Battery expansion force detection method and system and storage medium

Abstract

The invention relates to a battery expansion force detection method and system and a storage medium. The method comprises the following steps: acquiring current feature data and current expansion force of a to-be-detected battery module; querying a preset data table according to the current feature data to obtain a target expansive force; and when the current expansion force and the target expansion force meet a preset early warning condition, controlling the to-be-detected battery module to enter an early warning protection state so as to accurately detect the expansion force of the battery and generate early warning protection in real time according to the expansion force of the battery. According to the method, the characteristic data and the expansion force of the to-be-detected battery module are detected in real time, the target expansion force corresponding to the current characteristic data is obtained in a table look-up mode, and then whether early warning protection is triggered or not is judged according to the current expansion force and the target expansion force, so that early warning of thermal runaway is achieved in advance, and the safety of thermal runaway is improved. The battery expansion force detection error of the battery management system is reduced, the expansion state of the battery is reflected in time, the thermal runaway early warning accuracy is improved, and the safety of the battery module is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery expansion force detection method, system, and storage medium. Background Art

[0002] The battery management system (BMS) is the core control unit of the battery module, responsible for monitoring, protecting, and optimizing battery performance and ensuring safe operation. It monitors battery parameters such as voltage, current, and temperature to prevent abnormal conditions such as overcharging, over-discharging, short circuits, and overheating, triggering alarms or shutting down the circuit to avoid danger.

[0003] At present, in the existing battery management system, the battery management system has a large error in detecting the battery expansion force and cannot reflect the battery expansion status in a timely manner, resulting in low accuracy of thermal runaway warning. Summary of the Invention

[0004] Based on this, a battery expansion force detection method, system and storage medium are provided.

[0005] In a first aspect, the present application provides a method for detecting battery expansion force, comprising the following steps:

[0006] Obtain the current characteristic data and current expansion force of the battery module to be tested;

[0007] According to the current characteristic data, the preset data table is queried to obtain the target expansion force;

[0008] When the current expansion force and the target expansion force meet the preset warning conditions, the battery module to be tested is controlled to enter a warning protection state.

[0009] In one embodiment, before the step of querying a preset data table based on current characteristic data to obtain a target expansion force, the step includes:

[0010] Acquire multiple historical characteristic data and multiple historical expansion forces of the test battery module at corresponding collection time points;

[0011] According to each historical characteristic data and each historical expansion force, a preset data table is established.

[0012] In one embodiment, when the current expansion force and the target expansion force meet a preset warning condition, the step of controlling the battery module to be tested to enter a warning protection state includes:

[0013] Performing ratio processing on the current expansion force and the target expansion force to obtain an expansion force ratio;

[0014] When the expansion force ratio is greater than or equal to a first threshold value and less than a second threshold value, reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested;

[0015] When the expansion force ratio is greater than or equal to a second threshold, the power supply circuit of the battery module to be tested is cut off.

[0016] In one embodiment, when the current expansion force and the target expansion force meet a preset warning condition, the step of controlling the battery module to be tested to enter a warning protection state further includes:

[0017] When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, a first warning is triggered;

[0018] When the expansion force ratio is greater than or equal to the second threshold, a second warning is triggered.

[0019] In one embodiment, when the expansion force ratio is greater than or equal to a first threshold value and less than a second threshold value, the step of reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested includes:

[0020] When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, triggering the first timing;

[0021] When the first timing duration reaches a first time threshold and the expansion force ratio is greater than or equal to the first threshold and less than a second threshold, the charging current of the battery module to be tested is reduced and / or the heat dissipation power of the battery module to be tested is increased.

[0022] In one embodiment, when the expansion force ratio is greater than or equal to a second threshold, the step of cutting off the power supply circuit of the battery module to be tested includes:

[0023] When the expansion force ratio is greater than or equal to a second threshold, triggering a second timing;

[0024] When the second timing duration reaches a second time threshold and the expansion force ratio is greater than or equal to the second threshold, the power supply circuit of the battery module to be tested is cut off.

[0025] In one embodiment, the current characteristic data includes current temperature data, current current data, and current voltage data;

[0026] The steps of querying a preset data table based on current characteristic data to obtain a target expansion force include:

[0027] According to the current temperature data, the current current data and the current voltage data, the preset data table is queried to obtain the target expansion force.

