A battery-powered control method, apparatus, device, and medium

Abstract

The application discloses a battery power supply control method, device, equipment and medium, by setting a pressure sensor between adjacent battery cells in a battery module and / or outside the battery cells at both ends of the arrangement direction of the battery cells, real-time pressure values reflecting the internal and boundary pressure changes of the battery module are obtained, a dynamic pressure threshold is determined in combination with the current battery state parameters of the battery module, the pressure safety state of the battery module is judged according to the real-time pressure values and the dynamic pressure threshold, and the power supply state of the battery module is controlled according to the pressure safety state. That is, the application can directly perceive the mechanical pressure changes caused by the expansion of the battery cells, compared with the safety monitoring mode mainly relying on voltage, current, temperature and other electrical parameters in the prior art, the potential safety risks such as the expansion of the battery cells and the abnormal increase of the internal pressure can be more timely and accurately identified, and corresponding power supply control measures are taken according to different battery states, so that the risk of safety accidents such as battery thermal runaway is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery power supply technology, specifically to a battery power supply control method, device, equipment, and medium. Background Technology

[0002] With the widespread application of battery products in energy storage devices, power tools, electric vehicles, and portable electronic devices, the safety of battery systems has received increasing attention. During the use of battery systems, factors such as overcharging, over-discharging, high temperature, internal short circuits, aging, or external impacts can cause abnormal expansion of battery cells. If cell expansion is not detected and addressed in time, it may further lead to safety accidents such as battery deformation, insulation failure, leakage, thermal runaway, or even fire.

[0003] In related technologies, battery systems typically use protection boards to detect parameters such as voltage, current, and temperature, and disconnect the charging and discharging circuits when these parameters become abnormal, in order to reduce the safety risks caused by battery failure. However, parameters such as voltage, current, and temperature often only show significant changes after the cell abnormality has developed to a certain extent, making it difficult to reflect the early expansion state of the cell in a timely manner. For situations where the mechanical pressure between cells gradually increases, existing protection methods are prone to problems of untimely detection and inaccurate judgment. Summary of the Invention

[0004] The main objective of this invention is to provide a battery power supply control method, device, equipment, and medium, aiming to at least solve the technical problems mentioned in the related art.

[0005] A first aspect of the present invention provides a battery power supply control method, the battery power supply control method comprising: The system acquires real-time pressure values ​​collected by multiple pressure sensors; wherein the multiple pressure sensors are respectively disposed between adjacent cells in the battery module and / or on the outer sides of cells at both ends along the cell arrangement direction in the battery module. The dynamic pressure threshold is determined based on the battery state parameters of the battery module. The pressure safety status of the battery module is determined based on the real-time pressure value and the dynamic pressure threshold. The power supply status of the battery module is controlled according to the pressure safety status.

[0006] A second aspect of the present invention provides a battery-powered control device, comprising: The pressure acquisition module is used to acquire real-time pressure values ​​collected by multiple sets of pressure sensors; wherein, the multiple sets of pressure sensors are respectively arranged between adjacent cells in the battery module and / or on the outside of cells at both ends along the cell arrangement direction in the battery module; The determination module is used to determine the dynamic pressure threshold based on the battery state parameters of the battery module; The status judgment module is used to determine the pressure safety status of the battery module based on the first inter-cell pressure value and the dynamic pressure threshold. The power supply control module is used to control the power supply status of the battery module according to the pressure safety status.

[0007] A third aspect of the present invention provides an electronic device, the electronic device including a memory, a processor, and a bus; the bus is used to realize connection and communication between the memory and the processor; the processor is used to execute a computer program stored in the memory; when the processor executes the computer program, it implements the steps of the battery power supply control method of the first aspect.

[0008] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the battery power supply control method of the first aspect.

