Battery cell thermal runaway early warning method and device, storage medium, program product and vehicle

Abstract

The application discloses a kind of electric core thermal runaway early warning method, device, storage medium, program product and vehicle, it is related to battery technology field, the method is applied to the battery system including multiple battery modules, battery module includes multiple electric cores, daisy chain communication is used between battery module, the method includes: obtaining the electric core state data of electric core and the communication state data between battery module, communication state data is determined by daisy chain communication;Determine whether electric core state data and communication state data meet preset thermal runaway condition;If it is met, thermal runaway early warning is carried out to battery system.Due to the application, not only electric core state data is collected, but also the communication state data of daisy chain communication between battery module is monitored in real time, so that whether battery system meets preset thermal runaway condition can be comprehensively judged, the single condition that traditional battery management system is avoided to voltage and temperature is alarmed, so as to improve the accuracy and timeliness of battery thermal runaway event early warning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell thermal runaway early warning method and device, storage medium, program product and vehicle. BACKGROUND

[0002] New energy vehicles, as a strategic emerging technology industry, can alleviate energy shortage and environmental pollution problems, among which, the electrification of vehicle power system gradually becomes one of the main trends of future vehicle technology development. The main feature of the electrification of vehicle power system is to use electric energy instead of chemical energy as the main driving energy source of vehicle. Because lithium ion power battery has the characteristics of high specific energy, low self-discharge rate and long cycle life, it is often used as the energy source of pure electric vehicles.

[0003] However, lithium ion battery is a chemical power supply with poor stability. In the case of external abuse or manufacturing defects, thermal runaway may occur, resulting in serious personal and property losses. In the case that thermal runaway cannot be completely avoided, early warning of thermal runaway is particularly important. The traditional battery management system generally alarms the voltage and temperature, but these alarm items are usually difficult to effectively warn thermal runaway when the battery fails.

[0004] The above content is only used to assist in understanding the technical solutions of the present application, and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide a battery cell thermal runaway early warning method, device, storage medium, program product and vehicle, which aims to solve the technical problem that the traditional battery management system generally alarms the voltage and temperature, but it is difficult to effectively warn thermal runaway when the battery fails.

[0006] To achieve the above purpose, the present application provides a battery cell thermal runaway early warning method, which is applied to a battery system comprising a plurality of battery modules, the battery module comprises a plurality of battery cells, the battery modules adopt daisy chain communication, and the method comprises:

[0007] Obtain the battery cell state data of the battery cell in the battery system and the communication state data between the battery modules, wherein the communication state data is determined by the daisy chain communication;

[0008] Determine whether the battery cell state data and the communication state data meet the preset thermal runaway condition;

[0009] If the preset thermal runaway condition is met, the battery system is warned of thermal runaway.

[0010] In an embodiment, the cell status data comprises a cell temperature, a temperature change rate and a temperature time value of the cell, the preset thermal runaway condition comprises a first thermal runaway condition, and the first thermal runaway condition comprises: the cell temperature reaching a preset temperature extreme value; and the temperature change rate reaching a preset temperature rise rate; and the temperature time value meeting a preset time condition.

[0011] If the preset thermal runaway condition is met, the step of performing thermal runaway warning on the battery system comprises:

[0012] When the cell temperature, the temperature change rate and the temperature time value meet the first thermal runaway condition, it is determined that the battery system is in a thermal runaway state, and thermal runaway warning is performed.

[0013] In an embodiment, the cell status data further comprises a cell voltage and a voltage time value of the cell, the preset thermal runaway condition further comprises a second thermal runaway condition, and the second thermal runaway condition comprises: the cell voltage reaching a preset voltage extreme value; and the temperature change rate reaching the preset temperature rise rate; and the voltage time value and the temperature time value meeting the preset time condition.

[0014] If the preset thermal runaway condition is met, the step of performing thermal runaway warning on the battery system comprises:

[0015] When the cell voltage, the voltage time, the temperature change rate and the temperature time value meet the second thermal runaway condition, it is determined that the battery system is in a thermal runaway state, and thermal runaway warning is performed.

[0016] In an embodiment, the cell status data further comprises a temperature sampling invalid time of the cell, the preset thermal runaway condition further comprises a third thermal runaway condition, and the third thermal runaway condition comprises: the cell temperature reaching the preset temperature extreme value; and the temperature time value and the temperature sampling invalid time meeting the preset time condition.

