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

Abstract

The invention discloses a battery cell thermal runaway early warning method and device, a storage medium, a program product and a vehicle, and relates to the technical field of batteries, the method is applied to a battery system comprising a plurality of battery modules, each battery module comprises a plurality of battery cells, and daisy chain communication is adopted between the battery modules. The method comprises the following steps: acquiring battery cell state data of a battery cell and communication state data between battery modules, wherein the communication state data is determined by daisy chain communication; judging whether the cell state data and the communication state data meet a preset thermal runaway condition or not; and if yes, carrying out thermal runaway early warning on the battery system. The battery management system not only collects the state data of the battery core, but also monitors the communication state data of the daisy chain communication between the battery modules in real time, so that whether the battery system meets the preset thermal runaway condition or not can be comprehensively judged, the single condition that a traditional battery management system alarms voltage and temperature is avoided, and the battery management system is more intelligent. Therefore, the accuracy and timeliness of early warning of the thermal runaway event of the battery are improved.

Description

Technical Field

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

[0002] As a strategic emerging technology industry, new energy vehicles can alleviate the problems of energy shortage and environmental pollution. Among them, the electrification of automobile power systems has gradually become one of the main trends in the development of future automobile technology. The main feature of the electrification of automobile power systems is the use of electrical energy instead of chemical energy as the main driving energy source of the vehicle. Lithium-ion power batteries are often used as energy sources for pure electric vehicles because of their high specific energy, low self-discharge rate and long cycle life.

[0003] However, lithium-ion batteries are a chemical power source with poor stability. When they are abused by external factors or have manufacturing defects, thermal runaway events may occur, resulting in serious personal and property losses. When thermal runaway cannot be completely avoided, early warning of thermal runaway is particularly important. Traditional battery management systems generally alarm on voltage and temperature, but these alarm items are usually difficult to effectively warn of thermal runaway when the battery fails.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of this application is to provide a battery cell thermal runaway warning method, device, storage medium, program product and vehicle, aiming to solve the technical problem that traditional battery management systems generally alarm on voltage and temperature, but it is difficult to effectively provide thermal runaway warning when the battery fails.

[0006] To achieve the above object, the present application proposes a battery cell thermal runaway early warning method, the method is applied to a battery system including a plurality of battery modules, the battery module including a plurality of battery cells, the battery modules using daisy chain communication, the method comprising:

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

[0008] Determining whether the battery cell status data and the communication status data meet preset thermal runaway conditions;

[0009] If the preset thermal runaway condition is met, a thermal runaway warning is issued to the battery system.

[0010] In one embodiment, the cell state 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, and the first thermal runaway condition includes: the cell temperature reaches a preset temperature extreme value; and, the temperature change rate reaches a preset temperature rise rate; and, the temperature time value meets a preset time condition;

[0011] The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes:

[0012] When the battery cell temperature, the temperature change rate, and the temperature-time value meet the first thermal runaway condition, the battery system is determined to be in a thermal runaway state, and a thermal runaway warning is issued.

[0013] In one embodiment, the cell state data further includes a cell voltage and a voltage-time value of the cell, the preset thermal runaway condition further includes a second thermal runaway condition, and the second thermal runaway condition includes: the cell voltage reaches a preset voltage extreme value; and, the temperature change rate reaches the preset temperature rise rate; and, the voltage-time value and the temperature-time value meet the preset time condition;

[0014] The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes:

[0015] When the cell voltage, the voltage time, the temperature change rate and the 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.

[0016] In one embodiment, the cell state data further includes the invalid time of temperature sampling of the cell, the preset thermal runaway condition further includes a third thermal runaway condition, and the third thermal runaway condition includes: the cell temperature reaches the preset temperature extreme value; and, the temperature time value and the invalid time of temperature sampling meet the preset time condition;

[0017] The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes:

[0018] When the battery cell temperature, the temperature sampling invalid time and the temperature-time value meet the third thermal runaway condition, the battery system is determined to be in a thermal runaway state, and a thermal runaway warning is issued.

