Battery abnormity early warning device and battery abnormity early warning method

Abstract

The invention relates to a battery abnormity early warning device and a battery abnormity early warning method, and relates to the technical field of battery safety. The battery abnormity early warning device comprises a battery parameter detector used for detecting operation parameters of a battery; the switch control element is connected to a power supply circuit of the battery and is used for controlling on-off of the power supply circuit; the early warning information sending module is used for sending early warning information; the controller is electrically connected with the battery parameter detector, the switch control element and the early warning information sending module and used for obtaining the operation parameters, determining whether the change condition of the operation parameters meets a preset condition or not, responding to the change condition of the operation parameters meeting the preset condition, determining that the battery is in an abnormal state and sending early warning information. And an exception handling mode is determined based on the current use scene, and the exception handling mode at least comprises the steps of controlling the switch control element to disconnect the power supply circuit and controlling the early warning information sending module to send early warning information. According to the scheme, abnormal early warning of the battery can be effectively realized, and the safety of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery safety. Specifically, the present invention relates to a battery abnormal warning device and a battery abnormal warning method. Background Art

[0002] With the popularization of electric vehicles, higher requirements are also put forward for the safety of batteries in electric vehicles.

[0003] When the battery is in an abnormal state, it is easy to cause the occurrence of thermal runaway. Thermal runaway refers to a chain reaction phenomenon triggered by various inducements. A large amount of heat and harmful gases emitted by thermal runaway will cause the battery to catch fire and explode. Battery thermal runaway often starts from the decomposition of the negative electrode SEI film inside the battery cell, and then the separator decomposes and melts, resulting in the reaction between the negative electrode and the electrolyte. Subsequently, both the positive electrode and the electrolyte will decompose, thus triggering a large-scale internal short circuit, causing the electrolyte to burn, and then spreading to other battery cells, resulting in serious thermal runaway and causing the entire battery pack to catch fire. Therefore, if the abnormal warning of the battery can be effectively realized, the occurrence of thermal runaway can be avoided, and the safety of the battery can be improved.

[0004] In addition, if the volume of the battery abnormal warning device is too large, it is not convenient to install and use, especially not convenient to use in small electric vehicles.

[0005] Furthermore, the abnormal warning of the battery needs to have strong stability to maintain long-term and stable abnormal warning. Summary of the Invention

[0006] The present application provides a battery abnormal warning device and a battery abnormal warning method, aiming to solve at least one of the above technical defects. The technical solutions adopted by the present application are as follows:

[0007] In the first aspect, an embodiment of the present application provides a battery abnormal warning device. The warning device is powered by the battery to be monitored, and the device includes:

[0008] A battery parameter detector for detecting the operating parameters of the battery;

[0009] A switch control element connected to the power supply circuit of the battery for controlling the on / off of the power supply circuit;

[0010] A warning information sending module for sending warning information;

[0011] A controller, electrically connected to a battery parameter detector, a switch control element, and a warning information sending module respectively, is configured to obtain operating parameters, determine whether the change of the operating parameters meets a preset condition, in response to the change of the operating parameters meeting the preset condition, determine that the battery is in an abnormal state, and determine an abnormal handling method based on the current usage scenario. The abnormal handling method at least includes controlling the switch control element to disconnect the power supply circuit and controlling the warning information sending module to send a warning information.

[0012] Optionally, the battery parameter detector includes at least one of the following:

[0013] A temperature detection element;

[0014] A voltage detection element;

[0015] Wherein, the temperature detection element is arranged at at least one specified detection position of the battery for detecting the surface temperature of the battery;

[0016] The voltage detection element is connected to the power supply circuit for detecting the voltage of the power supply circuit.

[0017] Optionally, the specified detection position includes the negative electrode position of the battery;

[0018] Each component in the warning device is integrated on a control board, the control board is fixed at a position adjacent to the battery, and the detection probe of the temperature detection element is closely attached to the negative electrode of the battery.

[0019] Optionally, the warning information sending module is any one of a signal display component, a wired connection module, or a wireless connection module. The wired connection module or the wireless connection module is configured to establish a communication connection with a user terminal and send a warning information.