[0017] If the preset thermal runaway condition is met, the step of performing thermal runaway warning on the battery system comprises:

[0018] When the cell temperature, the temperature sampling invalid time and the temperature time value meet the third thermal runaway condition, it is determined that the battery system is in a thermal runaway state, and thermal runaway warning is performed.

[0019] In an embodiment, the communication status data comprises a daisy chain communication failure and a failure time value; the preset thermal runaway condition further comprises a fourth thermal runaway condition, and the fourth thermal runaway condition comprises: the cell temperature reaching the preset temperature extreme value; and the failure time value meeting the preset time condition.

[0020] The step of performing thermal runaway early warning on the battery system if the preset thermal runaway condition is met includes:

[0021] When the cell temperature, the daisy chain communication failure and the failure time value meet the fourth thermal runaway condition, it is determined that the battery system is in a thermal runaway state, and thermal runaway early warning is performed.

[0022] In an embodiment, the step of performing thermal runaway early warning on the battery system if the preset thermal runaway condition is met further includes:

[0023] After performing thermal runaway early warning, a high-voltage power-down instruction is generated.

[0024] The high-voltage relay of the vehicle is controlled to be disconnected according to the high-voltage power-down instruction.

[0025] In addition, to achieve the above-mentioned purpose, the present application also provides a cell thermal runaway early warning device, which is applied to a battery system including a plurality of battery modules, the battery modules include a plurality of cells, and the battery modules use daisy chain communication. The device includes:

[0026] A data acquisition module is configured to acquire cell state data of the cells in the battery system and communication state data between the battery modules, wherein the communication state data is determined by the daisy chain communication.

[0027] A condition judgment module is configured to judge whether the cell state data and the communication state data meet a preset thermal runaway condition.

[0028] A thermal runaway early warning module is configured to perform thermal runaway early warning on the battery system if the preset thermal runaway condition is met.

[0029] In addition, to achieve the above-mentioned purpose, the present application also provides a storage medium, which is a computer readable storage medium, and a computer program is stored on the storage medium. The computer program is executed by a processor to implement the steps of the cell thermal runaway early warning method as described above.

[0030] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. The computer program is executed by a processor to implement the steps of the cell thermal runaway early warning method as described above.

[0031] In addition, to achieve the above-mentioned purpose, the present application also provides a vehicle, which performs the steps of the cell thermal runaway early warning method as described above.

[0032] The one or more technical solutions provided in the application have at least the following technical effects: The application is applied to a battery system including a plurality of battery modules, the battery modules include a plurality of battery cells, daisy chain communication is used between the battery modules, battery cell state data of the battery cells in the battery system and communication state data between the battery modules are acquired first, the communication state data is determined by the daisy chain communication; then it is judged whether the battery cell state data and the communication state data meet a preset thermal runaway condition; if the preset thermal runaway condition is met, a thermal runaway warning is performed on the battery system. Since the application not only collects battery cell state data of the battery cells, but also monitors communication state data of the daisy chain communication between the battery modules in real time, whether the battery system meets the preset thermal runaway condition can be comprehensively monitored, the situation that a traditional battery management system performs single alarm on voltage and temperature is avoided, and the accuracy and timeliness of a thermal runaway event of the battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application together with the specification.

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the field, other drawings can also be obtained based on these drawings without creative labor.

[0035] Figure 1 A flowchart is provided for the battery cell thermal runaway warning method embodiment one of the application;

[0036] Figure 2 A battery system internal module and temperature sampling schematic diagram is provided for the embodiment one of the application;

[0037] Figure 3 A battery system internal module and voltage sampling schematic diagram is provided for the embodiment one of the application;

[0038] Figure 4 A flowchart is provided for the battery cell thermal runaway warning method embodiment two of the application;

[0039] Figure 5 A system thermal runaway judgment condition and logic diagram is provided for the embodiment two of the application;

[0040] Figure 6 A module structure schematic diagram of the battery cell thermal runaway warning device of the embodiment of the application is provided;

[0041] Figure 7A device structure schematic diagram of a hardware running environment involved in a cell thermal runaway early warning method in the embodiments of the present application.

[0042] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application, and are not used to limit the present application.

[0044] In order to better understand the technical solutions of the present application, the specific embodiments will be described in detail below with reference to the drawings and the specific embodiments.

[0045] The current battery management system only alarms for single change of voltage or temperature, and the alarm threshold is usually set large, which cannot effectively perform thermal runaway early warning. The present application not only judges through voltage, temperature and other information, but also real-time monitors and discriminates the failure phenomenon of the cell when thermal runaway occurs and the change in the process, and introduces daisy chain communication and other events, arranges and combines the process and phenomenon of thermal runaway such as different events, event and time relationship, generates different thermal runaway judgment conditions, greatly improves the accuracy and timeliness of the thermal runaway event, and improves the safety of personnel.