[0028] In a second aspect, the present application further provides a battery expansion force detection system, comprising an expansion force detection module, a sensor module, and a processing module, wherein the expansion force detection module and the sensor module are respectively connected to the processing module; the expansion force detection module is disposed at one end of a battery module to be tested, and is used to detect the current expansion force of the battery module to be tested; the sensor module is disposed at the battery module to be tested, and is used to detect current characteristic data of the battery module to be tested;

[0029] The processing module is used to execute the steps of any one of the above-mentioned battery expansion force detection methods.

[0030] In one embodiment, the processing module includes a processor, a signal processing module, and a power supply control module; the sensing module includes a voltage sensing module, a current sensing module, and a temperature sensing module; the voltage sensing module and the current sensing module are arranged at the electrode end of the battery module to be tested, and the temperature sensing module is arranged adjacent to the tab of the battery module to be tested;

[0031] The expansion force detection module, voltage sensing module, current sensing module and temperature sensing module are respectively connected to the signal processing module, and the signal processing module is connected to the processor; the processor is connected to the power supply control module, and the power supply control module is connected to the battery module to be tested; the processor is also used to connect to the heat dissipation module, and the heat dissipation module is used to dissipate heat for the battery module to be tested.

[0032] In a third aspect, the present application further provides a computer storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the above-mentioned battery expansion force detection methods are implemented.

[0033] One of the above technical solutions has the following advantages and beneficial effects:

[0034] In the above-mentioned battery expansion force detection method, the current characteristic data and current expansion force of the battery module to be tested are obtained; based on the current characteristic data, a preset data table is queried to obtain a target expansion force; and when the current expansion force and the target expansion force meet the preset warning conditions, the battery module to be tested is controlled to enter a warning protection state, thereby accurately detecting the battery expansion force and generating a warning protection in real time based on the battery expansion force. This application detects the characteristic data and expansion force of the battery module to be tested in real time, obtains the target expansion force corresponding to the current characteristic data through a table lookup, and then determines whether to trigger the warning protection based on the current expansion force and the target expansion force, thereby providing an early warning of thermal runaway. This reduces the battery management system's error in battery expansion force detection, enables timely reflection of the battery's expansion state, improves the accuracy of thermal runaway warnings, and enhances the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1Schematic diagram of the application environment of the battery expansion force detection method in an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of a first flow chart of a battery expansion force detection method according to an embodiment of the present application;

[0037] Figure 3 This is a first flow chart of the expansion force early warning protection processing steps in the embodiment of the present application;

[0038] Figure 4 This is a second flow chart of the expansion force early warning protection processing step in the embodiment of the present application;

[0039] Figure 5 This is a first flow chart of the expansion force warning extension processing step in an embodiment of the present application;

[0040] Figure 6 This is a second flow chart of the expansion force warning extension processing step in the embodiment of the present application;

[0041] Figure 7 This is a schematic diagram of the structural connection of a battery expansion force detection system in an embodiment of the present application;

[0042] Figure 8 This is a structural diagram of the installation structure of the expansion force detection module in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Additionally, the term "plurality" shall mean two or more.

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] The battery expansion force detection method provided in this application can be applied to Figure 1 In the application environment shown, the battery expansion force detection system includes a processing module 100, an expansion force detection module 200, and a sensor module 300. The expansion force detection module 200 and the sensor module 300 are respectively connected to the processing module 100. The expansion force detection module 200 is disposed at one end of the battery module under test and is used to detect the current expansion force of the battery module under test. The sensor module 300 is disposed at the battery module under test and is used to detect the current characteristic data of the battery module under test. The processing module 100 includes a processor and a memory. The processor is connected to the memory, and the memory is used to store information such as current characteristic data, current expansion force, a preset data table, and a target expansion force. The processor is used to obtain the current characteristic data and current expansion force of the battery module under test; based on the current characteristic data, it queries the preset data table to obtain the target expansion force; and when the current expansion force and the target expansion force meet preset warning conditions, the battery module under test is controlled to enter a warning protection state. The processing module 100 may further include a display that can display information such as current characteristic data, current expansion force, preset data table, and target expansion force through a graphical interface. For example, the battery expansion force detection system may be a battery management system (BMS).