[0020] In a second aspect, an embodiment of the present application provides a method for warning of battery abnormality, the method includes:

[0021] Detecting the operating parameters of the battery;

[0022] Determining whether the change of the operating parameters meets a preset condition;

[0023] In response to the change of the operating parameters meeting the preset condition, determining that the battery is in an abnormal state, and determining an abnormal handling method based on the current usage scenario. The abnormal handling method at least includes controlling the power supply circuit of the battery to be disconnected and sending a warning information to the user terminal.

[0024] Optionally, the current usage scenario includes a driving scenario and a non-driving scenario. Based on the abnormal state and the current usage scenario, determining the abnormal handling method includes:

[0025] In response to being in a non-driving scenario, controlling the power supply circuit of the battery to be disconnected;

[0026] Send a warning message in response to being in a driving scenario.

[0027] Optionally, the operating parameters include the temperature of the battery and / or the voltage of the power supply circuit;

[0028] The preset conditions include:

[0029] The change rate of the operating parameter is not lower than the preset parameter change rate threshold.

[0030] Optionally, the above method further includes:

[0031] Obtain the circuit parameters of the power supply circuit;

[0032] Determine the corresponding parameter change rate threshold based on the circuit parameters.

[0033] Optionally, the circuit parameters include the output power, and the output power is positively correlated with the corresponding parameter change rate threshold.

[0034] Optionally, the above method further includes any one of the following:

[0035] Determine the current usage scenario based on the information of the usage scenario returned by the user terminal;

[0036] Determine the current usage scenario based on the operating parameters.

[0037] The beneficial effects brought by the technical solution provided by the embodiments of the present application are:

[0038] The solution provided by the embodiments of the present application detects the operating parameters of the battery, determines the state of the battery based on whether the operating parameters meet the preset conditions, and in response to the battery being in an abnormal state, determines the abnormal handling method based on the current usage scenario. The abnormal handling method at least includes controlling the power supply circuit of the battery to disconnect and sending a warning message to the user terminal. Based on this solution, the abnormal state of the battery can be effectively monitored, and corresponding abnormal handling methods can be used to achieve warning, improving the safety of the battery. Description of the Drawings

[0039] Figure 1 It is the structural diagram of the battery abnormal warning device provided by the embodiments of the present application;

[0040] Figure 2 It is the installation structure schematic diagram of the abnormal warning device provided by the embodiments of the present application.

[0041] Figure 3 It is the circuit structure schematic diagram of the abnormal warning device provided by the embodiments of the present application.

[0042] Figure 4 It is the structural schematic diagram of the abnormal warning device provided in the embodiments of the present application.

[0043] Figure 5 It is a schematic flowchart of the abnormal warning method provided by the embodiment of the present application;

[0044] Figure 6 It is a curve graph showing the change of the temperature on the surface of the battery negative electrode over time obtained from experimental tests at different discharge rates;

[0045] Figure 7 It is a curve graph showing the change of voltage over time obtained from experimental tests at different discharge rates;

[0046] Figure 8 It is obtained by simulating with COMSOL software, and it is a curve graph showing the change of the temperature on the surface of the battery negative electrode over time at different discharge rates;

[0047] Figure 9 It is obtained by simulating with COMSOL software, and it is a curve graph showing the change of voltage over time at different discharge rates. Specific embodiments

[0048] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. For those where specific techniques or conditions are not indicated in the examples, they shall be carried out according to the techniques or conditions described in the literature in the art or according to the product specifications.

[0049] Figure 1 It shows a schematic structural diagram of a battery abnormal warning device provided by the embodiment of the present application. As Figure 1 shown, the device includes:

[0050] A battery parameter detector, which is used to detect the operating parameters of the battery;

[0051] A switch control element, which is connected to the power supply circuit of the battery and is used to control the on-off of the power supply circuit;

[0052] A warning information sending module, which is used to send warning information;

[0053] A controller, which is electrically connected to the battery parameter detector, the switch control element and the warning information sending module respectively, and is used to obtain the operating parameters, determine whether the change of the operating parameters meets the preset conditions, in response to the change of the operating parameters meeting the preset conditions, determine that the battery is in an abnormal state, and determine the abnormal handling method based on the current usage scenario. The abnormal handling method at least includes controlling the switch control element to disconnect the power supply circuit and controlling the warning information sending module to send warning information.

[0054] Among them, the abnormal warning device provided by the present application can be directly powered by the battery it monitors, reducing the dependence on external circuits.