[0009] The battery power supply control method, apparatus, device, and medium of the present invention acquire real-time pressure values ​​reflecting pressure changes within and at the boundaries of the battery module by installing pressure sensors between adjacent cells and / or on the outer sides of cells at both ends of the cell arrangement direction within the battery module. These pressure sensors are then combined with the current battery state parameters of the battery module to determine a dynamic pressure threshold. Based on the real-time pressure values ​​and the dynamic pressure threshold, the pressure safety state of the battery module is judged, and the power supply state of the battery module is controlled according to the pressure safety state. Through this method, the present application can directly sense mechanical pressure changes caused by cell expansion. Compared to existing technologies that primarily rely on electrical parameters such as voltage, current, and temperature for safety monitoring, this method can more timely and accurately identify potential safety risks such as cell expansion and abnormal increases in internal pressure. Corresponding power supply control measures can be taken according to different battery states, thereby reducing the risk of safety accidents such as battery thermal runaway and improving the safety, reliability, and adaptability of the battery system. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the battery power supply control structure at one angle according to an embodiment of this application. Figure 2 This is a schematic diagram of the battery power supply control structure from another angle, representing an embodiment of this application. Figure 3 This is a schematic diagram of the battery power supply control structure from another angle, representing an embodiment of this application. Figure 4 This is a schematic diagram of the basic process of the battery power supply control method provided in the embodiments of this application; Figure 5 This is a schematic diagram illustrating the principle of battery power supply control in an embodiment of this application. Figure 6 This is a schematic diagram of the module connection of the battery power supply control device provided in the embodiments of this application; Figure 7 This is a schematic diagram of the internal structure and connections of the electronic device provided in the embodiments of this application.

[0012] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0013] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0015] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "multiple" means two or more, unless otherwise explicitly specified. The term "comprising" indicates the presence of the described feature, whole, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. The term "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may include three cases: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0016] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art; the terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0017] Furthermore, terms such as "exemplary," "for example," and "optional" are used to indicate illustrative purposes. Any technical solution described by the above terms in the embodiments of this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, these terms are intended to present the relevant technical concepts in terms of specific implementation methods.

[0018] To address the technical issue in related technologies where abnormal cell expansion during battery module use is not detected in a timely manner, potentially leading to battery failure or safety incidents, please refer to [link to relevant documentation]. Figures 1 to 5 This application provides a battery power supply control method. This method can be applied to a battery power supply control system 1, a battery management system, or an energy storage battery system. The battery power supply system 1 includes a battery module, a pressure sensor 30, and an internal control circuit board 20. The internal control circuit board 20 is fixed to at least one of the left and right sides of the battery module via a mounting plate 70.

[0019] The battery power supply control method includes at least the following steps: Step S101: Obtain real-time pressure values ​​collected by multiple pressure sensors.

[0020] Specifically, a battery module generally includes multiple cells 10 arranged in sequence, and multiple sets of pressure sensors 30 are respectively disposed between adjacent cells 10 in the battery module and / or on the outer sides of cells at both ends of the battery module along the cell arrangement direction (i.e., the outer side of the leftmost cell and / or the outer side of the rightmost cell). It can be understood that the pressure values ​​detected by the multiple sets of pressure sensors located between adjacent cells 10 can more directly reflect the degree of cell expansion and the mechanical constraint state between cells, while the pressure values ​​detected on the outer side of the leftmost cell and / or the outer side of the rightmost cell are more biased towards auxiliary monitoring. That is, the pressure on the outer side of the cell mainly reflects the expansion trend of the entire battery module, the external pressure on the module casing, and the overall structural deformation.

[0021] It should be noted that, compared to detecting battery status solely through electrical parameters such as temperature, voltage, or current, this application, by detecting changes in mechanical pressure between cells and at the boundaries of the battery module, can more directly reflect the cell expansion process. When a cell undergoes volume changes due to internal side reactions, gas production, or other abnormal conditions, it will cause changes in the pressure between cells or the pressure outside the module. Therefore, by monitoring the pressure change trend through the pressure sensor 30, potential abnormal states of the battery module can be detected in advance, enabling the internal control circuit board 20 to take timely protective measures such as current limiting, power supply interruption, or alarm based on the pressure status, thereby improving the safety and reliability of the battery module operation.

[0022] In an optional embodiment, the internal control circuit board 20 can also adaptively adjust the pressure detection strategy according to different power supply states of the battery module. Specifically, in overcharge mode, due to the intensified side reactions inside the cell 10, gas is generated, leading to an increased risk of expansion. The internal control circuit board 20 can increase the pressure sampling frequency and use a lower pressure warning threshold to promptly identify abnormal expansion trends. In normal charging mode, based on the pressure change characteristics during normal charging of the battery module, a corresponding pressure judgment threshold is used to monitor the real-time pressure value to avoid false alarms caused by normal expansion. In power outage mode, the pressure changes between cells are continuously monitored, and the battery module is judged to meet the recovery conditions based on whether the pressure value has recovered to a safe range. By setting different pressure detection strategies for overcharge mode, normal charging mode, and power outage mode, the pressure detection can be adapted to the expansion characteristics of the battery module under different operating states, improving the accuracy of abnormal expansion identification and the reliability of battery power supply control.