[0048] In one embodiment, Figure 2 As shown, a battery expansion force detection method is also provided, comprising the following steps:

[0049] Step S210: Obtain current characteristic data and current expansion force of the battery module to be tested.

[0050] Among them, the battery module to be tested is a lithium battery module, for example, the battery module to be tested includes multiple single cells, each single cell can be connected in series and / or in parallel, each single cell can be arranged in multiple rows and columns (such as multiple rows and one column), the single cell can be a square battery, and an isolation member is provided between two adjacent single cells. The first end of the battery module to be tested is provided with a first end plate, and the second end of the battery module to be tested is provided with a second end plate. The first end plate, the second end plate and each single cell are fixed by a fastening belt.

[0051] The current characteristic data refers to the battery characteristic data of the battery module under test. For example, the current characteristic data may be the temperature characteristic data and the electrical parameter characteristic data of the battery module under test. For example, a sensor module may be provided in the battery module under test, connected to a processor, and perform characteristic detection on the battery module under test to obtain the corresponding current characteristic data.

[0052] The current expansion force can be calculated based on the deformation data of the battery module under test. For example, an expansion force detection module can be installed in the battery module under test to detect the deformation of the battery module's housing, thereby converting the deformation data. This deformation data is then converted and processed to obtain the current expansion force of the battery module under test. It should be noted that the expansion force detection module can be a deformation sensing module.

[0053] Step S220: According to the current characteristic data, query the preset data table to obtain the target expansion force.

[0054] The target expansion force refers to the theoretical expansion force value corresponding to the current characteristic data. A preset data table can be established based on historical test data. For example, a test battery module is tested based on different characteristic data and expansion forces to obtain historical characteristic data and historical expansion forces. Based on these historical characteristic data and historical expansion forces, a preset data table is then established. It should be noted that the model of the test battery module is the same as the model of the battery module to be tested.

[0055] The processor queries a preset data table based on the current characteristic data to obtain the target expansion force of the battery module to be tested.

[0056] Step S230: When the current expansion force and the target expansion force meet a preset warning condition, the battery module to be tested is controlled to enter a warning protection state.

[0057] The preset warning condition may be obtained according to a system preset, for example, the preset warning condition may be whether the expansion force difference or the expansion force ratio exceeds a corresponding preset threshold.

[0058] For example, the processor can process the current expansion force and the target expansion force, and compare the processing results with the preset warning conditions. When the current expansion force and the target expansion force meet the preset warning conditions, it determines that the battery module to be tested has a thermal runaway warning, and then controls the battery module to be tested to enter a warning protection state, thereby achieving early warning of thermal runaway of the battery module to be tested, and taking early warning protection measures in time, thereby improving the safety of the battery module to be tested.

[0059] In the aforementioned embodiment, the current characteristic data and current expansion force of the battery module under test are obtained; based on the current characteristic data, a preset data table is queried to obtain a target expansion force; and when the current expansion force and the target expansion force meet preset warning conditions, the battery module under test is controlled to enter a warning protection state, thereby accurately detecting the battery expansion force and generating a warning protection in real time based on the battery expansion force. The present application performs real-time detection of the characteristic data and expansion force of the battery module under test, obtains the target expansion force corresponding to the current characteristic data through a table lookup, and then determines whether to trigger a warning protection based on the current expansion force and the target expansion force, thereby providing early warning of thermal runaway. This reduces the battery management system's error in detecting battery expansion force, enables timely reflection of the battery's expansion status, improves the accuracy of thermal runaway warnings, and enhances the safety of the battery module.

[0060] In one embodiment, before the step of querying a preset data table based on current characteristic data to obtain a target expansion force, the step includes:

[0061] A plurality of historical characteristic data and a plurality of historical expansion forces of the test battery module at corresponding collection time points are obtained; and a preset data table is established based on each historical characteristic data and each historical expansion force.

[0062] Corresponding historical characteristic data and historical expansion forces are present at the same collection time point. For example, multiple historical characteristic data at different collection time points can be pre-set, and based on these multiple historical characteristic data at different collection time points, expansion force testing can be performed on the test battery module to obtain the corresponding historical expansion force. Another example is that multiple historical expansion forces at different collection time points can be pre-set, and based on these multiple historical expansion forces at different collection time points, characteristic data detection can be performed on the test battery module to obtain the corresponding historical characteristic data.

