Shut-down control method and energy storage device

Abstract

The application provides a shutdown control method and an energy storage device, and relates to the technical field of energy storage devices. The shutdown control method comprises the following steps: obtaining a first original sampling value, a second original sampling value and a third original sampling value, and converting the first original sampling value, the second original sampling value and the third original sampling value to obtain a first acceleration component, a second acceleration component and a third acceleration component; calculating a current combined acceleration and a current combined impact value; determining whether the energy storage device is in a falling state based on the current combined acceleration, the first acceleration component, the second acceleration component and the third acceleration component, and determining whether the energy storage device is in a collision state based on the current combined impact value; and controlling the energy storage device to shut down when the energy storage device is in the falling state and / or the collision state. In the technical scheme of the application, the energy storage device can be timely shut down in a falling process or at an initial stage of a collision before an internal circuit short circuit is caused, so that product heating and fire problems are avoided from the root, and the use safety is improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment technology, and more specifically, to a shutdown control method and an energy storage device. Background Technology

[0002] With the development of mobile energy storage technology, portable energy storage products are widely used in scenarios without grid coverage, such as outdoor camping, medical rescue, home emergency power backup, and outdoor operations. In actual use, portable energy storage products are susceptible to damage from external forces such as accidental collisions and drops from heights, which can cause damage to their internal structure and electrical components.

[0003] In related technologies, portable energy storage products use a shell for cushioning and internal mechanical structural components such as battery cell fixing brackets for collision and drop protection.

[0004] This type of mechanical protection method has obvious drawbacks: the protective effect of mechanical buffering is limited. If the impact force is large or the drop height is high, it is still difficult to avoid problems such as internal PCB (Printed Circuit Board) breakage, electronic component solder joint detachment, and conductive structure being squeezed and deformed, which may lead to internal circuit short circuit and pose safety hazards. Summary of the Invention

[0005] One objective of this invention is to provide a shutdown control method that can promptly shut down the energy storage device during a drop or in the early stages of a collision, before an internal short circuit is triggered. This fundamentally avoids the problem of product overheating and fire caused by continuous external discharge of the battery module during collisions and drops, thereby improving the safety of energy storage devices.

[0006] Another object of the present invention is to provide an energy storage device.

[0007] To achieve the above objectives, a first aspect of the present invention provides a shutdown control method applied to an energy storage device. The energy storage device includes a battery management system, which includes an accelerometer. The shutdown control method includes: acquiring a first raw sampled value in the X-axis direction, a second raw sampled value in the Y-axis direction, and a third raw sampled value in the Z-axis direction from the energy storage device using the accelerometer; and calculating a first acceleration component based on the first raw sampled value, a second acceleration component based on the second raw sampled value, and a third acceleration component based on the third raw sampled value, wherein X... The Y-axis and Z-axis are perpendicular to each other; the current composite acceleration is calculated based on the first, second, and third acceleration components, and the current composite impact value is calculated based on the first, second, and third original sampled values; based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component, it is determined whether the energy storage device is in a drop state, and based on the current composite impact value, it is determined whether the energy storage device is in a collision state; if the energy storage device is in a drop state and / or a collision state, the energy storage device is shut down.

[0008] This invention aims to provide a shutdown control method. By adding an accelerometer to the battery management system and converting and analyzing the data collected by the accelerometer, the method can accurately identify the drop and collision states of the energy storage device. Furthermore, when the energy storage device is in a drop or / or collision state, the method controls the device to shut down. Compared to purely mechanical protection methods, this design can promptly shut down the energy storage device during a drop or in the early stages of a collision, before an internal short circuit occurs. This cuts off the external power supply path of the battery module, fundamentally preventing overheating and fire problems caused by continuous external discharge of the battery module during collisions or drops, thus improving the safety of energy storage devices.

[0009] In some technical solutions, optionally, the current composite acceleration is calculated based on the first acceleration component, the second acceleration component, and the third acceleration component, including: calculating the current composite acceleration based on the first acceleration component, the second acceleration component, and the third acceleration component according to a first calculation formula; wherein, the first calculation formula is:

[0010] ;

[0011] a 合 Given the current synthesis acceleration, a x For the first acceleration component, a y For the second acceleration component, a z This is the third acceleration component.

[0012] In this technical solution, based on the principle of spatial vector synthesis, the sum of squares of the three-axis acceleration components is taken as the square root to obtain the current composite acceleration at the current moment. The calculation method is simple and helps to improve data processing efficiency.

[0013] In some technical solutions, optionally, the current synthetic impact value is calculated based on the first original sample value, the second original sample value, and the third original sample value, including: calculating the current synthetic impact value based on the first original sample value, the second original sample value, and the third original sample value using a second calculation formula; wherein the second calculation formula is:

[0014] ;

[0015] G peak For the current synthetic impact value, Raw x The first raw sample value, Raw y The second raw sample value, Raw z The third raw sample value is Raw0, which is a preset calibration parameter.

[0016] In this technical solution, the current synthetic impact value is calculated based on the three-axis original sample values ​​(first original sample value, second original sample value and third original sample value). The calculation method is simple and helps to improve data processing efficiency.

[0017] Optionally, in some technical solutions, determining whether an energy storage device is in a drop state based on the current composite acceleration, a first acceleration component, a second acceleration component, and a third acceleration component includes: determining that the energy storage device is in a drop state when the current composite acceleration is less than a preset weightlessness threshold, the first duration is greater than or equal to a first preset duration, and the first, second, and third acceleration components all show a decreasing trend, wherein the first duration is the duration during which the current composite acceleration is continuously less than the preset weightlessness threshold; determining that the energy storage device is not in a drop state when the current composite acceleration is greater than or equal to the preset weightlessness threshold, or the first duration is less than the first preset duration, or at least one of the first, second, and third acceleration components shows a non-decreasing trend.

[0018] This technical solution employs a triple-judgment mechanism of "amplitude verification, duration verification, and trend verification." If all three conditions are met simultaneously, the energy storage device is determined to be in a drop condition; if at least one condition is not met, the energy storage device is determined not to be in a drop condition. This design significantly improves the accuracy of drop condition identification, ensuring that real drop incidents are not missed and effectively avoiding false triggers during daily use.

[0019] In some technical solutions, optionally, the preset weightlessness threshold is 0.3g to 0.8g; and / or the first preset duration is 20ms to 50ms.