[0023] For example, in normal charging mode, the internal control circuit board 20 acquires the real-time pressure value collected by the pressure sensor 30 at a first sampling frequency, and determines whether the battery cell 10 has an abnormal expansion trend based on the pressure threshold corresponding to the normal charging mode. In overcharge mode, the internal control circuit board 20 acquires the real-time pressure value at a second sampling frequency higher than the first sampling frequency, and lowers the corresponding pressure judgment threshold to improve the detection sensitivity of abnormal cell expansion. In power-off mode, the internal control circuit board 20 continues to acquire the real-time pressure value collected by the pressure sensor 30 at a third sampling frequency lower than the first sampling frequency, and determines whether the battery module meets the conditions for power restoration based on whether the real-time pressure value has fallen back to a safe range. By performing pressure monitoring and threshold judgment for overcharge mode, normal charging mode, and power-off mode respectively, the battery module can have a matching pressure anomaly identification strategy at different operating stages, improving the accuracy of abnormal expansion detection and the safety of power supply control.

[0024] Step S102: Determine the dynamic pressure threshold based on the battery state parameters of the battery module.

[0025] Specifically, the internal control circuit board 20 can acquire the battery status parameters of the battery module and determine the corresponding dynamic pressure threshold under the current operating conditions based on the battery status parameters. The battery status parameters may include at least one of the battery module's operating mode, temperature, state of charge, and state of health.

[0026] For example, the pressure change characteristics between cells 10 are different in charging mode, discharging mode or resting mode, so different dynamic pressure thresholds can be set accordingly; when the battery module is in a high temperature state or in poor health state, the dynamic pressure threshold can be appropriately reduced to improve the sensitivity of safety warning.

[0027] It should be understood that the dynamic pressure threshold refers to a pressure judgment threshold that is adjusted in real time or periodically based on the current operating status of the battery module, and is not a fixed, single pressure value. The dynamic pressure threshold can be used to determine whether the pressure between adjacent cells in the battery module is abnormal.

[0028] Step S103: Determine the pressure safety status of the battery module based on the real-time pressure value and the dynamic pressure threshold.

[0029] Specifically, the internal control circuit board 20 can compare the real-time pressure value with the dynamic pressure threshold to determine whether there is a risk of abnormal expansion of the battery module. For example, when the real-time pressure value exceeds the dynamic pressure threshold, and / or the real-time pressure value continues to exceed the dynamic pressure threshold for a preset time, it can be determined that the battery module is in an abnormal pressure state.

[0030] In some implementations, the pressure change rate can be calculated based on the real-time pressure value. When the pressure change rate exceeds a preset threshold, it indicates that the pressure between the cells 10 has increased rapidly in a short period of time, and it can be determined that the battery module has a risk of abnormal expansion. The pressure safety state can include at least one of the following: normal state, warning state, protection state, and isolation state.

[0031] Step S104: Control the power supply status of the battery module according to the pressure safety status.

[0032] Specifically, when the pressure safety status is normal, the internal control circuit board 20 controls the battery module to maintain normal power supply; when the pressure safety status is warning status, the internal control circuit board 20 can control the battery module to limit the charging and discharging current or reduce the charging power; when the pressure safety status is protection status, the internal control circuit board 20 can control the battery module to disconnect the main circuit to stop charging and discharging; when the pressure safety status is isolation status, the internal control circuit board 20 can control the battery module to disconnect all power supply circuits and output fault prompts through alarm lights, buzzers, or displays.

[0033] As can be seen, the embodiments of this application can promptly identify the risk of abnormal cell expansion based on the pressure changes between adjacent cells 10, and control the power supply status of the battery module according to the pressure safety status, thereby reducing the risk of battery failure or safety accidents.

[0034] In some optional embodiments, the real-time pressure value includes multiple sets of inter-cell pressure values ​​and / or external pressure values ​​of the cells collected at different time periods. Each set of inter-cell pressure values ​​includes the pressure values ​​collected by the pressure sensor between every two adjacent cells 10 in the battery module. That is, multiple pressure sensors 30 can continuously collect the pressure values ​​between adjacent cells 10 according to a preset collection cycle to form multiple sets of pressure data that change over time.

[0035] Specifically, after the step of acquiring the real-time pressure values ​​collected by multiple pressure sensors 30, the method further includes: When the pressure value on the outside of the battery cell and / or the pressure value on the outside of the battery cell is greater than the preset pressure abnormality threshold, the dynamic pressure threshold is determined according to the battery state parameters of the battery module.

