Method and device for detecting thermal runaway state of lithium battery pack

Abstract

The invention discloses a method and a device for detecting a thermal runaway state of a lithium battery pack. The method comprises the following steps: constructing a state detection strategy of a target lithium battery pack in a vehicle; the real-time hydrogen concentration of the target lithium battery pack is obtained, and a target concentration interval corresponding to the real-time hydrogen concentration is determined according to a preset concentration threshold value; searching a preset adjustment coefficient range matched with the target concentration interval in a preset adjustment coefficient database to obtain a target adjustment coefficient range corresponding to the real-time hydrogen concentration; obtaining a target adjustment coefficient corresponding to the real-time hydrogen concentration according to the target model information of the vehicle; the real-time hydrogen concentration is adjusted according to the target adjustment coefficient, and the adjusted hydrogen concentration is obtained; and determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy. According to the invention, the state of the lithium battery pack can be timely and accurately obtained, and the method is suitable for early warning of thermal runaway so as to ensure higher safety.

Description

Technical Field

[0001] The present application relates to the field of lithium battery technology, and in particular to a method and device for detecting a thermal runaway state of a lithium battery pack. Background Art

[0002] With the rapid development of new energy vehicles and energy storage systems, lithium batteries have become the mainstream energy storage solution due to their high energy density, long life and low self-discharge rate. However, lithium batteries have safety risks during use, especially in extreme cases such as overcharging, overdischarging, and short circuits, which can easily cause thermal runaway. Thermal runaway can cause the internal temperature of the battery to rise sharply, which may eventually lead to explosion or fire. Therefore, the early warning system for thermal runaway of lithium batteries has become a research focus of the industry.

[0003] At present, the common thermal runaway detection solutions on the market mainly rely on pressure sensors and temperature sensors. However, these solutions have significant limitations. Although the pressure sensor can monitor the rapid changes in the internal pressure of the battery pack, it is easily disturbed by the external environment of the battery, resulting in frequent false alarms. Although the temperature sensor can monitor the temperature changes of the battery, due to the lag in the response of the sensor, it is often unable to capture the early signals of the rapid rise in the internal temperature of the battery in time. This makes the traditional detection methods show obvious shortcomings when facing sudden thermal runaway. Summary of the invention

[0004] The present application provides a method and device for detecting the thermal runaway state of a lithium battery pack. The present application can timely and accurately obtain the state of the lithium battery pack by detecting the hydrogen concentration, and is suitable for early warning of thermal runaway of the lithium battery to ensure higher safety.

[0005] In one aspect, the present application provides a method for detecting a thermal runaway state of a lithium battery pack, the method comprising:

[0006] Construct a status detection strategy for the target lithium battery pack in the vehicle;

[0007] Obtaining the real-time hydrogen concentration of the target lithium battery pack, and determining a target concentration range corresponding to the real-time hydrogen concentration according to a preset concentration threshold;

[0008] Searching a preset adjustment coefficient range matching the target concentration interval in a preset adjustment coefficient database to obtain a target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between a preset concentration interval and a preset adjustment coefficient range;

[0009] According to the target model information of the vehicle, searching for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range to obtain a target adjustment coefficient corresponding to the real-time hydrogen concentration;

[0010] Adjusting the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration;

[0011] According to the adjusted hydrogen concentration and the state detection strategy, the current state of the target lithium battery pack is determined; the current state indicates whether the target lithium battery pack is in a thermal runaway state.

[0012] In an exemplary embodiment, the step of constructing a state detection strategy for a target lithium battery pack in a vehicle includes:

[0013] Acquire first hydrogen content information generated by a preset lithium battery pack in a thermal runaway state, and obtain a corresponding relationship between the thermal runaway state and the first hydrogen content information; the preset lithium battery pack is a lithium battery pack with the same model as the target lithium battery pack but a different battery capacity;

[0014] According to the first hydrogen content information, the first capacity of the preset lithium battery pack, and the second capacity of the target lithium battery pack, a corresponding relationship between the second hydrogen content information and the first hydrogen content information is obtained; the second hydrogen content information is the hydrogen content information of the target lithium battery pack; the first capacity is less than the second capacity;

[0015] Determining a correspondence relationship between the thermal runaway state and the second hydrogen content information according to a correspondence relationship between the thermal runaway state and the first hydrogen content information and a correspondence relationship between the second hydrogen content information and the first hydrogen content information;

[0016] Constructing a first state detection strategy according to the correspondence between the thermal runaway state and the second hydrogen content information;

[0017] The state detection strategy is constructed according to the first state detection strategy.

[0018] In an exemplary embodiment, constructing the state detection strategy according to the first state detection strategy includes:

[0019] Acquire third hydrogen content information generated by the preset lithium battery pack in an early fault state, and obtain a corresponding relationship between the early fault state and the third hydrogen content information;

[0020] Obtaining a correspondence between the second hydrogen content information and the third hydrogen content information according to the third hydrogen content information, the first capacity, and the second capacity;

[0021] Determining a correspondence relationship between the early fault state and the second hydrogen content information according to a correspondence relationship between the early fault state and the second hydrogen content information and a correspondence relationship between the second hydrogen content information and the third hydrogen content information;

[0022] Constructing a second state detection strategy according to the correspondence between the early fault state and the second hydrogen content information;

[0023] The state detection strategy is constructed according to the first state detection strategy and the second state detection strategy.

[0024] In an exemplary embodiment, constructing the state detection strategy according to the first state detection strategy and the second state detection strategy includes:

[0025] Acquire fourth hydrogen content information generated by the preset lithium battery pack in a healthy state, and obtain a corresponding relationship between the healthy state and the fourth hydrogen content information;

[0026] Obtaining a correspondence between the second hydrogen content information and the fourth hydrogen content information according to the fourth hydrogen content information, the first capacity, and the second capacity;

[0027] determining a correspondence between the health status and the second hydrogen content information according to a correspondence between the health status and the fourth hydrogen content information and a correspondence between the second hydrogen content information and the fourth hydrogen content information;

[0028] constructing a third state detection strategy according to the correspondence between the health state and the second hydrogen content information;

[0029] The state detection strategy is constructed according to the first state detection strategy, the second state detection strategy, and the third state detection strategy.

[0030] In an exemplary embodiment, the obtaining the real-time hydrogen concentration of the target lithium battery pack and determining the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold value includes:

[0031] When the real-time hydrogen concentration is less than a first preset concentration threshold, determining the target concentration interval corresponding to the real-time hydrogen concentration to be the first preset concentration interval;

[0032] When the real-time hydrogen concentration is greater than the first preset concentration threshold and less than the second preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval;

[0033] When the real-time hydrogen concentration is greater than or equal to the second preset concentration threshold and less than a third preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval;

[0034] The first preset concentration threshold is smaller than the second preset concentration threshold, and the second preset concentration threshold is smaller than the third preset concentration threshold.