[0020] In this technical solution, by limiting the range of the preset weightlessness threshold, the sensitivity of drop detection and the ability to resist interference can be balanced. It can effectively filter out small acceleration fluctuations in non-drop scenarios such as daily handling, slight shaking of equipment, and vehicle bumps, and prevent accidental triggering of shutdown protection during normal use, which is conducive to improving the accuracy and reliability of drop recognition.

[0021] Furthermore, by limiting the range of values ​​for the first preset duration, both interference signal filtering capability and response speed can be taken into account. This can effectively filter out sensor thermal noise and extremely short-duration weightlessness jump signals caused by instantaneous electromagnetic interference, eliminate false judgments caused by noise, and improve the accuracy and reliability of drop detection.

[0022] In some technical solutions, optionally, determining whether the energy storage device is in a collision state based on the current synthetic impact value includes: determining that the energy storage device is in a collision state if the current synthetic impact value is greater than a preset impact threshold, the second duration is greater than or equal to a second preset duration, and the rate of change of the current synthetic impact value is greater than or equal to a rate of change threshold, wherein the second duration is the duration for which the current synthetic impact value is continuously greater than the preset impact threshold; and determining that the energy storage device is not in a collision state if the current synthetic impact value is less than or equal to the preset impact threshold, or the second duration is less than the second preset duration, or the rate of change of the current synthetic impact value is less than the rate of change threshold.

[0023] This technical solution employs a triple-judgment mechanism: "impact amplitude verification, duration verification, and rate of change verification." If all three conditions are met simultaneously, the energy storage device is determined to be in a collision state; if at least one condition is not met, the energy storage device is determined not to be in a collision state. This design significantly improves the accuracy of collision state identification and reduces the possibility of false positives.

[0024] In some technical solutions, optionally, an accelerometer is used to acquire a first raw sample value in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction from the energy storage device. A first acceleration component is calculated based on the first raw sample value, a second acceleration component is calculated based on the second raw sample value, and a third acceleration component is calculated based on the third raw sample value. This includes: acquiring the first raw sample value in the X-axis direction, the second raw sample value in the Y-axis direction, and the third raw sample value in the Z-axis direction from the energy storage device; filtering the first, second, and third raw sample values ​​to remove abnormal noise; calculating the first acceleration component based on the filtered first raw sample value, calculating the second acceleration component based on the filtered second raw sample value, and calculating the third acceleration component based on the filtered third raw sample value.

[0025] In this technical solution, a three-axis synchronous acquisition mechanism is adopted to ensure the time consistency of data of each axis, providing an accurate time reference for subsequent vector synthesis and trend determination; by pre-setting calibration parameters, the digital sampled values ​​(raw sampled values) without physical meaning are converted into standard acceleration physical quantities (acceleration components), completing the mapping from the sensor raw data to the engineering physical quantity; the pre-filtering process can effectively filter environmental interference, improve the signal-to-noise ratio of the raw data, and reduce the probability of misjudgment in subsequent working condition determination from the data source end.

[0026] In some technical solutions, optionally, a switching device is provided on the charging and discharging circuit of the energy storage device; when the energy storage device is in a drop state and / or collision state, controlling the energy storage device to shut down includes: controlling the switching device to be in an open state when the energy storage device is in a drop state and / or collision state.

[0027] In this technical solution, by controlling the energy storage device to shut down in time during the drop or the initial stage of the collision before an internal short circuit is triggered, and cutting off the external power supply path of the battery module, the problem of product overheating and fire caused by the continuous external discharge of the battery module during collision and drop accidents can be avoided at the source, which is conducive to improving the safety of energy storage device use.

[0028] A second aspect of the present invention provides an energy storage device, including a battery management system, the battery management system including a control module and an acceleration sensor, the control module being electrically connected to the acceleration sensor; wherein the control module is used to execute the steps of the shutdown control method in any of the above technical solutions.

[0029] Energy storage devices have the beneficial effects of any of the above-mentioned technical solutions, which will not be elaborated here.

[0030] In some technical solutions, the energy storage device may optionally include a battery module, an external functional module, and a charging / discharging circuit; the charging / discharging circuit is connected in series between the battery module and the external functional module, and a switching device is provided on the charging / discharging circuit; wherein, the control module is used to control the switching device.

[0031] In this technical solution, by controlling the energy storage device to shut down in time during the drop or the initial stage of the collision before an internal short circuit is triggered, and cutting off the external power supply path of the battery module, the problem of product overheating and fire caused by the continuous external discharge of the battery module during collision and drop accidents can be avoided at the source, which is conducive to improving the safety of energy storage device use.

[0032] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0033] Figure 1 A flowchart of a shutdown control method according to an embodiment of the present invention is shown;

[0034] Figure 2 A flowchart of a shutdown control method according to another embodiment of the present invention is shown;

[0035] Figure 3 A flowchart of a shutdown control method according to another embodiment of the present invention is shown;

[0036] Figure 4 A flowchart of a shutdown control method according to another embodiment of the present invention is shown;

[0037] Figure 5 A flowchart of a shutdown control method according to another embodiment of the present invention is shown;

[0038] Figure 6 It shows Figure 1 A detailed schematic diagram of S102 in the middle;

[0039] Figure 7 It shows Figure 1 A detailed schematic diagram of S108 in China;

[0040] Figure 8 A structural block diagram of an energy storage device according to an embodiment of the present invention is shown;

[0041] Figure 9 A schematic diagram of an energy storage device according to an embodiment of the present invention is shown.

[0042] The attached figures are labeled as follows:

[0043] 200: Energy storage device; 210: Battery management system; 211: Control module; 2111: Main control unit; 2112: Analog front-end unit; 212: Accelerometer; 220: Battery module; 230: External functional module; 240: Charging and discharging circuit; 250: Switching device; 260: Fuse. Detailed Implementation

[0044] To better understand the above-described objectives, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, embodiments of the invention may be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0046] With the development of mobile energy storage technology, portable energy storage products are widely used in scenarios without grid coverage, such as outdoor camping, medical rescue, home emergency power backup, and outdoor operations. In actual use, portable energy storage products are susceptible to damage from external forces such as accidental collisions and drops from heights, which can cause damage to their internal structure and electrical components.

[0047] Currently, for collision and drop protection of portable energy storage products, the relevant technologies generally adopt a purely mechanical protection solution: the product shell provides impact buffering, while internal cell fixing brackets and other structural components reinforce the installation position of the cells and components. The physical buffer structure weakens the impact force generated by collisions and drops, reducing the damage to internal components and battery modules.

