the first acquisition module 120 may include at least one first acquisition unit 121
  • the data processing module 130 may be connected to the first acquisition unit 121, and may be used to perform thermal runaway detection on the battery cells 111 included in the battery cell module 110 according to the first operating data, to obtain a first detection result.
  • the second acquisition module 140 is connected to the data processing module 130, and may be started when the first detection result indicates that any battery cell 111 has a thermal runaway risk, and may collect second operating data of the battery cell 111 after starting; the data processing module 130 may also perform a secondary detection on whether the battery cell 111 has a thermal runaway risk through the second operating data, to obtain a second detection result.
  • the second A collection unit 121 is set in the battery cell 111, thereby realizing the direct collection of the internal operating data of the battery cell 111, more realistically reflecting the internal operating conditions of the battery cell 111, and starting the second collection module 140 outside the battery cell module 110 after confirming the existence of thermal runaway risk based on the internal operating data of the battery cell 111, and then performing a secondary test based on the second operating data collected by the second collection module 140, thereby combining the internal and external to improve the accuracy of thermal runaway warning detection through secondary detection.
  • the second collection module 140 is started only when the first detection result indicates the existence of thermal runaway risk, and is in an intermittent collection state, which increases the service life of the second collection module 140.
  • the battery pack 100 may include at least one battery cell 111 and at least one first collection unit 121.
  • the first collection unit 121 may correspond to the battery cell 111 and may be disposed in the corresponding battery cell 111.
  • the battery cell 111 may be a hard shell battery cell, a soft pack battery cell, a laminated battery cell or a cylindrical battery cell.
  • Each first acquisition unit 121 may include a single or multiple acquisition elements, which are all arranged in the battery cell 111.
  • the above-mentioned acquisition element may be a sensor or other acquisition element for obtaining the first operation data.
  • the first acquisition unit 121 may include at least a temperature acquisition unit, and in other examples, may also include a pressure acquisition unit, a gas acquisition unit, and an air pressure acquisition unit, etc. These acquisition elements have strong corrosion resistance, and are therefore suitable for stable settings inside the battery cell 111.
  • the data processing module 130 may be a BMS (Battery Management System) or a chip dedicated to thermal runaway risk warning.
  • the data processing module 130 and the first acquisition unit 121 may be electrically connected via a wire.
  • the first acquisition unit 121 may lead out the acquired signals via independent wires, and subsequently the current first operation data acquired by the first acquisition unit 121 inside the battery cell 111 may be obtained by signal decoupling.
  • the first operating data is related to the type of the first acquisition unit 121.
  • the first operating data may include the first temperature data acquired by the first temperature acquisition unit 310.
  • the first operating data may include the gas concentration acquired by the gas acquisition unit.
  • the data processing module 130 can confirm whether any battery cell 111 in the battery pack 100 meets the thermal runaway detection conditions based on the first operating data combined with the operating conditions of different first operating data.
  • the first detection result can be indicated as the battery pack 100 and/or the battery cell 111 in the battery pack 100 that meets the thermal runaway detection conditions has a thermal runaway risk.
  • the data processing module 130 can issue a first-level thermal runaway warning, and personnel can evacuate in time.
  • the first detection result indicates that the battery pack 100 and all battery cells 111 do not meet the thermal runaway detection conditions.
  • the data processing module 130 can trigger the first acquisition module 120 to continue signal acquisition.
  • the battery pack 100 may further include a second acquisition module 140, which may be disposed outside the battery cell module 110, that is, the second acquisition module 140 may collect operating data (i.e., second operating data) outside the battery cell module 110 in the battery pack 100.
  • the second acquisition module 140 may be started when the first detection result indicates that the battery cell 111 or the battery pack 100 has a risk of thermal runaway, and collect the second operating data outside the battery cell 111 after starting.
  • the second operation data is mainly the environmental data of the battery cell 111 in the battery pack 100.
  • the second operation data may be at least partially the same type as the first operation data.
  • the second operation data and the first operation data may both include temperature data.
  • the second operation data may also include smoke concentration, gas pressure, gas concentration, etc. in the battery pack 100.
  • the second acquisition module 140 collects the second operating data of the battery cell 111 in the battery pack 100
  • the second operating data can be sent to the data processing module 130 electrically connected thereto.
  • the data processing module 130 can perform a secondary detection on whether there is a risk of thermal runaway in the battery cell 111/battery pack 100 based on the second operating data to obtain a second detection result.
  • a secondary thermal runaway warning can be activated at this time.
  • the primary signal acquisition mechanism inside the battery cell 111 and the corresponding thermal runaway warning scheme can promptly respond to the internal problems of the battery cell 111 and be the first to respond to the thermal runaway risk of the battery cell 111.
  • the secondary verification performed by the second acquisition module 140 can, on the one hand, capture the thermal runaway risk signal overflowing from the battery cell 111, and on the other hand, can also respond to external signal changes caused by changes in external conditions such as external mechanical extrusion and high temperature, thereby realizing thermal runaway risk warning caused by external factors.
  • the primary signal acquisition mechanism established by the first acquisition module 120 set inside the battery cell 111, combined with the secondary verification of the second acquisition module 140, can complement and verify the first and second operation data collected inside and outside the battery cell 111, thereby improving the accuracy of the detection and status judgment of the inside and outside of the battery cell 111 and the battery pack 100, and can overcome the misjudgment caused by the early warning judgment of a single signal acquisition module.
  • the second acquisition module 140 is only started when the first detection result indicates that the battery cell 111/battery pack 100 is at risk of thermal runaway. This non-continuous working state can avoid invalid work and greatly improve the actual working life of the second acquisition module 140.
  • the secondary detection can be continued until the first-level thermal runaway warning is lifted.
  • the first-level warning appears, it has been indicated that there is a risk of thermal runaway inside the battery cell 111, but it may not have overflowed to the outside of the battery cell 111.
  • the risk of thermal runaway can be eliminated through cooling measures such as thermal management until the first operating data inside the battery cell 111 returns to normal.
  • the first-level warning can be lifted and the secondary detection can be stopped, thereby continuously detecting whether the risk of thermal runaway inside the battery cell 111 overflows, thereby ensuring the safety of the environment in which the battery pack 100 is located.
  • the battery pack 100 may further include a thermal management module 210, which may be connected to the data processing module 130.
  • the thermal management module 210 may balance the temperature of the battery cell 111 when the first detection result indicates that any battery cell 111 has a risk of thermal runaway.
  • the thermal management module 210 can be adjusted to achieve temperature control so that the temperature inside the battery cell 111 decreases.
  • the first acquisition module 120 inside the battery cell 111 can continue to collect the first operating data to determine the temperature reduction through the thermal management module 210. The plan is to see whether the first-level warning can be lifted.
  • the above-mentioned measures for the thermal management module 210 to balance the temperature of the battery cell 111 can be designed according to actual needs in combination with relevant technologies before the filing date of this case, and will not be elaborated here.
  • the embodiment of this application mainly emphasizes the timing of the thermal management module 210 to balance the temperature of the battery cell 111.
  • the thermal management module 210 performs temperature balance of the battery cell 111 after a first-level warning is generated (i.e., after the first detection result indicates that any battery cell 111 has a risk of thermal runaway).
  • a first-level warning is generated (i.e., after the first detection result indicates that any battery cell 111 has a risk of thermal runaway).
  • the temperature reduction operation of the battery cell 111 can be performed in advance, thereby helping to reduce the risk of thermal runaway of the battery cell 111 and improving the safety of the battery cell 111.
  • the first acquisition unit 121 may include a first temperature acquisition unit 310 .
  • the first temperature acquisition unit 310 may be used to acquire first temperature data of the battery cell 111 , and the first operation data may include the first temperature data.
  • the data processing module 130 can obtain the first temperature data collected by the first temperature collection unit 310 through the electrically connected wire. Then the data processing module 130 can perform thermal runaway detection on the battery cell 111 through the first temperature data. When the first temperature data meets the temperature runaway condition, the data processing module 130 can indicate the first detection result as the risk of thermal runaway of the battery cell 111, and at this time, start the first level thermal runaway warning.
  • the first temperature acquisition unit 310 may be a temperature sensor, or other temperature acquisition equipment for temperature acquisition.
  • the temperature sensor may be one or more of an optical fiber sensor, a bimetallic thermometer, a glass liquid thermometer, a pressure thermometer, a resistance thermometer, a thermistor, and a thermocouple.
  • the first temperature acquisition unit 310 may be attached to the electrode in an array, and the attachment position may be set according to actual needs.
  • the battery cell 111 involved above may include a bare battery cell, which is contained in the accommodation space formed by the top cover and the shell.
  • the bare battery cell may be wound by an isolation film and a pole piece.
  • Figures 3 to 5 where Figures 4 and 5 show the optional distribution position schematic diagram of the first temperature acquisition unit 310 when the pole piece in the battery cell 111 is a winding structure (i.e., the positions marked 1 to 4 in the figure).
  • the pole piece may be an anode pole piece, and the pole piece may be wound around the winding axis to form a winding structure.
  • the pole piece may include a plurality of straight portions 410 and a plurality of bent portions 420, and the plurality of straight portions 410 may be stacked along a first direction X, and the plurality of bent portions 420 may be at least partially bent into an arc shape and connected to two adjacent straight portions 410, and the first direction X is perpendicular to the winding axis.
  • the first temperature acquisition unit 310 may be attached to the straight portion 410 and/or the bent portion 420.
  • the first temperature acquisition unit 310 can be attached to the bent portion 420 of the outermost/innermost electrode inside the battery cell 111, or to the straight portion 410 of the outermost/innermost electrode inside the battery cell 111. Of course, the first temperature acquisition unit 310 can also be attached to the middle electrode.
  • the first temperature data meeting the temperature runaway condition may be that the first temperature data exceeds the temperature threshold, that is, when the first temperature data exceeds the temperature threshold, the first detection result indicates that the battery cell 111 has a thermal runaway risk; conversely, the first temperature data does not exceed the temperature threshold, and the first detection result indicates that the battery cell 111 temporarily does not have a thermal runaway risk.
  • the temperature thresholds of the corresponding positions may be different, thereby taking into account the differences in temperature at various positions inside the battery cell 111 .