[0035] In an exemplary embodiment, searching a preset adjustment coefficient database for a preset adjustment coefficient range that matches the target concentration interval to obtain a target adjustment coefficient range corresponding to the real-time hydrogen concentration includes:

[0036] Searching a preset adjustment coefficient database for a preset adjustment coefficient range that matches the target concentration range;

[0037] When the target concentration interval corresponding to the real-time hydrogen concentration is the first preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the first target adjustment coefficient range;

[0038] When the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the second target adjustment coefficient range;

[0039] When the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the third target adjustment coefficient range;

[0040] Among them, the first target adjustment coefficient range is smaller than the second target adjustment coefficient range, and the second target adjustment coefficient range is smaller than the third target adjustment coefficient range.

[0041] In an exemplary embodiment, determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy includes:

[0042] Determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy;

[0043] When the current state indicates that the target lithium battery pack is in the thermal runaway state, a first prompt message is generated.

[0044] In an exemplary embodiment, the method further comprises:

[0045] Acquire hydrogen concentration information of the target lithium battery pack within a preset period of time, and determine the hydrogen concentration rising rate of the target lithium battery pack;

[0046] The current state of the target lithium battery pack is determined according to the hydrogen concentration rising rate and a preset rate threshold.

[0047] In an exemplary embodiment, determining the current state of the target lithium battery pack according to the hydrogen concentration rising rate and a preset rate threshold includes:

[0048] When the hydrogen concentration rising rate is less than a first preset rate threshold, determining that the current state of the target lithium battery pack is a healthy state;

[0049] When the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than the second preset rate threshold, determining that the current state of the target lithium battery pack is a coolant leakage state;

[0050] When the hydrogen concentration rising rate is greater than or equal to the second preset rate threshold, determining that the current state of the target lithium battery pack is the thermal runaway state;

[0051] The first preset rate threshold is smaller than the second preset rate threshold.

[0052] On the other hand, a device for detecting a thermal runaway state of a lithium battery pack is provided, the device comprising:

[0053] A state detection strategy building module is used to build a state detection strategy for a target lithium battery pack in a vehicle;

[0054] A target concentration interval determination module, used to obtain the real-time hydrogen concentration of the target lithium battery pack, and determine the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold;

[0055] a target adjustment coefficient range acquisition module, used to search a preset adjustment coefficient range matching the target concentration interval in a preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between a preset concentration interval and a preset adjustment coefficient range;

[0056] A target adjustment coefficient acquisition module, used to search for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range according to the target model information of the vehicle, and obtain the target adjustment coefficient corresponding to the real-time hydrogen concentration;

[0057] An adjusted hydrogen concentration acquisition module is used to adjust the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration;

[0058] The current state determination module is used to determine the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state indicates whether the target lithium battery pack is in a thermal runaway state.

[0059] On the other hand, an electronic device is provided, including a processor and a memory, wherein the processor is used to store the memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the method for detecting the thermal runaway state of a lithium battery pack as described above.

[0060] On the other hand, a computer-readable storage medium is provided, wherein the computer-readable storage medium contains at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by a processor to implement the above-mentioned method for detecting thermal runaway state of a lithium battery pack.

[0061] The method and device for detecting thermal runaway state of a lithium battery pack provided in this application have the following technical effects:

[0062] The present application constructs a state detection strategy for a target lithium battery pack in a vehicle; obtains the real-time hydrogen concentration of the target lithium battery pack, and determines the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold; searches for a preset adjustment coefficient range that matches the target concentration interval in a preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between a preset concentration interval and a preset adjustment coefficient range; searches for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range according to the target model information of the vehicle to obtain the target adjustment coefficient corresponding to the real-time hydrogen concentration; adjusts the real-time hydrogen concentration according to the target adjustment coefficient to obtain the adjusted hydrogen concentration; determines the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state characterizes whether the target lithium battery pack is in a thermal runaway state. The present application can timely and accurately obtain the state of the lithium battery pack by detecting the hydrogen concentration. Compared with the temperature or pressure detection method, it has a faster response speed and a higher accuracy rate, and is suitable for early warning of thermal runaway to ensure higher safety.

[0063] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions and advantages of the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 It is a flow chart of a method for detecting a thermal runaway state of a lithium battery pack provided in an embodiment of this specification;

[0066] Figure 2 It is a flowchart of building a state detection strategy according to a first state detection strategy provided by an embodiment of this specification;

[0067] Figure 3 It is a flowchart of constructing a state detection strategy according to a first state detection strategy and a second state detection strategy provided by an embodiment of this specification;

[0068] Figure 4 It is a flowchart of constructing a state detection strategy according to a first state detection strategy, a second state detection strategy and a third state detection strategy provided by an embodiment of this specification;

[0069] Figure 5 It is a schematic diagram of a process for determining a target concentration range provided in an embodiment of this specification;

[0070] Figure 6 It is a flowchart of determining a target adjustment coefficient range provided by an embodiment of this specification;

[0071] Figure 7 is a schematic diagram of a process for generating first prompt information provided by an embodiment of this specification;

[0072] Figure 8 is a schematic diagram of a process for determining the current state of a target lithium battery pack provided in an embodiment of this specification;

[0073] Fig. 9 It is a schematic diagram of a process for determining the current state of a target lithium battery pack according to a preset rate threshold provided in an embodiment of this specification;

[0074] Fig.10 It is a schematic diagram of a detection device for a thermal runaway state of a lithium battery pack provided in an embodiment of this specification;

[0075] Fig.11 It is a structural schematic diagram of a server for a method for detecting a thermal runaway state of a lithium battery pack provided in an embodiment of this specification. DETAILED DESCRIPTION

[0076] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0077] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0078] The following describes a method for detecting thermal runaway of a lithium battery pack of the present application. Figure 1 It is a flow chart of a method for detecting thermal runaway state of a lithium battery pack provided in an embodiment of this specification. This specification provides method operation steps as described in the embodiment or flow chart, but may include more or fewer operation steps based on conventional or non-creative labor. The sequence of steps listed in the embodiment is only one way of executing the steps among many sequences, and does not represent the only execution sequence. When the actual system or server product is executed, it can be executed in sequence or in parallel (for example, in a parallel processor or multi-threaded processing environment) according to the method shown in the embodiment or the accompanying drawings. Specifically, Figure 1 As shown, the method may include:

[0079] S1: Construct a status detection strategy for the target lithium battery pack in the vehicle.