[0019] In one embodiment, the communication status data includes a daisy chain communication fault and a fault time value; the preset thermal runaway condition further includes a fourth thermal runaway condition, and the fourth thermal runaway condition includes: the battery cell temperature reaches the preset temperature extreme value; and, the fault time value meets the preset time condition;

[0020] The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes:

[0021] When the battery cell temperature, the daisy chain communication fault, and the fault 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.

[0022] In one embodiment, after the step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met, the method further includes:

[0023] After the thermal runaway warning is issued, a high voltage power-off command is generated;

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

[0025] In addition, to achieve the above-mentioned purpose, the present application also proposes a battery cell thermal runaway warning device, which is applied to a battery system including a plurality of battery modules, wherein the battery module includes a plurality of battery cells, and the battery modules communicate with each other using a daisy chain, and the device includes:

[0026] A data acquisition module, used for acquiring cell status data of the cell in the battery system and communication status data between the battery modules, wherein the communication status data is determined by the daisy chain communication;

[0027] A condition judgment module, used to judge whether the battery cell status data and the communication status data meet the preset thermal runaway condition;

[0028] The runaway warning module is used to issue a thermal runaway warning to the battery system if the preset thermal runaway condition is met.

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

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

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

[0032] One or more technical solutions proposed in this application have at least the following technical effects: This application is applied to a battery system including multiple battery modules, wherein the battery module includes multiple battery cells, and daisy chain communication is adopted between the battery modules. First, the battery cell status data of the battery cells in the battery system and the communication status data between the battery modules are obtained, and the communication status data is determined by the daisy chain communication; then, it is determined whether the battery 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 is issued to the battery system. Since this application not only collects the battery cell status data of the battery cells, but also monitors the communication status data of the daisy chain communication between the battery modules in real time, it can comprehensively monitor whether the battery system meets the preset thermal runaway conditions, avoiding the situation where the traditional battery management system issues a single alarm for voltage and temperature, thereby improving the accuracy and timeliness of the battery's thermal runaway events. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 A flow chart of the first embodiment of the method for early warning of thermal runaway of a battery cell provided in the present application;

[0036] Figure 2 A schematic diagram of the internal modules and temperature sampling of the battery system provided in Example 1 of the present application;

[0037] Figure 3 A schematic diagram of the internal modules and voltage sampling of the battery system provided in Example 1 of the present application;

[0038] Figure 4 A flow chart of the second embodiment of the method for early warning of thermal runaway of a battery cell provided in the present application;

[0039] Figure 5 The system thermal runaway judgment conditions and logic diagram provided in the second embodiment of the present application;

[0040] Figure 6 This is a schematic diagram of the module structure of the battery cell thermal runaway warning device according to an embodiment of the present application;

[0041] Figure 7Schematic diagram of the equipment structure of the hardware operating environment involved in the battery cell thermal runaway warning method in the embodiment of the present application.

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to 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 solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0045] The current battery management system only alarms for a single change in voltage or temperature, and the alarm threshold is usually set too high, which cannot effectively warn of thermal runaway. This patent application not only uses information such as voltage and temperature to make judgments, but also monitors and identifies the fault phenomenon of the battery cell when thermal runaway occurs and the changes in the process in real time, and introduces events such as daisy chain communication, arranges and combines different events, event-time relationships, and other thermal runaway processes and phenomena, and generates different thermal runaway judgment conditions, which greatly improves the accuracy and timeliness of thermal runaway events and improves personnel safety.

[0046] It should be noted that the execution subject of this embodiment can be an electronic device with data collection and thermal runaway warning functions, such as an onboard computer, a vehicle controller (VCU), a battery management system, etc., or an electronic device that can realize the above functions, a battery cell thermal runaway warning device (hereinafter referred to as a warning device) that executes the battery cell thermal runaway warning method of this application, etc., and this embodiment does not limit this. The following takes the warning device as an example to illustrate this embodiment and the following embodiments.

[0047] Based on this, the present application embodiment provides a battery cell thermal runaway warning method, referring to Figure 1 , Figure 1 A flow chart of the first embodiment of the thermal runaway warning method for a battery cell of the present application is provided.