[0046] It should be noted that the execution subject of the present embodiment can be an electronic device with data acquisition and thermal runaway early warning function, such as a vehicle-mounted computer, a vehicle control unit (VCU), a battery management system, or an electronic device capable of realizing the above functions, a cell thermal runaway early warning device (referred to as early warning device) for executing the cell thermal runaway early warning method of the present application, etc. The present embodiment does not limit this. The present embodiment and the following embodiments will be described below taking the early warning device as an example.

[0047] Based on this, the present embodiment provides a cell thermal runaway early warning method, which is described in detail with reference to Figure 1 , Figure 1 A flowchart provided by the first embodiment of the cell thermal runaway early warning method of the present application.

[0048] In the present embodiment, the method is applied to a battery system including a plurality of battery modules, the battery modules include a plurality of cells, the battery modules use daisy chain communication, and the cell thermal runaway early warning method includes steps S10-S30.

[0049] Step S10: Obtain cell state data of the cells in the battery system and communication state data between the battery modules, the communication state data being determined by the daisy chain communication.

[0050] It should be noted that the embodiment is applied to a battery system, which can be referred to Figure 2 , Figure 2 The battery system provided in Embodiment One of the present application is internally provided with a module and a temperature sampling diagram. The battery system is composed of a plurality of battery cells (such as battery cell 1 to battery cell 6 shown in Figure 2 The FPC (Flexible Printed Circuit) temperature sampling line is used for temperature sampling. A temperature probe NTC is designed at the positive lug of the upper end cover of each battery cell for monitoring the real-time temperature information of each battery cell. The FPC lead is connected to the slave sampling board CMC for temperature detection of the NTC. An explosion-proof valve is arranged on each battery cell. When thermal runaway occurs in the battery cell, the internal temperature of the battery cell will rapidly rise, which will cause the explosion-proof valve to burst, thereby ensuring safety.

[0051] In addition, the battery system can be composed of a plurality of battery modules (such as module 1 and module 2 shown in Figure 3 , Figure 3 The battery system provided in Embodiment One of the present application is internally provided with a module and a voltage sampling diagram. The positive and negative lug of the upper end cover of each battery cell is led out by the FPC, and the CMC detection is completed by the voltage collection front end AFE (Analog front end) to collect the single battery voltage of each battery cell. The power supply of the AFE is provided by the module. The AFE (such as AFE 1 and AFE 2 shown in Figure 3 The internal daisy chain communication is used between the AFE, and the CAN communication is used between the main board BMU and the slave board CMC to send all the battery voltage information.

[0052] It should be noted that Figure 3 Two modules are taken as an example, and the number of modules is not limited in the embodiment. When the number of modules is greater than 2, the principle is equivalent to Figure 3 .

[0053] It should be noted that the battery cell state data is data reflecting various characteristics and conditions of the battery cell.

[0054] For example, the battery cell state data can include the voltage, current, temperature, internal resistance, discharge time, etc. of the battery cell. Through the battery cell state data, the running condition of the battery cell can be detected, and the safety of the battery system can be ensured.

[0055] It should be noted that the daisy chain communication is a device connection mode. In this mode, a plurality of slave boards CMC are connected in a linear manner, like the petals of a chrysanthemum, and the data signal is transmitted along the slave boards CMC one by one. The output of one slave board CMC is connected to the input of the next slave board CMC, and the information can be transmitted and exchanged between the slave boards CMC one by one, so as to realize the communication and interaction of data.

[0056] It should be noted that the communication state data is related data for describing the communication condition between the slave CMCs. For example, data such as signal strength, connection stability, transmission rate, delay time, packet loss rate, and bit error rate. Through the communication state data, the communication condition between the battery modules can be understood.

[0057] In an embodiment, the pre-warning device can first acquire the cell state data of the cells in the battery system and the communication state data between the battery modules, such as real-time information of the cells, daisy chain communication state, voltage of each single cell and the lowest voltage of the single cell, temperature of each module and the highest temperature, communication state between the master BMU and the slave CMC, and the like.

[0058] Step S20: determining whether the cell state data and the communication state data meet the preset thermal runaway condition.