[0080] In an exemplary embodiment, if Figure 2 As shown, the state detection strategy of building a target lithium battery pack in a vehicle may include:

[0081] S11: Acquire first hydrogen content information generated by a preset lithium battery pack in a thermal runaway state, and obtain a corresponding relationship between the thermal runaway state and the first hydrogen content information; the preset lithium battery pack is a lithium battery pack with the same model as the target lithium battery pack but a different battery capacity;

[0082] S12: obtaining a correspondence between second hydrogen content information and the first hydrogen content information according to the first hydrogen content information, the first capacity of the preset lithium battery pack, and the second capacity of the target lithium battery pack; the second hydrogen content information is the hydrogen content information of the target lithium battery pack; the first capacity is less than the second capacity;

[0083] S13: determining a correspondence relationship between the thermal runaway state and the second hydrogen content information according to a correspondence relationship between the thermal runaway state and the first hydrogen content information and a correspondence relationship between the second hydrogen content information and the first hydrogen content information;

[0084] S14: constructing a first state detection strategy according to the correspondence between the thermal runaway state and the second hydrogen content information;

[0085] S15: Construct the state detection strategy according to the first state detection strategy.

[0086] In the embodiment of the present application, by obtaining the first hydrogen content information generated by the preset lithium battery pack in the thermal runaway state, the corresponding relationship between the thermal runaway state and the first hydrogen content information is obtained. Since the preset lithium battery pack and the target lithium battery pack have the same model but different capacities, and the capacity of the lithium battery pack is fixed, the corresponding relationship between the second hydrogen content information generated by the target lithium battery pack and the first hydrogen content information can be obtained according to the capacities of the two lithium battery packs and the first hydrogen content information, thereby obtaining the corresponding relationship between the thermal runaway state and the second hydrogen content information, that is, when the target lithium battery pack is in the thermal runaway state, the target lithium battery pack can theoretically generate hydrogen content, and construct a first state detection strategy. When the detection application is subsequently performed, if the current hydrogen content obtained is within the content range corresponding to the thermal runaway state, it can be confirmed that the current state of the target lithium battery pack is a thermal runaway state, wherein the capacity of the preset lithium battery pack is less than the capacity of the target lithium battery pack, and the battery capacity of the preset lithium battery pack can be 1-10Ah.

[0087] In an embodiment of the present application, a preset lithium battery pack can be caused to thermally run away by heating, puncturing or overcharging, thereby obtaining information on the hydrogen content generated by the preset lithium battery pack during the thermal runaway process, and monitoring different states of the preset lithium battery pack to construct a state detection strategy.

[0088] In the embodiment of the present application, if the capacity of the preset lithium battery pack is A1, the capacity of the target lithium battery pack is A2, the first hydrogen content generated by the preset lithium battery pack in the thermal runaway state is C1, and the hydrogen content generated by the target lithium battery pack is C2, then C2 can be obtained by the following formula:

[0089]

[0090] The embodiment of the present application constructs a first state detection strategy by acquiring the correspondence between the second hydrogen content information and the thermal runaway state, thereby obtaining a state detection strategy that can accurately determine whether the lithium battery pack is in a thermal runaway state.

[0091] In an exemplary embodiment, if Figure 3 As shown, constructing the state detection strategy according to the first state detection strategy may include:

[0092] S151: Obtaining third hydrogen content information generated by the preset lithium battery pack in an early fault state, and obtaining a corresponding relationship between the early fault state and the third hydrogen content information;

[0093] S152: Obtaining a correspondence between the second hydrogen content information and the third hydrogen content information according to the third hydrogen content information, the first capacity, and the second capacity;

[0094] S153: determining a correspondence relationship between the early fault state and the second hydrogen content information according to a correspondence relationship between the early fault state and the second hydrogen content information and a correspondence relationship between the second hydrogen content information and the third hydrogen content information;

[0095] S154: constructing a second state detection strategy according to the correspondence between the early fault state and the second hydrogen content information;

[0096] S155: Construct the state detection strategy according to the first state detection strategy and the second state detection strategy.

[0097] In the embodiment of the present application, by obtaining the third hydrogen content information generated by the preset lithium battery pack in the early fault state, obtaining the correspondence between the early fault state and the third hydrogen content information, and obtaining the correspondence between the second hydrogen content information generated by the target lithium battery pack and the third hydrogen content information according to the capacity of the two lithium battery packs and the third hydrogen content information, thereby obtaining the correspondence between the early fault state and the second hydrogen content information, that is, when the target lithium battery pack is in the early fault state, the target lithium battery pack can theoretically produce hydrogen content, and construct a second state detection strategy. When the detection application is subsequently performed, if the current hydrogen content obtained is within the content range corresponding to the early fault state, it can be confirmed that the current state of the target lithium battery pack is an early fault state.

[0098] In the embodiment of the present application, if the third hydrogen content generated by the lithium battery pack in the early fault state is preset to C3, then C2 can be obtained by the following formula:

[0099]

[0100] The embodiment of the present application constructs a second state detection strategy by acquiring the correspondence between the second hydrogen content information and the early fault state, thereby obtaining a state detection strategy, which can accurately determine whether the lithium battery pack is in a thermal runaway state or an early fault state, thereby achieving early warning of thermal runaway of the lithium battery.

[0101] In an exemplary embodiment, if Figure 4 As shown, constructing the state detection strategy according to the first state detection strategy and the second state detection strategy may include:

[0102] S1551: Obtain fourth hydrogen content information generated by the preset lithium battery pack in a healthy state, and obtain a corresponding relationship between the healthy state and the fourth hydrogen content information;

[0103] S1552: Obtaining a correspondence between the second hydrogen content information and the fourth hydrogen content information according to the fourth hydrogen content information, the first capacity, and the second capacity;

[0104] S1553: Determine a correspondence relationship between the health status and the second hydrogen content information according to a correspondence relationship between the health status and the fourth hydrogen content information and a correspondence relationship between the second hydrogen content information and the fourth hydrogen content information;

[0105] S1554: constructing a third state detection strategy according to the correspondence between the health state and the second hydrogen content information;

[0106] S1555: Construct the state detection strategy according to the first state detection strategy, the second state detection strategy, and the third state detection strategy.

[0107] In the embodiment of the present application, by obtaining the fourth hydrogen content information generated by the preset lithium battery pack in a healthy state, the corresponding relationship between the healthy state and the fourth hydrogen content information is obtained, and the corresponding relationship between the second hydrogen content information and the fourth hydrogen content information generated by the target lithium battery pack is obtained according to the capacity of the two lithium battery packs and the fourth hydrogen content information, thereby obtaining the corresponding relationship between the healthy state and the second hydrogen content information, that is, when the target lithium battery pack is in a healthy state, the hydrogen content that the target lithium battery pack will theoretically produce, and constructing a third state detection strategy. When the detection application is subsequently performed, if the current hydrogen content obtained is within the content range corresponding to the healthy state, it can be confirmed that the current state of the target lithium battery pack is a healthy state.

[0108] In the embodiment of the present application, if the third hydrogen content generated by the lithium battery pack in the early fault state is preset to C4, then C2 can be obtained by the following formula:

[0109]

[0110] In the embodiment of the present application, in addition to constructing the first state detection strategy, the second state detection strategy, and the third state detection strategy respectively as described above, it is also possible to obtain the corresponding information between the hydrogen content generated by the preset lithium battery pack and each state by monitoring the entire process from a normal healthy state to a thermal runaway state of the preset lithium battery pack based on the above-mentioned correspondence relationship, and obtain the state detection strategy of the target lithium battery pack.