[0063] By performing characteristic data and expansion force tests on the test battery module, multiple historical characteristic data and multiple historical expansion forces of the test battery module at corresponding collection time points are obtained; abnormal data filtering is performed on each historical characteristic data and each historical expansion force to eliminate abnormal data, and a preset data table is established based on the filtered historical characteristic data and each historical expansion force. When the expansion force test is performed on the battery module to be tested, the target expansion force corresponding to the current characteristic data can be obtained by looking up the table. Then, based on the current expansion force and the target expansion force, it is determined whether to trigger the early warning protection, thereby improving the accuracy of the thermal runaway early warning, reducing the error of the battery management system in detecting the battery expansion force, and realizing timely reflection of the battery's expansion status.

[0064] In one embodiment, Figure 3 As shown, when the current expansion force and the target expansion force meet the preset warning conditions, the steps of controlling the battery module to be tested to enter the warning protection state include:

[0065] Step S310: performing ratio processing on the current expansion force and the target expansion force to obtain an expansion force ratio.

[0066] The expansion force ratio is a value greater than 0. The processor divides the current expansion force by the target expansion force to obtain the expansion force ratio, so that in subsequent steps, it can be used to determine whether the battery module under test triggers early warning protection based on the expansion force ratio.

[0067] Step S320: When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested.

[0068] The first threshold is smaller than the second threshold. For example, the first threshold may be set to 1.5, and the second threshold may be set to 2.

[0069] For example, the processor compares the expansion force ratio with the thresholds (first threshold and second threshold). When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, it determines that the expansion force of the battery module to be tested is too large and issues an alarm, thereby reducing the charging current of the battery module to be tested or increasing the heat dissipation power of the battery module to be tested, thereby increasing the system linkage capability, and optimizing the charge and discharge strategy of the battery module to be tested in combination with the expansion force data, thereby extending the service life of the battery module to be tested. For another example, when the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, the charging current of the battery module to be tested is reduced, and the heat dissipation power of the battery module to be tested is increased to reduce the heat generated during the charging process, and the battery module to be tested is forced to dissipate heat, thereby improving the heat dissipation effect of the battery module to be tested and preventing the expansion force of the battery module to be tested from continuing to increase. In addition, by dynamically adjusting the charge and discharge strategy, mechanical stress damage is reduced and the safety of the battery module to be tested is improved.

[0070] Step S330: When the expansion force ratio is greater than or equal to a second threshold, cutting off the power supply circuit of the battery module to be tested.

[0071] The power supply circuit of the battery module to be tested refers to the charge and discharge circuit of the battery module to be tested.

[0072] The processor compares the expansion force ratio with thresholds (a first threshold and a second threshold). When the expansion force ratio is greater than or equal to the second threshold, the processor determines that the expansion force of the battery module under test is excessive, and then cuts off the power supply circuit of the battery module under test, thereby accurately providing a thermal runaway warning for the battery module under test. For example, when the expansion force ratio is greater than or equal to the second threshold, the power supply circuit of the battery module under test is cut off, and forced heat dissipation of the battery module under test is initiated to quickly reduce the temperature of the battery module under test, prevent thermal runaway of the battery module under test, and thus improve the reliability and safety of the battery module under test.

[0073] In one embodiment, Figure 4 As shown, when the current expansion force and the target expansion force meet the preset warning condition, the step of controlling the battery module to be tested to enter the warning protection state further includes:

[0074] Step S410: When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, trigger a first warning.

[0075] The first warning may be a sound warning based on a first sound frequency or a light warning based on a first flashing frequency.

[0076] For example, the processor compares the expansion force ratio with the threshold values ​​(a first threshold value and a second threshold value). When the expansion force ratio is greater than or equal to the first threshold value and less than the second threshold value, it determines that the expansion force of the battery module to be tested is too large and an alarm is issued, thereby triggering the first warning. At the same time, the charging current of the battery module to be tested is reduced and / or the heat dissipation power of the battery module to be tested is increased, so as to promptly remind the user of the current usage status of the battery module to be tested. At the same time, the charging and discharging strategy of the battery module to be tested is dynamically adjusted according to the battery expansion force status, thereby reducing mechanical stress damage and improving the service life of the battery module to be tested.