[0055] The battery involved in this example can be various types of batteries used in electric vehicles. As an example, the battery can be a lithium-ion battery for small vehicles.

[0056] In the embodiments of this application, the battery parameter detector can be various forms of detection elements for detecting the operating parameters of the battery. The operating parameters can reflect the operating state of the battery, and based on the operating parameters, it can be determined whether the battery is in an abnormal state.

[0057] The switch control element is connected to the power supply circuit of the battery. Through the switch control element, the power supply circuit can be controlled to be turned on or off. By timely disconnecting the power supply circuit, the power supply of the battery can be stopped, avoiding thermal runaway caused by continuous power supply in an abnormal state.

[0058] As an example, the switch control element can include but is not limited to various forms of relays, such as a switch-type relay, or a digital RTD converter (RTD-to-Digital Converter).

[0059] The warning information sending module can be a signal display component, such as an indicator light, a buzzer, etc. The warning information can be at least one type of prompt information such as light and electricity, sound, etc.

[0060] The warning information sending module can also be a communication module for establishing communication with various forms of user terminals and sending the warning information to the user terminals. The warning information can be various forms of prompt information such as text, audio, or video, used to prompt the user that the battery is in an abnormal state and timely measures need to be taken.

[0061] The controller can obtain the operating parameters detected by the battery parameter detector and determine the state of the battery based on whether the operating parameters meet the preset conditions.

[0062] Among them, the preset conditions can be set according to experiments and / or experience. When the operating parameters meet the preset conditions, it can be determined that the battery is in an abnormal state, and when the operating parameters do not meet the preset conditions, it can be determined that the battery is in a normal state.

[0063] When it is determined that the battery is in an abnormal state, the corresponding abnormal handling method can be selected according to the current usage scenario to meet the requirements for abnormal handling in different scenarios.

[0064] The abnormal handling method can include controlling the switch control element to disconnect the power supply circuit, thereby being able to stop the power supply of the battery and avoiding thermal runaway caused by continuous power supply in an abnormal state.

[0065] The abnormal handling method can also include controlling the warning information sending module to send warning information to prompt the user that the battery is in an abnormal state and take timely measures.

[0066] In an alternative embodiment of the present application, the battery parameter detector includes at least one of the following:

[0067] A temperature detection element;

[0068] A voltage detection element;

[0069] Among them, the temperature detection element is disposed at at least one specified detection position of the battery for detecting the surface temperature of the battery;

[0070] The voltage detection element is connected to the power supply circuit for detecting the voltage of the power supply circuit.

[0071] Among them, the battery parameter detector may include a temperature detection element. The temperature detection element may include, but is not limited to, discrete or integrated temperature sensors such as thermocouples and digital temperature sensors. Its sampling rate should be ≥10Hz, and the temperature accuracy should be <0.1°C. The probe of the temperature detection element can be close to the battery surface to collect the temperature of the battery surface.

[0072] Since there may be certain differences in the temperatures at different positions on the battery surface, to more accurately reflect the actual temperature of the battery surface, at least one specified detection position can be preset, and the temperature detection element is disposed at the specified detection position to detect the surface temperature of the battery at the corresponding position.

[0073] As an example, multiple specified detection positions can be set on the battery surface, and the average value of the temperatures collected from the multiple specified detection positions is taken as the actual temperature of the battery surface.

[0074] The voltage detection element can be connected to the power supply circuit to continuously detect the voltage of the power supply circuit. In this example, the accuracy of the voltage detection element should be not less than 0.001V, and the voltage measurement range should be 0 - 36V.

[0075] In an alternative embodiment of the present application, the specified detection position includes the negative electrode position of the battery;

[0076] Each component in the warning device is integrated on the control board. The control board is fixed at a position adjacent to the battery, and the detection probe of the temperature detection element is closely attached to the negative electrode of the battery.

[0077] The inventors of the present application have found that the temperature at the negative electrode position of the battery is closer to the actual surface temperature of the battery. The temperature change at the negative electrode position of the battery is the most sensitive and the feedback is the fastest. Therefore, the temperature detection element can be disposed at the negative electrode of the battery, and the surface temperature of the motor negative electrode is collected as the actual surface temperature of the battery.

[0078] In the embodiments of the present application, each component in the warning device is integrated on a control board, which can be a small control main board with data processing capabilities and program editing functions, and has a WIFI / Bluetooth module and a data line interface.