[0111] In the embodiment of the present application, combined with the adjusted hydrogen concentration obtained by subsequent adjustment of the adjustment coefficient, the above-mentioned state detection strategy can be determined as follows: when the adjusted hydrogen concentration is between 0-2000ppm, it can be determined that the current state of the target lithium battery pack is a healthy state; when the adjusted hydrogen concentration is between 2000-10000ppm, it can be determined that the current state of the target lithium battery pack is an early fault state; when the adjusted hydrogen concentration is between 10000-40000ppm, it can be determined that the current state of the target lithium battery pack is a thermal runaway state.

[0112] The embodiment of the present application obtains the correspondence between the second hydrogen content information and the health status, constructs a third state detection strategy, and thus obtains a state detection strategy, which can quickly and accurately determine the state of the lithium battery pack (healthy state, early fault state or thermal runaway state), improve the detection efficiency, and is suitable for early warning of thermal runaway of lithium batteries to ensure higher safety.

[0113] S2: Obtain the real-time hydrogen concentration of the target lithium battery pack, and determine the target concentration range corresponding to the real-time hydrogen concentration according to a preset concentration threshold.

[0114] In an embodiment of the present application, a thermal conductivity hydrogen sensor is installed at a preset position of the target lithium battery, and the preset position may be at the exhaust valve of the battery box or at the battery management system. The real-time hydrogen concentration of the target lithium battery pack is obtained through the thermal conductivity hydrogen sensor. The thermal conductivity hydrogen sensor can detect slight changes in the gas in the early stage of thermal runaway. Compared with temperature or pressure sensors, the reaction speed is faster and the detection delay can be effectively avoided. In addition, the thermal conductivity hydrogen sensor is more focused on detecting the gas produced by the chemical reaction inside the battery. Compared with the pressure sensor that is easily affected by the external environment, the false alarm rate can be significantly reduced. Moreover, the thermal conductivity hydrogen sensor can detect extremely low concentration hydrogen leakage and can provide more timely and accurate early warning signals, which is suitable for early warning of thermal runaway of lithium batteries, thereby ensuring higher safety.

[0115] In the embodiment of the present application, if the real-time hydrogen content of the target lithium battery pack is C5 and the volume is V, the real-time hydrogen concentration C6 can be obtained by the following formula:

[0116]

[0117] In an exemplary embodiment, if Figure 5 As shown, the step of obtaining the real-time hydrogen concentration of the target lithium battery pack and determining the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold may include:

[0118] S21: when the real-time hydrogen concentration is less than a first preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the first preset concentration interval;

[0119] S22: when the real-time hydrogen concentration is greater than the first preset concentration threshold and less than the second preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval;

[0120] S23: when the real-time hydrogen concentration is greater than or equal to the second preset concentration threshold and less than the third preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval;

[0121] The first preset concentration threshold is smaller than the second preset concentration threshold, and the second preset concentration threshold is smaller than the third preset concentration threshold.

[0122] In an embodiment of the present application, the real-time hydrogen concentration is compared with a preset concentration threshold to determine a target concentration interval corresponding to the real-time hydrogen concentration. When the real-time hydrogen concentration is less than the first preset concentration threshold, the target concentration interval corresponding to the real-time hydrogen concentration is determined to be the first preset concentration interval; when the real-time hydrogen concentration is greater than the first preset concentration threshold and less than the second preset concentration threshold, the target concentration interval corresponding to the real-time hydrogen concentration is determined to be the second preset concentration interval; when the real-time hydrogen concentration is greater than or equal to the second preset concentration threshold and less than the third preset concentration threshold, the target concentration interval corresponding to the real-time hydrogen concentration is determined to be the third preset concentration interval; wherein, the first preset concentration threshold may be 2000ppm, and the first preset concentration interval may be 0-2000ppm; the second preset concentration threshold may be 10000ppm, and the second preset concentration interval may be 2000-10000ppm; the third preset concentration threshold may be 40000ppm, and the second preset concentration interval may be 10000-40000ppm.

[0123] The embodiment of the present application can quickly and accurately determine the target concentration range corresponding to the real-time hydrogen concentration by presetting the concentration threshold, thereby obtaining a more accurate adjustment coefficient and improving the detection efficiency and detection accuracy.

[0124] S3: searching a preset adjustment coefficient range matching the target concentration interval in a preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between preset concentration intervals and preset adjustment coefficient ranges.

[0125] In an exemplary embodiment, if Figure 6 As shown, searching the preset adjustment coefficient range matching the target concentration interval in the preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration may include:

[0126] S31: searching a preset adjustment coefficient range matching the target concentration range in a preset adjustment coefficient database;

[0127] S32: when the target concentration interval corresponding to the real-time hydrogen concentration is the first preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the first target adjustment coefficient range;

[0128] S33: when the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the second target adjustment coefficient range;

[0129] S34: when the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the third target adjustment coefficient range;

[0130] Among them, the first target adjustment coefficient range is smaller than the second target adjustment coefficient range, and the second target adjustment coefficient range is smaller than the third target adjustment coefficient range.

[0131] In an embodiment of the present application, after obtaining the target concentration interval corresponding to the real-time hydrogen concentration, a preset adjustment coefficient range matching the target concentration interval is searched in a preset adjustment coefficient database. When the target concentration interval corresponding to the real-time hydrogen concentration is the first preset concentration interval, the target adjustment coefficient range corresponding to the real-time hydrogen concentration is determined to be the first target adjustment coefficient range; when the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval, the target adjustment coefficient range corresponding to the real-time hydrogen concentration is determined to be the second target adjustment coefficient range; when the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval, the target adjustment coefficient range corresponding to the real-time hydrogen concentration is determined to be the third target adjustment coefficient range; wherein, the first target adjustment coefficient range may be 0-0.01, the second target adjustment coefficient range may be 0.01-0.25, and the first target adjustment coefficient range may be 0.25-1. That is, when the target concentration range corresponding to the real-time hydrogen concentration is 0-2000ppm, the corresponding target adjustment coefficient range is 0-0.01; when the target concentration range corresponding to the real-time hydrogen concentration is 2000-10000ppm, the corresponding target adjustment coefficient range is 0.01-0.25; when the target concentration range corresponding to the real-time hydrogen concentration is 10000-40000ppm, the corresponding target adjustment coefficient range is 0.25-1.

[0132] In the embodiment of the present application, the above-mentioned preset adjustment coefficient database includes the corresponding relationship between the preset concentration interval and the preset adjustment coefficient range. Therefore, after determining the target concentration interval corresponding to the real-time hydrogen concentration, the adjustment coefficient range corresponding to this target concentration interval can be directly obtained by searching the preset adjustment coefficient database, making the entire detection process faster and more accurate.