  • an optional thermal runaway warning scheme of the built-in first temperature acquisition unit 310 of the battery cell 111 is provided, which helps to provide a thermal runaway detection scheme with high accuracy and sensitivity, helps to realize battery thermal runaway management as early as possible, improves the accuracy of thermal runaway warning, can buy more time for subsequent thermal management and thermal runaway warning notifications, and improves the technical problem of serious lag in thermal runaway warning in related technologies.
  • the first acquisition unit 121 may include a primary acquisition unit 610 in addition to the first temperature acquisition unit 310 .
  • the first-level acquisition unit 610 may be used to acquire third operating data of the battery cell 111 in addition to the first temperature data.
  • the first operating data may also include the third operating data.
  • the data processing module 130 can obtain the third operating data acquired by the first-level acquisition unit 610 through a wire, and then when the third operating data meets the corresponding type of data detection conditions, perform thermal runaway detection on the battery cell 111 through the first temperature data.
  • the main difference between this embodiment and the previous embodiment is that a primary acquisition unit 610 and data detection conditions corresponding to different data types are added.
  • the added primary acquisition unit 610 can be set based on the causes or principles of different thermal runaway phenomena inside the battery cell 111.
  • the first-level acquisition unit 610 can perform gas and air pressure concentration detection to obtain third operating data, so that the data processing module 130 can determine whether the third operating data meets the data detection conditions of the gas and air pressure concentration type.
  • the data detection condition is a detection condition that the third operating data reaches an abnormal phenomenon related to thermal runaway.
  • thermal runaway detection of the battery cell 111 can be achieved through the first temperature data collected by the first temperature collection unit 310.
  • a data detection condition determination of the third operating data can be added to eliminate possible abnormalities in the first temperature acquisition unit 310, thereby improving the accuracy of thermal runaway detection of the battery cell 111 and providing a reference for discovering the root cause of the thermal runaway of the battery cell 111.
  • the above-mentioned first-level collection unit 610 may include a pressure collection unit 710 .
  • the pressure acquisition unit 710 may correspond to the first temperature acquisition unit 310.
  • the pressure acquisition unit 710 may be attached to the straight portion 410 and/or the bent portion 420 shown in FIG. 4 and FIG. 5 , or may be attached to the inner surface of the housing.
  • the pressure acquisition unit 710 may collect pressure data of the battery cell 111, and the third operating data may include the pressure data. When the pressure data is greater than the pressure threshold, the third operating data meets the data detection condition of the corresponding pressure type.
  • the pressure acquisition unit 710 may be a pressure sensor or other acquisition device for acquiring pressure data, wherein the type of the pressure sensor may include at least one of strain gauge piezoresistive, electromagnetic, capacitive, piezoelectric, electrostatic capacitance and vibrating string.
  • the thickness of the pressure collection unit 710 is usually less than 10 ⁇ m. These pressure collection units 710 can be fixed on the electrode by packaging glue. In some embodiments, when the pressure collection unit 710 is attached to the straight portion 410, its effective area can be in the range of 1 cm*1 cm. When the pressure collection unit 710 is attached to the bent portion 420, the effective area of the pressure collection unit 710 can be in the range of 0.5 cm*0.5 cm.
  • the pressure acquisition unit 710 can be arranged next to the first temperature acquisition unit 310. Before the battery cell 111 leaves the factory, the first temperature acquisition unit 310 and the pressure acquisition unit 710 can be uniformly packaged with battery glue to form a temperature and pressure acquisition array, which can be a thin film type with good flexibility, and thus suitable for being arranged at different positions inside the battery cell 111.
  • a pressure collection unit 710 may be provided on the straight portion 410 and/or the bent portion 420 of the innermost/outermost electrode sheet of the battery cell 111, or may be provided at certain positions on the inner surface of the shell of the battery cell 111. In other examples, a pressure collection unit 710 may also be provided on the middle electrode sheet.
  • the straight portion 410 of the innermost electrode sheet of the battery cell 111, the bent portion 420 of the outermost electrode sheet of the battery cell 111 and the inner surface of the shell of the battery cell 111 are all provided with a pressure collection unit 710 for illustration, wherein the pressure data measured on the straight portion 410 of the innermost electrode sheet of the battery cell 111 is the first pressure data P1, the pressure data measured on the bent portion 420 of the outermost electrode sheet of the battery cell 111 is the second pressure data P2, and the pressure data measured on the inner surface of the shell of the battery cell 111 is the third pressure data P3.
  • any pressure data from the first pressure data P1 to the third pressure data P3 is greater than the corresponding pressure threshold, it can be considered that the third operating data meets the data detection conditions of the corresponding pressure data type, and it can be determined whether the first temperature data meets the temperature out of control conditions.
  • the pressure acquisition unit 710 may continue to perform detection.
  • the situation in which excessive pressure inside the battery cell 111 causes the internal temperature of the battery cell 111 to rise, thereby causing a risk of thermal runaway is taken into consideration.
  • a first-level warning of local stress thermal runaway can be achieved with the help of a combination of the built-in pressure acquisition unit 710 and the first temperature acquisition unit 310. Based on a thermal runaway risk assessment, the root cause of the thermal runaway inside the battery cell 111 is discovered, providing a reference for subsequent analysis and detection of thermal runaway.
  • the data processing module 130 can also be used to indicate the first detection result as abnormal stress on the battery cell 111 when the pressure data is greater than the pressure threshold and the first temperature data does not meet the temperature out of control condition.
  • the data processing module 130 can The detection result determines that the local stress on the battery cell 111 is abnormal, and a first-level alarm for the local stress abnormality can be issued.
  • the data processing module 130 analyzes the situation where the battery cell 111 is under excessive pressure, confirms that thermal runaway or local stress abnormality is caused by local stress abnormality, and achieves accurate abnormality analysis of the excessive pressure inside the battery cell 111.
  • the above-mentioned primary collection unit 610 may include a built-in air pressure and gas collection unit 810 .
  • the built-in air pressure and gas collection unit 810 can be arranged between the top cover and the bare battery cell, and the built-in air pressure and gas collection unit 810 can collect air pressure data and at least one type of gas concentration in the shell.
  • the air pressure data is greater than the air pressure threshold, and the concentration of any type of gas is greater than the concentration threshold of the corresponding type, it is confirmed that the third operation data meets the data detection condition of the corresponding type.
  • the built-in air pressure and gas collection unit 810 can be divided into a gas collection unit and an air pressure collection unit.
  • the gas collection unit can include a semiconductor gas sensor that is sensitive to various gases, or the gas collection unit can also be a gas sensor array made by integrating semiconductor gas sensors.
  • the air pressure collection unit can be an air pressure sensor or others, and the type of air pressure sensor can include one or more of strain gauge piezoresistive type, electromagnetic type, capacitive type, piezoelectric type, electrostatic capacitance type, and vibrating string type.
  • the gas sensors may be of various types, and after being integrated into a gas sensor array, they may detect the contents of various different components, while also saving space.
  • the gas sensor may be used to detect gases such as hydrogen, carbon monoxide, and carbon dioxide that may cause the battery cell 111 to fail in gas production, and may also be used to detect organic compounds that are affected by temperature and have high volatility.
  • the volatile organic compounds may include methane, ethylene, and the like.
  • the gas collection unit can detect the gas concentrations of hydrogen, carbon monoxide, carbon dioxide and VOC inside the battery cell 111, and the gas pressure collection unit can collect the gas pressure inside the battery cell 111.
  • the gas pressure collection unit can collect the gas pressure inside the battery cell 111.
  • the gas production inside the battery cell 111 is abnormal. It can be further checked whether the first temperature data is greater than the temperature threshold. When the first temperature data is greater than the temperature threshold, it is determined that there is a risk of thermal runaway inside the battery cell 111 due to abnormal gas production. Otherwise, it is determined that abnormal gas production occurs inside the battery cell 111, and a warning can be issued for the battery cell 111. Level 1 alarm for abnormal internal gas production.
  • gas concentration thresholds of each type can be set according to the actual impact of the gas concentration on thermal runaway, and the gas concentration thresholds of each type can be the same or different.
  • the pressure threshold corresponding to each gas can be used to determine whether the gas production inside the battery cell 111 is abnormal.
  • the above data processing module 130 is also used to indicate the first detection result as abnormal gas production of the battery cell 111 when the air pressure data is greater than the air pressure threshold, the first temperature data does not meet the temperature out of control condition and the concentration of any type of gas is greater than the concentration threshold of the corresponding type.
  • the first temperature data does not meet the temperature runaway condition, it indicates that the thermal runaway risk warning condition caused by abnormal gas production has not been met inside the battery cell 111, but abnormal gas production has occurred. Therefore, it is confirmed that thermal runaway or abnormal gas production is caused by gas production, and accurate abnormal gas production analysis is achieved inside the battery cell 111, thereby discovering the cause of thermal runaway, which can provide a favorable reference for subsequent detection and analysis of thermal runaway of the battery cell 111.
  • This combustible gas detection is the gas that overflows into the battery pack 100.
  • the gas is actually the gas in the battery cell 111 that accumulates to a certain amount and the air pressure reaches the limit and breaks through the explosion-proof valve to overflow. Therefore, the related art has the risk of detection and warning lag, which reduces the time for personnel to escape.
  • the combustible gas detection mainly detects VOC gas.
  • the thermal runaway warning scheme can be made more reliable, the scope of thermal runaway risk warning is improved, and errors are helped to be reduced.
  • the battery pack 100 may further include a third acquisition module 910 .
  • the third acquisition module 910 can be connected to the data processing module 130 , and can be used to collect electrical data of the battery cell 111 , wherein the electrical data includes at least one of the voltage value and current value of the circuit where the battery cell 111 is located and the insulation resistance value of the battery cell 111 .
  • the above electrical data is also included in the third operation data, and whether the electrical type data detection condition is met can be determined based on at least one of the electrical data.
  • the electrical type data detection condition may include that the insulation resistance value is less than the resistance threshold, the current value of the circuit where the battery cell 111 is located is greater than the current threshold, or the rate of decrease of the voltage value of the circuit where the battery cell 111 is located is greater than the rate threshold. That is, if at least one of the insulation resistance value, the rate of decrease of the voltage value, and the current value meets the condition, the third operation data meets the electrical type data detection condition.