[0036] Specifically, based on the pressure values ​​between cells and / or the pressure values ​​on the outside of cells, as well as the preset pressure abnormality threshold, it is determined whether there is a pressure abnormality trend in the battery module. When there is a pressure abnormality trend, it indicates that the pressure state of the battery module may deviate from the normal operating range, and there may be risks such as abnormal expansion of cells, increased internal gas production, or overall expansion of the module. It is necessary to further combine the current battery state to accurately judge the pressure safety state, that is, to determine the dynamic pressure threshold based on the battery state parameters of the battery module.

[0037] The preset pressure anomaly threshold is determined by analyzing the pressure data collected during each of the battery module's pre-set number of normal charge-discharge cycles. For example, when the battery module is first put into use, it can be controlled to perform a preset number of normal charge-discharge cycles (e.g., 3), and pressure data between adjacent cells and / or on the outside of the cells can be collected during each cycle. Based on the pressure data collected during multiple cycles, the pressure variation range of the battery module under normal operating conditions can be analyzed. For example, the average pressure, maximum pressure, pressure fluctuation range, or pressure change trend at each collection point can be statistically analyzed, and the preset pressure anomaly threshold can be determined based on the analysis results. By determining the pressure anomaly judgment benchmark based on the pressure data during the normal operation of the battery module itself, the preset pressure anomaly threshold can be adapted to the structural characteristics and assembly state of different battery modules, avoiding misjudgments or omissions caused by using a fixed pressure threshold, and improving the accuracy of pressure anomaly trend identification.

[0038] Furthermore, abnormal pressure values ​​can be determined based on the pressure values ​​between each group of cells, and preprocessing can be performed to obtain effective pressure data.

[0039] For example, the internal control circuit board 20 can calculate the average pressure value of each set of pressure values ​​(inter-cell pressure value and / or external cell pressure value). Based on the pressure mean and pressure dispersion parameters (including at least one of pressure standard deviation σ, pressure variance, or pressure range), anomaly judgment intervals are determined. Pressure values ​​that do not belong to the anomaly judgment intervals are identified as abnormal pressure values. Abnormal pressure values ​​are removed from the inter-cell pressure values ​​and / or the external pressure values ​​of the cells to obtain the effective pressure data from the inter-cell pressure values ​​and / or the external pressure values ​​of the cells.

[0040] Among them, the average pressure = , These represent the pressure values ​​(inter-cell pressure and / or external cell pressure) collected by multiple pressure sensors 30 within the same data acquisition period, where n represents the number of pressure values; the pressure standard deviation σ = .

[0041] For example, when a certain pressure value is equal to the average pressure value If the deviation exceeds 3σ, the pressure value can be identified as an abnormal pressure value and removed from the collected data to obtain valid pressure data. This reduces the impact of individual pressure sensor malfunctions, installation deviations, or transient interference on the judgment results.

[0042] Furthermore, determining the pressure safety status of the battery module based on real-time pressure values ​​and dynamic pressure thresholds can include: determining the pressure safety status of the battery module based on effective pressure data and dynamic pressure thresholds. Specifically, the internal control circuit board 20 can compare the pre-processed effective pressure data with the current dynamic pressure threshold, and combine this with the changing trend of the effective pressure data to determine whether the battery module is in a normal state, a warning state, a protection state, or an isolation state, thereby avoiding misjudgments or omissions due to abnormal sampling values ​​and improving the reliability of battery power supply control.

[0043] In some optional implementations, the battery status parameters include at least one of operating mode, temperature, state of charge (SOC), and state of health. Determining the dynamic pressure threshold based on the battery status parameters of the battery module includes: acquiring at least one of the battery module's operating mode, temperature, SOC, and state of health; and adjusting a preset base pressure threshold based on at least one of the operating mode, temperature, SOC, and state of health to obtain the dynamic pressure threshold.

[0044] The operating mode includes at least one of charging mode, discharging mode, and idle mode, and the dynamic pressure threshold includes at least one of warning pressure threshold, protection pressure threshold, and isolation pressure threshold. This dynamic pressure threshold is used to characterize the critical pressure value used to determine whether the pressure between adjacent cells is abnormal under the current operating state of the battery module.

[0045] Specifically, the pressure change characteristics between the cells 10 differ under different operating conditions. For example, in charging mode, the expansion trend of the cells 10 may be more obvious, and a relatively low warning pressure threshold can be set; in discharging mode, the corresponding pressure threshold can be adjusted according to the magnitude of the discharge current; in static mode, if the pressure between the cells continues to rise, it may indicate that there is a risk of abnormal expansion of the cells 10.

