CN117783914A - Method, device, equipment and storage medium for diagnosing thermal runaway of battery - Google Patents
Method, device, equipment and storage medium for diagnosing thermal runaway of battery Download PDFInfo
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Abstract
The invention discloses a thermal runaway diagnosis method, a device, equipment and a storage medium of a battery. The method collects temperature data and voltage data of the battery pack to be tested, and further determines a temperature rise detection result and a voltage detection result of the battery pack to be tested. And detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected. And under the condition that the temperature rise detection result, the communication detection result and the voltage detection result are all faults, determining that the battery pack to be tested has a thermal runaway fault. The detection result of the daisy chain communication is combined on the basis of the voltage and the temperature, the fluctuation of the voltage and the temperature in the thermal runaway fault is considered, the communication interruption of the daisy chain communication in the thermal runaway fault is combined, the reliable diagnosis of the thermal runaway fault is realized, and as the variation trend of the daisy chain communication, the voltage and the temperature is the same when different battery packs to be detected generate the thermal runaway, the method can be applied to different battery application scenes, and the compatibility degree of the diagnosis method and the stability of the battery packs are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a thermal runaway diagnosis method, a device, equipment and a storage medium of a battery.
Background
Thermal runaway is an important research topic for battery safety, and is receiving extensive attention from battery researchers. Because the battery with thermal runaway fault may have severe voltage and temperature fluctuation, which threatens the personal safety of the user, the battery needs to judge and respond early to the thermal runaway so as to avoid serious accidents in the use process of the battery.
In the conventional method for judging thermal runaway of a battery management system, temperature rise and pressure drop are taken as judging basis. In the application of the actual project, the thermal runaway diagnosis is carried out by combining other judgment bases according to the actual situation.
The diagnosis modes are different in actual judgment basis adopted in different battery application scenes, so that unified judgment cannot be carried out in the battery application scenes with multiple parallel items, and the compatibility is insufficient.
Disclosure of Invention
The invention provides a thermal runaway diagnosis method, device, equipment and storage medium for a battery, which are used for improving the compatibility degree of the diagnosis method and the stability of a battery pack.
According to an aspect of the present invention, there is provided a thermal runaway diagnosis method of a battery, including:
after the battery management system is electrified, acquiring temperature data and voltage data of the battery pack to be tested;
determining a temperature rise detection result of the battery pack to be detected according to the temperature data;
determining a voltage detection result of the battery pack to be detected according to the voltage data;
detecting a communication detection result of daisy chain communication corresponding to the battery pack to be detected;
and under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault.
Optionally, the voltage detection result includes a voltage sampling line result and a voltage value result, and the voltage detection result is a fault when the voltage sampling line result and/or the voltage value result is a fault.
Optionally, the temperature data includes a cell temperature of the cell;
after the battery management system is electrified, collecting temperature data and voltage data of the battery pack to be tested, including:
after the battery management system is electrified, acquiring the monomer temperature of the monomer battery once at intervals of a first time;
And determining a temperature rise detection result of the battery pack to be detected according to the temperature data, wherein the temperature rise detection result comprises:
after the monomer temperature is collected each time, determining a temperature rise value of the monomer battery in each first time interval in a first preset time period;
and determining a temperature rise detection result of the battery pack to be detected according to the relative relation between the temperature rise value and a preset temperature rise threshold value.
Optionally, the determining the temperature rise detection result of the battery pack to be detected according to the relative relation between the temperature rise value and a preset temperature rise threshold value includes:
under the condition that at least one temperature rise value exceeds the preset temperature rise threshold value, determining that the temperature rise detection result of the battery pack to be detected is a fault;
and under the condition that the Wen Shengzhi is below the preset temperature rise threshold, determining that the temperature rise detection result of the battery pack to be detected is normal.