  • the risk of thermal runaway caused by electrical reasons of the battery cell 111 is taken into consideration, and the root cause of the thermal runaway inside the battery cell 111 is explored, providing a reference for subsequent analysis and detection of thermal runaway.
  • the data processing module 130 can also be used to indicate the first detection result as a short circuit abnormality of the battery cell 111 when it is determined based on the electrical data that the third operating data meets the corresponding type of data detection conditions and the first temperature data does not meet the temperature out of control conditions.
  • the electrical data is determined, it is determined whether the first temperature data meets the temperature runaway condition, and whether the short circuit abnormality of the battery cell 111 causes the battery cell 111 to have a thermal runaway risk, thereby achieving accurate abnormality analysis of the short circuit of the battery cell 111.
  • a primary signal acquisition system is formed by combining electrical data, gas production, and the internal pressure of the battery cell 111, thereby triggering a judgment on whether the first temperature data meets the temperature runaway conditions.
  • the second acquisition module 140 may include a second temperature acquisition unit 141.
  • the second temperature acquisition unit 141 may be used to start when the first detection result indicates that any battery cell 111 has a risk of thermal runaway, and collect second temperature data of the battery cell 111 after starting, wherein the second operation data may include the second temperature data.
  • the data processing module 130 may also be configured to indicate, when the second temperature data is greater than an external temperature threshold, that the second detection result indicates that the battery cell 111 has a secondary thermal runaway risk.
  • the second temperature acquisition unit 141 can be triggered to start, and the second temperature data can be obtained from the second temperature acquisition unit 141.
  • the second temperature data is greater than the external temperature threshold, it means that there is also a temperature abnormality outside the battery cell module 110 in the battery pack 100, and at this time, the battery cell 111 has a secondary thermal runaway risk.
  • the above-mentioned second temperature acquisition unit 141 can be distributed around the battery cell module 110, and can also be distributed around other components of the battery pack 100 except the battery cell module 110.
  • the second temperature acquisition unit 141 can detect the temperature of the module and the temperature inside the battery pack 100 respectively. When any temperature exceeds the temperature warning value, it indicates that the battery cell 111 has a secondary thermal runaway risk, and the data processing module 130 can issue a secondary thermal runaway warning signal, thereby increasing the thermal runaway risk level. Conversely, when all temperatures collected by the second temperature acquisition unit 141 do not exceed the temperature warning value, it means that the battery cell 111 still has a thermal runaway risk, but there is no spillover risk.
  • the thermal runaway risk signal of the battery cell 111 overflowing from the inside can be captured, and the degree of the thermal runaway risk of the battery cell 111 overflowing from the inside can be understood in time; on the other hand, it can also reflect the changes in external signals caused by changes in external conditions such as external high temperature, and can realize thermal runaway risk warning caused by external factors.
  • This embodiment provides an optional implementation method for the data processing module 130 to perform secondary detection of thermal runaway risk based on the second operating data by setting the second temperature acquisition unit 141. And because the second temperature acquisition unit 141 is only started when the first detection result indicates that any battery cell 111 has a thermal runaway risk, the second temperature acquisition unit 141 is The discontinuous working state of the second temperature collection unit 141 can avoid ineffective work, thereby greatly improving the actual working life of the second temperature collection unit 141.
  • the second acquisition module 140 may include an external air pressure and gas acquisition unit 142 in addition to the second temperature acquisition unit 141 .
  • the external air pressure and gas collection unit 142 can be started when the first detection result indicates that any battery cell 111 has a risk of thermal runaway, and after starting, collects external air pressure data of the battery cell module 110 and at least one type of external gas concentration.
  • the data processing module 130 can also be used to indicate the second detection result as a second-level warning of gas production abnormality when the external air pressure data is greater than the external air pressure threshold, the concentration of at least one type of external gas is greater than the concentration threshold of the corresponding type, and the second temperature data is less than or equal to the external temperature threshold.
  • the specific type and abnormal judgment logic of the external air pressure and gas collection unit 142 can be set with reference to the built-in air pressure and gas collection unit 810 in the battery cell 111, and will not be elaborated here.
  • the data processing module 130 can obtain the second temperature data collected by the second temperature collection unit 141.
  • the second temperature data is greater than the corresponding temperature threshold, a second-level alarm of gas production thermal runaway can be issued to increase the risk level of thermal runaway. Otherwise, a second-level alarm of gas production abnormality is issued to increase the risk level of gas production abnormality.
  • the external air pressure and gas collection unit 142 detects abnormal external gas production, it means that the abnormal gas production has caused the gas to break through the explosion-proof valve of the battery cell module 110 and overflow to the outside of the battery cell 111, which is a dangerous situation.
  • the abnormal cause and degree of danger of the battery pack 100 can be understood in time, and corresponding measures can be taken.
  • the recognition accuracy of thermal runaway and gas production abnormalities of the battery pack 100 can be improved to prevent misjudgment.
  • the second collection module 140 may include a smoke concentration collection unit 143 .
  • the smoke concentration collection unit 143 can be used to start when the first detection result indicates that any battery cell 111 has a risk of thermal runaway, and after starting, collect the smoke concentration outside the battery cell module 110, and the second operation data includes the smoke concentration. Wherein, when the smoke concentration is greater than the smoke concentration warning value, the second detection result indicates that the battery cell 111 has a secondary thermal runaway risk.
  • the smoke concentration collection unit 143 can be distributed around the battery cell module 110 and other locations of the battery pack 100 except the battery cell module 110, and can detect the smoke concentration in the module and the battery pack 100 respectively, and then compare the respective smoke concentrations with the respective smoke concentration warning values. When any smoke concentration exceeds the corresponding smoke concentration warning value, it indicates that there is a secondary thermal runaway risk in the battery cell 111.
  • the data processing module 130 can issue a secondary thermal runaway smoke warning signal for the battery cell 111, increase the risk level of thermal runaway, and inform the surrounding people of the risks of smoke inhalation. On the contrary, when all smoke concentrations collected by the smoke concentration collection unit 143 do not exceed the smoke concentration warning value, the smoke concentration in the battery cell 111 is greater than the smoke concentration warning value.
  • the temperature warning value indicates that the battery cell 111 is still at risk of thermal runaway, but there is no risk of spillover for the time being.
  • the thermal runaway risk signal of the battery cell 111 can be captured, and the degree of thermal runaway risk of the battery cell 111 can be timely understood.
  • it can also reflect the changes in external signals caused by changes in external conditions such as high temperature and high pressure, and can realize the early warning of thermal runaway risks caused by external factors. It can also detect the phenomenon of smoke generated by the battery pack 100, and remind the people around to deal with it in time.
  • This embodiment provides an optional implementation method for the data processing module 130 to realize secondary detection of thermal runaway risk based on the second operating data through the setting of the smoke concentration collection unit 143.
  • the smoke concentration collection unit 143 can be set in combination with the second temperature collection unit 141, and can confirm that the battery cell 111 has a secondary thermal runaway risk based on the data collected by any of the units, thereby improving the accuracy of external thermal runaway risk detection. And because the smoke concentration collection unit 143 is only started when the first detection result indicates that any battery cell 111 has a thermal runaway risk, the non-continuous working state of the smoke concentration collection unit 143 can avoid invalid work, greatly improving the actual working life of the smoke concentration collection unit 143.
  • the battery pack of the embodiment of the present application is described in detail above in conjunction with Figures 1 to 9.
  • the embodiment of the present application also protects an electric device, which includes the battery pack provided by the above embodiment, so that the electric device has all the beneficial effects of the battery pack.
  • the embodiment of the present application further provides a battery pack detection method, which is applied to a data processing module.
  • the battery pack may include a battery cell module, a first acquisition module, and a second acquisition module disposed outside the battery cell module.
  • the battery cell module may include at least one battery cell.
  • the first acquisition module may include at least one first acquisition unit, which is disposed in the battery cell.
  • the method includes:
  • the direct acquisition of the internal operating data of the battery cell is realized, which more truly reflects the operating conditions inside the battery cell
  • the second acquisition module outside the battery cell module is started after confirming the existence of thermal runaway risk based on the internal operating data of the battery cell, and then a secondary detection is performed based on the second operating data collected by the second acquisition module, thereby improving the accuracy of thermal runaway warning detection through secondary detection by combining internal and external detection.
  • it is started only when the first detection result indicates the existence of thermal runaway risk, and is in an intermittent acquisition state, which increases the service life of the second acquisition module.
  • the method further includes:
  • the thermal management module performs temperature balance of the battery cells after the first-level warning is generated (i.e., after the first detection result indicates that any battery cell has a risk of thermal runaway).
  • the battery cell temperature reduction operation can be performed in advance, which helps reduce the risk of thermal runaway of the battery cells and improves the safety of battery cell use.
  • the first acquisition unit includes a first temperature acquisition unit and a first-level acquisition unit.
  • performing thermal runaway detection on the battery cell according to the first operating data to obtain the first detection result may include: acquiring the third operating data collected by the first-level acquisition unit and the first temperature data collected by the first temperature acquisition unit, the first operating data including the third operating data and the first temperature data; when the third operating data meets the data detection conditions of the corresponding type, performing thermal runaway detection on the battery cell through the first temperature data.
  • the third operating data mentioned above can be set with reference to the above.
  • the third operating data such as electrical data, gas production and internal pressure of the battery cell can be combined to form a first-level signal acquisition system, thereby triggering the judgment of whether the first temperature data meets the temperature runaway conditions.
  • the causes of thermal runaway can be discovered in all directions.
  • the present application embodiment can provide a computer storage medium for implementation.
  • the computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the battery pack detection methods in the above embodiments is implemented.
  • an embodiment of the present application also provides a computer program product, including a computer program, which can implement the steps and corresponding contents of the aforementioned method embodiment when executed by a processor.