[0048] However, this type of mechanical protection has obvious drawbacks: the buffering capacity of mechanical structures has an upper limit. When the impact force is large or the drop height is high, it is still difficult to avoid problems such as internal PCB (Printed Circuit Board) breakage, electronic component solder joint detachment, and conductive structure deformation due to compression, which may lead to internal circuit short circuit, causing the product to overheat and catch fire, posing a safety hazard.

[0049] This invention aims to provide a shutdown control method and energy storage device. By adding an acceleration sensor to the battery management system and converting and analyzing the data collected by the acceleration sensor, the drop and collision states of the energy storage device can be accurately identified. Furthermore, when the energy storage device is in a drop or / or collision state, the device can be shut down. Compared to purely mechanical protection methods, this design can promptly shut down the energy storage device during a drop or in the early stages of a collision, before an internal short circuit occurs, cutting off the external power supply path of the battery module. This fundamentally avoids the product overheating and fire problems caused by continuous external discharge of the battery module in collision and drop accidents, thus improving the safety of the energy storage device.

[0050] In the technical solution of this invention, the control module can analyze the data collected by the acceleration sensor. When a sudden change in the data is detected, it determines that the energy storage device is in a drop or collision state, and immediately controls the switching device on the charging and discharging circuit to disconnect, cutting off the power supply path of the battery module to the outside, thereby achieving automatic shutdown and avoiding continuous external discharge of the battery module during collision or drop, which is beneficial to improving safety performance.

[0051] It should be noted that the switching devices in the charging and discharging circuit can be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or relays.

[0052] In addition, the energy storage device of the present invention can be a portable energy storage device (also known as a mobile energy storage device, such as a power bank).

[0053] The following reference Figures 1 to 9 This invention describes a shutdown control method and an energy storage device provided according to some embodiments of the present invention.

[0054] In one embodiment of the present invention, such as Figure 8 As shown, the energy storage device 200 includes a battery management system 210 (BMS), which includes an acceleration sensor 212.

[0055] Optionally, the accelerometer 212 is used to acquire a first raw sample value of the energy storage device 200 in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction. The X-axis, Y-axis, and Z-axis are perpendicular to each other.

[0056] In one specific embodiment, the accelerometer 212 is a triaxial accelerometer to acquire data in three spatial directions.

[0057] Optionally, the battery management system 210 also includes a control module 211. The control module 211 is electrically connected to the acceleration sensor 212. The control module 211 is used to convert and analyze the data collected by the acceleration sensor 212, and can accurately identify the drop state and collision state of the energy storage device 200, and control the energy storage device 200 to shut down when the energy storage device 200 is in a drop state and / or collision state.

[0058] Optionally, the energy storage device 200 has a switching device 250 on its charging and discharging circuit 240, which is used to control the on / off state of the charging and discharging circuit 240. The control module 211 is configured to control the switching device 250 to be in the off state when the energy storage device 200 is in a drop state and / or collision state, so as to shut down the energy storage device 200.

[0059] In one specific embodiment, the switching device 250 is a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0060] In another specific embodiment, the switching device 250 is a relay.

[0061] Optionally, the energy storage device 200 also includes a battery module 220 and an external functional module 230. A charging / discharging circuit 240 is connected in series between the battery module 220 and the external functional module 230. The control module 211 of the battery management system 210 controls the on / off state of the charging / discharging circuit 240.

[0062] Optionally, the external functional module 230 is an inverter.

[0063] Optionally, the external functional module 230 is the main circuit board.

[0064] Optionally, the external functional module 230 is a PV (Photovoltaic) module.

[0065] The active power-off protection mechanism of the present invention can cover all charging and discharging power paths of the energy storage device 200. Regardless of whether the energy storage device 200 is in AC discharge, DC discharge, mains (grid) charging, or photovoltaic charging mode, it can achieve rapid electrical isolation of the battery side in the event of a collision or drop. This avoids the product overheating and fire caused by the continuous discharge of the battery module 220 in collision or drop accidents, thereby improving the safety of the energy storage device 200.

[0066] Optionally, the control module 211 includes a main control unit 2111 and an analog front-end unit 2112. The main control unit 2111 is electrically or communicatively connected to the analog front-end unit 2112. The main control unit 2111 is also electrically or communicatively connected to the accelerometer sensor 212. The analog front-end unit 2112 is electrically or communicatively connected to the switching device 250, and is used to control the on / off state of the switching device 250 to control the on / off state of the charging / discharging circuit 240.

[0067] The main control unit 2111 is configured to: acquire a first raw sample value of the energy storage device 200 in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction through the acceleration sensor 212; and calculate a first acceleration component based on the first raw sample value, a second acceleration component based on the second raw sample value, and a third acceleration component based on the third raw sample value, wherein the X-axis, Y-axis, and Z-axis are perpendicular to each other.

[0068] The current composite acceleration is calculated based on the first acceleration component, the second acceleration component, and the third acceleration component, and the current composite impact value is calculated based on the first original sample value, the second original sample value, and the third original sample value.

[0069] Based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component, it is determined whether the energy storage device 200 is in a drop state, and based on the current composite impact value, it is determined whether the energy storage device 200 is in a collision state.

[0070] The analog front-end unit 2112 is configured to control the energy storage device 200 to shut down when the energy storage device 200 is in a drop state and / or collision state.

[0071] Optionally, the main control unit 2111 is an MCU (Microcontroller Unit).

[0072] Optionally, the analog front end unit 2112 (AFE) is a battery management chip.

[0073] Optionally, the energy storage device 200 also includes a power module. The first terminal of the power module is connected to the charging / discharging circuit 240, the second terminal is connected to the main control unit 2111 of the control module 211, and the third terminal is used for grounding. The power module is used to supply power to the main control unit 2111.

[0074] Optionally, the power supply terminal of the analog front-end unit 2112 is connected to the charging and discharging circuit 240, the communication terminal of the analog front-end unit 2112 is used for communication connection with the switching device 250, and the ground terminal of the analog front-end unit 2112 is used for grounding.

[0075] Optionally, the analog front-end unit 2112 is electrically connected to the battery module 220, and the analog front-end unit 2112 is used to acquire the status data (such as voltage data and / or current data) and temperature data of the battery module 220.

[0076] Optionally, a wake-up circuit is provided between the main control unit 2111 and the analog front-end unit 2112. The main control unit 2111 is used to send control commands to the analog front-end unit 2112, and the analog front-end unit 2112 controls the switching device 250 to be turned on or off according to the control commands.