[0079] The control board can be fixedly installed as a whole at a position adjacent to the battery, and the probe of the temperature detection element can be closely attached to the negative electrode surface of the battery, so as to accurately detect the surface temperature of the negative electrode of the motor.

[0080] As an example, the control board can be arranged close to the battery, and the detection probe of the temperature detection element can be fixed on the negative electrode surface of the battery, so as to play a role in fixing the whole control board.

[0081] As an example, Figure 2 is a schematic diagram of the installation structure of the abnormal warning device provided by the embodiments of the present application.

[0082] In this example, the abnormal warning device can be integrated into a control board, which can be installed at a position adjacent to the battery to save the installation volume, so as to be suitable for installation and use in small electric vehicles.

[0083] Figure 2 2a and 2b in are schematic diagrams of the installation structure when the control board is arranged on two types of batteries.

[0084] As an example, Figure 3 is a schematic diagram of the circuit structure of the abnormal warning device provided by the embodiments of the present application.

[0085] As Figure 3 shown, when there are multiple batteries in the battery pack of an electric vehicle, an abnormal warning device can be set for each battery respectively, and the voltage detection element and the switch control element of the abnormal warning device are both connected to the power supply circuit of the battery. The wireless transmission module of the abnormal warning device can send warning information through wireless connection methods such as Bluetooth or WIFI.

[0086] As an example, Figure 4 is a schematic diagram of the structure of the warning device provided in the embodiments of the present application.

[0087] As Figure 4 shown, the control system, that is, the controller, is used to receive temperature signals and voltage signals to detect the abnormal state of the battery. When the battery is in an abnormal state, the controller can send a circuit disconnection signal to the relay to control the disconnection of the power supply circuit of the battery, and / or the controller can send a warning message to the user terminal. The user terminal can install a corresponding application program and display the warning message in the application program (i.e., APP alert).

[0088] In an alternative embodiment of the present application, the warning information sending module is any one of a signal display component, a wired connection module, or a wireless connection module. The wired connection module or the wireless connection module is used to establish a communication connection with the user terminal and send warning information.

[0089] The warning information sending module is a signal display component, and the flashing of the signal lamp is used as a warning signal to be displayed to the user.

[0090] The warning information sending module can also be used to send various forms of warning information to the user terminal, and this warning can be sent in the form of a wired connection or a wireless connection.

[0091] The user terminal may include, but is not limited to, an in-vehicle terminal, a personal mobile phone, a smart watch, a mobile computer, etc. The user terminal can establish communication with the battery anomaly warning device. The user terminal can deploy an anomaly warning APP, and this APP can have the following functions: First, visualization of voltage / temperature change curves. The user can see the temperature-time change curve and voltage-time change curve of the monitored battery on the user terminal, so as to know the working state of the battery; Second, a thermal runaway alarm function. When it is determined that the battery is in an abnormal state and there is a risk of thermal runaway, this APP can immediately give a warning to the user in the form of sound alarm, light alarm, etc.; Third, a driving scenario switching function. The user can switch between the driving scenario and the non-driving scenario through the APP, and the APP will also display the abnormal handling methods in the two scenarios to the user; Fourth, a manual power-off function. The APP can provide the user with a manual power-off function for the user to choose. When the battery is in an abnormal state, the user can send a power-off instruction to the controller through the APP to manually control the circuit to disconnect.

[0092] The embodiment of the present application also provides a schematic flow diagram of a battery anomaly warning method. As Figure 5 shown, this method mainly may include:

[0093] Step 510: Detect the operating parameters of the battery;

[0094] Step 520: Determine whether the change situation of the operating parameters meets the preset conditions;

[0095] Step 530: In response to the change situation of the operating parameters meeting the preset conditions, determine that the battery is in an abnormal state, and determine the abnormal handling method based on the current usage scenario. The abnormal handling method at least includes controlling the power supply circuit of the battery to disconnect, and sending warning information to the user terminal.

[0096] Among them, the operating parameters can reflect the operating state of the battery, and based on the operating parameters, it can be judged whether the battery is in an abnormal state.

[0097] In the embodiments of the present application, the preset conditions can be set according to experiments and / or experience. When the operating parameters meet the preset conditions, it can be determined that the battery is in an abnormal state, and when the operating parameters do not meet the preset conditions, it can be determined that the battery is in a normal state.