[0077] Step S420: When the expansion force ratio is greater than or equal to a second threshold, a second warning is triggered.

[0078] The second warning may be a sound warning based on a second sound frequency or a light warning based on a second flashing frequency, wherein the second sound frequency is greater than the first sound frequency, and the second flashing frequency is greater than the first flashing frequency.

[0079] For example, the processor compares the expansion force ratio with the threshold values ​​(a first threshold value and a second threshold value). When the expansion force ratio is greater than or equal to the second threshold value, it determines that the expansion force of the battery module to be tested is excessive, thereby triggering a second warning and simultaneously cutting off the power supply circuit of the battery module to be tested, so as to timely cut off the circuit and remind the user of the current usage status of the battery module to be tested, thereby avoiding thermal runaway of the battery module to be tested, thereby improving the reliability and safety of the battery module to be tested and increasing the service life of the battery module to be tested.

[0080] In one embodiment, Figure 5 As shown, when the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, the step of reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested includes:

[0081] Step S510: When the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, trigger the first timing.

[0082] For example, the processor compares the expansion force ratio with the thresholds (first threshold and second threshold), and when the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, triggers the first timing, and then accumulates the duration of the first timing.

[0083] Step S520: When the first timing duration reaches a first time threshold and the expansion force ratio is greater than or equal to the first threshold and less than a second threshold, reduce the charging current of the battery module to be tested and / or increase the heat dissipation power of the battery module to be tested.

[0084] The processor compares the duration of the first timer with a first time threshold. Based on the comparison result, if the first timer reaches the first time threshold and the expansion force ratio is greater than or equal to the first threshold and less than the second threshold, the processor determines that the expansion force of the battery module under test is excessive and issues an alarm. The processor then reduces the charging current of the battery module under test and / or increases the heat dissipation power of the battery module under test, thereby improving the heat dissipation effect of the battery module under test, preventing further increase in the expansion force of the battery module under test, and improving the safety of the battery module under test. Furthermore, by setting different protection timers, the most appropriate parameter combination can be determined, enabling the system to respond promptly when an anomaly is detected while avoiding false triggering. A reasonable timer ensures the effective duration of the protection measures, preventing the problem from recurring, thereby reducing the risk of misoperation and improving the reliability of the battery module under test.

[0085] In one example, when the expansion force ratio is less than a first threshold, the duration of the first timing is reset to zero so as to perform the next expansion force monitoring on the battery pack to be tested.

[0086] In one embodiment, Figure 6 As shown, when the expansion force ratio is greater than or equal to the second threshold, the step of cutting off the power supply circuit of the battery module to be tested includes:

[0087] Step S610: When the expansion force ratio is greater than or equal to a second threshold, trigger a second timing.

[0088] For example, the processor compares the expansion force ratio with the thresholds (the first threshold and the second threshold), and when the expansion force ratio is greater than or equal to the second threshold, triggers the second timing, and then accumulates the duration of the second timing.

[0089] Step S620: When the second timing duration reaches a second time threshold and the expansion force ratio is greater than or equal to the second threshold, cutting off the power supply circuit of the battery module to be tested.

[0090] The second time threshold may be set to be less than or equal to the first time threshold.

[0091] The processor compares the duration of the second timing with the second time threshold, and based on the comparison result, when the duration of the second timing reaches the second time threshold and the expansion force ratio is greater than or equal to the second threshold, it is determined that the expansion force of the battery module to be tested is excessive and protection is triggered, thereby cutting off the power supply circuit of the battery module to be tested to prevent thermal runaway of the battery module to be tested. In addition, by setting an appropriate protection duration, short-term fluctuations or interference signals can be filtered out, avoiding frequent unnecessary alarms and protection, thereby improving the reliability and safety of the battery module to be tested and increasing the service life of the battery module to be tested.

[0092] In one example, when the expansion force ratio is less than the second threshold, the duration of the second timing is reset to zero so as to perform the next expansion force monitoring on the battery pack to be tested.