[0133] After obtaining the target concentration interval corresponding to the real-time hydrogen concentration, the embodiment of the present application can quickly and accurately obtain the target adjustment coefficient range corresponding to the target concentration interval by searching the preset adjustment coefficient database, thereby improving the detection efficiency.

[0134] S4: According to the target model information of the vehicle, searching for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range to obtain a target adjustment coefficient corresponding to the real-time hydrogen concentration.

[0135] In an embodiment of the present application, after obtaining the target adjustment coefficient range corresponding to the real-time hydrogen concentration, the corresponding target adjustment coefficient is determined within the target adjustment coefficient range based on the vehicle model information, and the adjustment coefficient corresponding to the same model within an adjustment coefficient range is fixed.

[0136] The embodiment of the present application determines the corresponding adjustment coefficient through the specific model information of the vehicle, which can improve the applicability of the detection method of the thermal runaway state of the lithium battery pack for different vehicle models, improve the accuracy of the detection, effectively judge the state of the lithium battery pack, and ensure higher safety.

[0137] S5: adjusting the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration.

[0138] In the embodiment of the present application, if the real-time hydrogen concentration is C6 and the target adjustment coefficient is D, the adjusted hydrogen concentration C can be obtained by the following formula:

[0139] C=C6×D

[0140] In the embodiment of the present application, the real-time hydrogen concentration can be adjusted by the target adjustment coefficient corresponding to the real-time hydrogen concentration to obtain the adjusted hydrogen concentration. A more accurate state judgment can be made based on the obtained adjusted hydrogen concentration, thereby improving the accuracy of detection.

[0141] S6: Determine the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state indicates whether the target lithium battery pack is in a thermal runaway state.

[0142] In an exemplary embodiment, if Figure 7 As shown, determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy may include:

[0143] S61: determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy;

[0144] S62: When the current state indicates that the target lithium battery pack is in the thermal runaway state, generate first prompt information.

[0145] In the embodiment of the present application, after the hydrogen concentration is adjusted, the current state of the target lithium battery pack can be determined according to the state detection strategy. When the hydrogen concentration is adjusted to 0-2000ppm, the current state of the target lithium battery pack can be determined to be a healthy state; when the hydrogen concentration is adjusted to 2000-10000ppm, the current state of the target lithium battery pack can be determined to be an early fault state; when the hydrogen concentration is adjusted to 10000-40000ppm, the current state of the target lithium battery pack can be determined to be a thermal runaway state.

[0146] In an embodiment of the present application, after the current state of the standard lithium battery pack is determined, different prompt information can be generated according to the current state, not limited to the thermal runaway state, so as to provide timely warnings, facilitate timely inspection and maintenance of abnormal conditions, improve safety, and avoid the occurrence of safety accidents.

[0147] The embodiment of the present application can timely and accurately obtain the current status of the target lithium battery pack according to the adjustment of hydrogen concentration and status detection strategy, and generate corresponding prompt information, so as to provide early warning prompts in time and effectively improve the safety of lithium battery pack use.

[0148] In an exemplary embodiment, if Figure 8 As shown, the method may also include:

[0149] S71: Acquire hydrogen concentration information of the target lithium battery pack within a preset period of time, and determine a rate of increase of hydrogen concentration of the target lithium battery pack;

[0150] S72: Determine the current state of the target lithium battery pack according to the hydrogen concentration rising rate and a preset rate threshold.

[0151] In the embodiment of the present application, in addition to determining the current state of the target lithium battery pack by adjusting the hydrogen concentration as described above, the state of the lithium battery pack can also be determined by the hydrogen concentration rising rate of the target lithium battery pack. The hydrogen concentration information of the target lithium battery pack within a preset time period is obtained (acquired based on the real-time hydrogen concentration, no adjustment is required), the hydrogen concentration rising rate of the target lithium battery pack is obtained, and then the current state of the target lithium battery pack is determined by comparing the hydrogen concentration rising rate with the preset rate threshold.

[0152] The embodiment of the present application can also promptly and accurately determine the current state of the lithium battery pack by monitoring the rate of increase of hydrogen concentration in real time, thereby improving detection accuracy and efficiency.

[0153] In an exemplary embodiment, if Fig. 9 As shown, determining the current state of the target lithium battery pack according to the hydrogen concentration rising rate and the preset rate threshold may include:

[0154] S721: When the hydrogen concentration rising rate is less than a first preset rate threshold, determining that the current state of the target lithium battery pack is a healthy state;

[0155] S722: When the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than the second preset rate threshold, determining that the current state of the target lithium battery pack is a coolant leakage state;

[0156] S723: When the hydrogen concentration rising rate is greater than or equal to the second preset rate threshold, determining that the current state of the target lithium battery pack is the thermal runaway state;

[0157] The first preset rate threshold is smaller than the second preset rate threshold.

[0158] In the embodiment of the present application, after obtaining the hydrogen concentration rising rate, it is compared with the preset rate threshold. When the hydrogen concentration rising rate is less than the first preset rate threshold, it is determined that the current state of the target lithium battery pack is a healthy state; when the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold, and less than the second preset rate threshold, it is determined that the current state of the target lithium battery pack is a coolant leakage state; when the hydrogen concentration rising rate is greater than or equal to the second preset rate threshold, it is determined that the current state of the target lithium battery pack is a thermal runaway state. Wherein, the first preset rate threshold may be 100ppm / s, and the first preset rate threshold may be 1000ppm / s, that is, when the hydrogen concentration rising rate is less than 100ppm / s, it can be determined that the current state of the target lithium battery pack is a healthy state; when the hydrogen concentration rising rate is greater than or equal to 1000ppm / s, it can be determined that the current state of the target lithium battery pack is a thermal runaway state; when the hydrogen concentration rising rate is greater than or equal to 100ppm / s, and less than 1000ppm / s, it can be determined that the current state of the target lithium battery pack is a coolant leakage state.

[0159] The embodiment of the present application can determine the speed of the hydrogen concentration rise rate by comparing the hydrogen concentration rise rate with a preset rate threshold, and based on the speed of the hydrogen concentration rise rate, quickly and accurately determine the current state (healthy state, coolant leakage state or thermal runaway state) of the target lithium battery pack to avoid detection delays.

[0160] In an exemplary embodiment, determining that the current state of the target lithium battery pack is a coolant leakage state may include:

[0161] When the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than the second preset rate threshold, determining that the current state of the target lithium battery pack is a coolant leakage state;

[0162] When it is determined that the current state of the target lithium battery pack is the coolant leakage state, a second prompt information is generated.

[0163] In an embodiment of the present application, when the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than the second preset rate threshold, it can be determined that the current state of the target lithium battery pack is a coolant leakage state, and a second prompt message will be generated, that is, when the hydrogen concentration rising rate is greater than or equal to 100ppm / s and less than 1000ppm / s, it can be determined that the current state of the target lithium battery pack is a coolant leakage state, and a corresponding second prompt message will be generated for early warning, so as to facilitate timely inspection and maintenance, improve the safety of lithium battery use, and avoid the occurrence of safety accidents.