[0048] In this embodiment, the method is applied to a battery system including a plurality of battery modules, wherein the battery module includes a plurality of battery cells, and the battery modules communicate with each other using a daisy chain. The battery cell thermal runaway warning method includes steps S10 to S30:

[0049] Step S10: acquiring cell status data of the cell in the battery system and communication status data between the battery modules, wherein the communication status data is determined by the daisy chain communication.

[0050] It should be noted that this embodiment is applied to a battery system, and reference may be made to Figure 2 , Figure 2 The schematic diagram of the internal module and temperature sampling of the battery system provided in the first embodiment of the present application is shown in FIG. The battery system consists of multiple cells (such as Figure 2 Cells 1 to 6 are shown in the figure); FPC (Flexible Printed Circuit) temperature sampling line is used for temperature sampling; a temperature probe NTC is designed at the positive pole ear of each cell upper end cover to monitor the real-time temperature information of each cell; the FPC lead is connected to the slave control sampling board CMC for NTC temperature detection; each cell is provided with a cell explosion-proof valve. When the cell thermal runaway occurs, the internal temperature of the cell rises sharply, which will cause the cell explosion-proof valve to explode to ensure safety.

[0051] Furthermore, the battery system may consist of multiple battery modules (such as Figure 3 As shown, module 1 and module 2) are composed, Figure 3 The schematic diagram of the internal module and voltage sampling of the battery system provided in the first embodiment of the present application. The positive and negative cell tabs of each cell upper end cap are led out by FPC, and the CMC detects the single cell voltage of each cell through the voltage acquisition front end AFE (Analog front end). The power supply of AFE is provided by the module. AFE (such as Figure 3 As shown, internal daisy chain communication is adopted between AFE1 and AFE2, and all cell voltage information is sent between the main board BMU and the slave board CMC via CAN communication.

[0052] It should be noted that Figure 3 Take two modules as an example. This embodiment does not limit the number of modules. When the number of modules is greater than 2, the principle is the same as Figure 3 Equivalent.

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

[0054] For example, the cell status data may include data such as the voltage, current, temperature, internal resistance, and discharge time of the cell. The cell status data can be used to detect the operating conditions of the cell and ensure the safety of the battery system.

[0055] It should be noted that daisy chain communication is a device connection method. In this method, multiple slave CMCs are connected in a linear manner, just like the petals of a chrysanthemum, and data signals are transmitted along the slave CMCs one by one. The output of a slave CMC is connected to the input of the next slave CMC, and information can be transmitted and exchanged between each slave CMC in turn, thereby realizing data communication and interaction.

[0056] It should be noted that the communication status data is used to describe the communication status between slave CMCs, such as signal strength, connection stability, transmission rate, delay time, packet loss rate, bit error rate, etc. The communication status data can be used to understand the communication status between battery modules.

[0057] In one embodiment, the early warning device may first obtain the cell status data of the battery cells in the battery system and the communication status data between the battery modules, such as the real-time information of the battery cells, the daisy chain communication status, the voltage of each single cell and the minimum voltage of each single cell, the temperature and maximum temperature of each module, the communication status between the main board BMU and the slave board CMC, and other data.

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

[0059] It should be noted that the preset thermal runaway condition is a pre-set condition for determining whether the battery cell has thermal runaway. Specifically, the battery cell status data and the data showing thermal runaway in the communication status data can be arranged and combined to generate different thermal runaway judgment conditions. For example, if the temperature is greater than the normal value and the duration is greater than 2S and the temperature changes too much, it can be defined as a preset thermal runaway condition, and the system is determined to have thermal runaway at this time; other combinations are also possible, and this embodiment does not limit this.

[0060] Step S30: If the preset thermal runaway condition is met, a thermal runaway warning is issued to the battery system.