[0093] In one embodiment, the current characteristic data includes current temperature data, current current data, and current voltage data. The steps of querying a preset data table based on the current characteristic data to obtain the target expansion force include:

[0094] According to the current temperature data, the current current data and the current voltage data, the preset data table is queried to obtain the target expansion force.

[0095] The sensing module may include a temperature sensor, a voltage sensor, and a current sensor. The temperature sensor is used to detect the surface temperature signal of the battery module to be tested, and filters, amplifies, and performs ADC conversion processing on the detected surface temperature signal to obtain the current temperature data; the voltage sensor is used to detect the voltage signal of the battery module to be tested, and filters, amplifies, and performs ADC conversion processing on the detected voltage signal to obtain the current voltage data; the current sensor is used to detect the current signal of the battery module to be tested, and filters, amplifies, and performs ADC conversion processing on the detected current signal to obtain the current current data.

[0096] For example, the expansion force detection module is used to test the expansion force of a test battery module under varying voltage, current, and temperature conditions. This ensures that all test data (temperature, voltage, current, and expansion force) are collected at the same time point, and abnormal data is eliminated to form a preset data table. The processor queries the preset data table based on the current temperature, current, and voltage data obtained to determine the target expansion force of the battery module under test.

[0097] It should be understood that although Figures 2 to 6 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figures 2 to 6At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0098] In one embodiment, a battery expansion force detection device is provided, comprising:

[0099] The data acquisition unit is used to obtain the current characteristic data and current expansion force of the battery module to be tested.

[0100] The table lookup unit searches a preset data table according to the current characteristic data to obtain the target expansion force.

[0101] The expansion force processing unit controls the battery module to be tested to enter a warning protection state when the current expansion force and the target expansion force meet the preset warning conditions.

[0102] The specific definitions of the battery expansion force detection device can be found in the definitions of the battery expansion force detection method above and will not be further elaborated here. Each module in the aforementioned battery expansion force detection device can be implemented in whole or in part via software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of the equalization control module in the battery expansion force detection system in hardware form, or stored in memory within the battery expansion force detection system in software form, allowing the processor to call and execute the corresponding operations of each module.

[0103] In one embodiment, Figure 1 and Figure 8 As shown, a battery expansion force detection system is also provided, including an expansion force detection module 200, a sensor module 300 and a processing module 100. The expansion force detection module 200 and the sensor module 300 are respectively connected to the processing module 100. The expansion force detection module 200 is arranged at one end of the battery module 400 to be tested, and the expansion force detection module 200 is used to detect the current expansion force of the battery module 400 to be tested. The sensor module 300 is arranged on the battery module 400 to be tested, and the sensor module 300 is used to detect the current characteristic data of the battery module 400 to be tested. The processing module 100 is used to execute the steps of any of the above-mentioned battery expansion force detection methods.

[0104] For example, the battery module 400 to be tested includes a first end plate, a second end plate and a battery pack, the battery pack is arranged between the first end plate and the second end plate, and the battery pack is clamped between the first end plate and the second end plate by a fastening belt. The expansion force detection module 200 can be a deformation sensor, and the expansion force detection module 200 can be arranged between the first end plate of the battery module 400 to be tested and the first end of the battery pack. The expansion force detection module 200 can detect the deformation generated in the corresponding direction of the battery module 400 to be tested, and then obtain the current expansion force. The sensor module 300 can be arranged on the top surface of the battery module 400 to be tested, and the sensor module 300 is used to detect the current characteristic data of the battery module 400 to be tested. Among them, please refer to the description of the above embodiment for the specific description of the processing module 100, which will not be repeated here.

[0105] The sensing module 300 detects the current characteristic data of the battery module 400 under test in real time and transmits the detected current characteristic data to the processing module 100. The expansion force detection module 200 detects the current expansion force of the battery module 400 under test in real time and transmits the detected current expansion force to the processing module 100. The processing module 100 obtains the current characteristic data and current expansion force of the battery module 400 under test and queries a preset data table based on the current characteristic data to obtain a target expansion force. When the current expansion force and the target expansion force meet the preset warning conditions, the processing module 100 controls the battery module 400 under test to enter a warning protection state, thereby accurately detecting the battery expansion force and generating a real-time warning protection based on the battery expansion force. The present application performs real-time detection on the characteristic data and expansion force of the battery module 400 to be tested, obtains the target expansion force corresponding to the current characteristic data by table lookup, and then determines whether to trigger the early warning protection based on the current expansion force and the target expansion force, thereby realizing early warning of thermal runaway, reducing the error of the battery management system in detecting the battery expansion force, realizing timely reflection of the battery's expansion status, improving the accuracy of the thermal runaway warning, and enhancing the safety of the battery module.