Optionally, the voltage data includes a cell voltage of a cell;
after the battery management system is electrified, collecting temperature data and voltage data of the battery pack to be tested, including:
after the battery management system is electrified, collecting the single voltage of the single battery at intervals of a second time;
And determining a voltage detection result of the battery pack to be detected according to the voltage data, wherein the voltage detection result comprises the following steps:
after each time of acquisition of the single voltage, determining the acquisition line result of the battery pack to be tested according to the latest single voltage;
under the condition that the voltage sampling line result is normal, determining voltage differences between the single voltages of the single batteries in a previous second preset time period relative to the single voltages acquired at previous moments respectively;
and determining the voltage value result of the battery pack to be tested according to the relative relation between the voltage difference and a preset voltage difference threshold value.
Optionally, after each acquisition of the cell voltage, determining the acquisition line result of the to-be-tested battery pack according to the latest cell voltage includes:
judging whether the latest monomer voltage is invalid data or not;
under the condition that the latest monomer voltage is the invalid data, determining that the sampling line result is a fault;
and under the condition that the latest monomer voltage is the invalid data, determining that the sampling line result is normal.
Optionally, the determining the voltage value result of the battery pack to be tested according to the relative relationship between the voltage difference and a preset voltage difference threshold value includes:
Under the condition that at least one voltage difference exceeds the preset voltage difference threshold value, determining that the voltage value result of the battery pack to be tested is a fault;
and under the condition that the voltage difference is below the preset voltage difference threshold value, determining that the voltage value result of the battery pack to be tested is normal.
According to another aspect of the present invention, there is provided a thermal runaway diagnosis device of a battery, the device including: the device comprises an acquisition module, a temperature rise result determination module, a voltage result determination module, a communication result determination module and a thermal runaway fault determination module;
the acquisition module is used for acquiring temperature data and voltage data of the battery pack to be tested after the battery management system is electrified;
the temperature rise result determining module is connected with the sampling module and is used for determining a temperature rise detection result of the battery pack to be detected according to the temperature data;
the voltage result determining module is connected with the sampling module and is used for determining a voltage detection result of the battery pack to be detected according to the voltage data;
the communication result determining module is respectively connected with the temperature rise result determining module and the voltage result determining module and is used for detecting a communication detection result of daisy chain communication corresponding to the battery pack to be detected;
The thermal runaway fault determining module is connected with the communication result determining module and is used for determining that the thermal runaway fault occurs in the battery pack to be tested under the condition that the temperature rise detecting result, the communication detecting result and the voltage detecting result in the battery pack to be tested are all faults.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the thermal runaway diagnosis method of a battery according to any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to execute the thermal runaway diagnosis method of a battery according to any one of the embodiments of the present invention.
The thermal runaway diagnosis method, the device, the equipment and the storage medium of the battery provided by the embodiment of the invention acquire the temperature data and the voltage data of the battery pack to be detected, and further determine the temperature rise detection result and the voltage detection result of the battery pack to be detected. And detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected. And under the condition that the temperature rise detection result, the communication detection result and the voltage detection result are all faults, determining that the battery pack to be tested has a thermal runaway fault. The detection result of the daisy chain communication is combined on the basis of the voltage and the temperature, the fluctuation of the voltage and the temperature in the thermal runaway fault is considered, the communication interruption of the daisy chain communication in the thermal runaway fault is combined, the reliable diagnosis of the thermal runaway fault is realized, and as the variation trend of the daisy chain communication, the voltage and the temperature is the same when different battery packs to be detected generate the thermal runaway, the method can be applied to different battery application scenes, and the compatibility degree of the diagnosis method and the stability of the battery packs are improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a thermal runaway diagnosis method for a battery according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another thermal runaway diagnosis method for a battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram showing the composition of a thermal runaway diagnosis device for a battery according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of the structure of an electronic device that may be used to implement an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a thermal runaway diagnosis method of a battery, wherein the battery can refer to a battery pack, and the battery pack comprises a plurality of single batteries. Fig. 1 is a schematic flow chart of a thermal runaway diagnosis method for a battery according to an embodiment of the present invention, where the method may be performed by a thermal runaway diagnosis device for a battery, the thermal runaway diagnosis device for a battery may be implemented in hardware and/or software, and the thermal runaway diagnosis device for a battery may be configured in a battery management system. As shown in fig. 1, the thermal runaway diagnosis method of the battery includes:
S101, after the battery management system is electrified, acquiring temperature data and voltage data of the battery pack to be tested.