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Abstract

本申请提供一种电池包、用电装置、电池包的检测方法和计算机存储介质，其中电池包包括：电芯模组，包括至少一个电芯；第一采集模块，包括至少一个第一采集单元，第一采集单元设置于电芯内，第一采集单元，用于采集电芯的第一运行数据；数据处理模块，与第一采集单元连接，用于根据第一运行数据对电芯进行热失控检测，得到第一检测结果；第二采集模块，设置于电芯模组的外部，用于在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯的第二运行数据；数据处理模块，还与第二采集模块连接，还用于通过第二运行数据对电芯是否存在热失控风险进行二次检测，得到第二检测结果。

Description

电池包、用电装置、电池包的检测方法和计算机存储介质
相关申请的交叉引用
本申请要求享有于2022年10月21日提交的名称为“电池包、用电装置、电池包的检测方法和计算机存储介质”的中国专利申请202211292957.9的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及新能源技术领域，尤其涉及一种电池包、用电装置、电池包的检测方法和计算机存储介质。
背景技术
随着新能源技术的发展，电池在各个方面的应用越来越广泛。但受各种诱因影响，电池可能会出现热失控现象，由此将散发出大量热量和有害气体，引起电池着火甚至电池爆炸。
发明内容
本申请实施例提供了一种电池包、用电装置、电池包的检测方法和计算机存储介质，旨在提供一种热失控检测方案，由此帮助提高用电装置和人员安全，同时改善相关技术的热失控检测误差较高，且使得温度传感器的使用寿命较短的问题。
一方面，本申请提供一种电池包，可以包括：
电芯模组，可以包括至少一个电芯；
第一采集模块，可以包括至少一个第一采集单元，第一采集单元设置于电芯内，第一采集单元，用于采集电芯的第一运行数据；
数据处理模块，与第一采集单元连接，用于根据第一运行数据对电芯进行热失控检测，得到第一检测结果；
第二采集模块，设置于电芯模组的外部，用于在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯的第二运行数据；
数据处理模块，还与第二采集模块连接，还用于通过第二运行数据对电芯是否 存在热失控风险进行二次检测，得到第二检测结果。
在这些实施例中，通过设置电芯模组、第一采集模块、第二采集模块和数据处理模块，其中，第一采集模块可以包括至少一个第一采集单元，数据处理模块，与第一采集单元连接，用于根据第一运行数据对电芯进行热失控检测，得到第一检测结果。第二采集模块与数据处理模块连接，能够在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯的第二运行数据；数据处理模块，还能够通过第二运行数据对电芯是否存在热失控风险进行二次检测，得到第二检测结果。而因为第一采集单元设置于电芯内，由此实现了对电芯内部运行数据的直接采集，更为真实地反映了电芯内部的运行工况，且是在根据电芯内部运行数据确认存在热失控风险后再启动电芯模组外部的第二采集模块，进而根据第二采集模块采集的第二运行数据进行二次检测，由此能够内外结合通过二级检测提高热失控预警检测的准确性。此外是在第一检测结果表征存在热失控风险才启动第二采集模块的，第二采集模块为间断采集第二运行数据，因此也提升了第二采集模块的使用寿命。
可选地，电池包还可以包括：
热管理模块，与数据处理模块连接，用于在第一检测结果指示任一电芯存在热失控风险时，平衡电芯的温度。
在这些实施例中，通过热管理模块在一级预警产生后(即第一检测结果指示任一电芯存在热失控风险后)进行电芯温度平衡，相比相关技术能够超前执行电芯温度的降低操作，帮助降低电芯的热失控风险，提升电芯使用安全。
可选地，第一采集单元可以包括：
第一温度采集单元，用于采集电芯的第一温度数据，第一运行数据可以包括第一温度数据；
数据处理模块，用于通过第一温度数据对电芯进行热失控检测，并在第一温度数据符合温度失控条件时，将第一检测结果指示为电芯存在热失控风险。
在这些实施例中，给出了电芯内置第一温度采集单元的可选热失控预警方案，帮助提供了一种准确性、灵敏度高的热失控检测方案，帮助尽早实现了电池热失控管理，提高了热失控预警的准确性，能够为后续热管理和热失控预警通知争取更多时间，改善了相关技术中热失控预警严重滞后的技术问题。
可选地，第一采集单元还可以包括一级采集单元；
一级采集单元，用于采集电芯的除第一温度数据以外的第三运行数据，第一运行数据可以包括第三运行数据；
数据处理模块，用于在第三运行数据符合对应类型的数据检测条件时，通过第一温度数据对电芯进行热失控检测。
在这些实施例中，能够在基于第一温度数据进行电芯热失控检测之前，增加第 三运行数据的数据检测条件判定，排除第一温度采集单元可能出现的异常，提高电芯热失控检测的准确性，同时为发现电芯热失控的根本原因提供了参考依据。
可选地，电芯可以包括壳体和容纳于壳体的极片，一级采集单元可以包括：
压力采集单元，压力采集单元与第一温度采集单元对应，压力采集单元贴合于壳体的内表面和/或极片，压力采集单元用于采集电芯的压力数据，第三运行数据可以包括压力数据；
其中，当压力数据大于压力阈值时，第三运行数据符合对应类型的数据检测条件。
在这些实施例中，考虑了电芯内部压力过大致使电芯内部温度上升，进而出现热失控风险的情况，能够借助内置压力采集单元和第一温度采集单元的组合实现局部受力热失控的一级预警，在进行热失控风险评估的基础上，发现了电芯内部热失控发生的根本原因，为后续热失控的分析和检测提供了参考。
可选地，数据处理模块，还用于在压力数据大于压力阈值且第一温度数据不符合温度失控条件时，将第一检测结果指示为电芯受力异常。
在这些实施例中，由数据处理模块针对电芯压力过大的情况进行了分析，确认是局部受力异常导致的热失控或者局部受力异常，实现了电芯内部压力过大的精准异常分析。
可选地，电芯可以包括裸电芯、壳体和顶盖，裸电芯收容于壳体和顶盖围合形成的容纳空间内；一级采集单元可以包括：
内置气压和气体采集单元，设置于顶盖和裸电芯之间，用于采集壳体内的气压数据和至少一种类型的气体浓度；
其中，当气压数据大于气压阈值，且任一种类型的气体浓度大于对应类型的浓度阈值时，第三运行数据符合对应类型的数据检测条件。
在这些实施例中，通过在电芯内部内置内置气压和气体采集单元能够很好地侦测电芯内部是否发生大量产气现象，进而结合第一温度数据变化，实现产气异常引起的电芯热失控的准确判定。
可选地，数据处理模块，还用于在当气压数据大于气压阈值，第一温度数据不符合温度失控条件且任一种类型的气体浓度大于对应类型的浓度阈值时，将第一检测结果指示为电芯产气异常。
在这些实施例中，能够确认是产气造成的热失控或者产气异常，实现了电芯内部产气的精准异常分析，由此发现了热失控的产生原因，能够为后续电芯热失控的检测和分析提供有利参考依据。
可选地，电池包还可以包括：
第三采集模块，用于采集电芯对应的电学数据，电学数据可以包括电芯所在回路的电压值、电流值以及电芯的绝缘电阻值中的至少一项；
其中，当绝缘电阻值小于电阻阈值，电流值大于电流阈值，或者电压值的下降速率大于速率阈值时，第三运行数据符合对应类型的数据检测条件。
在这些实施例中，考虑了电芯电学原因所导致的热失控风险，探索得到了电芯内部热失控发生的根本原因，为后续热失控的分析和检测提供了参考。
可选地，数据处理模块，还用于当根据电学数据确定第三运行数据符合对应类型的数据检测条件且第一温度数据不符合温度失控条件时，将第一检测结果指示为电芯短路异常。
在这些实施例中，在电学数据判定后，确定第一温度数据是否符合温度失控条件，能够确定电芯短路异常是否导致电芯存在热失控风险，实现了电芯短路的精准异常分析。且电学数据结合产气以及电芯内部压力构成了一级信号采集系统，由此触发第一温度数据是否符合温度失控条件的判断，能够从热失控产生的各项根本原因出发，在实现热失控风险预警的同时，全方位发现热失控产生的诱因。
可选地，第二采集模块可以包括：
第二温度采集单元，用于在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯的第二温度数据，第二运行数据可以包括第二温度数据；
数据处理模块，还用于在第二温度数据大于外部温度阈值时，将第二检测结果指示为电芯存在二级热失控风险。
在这些实施例中，通过第二温度采集单元的设置，为数据处理模块依据第二运行数据实现热失控风险的二次检测提供了可选实现方式。一方面能够捕获电芯内部外溢出的热失控风险信号，及时了解了电芯内部外溢出的热失控风险程度，另一方面也可反应由外部高温等外部条件改变引起的外部信号变化，能够实现由于外部因素造成的热失控风险预警。且由于第二温度采集单元是在第一检测结果指示任一电芯存在热失控风险时才启动，因此第二温度采集单元的非连续工作状态可避免无效工作，大大提高了第二温度采集单元的实际工作寿命。
可选地，第二采集模块还可以包括：
外置气压和气体采集单元，用于在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯模组的外部气压数据和外部的至少一种类型的气体浓度；
数据处理模块，还用于在外部气压数据大于外部气压阈值，外部的至少一种类型的气体浓度大于对应类型的浓度阈值，且第二温度数据小于或等于外部温度阈值时，将第二检测结果指示为产气异常二级预警。
在这些实施例中，能够及时了解电池包的异常原因以及危险程度，并对应采取 措施。此外，通过内外部的气体和气压采集单元以及温度采集单元的结合设置，能够提高电池包热失控和产气异常的识别精确度，防止误判。
可选地，第二采集模块可以包括：
烟雾浓度采集单元，用于在第一检测结果指示任一电芯存在热失控风险时启动，并在启动后采集电芯模组外部的烟雾浓度，第二运行数据可以包括烟雾浓度；
其中，在烟雾浓度大于烟雾浓度预警值时，第二检测结果指示电芯存在二级热失控风险。