[0106] In one embodiment, Figure 7 and Figure 8As shown, the processing module 100 includes a processor 102, a signal processing module 104 and a power supply control module 106; the sensing module 300 includes a voltage sensing module 302, a current sensing module 304 and a temperature sensing module 306; the voltage sensing module 302 and the current sensing module 304 are arranged at the electrode end of the battery module 400 to be tested, and the temperature sensing module 306 is arranged adjacent to the electrode ear of the battery module 400 to be tested; the expansion force detection module 200, the voltage sensing module 302, the current sensing module 304 and the temperature sensing module 306 are respectively connected to the signal processing module 104, and the signal processing module 104 is connected to the processor 102; the processor 102 is connected to the power supply control module 106, and the power supply control module 106 is connected to the battery module 400 to be tested; the processor 102 is also used to connect to the heat dissipation module, and the heat dissipation module is used to dissipate heat from the battery module 400 to be tested.

[0107] The signal processing module 104 may include a signal filtering unit, a signal amplification unit, and an analog-to-digital conversion unit. The signal filtering unit is respectively connected to the expansion force detection module 200, the voltage sensing module 302, the current sensing module 304, and the temperature sensing module 306. The signal discharge unit is respectively connected to the signal filtering unit and the analog-to-digital conversion unit. The temperature sensing module 306 may be an NTC (thermistor) sensor and may be positioned adjacent to the tab of the battery module 400 under test to detect the temperature of the tab of the battery module 400 under test. The voltage sensing module 302 may be connected to the positive and negative terminals of the battery module 400 under test to detect the voltage of the battery module 400 under test. The current sensing module 304 may be connected to the positive and negative terminals of the battery module 400 under test to detect the current of the battery module 400 under test. The power supply control module 106 may be used to control the charge and discharge of the battery module 400 under test. The heat dissipation module may be an air-cooled heat dissipation module or a liquid-cooled heat dissipation module.

[0108] The voltage sensing module 302, current sensing module 304, temperature sensing module 306, and expansion force detection module 200 perform real-time detection on the battery module 400 under test and transmit the corresponding detected current voltage signal, current current signal, current temperature signal, and current expansion force signal to the signal processing module 104. The signal processing module 104 filters, amplifies, and performs analog-to-digital conversion on the current voltage signal, current current signal, current temperature signal, and current expansion force signal to obtain current voltage data, current current data, current temperature data, and current expansion force data, and transmits the current voltage data, current current data, current temperature data, and current expansion force data to the processor 102.

[0109] The processor 102 queries a preset data table based on the acquired current voltage data, current current data, and current temperature data to obtain a target expansion force. When the expansion force ratio is greater than or equal to a first threshold value and less than a second threshold value, the processor 102 controls the power supply control module 106 to reduce the charging current of the battery module 400 to be tested and / or controls the heat dissipation module to increase the heat dissipation power of the battery module 400 to be tested. When the expansion force ratio is greater than or equal to the second threshold value, the processor 102 controls the power supply control module 106 to cut off the power supply circuit of the battery module 400 to be tested, thereby accurately detecting the battery expansion force and providing an early warning of thermal runaway based on the battery expansion force, thereby reducing the battery management system's error in detecting the battery expansion force, timely reflecting the battery's expansion state, improving the accuracy of the thermal runaway warning, and enhancing the safety of the battery module.

[0110] In one embodiment, a computer storage medium is further provided, on which a computer program is stored, characterized in that when the computer program is executed by a processor, the steps of any one of the above-mentioned battery expansion force detection methods are implemented.

[0111] For example, when a computer program is executed by a processor, it performs the following steps:

[0112] Obtain current characteristic data and current expansion force of the battery module to be tested; query a preset data table based on the current characteristic data to obtain a target expansion force; when the current expansion force and the target expansion force meet preset warning conditions, control the battery module to be tested to enter a warning protection state.