Specifically, the battery management system refers to a management system of a battery pack to be tested, which is also called a BMS, and can collect, analyze and process operation data of the battery pack to be tested. The temperature data refers to state data related to temperature of the battery pack to be tested during operation, and the temperature data may include, for example, cell temperatures of individual cells collected in real time or intermittently. The voltage data refers to state data related to voltage of the battery pack to be tested in the operation process, and the voltage data may include cell voltages of individual cells collected in real time or intermittently. The collection of temperature data and voltage data for the battery pack under test may be implemented using an analog front end (also referred to as AFE) in the battery management system.
S102, determining a temperature rise detection result of the battery pack to be detected according to the temperature data.
Specifically, the temperature rise detection result refers to a detection result of whether the temperature rise condition of the battery to be detected is normal or not. And determining the temperature rise parameter of the battery pack to be detected according to the temperature data, comparing the temperature rise parameter with the corresponding temperature rise threshold value, and judging the temperature rise detection result of the battery pack to be detected. The temperature rise parameters of each single battery in the battery to be measured in the previous preset time period can be determined according to the temperature data, and then the temperature rise parameters are compared with the temperature rise threshold corresponding to the previous preset time period. And under the condition that at least one temperature rise parameter exceeds the corresponding temperature rise threshold value, determining that the temperature rise detection result of the battery pack to be detected is a fault, otherwise, determining that the temperature rise detection result of the battery pack to be detected is normal.
And S103, determining a voltage detection result of the battery pack to be detected according to the voltage data.
Specifically, the voltage detection result refers to the voltage drop condition of the battery to be detected and the detection result of the sampling line state. The voltage drop parameter and the voltage sampling result of the battery pack to be tested can be determined according to the voltage data, wherein the voltage sampling result refers to a judging result of whether the voltage sampling is successful or not, and the state of a sampling line can be indicated. And then according to the voltage drop parameter and the voltage sampling result, the voltage detection result of the battery pack to be detected can be determined. The voltage drop parameters and the voltage sampling results of the single batteries in the battery pack to be tested in the previous preset time period are determined according to the voltage data. Under the condition that the voltage sampling result of at least one single battery fails, the voltage detection result of the battery pack to be tested can be directly judged to be a fault, and the voltage drop parameter of the battery pack to be tested fails. In case the voltage sampling result is successful, the voltage drop parameter may be further compared with its corresponding voltage drop threshold. And under the condition that the voltage drop parameter does not exceed the corresponding voltage drop threshold value, judging that the voltage detection result of the battery pack to be detected is normal, otherwise, judging that the voltage detection result of the battery pack to be detected is fault. It should be noted that, after step S101, steps S102 and S103 are both set, that is, two steps may be sequentially performed in sequence, or two steps may be simultaneously performed respectively, and the implementation sequence of steps S102 and S103 is not limited, and only one embodiment is shown in fig. 1 by way of example.
S104, detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected.
In particular, direct communication is enabled between adjacent devices in the daisy chain, and communication between non-adjacent devices needs to be relayed through the devices between them. And all the devices in the battery pack to be tested are communicated through a daisy chain. The failure detection mode of the daisy-chain communication may input a current signal to a target communication link between two adjacent communication units in the daisy-chain, and read a voltage signal in the target communication link in response to the current signal, wherein the communication units may include an analog front end, for example. And judging whether communication faults exist between two adjacent communication units according to the voltage signals. In this way, daisy-chain communication links between adjacent communication units in the battery pack to be tested are sequentially detected. If at least one communication link in the battery pack to be tested is faulty, the communication detection result of the daisy chain communication is faulty, otherwise, the communication detection result of the daisy chain communication is normal.
And S105, under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault.