[0046] Furthermore, temperature, state of charge, and health status also affect the safety risks of the battery module. For example, when the battery module has a high temperature, a high state of charge, or a poor health status, the internal control circuit board 20 can lower the preset base pressure threshold to improve the sensitivity of pressure anomaly detection; when the battery module is in a low-risk state, the pressure threshold can be appropriately increased to reduce false alarms.

[0047] It should be noted that temperature can include the internal temperature of the battery module and / or the external ambient temperature. The internal temperature of the battery module can be used to characterize the thermal state of the cell 10 or the battery module itself, while the external ambient temperature can be used to characterize the temperature state of the environment in which the battery module is used. When the temperature is high, the risk of abnormal expansion or thermal runaway of the cell 10 increases. Therefore, the dynamic pressure threshold can be appropriately reduced to improve the sensitivity of pressure anomaly detection. The state of charge (SOC) can be used to characterize the current remaining charge or charging level of the battery module. For example, the higher the SOC, the more energy is stored inside the battery, and the higher the risk of abnormal expansion or internal reactions. Therefore, the dynamic pressure threshold can be adjusted according to the SOC value. The state of health (SOH) can be used to characterize the degree of aging, capacity decay, or performance degradation of the battery module or cell 10. For example, when the SOH is low, it indicates that the battery module is aging more and the stability of the cell 10 may decrease. In this case, the dynamic pressure threshold can be appropriately reduced to identify the risk of abnormal cell expansion in advance.

[0048] As can be seen, the dynamic pressure threshold in this embodiment is not fixed, but is adjusted according to the actual operating state of the battery module, so that the judgment of the pressure safety state is more accurate and the risk of misjudgment or omission caused by fixed threshold judgment is reduced.

[0049] In one optional embodiment, determining the pressure safety status of the battery module based on real-time pressure values ​​and dynamic pressure thresholds includes: calculating pressure characteristic parameters based on effective pressure data, and determining the pressure safety status of the battery module based on the pressure characteristic parameters and dynamic pressure thresholds.

[0050] Among them, the pressure characteristic parameters include the pressure change rate. Alternatively, pressure characteristic parameters may include the rate of pressure change. Duration of pressure exceeding limit (T), mean pressure Pressure variance At least one of pressure kurtosis and pressure kurtosis.

[0051] In an optional embodiment, the effective pressure data is the pressure data after discarding abnormal pressure values ​​from the inter-cell pressure values. Accordingly, the pressure change rate is used to characterize the rate at which the pressure between adjacent cells 10 changes over time, and the pressure change rate can be expressed as: = ;in, This indicates the pressure value at the current data collection moment. This represents the pressure value at the previous data collection time. This represents the time interval between two consecutive data collections. The pressure duration exceeding the limit (T) characterizes the time during which the effective pressure data remains above the dynamic pressure threshold. When the effective pressure data remains above the dynamic pressure threshold for a duration greater than the preset duration threshold, it indicates that the pressure anomaly is not a transient disturbance but a persistent anomaly, suggesting a high pressure safety risk to the battery module. Pressure variance characterizes the degree of fluctuation between pressure values ​​across multiple cells; pressure variance can be expressed as: When the pressure variance increases, it indicates a greater pressure difference between cells at different locations within the battery module, potentially indicating a risk of abnormal expansion in localized cells. Pressure kurtosis is used to characterize the degree of abrupt changes in pressure distribution. Abnormal pressure kurtosis indicates significant abrupt changes in some pressure values ​​relative to the overall pressure level, which can serve as an auxiliary basis for identifying localized abnormal expansion.

[0052] In an optional implementation, if the pressure characteristic parameter is the pressure change rate... When the dynamic pressure threshold is set to the preset rate of change threshold, the two are compared, and when the pressure change rate... When the rate of change exceeds the preset threshold, it indicates that the pressure between the cells 10 has increased rapidly in a short period of time, which may pose a risk of abnormal cell expansion or intensified internal reaction.

[0053] In one optional embodiment, this embodiment not only makes a judgment based on a single pressure value, but also combines pressure characteristic parameters such as pressure change rate, duration of exceeding limit, pressure mean, pressure variance and pressure kurtosis to comprehensively judge the pressure safety status of the battery module, thereby improving the accuracy of identifying the risk of abnormal cell expansion and reducing the risk of misjudgment or omission.