[0077] Optionally, a fuse 260 is provided on the charging / discharging circuit 240. The fuse 260 is used to blow in the event of a current overload, thereby improving the safety performance of the energy storage device 200.

[0078] In actual use, the energy storage device 200 exists in at least three operating states: First, the energy storage device 200 is in normal working condition. The MCU (Microcontroller Unit) reads the data collected by the accelerometer 212. If no sudden change in the data is detected, the product is in normal use, and the battery module 220 can charge and discharge. Second, when a collision or drop occurs, the MCU reads a sudden change in the data collected by the accelerometer 212, and this change reaches a preset threshold. The MCU then sends a control command to the AFE (Analog Front End 2112). The AFE controls the switching device 250 to be in the off state according to the control command, and the product shuts down, regardless of the BMS (Battery Management System). If any external circuit module of the Battery Management System (BMS) 210 fails and short-circuits, the system ensures that the battery module 220 will not discharge to the outside and cause a fire or explosion. Alternatively, the user or staff can manually restart the energy storage device 200. The BMS performs a self-check on all modules. If no external circuit fault is found (e.g., no voltage sampling abnormality or bus fault), the system controls the energy storage device 200 to start normally. If an abnormal condition is detected (e.g., an abnormal voltage sampling or bus fault), the system controls the energy storage device 200 not to start, ensuring the energy storage device 200 is in a safe state.

[0079] In one embodiment of the present invention, the shutdown control method is applied to the energy storage device 200.

[0080] like Figure 1 As shown, the shutdown control methods include:

[0081] S102, the first original sample value in the X-axis direction, the second original sample value in the Y-axis direction, and the third original sample value in the Z-axis direction of the energy storage device are obtained by the acceleration sensor, and the first acceleration component is calculated based on the first original sample value, the second acceleration component is calculated based on the second original sample value, and the third acceleration component is calculated based on the third original sample value, wherein the X-axis, Y-axis and Z-axis are perpendicular to each other.

[0082] It should be noted that the first, second, and third raw sample values ​​are all raw data obtained through the accelerometer.

[0083] The control module of the battery management system drives the accelerometer to synchronously collect the original sampling data of the energy storage device in the three orthogonal axes (X-axis, Y-axis, and Z-axis) in space according to the preset sampling frequency, and obtains the first original sampling value corresponding to the X-axis, the second original sampling value corresponding to the Y-axis, and the third original sampling value corresponding to the Z-axis, respectively.

[0084] The main control unit calls the preset sensitivity calibration parameters (preset calibration parameters) to linearly convert the raw digital sampled values ​​of each axis into three-axis acceleration components with physical meaning, namely the first acceleration component, the second acceleration component, and the third acceleration component.

[0085] Optionally, based on the third calculation formula, the first acceleration component, the second acceleration component, and the third acceleration component are calculated from the first original sample value, the second original sample value, and the third original sample value.

[0086] The third calculation formula is:

[0087] ;

[0088] G axis The acceleration component is (first acceleration component, second acceleration component, or third acceleration component); Raw is the raw sampled value (first raw sampled value, second raw sampled value, or third raw sampled value); Raw0 is the sensitivity calibration parameter (preset calibration parameter), which is used to characterize the conversion ratio between the raw sampled value and the acceleration component.

[0089] In a specific embodiment, Raw0 is set to 1024 LSB / g, which means that the original sampled digital quantity (original sampled value) corresponding to 1 time the standard gravitational acceleration (g) in a single axis direction is 1024 LSB.

[0090] It should be noted that LSB (Least Significant Bit) represents the least significant bit (the smallest unit of measurement for the output digital value).

[0091] Optionally, after obtaining the original sampled values, the triaxial original sampled values ​​can be filtered first using a sliding window mean filtering algorithm to remove abnormal jump data caused by sensor thermal noise and instantaneous electromagnetic interference before performing subsequent conversion and calculation steps.

[0092] A three-axis synchronous acquisition mechanism is adopted to ensure the time consistency of data on each axis, providing an accurate time reference for subsequent vector synthesis and trend determination. By pre-setting calibration parameters, the digital sampled values ​​(raw sampled values) without physical meaning are converted into standard acceleration physical quantities (acceleration components), completing the mapping from the sensor's raw data to engineering physical quantities. The pre-filtering process can effectively filter out environmental interference, improve the signal-to-noise ratio of the raw data, and reduce the probability of misjudgment in subsequent working condition determination from the data source.

[0093] S104, based on the first acceleration component, the second acceleration component and the third acceleration component, calculates the current composite acceleration, and based on the first original sample value, the second original sample value and the third original sample value, calculates the current composite impact value.

[0094] Based on the principle of spatial vector synthesis, the sum of squares of the three-axis acceleration components is taken as the square root to obtain the current composite acceleration at the current moment. The current composite acceleration is used to characterize the magnitude of the overall composite acceleration experienced by the energy storage device and is not affected by the device's orientation or the sensor's installation direction.

[0095] It should be noted that the acceleration component obtained by converting the original sampled values ​​represents the acceleration produced by non-gravitational external forces (excluding gravitational forces) applied to the object. Therefore, when the energy storage device is at rest, the resultant acceleration is approximately equal to the standard gravitational acceleration g (9.8 m / s²). 2 However, when the energy storage device is in a free fall state, the three-axis acceleration components drop sharply at the same time, and the combined acceleration will be much smaller than the standard gravitational acceleration.

[0096] The current synthetic impact value is calculated based on the triaxial raw sample values ​​(first raw sample value, second raw sample value, and third raw sample value). The current synthetic impact value is used to determine whether the energy storage device is in a collision state in subsequent steps.

[0097] S106, based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component, determine whether the energy storage device is in a drop state, and based on the current composite impact value, determine whether the energy storage device is in a collision state.

[0098] The current composite acceleration is used as the core criterion for judgment. A comprehensive judgment is made in combination with the preset weightlessness threshold, the first preset duration and the trend of triaxial data. If the current composite acceleration is less than the preset weightlessness threshold, the first duration is greater than or equal to the first preset duration, and the first acceleration component, the second acceleration component and the third acceleration component all show a decreasing trend, the energy storage device is determined to be in a drop state.