Specifically, the temperature rise detection result may indicate whether the temperature rise of each unit cell in the battery pack to be detected is normal. The communication detection result can indicate whether the daisy chain communication in the battery pack to be detected fails. The voltage detection result can indicate whether the voltage drop and the voltage acquisition condition of each single battery in the battery pack to be detected are normal or not. The temperature rise detection result, the communication detection result and the voltage detection result are closely related to the thermal runaway fault, the thermal runaway of all the battery packs to be detected can be comprehensively judged according to the three detection results, and under the condition that the three detection results are all faults, the thermal runaway fault of the battery packs to be detected can be determined.
According to the thermal runaway diagnosis method for the battery, provided by the embodiment, after the battery management system is electrified, temperature data and voltage data of the battery pack to be tested are collected. And determining a temperature rise detection result of the battery pack to be detected according to the temperature data. And determining a voltage detection result of the battery pack to be detected according to the voltage data. And detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected. And under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault. The detection results of the daisy chain communication are combined on the basis of the voltage and the temperature, so that the fluctuation of the voltage and the temperature in the thermal runaway fault is considered, the communication interruption of the daisy chain communication in the thermal runaway fault is combined, the reliable diagnosis of the thermal runaway fault is realized, and as the variation trend of the daisy chain communication, the voltage and the temperature is the same when different battery packs to be detected generate the thermal runaway, the diagnosis mode can be applied to different battery application scenes, and the compatibility degree of the diagnosis method and the stability of the battery packs are improved.
Fig. 2 is a schematic flow chart of another thermal runaway diagnosis method for a battery according to an embodiment of the present invention, and based on the foregoing embodiment, referring to fig. 2, the thermal runaway diagnosis method for a battery includes:
s201, after the battery management system is electrified, the monomer temperature of the monomer battery is collected once at intervals of a first time.
Specifically, the first time interval refers to a time interval for collecting the cell temperature of the cell, and may be equal to 1 second, for example. And the single temperature of all single batteries in the battery pack to be measured is respectively acquired in each temperature acquisition.
S202, after the temperature of the single battery is collected each time, determining the temperature rise value of the single battery in each first time interval in a first preset time period.
Specifically, step S202 is set after step S201, and after each acquisition of the cell temperature, the temperature rise value of each cell in the battery pack to be measured in each first time interval in the previous first preset time period is calculated respectively. The duration of the first preset time period is an integer multiple of the first time interval, for example, in a case where the first time interval is 1 second, the first preset time period may be n×1 second, where n is an integer greater than 1. And according to the monomer temperature acquired in the previous first preset time period, sequentially calculating the temperature rise of the monomer battery at intervals of a first time interval. And updating the window range of the temperature data after each acquisition of the monomer temperature by adopting a sliding window algorithm, and further determining the temperature rise value in each first time interval according to each monomer temperature in the window range.
For example, in the previous first preset period, the cell temperatures of the individual cells in the battery pack to be tested are collected at intervals of a first time, and the first time interval is assumed to be 1 second. Taking a single battery as an example, after the latest single temperature is collected, a window of temperature data is updated by utilizing a sliding window algorithm, the single temperature collected in the first second before the first preset time period is removed, and the latest collected single temperature is increased. The monomer temperature is collected every 1 second in the window, and the monomer temperature in the window also comprises the following time t at n times 1 、t 2 ，…，t n-1 、t n The monomer temperature T is respectively collected 1 、T 2 ，…，T n-1 、T n . By means of the temperature T of the monomer in the window 1 、T 2 ，…，T n-1 、T n-1 Subtracting the previous data from the latter data to sequentially calculate the temperature rise value DeltaT generated by the single battery in each second 1 、ΔT 2 、…、ΔT n-1 。
S203, determining a temperature rise detection result of the battery pack to be detected according to the relative relation between the temperature rise value and the preset temperature rise threshold value.
Specifically, the preset temperature rise threshold is a temperature rise threshold determined according to a maximum temperature rise value possibly generated by a normal single battery in a first time interval, and can be set according to thermal runaway experimental data or empirical data. After the temperature of the single battery is collected each time and the temperature rise value is determined, judging whether the temperature rise value of the single battery corresponding to the battery pack to be tested in each first time interval in the previous first preset time period exceeds a preset temperature rise threshold value or not, and further determining the temperature rise detection result of the battery pack to be tested. In an exemplary embodiment, in a case where at least one temperature rise value exceeds a preset temperature rise threshold, it is determined that a temperature rise detection result of the battery pack to be detected is a failure. And under the condition that the temperature rise values are below a preset temperature rise threshold value, determining that the temperature rise detection result of the battery pack to be detected is normal.