[0113] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0114] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for detecting battery expansion force, characterized in that: The following steps are involved: Obtain the current characteristic data and current expansion force of the battery module to be tested; According to the current characteristic data, query the preset data table to obtain the target expansion force; When the current expansion force and the target expansion force meet a preset warning condition, the battery module to be tested is controlled to enter a warning protection state.

2. The battery expansion force detection method according to claim 1, characterized in that: Before the step of querying a preset data table based on the current characteristic data to obtain a target expansion force, the following steps are included: Acquire multiple historical characteristic data and multiple historical expansion forces of the test battery module at corresponding collection time points; The preset data table is established based on each of the historical characteristic data and each of the historical expansion forces.

3. The battery expansion force detection method according to claim 1, characterized in that: When the current expansion force and the target expansion force meet a preset warning condition, the step of controlling the battery module to be tested to enter a warning protection state includes: performing ratio processing on the current expansion force and the target expansion force to obtain an expansion force ratio; When the expansion force ratio is greater than or equal to a first threshold value and less than a second threshold value, reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested; When the expansion force ratio is greater than or equal to a second threshold, the power supply circuit of the battery module to be tested is cut off.

4. The battery expansion force detection method according to claim 3, characterized in that: When the current expansion force and the target expansion force meet a preset warning condition, the step of controlling the battery module to be tested to enter a warning protection state further includes: When the expansion force ratio is greater than or equal to a first threshold and less than a second threshold, a first warning is triggered; When the expansion force ratio is greater than or equal to a second threshold, a second warning is triggered.

5. The battery expansion force detection method according to claim 3, characterized in that: When the expansion force ratio is greater than or equal to a first threshold value and less than a second threshold value, the step of reducing the charging current of the battery module to be tested and / or increasing the heat dissipation power of the battery module to be tested includes: When the expansion force ratio is greater than or equal to a first threshold and less than a second threshold, triggering a first timing; When the first timing duration reaches a first time threshold and the expansion force ratio is greater than or equal to the first threshold and less than a second threshold, the charging current of the battery module to be tested is reduced and / or the heat dissipation power of the battery module to be tested is increased.

6. The battery expansion force detection method according to claim 3, characterized in that: When the expansion force ratio is greater than or equal to a second threshold, the step of cutting off the power supply circuit of the battery module to be tested includes: When the expansion force ratio is greater than or equal to a second threshold, triggering a second timing; When the second timing duration reaches a second time threshold and the expansion force ratio is greater than or equal to the second threshold, the power supply circuit of the battery module to be tested is cut off.

7. The battery expansion force detection method according to any one of claims 1 to 6, characterized in that: The current characteristic data includes current temperature data, current current data and current voltage data; The step of querying a preset data table based on the current characteristic data to obtain a target expansion force includes: According to the current temperature data, the current current data, and the current voltage data, a preset data table is queried to obtain the target expansion force.

8. A battery expansion force detection system, characterized in that: The battery module comprises an expansion force detection module, a sensor module and a processing module, wherein the expansion force detection module and the sensor module are respectively connected to the processing module; the expansion force detection module is arranged at one end of the battery module to be tested, and is used to detect the current expansion force of the battery module to be tested; the sensor module is arranged at the battery module to be tested, and is used to detect the current characteristic data of the battery module to be tested; The processing module is used to execute the steps of the battery expansion force detection method according to any one of claims 1 to 7.

9. The battery expansion force detection system according to claim 8, characterized in that: The processing module includes a processor, a signal processing module and a power supply control module; the sensing module includes a voltage sensing module, a current sensing module and a temperature sensing module; the voltage sensing module and the current sensing module are arranged at the electrode end of the battery module to be tested, and the temperature sensing module is arranged adjacent to the electrode tab of the battery module to be tested; The expansion force detection module, the voltage sensing module, the current sensing module and the temperature sensing module are respectively connected to the signal processing module, and the signal processing module is connected to the processor; the processor is connected to the power supply control module, and the power supply control module is connected to the battery module to be tested; the processor is also used to connect to the heat dissipation module, and the heat dissipation module is used to dissipate heat from the battery module to be tested.

10. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery expansion force detection method according to any one of claims 1 to 7 are implemented.

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