[0099] The current synthetic impact value is used as the core criterion for judgment, and a comprehensive judgment is made by combining the preset impact threshold, the second preset duration, and the rate of change of the current synthetic impact value. If the current synthetic impact value is greater than the preset impact threshold, the second duration is greater than or equal to the second preset duration, and the rate of change of the current synthetic impact value is greater than or equal to the rate of change threshold, the energy storage device is determined to be in a collision state.

[0100] S108, in the event that the energy storage device is in a drop state and / or collision state, control the energy storage device to shut down.

[0101] When the energy storage device is in a drop and / or collision state, the control unit immediately outputs a power-off control command, drives the switching device in the charging and discharging circuit to disconnect, cuts off the power supply path between the battery module and the external functional module, stops the battery module from charging and discharging externally, and realizes the active shutdown of the energy storage device.

[0102] This invention aims to provide a shutdown control method. By adding an accelerometer to the battery management system and converting and analyzing the data collected by the accelerometer, the method can accurately identify the drop and collision states of the energy storage device. Furthermore, when the energy storage device is in a drop or / or collision state, the method controls the device to shut down. Compared to purely mechanical protection methods, this design can promptly shut down the energy storage device during a drop or in the early stages of a collision, before an internal short circuit occurs. This cuts off the external power supply path of the battery module, fundamentally preventing overheating and fire problems caused by continuous external discharge of the battery module during collisions or drops, thus improving the safety of energy storage devices.

[0103] In some embodiments, optionally, such as Figure 2 As shown, based on the first acceleration component, the second acceleration component, and the third acceleration component, the current composite acceleration is calculated, including:

[0104] S1042, based on the first calculation formula, calculates the current composite acceleration according to the first acceleration component, the second acceleration component and the third acceleration component.

[0105] The first calculation formula is:

[0106] ;

[0107] a 合 Given the current synthesis acceleration, a x For the first acceleration component, a y For the second acceleration component, a z This is the third acceleration component.

[0108] Based on the principle of spatial vector synthesis, the sum of squares of the three-axis acceleration components is taken as the square root to obtain the current composite acceleration at the current moment. The calculation method is simple and helps to improve data processing efficiency.

[0109] The current synthetic acceleration is used to assess whether the energy storage device is in a drop condition in subsequent steps.

[0110] In some embodiments, optionally, such as Figure 3 As shown, based on the first, second, and third original sampled values, the current synthetic impact value is calculated, including:

[0111] S1044, based on the second calculation formula, calculates the current synthetic impact value according to the first original sample value, the second original sample value and the third original sample value.

[0112] The second calculation formula is as follows:

[0113] ;

[0114] G peak For the current synthetic impact value, Raw x The first raw sample value, Raw y The second raw sample value, Raw z The third raw sample value is Raw0, which is a preset calibration parameter.

[0115] The current synthetic impact value is calculated based on the three-axis original sample values ​​(first original sample value, second original sample value and third original sample value). The calculation method is simple and helps to improve data processing efficiency.

[0116] The current composite impact value is used to determine whether the energy storage device is in a collision state in subsequent steps.

[0117] In some embodiments, optionally, preset calibration parameters are used to characterize the conversion ratio between the original sampled values ​​and the acceleration components.

[0118] Optionally, based on the third calculation formula, the first acceleration component, the second acceleration component, and the third acceleration component are calculated from the first original sample value, the second original sample value, and the third original sample value.

[0119] The third calculation formula is:

[0120] ;

[0121] G axis The acceleration component is (first acceleration component, second acceleration component, or third acceleration component); Raw is the raw sampled value (first raw sampled value, second raw sampled value, or third raw sampled value); Raw0 is the sensitivity calibration parameter (preset calibration parameter), which is used to characterize the conversion ratio between the raw sampled value and the acceleration component.

[0122] By setting preset calibration parameters, digital sampled values ​​(raw sampled values) without physical meaning can be converted into standard acceleration physical quantities (acceleration components), completing the mapping from raw sensor data to engineering physical quantities, which facilitates the analysis of triaxial acceleration components in subsequent steps.

[0123] In some embodiments, optionally, such as Figure 4 As shown, based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component, it is determined whether the energy storage device is in a drop condition, including:

[0124] S1062, when the current composite acceleration is less than the preset weightlessness threshold, the first duration is greater than or equal to the first preset duration, and the first acceleration component, the second acceleration component, and the third acceleration component all show a decreasing trend, it is determined that the energy storage device is in a drop state, wherein the first duration is the duration during which the current composite acceleration is continuously less than the preset weightlessness threshold.

[0125] In the technical solution of the present invention, a triple judgment mechanism of "amplitude verification - duration verification - trend verification" is adopted. When all three conditions are met at the same time, it is determined that the energy storage device is in a drop state; when at least one condition is not met, it is determined that the energy storage device is not in a drop state.

[0126] The first condition for determining that an energy storage device is in a drop condition is: the current composite acceleration is less than the preset weightlessness threshold. This first condition is used to reflect the "amplitude test," which corresponds to the physical characteristic of the device approaching complete weightlessness during free fall and is the core identification basis for drop conditions.

[0127] The second condition for determining that an energy storage device is in a drop state is: the first duration is greater than or equal to the first preset duration. The second condition is used to reflect the "duration verification". The first duration being greater than or equal to the first preset duration is a time-dimensional judgment condition. By setting a lower limit for the duration of continuous weightlessness, the interference signal of brief weightlessness caused by slight shaking and instantaneous turbulence of the device is filtered out.

[0128] The third condition for determining whether an energy storage device is in a fall state is: the first acceleration component, the second acceleration component, and the third acceleration component all show a decreasing trend. This third condition is used to reflect "trend verification." The decreasing trend of all three-axis acceleration components serves as a condition to prevent misjudgment in the trend dimension. In a real free fall, the projection of gravity on the three axes decays synchronously, and the overall three-axis components show a synchronous decreasing change pattern, which can distinguish between a real fall and a non-fall scenario where the device tilts or the gravity component shifts between axes.

[0129] Synthetic acceleration amplitude determination captures the core physical essence of weightlessness in free fall, duration determination filters out instantaneous noise interference, and three-axis trend determination eliminates misjudgment scenarios such as manual flipping and tilting of equipment. The combination of these three can significantly improve the accuracy of fall state recognition, ensuring that real fall accidents are not missed and that false triggers in daily use are effectively avoided.

[0130] S1064, if the current synthetic acceleration is greater than or equal to the preset weightlessness threshold, or the first duration is less than the first preset duration, or at least one of the first acceleration component, the second acceleration component, and the third acceleration component shows a non-decreasing trend, it is determined that the energy storage device is not in a drop state.