S204, after the battery management system is electrified, the single voltage of the single battery is collected once at intervals of a second time.
Specifically, the implementation sequence of step S204 and step S201 is not sequential, and may be determined according to the actual time interval setting. The second time interval refers to a time interval for collecting the cell voltage of the cell. The inventors contemplate that the voltage change rate is higher than the temperature change rate, the second time interval may be smaller than the first time interval, and the first time interval may be an integer multiple of the second time interval. Illustratively, the second time interval may be equal to 0.1 seconds. Similar to the temperature acquisition, each voltage acquisition also acquires the cell voltages of all the cells in the battery pack to be measured.
S205, after each single voltage acquisition, determining the acquisition line result of the battery pack to be tested according to the latest single voltage.
Specifically, the voltage detection result includes a line sampling result and a voltage value result, and in the case that the line sampling result and/or the voltage value result is a fault, the voltage detection result is a fault. The result of the collecting line is a judging result which can indicate whether the collecting line has fault conditions such as broken line or short circuit, and whether the collecting line is correctly connected can be determined according to whether the single voltage collected by the collecting line is an abnormal value, so that the result of the collecting line of the battery pack to be tested is determined. The voltage value result is a judgment result that can indicate whether the cell voltage is within a normal range. The voltage value has practical significance under the condition that the sampling line is normally connected, so that the sampling line result can be determined firstly in the process of determining the voltage detection result, and the voltage value result can be determined further under the condition that the sampling line result is normal. If the result of the line is a fault, the single voltage is invalid data, and the voltage value result can be directly determined as the fault without continuously determining the voltage detection result. It should be noted that, in other embodiments, the voltage value result may be further determined no matter what the line sampling result is, and the voltage detection result is determined to be a fault only when the line sampling result and the voltage value result are both faulty, so that the reliability of the determination result may be further improved by double determination.
For example, it is determined whether the latest cell voltage is an abnormal value, for example, in the case where the cell voltage has no specific value or a specific value of 0, less than 0, or a value far exceeding the normal range of the cell, it may be determined that the cell voltage is an abnormal value. Under the condition that the latest monomer voltage is an abnormal value, the abnormal connection of the mining line is determined, and then the result of the mining line is determined to be a fault. Under the condition that the latest monomer voltage is abnormal, the connection of the mining line is determined to be normal, and then the result of the mining line is determined to be normal.
And S206, under the condition that the voltage sampling line result is normal, determining the voltage differences between the single voltages of the single batteries in the previous second preset time period relative to the single voltages acquired at the previous moments respectively.
Specifically, under the condition that the sampling line result is normal, the sampling lines in the battery pack to be tested can be determined to be normally connected, and the single voltage obtained by sampling is credible. After the line sampling result is normal each time, a sliding window algorithm is adopted to update the window range of the voltage data, and then the voltage difference between the single voltage of the single battery in the previous second preset time period relative to the single voltage collected at each moment is determined according to the single voltage in the window range.
The cell voltages of the individual cells in the battery pack to be tested are collected at second time intervals, which is assumed to be 0.1 seconds. Taking a single battery as an example, after the result of the voltage acquisition line is determined to be normal, updating a window of voltage data by utilizing a sliding window algorithm, removing the single voltage acquired 0.1 seconds before the second preset time period, and increasing the latest acquired single voltage. Sequentially at m times t in the previous second preset time period 1 、t 2 ，…，t m-1 、t m The single voltage V at the two ends of the single battery is respectively collected 1 、V 2 ，…，V m-1 、V m When the voltage differences between the cell voltages of the cells in the previous second preset time period are respectively relative to the cell voltages collected at the previous times, the voltage differences V between the mth cell voltage in the previous second preset time period and the previous m-1 cell voltages are needed to be calculated 1 -V m 、V 2 -V m ，…，V m-1 -V m Calculating the voltage difference V of the m-1 th monomer voltage relative to the m-2 th monomer voltage in the second preset time period 1 -V m-1 、V 2 -V m-1 ，…，V m-2 -V m-1 Similarly, the voltage difference V of the 2 nd monomer voltage relative to the 1 st monomer voltage in the second preset time period before the final calculation 1 -V 2 . According to the method, the voltage differences between the cell voltages of all the cells in the battery pack to be tested in the previous second preset time period relative to the cell voltages collected at the previous moments are determined in sequence.