[0164] In the embodiment of the present application, in addition to generating prompt information when it is determined that the current state of the target lithium battery pack is a coolant leakage state, corresponding prompt information can also be generated when it is determined to be a healthy state or a thermal runaway state, so as to facilitate timely and accurate corresponding early warning prompts.

[0165] When the embodiment of the present application determines that the current state of the target lithium battery pack is a coolant leakage state, a prompt message is generated, which can effectively provide an early warning prompt so that corresponding inspections and maintenance can be performed in time according to the current state of the lithium battery pack, thereby effectively improving the safety of the lithium battery pack.

[0166] The embodiment of the present application constructs a status detection strategy for the lithium battery pack, obtains the real-time hydrogen concentration through a thermal conductivity hydrogen sensor, and determines its corresponding adjustment coefficient to obtain the corresponding adjusted hydrogen concentration. Then, based on the adjusted hydrogen concentration and the status detection strategy, the current status of the lithium battery pack is quickly and accurately determined, and corresponding prompt information can be generated in time to facilitate timely corresponding troubleshooting and maintenance. Compared with traditional temperature or pressure detection methods, the response speed is faster and the accuracy is higher. It is suitable for early warning of lithium batteries, ensuring higher safety and avoiding the occurrence of safety accidents.

[0167] The embodiment of this specification also provides a device for detecting a thermal runaway state of a lithium battery pack, and the device may include:

[0168] A state detection strategy building module 1010 is used to build a state detection strategy for a target lithium battery pack in a vehicle;

[0169] The target concentration interval determination module 1020 is used to obtain the real-time hydrogen concentration of the target lithium battery pack and determine the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold;

[0170] The target adjustment coefficient range acquisition module 1030 is used to search the preset adjustment coefficient range matching the target concentration interval in the preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes the corresponding relationship between the preset concentration interval and the preset adjustment coefficient range;

[0171] A target adjustment coefficient acquisition module 1040 is used to search for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range according to the target model information of the vehicle, and obtain a target adjustment coefficient corresponding to the real-time hydrogen concentration;

[0172] An adjusted hydrogen concentration acquisition module 1050 is used to adjust the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration;

[0173] The current state determination module 1060 is used to determine the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state represents whether the target lithium battery pack is in a thermal runaway state.

[0174] In an exemplary embodiment, the state detection strategy construction module 1010 may include:

[0175] A submodule for obtaining a correspondence between a thermal runaway state and first hydrogen content information, for obtaining first hydrogen content information generated by a preset lithium battery pack in a thermal runaway state, and obtaining a correspondence between the thermal runaway state and the first hydrogen content information; the preset lithium battery pack is a lithium battery pack with the same model as the target lithium battery pack but a different battery capacity;

[0176] A submodule for obtaining a correspondence relationship between the second hydrogen content information and the first hydrogen content information, configured to obtain a correspondence relationship between the second hydrogen content information and the first hydrogen content information according to the first hydrogen content information, the first capacity of the preset lithium battery pack, and the second capacity of the target lithium battery pack; the second hydrogen content information is the hydrogen content information of the target lithium battery pack; the first capacity is less than the second capacity;

[0177] a thermal runaway state and a second hydrogen content information correspondence acquisition submodule, configured to determine a correspondence between the thermal runaway state and the second hydrogen content information according to a correspondence between the thermal runaway state and the first hydrogen content information and a correspondence between the second hydrogen content information and the first hydrogen content information;

[0178] A first state detection strategy construction submodule, configured to construct a first state detection strategy according to a correspondence between the thermal runaway state and the second hydrogen content information;

[0179] The state detection strategy construction submodule is used to construct the state detection strategy according to the first state detection strategy.

[0180] In an exemplary embodiment, the state detection strategy construction submodule may include:

[0181] An early fault state and a third hydrogen content information correspondence acquisition unit, used to acquire the third hydrogen content information generated by the preset lithium battery pack in the early fault state, and obtain the correspondence between the early fault state and the third hydrogen content information;

[0182] a corresponding relationship obtaining unit for the second hydrogen content information and the third hydrogen content information, configured to obtain a corresponding relationship between the second hydrogen content information and the third hydrogen content information according to the third hydrogen content information, the first capacity, and the second capacity;

[0183] an early fault state and a second hydrogen content information correspondence acquisition unit, configured to determine a correspondence between the early fault state and the second hydrogen content information according to a correspondence between the early fault state and the second hydrogen content information and a correspondence between the second hydrogen content information and the third hydrogen content information;

[0184] A second state detection strategy acquisition unit, configured to construct a second state detection strategy according to a correspondence between the early fault state and the second hydrogen content information;

[0185] A state detection strategy acquisition unit is used to construct the state detection strategy according to the first state detection strategy and the second state detection strategy.

[0186] In an exemplary embodiment, the state detection strategy acquisition unit may include:

[0187] A subunit for obtaining a correspondence between a health state and the fourth hydrogen content information, configured to obtain the fourth hydrogen content information generated by the preset lithium battery pack in a healthy state, and obtain a correspondence between the health state and the fourth hydrogen content information;

[0188] a subunit for obtaining a correspondence relationship between the second hydrogen content information and the fourth hydrogen content information, configured to obtain a correspondence relationship between the second hydrogen content information and the fourth hydrogen content information according to the fourth hydrogen content information, the first capacity, and the second capacity;

[0189] a health status and second hydrogen content information correspondence relationship acquisition subunit, configured to determine the correspondence relationship between the health status and the second hydrogen content information according to the correspondence relationship between the health status and the fourth hydrogen content information and the correspondence relationship between the second hydrogen content information and the fourth hydrogen content information;

[0190] A third state detection strategy construction subunit, configured to construct a third state detection strategy according to a correspondence between the health state and the second hydrogen content information;

[0191] The state detection strategy construction subunit is used to construct the state detection strategy according to the first state detection strategy, the second state detection strategy, and the third state detection strategy.

[0192] In an exemplary embodiment, the target concentration interval determination module 1020 may include:

[0193] A first preset concentration interval determination submodule, configured to determine, when the real-time hydrogen concentration is less than a first preset concentration threshold, a target concentration interval corresponding to the real-time hydrogen concentration as the first preset concentration interval;

[0194] a second preset concentration interval determination submodule, configured to determine, when the real-time hydrogen concentration is greater than the first preset concentration threshold and less than a second preset concentration threshold, that the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval;

[0195] a third preset concentration interval determination submodule, configured to determine, when the real-time hydrogen concentration is greater than or equal to the second preset concentration threshold and less than a third preset concentration threshold, that the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval;

[0196] The first preset concentration threshold is smaller than the second preset concentration threshold, and the second preset concentration threshold is smaller than the third preset concentration threshold.