[0061] In this embodiment, the early warning device can first obtain the cell status data of the battery cells in the battery system and the communication status data between the battery modules, such as the real-time information of the battery cells, the daisy chain communication status, the voltage of each single cell and the lowest voltage of the single cell, the temperature of each module and the highest temperature, the communication status of the main board BMU and the slave board CMC, etc. Then, it is determined whether the preset thermal runaway conditions are met based on the cell status data and the communication status data. When the preset thermal runaway conditions are met, the battery system is warned of thermal runaway. By real-time monitoring of the communication status data of the daisy chain communication between the battery modules, it is possible to comprehensively monitor whether the battery system meets the preset thermal runaway conditions, thereby avoiding the situation where the traditional battery management system only alarms the voltage and temperature, thereby improving the accuracy and timeliness of the battery's thermal runaway events.

[0062] In a feasible implementation manner, after step S30 of this embodiment, the following steps may be included: after performing a thermal runaway warning, generating a high-voltage power-off instruction; and controlling the high-voltage relay of the vehicle to disconnect according to the high-voltage power-off instruction.

[0063] It should be noted that the high-voltage power-off command is an instruction to cut off power to the vehicle's high-voltage electrical system after the battery cell has thermal runaway, in order to prevent the thermal runaway from further spreading.

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

[0065] By disconnecting the high-voltage relay, the circuit of the high-voltage part of the vehicle can be cut off, the transmission of high-voltage electric energy can be stopped, and the high-voltage system of the vehicle can be powered off, so as to ensure the safety of personnel after the battery cell has thermal runaway.

[0066] In this embodiment, after the battery system has thermal runaway, the 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 command to all high-voltage control units, and then immediately controls the high-voltage relay to disconnect 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 instrument thermal runaway light and emits a fault alarm sound to inform personnel to evacuate as soon as possible.

[0067] This embodiment provides a method for early warning of thermal runaway of a battery cell. The early warning device can first obtain the battery cell status data of the battery cell in the battery system and the communication status data between the battery modules, such as the real-time information of the battery cell, the daisy chain communication status, the voltage of each single battery cell and the lowest voltage of the single battery cell, the temperature of each module and the highest temperature, the communication status of the main board BMU and the slave board CMC, and other data. Then, it is determined whether the preset thermal runaway conditions are met based on the battery cell status data and the communication status data. When the preset thermal runaway conditions are met, the battery system is warned of thermal runaway. Since this embodiment not only collects the battery cell status data of the battery cell, but also monitors the communication status data of the daisy chain communication between the battery modules in real time, and at the same time arranges and combines the processes and phenomena of thermal runaway such as different events, events and time relationships, and generates different thermal runaway judgment conditions. In this way, it is possible to comprehensively monitor whether the battery system meets the preset thermal runaway conditions, avoid the situation where the traditional battery management system issues a single alarm for voltage and temperature, and improve the accuracy and timeliness of the battery's thermal runaway events.

[0068] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 , Figure 4 A flow chart of the second embodiment of the thermal runaway warning method for a battery cell of the present application is provided.

[0069] In this embodiment, the battery cell status data includes the battery cell temperature, temperature change rate and temperature-time value of the battery cell. The preset thermal runaway condition includes a first thermal runaway condition. The first thermal runaway condition includes: the battery cell temperature reaches a preset temperature extreme value; and, the temperature change rate reaches a preset temperature rise rate; and, the temperature-time value meets the preset time condition.

[0070] Accordingly, step S30 of this example includes step S31: when the battery cell temperature, the temperature change rate and the temperature-time value meet the first thermal runaway condition, determining that the battery system is in a thermal runaway state, and issuing a thermal runaway warning.

[0071] It should be noted that the cell temperature is the temperature of the battery cell itself. The temperature change rate is the rate at which the cell temperature increases or decreases within a certain period of time, reflecting 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 the maximum temperature limit value that the battery cell is allowed to reach, such as about 60°C, which can be set according to actual conditions and is not limited in this embodiment. The preset temperature rise rate is the preset speed limit of the temperature rise. The preset time condition is the preset limit on the maintenance time of the battery cell temperature, temperature change rate, voltage change, etc.