S207, determining a voltage value result of the battery pack to be tested according to the relative relation between the voltage difference and a preset voltage difference threshold.
Specifically, the voltage value result refers to a determination result that can indicate whether the cell voltage is within a normal range. The preset differential pressure threshold is a differential pressure threshold determined according to the maximum voltage drop which can be generated by the normal single battery in the second preset time period, and the preset differential pressure threshold can be set according to thermal runaway experimental data or empirical data. And (3) according to the determination result of the step (S206), comparing the voltage difference in the battery pack to be tested with a preset voltage difference threshold value, judging whether the voltage difference exceeds the preset voltage difference threshold value, and further determining the voltage value result of the battery pack to be tested according to the judgment result. In an exemplary embodiment, the voltage value of the battery pack to be tested is determined to be faulty when the at least one voltage difference exceeds a preset voltage difference threshold. And under the condition that the voltage difference is below a preset voltage difference threshold value, determining that the voltage value result of the battery pack to be tested is normal.
It should be noted here that, since the acquisition frequencies of the temperature data and the voltage data may be different, after determining the corresponding detection result according to the update of one of the data, the corresponding detection result may follow the previous detection result of the other data since the other data may not be updated. For example, the temperature data is collected once in 1 second and the voltage data is collected once in 0.1 second, so that if a new voltage detection result is updated and determined, whether a thermal runaway fault occurs can be judged according to the previous temperature rise detection result and the current voltage detection result. In addition, the detection frequency of the daisy-chain communication may coincide with the detection frequency of the voltage data.
S208, detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected.
S209, under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault.
Steps S208 and S209 are the same as the foregoing one-to-one correspondence of steps S104 and S105, and are not described here again.
In the thermal runaway diagnosis method of the battery provided by the embodiment, after the battery management system is electrified, the monomer temperature of the single battery is collected once at intervals of a first time; after the monomer temperature is collected each time, determining the temperature rise value of the monomer battery in each first time interval in a first preset time period; and further, according to the relative relation between the temperature rise value and the preset temperature rise threshold value, determining the temperature rise detection result of the battery pack to be detected. After the battery management system is electrified, collecting the monomer voltage of the single battery at intervals of a second time; after each single voltage acquisition, determining the acquisition line result of the battery pack to be tested according to the latest single voltage; under the condition that the result of the voltage acquisition line is normal, determining the voltage difference between the single voltages of the single batteries in the previous second preset time period relative to the single voltages acquired at the previous moments respectively; according to the relative relation between the voltage difference and the preset voltage difference threshold value, the voltage value result of the battery pack to be tested is determined, finally, under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be tested are all faults, the battery pack to be tested is determined to have a thermal runaway fault, and the thermal runaway diagnosis of the battery is realized.
Embodiments of the present invention also provide a thermal runaway diagnosis apparatus for a battery, which may be integrated into a battery management system, and may perform the thermal runaway diagnosis method for a battery of any one of the foregoing, and modifications, combinations, sub-combinations, and alternatives thereof. Fig. 3 is a schematic diagram illustrating a thermal runaway diagnosis apparatus for a battery according to an embodiment of the present invention, and referring to fig. 3, a thermal runaway diagnosis apparatus 300 for a battery includes an acquisition module 301, a temperature rise result determination module 302, a voltage result determination module 303, a communication result determination module 304, and a thermal runaway fault determination module 305. The acquisition module 301 is configured to acquire temperature data and voltage data of a battery pack to be tested after the battery management system is powered on. The temperature rise result determining module 302 is configured to determine a temperature rise detection result of the battery pack to be tested according to the temperature data. The voltage result determining module 303 is configured to determine a voltage detection result of the battery pack to be tested according to the voltage data. The communication result determining module 304 is configured to detect a communication detection result of the daisy chain communication corresponding to the battery to be tested. The thermal runaway fault determination module 305 determines that a thermal runaway fault has occurred in the battery pack to be tested in the case where the temperature rise detection result, the communication detection result, and the voltage detection result in the battery pack to be tested are all faults.