[0059] It should be noted that the preset thermal runaway condition is a condition for judging whether the cell has thermal runaway, which is set in advance. Specifically, the data in the cell state data and the communication state data that appears in the thermal runaway condition can be arranged and combined to generate different thermal runaway judgment conditions. For example, the temperature is greater than the normal value, the duration is greater than 2S, and the temperature change is too large, which can be defined as the preset thermal runaway condition, and the system is determined to have thermal runaway at this time. It can also be other combinations, which are not limited in this embodiment.

[0060] Step S30: if the preset thermal runaway condition is met, the battery system is pre-warned of thermal runaway.

[0061] In this embodiment, the pre-warning device can first acquire the cell state data of the cells in the battery system and the communication state data between the battery modules, such as real-time information of the cells, daisy chain communication state, voltage of each single cell and the lowest voltage of the single cell, temperature of each module and the highest temperature, communication state between the master BMU and the slave CMC, and the like. Then, whether the cell state data and the communication state data meet the preset thermal runaway condition is determined. When the preset thermal runaway condition is met, the battery system is pre-warned of thermal runaway. By monitoring the communication state data of the daisy chain communication between the battery modules in real time, whether the battery system meets the preset thermal runaway condition is comprehensively monitored, avoiding the single alarm of the traditional battery management system on voltage and temperature, thereby improving the accuracy and timeliness of the thermal runaway event of the battery.

[0062] In a feasible embodiment, after step S30 of the present embodiment, a step of generating a high-voltage power-off instruction after pre-warning of thermal runaway can be included, and the high-voltage relay of the vehicle is controlled to be disconnected according to the high-voltage power-off instruction.

[0063] It should be noted that the high-voltage power-off instruction is an instruction for turning off the high-voltage power system of the vehicle after thermal runaway of the battery cell occurs, so as to avoid further spread of thermal runaway.

[0064] It should be noted that the high-voltage relay is a device for controlling the on-off of the circuit of the vehicle.

[0065] By opening the high-voltage relay, the circuit of the high-voltage part of the vehicle can be cut off, the transmission of high-voltage power is stopped, and the power-off state of the high-voltage system of the vehicle is realized. After thermal runaway of the battery cell occurs, personnel safety is ensured.

[0066] In this embodiment, after thermal runaway of the battery system occurs, a thermal runaway fault can be reported to the vehicle controller VCU and the instrument. After receiving the thermal runaway fault signal, the VCU sends a high-voltage power-off instruction to all high-voltage control units, and then immediately controls the high-voltage relay to open and cut off the high-voltage output of the vehicle. At the same time, after receiving the thermal runaway fault signal, the instrument immediately lights up the thermal runaway lamp and sends a fault alarm sound to inform personnel to evacuate as soon as possible.

[0067] The embodiment provides a battery cell thermal runaway early warning method. A warning device can first acquire battery cell state data of battery cells in a battery system and communication state data between battery modules, such as real-time information of the battery cells, daisy chain communication states, voltages of each single battery cell and the lowest voltage of the single battery cell, temperatures of each module and the highest temperature, communication states between a main board BMU and a slave board CMC, and the like. Then, whether the preset thermal runaway condition is met is determined according to the battery cell state data and the communication state data. When the preset thermal runaway condition is met, the battery system is subjected to thermal runaway early warning. Since the embodiment not only collects the battery cell state data of the battery cells, but also monitors the communication state data of the daisy chain communication between the battery modules in real time, different events, relationships between events and time, and processes and phenomena of thermal runaway are arranged and combined to generate different thermal runaway judgment conditions. Therefore, whether the battery system meets the preset thermal runaway condition can be comprehensively monitored, the condition that the traditional battery management system only alarms the voltage and the temperature is avoided, and the accuracy and timeliness of the thermal runaway event of the battery are improved.

[0068] Based on the first embodiment of the present application, in the second embodiment of the battery cell thermal runaway early warning method of the present application, the same or similar contents as the above-mentioned first embodiment can be referred to the above description, and will not be described in detail. On this basis, please refer to Figure 4 , Figure 4 for the flowchart of the second embodiment of the battery cell thermal runaway early warning method of the present application.

[0069] The cell state data in the embodiment includes a cell temperature, a temperature change rate and a temperature time value of the cell, and the preset thermal runaway condition includes a first thermal runaway condition, the first thermal runaway condition includes that the cell temperature reaches a preset temperature extreme value, the temperature change rate reaches a preset temperature rise rate, and the temperature time value meets a preset time condition.

[0070] Correspondingly, the step S30 in the embodiment includes a step S31 of determining that the battery system is in a thermal runaway state and performing a thermal runaway warning when the cell temperature, the temperature change rate and the temperature time value meet the first thermal runaway condition.