本实施例通过烟雾浓度采集单元的设置，为数据处理模块依据第二运行数据实现热失控风险的二次检测提供了可选实现方式。一方面能够捕获电芯内部外溢出的热失控风险信号，及时了解了电芯内部外溢出的热失控风险程度，另一方面也可反应由外部高温、高压等外部条件改变引起的外部信号变化，能够实现由于外部因素造成的热失控风险预警。还能够发现电池包产生烟雾的现象，提醒周围人群及时做出处理。
此外，该烟雾浓度采集单元可以和第二温度采集单元结合设置，可以依据其中任一单元采集的数据确认电芯存在二级热失控风险，提高了外部热失控风险检测的准确性。且由于烟雾浓度采集单元是在第一检测结果指示任一电芯存在热失控风险时才启动，因此烟雾浓度采集单元的非连续工作状态可避免无效工作，大大提高了烟雾浓度采集单元的实际工作寿命。
另一方面，本申请提供一种用电装置，用电装置可以包括上述方面的电池包。
又一方面，本申请提供一种电池包的检测方法，应用于数据处理模块，电池包可以包括电芯模组、第一采集模块和设置在电芯模组外部的第二采集模块，电芯模组可以包括至少一个电芯，第一采集模块可以包括至少一个第一采集单元，第一采集单元设置在电芯内，方法可以包括：
获取第一采集模块采集的电芯的第一运行数据；
根据第一运行数据对电芯进行热失控检测，得到第一检测结果；
在第一检测结果指示任一电芯存在热失控风险时，控制第二采集模块启动，并获取第二采集模块采集的电芯外部的第二运行数据；
通过第二运行数据对电芯是否存在热失控风险进行二次检测，得到第二检测结果。
再一方面，本申请还提供一种计算机存储介质，该计算机存储介质上存储程序或指令，程序或指令被处理器执行时实现上述方面的电池包的检测方法的步骤。
再一方面，本申请还提供一种计算机存储介质，计算机存储介质被处理器执行时，执行上述方面的电池包的检测方法的步骤。
再一方面，本申请还提供一种计算机程序产品，该计算机程序产品可被处理器 执行以实现如上述方面的电池包的检测方法的步骤。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请实施例的电池包一实施例的模块结构示意图。
图2为本申请实施例的电池包另一实施例的模块结构示意图。
图3为本申请实施例的电池包又一实施例的模块结构示意图。
图4为本申请实施例的电池包所涉及的温度采集单元的一位置示意图。
图5为本申请实施例的电池包所涉及的温度采集单元的另一位置示意图。
图6为本申请实施例的电池包再一实施例的模块结构示意图。
图7为本申请实施例的电池包再一实施例的模块结构示意图。
图8为本申请实施例的电池包再一实施例的模块结构示意图。
图9为本申请实施例的电池包再一实施例的模块结构示意图。
图10为本申请实施例的电池包的检测方法的可选流程示意图。
附图标号如下：
100、电池包；
110、电芯模组；120、第一采集模块；130、数据处理模块；140、第二采集模
块；
111、电芯；121、第一采集单元；141、第二温度采集单元；142、外置气压和
气体采集单元；143、烟雾浓度采集单元；
210、热管理模块；
310、温度采集单元；
410、平直部；420，弯折部；X，第一方向；
610、一级采集单元；
710、压力采集单元；
810、内置气压和气体采集单元；
910、第三采集模块。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在新能源领域中，动力电池可作为用电设备(例如车辆、船舶或航天器等)的 主要动力源，而储能电池可作为用电设备的充电来源，二者的重要性均不言而喻。作为示例而非限定，在一些应用场景中，动力电池可为用电设备中的电池，储能电池可为充电设备中的电池。为了便于描述，在下文中，动力电池和储能电池均可统称为电池。
随着新能源技术的发展，动力电池的需求和动力电池内部的能量密度并行提升。而在今后很长一段时间里，随着电池能量密度的日益提高，热失控风险都将呈现上升趋势。
相关技术在进行电池热失控早期预警时，通常是利用电池包内布置的温度传感器等进行热失控早期特征参量的测量，进而依据测量得到的特征参量结合证据理论模型进行电池热失控预警，但这种方案的热失控检测误差较高，且由于温度传感器持续进行参量的测量，因此也使得温度传感器的使用寿命较短。
为了解决上述技术问题，本申请提供了一种电池包、用电装置、电池包的检测方法和计算机存储介质进行说明，下面首先对本申请实施例提供的电池包进行介绍。
参看图1，图1示出了本申请实施例的电池包100一可选实施例的模块结构示意图。在本实施例中，该电池包100可以包括电芯模组110、第一采集模块120、数据处理模块130和第二采集模块140。
电芯模组110，可以包括至少一个电芯111。
第一采集模块120，可以包括至少一个第一采集单元121，第一采集单元121可以设置于电芯111内，第一采集单元121可以用于采集电芯111的第一运行数据。
数据处理模块130与第一采集单元121连接，数据处理模块130可以用于根据第一运行数据对电芯111进行热失控检测，得到第一检测结果。
第二采集模块140，可以设置于电芯模组110的外部。第二采集模块140可以用于在第一检测结果指示任一电芯111存在热失控风险时启动，并在启动后采集电芯111的第二运行数据。
数据处理模块130，还可以与第二采集模块140连接，数据处理模块130还可以用于通过第二运行数据对电芯111是否存在热失控风险进行二次检测，得到第二检测结果。
本申请实施例通过设置电芯模组110、第一采集模块120、第二采集模块140和数据处理模块130，其中，第一采集模块120可以包括至少一个第一采集单元121；数据处理模块130，可以与第一采集单元121连接，可以用于根据第一运行数据对电芯模组110包括的电芯111进行热失控检测，得到第一检测结果。第二采集模块140与数据处理模块130连接，能够在第一检测结果指示任一电芯111存在热失控风险时启动，并在启动后采集电芯111的第二运行数据；数据处理模块130，还能够通过第二运行数据对电芯111是否存在热失控风险进行二次检测，得到第二检测结果。而因为第 一采集单元121设置于电芯111内，由此实现了对电芯111内部运行数据的直接采集，更为真实地反映了电芯111内部的运行工况，且是在根据电芯111内部运行数据确认存在热失控风险后再启动电芯模组110外部的第二采集模块140，进而根据第二采集模块140采集的第二运行数据进行二次检测，由此能够内外结合通过二级检测提高热失控预警检测的准确性。此外第二采集模块140是在第一检测结果表征存在热失控风险才启动的，处于间断采集状态，提升了第二采集模块140的使用寿命。
上述电池包100可以包括至少一个电芯111和至少一个第一采集单元121，第一采集单元121可以与电芯111对应，第一采集单元121可以设置于对应的电芯111内。其中上述电芯111可以是硬壳电芯、软包电芯、叠片式或者圆柱电芯。
每个第一采集单元121可以包括单个或多个采集元件，这些采集元件均设于电芯111内。上述采集元件可以是传感器或者用于获取第一运行数据的其他采集元件。示例性地，第一采集单元121可以至少包括温度采集单元，在其他示例中，还可以包括压力采集单元、气体采集单元以及气压采集单元等等。这些采集元件具有较强的抗腐蚀性能，由此适用于电芯111内部的稳定设置。
上述数据处理模块130可以是BMS(Battery Management System，电池管理系统)，还可以是专用于进行热失控风险预警的芯片。数据处理模块130和第一采集单元121可以通过导线电连接。示例性地，在第一采集单元121实现信号采集后，第一采集单元121可以通过各自独立的导线引出该采集的信号，后续可以通过信号解耦得到电芯111内部的第一采集单元121采集的当前第一运行数据。
上述第一运行数据与第一采集单元121的类型相关，示例性地，当第一采集单元121包括第一温度采集单元310，第一运行数据可以包括第一温度采集单元310采集的第一温度数据。当第一采集单元121包括气体采集单元，第一运行数据可以包括气体采集单元采集的气体浓度。
在进行热失控预警时，数据处理模块130可以根据第一运行数据结合不同第一运行数据的运行条件确认电池包100中任一电芯111是否符合热失控检测条件，在任一电芯111符合热失控检测条件时，可以将第一检测结果指示为电池包100和/或电池包100中符合热失控检测条件的电芯111存在热失控风险，此时数据处理模块130可以发出热失控一级预警，人员可以及时撤离。反之，当所有电芯111均不符合热失控检测条件时，该第一检测结果指示为电池包100以及所有电芯111均不符合热失控检测条件，此时数据处理模块130可以触发第一采集模块120继续进行信号采集。
其中，电池包100还可以包括第二采集模块140，该第二采集模块140可以设置于电芯模组110的外部，即第二采集模块140可以采集电池包100内的电芯模组110外部的运行数据(即第二运行数据)。该第二采集模块140可以在第一检测结果指示电芯111或电池包100存在热失控风险时启动，并在启动后采集电芯111外部的第二运行数据。
该第二运行数据主要为电芯111在电池包100内的环境数据，该第二运行数据可以与第一运行数据的类型至少部分相同，例如第二运行数据和第一运行数据均可以包括温度数据。除此之外，第二运行数据还可以包括电池包100内的烟雾浓度、气体压力以及气体浓度等等。
在第二采集模块140采集电池包100内电芯111的第二运行数据后，可以将该第二运行数据发送给与其电连接的数据处理模块130，该数据处理模块130可以依据第二运行数据对电芯111/电池包100是否存在热失控风险进行二次检测，得到第二检测结果。
其中，当数据处理模块130经过二次检测，并依据第二检测结果确定电芯111/电池包100存在热失控风险时，此时可以启动二级热失控预警。
需要说明的是，电芯111内部一级信号采集机制和相应的热失控预警方案能够及时反应电芯111内部问题，最先响应电芯111热失控风险，而由第二采集模块140进行的二次验证，一方面能够捕获电芯111内部外溢出的热失控风险信号，另一方面也可反应由外部机械挤压，高温等外部条件改变引起的外部信号变化，能够实现由于外部因素造成的热失控风险预警。
在这些实施例中，通过设置在电芯111内部的第一采集模块120建立的一级信号采集机制，结合第二采集模块140的二次验证，能够将内外采集的第一运行数据和第二运行数据进行相互补充与验证，提高了电芯111内外部、电池包100的检测与状态判定的准确度，能够克服单一信号采集模块进行预警判断而造成的误判。此外，第二采集模块140仅在第一检测结果指示电芯111/电池包100存在热失控风险时才启动，这种非连续的工作状态可避免无效工作，大大提高第二采集模块140的实际工作寿命。