[0054] In one optional embodiment, determining abnormal pressure values ​​based on the inter-cell pressure values ​​and / or cell outer pressure values, and preprocessing them to obtain effective pressure data includes: First, comparing the cell outer pressure value with a preset outer pressure threshold to determine whether the cell outer pressure value is greater than the outer pressure threshold; when the cell outer pressure value is greater than the outer pressure threshold, it is determined that the corresponding cell group has a risk of abnormal pressure, and further comparing the inter-cell pressure value between adjacent cells within the cell group with a preset inner pressure threshold; when the inter-cell pressure value is greater than the inner pressure threshold, it is determined that the cell group has abnormal expansion or abnormal pressure, and the corresponding cell outer pressure value and inter-cell pressure value are determined as abnormal pressure values. Subsequently, the abnormal pressure values ​​are subjected to noise reduction, outlier removal, smoothing filtering, and / or normalization processing to obtain effective pressure data for cell status judgment.

[0055] The outer pressure threshold differs from the inner pressure threshold, and the difference between them is related to the degree of pressure attenuation during the pressure transmission process from inside the battery cell assembly to the outside. Specifically, this difference can be pre-calibrated based on at least one of the following: structural parameters of the battery cell assembly, connection method between cells, stiffness of the battery cell assembly housing or constraint structure, installation position of the pressure sensor, and pressure attenuation coefficient in the pressure transmission path. This compensates for the detection differences between inter-cell pressure and outer-cell pressure caused by different detection positions and pressure transmission paths, reducing misjudgments caused by relying solely on pressure detection results from a single location.

[0056] In one optional embodiment, the outer pressure threshold is less than the inner pressure threshold. Because the pressure generated by cell expansion is buffered or attenuated by the cell casing, adjacent cells, fixing components, and battery pack constraints as it is transmitted from the inside of the cell assembly to the outside, the outer pressure value is typically less than the inter-cell pressure value. The difference between the outer pressure threshold and the inner pressure threshold can be set according to a predetermined pressure attenuation amount, or calculated based on the inner pressure threshold and a preset pressure transmission coefficient. For example, the outer pressure threshold can be determined by multiplying the inner pressure threshold by the pressure transmission coefficient.

[0057] Furthermore, when the pressure value outside the cell is greater than the external pressure threshold, but the pressure value between the cells is not greater than the internal pressure threshold, the corresponding pressure data can be marked as pressure data to be confirmed, and a secondary judgment can be made in conjunction with the pressure duration, pressure change rate, pressure values ​​of adjacent cell groups, and / or cell temperature. When both the external pressure value and the inter-cell pressure value exceed their respective pressure thresholds, the corresponding pressure data is determined as valid abnormal pressure data; when neither the external pressure value nor the inter-cell pressure value exceeds their respective pressure thresholds, the corresponding pressure data is determined as normal pressure data.

[0058] In one optional embodiment, determining the pressure safety status of the battery module based on pressure characteristic parameters and a dynamic pressure threshold includes: when the pressure change rate... When the effective pressure data exceeds the preset rate of change threshold and / or the time T for which the effective pressure data is continuously higher than the dynamic pressure threshold exceeds the preset duration threshold, the battery module is determined to be in an abnormal pressure state.

[0059] When the pressure change rate exceeds a preset change rate threshold, it indicates that the pressure between the battery cells 10 has increased rapidly in a short period of time, which may pose a risk of abnormal cell expansion or intensified internal reactions. When the effective pressure data remains above the dynamic pressure threshold for a period of time longer than a preset duration threshold, it indicates that the pressure anomaly is not a momentary fluctuation or sampling interference, but a persistent anomaly. Therefore, the internal control circuit board 20 can determine that the battery module is in an abnormal pressure state and further perform control actions such as current limiting, power supply interruption, or power isolation based on the degree of anomaly.

[0060] Please see Figure 5 In some optional embodiments, the internal control circuit board 20 is electrically connected to the pressure sensor 30, the power input circuit 40, the alarm display module 50, and the power output circuit 60, respectively. The power input circuit 40 includes an input switch 41, and the power output circuit 60 includes an output switch 61. The internal control circuit board 20 is used to determine the pressure safety status of the battery module based on the pressure value collected by the pressure sensor 30, and to control the operating status of the input switch 41, the output switch 61, and the alarm display module 50 according to the pressure safety status.