The thermal runaway diagnosis device for the battery provided by the embodiment acquires temperature data and voltage data of the battery pack to be tested after the battery management system is electrified. And determining a temperature rise detection result of the battery pack to be detected according to the temperature data. And determining a voltage detection result of the battery pack to be detected according to the voltage data. And detecting a communication detection result of the daisy chain communication corresponding to the battery pack to be detected. And under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault. The detection results of the daisy chain communication are combined on the basis of the voltage and the temperature, so that the fluctuation of the voltage and the temperature in the thermal runaway fault is considered, the communication interruption of the daisy chain communication in the thermal runaway fault is combined, the reliable diagnosis of the thermal runaway fault is realized, and as the variation trend of the daisy chain communication, the voltage and the temperature is the same when different battery packs to be detected generate the thermal runaway, the diagnosis mode can be applied to different battery application scenes, and the compatibility degree of the diagnosis method and the stability of the battery packs are improved.
The embodiment of the invention also provides electronic equipment. Fig. 4 shows a schematic diagram of the structure of an electronic device that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 4, the electronic device 410 includes at least one processor 411, and a memory, such as a Read Only Memory (ROM) 412, a Random Access Memory (RAM) 413, etc., communicatively connected to the at least one processor 411, wherein the memory stores computer programs executable by the at least one processor, and the processor 411 may perform various suitable actions and processes according to the computer programs stored in the Read Only Memory (ROM) 412 or the computer programs loaded from the storage unit 418 into the Random Access Memory (RAM) 413. In the RAM 413, various programs and data required for the operation of the electronic device 410 may also be stored. The processor 411, the ROM 412, and the RAM 413 are connected to each other through a bus 414. An input/output (I/O) interface 415 is also connected to bus 414.
Various components in the electronic device 410 are connected to the I/O interface 415, including: an input unit 416 such as a keyboard, a mouse, etc.; an output unit 417 such as various types of displays, speakers, and the like; a storage unit 418, such as a magnetic disk, optical disk, or the like; and a communication unit 419 such as a network card, modem, wireless communication transceiver, etc. The communication unit 419 allows the electronic device 410 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The processor 411 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 411 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 411 performs the respective methods and processes described above, for example, a thermal runaway diagnosis method of any one of the batteries in the embodiment of the present invention.
In some embodiments, the thermal runaway diagnostic method of the battery may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 418. In some embodiments, some or all of the computer program may be loaded and/or installed onto the electronic device 410 via the ROM 412 and/or the communication unit 419. When the computer program is loaded into the RAM 413 and executed by the processor 411, one or more steps of the thermal runaway diagnosis method of the battery described above may be performed. Alternatively, in other embodiments, the processor 411 may be configured to perform a thermal runaway diagnostic method of the battery in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A thermal runaway diagnosis method of a battery, characterized by comprising:
after the battery management system is electrified, acquiring temperature data and voltage data of the battery pack to be tested;
determining a temperature rise detection result of the battery pack to be detected according to the temperature data;
determining a voltage detection result of the battery pack to be detected according to the voltage data;
detecting a communication detection result of daisy chain communication corresponding to the battery pack to be detected;
And under the condition that the temperature rise detection result, the communication detection result and the voltage detection result in the battery pack to be detected are all faults, determining that the battery pack to be detected has a thermal runaway fault.
2. The thermal runaway diagnosis method of a battery according to claim 1, wherein the voltage detection result includes a line-sampling result and a voltage value result, and the voltage detection result is a fault in the case where the line-sampling result and/or the voltage value result is a fault.