[0131] If the current synthetic acceleration is greater than or equal to the preset weightlessness threshold, it means that the energy storage device is still under effective support and has not entered a weightless falling state, thus directly ruling out the possibility of falling.

[0132] If the first duration of the weightlessness state is less than the first preset duration, it indicates that the weightlessness signal is an instantaneous interference and does not meet the time characteristics of a real fall, thus excluding the fall state.

[0133] If the data of at least one of the three-axis acceleration components does not show a decreasing trend, that is, there is a characteristic of constant single-axis value and continuous unidirectional increase, it indicates that the energy storage device is in attitude adjustment rather than free fall, and the fall judgment is ruled out.

[0134] A triple-judgment mechanism of "amplitude verification, duration verification, and trend verification" is adopted. If all three conditions are met simultaneously, the energy storage device is determined to be in a drop condition; if at least one condition is not met, the energy storage device is determined not to be in a drop condition. This design can significantly improve the accuracy of drop condition identification, ensuring that real drop accidents are not missed and effectively avoiding false triggers in daily use.

[0135] In some embodiments, the preset weight loss threshold is optionally 0.3g to 0.8g.

[0136] It should be noted that g represents gravitational acceleration.

[0137] In one specific embodiment, the preset weight loss threshold is 0.3g.

[0138] In one specific embodiment, the preset weight loss threshold is 0.4g.

[0139] In one specific embodiment, the preset weight loss threshold is 0.5g.

[0140] In one specific embodiment, the preset weight loss threshold is 0.6g.

[0141] In one specific embodiment, the preset weight loss threshold is 0.7g.

[0142] In one specific embodiment, the preset weight loss threshold is 0.8g.

[0143] By limiting the range of preset weightlessness threshold values, it is possible to balance drop detection sensitivity and anti-interference capability. It can effectively filter out small acceleration fluctuations in non-drop scenarios such as daily handling, slight equipment shaking, and vehicle bumps, and prevent accidental triggering of shutdown protection during normal use, which helps to improve the accuracy and reliability of drop recognition.

[0144] Optionally, the first preset duration is 20ms to 50ms.

[0145] In one specific embodiment, the first preset duration is 20ms.

[0146] In one specific embodiment, the first preset duration is 30ms.

[0147] In one specific embodiment, the first preset duration is 40ms.

[0148] In one specific embodiment, the first preset duration is 50ms.

[0149] By limiting the range of values ​​for the first preset duration, both interference signal filtering capability and response speed can be taken into account. This can effectively filter out sensor thermal noise and extremely short-duration weightlessness jump signals caused by instantaneous electromagnetic interference, eliminate false judgments caused by noise, and improve the accuracy and reliability of drop detection.

[0150] It should be noted that the core characteristics of a normal free fall of an energy storage device are: when the energy storage device is falling freely in the air, it is completely weightless and has no fixed force direction. The original sampled values ​​of the X, Y, and Z axes will decrease synchronously and uniformly, and the data of the three axes will all approach 0. There will be no directional deviation phenomenon where one axis is continuously larger or smaller, and there is no fixed attitude tendency.

[0151] In some embodiments, optionally, such as Figure 5 As shown, based on the current synthetic impact value, determining whether the energy storage device is in a collision state includes:

[0152] S1066, if the current synthetic impact value is greater than the preset impact threshold, the second duration is greater than or equal to the second preset duration, and the rate of change of the current synthetic impact value is greater than or equal to the rate of change threshold, the energy storage device is determined to be in a collision state, wherein the second duration is the duration during which the current synthetic impact value is greater than the preset impact threshold.

[0153] In the technical solution of the present invention, a triple judgment mechanism of "impact amplitude verification - duration verification - rate of change verification" is adopted. When all three conditions are met at the same time, it is determined that the energy storage device is in a collision state; when at least one condition is not met, it is determined that the energy storage device is not in a collision state.

[0154] The first condition for determining that an energy storage device is in a collision state is: the current composite impact value is greater than the preset impact threshold. This first condition is used to reflect the "impact amplitude test". The current composite impact value being greater than the preset impact threshold is the core strength judgment condition, which quantifies the peak acceleration level of the impact on the energy storage device. It corresponds to the critical damage threshold that the current impact may cause the internal printed circuit board to break or the component solder joints to fall off. Minor bumps below the preset impact threshold will not trigger the protection action.

[0155] The second condition for determining that the energy storage device is in a collision state is: the second duration is greater than or equal to the second preset duration. The second condition is used to reflect the "duration verification". The second duration being greater than or equal to the second preset duration is a time-dimensional verification condition. By setting the minimum duration of the impact signal, abnormal spikes at single sampling points caused by sensor thermal noise and instantaneous electromagnetic interference are filtered out, ensuring that the triggering judgment is a real physical impact rather than an interference signal.

[0156] The third condition for determining whether an energy storage device is in a collision state is: the rate of change of the current synthetic impact value is greater than or equal to the rate of change threshold. This third condition is used to reflect the "rate of change verification." The rate of change of the current synthetic impact value being greater than or equal to the rate of change threshold is a dynamic characteristic judgment condition, characterizing the steepness of the impact signal rise. The core physical characteristics of a real hard collision are an instantaneous jump in impact force and an extremely high rate of signal change, while the acceleration changes gradually and the rate of change is low in non-collision scenarios such as slow compression and equipment attitude adjustment. This distinguishes between dynamic instantaneous collisions and static slow forces, thereby avoiding the possibility of misjudgment.

[0157] The entire set of judgment rules is based on pure numerical comparison logic, and the algorithm is simple to implement and has low computational complexity.

[0158] S1068, if the current synthetic impact value is less than or equal to the preset impact threshold, or the second duration is less than the second preset duration, or the rate of change of the current synthetic impact value is less than the rate of change threshold, it is determined that the energy storage device is not in a collision state.

[0159] If the current synthetic impact value is less than or equal to the preset impact threshold, it means that the current impact intensity has not reached the critical value for internal structural damage, there is no collision safety risk, and the collision state is directly excluded.

[0160] If the second duration is less than the second preset duration, it indicates that the collected signal is a transient interference noise and does not have the pulse duration characteristics of a real collision, and is therefore determined to be a non-collision condition.

[0161] If the rate of change of the current synthetic impact value is less than the rate of change threshold, it indicates that the acceleration change process is gradual and belongs to a normal attitude adjustment scenario such as equipment tilting and slow force application, rather than an instantaneous hard collision, thus excluding the collision state.