在一些实施例中，当利用第二运行数据进行热失控风险的二次检测时，若检测结果正常，可以继续进行该二次检测直至热失控一级预警解除时为止。需要说明的是，当一级预警出现时已经表征电芯111内部存在热失控风险，但可能未外溢到电芯111外部，此时可以通过热管理等降温措施消除热失控风险，直至电芯111内部的各项第一运行数据恢复正常，可以解除一级预警并停止二次检测，由此能够持续检测电芯111内部热失控风险是否外溢，保证电池包100所在环境的安全。
请参看图2，基于上述实施例提出本申请的另一实施例，在该实施例中，电池包100还可以包括热管理模块210，该热管理模块210可以与数据处理模块130连接。热管理模块210可以在第一检测结果指示任一电芯111存在热失控风险时，平衡电芯111的温度。
在得到第一检测结果指示任一电芯111存在热失控风险时，可以调节热管理模块210，进而实现温度管控，使得电芯111内部的温度下降。同时电芯111内部的第一采集模块120可以继续进行第一运行数据的采集，以确定通过热管理模块210的降温 方案，是否能够解除一级预警。
上述热管理模块210平衡电芯111的温度的措施可以根据实际需要结合本案申请日以前的相关技术进行设计，在此不过多赘述。本申请实施例主要强调的是热管理模块210平衡电芯111温度的时机。
在这些实施例中，通过热管理模块210在一级预警产生后(即第一检测结果指示任一电芯111存在热失控风险后)进行电芯111温度平衡，相比相关技术能够超前执行电芯111温度的降低操作，帮助降低电芯111的热失控风险，提升电芯111使用安全。
请参看图3，基于上述实施例提出本申请的又一实施例，在该实施例中，第一采集单元121可以包括第一温度采集单元310。
上述第一温度采集单元310可以用于采集电芯111的第一温度数据，第一运行数据可以包括第一温度数据。
数据处理模块130可以通过电连接的导线获得第一温度采集单元310采集的第一温度数据。接着数据处理模块130可以通过第一温度数据对电芯111进行热失控检测。在第一温度数据符合温度失控条件时，数据处理模块130可以将第一检测结果指示为电芯111存在热失控风险，此时启动热失控一级预警。
上述第一温度采集单元310可以为温度传感器，或者是用于温度采集的其他温度采集设备。上述温度传感器的类型可以为光纤传感器，双金属温度计、玻璃液体温度计、压力式温度计、电阻温度计、热敏电阻和温差电偶等一种或多种。上述第一温度采集单元310可以阵列式地贴合于极片上，其贴合位置可以根据实际需要设置。
需要说明的是，上述涉及的电芯111可以包括裸电芯，该裸电芯又容置于顶盖和壳体组成的容纳空间内。该裸电芯可以由隔离膜和极片卷绕而成。示例性地，请一并参看图3至图5，其中图4和图5示出了电芯111内的极片为卷绕结构时，第一温度采集单元310的可选分布位置示意图(即图中①至④标示位置)。该极片可以为阳极极片，极片可以绕卷绕轴线卷绕形成卷绕结构，极片可以包括多个平直部410和多个弯折部420，多个平直部410可以沿第一方向X层叠设置，多个弯折部420至少部分弯折为弧形并连接相邻的两个平直部410，第一方向X与卷绕轴线垂直。第一温度采集单元310可以贴合于平直部410和/或弯折部420。
上述第一温度采集单元310可以贴合在电芯111内部的最外层/最内层极片的弯折部420，还可以贴合在电芯111内部的最外层/最内层极片的平直部410。当然，第一温度采集单元310也可以贴合在中间极片。
第一温度数据符合温度失控条件可以是第一温度数据超过温度阈值，即第一温度数据超过温度阈值时，第一检测结果指示电芯111存在热失控风险；反之，第一温度数据未超过温度阈值，第一检测结果则指示电芯111暂时不存在热失控风险。
还需要说明的是，当第一温度采集单元310设置于多个位置时，对应位置的温度阈值可以不同，由此考虑了电芯111内部各个位置温度的差异性。
在这些实施例中，给出了电芯111内置第一温度采集单元310的可选热失控预警方案，帮助提供了一种准确性、灵敏度高的热失控检测方案，帮助尽早实现了电池热失控管理，提高了热失控预警的准确性，能够为后续热管理和热失控预警通知争取更多时间，改善了相关技术中热失控预警严重滞后的技术问题。
请参看图6，基于上述实施例提出本申请的再一实施例，在该实施例中，第一采集单元121除包括第一温度采集单元310以外，还可以包括一级采集单元610。
上述一级采集单元610，可以用于采集电芯111的除第一温度数据以外的第三运行数据，第一运行数据对应还可以包括第三运行数据。
在一级采集单元610采集得到电芯111的第三运行数据之后，数据处理模块130可以通过导线获得一级采集单元610采集的第三运行数据，进而在第三运行数据符合对应类型的数据检测条件时，通过第一温度数据对电芯111进行热失控检测。
本实施例与前述实施例的主要区别在于增加了一级采集单元610以及不同数据类型所对应的数据检测条件，该增加的一级采集单元610可以基于电芯111内部出现不同热失控现象的诱因或原理进行设置。
例如热失控风险可能由于电芯111内部产生的气体浓度过高引起，则一级采集单元610可以进行气体和气压浓度检测，进而得到第三运行数据，使得数据处理模块130可以判定第三运行数据是否符合气体和气压浓度类型的数据检测条件。
该数据检测条件是第三运行数据达到热失控相关的异常现象的检测条件，在第三运行数据符合对应类型的数据检测条件时，可以通过第一温度采集单元310采集的第一温度数据实现电芯111的热失控检测。
在这些实施例中，能够在基于第一温度数据进行电芯111热失控检测之前，增加第三运行数据的数据检测条件判定，排除第一温度采集单元310可能出现的异常，提高电芯111热失控检测的准确性，同时为发现电芯111热失控的根本原因提供了参考依据。
请参看图7并请一并参看图4至图5，基于上述实施例，提出本申请电池包100的再一实施例，在该实施例中，上述一级采集单元610可以包括压力采集单元710。
该压力采集单元710可以与第一温度采集单元310对应，压力采集单元710可以贴合于图4和图5所示出的平直部410和/或弯折部420，还可以贴合在壳体的内表面。压力采集单元710可以采集电芯111的压力数据，上述第三运行数据包括上述压力数据。其中，压力数据大于压力阈值时，第三运行数据符合对应压力类型的数据检测条件。
上述压力采集单元710可以是压力传感器或者用于获取压力数据的其他采集设备，其中压力传感器的类型可以包括应变片压阻型、电磁型、电容式、压电型、静电容量型以及振弦式中的至少一种。
上述压力采集单元710的厚度通常小于10μm，这些压力采集单元710可以通过封装胶封装固定在极片上，在一些实施例中，当压力采集单元710贴合于平直部410时，其有效面积可以在1cm*1cm范围内，当压力采集单元710贴合于弯折部420时，压力采集单元710的有效面积可以在0.5cm*0.5cm范围内。
在一些示例中，该压力采集单元710可以设置在第一温度采集单元310旁。在电芯111出厂前，可以统一用电池胶水将第一温度采集单元310和压力采集单元710封装形成温度压力采集阵列，该阵列可以为薄膜型，具有良好的柔韧性，由此适用于电芯111内部不同位置的设置。
请继续参看图7，并请一并参看图4，可以在电芯111的最内层/最外层极片的平直部410和/或弯折部420设置压力采集单元710，还可以在电芯111壳体的内表面某些位置设置压力采集单元710。在其他示例中，也可以在中间极片上设置压力采集单元710。
以电芯111最内层极片的平直部410，电芯111最外层极片的弯折部420以及电芯111壳体内表面均设置有压力采集单元710进行说明，其中电芯111最内层极片的平直部410测得的压力数据为第一压力数据P1，电芯111最外层极片的弯折部420测得的压力数据为第二压力数据P2，电芯111壳体内表面测得的压力数据为第三压力数据P3。
当第一压力数据P1至第三压力数据P3中任意压力数据大于对应的压力阈值时，可以认为第三运行数据符合对应压力数据类型的数据检测条件，可以判定第一温度数据是否符合温度失控条件。
当第一压力数据P1至第三压力数据P3中所有压力数据均不大于对应的压力阈值时，则可以由压力采集单元710继续进行检测。
在这些实施例中，考虑了电芯111内部压力过大致使电芯111内部温度上升，进而出现热失控风险的情况，能够借助内置压力采集单元710和第一温度采集单元310的组合实现局部受力热失控的一级预警，在进行热失控风险评估的基础上，发现了电芯111内部热失控发生的根本原因，为后续热失控的分析和检测提供了参考。
请继续参看图7，基于上述实施例，提出本申请电池包100的再一实施例，在该实施例中，数据处理模块130，还可以用于在压力数据大于压力阈值且第一温度数据不符合温度失控条件时，将第一检测结果指示为电芯111受力异常。
需要说明的是，当电芯111内部某个位置的压力数据大于对应位置的压力阈值时，此时表征电芯111内部局部发生受力异常，但该受力异常现象并未导致电芯111内部的温度上升，因此不存在由此导致的热失控风险，数据处理模块130可以将第一 检测结果认定为电芯111局部受力异常，可以进行局部受力异常的一级警报。
在这些实施例中，由数据处理模块130针对电芯111压力过大的情况进行了分析，确认是局部受力异常导致的热失控或者局部受力异常，实现了电芯111内部压力过大的精准异常分析。
请参看图8，基于上述实施例，提出本申请的电池包100的再一实施例，在该实施例中，上述一级采集单元610可以包括内置气压和气体采集单元810。
该内置气压和气体采集单元810可以设置在顶盖和裸电芯之间，内置气压和气体采集单元810可以采集壳体内的气压数据和至少一种类型的气体浓度。其中，气压数据大于气压阈值，且任一类型的气体浓度大于对应类型的浓度阈值时，确认第三运行数据符合对应类型的数据检测条件。