3. The thermal runaway diagnosis method of a battery according to claim 1 or 2, wherein the temperature data includes a cell temperature of a cell;
after the battery management system is electrified, collecting temperature data and voltage data of the battery pack to be tested, including:
after the battery management system is electrified, acquiring the monomer temperature of the monomer battery once at intervals of a first time;
and determining a temperature rise detection result of the battery pack to be detected according to the temperature data, wherein the temperature rise detection result comprises:
after the monomer temperature is collected each time, determining a temperature rise value of the monomer battery in each first time interval in a first preset time period;
And determining a temperature rise detection result of the battery pack to be detected according to the relative relation between the temperature rise value and a preset temperature rise threshold value.
4. The method for diagnosing thermal runaway of a battery according to claim 3, wherein said determining a temperature rise detection result of said battery pack to be tested according to a relative relation between said temperature rise value and a preset temperature rise threshold value comprises:
under the condition that at least one temperature rise value exceeds the preset temperature rise threshold value, determining that the temperature rise detection result of the battery pack to be detected is a fault;
and under the condition that the Wen Shengzhi is below the preset temperature rise threshold, determining that the temperature rise detection result of the battery pack to be detected is normal.
5. The thermal runaway diagnosis method of a battery according to claim 2, wherein the voltage data includes a cell voltage of a cell;
after the battery management system is electrified, collecting temperature data and voltage data of the battery pack to be tested, including:
after the battery management system is electrified, collecting the single voltage of the single battery at intervals of a second time;
and determining a voltage detection result of the battery pack to be detected according to the voltage data, wherein the voltage detection result comprises the following steps:
After each time of acquisition of the single voltage, determining the acquisition line result of the battery pack to be tested according to the latest single voltage;
under the condition that the voltage sampling line result is normal, determining voltage differences between the single voltages of the single batteries in a previous second preset time period relative to the single voltages acquired at previous moments respectively;
and determining the voltage value result of the battery pack to be tested according to the relative relation between the voltage difference and a preset voltage difference threshold value.
6. The method according to claim 5, wherein the determining the line voltage sampling result of the battery pack to be tested based on the latest cell voltage after each time of the cell voltage sampling includes:
judging whether the latest monomer voltage is invalid data or not;
under the condition that the latest monomer voltage is the invalid data, determining that the sampling line result is a fault;
and under the condition that the latest monomer voltage is the invalid data, determining that the sampling line result is normal.
7. The method according to claim 5, wherein the determining the voltage value result of the battery pack to be tested according to the relative relationship between the voltage difference and a preset voltage difference threshold value comprises:
Under the condition that at least one voltage difference exceeds the preset voltage difference threshold value, determining that the voltage value result of the battery pack to be tested is a fault;
and under the condition that the voltage difference is below the preset voltage difference threshold value, determining that the voltage value result of the battery pack to be tested is normal.
8. A thermal runaway diagnostic device of a battery, comprising:
the acquisition module is used for acquiring temperature data and voltage data of the battery pack to be tested after the battery management system is electrified;
the temperature rise result determining module is connected with the sampling module and is used for determining a temperature rise detection result of the battery pack to be detected according to the temperature data;
the voltage result determining module is connected with the sampling module and is used for determining a voltage detection result of the battery pack to be detected according to the voltage data;
the communication result determining module is respectively connected with the temperature rise result determining module and the voltage result determining module and is used for detecting a communication detection result of daisy chain communication corresponding to the battery pack to be detected;
and the thermal runaway fault determining module is connected with the communication result determining module and is used for determining that the thermal runaway fault occurs in the battery pack to be tested under the condition that the temperature rise detecting result, the communication detecting result and the voltage detecting result in the battery pack to be tested are all faults.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the thermal runaway diagnostic method of a battery of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to execute the thermal runaway diagnostic method of the battery of any one of claims 1-7.
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| CN202311804398.XA CN117783914A (en) | 2023-12-25 | 2023-12-25 | Method, device, equipment and storage medium for diagnosing thermal runaway of battery |
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