[0071] It should be noted that the cell temperature is the temperature of the battery cell itself. The temperature change rate is the rate of increase or decrease of the cell temperature within a certain time, which reflects the speed of temperature change. The temperature time value is the maintenance time of the temperature change rate of the cell temperature.

[0072] It should be noted that the preset temperature extreme value is a highest temperature limit value that the cell is allowed to reach, for example, about 60°C, which can be set according to actual conditions, and the embodiment does not limit this. The preset temperature rise rate is a preset speed limit of temperature rise. The preset time condition is a limit of the length of time of maintenance of the cell temperature, the temperature change rate, the voltage change and the like.

[0073] In the embodiment, for the convenience of understanding, reference is made to Figure 5 , Figure 5 The system thermal runaway judgment condition and the logic diagram provided for the second embodiment of the application. According to the temperature characteristics of the cell under normal conditions, the preset temperature extreme value of the thermal runaway can be set as Tmax, and the preset temperature rise rate can be set as α max . It is assumed that the temperature of the battery module at the initial moment is T0, the temperature at any moment is Tn, the temperature single update rate of the BMU is T, and the temperature change rate calculated by the BMU within a unit time is:

[0074] α = d (Tn-T0) / T;

[0075] At this time, event 1 can be defined as that the temperature extreme value of the cell temperature is >=Tmax and the duration tmax>2S;

[0076] Event 2 is defined as that the temperature change rate has a rise speed >=α max and the duration tα>3S;

[0077] When event 1 and event 2 occur and the time difference between them is Δt<5min, the first thermal runaway condition (i.e., thermal runaway condition 1) is met, and it can be determined that the system has a thermal runaway.

[0078] In an embodiment, the cell state data further comprises a cell voltage and a voltage time value of the cell, and the preset thermal runaway condition further comprises a second thermal runaway condition, the second thermal runaway condition comprising: the cell voltage reaching a preset voltage limit; the temperature rate of change reaching the preset temperature rate of rise; and the voltage time value and the temperature time value satisfying the preset time condition.

[0079] The step S30 comprises: when the cell voltage, the voltage time, the temperature rate of change and the temperature time value satisfy the second thermal runaway condition, determining that the battery system is in a thermal runaway state, and performing a thermal runaway warning.

[0080] It should be noted that the cell voltage is the potential difference between the two poles of the cell, which reflects the state of the stored electrical energy of the cell. The preset voltage limit is a pre-set limit value of the maximum voltage that the cell is allowed to reach, for example, 800V, which can be set according to actual conditions, and the present embodiment does not limit it. The voltage time value is the time for which the cell voltage is maintained at the limit value of the maximum voltage.

[0081] In the present embodiment, for the convenience of understanding, as shown in Figure 5 The preset voltage limit of the thermal runaway can be set to V0 according to the voltage and temperature characteristics of the cell under normal conditions.

[0082] At this time, event 3 can be defined as: the voltage limit of the cell voltage ≦ V0 and the duration tmax > 2S;

[0083] When event 2 and event 3 occur and the time difference Δt between them is < 5min, the second thermal runaway condition (i.e. thermal runaway condition 2) is satisfied, and it can be determined that the system has a thermal runaway.

[0084] In another embodiment, the cell state data further comprises a temperature sampling invalid time of the cell, and the preset thermal runaway condition further comprises a third thermal runaway condition, the third thermal runaway condition comprising: the cell temperature reaching the preset temperature limit; and the temperature time value and the temperature sampling invalid time satisfying the preset time condition.

[0085] Correspondingly, the step S30 comprises: when the cell temperature, the temperature sampling invalid time and the temperature time value satisfy the third thermal runaway condition, determining that the battery system is in a thermal runaway state, and performing a thermal runaway warning.

[0086] It should be noted that, as shown in Figure 3As shown, when the battery cell has thermal runaway, the temperature inside the battery cell rises sharply, causing the explosion of the battery cell explosion valve. At this time, the CMC temperature sampling line will be disconnected under the impact of the explosion of the battery cell, and the temperature detection value of the CMC is 65535 (i.e. invalid), and the CMC reports the temperature sampling invalid value Ti.

[0087] It should be noted that the temperature sampling invalid time is the duration of the temperature invalid value Ti.

[0088] In this embodiment, for ease of understanding, as shown in Figure 5 As shown. According to the temperature characteristics and temperature sampling characteristics of the battery cell under normal conditions, event 4: the duration of the temperature sampling invalid value tmax> 2S can be defined.