[0162] A triple-judgment mechanism of "impact amplitude verification, duration verification, and rate of change verification" is adopted. If all three conditions are met simultaneously, the energy storage device is determined to be in a collision state; if at least one condition is not met, the energy storage device is determined not to be in a collision state. This design significantly improves the accuracy of collision state identification and reduces the possibility of false positives.

[0163] Optionally, the preset impact threshold is 3G. It should be noted that in the pre-set mapping relationship, when the synthesized impact value is 1G, the corresponding original sampled value is 1024 LSB. Therefore, when the synthesized impact value is 3G, the corresponding original sampled value is 3072 LSB.

[0164] Optionally, the second preset duration is 10ms.

[0165] Optionally, the rate of change of the current synthetic impact value can be calculated based on the fourth calculation formula.

[0166] The fourth calculation formula is:

[0167] ;

[0168] Where J is the rate of change of the current composite impact value; ΔG is the change in the composite impact value; Δt is the change in time; G n The synthesized impact value at the current sampling point (current synthesized impact value); G n-1 is the synthetic impact value corresponding to the previous sampling time; T is the sampling period of the accelerometer.

[0169] Optionally, the accelerometer has a sampling frequency of 100Hz to 200Hz, corresponding to a sampling period of 5ms to 10ms.

[0170] Optionally, the rate of change threshold is 0.1 G / ms.

[0171] In some embodiments, optionally, such as Figure 6As shown, S102 (acquiring a first raw sample value in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction from the energy storage device via an accelerometer, and calculating a first acceleration component based on the first raw sample value, a second acceleration component based on the second raw sample value, and a third acceleration component based on the third raw sample value) includes:

[0172] S1022, the first raw sample value of the energy storage device in the X-axis direction, the second raw sample value in the Y-axis direction and the third raw sample value in the Z-axis direction are obtained by the acceleration sensor.

[0173] It should be noted that the first, second, and third raw sample values ​​are all raw data obtained through the accelerometer.

[0174] The control module of the battery management system drives the accelerometer to synchronously collect the original sampling data of the energy storage device in the three orthogonal axes (X-axis, Y-axis, and Z-axis) in space according to the preset sampling frequency, and obtains the first original sampling value corresponding to the X-axis, the second original sampling value corresponding to the Y-axis, and the third original sampling value corresponding to the Z-axis, respectively.

[0175] S1024 performs filtering on the first, second, and third original sampled values ​​to remove abnormal noise.

[0176] Optionally, after obtaining the original sampled values, the triaxial original sampled values ​​can be filtered first using a sliding window mean filtering algorithm to remove abnormal jump data caused by sensor thermal noise and instantaneous electromagnetic interference before performing subsequent conversion and calculation steps.

[0177] Optionally, the filtering process employs a sliding window mean filtering algorithm, performing independent and parallel processing on the original triaxial sampled values. The specific implementation process is as follows:

[0178] Independent sliding data windows are configured for the first, second, and third original sampled values. The size of the sliding data window is preset to 5 to 15 consecutive sampling points. In this embodiment, the sampling frequency of the accelerometer is set to 1kHz, corresponding to a window time span of 5ms to 15ms; the window size can be adjusted according to the interference intensity of the device's usage scenario.

[0179] Each time a new raw sample value is collected, it is stored at the end of the corresponding axis sliding window, while the earliest sample data at the beginning of the window is removed. This allows the window to slide forward and update point by point as the sampling progresses, always retaining the data of the most recent N sample points.

[0180] The arithmetic mean of all sampled data within the current sliding window is taken, and the arithmetic mean is used as the original sampled value after filtering at the current time, and then output to the subsequent acceleration component conversion and composite value calculation stages.

[0181] S1026, based on the first original sampled value after filtering, the first acceleration component is calculated, based on the second original sampled value after filtering, the second acceleration component is calculated, and based on the third original sampled value after filtering, the third acceleration component is calculated.

[0182] The main control unit calls the preset sensitivity calibration parameters (preset calibration parameters) to linearly convert the raw digital sampled values ​​of each axis into three-axis acceleration components with physical meaning, namely the first acceleration component, the second acceleration component, and the third acceleration component.

[0183] Optionally, based on the third calculation formula, the first acceleration component, the second acceleration component, and the third acceleration component are calculated from the first original sample value, the second original sample value, and the third original sample value.

[0184] The third calculation formula is:

[0185] ;

[0186] G axis The acceleration component is (first acceleration component, second acceleration component, or third acceleration component); Raw is the raw sampled value (first raw sampled value, second raw sampled value, or third raw sampled value); Raw0 is the sensitivity calibration parameter (preset calibration parameter), which is used to characterize the conversion ratio between the raw sampled value and the acceleration component.

[0187] A three-axis synchronous acquisition mechanism is adopted to ensure the time consistency of data on each axis, providing an accurate time reference for subsequent vector synthesis and trend determination. By pre-setting calibration parameters, the digital sampled values ​​(raw sampled values) without physical meaning are converted into standard acceleration physical quantities (acceleration components), completing the mapping from the sensor's raw data to engineering physical quantities. The pre-filtering process can effectively filter out environmental interference, improve the signal-to-noise ratio of the raw data, and reduce the probability of misjudgment in subsequent working condition determination from the data source.

[0188] In some embodiments, optionally, such as Figure 8 As shown, the energy storage device 200 has a switching device 250 on its charging and discharging circuit 240.

[0189] like Figure 7 As shown, S108 (controlling the energy storage device to shut down in the event of a drop and / or collision) includes:

[0190] S1082, when the energy storage device is in a drop state and / or collision state, the control switching device is in the open state.

[0191] When the energy storage device is in a drop and / or collision state, the control unit immediately outputs a power-off control command, drives the switching device in the charging and discharging circuit to disconnect, cuts off the power supply path between the battery module and the external functional module, stops the battery module from charging and discharging externally, and realizes the active shutdown of the energy storage device.

[0192] By promptly shutting down the energy storage device during a drop or in the early stages of a collision, before an internal short circuit is triggered, and cutting off the external power supply path of the battery module, the problem of product overheating and fire caused by continuous external discharge of the battery module during collisions and drops can be avoided at the source, which is conducive to improving the safety of energy storage devices.