[0197] In an exemplary embodiment, the target adjustment coefficient range acquisition module 1030 may include:

[0198] A search submodule, used to search a preset adjustment coefficient range matching the target concentration range in a preset adjustment coefficient database;

[0199] A first target adjustment coefficient range determination submodule, configured to determine the target adjustment coefficient range corresponding to the real-time hydrogen concentration as the first target adjustment coefficient range when the target concentration range corresponding to the real-time hydrogen concentration is the first preset concentration range;

[0200] A second target adjustment coefficient range determination submodule, configured to determine the target adjustment coefficient range corresponding to the real-time hydrogen concentration as the second target adjustment coefficient range when the target concentration range corresponding to the real-time hydrogen concentration is the second preset concentration range;

[0201] A third target adjustment coefficient range determination submodule, configured to determine that the target adjustment coefficient range corresponding to the real-time hydrogen concentration is a third target adjustment coefficient range when the target concentration range corresponding to the real-time hydrogen concentration is the third preset concentration range;

[0202] Among them, the first target adjustment coefficient range is smaller than the second target adjustment coefficient range, and the second target adjustment coefficient range is smaller than the third target adjustment coefficient range.

[0203] In an exemplary embodiment, the current state determination module 1060 may include:

[0204] A current state determination submodule, used to determine the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy;

[0205] The first prompt information generating submodule is used to generate the first prompt information when the current state indicates that the target lithium battery pack is in the thermal runaway state.

[0206] In an exemplary embodiment, the apparatus may further include:

[0207] A hydrogen concentration rising rate determination module, used to obtain the hydrogen concentration information of the target lithium battery pack within a preset period of time, and determine the hydrogen concentration rising rate of the target lithium battery pack;

[0208] The state determination module is used to determine the current state of the target lithium battery pack according to the hydrogen concentration rising rate and a preset rate threshold.

[0209] In an exemplary embodiment, the state determination module may include:

[0210] A first state determination submodule, configured to determine that the current state of the target lithium battery pack is a healthy state when the hydrogen concentration rising rate is less than a first preset rate threshold;

[0211] a second state determination submodule, configured to determine that the current state of the target lithium battery pack is a coolant leakage state when the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than a second preset rate threshold;

[0212] A third state determination submodule, configured to determine that the current state of the target lithium battery pack is the thermal runaway state when the hydrogen concentration rising rate is greater than or equal to the second preset rate threshold;

[0213] The first preset rate threshold is smaller than the second preset rate threshold.

[0214] The device and method embodiments in the device embodiments described above are based on the same inventive concept.

[0215] An embodiment of the present specification provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement a method for detecting a thermal runaway state of a lithium battery pack as provided in the above method embodiment.

[0216] An embodiment of the present application also provides a computer-readable storage medium, which can be set in a terminal to store at least one instruction or at least one program related to the method for detecting a thermal runaway state of a lithium battery pack in a method embodiment. The at least one instruction or at least one program is loaded and executed by the processor to implement the method for detecting a thermal runaway state of a lithium battery pack provided in the above method embodiment.

[0217] The embodiment of the present application also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes to implement the method for detecting the thermal runaway state of the lithium battery pack provided in the above method embodiment.

[0218] Optionally, in the embodiments of this specification, the storage medium may be located in at least one of the multiple network servers of the computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store program codes.

[0219] The memory described in the embodiments of this specification can be used to store software programs and modules, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, application programs required for functions, etc.; the data storage area may store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory may also include a memory controller to provide the processor with access to the memory.

[0220] The method for detecting the thermal runaway state of a lithium battery pack provided in the embodiments of this specification can be executed in a mobile terminal, a computer terminal, a server or a similar computing device. Taking running on a server as an example, Fig.11 1 is a hardware structure block diagram of a server for a method for detecting a thermal runaway state of a lithium battery pack provided in an embodiment of this specification. Fig.11 As shown, the server 1100 may have relatively large differences due to different configurations or performances, and may include one or more central processing units (CPU) 1110 (the central processing unit 1110 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 1130 for storing data, and one or more storage media 1120 (such as one or more mass storage devices) for storing application programs 1123 or data 1122. Among them, the memory 1130 and the storage medium 1120 can be short-term storage or permanent storage. The program stored in the storage medium 1120 may include one or more modules, each of which may include a series of instruction operations on the server. Furthermore, the central processing unit 1110 can be configured to communicate with the storage medium 1120 and execute a series of instruction operations in the storage medium 1120 on the server 1100. The server 1100 may also include one or more power supplies 1160, one or more wired or wireless network interfaces 1150, one or more input and output interfaces 1140, and / or one or more operating systems 1121, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0221] The input / output interface 1140 may be used to receive or send data via a network. The specific example of the network may include a wireless network provided by a communication provider of the server 1100. In one example, the input / output interface 1140 includes a network adapter (Network Interface Controller, NIC), which may be connected to other network devices via a base station so as to communicate with the Internet. In one example, the input / output interface 1140 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0222] It can be understood by those skilled in the art that Fig.11 The structure shown is only for illustration and does not limit the structure of the above electronic device. Fig.11 More or fewer components as shown, or with Fig.11 Different configurations are shown.

[0223] It can be seen from the embodiments of the detection method and device for the thermal runaway state of the lithium battery pack provided by the present application that the present application constructs a state detection strategy for the target lithium battery pack in the vehicle; obtains the real-time hydrogen concentration of the target lithium battery pack, and determines the target concentration interval corresponding to the real-time hydrogen concentration according to the preset concentration threshold; searches for the preset adjustment coefficient range matching the target concentration interval in the preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes the corresponding relationship between the preset concentration interval and the preset adjustment coefficient range; according to the target model information of the vehicle, searches for the adjustment coefficient corresponding to the target model information in the target adjustment coefficient range to obtain the target adjustment coefficient corresponding to the real-time hydrogen concentration; adjusts the real-time hydrogen concentration according to the target adjustment coefficient to obtain the adjusted hydrogen concentration; determines the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state characterizes whether the target lithium battery pack is in a thermal runaway state. The present application can timely and accurately obtain the state of the lithium battery pack by detecting the hydrogen concentration. Compared with the temperature or pressure detection method, it has a faster response speed and a higher accuracy, and is suitable for early warning of thermal runaway to ensure higher safety.

[0224] It should be noted that the above sequence of the embodiments of this specification is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0225] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0226] A person skilled in the art will appreciate that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0227] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for detecting thermal runaway of a lithium battery pack, characterized in that: The method comprises: Construct a status detection strategy for the target lithium battery pack in the vehicle; Obtaining the real-time hydrogen concentration of the target lithium battery pack, and determining a target concentration range corresponding to the real-time hydrogen concentration according to a preset concentration threshold; Searching a preset adjustment coefficient range matching the target concentration interval in a preset adjustment coefficient database to obtain a target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between a preset concentration interval and a preset adjustment coefficient range; According to the target model information of the vehicle, searching for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range to obtain a target adjustment coefficient corresponding to the real-time hydrogen concentration; Adjusting the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration; According to the adjusted hydrogen concentration and the state detection strategy, the current state of the target lithium battery pack is determined; the current state indicates whether the target lithium battery pack is in a thermal runaway state.