[0089] When event 1 and event 4 occur and the time difference At between them is less than 25 minutes, the third thermal runaway condition (i.e. thermal runaway condition 3) is met, and it can be determined that the system has thermal runaway.

[0090] In another possible implementation, the communication state data described in the embodiment includes a daisy chain communication failure and a failure time value; and the preset thermal runaway condition further includes a fourth thermal runaway condition, the fourth thermal runaway condition includes: the battery cell temperature reaches the preset temperature extreme value; and the failure time value meets the preset time condition.

[0091] Correspondingly, the step S30 includes: when the battery cell temperature, the daisy chain communication failure and the failure time value meet the fourth thermal runaway condition, determining that the battery system is in a thermal runaway state, and performing thermal runaway warning.

[0092] It should be noted that, according to the voltage characteristics of the power battery under normal conditions and the AFE sampling principle, as shown in Figure 3 As shown, when the battery cell in module 2 has thermal runaway, the temperature inside the battery cell rises sharply and the battery cell explosion valve will explode. At this time, the FPC voltage sampling line in module 2 will be disconnected under the impact of the explosion of the battery cell, the power supply of AFE2 will be disconnected, AFE2 cannot work normally, the daisy chain communication between AFE1 and AFE2 is disconnected, and CMC reports the daisy chain communication failure to BMU.

[0093] It should be noted that the failure time value is the duration of the daisy chain communication failure.

[0094] In this embodiment, for ease of understanding, as shown in Figure 5 As shown. According to the voltage characteristics of the power battery under normal conditions and the AFE sampling principle, event 5: daisy chain communication failure and failure duration> 2S can be defined.

[0095] When event 1 and event 5 occur and the time difference between the two is less than 25 min, the fourth thermal runaway condition (i.e., thermal runaway condition 4) is met, and it can be determined that the system has a thermal runaway.

[0096] It should be noted that any one of the above thermal runaway condition 1, thermal runaway condition 2, thermal runaway condition 3, and thermal runaway condition 4 meets the condition, and the system determines that a thermal runaway occurs.

[0097] It should be noted that the above time setting is only an example, and the time can also be set according to the actual situation, which is not limited in the embodiment.

[0098] The embodiment considers that the current battery management system only alarms a single condition of voltage or temperature, and the alarm threshold is usually set to be large, which cannot effectively perform thermal runaway early warning. The embodiment not only judges through the information such as cell temperature, temperature change rate, temperature time value, cell voltage, voltage time value, and invalid temperature sampling time, but also monitors and identifies the failure phenomenon of the cell when the thermal runaway occurs and the change in the process in real time, and introduces a daisy chain communication event. Different events, event and time relationship, and thermal runaway processes and phenomena are arranged and combined to generate different thermal runaway judgment conditions, which greatly improves the accuracy and timeliness of the thermal runaway event and improves the safety of personnel.

[0099] It should be noted that the above example is only used to understand the present application and does not constitute a limitation on the cell thermal runaway early warning method of the present application. Based on this technical concept, more forms of simple transformation are within the protection scope of the present application.

[0100] The present application also provides a cell thermal runaway early warning device, which is described in detail in the present application. Figure 6 , Figure 6 The present application also provides a cell thermal runaway early warning device, which is described in the present application.

[0101] The data acquisition module 601 is configured to acquire cell state data of the cell in the battery system and communication state data between the battery modules, and the communication state data is determined by the daisy chain communication.

[0102] The condition judgment module 602 is configured to judge whether the cell state data and the communication state data meet a preset thermal runaway condition.

[0103] The thermal runaway early warning module 603 is configured to perform thermal runaway early warning on the battery system if the preset thermal runaway condition is met.

[0104] The application provides an electric core thermal runaway early warning device, adopts the electric core thermal runaway early warning method in the above embodiment, and can solve the technical problem that the traditional battery management system generally alarms voltage and temperature, but it is difficult to effectively perform thermal runaway early warning in the case of battery failure. Compared with the prior art, the electric core thermal runaway early warning device provided by the application has the same beneficial effects as the electric core thermal runaway early warning method provided by the above embodiment, and other technical features in the electric core thermal runaway early warning device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0105] The application provides a vehicle configured with an electric core thermal runaway early warning device or apparatus, which performs the steps of realizing the electric core thermal runaway early warning method as described above.

[0106] The electric core thermal runaway early warning device comprises at least one processor and a memory in communication connection with the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the electric core thermal runaway early warning method in the above embodiment one.