[0073] In this embodiment, for ease of understanding, refer to Figure 5 , Figure 5 The system thermal runaway judgment conditions and logic diagram provided in the second embodiment of the present application. According to the temperature characteristics of the battery cell under normal conditions, the preset temperature extreme value of thermal runaway can be set as Tmax, and the preset temperature rise rate can be set as α max Assume that the temperature of the battery module at the initial moment is T0, the temperature at any moment is Tn, and the single update rate of the BMU temperature is T. Then the BMU calculates the temperature change rate per unit time as:

[0074] α=d(Tn-T0) / T;

[0075] At this time, event 1 can be defined: the temperature extreme value of the battery cell temperature ≧Tmax and the duration tmax>2S;

[0076] Define event 2: The rate of increase of temperature change rate ≧α max And the duration tα>3S;

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

[0078] In a feasible implementation manner, the battery cell status data described in this embodiment also includes the battery cell voltage and voltage-time value of the battery cell, and the preset thermal runaway condition also includes a second thermal runaway condition, and the second thermal runaway condition includes: the battery cell voltage reaches a preset voltage extreme value; and, the temperature change rate reaches the preset temperature rise rate; and, the voltage-time value and the temperature-time value meet the preset time condition.

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

[0080] It should be noted that the cell voltage is the potential difference between the two poles of the cell, reflecting the state of the electric energy stored in the cell. The preset voltage extreme value is the preset limit value of the maximum voltage allowed to be reached by the cell, such as 800V, which can be set according to actual conditions, and this embodiment does not limit this. The voltage time value is the time that the cell voltage of the cell is maintained at the maximum voltage limit value.

[0081] In this implementation mode, for ease of understanding, Figure 5 As shown in the figure, the preset voltage limit of thermal runaway can be set to V0 according to the voltage and temperature characteristics of the battery cell under normal conditions.

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

[0083] When event 2 and event 3 occur and the time difference between them is △t<5min, the second thermal runaway condition (ie, thermal runaway condition 2) is met, and it can be determined that the system has thermal runaway.

[0084] In another feasible implementation, the battery cell status data of this embodiment also includes the invalid time of temperature sampling of the battery cell, and the preset thermal runaway condition also includes a third thermal runaway condition, and the third thermal runaway condition includes: the battery cell temperature reaches the preset temperature extreme value; and, the temperature time value and the invalid time of temperature sampling meet the preset time condition.

[0085] Correspondingly, the step S30 includes: when the battery 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.

[0086] It should be noted that if Figure 3As shown, when thermal runaway occurs in the battery cell, the internal temperature of the battery cell rises sharply, causing the battery cell explosion-proof valve to explode. At this time, the CMC temperature sampling line will be disconnected under the impact force of the battery cell explosion, and the temperature detection value of the CMC is 65535 (that is, 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 invalid temperature value Ti.

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

[0089] When event 1 and event 4 occur and the time difference between them is △t<25min, the third thermal runaway condition (ie, thermal runaway condition 3) is met, and it can be determined that the system has thermal runaway.

[0090] In another feasible implementation, the communication status data in this embodiment includes a daisy chain communication fault and a fault time value; the preset thermal runaway condition also includes a fourth thermal runaway condition, and the fourth thermal runaway condition includes: the battery cell temperature reaches the preset temperature extreme value; and, the fault time value meets the preset time condition.

[0091] Correspondingly, the step S30 includes: when the battery cell temperature, the daisy chain communication fault and the fault time value meet the fourth thermal runaway condition, determining that the battery system is in a thermal runaway state, and performing a 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, such as Figure 3 As shown, when the battery cell in module 2 experiences thermal runaway, the internal temperature of the battery cell rises sharply and the battery cell explosion-proof valve will explode. At this time, the FPC voltage sampling line in module 2 will be disconnected under the impact of the battery cell explosion, the power supply of AFE2 will be disconnected, AFE2 cannot work normally, the daisy chain communication between AFE1 and AFE2 is disconnected, and the CMC reports the daisy chain communication failure to the BMU.