[0061] Specifically, the pressure safety state includes at least one of the following: normal state, warning state, protection state, and isolation state. The power supply state of the battery module is controlled according to the pressure safety state, including: When the pressure safety state is normal, the internal control circuit board 20 controls the input switch 41 and the output switch 61 to remain on, so that the battery module is in a normal charging and / or discharging state. When the pressure safety status is in the warning state, the internal control circuit board 20 controls the battery module to enter the current-limited power supply state, such as limiting the charging and discharging current, reducing the charging power, and controlling the alarm display module 50 to output the warning prompt. When the pressure safety state is in the protection state, the internal control circuit board 20 controls the disconnection of the input switch 41 and / or the output switch 61 to disconnect the main circuit of the battery module, so that the battery module stops charging and / or discharging. When the pressure safety state is in the isolation state, the internal control circuit board 20 controls both the input switch 41 and the output switch 61 to disconnect all power supply circuits to the battery module and controls the alarm display module 50 to output an alarm signal. The alarm signal may include at least one of the following: a flashing alarm light signal, a buzzer alarm signal, and a fault message displayed on the screen.

[0062] Therefore, the internal control circuit board 20 can perform graded power supply control of the battery module according to the degree of pressure abnormality, provide current limiting warning in the early stage of pressure abnormality, disconnect the main circuit when the risk increases, and disconnect all power supply circuits and alarm when there is a serious abnormality, thereby improving the safety of battery module use.

[0063] Please see Figure 6 This application also provides a battery-powered control device, including: The pressure acquisition module 601 is used to acquire real-time pressure values ​​collected by multiple pressure sensors; wherein, the multiple pressure sensors are respectively set between adjacent cells in the battery module and / or on the outside of cells at both ends along the cell arrangement direction in the battery module; The determination module 602 is used to determine the dynamic pressure threshold based on the battery state parameters of the battery module. The status judgment module 603 is used to determine the pressure safety status of the battery module based on the real-time pressure value and the dynamic pressure threshold. The power supply control module 604 is used to control the power supply status of the battery module according to the pressure safety status.

[0064] The battery power supply control device of this application acquires real-time pressure values ​​from multiple pressure sensors installed between adjacent battery cells, determines a dynamic pressure threshold by combining the battery state parameters of the battery module, and then judges the pressure safety status of the battery module based on the real-time pressure values ​​and the dynamic pressure threshold. Based on the pressure safety status, the power supply status of the battery module is controlled, enabling the battery system to promptly identify risks when abnormal cell expansion or abnormal increase in inter-cell pressure occurs, and to take control measures such as current limiting, power supply interruption, or power outage protection. Compared to related technologies that mainly rely on parameters such as voltage, current, and temperature for protection, this application can more directly reflect the risk of cell expansion failure, reduce safety accidents caused by the failure to detect early cell expansion in time, and improve the safety and reliability of the battery system.

[0065] Figure 7 An electronic device provided by an embodiment of the present invention is shown. This electronic device can be used to implement the battery power supply control method in any of the foregoing embodiments. The electronic device includes: The system includes a memory 701, a processor 702, a bus 703, and a computer program stored on the memory 701 and executable on the processor 702. The memory 701 and the processor 702 are connected via the bus 703. When the processor 702 executes the computer program, it implements the battery power supply control method described in the foregoing embodiments. The number of processors can be one or more.

[0066] The memory 701 can be a high-speed random access memory (RAM) or a non-volatile memory, such as a disk storage device. The memory 701 is used to store executable program code, and the processor 702 is coupled to the memory 701.

[0067] Furthermore, embodiments of this application also provide a computer-readable storage medium, which may be disposed in the electronic device in the above embodiments, and the computer-readable storage medium may be a memory.

[0068] The computer-readable storage medium stores a computer program that, when executed by a processor, implements the battery-powered control method described in the foregoing embodiments. Furthermore, the computer-readable storage medium can also be a USB flash drive, a portable hard drive, a read-only memory (ROM), RAM, a magnetic disk, or an optical disk, or any other medium capable of storing program code.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0070] The modules described as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0071] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0072] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, external hard drives, ROM, RAM, magnetic disks, or optical disks.

[0073] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A battery-powered control method, characterized in that, The battery power supply control method includes: The system acquires real-time pressure values ​​collected by multiple pressure sensors; wherein the multiple pressure sensors are respectively disposed between adjacent cells in the battery module and / or on the outer sides of cells at both ends along the cell arrangement direction in the battery module. The dynamic pressure threshold is determined based on the battery state parameters of the battery module. The pressure safety status of the battery module is determined based on the real-time pressure value and the dynamic pressure threshold. The power supply status of the battery module is controlled according to the pressure safety status.