[0107] Reference will be made to the accompanying drawings below Figure 7 , Figure 7 The device structure diagram of the hardware running environment involved in the electric core thermal runaway early warning method in the embodiments of the application is shown, which shows the structure diagram of the electric core thermal runaway early warning device suitable for realizing the embodiments of the application. The electric core thermal runaway early warning device in the embodiments of the application can include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistant), PADs (Portable Application Description), PMPs (Portable Media Player), vehicle-mounted terminals (such as vehicle-mounted navigation terminals) and the like, and fixed terminals such as digital TVs, desktop computers and the like. Figure 7 The electric core thermal runaway early warning device shown is only an example, and should not bring any limitation to the functions and use range of the embodiments of the application.

[0108] As Figure 7As shown, the battery cell thermal runaway early warning device can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 1002 or loaded from a storage device 1003 into a random access memory (RAM) 1004. Various programs and data required for operation of the battery cell thermal runaway early warning device are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the battery cell thermal runaway early warning device to communicate with other devices wirelessly or by wire to exchange data. Although the battery cell thermal runaway early warning device with various systems is shown in the figure, it should be understood that all the systems shown are not required to be implemented or possessed. More or fewer systems can be alternatively implemented or possessed.

[0109] In particular, according to embodiments of the present disclosure, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by a communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments of the present disclosure are performed.

[0110] The battery cell thermal runaway early warning device provided by the present disclosure adopts the battery cell thermal runaway early warning method in the above embodiments, and can solve the technical problem that the conventional battery management system generally alarms voltage and temperature, but is difficult to effectively perform thermal runaway early warning in the event of battery failure. Compared with the prior art, the battery cell thermal runaway early warning device provided by the present disclosure has the same beneficial effects as the battery cell thermal runaway early warning method provided by the above embodiments, and other technical features in the battery cell thermal runaway early warning device are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0111] It should be understood that various aspects of the disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0112] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Any variations and modifications that can be made by any person skilled in the art within the spirit and scope of the application are intended to be encompassed by the application. The scope of the application is defined by the appended claims.

[0113] The application provides a computer readable storage medium having computer readable program instructions (i.e., computer programs) stored thereon, the computer readable program instructions being used to execute the cell thermal runaway early warning method in the above embodiments.

[0114] The computer readable storage medium provided by the application may, for example, be a U disk, but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any appropriate combination thereof. In the present embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer readable storage medium can be transmitted by any appropriate medium, including but not limited to an electrical wire, an optical cable, an RF (Radio Frequency), etc., or any appropriate combination thereof.

[0115] The above computer readable storage medium can be included in the cell thermal runaway early warning device; or can exist separately and not be assembled into the cell thermal runaway early warning device.

[0116] The computer readable storage medium described above carries one or more programs, when the one or more programs are executed by the battery cell thermal runaway early warning device, the battery cell thermal runaway early warning device: obtains the cell state data of the battery cell in the battery system and the communication state data between the battery modules, the communication state data is determined by the daisy chain communication; determine whether the cell state data and the communication state data meet the preset thermal runaway condition; if the preset thermal runaway condition is met, the battery system is warned of thermal runaway.

[0117] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0118] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of present application. In this regard, each block in the flow diagrams or block diagrams can represent a module, a procedure, or a part of code, which comprises one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in a different order than that noted in the figures. For example, two blocks noted in succession can in fact be executed substantially concurrently or in the opposite order, depending on the functionality involved. It should also be noted that each block in the block diagrams and / or flow diagrams, and combinations of blocks in the block diagrams and / or flow diagrams, can be implemented by dedicated hardware-based systems that perform the specified functions or operations, or can be implemented by a combination of dedicated hardware-based systems and computer instructions.

[0119] The modules involved in the embodiments of the present application can be implemented in software or in hardware. In some cases, the name of the module does not constitute a limitation on the unit itself.

[0120] The readable storage medium provided by the present application is a computer readable storage medium, which stores computer readable program instructions (i.e. computer programs) for executing the above-mentioned battery cell thermal runaway early warning method, and can solve the technical problem that the conventional battery management system generally alarms voltage and temperature, but it is difficult to effectively perform thermal runaway early warning when the battery fails. Compared with the prior art, the computer readable storage medium provided by the present application has the same beneficial effects as the battery cell thermal runaway early warning method provided by the above-mentioned embodiments, and will not be described here.

[0121] The present application also provides a computer program product comprising a computer program, which, when executed by a processor, implements the steps of the battery cell thermal runaway early warning method as described above.