需要说明的是，当电芯111内部温度升高时，电解液和活性材料将迅速发生副反应，产生大量易爆气体(如氢气、一氧化碳)、易挥发性有机化合物(Volatile Organic Compounds，VOC)以及二氧化碳，且此时气体压力也会迅速提高，由此容易引起热失控现象。通过在电芯111内部设置内置气压和气体采集单元810能够很好地侦测电芯111内部是否发生大量产气现象，进而结合第一温度数据变化，实现产气异常引起的电芯111热失控的准确判定。
该内置气压和气体采集单元810可以分为气体采集单元和气压采集单元。其中，气体采集单元可以包括对各类气体敏感的半导体性气体传感器，或者气体采集单元也可以是半导体性气体传感器集成制作的气体传感器阵列。气压采集单元可以是气压传感器或者其它，气压传感器的类型可以包括应变片压阻型、电磁型、电容式、压电型、静电容量型、振弦式中的一种或多种。
上述气体传感器的类型可以包括多种，在集成为气体传感器阵列后可以实现多种不同成分含量的检测，同时还节约了空间。气体传感器可以用于检测氢气、一氧化碳、二氧化碳等使得电芯111产气失效的气体，还可以用于检测受温度影响，具有较大的易挥发性有机化合物，示例性地，上述挥发性有机化合物可以包括甲烷、乙烯等。
示例性地，上述气体采集单元能够检测电芯111内部的氢气、一氧化碳、二氧化碳以及VOC的气体浓度，同时气压采集单元可以采集电芯111内部的气体压力。当电芯111内部总的气体压力未大于气压阈值，或者所有类型的气体浓度均小于或等于对应类型的气体浓度阈值时，此时电芯111内部产气正常，可以继续进行气体压力和气体浓度的检测。
当电芯111内部总的气体压力大于气压阈值，且任一类型的气体浓度大于对应类型的气体浓度阈值时，此时认定电芯111内部产气异常。可以进一步查看第一温度数据是否大于温度阈值，在第一温度数据大于温度阈值时，认定由于产气异常电芯111内部存在热失控风险，而反之，则认定电芯111内部发生产气异常，可以发出电芯111 内部产气异常的一级警报。
还需要说明的是，上述各个类型的气体浓度阈值可以根据实际该气体浓度对热失控的影响进行设定，各个类型的气体浓度阈值可以相同，也可以不同。
在另一些实施例中，也可以通过气体浓度和总的气体压力，求得每种气体的压力Pi＝P*yi，其中P为电芯111内部的气体压力，y为i类型的气体浓度，并结合每种气体对应的压力阈值进行电芯111内部产气是否异常的判定。
请继续参看图8，基于上述实施例提出本申请电池包100的再一实施例，在该实施例中，上述数据处理模块130，还用于在当气压数据大于气压阈值，第一温度数据不符合温度失控条件且任一种类型的气体浓度大于对应类型的浓度阈值时，将第一检测结果指示为电芯111产气异常。
其中，若第一温度数据不符合温度失控条件，则表明此时电芯111内部并未达到产气异常所导致的热失控风险预警的条件，但出现了产气异常。因此确认是产气造成的热失控或者产气异常，实现了电芯111内部产气的精准异常分析，由此发现了热失控的产生原因，能够为后续电芯111热失控的检测和分析提供有利参考依据。
需要说明的是，相关技术存在可燃性气体检测方案，这种可燃性气体检测的是外溢到电池包100的气体，该气体实际是电芯111内气体积累到一定量，气压达到极限冲破防爆阀所外溢出的，因此相关技术存在检测与预警滞后，减少人员逃生处置时间的风险。且可燃性气体检测主要检测的是VOC气体。因此相比相关技术，在这些实施例中，通过将内置气压和气体采集单元810设置在电芯111内部，并可检测一氧化碳、二氧化碳、甲烷等多种类型的气体浓度，能够使得热失控预警方案具有更高可靠性，提升了热失控风险预警的范围，帮助减少误差。
请参看图9，基于上述实施例，提出本申请的电池包100的再一实施例，在该实施例中，该电池包100还可以包括第三采集模块910。
该第三采集模块910可以与数据处理模块130连接，第三采集模块910可以用于采集电芯111的电学数据，电学数据包括电芯111所在回路的电压值、电流值以及电芯111的绝缘电阻值中的至少一项。
上述电学数据也包括在第三运行数据内，可以根据其中至少一个电学数据判定是否符合电学类型的数据检测条件。该电学类型的数据检测条件可以包括绝缘电阻值小于电阻阈值，电芯111所在回路的电流值大于电流阈值，或者电芯111所在回路的电压值的下降速率大于速率阈值。即绝缘电阻值、电压值的下降速率和电流值中的至少一个满足条件，第三运行数据符合电学类型的数据检测条件。
需要说明的是，上述电学类型的数据检测条件满足时，表征电芯111所在回路可能出现短路或者自放电严重，由此容易引起热失控风险。需要进一步结合第一温度数据是否符合温度失控条件，从而确定电芯111处于短路异常还是由于回路短路导致存在热失控风险。
在这些实施例中，考虑了电芯111电学原因所导致的热失控风险，探索得到了电芯111内部热失控发生的根本原因，为后续热失控的分析和检测提供了参考。
请继续参看图9，基于上述实施例，提出本申请的电池包100的再一实施例，在该实施例中，数据处理模块130，还可以用于当根据电学数据确定第三运行数据符合对应类型的数据检测条件且第一温度数据不符合温度失控条件时，将第一检测结果指示为电芯111短路异常。
在本实施例中，在电学数据判定后，确定第一温度数据是否符合温度失控条件，能够确定电芯111短路异常是否导致电芯111存在热失控风险，实现了电芯111短路的精准异常分析。
在这些实施例中，结合电学数据、产气以及电芯111内部压力构成了一级信号采集系统，由此触发第一温度数据是否符合温度失控条件的判断，能够从热失控产生的各项根本原因出发，在实现热失控风险预警的同时，全方位发现热失控产生的诱因。
基于上述实施例，提出本申请电池包100的再一实施例，在本实施例中，上述第二采集模块140可以包括第二温度采集单元141。该第二温度采集单元141可以用于在第一检测结果指示任一电芯111存在热失控风险时启动，并在启动后采集电芯111的第二温度数据，其中，第二运行数据可以包括第二温度数据。
数据处理模块130，还可以用于在第二温度数据大于外部温度阈值时，将第二检测结果指示为电芯111存在二级热失控风险。
由此，在数据处理模块130根据第一运行数据，确认电芯111存在热失控风险时，可以触发第二温度采集单元141启动，并从第二温度采集单元141处获得第二温度数据。在第二温度数据大于外部温度阈值时，表示电池包100内电芯模组110外部也存在温度异常，此时电芯111存在二级热失控风险。
上述第二温度采集单元141可以分布在电芯模组110周围，也可以分布在电池包100除电芯模组110以外的其他部件周围。第二温度采集单元141可以分别检测模组的温度以及电池包100内的温度，当任一温度超过温度预警值，表示电芯111存在二级热失控风险，则数据处理模块130可以发出热失控二级预警信号，由此提升热失控风险等级。反之，当第二温度采集单元141采集的所有温度均未超过温度预警值，表示此时电芯111仍然存在热失控风险，但未出现外溢风险。
通过本方案，一方面能够捕获电芯111内部外溢出的热失控风险信号，及时了解了电芯111内部外溢出的热失控风险程度，另一方面也可反应由外部高温等外部条件改变引起的外部信号变化，能够实现由于外部因素造成的热失控风险预警。
本实施例通过第二温度采集单元141的设置，为数据处理模块130依据第二运行数据实现热失控风险的二次检测提供了可选实现方式。且由于第二温度采集单元141是在第一检测结果指示任一电芯111存在热失控风险时才启动，因此第二温度采集单 元141的非连续工作状态可避免无效工作，大大提高了第二温度采集单元141的实际工作寿命。
请参看图9，基于上述实施例，提出本申请电池包100的再一实施例，在本实施例中，第二采集模块140除包括第二温度采集单元141以外，还可以包括外置气压和气体采集单元142。
上述外置气压和气体采集单元142可以在第一检测结果指示任一电芯111存在热失控风险时启动，并在启动后采集电芯模组110的外部气压数据和外部的至少一种类型的气体浓度。
数据处理模块130，还可以用于在外部气压数据大于外部气压阈值，外部的至少一种类型的气体浓度大于对应类型的浓度阈值，且第二温度数据小于或等于外部温度阈值时，将第二检测结果指示为产气异常二级预警。
其中外置气压和气体采集单元142外置气压和气体采集单元142的具体类型和异常判断逻辑可以参考电芯111中内置气压和气体采集单元810进行设置，在此不过多赘述。
在通过外置气压和气体采集单元142发现外部产气异常时，此时数据处理模块130可以获取第二温度采集单元141采集的第二温度数据，在第二温度数据大于对应的温度阈值时，可以发出产气热失控二级警报，提升热失控的风险等级。反之，则发出产气异常的二级警报，提升产气异常的风险等级。
需要说明的是，当外置气压和气体采集单元142发现外部产气异常，说明产气异常已经导致气体冲破电芯模组110的防爆阀，并外溢到电芯111外部，情况较为危险。通过不同情况下的风险等级提示，能够及时了解电池包100的异常原因以及危险程度，并对应采取措施。此外，通过内外部的气体和气压采集单元以及温度采集单元的结合设置，能够提高电池包100热失控和产气异常的识别精确度，防止误判。
请继续参看图9，基于上述实施例，提出本申请电池包100的再一实施例，在本实施例中，第二采集模块140可以包括烟雾浓度采集单元143。
烟雾浓度采集单元143可以用于在第一检测结果指示任一电芯111存在热失控风险时启动，并在启动后采集电芯模组110外部的烟雾浓度，第二运行数据包括烟雾浓度。其中，在烟雾浓度大于烟雾浓度预警值时，第二检测结果指示电芯111存在二级热失控风险。
上述烟雾浓度采集单元143可以分布在电芯模组110周围以及电池包100的除电芯模组110以外的其他位置，可以分别检测模组与电池包100内的烟雾浓度，进而将各自的烟雾浓度与各自的烟雾浓度预警值进行比较，当任意烟雾浓度超过对应的烟雾浓度预警值，表示电芯111存在二级热失控风险，可以由数据处理模块130发出电芯111热失控烟雾二级预警信号，提升热失控的风险等级，同时告知周边人群存在烟雾吸入等风险。反之，当烟雾浓度采集单元143采集的所有烟雾浓度均未超过烟雾浓 度预警值，表示此时电芯111仍然存在热失控风险，但暂时还未出现外溢风险。
通过本方案，一方面能够捕获电芯111内部外溢出的热失控风险信号，及时了解了电芯111内部外溢出的热失控风险程度，另一方面也可反应由外部高温、高压等外部条件改变引起的外部信号变化，能够实现由于外部因素造成的热失控风险预警。还能够发现电池包100产生烟雾的现象，提醒周围人群及时做出处理。