2. The battery power supply control method as described in claim 1, characterized in that, The real-time pressure value includes multiple sets of inter-cell pressure values ​​and / or external pressure values ​​of the cells collected at different time periods. Each set of inter-cell pressure values ​​includes the pressure value collected by the pressure sensor between every two adjacent cells in the battery module. After acquiring the real-time pressure values ​​collected by multiple pressure sensors, the method further includes: When the pressure value on the outside of the battery cell and / or the pressure value on the outside of the battery cell is greater than a preset pressure abnormality threshold, a dynamic pressure threshold is determined based on the battery state parameters of the battery module; wherein, the preset pressure abnormality threshold is determined by analyzing the pressure data collected during each charge and discharge cycle after the battery module has completed a preset number of normal charge and discharge cycles. Abnormal pressure values ​​are determined based on the inter-cell pressure values ​​and / or external cell pressure values ​​described in each group, and preprocessing is performed to obtain effective pressure data; The step of determining the pressure safety status of the battery module based on the real-time pressure value and the dynamic pressure threshold includes: The pressure safety status of the battery module is determined based on the effective pressure data and the dynamic pressure threshold.

3. The battery power supply control method as described in claim 2, characterized in that, The process of determining abnormal pressure values ​​based on the inter-cell pressure values ​​and / or external cell pressure values ​​of each group, and preprocessing them to obtain effective pressure data, includes: For each set of pressure values, calculate the mean pressure and the pressure dispersion parameter; The anomaly detection interval is determined based on the average pressure and the pressure discrete parameters. Pressure values ​​that do not belong to the aforementioned abnormal judgment range are identified as abnormal pressure values; The abnormal pressure values ​​are removed from the inter-cell pressure values ​​and / or the external pressure values ​​of the cell to obtain the effective pressure data; The pressure discrete parameters include at least one of pressure standard deviation, pressure variance, and pressure range.

4. The battery power supply control method as described in claim 3, characterized in that, The battery status parameters include at least one of the following: operating mode, temperature, state of charge, and state of health. Determining the dynamic pressure threshold based on the battery state parameters of the battery module includes: Acquire at least one of the following: operating mode, temperature, state of charge, and state of health of the battery module; The preset base pressure threshold is adjusted based on at least one of the operating mode, the temperature, the state of charge, and the health state to obtain the dynamic pressure threshold. The operating mode includes at least one of charging mode, discharging mode and static mode, and the dynamic pressure threshold includes at least one of warning pressure threshold, protection pressure threshold and isolation pressure threshold.

5. The battery power supply control method as described in claim 4, characterized in that, The step of determining the pressure safety status of the battery module based on the real-time pressure value and the dynamic pressure threshold includes: Calculate pressure characteristic parameters based on the effective pressure data; The pressure safety status of the battery module is determined based on the pressure characteristic parameters and the dynamic pressure threshold. The pressure characteristic parameters include at least one of the following: pressure change rate, pressure duration exceeding limit, pressure mean, pressure variance, and pressure kurtosis.

6. The battery power supply control method as described in claim 5, characterized in that, The step of determining the pressure safety status of the battery module based on the pressure characteristic parameters and the dynamic pressure threshold includes: When the pressure change rate is greater than a preset change rate threshold, and / or the effective pressure data is continuously higher than the dynamic pressure threshold for a period of time that is greater than a preset duration threshold, the battery module is determined to be in an abnormal pressure state. The pressure change rate is determined based on the difference between the pressure value at the current sampling time and the pressure value at the previous sampling time, as well as the time interval between adjacent sampling times.

7. The battery power supply control method according to any one of claims 1 to 6, characterized in that, The pressure safety status includes at least one of the following: normal status, early warning status, protection status, and isolation status; The step of controlling the power supply state of the battery module according to the pressure safety state includes: When the pressure safety state is in the warning state, the battery module is controlled to enter the current-limited power supply state; When the pressure safety state is in the protection state, disconnect the main circuit of the battery module to stop the battery module from charging and discharging; When the pressure safety state is in the isolation state, all power supply circuits of the battery module are disconnected and an alarm signal is output.

8. A battery-powered control device, characterized in that, include: The system acquires real-time pressure values ​​collected by multiple pressure sensors; wherein the multiple pressure sensors are respectively disposed between adjacent cells in the battery module and / or on the outer sides of cells at both ends along the cell arrangement direction in the battery module. The dynamic pressure threshold is determined based on the battery state parameters of the battery module. The pressure safety status of the battery module is determined based on the first inter-cell pressure value and the dynamic pressure threshold. The power supply status of the battery module is controlled according to the pressure safety status.

9. An electronic device, characterized in that, Includes memory, processor, and bus; The bus is used to enable communication between the memory and the processor; The processor is used to execute computer programs stored in the memory; When the processor executes the computer program, it implements the steps in the battery power supply control method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the battery power supply control method according to any one of claims 1 to 7.

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