[0122] The computer program product provided by the present application can solve the technical problem that the conventional battery management system generally alarms voltage and temperature, but it is difficult to effectively perform thermal runaway early warning when the battery fails. Compared with the prior art, the computer program product provided by the present application has the same beneficial effects as the battery cell thermal runaway early warning method provided by the above-mentioned embodiments, and will not be described here.

[0123] The above-mentioned is only part of the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields made by using the content of the present application specification and drawings under the technical concept of the present application are included in the patent protection scope of the present application.

Claims

1. A method for early warning of thermal runaway in battery cells, characterized in that, The method is applied to a battery system comprising multiple battery modules, each battery module comprising multiple battery cells, wherein the battery modules communicate with each other via daisy-chaining. The method includes: The battery cell status data and the communication status data between the battery module and the battery cell in the battery system are obtained, and the communication status data is determined by the daisy-chain communication. Determine whether the cell status data and the communication status data meet the preset thermal runaway conditions; If the preset thermal runaway conditions are met, a thermal runaway warning will be issued for the battery system. The cell status data includes the cell temperature, temperature change rate, and temperature-time value of the cell. The preset thermal runaway condition includes a first thermal runaway condition, which includes: the cell temperature reaching a preset temperature extreme value; the temperature change rate reaching a preset temperature rise rate; and the temperature-time value meeting a preset time condition. The step of providing a thermal runaway warning for the battery system if the preset thermal runaway condition is met includes: determining that the battery system is in a thermal runaway state and providing a thermal runaway warning when the cell temperature, the temperature change rate, and the temperature-time value meet the first thermal runaway condition. The cell status data further includes the cell temperature sampling invalid time, and the preset thermal runaway condition further includes a third thermal runaway condition, which includes: the cell temperature reaching the preset temperature extreme value; and the temperature time value and the temperature sampling invalid time meeting the preset time condition; the step of issuing a thermal runaway warning for the battery system if the preset thermal runaway condition is met includes: when the cell temperature, the temperature sampling invalid time, and the temperature time value meet the third thermal runaway condition, determining that the battery system is in a thermal runaway state and issuing a thermal runaway warning.

2. The method as described in claim 1, characterized in that, The cell status data also includes the cell voltage and voltage-time value of the cell. The preset thermal runaway condition also includes a second thermal runaway condition, which includes: the cell voltage reaching a preset voltage extreme value; the temperature change rate reaching the preset temperature rise rate; and the voltage-time value and the temperature-time value meeting the preset time condition. The step of issuing a thermal runaway warning for the battery system if the preset thermal runaway conditions are met includes: When the cell voltage, voltage-time, temperature change rate, and temperature-time value meet the second thermal runaway condition, the battery system is determined to be in a thermal runaway state, and a thermal runaway warning is issued.

3. The method as described in claim 1, characterized in that, The communication status data includes daisy-chain communication faults and fault time values; the preset thermal runaway conditions also include a fourth thermal runaway condition, which includes: the cell temperature reaching the preset temperature extreme value; and the fault time value meeting the preset time condition; The step of issuing a thermal runaway warning for the battery system if the preset thermal runaway conditions are met includes: When the cell temperature, the daisy-chain communication failure, and the failure time value meet the fourth thermal runaway condition, the battery system is determined to be in a thermal runaway state, and a thermal runaway warning is issued.

4. The method according to any one of claims 1 to 3, characterized in that, Following the step of issuing a thermal runaway warning for the battery system if the preset thermal runaway conditions are met, the method further includes: After issuing a thermal runaway warning, a high-voltage power-down command is generated; The high-voltage relay of the vehicle is disconnected according to the high-voltage power-down command.

5. A cell thermal runaway early warning device, characterized in that, The cell thermal runaway early warning device executes the cell thermal runaway early warning method as described in claim 1. The device is applied to a battery system comprising multiple battery modules, each battery module comprising multiple cells, the battery modules communicating via daisy-chain. The device includes: The data acquisition module is used to acquire the cell status data of the battery cells in the battery system and the communication status data between the battery modules, wherein the communication status data is determined by the daisy-chain communication. The condition judgment module is used to determine whether the cell status data and the communication status data meet the preset thermal runaway conditions; The runaway warning module is used to provide a thermal runaway warning for the battery system if the preset thermal runaway conditions are met.

6. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the cell thermal runaway early warning method as described in any one of claims 1 to 4.

7. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the cell thermal runaway early warning method as described in any one of claims 1 to 4.

8. A vehicle, characterized in that, The vehicle performs the steps of implementing the cell thermal runaway early warning method as described in any one of claims 1 to 4.

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