本实施例通过烟雾浓度采集单元143的设置，为数据处理模块130依据第二运行数据实现热失控风险的二次检测提供了可选实现方式。该烟雾浓度采集单元143可以和第二温度采集单元141结合设置，可以依据其中任一单元采集的数据确认电芯111存在二级热失控风险，提高了外部热失控风险检测的准确性。且由于烟雾浓度采集单元143是在第一检测结果指示任一电芯111存在热失控风险时才启动，因此烟雾浓度采集单元143的非连续工作状态可避免无效工作，大大提高了烟雾浓度采集单元143的实际工作寿命。
上文中结合图1至图9，详细描述了本申请实施例的电池包。在此基础上，本申请实施例还保护一种用电装置，该用电装置包括上述实施例所提供的电池包，因此用电装置具有电池包的全部有益效果。
请参看图10，基于上述实施例的电池包，本申请实施例还提供一种电池包的检测方法，该方法应用于数据处理模块，电池包可以包括电芯模组、第一采集模块和设置在电芯模组外部的第二采集模块，电芯模组可以包括至少一个电芯，第一采集模块可以包括至少一个第一采集单元，第一采集单元设置于电芯内，方法包括：
S101，获取第一采集模块采集的电芯的第一运行数据；
S102，根据第一运行数据对电芯进行热失控检测，得到第一检测结果；
S103，在第一检测指示任一电芯存在热失控风险时，控制第二采集模块启动，并获取第二采集模块采集的电芯外部的第二运行数据；
S104，通过第二运行数据对电芯是否存在热失控风险进行二次检测，得到第二检测结果。
在本申请实施例中，因为第一采集单元设置于电芯内，由此实现了对电芯内部运行数据的直接采集，更为真实地反映了电芯内部的运行工况，且是在根据电芯内部运行数据确认存在热失控风险后再启动电芯模组外部的第二采集模块，进而根据第二采集模块采集的第二运行数据进行二次检测，由此能够内外结合通过二级检测提高热失控预警检测的准确性。此外是在第一检测结果表征存在热失控风险才启动的，处于间断采集状态，提升了第二采集模块的使用寿命。
请继续参看图10，基于上述实施例，提出本申请电池包的检测方法的另一实施例，在该实施例中，在S102之后，方法还包括：
S105，在第一检测结果指示任一电芯存在热失控风险时，控制热管理模块平衡 电芯的温度。
在这些实施例中，通过热管理模块在一级预警产生后(即第一检测结果指示任一电芯存在热失控风险后)进行电芯温度平衡，相比相关技术能够超前执行电芯温度的降低操作，帮助降低电芯的热失控风险，提升电芯使用安全。
基于上述实施例，提出本申请电池包的检测方法的又一实施例，在该实施例中，第一采集单元包括第一温度采集单元和一级采集单元。
其中，根据第一运行数据对电芯进行热失控检测，得到第一检测结果，可以包括：获取一级采集单元采集的第三运行数据以及第一温度采集单元采集的第一温度数据，第一运行数据包括第三运行数据和第一温度数据；在第三运行数据符合对应类型的数据检测条件时，通过第一温度数据对电芯进行热失控检测。
上述第三运行数据可以参考前述进行设置，在这些实施例中，能够结合类似电学数据、产气以及电芯内部压力的第三运行数据构成一级信号采集系统，由此触发第一温度数据是否符合温度失控条件的判断，能够从热失控产生的各项根本原因出发，在实现热失控风险预警的同时，全方位发现热失控产生的诱因。
另外，结合上述实施例中的电池包的检测方法，本申请实施例可提供一种计算机存储介质来实现。该计算机存储介质上存储有计算机程序指令；该计算机程序指令被处理器执行时实现上述实施例中的任意一种电池包的检测方法。
另外，本申请实施例还提供了一种计算机程序产品，包括计算机程序，计算机程序被处理器执行时可实现前述方法实施例的步骤及相应内容。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (16)

  1. 一种电池包，包括：
    电芯模组，包括至少一个电芯；
    第一采集模块，包括至少一个第一采集单元，所述第一采集单元设置于所述电芯内，所述第一采集单元，用于采集所述电芯的第一运行数据；
    数据处理模块，与所述第一采集单元连接，用于根据所述第一运行数据对所述电芯进行热失控检测，得到第一检测结果；
    第二采集模块，设置于所述电芯模组的外部，用于在所述第一检测结果指示任一所述电芯存在热失控风险时启动，并在启动后采集所述电芯的第二运行数据；
    所述数据处理模块，还与所述第二采集模块连接，还用于通过所述第二运行数据对所述电芯是否存在热失控风险进行二次检测，得到第二检测结果。
  2. 根据权利要求1所述的电池包，其中，所述电池包还包括：
    热管理模块，与所述数据处理模块连接，用于在所述第一检测结果指示任一所述电芯存在热失控风险时，平衡所述电芯的温度。
  3. 根据权利要求1所述的电池包，其中，所述第一采集单元包括第一温度采集单元；
    所述第一温度采集单元，用于采集所述电芯的第一温度数据，所述第一运行数据包括所述第一温度数据；
    所述数据处理模块，用于通过所述第一温度数据对所述电芯进行热失控检测，并在所述第一温度数据符合温度失控条件时，将所述第一检测结果指示为电芯存在热失控风险。
  4. 根据权利要求3所述的电池包，其中，所述第一采集单元还包括 一级采集单元；
    所述一级采集单元，用于采集所述电芯的除所述第一温度数据以外的第三运行数据，所述第一运行数据包括所述第三运行数据；
    所述数据处理模块，用于在所述第三运行数据符合对应类型的数据检测条件时，通过所述第一温度数据对所述电芯进行热失控检测。
  5. 根据权利要求4所述的电池包，其中，所述电芯包括壳体和容纳于所述壳体的极片，所述一级采集单元包括：
    压力采集单元，所述压力采集单元与所述第一温度采集单元对应，所述压力采集单元贴合于所述壳体的内表面和/或所述极片，所述压力采集单元用于采集所述电芯的压力数据，所述第三运行数据包括所述压力数据；
    其中，当所述压力数据大于压力阈值时，所述第三运行数据符合对应类型的数据检测条件。
  6. 根据权利要求5所述的电池包，其中，所述数据处理模块，还用于在所述压力数据大于压力阈值且所述第一温度数据不符合温度失控条件时，将所述第一检测结果指示为电芯受力异常。
  7. 根据权利要求4所述的电池包，其中，所述电芯包括裸电芯、壳体和顶盖，所述裸电芯收容于所述壳体和所述顶盖围合形成的容纳空间内；所述一级采集单元包括：
    内置气压和气体采集单元，设置于所述顶盖和所述裸电芯之间，用于采集所述壳体内的气压数据和至少一种类型的气体浓度；
    其中，当所述气压数据大于气压阈值，且任一种类型的所述气体浓度大于对应类型的浓度阈值时，所述第三运行数据符合对应类型的数据检测条件。
  8. 根据权利要求7所述的电池包，其中，所述数据处理模块，还用于在当所述气压数据大于气压阈值，所述第一温度数据不符合温度失控条 件且任一种类型的所述气体浓度大于对应类型的浓度阈值时，将所述第一检测结果指示为电芯产气异常。
  9. 根据权利要求4所述的电池包，其中，所述电池包还包括：
    第三采集模块，用于采集所述电芯对应的电学数据，所述电学数据包括所述电芯所在回路的电压值、电流值以及所述电芯的绝缘电阻值中的至少一项；
    其中，当所述绝缘电阻值小于电阻阈值，所述电流值大于电流阈值，或者所述电压值的下降速率大于速率阈值时，所述第三运行数据符合对应类型的数据检测条件。
  10. 根据权利要求9所述的电池包，其中，所述数据处理模块，还用于当根据所述电学数据确定所述第三运行数据符合对应类型的数据检测条件且所述第一温度数据不符合温度失控条件时，将所述第一检测结果指示为电芯短路异常。
  11. 根据权利要求1所述的电池包，其中，所述第二采集模块包括：
    第二温度采集单元，用于在所述第一检测结果指示任一所述电芯存在热失控风险时启动，并在启动后采集所述电芯的第二温度数据，所述第二运行数据包括所述第二温度数据；
    所述数据处理模块，还用于在所述第二温度数据大于外部温度阈值时，将所述第二检测结果指示为电芯存在二级热失控风险。
  12. 根据权利要求11所述的电池包，其中，所述第二采集模块还包括：
    外置气压和气体采集单元，用于在所述第一检测结果指示任一所述电芯存在热失控风险时启动，并在启动后采集所述电芯模组的外部气压数据和外部的至少一种类型的气体浓度；
    所述数据处理模块，还用于在所述外部气压数据大于外部气压阈值， 外部的至少一种类型的气体浓度大于对应类型的浓度阈值，且所述第二温度数据小于或等于外部温度阈值时，将所述第二检测结果指示为产气异常二级预警。
  13. 根据权利要求1所述的电池包，其中，所述第二采集模块包括：
    烟雾浓度采集单元，用于在所述第一检测结果指示任一所述电芯存在热失控风险时启动，并在启动后采集所述电芯模组外部的烟雾浓度，所述第二运行数据包括所述烟雾浓度；
    其中，在所述烟雾浓度大于烟雾浓度预警值时，所述第二检测结果指示电芯存在二级热失控风险。
  14. 一种用电装置，所述用电装置包括权利要求1～13任一项所述的电池包。
  15. 一种电池包的检测方法，应用于数据处理模块，所述电池包包括电芯模组、第一采集模块和设置在所述电芯模组外部的第二采集模块，所述电芯模组包括至少一个电芯，所述第一采集模块包括至少一个第一采集单元，所述第一采集单元设置在所述电芯内，所述方法包括：
    获取第一采集模块采集的电芯的第一运行数据；
    根据所述第一运行数据对所述电芯进行热失控检测，得到第一检测结果；
    在所述第一检测结果指示任一所述电芯存在热失控风险时，控制第二采集模块启动，并获取所述第二采集模块采集的所述电芯外部的第二运行数据；
    通过所述第二运行数据对所述电芯是否存在热失控风险进行二次检测，得到第二检测结果。
  16. 一种计算机存储介质，所述计算机存储介质被处理器执行时，执行如权利要求15所述的电池包的检测方法。
PCT/CN2023/124707 2022-10-21 2023-10-16 电池包、用电装置、电池包的检测方法和计算机存储介质 WO2024083069A1 (zh)

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