[0193] In one embodiment of the present invention, such as Figure 8 and Figure 9 As shown, the energy storage device 200 includes a battery management system 210, which includes a control module 211 and an acceleration sensor 212. The control module 211 is electrically connected to the acceleration sensor 212.

[0194] The control module 211 is used to execute the steps of the shutdown control method in any of the above embodiments.

[0195] The energy storage device 200 has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0196] In one embodiment of the present invention, such as Figure 9 As shown, the energy storage device 200 also includes a battery module 220, an external functional module 230, and a charging / discharging circuit 240. The charging / discharging circuit 240 is connected in series between the battery module 220 and the external functional module 230, and a switching device 250 is provided on the charging / discharging circuit 240. The control module 211 is used to control the switching device 250.

[0197] Switching device 250 is used to control the on / off state of charging / discharging circuit 240. Control module 211 is configured to control switching device 250 to be in the off state when energy storage device 200 is in a drop state and / or collision state, so as to shut down energy storage device 200.

[0198] By promptly shutting down the energy storage device 200 and cutting off the external power supply path of the battery module 220 during the drop or initial stage of the collision before an internal short circuit is triggered, the product overheating and fire caused by the continuous external discharge of the battery module 220 during collision and drop accidents can be avoided at the source, which is conducive to improving the safety of the energy storage device 200.

[0199] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0200] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0201] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0202] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shutdown control method, characterized in that, Applied to an energy storage device, the energy storage device including a battery management system, the battery management system including an acceleration sensor, the shutdown control method includes: The energy storage device acquires a first raw sample value in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction using the acceleration sensor. A first acceleration component is calculated based on the first raw sample value, a second acceleration component is calculated based on the second raw sample value, and a third acceleration component is calculated based on the third raw sample value. The X-axis, Y-axis, and Z-axis are perpendicular to each other. Based on the first acceleration component, the second acceleration component, and the third acceleration component, the current composite acceleration is calculated, and based on the first original sample value, the second original sample value, and the third original sample value, the current composite impact value is calculated. Based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component, it is determined whether the energy storage device is in a drop state, and based on the current composite impact value, it is determined whether the energy storage device is in a collision state. In the event that the energy storage device is in the drop state and / or the collision state, the energy storage device is controlled to shut down.

2. The shutdown control method according to claim 1, characterized in that, The calculation of the current composite acceleration based on the first acceleration component, the second acceleration component, and the third acceleration component includes: Based on the first calculation formula, the current composite acceleration is calculated according to the first acceleration component, the second acceleration component, and the third acceleration component; The first calculation formula is: ； a 合 Let a be the current synthetic acceleration. x For the first acceleration component, a y For the second acceleration component, a z This refers to the third acceleration component.

3. The shutdown control method according to claim 1, characterized in that, The calculation of the current synthetic impact value based on the first original sample value, the second original sample value, and the third original sample value includes: Based on the second calculation formula, the current synthetic impact value is calculated according to the first original sample value, the second original sample value, and the third original sample value; The second calculation formula is as follows: ； G peak For the current synthetic impact value, Raw x For the first raw sample value, Raw y The second raw sample value, Raw z The third raw sample value is defined as Raw0, which is a preset calibration parameter.

4. The shutdown control method according to any one of claims 1 to 3, characterized in that, Determining whether the energy storage device is in a drop state based on the current composite acceleration, the first acceleration component, the second acceleration component, and the third acceleration component includes: When the current composite acceleration is less than a preset weightlessness threshold, the first duration is greater than or equal to the first preset duration, and the first acceleration component, the second acceleration component, and the third acceleration component all show a decreasing trend, the energy storage device is determined to be in the drop state, wherein the first duration is the duration during which the current composite acceleration is continuously less than the preset weightlessness threshold. If the current synthetic acceleration is greater than or equal to the preset weightlessness threshold, or the first duration is less than the first preset duration, or at least one of the first acceleration component, the second acceleration component, and the third acceleration component shows a non-decreasing trend, it is determined that the energy storage device is not in the drop state.

5. The shutdown control method according to claim 4, characterized in that, The preset weight loss threshold is 0.3g to 0.8g; and / or the first preset duration is 20ms to 50ms.

6. The shutdown control method according to any one of claims 1 to 3, characterized in that, Determining whether the energy storage device is in a collision state based on the current synthetic impact value includes: If the current synthetic impact value is greater than a preset impact threshold, the second duration is greater than or equal to a second preset duration, and the rate of change of the current synthetic impact value is greater than or equal to a rate of change threshold, the energy storage device is determined to be in the collision state, wherein the second duration is the duration during which the current synthetic impact value is continuously greater than the preset impact threshold; If the current synthetic impact value is less than or equal to the preset impact threshold, or the second duration is less than the second preset duration, or the rate of change of the current synthetic impact value is less than the rate of change threshold, then the energy storage device is determined not to be in the collision state.

7. The shutdown control method according to any one of claims 1 to 3, characterized in that, The process of acquiring a first raw sample value in the X-axis direction, a second raw sample value in the Y-axis direction, and a third raw sample value in the Z-axis direction from the energy storage device via the accelerometer, and calculating a first acceleration component based on the first raw sample value, a second acceleration component based on the second raw sample value, and a third acceleration component based on the third raw sample value, includes: The energy storage device acquires the first raw sample value in the X-axis direction, the second raw sample value in the Y-axis direction, and the third raw sample value in the Z-axis direction using the acceleration sensor. The first, second, and third original sampled values ​​are filtered to remove abnormal noise. The first acceleration component is obtained based on the first original sampled value after filtering; the second acceleration component is obtained based on the second original sampled value after filtering; and the third acceleration component is obtained based on the third original sampled value after filtering.

8. The shutdown control method according to any one of claims 1 to 3, characterized in that, The energy storage device is equipped with a switching device in its charging and discharging circuit. The step of controlling the energy storage device to shut down when the energy storage device is in the drop state and / or the collision state includes: When the energy storage device is in the drop state and / or the collision state, the switching device is controlled to be in the open state.

9. An energy storage device, characterized in that, The system includes a battery management system, which includes a control module and an acceleration sensor, wherein the control module is electrically connected to the acceleration sensor. The control module is used to execute the steps of the shutdown control method as described in any one of claims 1 to 8.

10. The energy storage device according to claim 9, characterized in that, It also includes battery modules, external functional modules, and charging / discharging circuits; The charging and discharging circuit is connected in series between the battery module and the external functional module, and a switching device is provided on the charging and discharging circuit; The control module is used to control the switching device.

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