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

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

[0095] When event 1 and event 5 occur and the time difference between them is △t<25min, the fourth thermal runaway condition (ie, thermal runaway condition 4) is met, and it can be determined that the system has thermal runaway.

[0096] It should be noted that if any one of the above thermal runaway conditions 1, 2, 3 and 4 is met, the system determines that thermal runaway has occurred.

[0097] It should be noted that the above time settings are only examples, and the time can also be set according to actual conditions, which is not limited in this embodiment.

[0098] This embodiment takes into account that the current battery management system only alarms for a single condition of voltage or temperature, and the alarm item threshold is usually set relatively large, which cannot effectively provide thermal runaway warning. This embodiment not only makes judgments based on information such as battery cell temperature, temperature change rate, temperature time value, battery cell voltage, voltage time value, and invalid temperature sampling time, but also monitors and identifies the fault phenomenon of the battery cell when thermal runaway occurs and the changes in the process in real time, and introduces events such as daisy chain communication, arranges and combines the processes and phenomena of thermal runaway such as different events, event and time relationships, and generates different thermal runaway judgment conditions, which greatly improves the accuracy and timeliness of thermal runaway events and improves the safety of personnel.

[0099] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the battery cell thermal runaway warning method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0100] This application also provides a battery cell thermal runaway warning device, please refer to Figure 6 , Figure 6 The module structure diagram of the battery cell thermal runaway warning device of the embodiment of the present application is as follows; the device is applied to a battery system including a plurality of battery modules, the battery module includes a plurality of battery cells, and the battery modules use daisy chain communication. The battery cell thermal runaway warning device includes:

[0101] A data acquisition module 601 is used to obtain the cell status data of the cell 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;

[0102] A condition judgment module 602 is used to judge whether the battery cell status data and the communication status data meet a preset thermal runaway condition;

[0103] The runaway warning module 603 is used to issue a thermal runaway warning to the battery system if the preset thermal runaway condition is met.

[0104] The battery cell thermal runaway warning device provided in the present application adopts the battery cell thermal runaway warning method in the above embodiment, which can solve the technical problem that the traditional battery management system generally alarms the voltage and temperature, but it is difficult to effectively provide thermal runaway warning when the battery fails. Compared with the prior art, the beneficial effects of the battery cell thermal runaway warning device provided in the present application are the same as the beneficial effects of the battery cell thermal runaway warning method provided in the above embodiment, and the other technical features of the battery cell thermal runaway warning device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0105] The present application provides a vehicle, wherein the vehicle is equipped with a battery cell thermal runaway warning device or apparatus, and executes the steps of implementing the battery cell thermal runaway warning method as described above.

[0106] The battery cell thermal runaway warning device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery cell thermal runaway warning method in the above-mentioned embodiment one.

[0107] Reference below Figure 7 , Figure 7 The device structure diagram of the hardware operating environment involved in the battery cell thermal runaway warning method in the embodiment of the present application shows a schematic diagram of the structure of the battery cell thermal runaway warning device suitable for implementing the embodiment of the present application. The battery cell thermal runaway warning device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The battery cell thermal runaway warning device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0108] like Figure 7As shown, the battery cell thermal runaway warning device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the battery cell thermal runaway warning device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, 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.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 can allow the battery cell thermal runaway warning device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a battery cell thermal runaway warning device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0109] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

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

[0111] It should be understood that the various parts disclosed in this application can be implemented by 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 one or more embodiments or examples in a suitable manner.

[0112] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0113] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the battery cell thermal runaway warning method in the above-mentioned embodiment.

[0114] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more 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 suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0115] The computer-readable storage medium may be included in the battery cell thermal runaway warning device; or may exist independently without being assembled into the battery cell thermal runaway warning device.

[0116] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the battery cell thermal runaway warning device, the battery cell thermal runaway warning device: obtains the battery cell status data of the battery cell in the battery system and the communication status data between the battery modules, and the communication status data is determined by the daisy chain communication; determines whether the battery 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 is issued for the battery system.