2. The method according to claim 1, characterized in that The method of constructing a state detection strategy for a target lithium battery pack in a vehicle includes: Acquire first hydrogen content information generated by a preset lithium battery pack in a thermal runaway state, and obtain a corresponding relationship between the thermal runaway state and the first hydrogen content information; the preset lithium battery pack is a lithium battery pack with the same model as the target lithium battery pack but a different battery capacity; According to the first hydrogen content information, the first capacity of the preset lithium battery pack, and the second capacity of the target lithium battery pack, a corresponding relationship between the second hydrogen content information and the first hydrogen content information is obtained; the second hydrogen content information is the hydrogen content information of the target lithium battery pack; the first capacity is less than the second capacity; Determining a correspondence relationship between the thermal runaway state and the second hydrogen content information according to a correspondence relationship between the thermal runaway state and the first hydrogen content information and a correspondence relationship between the second hydrogen content information and the first hydrogen content information; Constructing a first state detection strategy according to the correspondence between the thermal runaway state and the second hydrogen content information; The state detection strategy is constructed according to the first state detection strategy.

3. The method according to claim 2, characterized in that The step of constructing the state detection strategy according to the first state detection strategy includes: Acquire third hydrogen content information generated by the preset lithium battery pack in an early fault state, and obtain a corresponding relationship between the early fault state and the third hydrogen content information; Obtaining a correspondence between the second hydrogen content information and the third hydrogen content information according to the third hydrogen content information, the first capacity, and the second capacity; Determining a correspondence relationship between the early fault state and the second hydrogen content information according to a correspondence relationship between the early fault state and the second hydrogen content information and a correspondence relationship between the second hydrogen content information and the third hydrogen content information; Constructing a second state detection strategy according to the correspondence between the early fault state and the second hydrogen content information; The state detection strategy is constructed according to the first state detection strategy and the second state detection strategy.

4. The method according to claim 3, characterized in that The constructing the state detection strategy according to the first state detection strategy and the second state detection strategy includes: Acquire fourth hydrogen content information generated by the preset lithium battery pack in a healthy state, and obtain a corresponding relationship between the healthy state and the fourth hydrogen content information; Obtaining a correspondence between the second hydrogen content information and the fourth hydrogen content information according to the fourth hydrogen content information, the first capacity, and the second capacity; determining a correspondence between the health status and the second hydrogen content information according to a correspondence between the health status and the fourth hydrogen content information and a correspondence between the second hydrogen content information and the fourth hydrogen content information; constructing a third state detection strategy according to the correspondence between the health state and the second hydrogen content information; The state detection strategy is constructed according to the first state detection strategy, the second state detection strategy, and the third state detection strategy.

5. The method according to claim 1, characterized in that The obtaining of the real-time hydrogen concentration of the target lithium battery pack and determining the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold value includes: When the real-time hydrogen concentration is less than a first preset concentration threshold, determining the target concentration interval corresponding to the real-time hydrogen concentration to be the first preset concentration interval; When the real-time hydrogen concentration is greater than the first preset concentration threshold and less than the second preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval; When the real-time hydrogen concentration is greater than or equal to the second preset concentration threshold and less than a third preset concentration threshold, determining that the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval; The first preset concentration threshold is smaller than the second preset concentration threshold, and the second preset concentration threshold is smaller than the third preset concentration threshold.

6. The method according to claim 5, characterized in that The step of searching a preset adjustment coefficient database for a preset adjustment coefficient range that matches the target concentration interval to obtain a target adjustment coefficient range corresponding to the real-time hydrogen concentration includes: Searching a preset adjustment coefficient database for a preset adjustment coefficient range that matches the target concentration range; When the target concentration interval corresponding to the real-time hydrogen concentration is the first preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the first target adjustment coefficient range; When the target concentration interval corresponding to the real-time hydrogen concentration is the second preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the second target adjustment coefficient range; When the target concentration interval corresponding to the real-time hydrogen concentration is the third preset concentration interval, determining the target adjustment coefficient range corresponding to the real-time hydrogen concentration to be the third target adjustment coefficient range; Among them, the first target adjustment coefficient range is smaller than the second target adjustment coefficient range, and the second target adjustment coefficient range is smaller than the third target adjustment coefficient range.

7. The method according to claim 1, characterized in that The determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy includes: Determining the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; When the current state indicates that the target lithium battery pack is in the thermal runaway state, a first prompt message is generated.

8. The method according to claim 1, characterized in that The method further comprises: Acquire hydrogen concentration information of the target lithium battery pack within a preset period of time, and determine the hydrogen concentration rising rate of the target lithium battery pack; The current state of the target lithium battery pack is determined according to the hydrogen concentration rising rate and a preset rate threshold.

9. The method according to claim 8, characterized in that The determining the current state of the target lithium battery pack according to the hydrogen concentration rising rate and a preset rate threshold comprises: When the hydrogen concentration rising rate is less than a first preset rate threshold, determining that the current state of the target lithium battery pack is a healthy state; When the hydrogen concentration rising rate is greater than or equal to the first preset rate threshold and less than the second preset rate threshold, determining that the current state of the target lithium battery pack is a coolant leakage state; When the hydrogen concentration rising rate is greater than or equal to the second preset rate threshold, determining that the current state of the target lithium battery pack is the thermal runaway state; The first preset rate threshold is smaller than the second preset rate threshold.

10. A device for detecting thermal runaway of a lithium battery pack, characterized in that: The device comprises: A state detection strategy building module is used to build a state detection strategy for a target lithium battery pack in a vehicle; A target concentration interval determination module, used to obtain the real-time hydrogen concentration of the target lithium battery pack, and determine the target concentration interval corresponding to the real-time hydrogen concentration according to a preset concentration threshold; a target adjustment coefficient range acquisition module, used to search a preset adjustment coefficient range matching the target concentration interval in a preset adjustment coefficient database to obtain the target adjustment coefficient range corresponding to the real-time hydrogen concentration; the preset adjustment coefficient database includes a correspondence between a preset concentration interval and a preset adjustment coefficient range; a target adjustment coefficient acquisition module, configured to search for an adjustment coefficient corresponding to the target model information within the target adjustment coefficient range according to the target model information of the vehicle, and obtain the target adjustment coefficient corresponding to the real-time hydrogen concentration; An adjusted hydrogen concentration acquisition module is used to adjust the real-time hydrogen concentration according to the target adjustment coefficient to obtain an adjusted hydrogen concentration; The current state determination module is used to determine the current state of the target lithium battery pack according to the adjusted hydrogen concentration and the state detection strategy; the current state indicates whether the target lithium battery pack is in a thermal runaway state.

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