[0117] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may 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 may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0118] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0119] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0120] The readable storage medium provided in 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 warning method, and can solve the technical problem that the traditional battery management system generally alarms the voltage and temperature, but it is difficult to effectively provide thermal runaway warning when the battery fails. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the battery cell thermal runaway warning method provided in the above-mentioned embodiment, and will not be repeated here.

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

[0122] The computer program product provided by the present application can solve the technical problem that the traditional battery management system generally alarms voltage and temperature, but it is difficult to effectively provide thermal runaway warning when the battery fails. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the battery cell thermal runaway warning method provided by the above embodiment, which will not be elaborated here.

[0123] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery cell thermal runaway early warning method, characterized in that: The method is applied to a battery system including a plurality of battery modules, wherein the battery modules include a plurality of battery cells, and the battery modules communicate with each other using a daisy chain. The method includes: Acquire cell status data of the cell in the battery system and communication status data between the battery modules, wherein the communication status data is determined by the daisy chain communication; Determining whether the battery cell status data and the communication status data meet preset thermal runaway conditions; If the preset thermal runaway condition is met, a thermal runaway warning is issued to the battery system.

2. The method according to claim 1, characterized in that 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, and the first thermal runaway condition includes: the cell temperature reaches a preset temperature extreme value; and, the temperature change rate reaches a preset temperature rise rate; and, the temperature-time value meets a preset time condition; The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes: When the battery cell temperature, the temperature change rate, and the temperature-time value meet the first 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 according to claim 2, 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, the second thermal runaway condition includes: the cell voltage reaches a preset voltage extreme value; and, the temperature change rate reaches the preset temperature rise rate; and, the voltage-time value and the temperature-time value meet the preset time condition; The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes: When the cell voltage, the voltage time, the temperature change rate and the 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.

4. The method according to claim 2, characterized in that The cell status data also includes the invalid time of temperature sampling of the cell, and the preset thermal runaway condition also includes a third thermal runaway condition, and the third thermal runaway condition includes: the cell temperature reaches the preset temperature extreme value; and, the temperature time value and the invalid time of temperature sampling meet the preset time condition; The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes: When the battery cell temperature, the temperature sampling invalid time and the temperature-time value meet the third thermal runaway condition, the battery system is determined to be in a thermal runaway state, and a thermal runaway warning is issued.

5. The method according to claim 2, characterized in that The communication status data includes a daisy chain communication fault and a fault time value; the preset thermal runaway condition also includes a fourth thermal runaway condition, and the fourth thermal runaway condition includes: the battery cell temperature reaches the preset temperature extreme value; and the fault time value meets the preset time condition; The step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met includes: When the battery cell temperature, the daisy chain communication fault, and the fault time value meet the fourth thermal runaway condition, it is determined that the battery system is in a thermal runaway state, and a thermal runaway warning is issued.

6. The method according to any one of claims 1 to 5, characterized in that After the step of providing a thermal runaway warning to the battery system if the preset thermal runaway condition is met, the method further includes: After the thermal runaway warning is issued, a high voltage power-off command is generated; The high-voltage relay of the vehicle is controlled to be disconnected according to the high-voltage power-off instruction.

7. A battery cell thermal runaway warning device, characterized in that: The device is applied to a battery system including a plurality of battery modules, wherein the battery modules include a plurality of battery cells, and the battery modules communicate with each other using a daisy chain. The device includes: A data acquisition module, used for acquiring cell status data of the cell in the battery system and communication status data between the battery modules, wherein the communication status data is determined by the daisy chain communication; A condition judgment module, used to judge whether the battery cell status data and the communication status data meet the preset thermal runaway condition; The runaway warning module is used to issue a thermal runaway warning to the battery system if the preset thermal runaway condition is met.

8. 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, the steps of the battery cell thermal runaway warning method according to any one of claims 1 to 6 are implemented.

9. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the battery cell thermal runaway warning method according to any one of claims 1 to 6 are implemented.

10. A vehicle, characterized in that: The vehicle executes the steps of implementing the battery cell thermal runaway warning method according to any one of claims 1 to 6.

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