[0098] When it is determined that the battery is in an abnormal state, corresponding abnormal handling methods can be selected according to the current usage scenario to meet the requirements for abnormal handling in different scenarios.

[0099] The abnormal handling methods can include controlling the switch control element to disconnect the power supply circuit, so as to stop the power supply of the battery and avoid thermal runaway caused by continuous power supply in the abnormal state.

[0100] The abnormal handling methods can also include controlling the warning information sending module to send warning information to prompt the user that the battery is in an abnormal state and take measures in time.

[0101] The method provided by the embodiments of the present application determines the state of the battery by detecting the operating parameters of the battery, based on whether the operating parameters meet the preset conditions. In response to the battery being in an abnormal state, the abnormal handling method is determined based on the current usage scenario. The abnormal handling method at least includes controlling the power supply circuit of the battery to be disconnected and sending a warning message to the user terminal. Based on this solution, the abnormal state of the battery can be effectively monitored, and corresponding abnormal handling methods are used to achieve warning, improving the safety of the battery.

[0102] In an alternative embodiment of the present application, the current usage scenario includes a driving scenario and a non-driving scenario. Based on the abnormal state and the current usage scenario, determining the abnormal handling method includes:

[0103] In response to being in a non-driving scenario, control the power supply circuit of the battery to be disconnected;

[0104] In response to being in a driving scenario, send a warning message.

[0105] Among them, the current usage scenarios include a driving scenario and a non-driving scenario. The driving scenario means that the electric vehicle is in the driving process, and the non-driving scenario means that the vehicle is in a non-driving state, such as parking, charging, etc.

[0106] In the non-driving scenario, the vehicle is generally in a stationary state. At this time, when it is determined that the vehicle is in an abnormal state, the power supply circuit of the battery can be controlled to be disconnected, so as to stop the power supply of the battery and avoid thermal runaway caused by continuous power supply in the abnormal state.

[0107] It can be understood that in the non-driving scenario, after cutting off the power supply of the battery, a prompt message can also be sent to the user. For example, a prompt message is sent to the APP of the user terminal to prompt the user that the power supply of the battery has been cut off due to an abnormal state.

[0108] In non-driving scenarios, cutting off the power supply of the battery generally does not affect driving safety. However, in driving scenarios, sudden automatic switching of the battery power supply may endanger driving safety. Therefore, a warning message can be sent to the user. For example, a warning message can be sent to the APP on the user side to prompt the user to take corresponding measures. For example, the user can decelerate the electric vehicle and park it in a safe position before manually cutting off the power supply.

[0109] In an alternative embodiment of the present application, the operating parameters include the temperature of the battery and / or the voltage of the power supply circuit.

[0110] The preset conditions include:

[0111] The change rate of the operating parameter is not lower than a preset parameter change rate threshold.

[0112] Among them, the operating parameters include the temperature of the battery and / or the voltage of the power supply circuit.

[0113] In the battery state monitoring scheme, the voltage monitoring and temperature monitoring schemes have the lowest false alarm probability, the lowest cost, the highest applicability, and the longest service life. Therefore, they are suitable for long-term and stable monitoring of small vehicle lithium-ion batteries at low cost.

[0114] When there are certain abnormal conditions in the battery, for example, when the battery is continuously charged and discharged at a high rate or operates at a voltage higher than the rated voltage, the change rate of the total voltage of the power supply circuit will increase significantly, and the temperature rise rate of the battery will immediately increase significantly.

[0115] As an example, Figure 6 is a graph showing the change of the temperature on the negative electrode surface of the battery over time obtained from experimental tests at different discharge rates. Among them, the curve corresponding to the abnormal temperature rise node represents the temperature change rate threshold corresponding to different discharge rates.

[0116] Figure 7 is a graph showing the change of the voltage over time obtained from experimental tests at different discharge rates. Among them, the curve corresponding to the abnormal temperature rise node represents the temperature change rate threshold corresponding to different discharge rates.

[0117] Figure 8 is a graph showing the change of the temperature on the negative electrode surface of the battery over time obtained by simulation using COMSOL software at different discharge rates. Figure 9 is a graph showing the change of the voltage over time obtained by simulation using COMSOL software at different discharge rates.

[0118] Through experimental tests, when the battery is continuously charged and discharged at a rate not less than 4 times the rated rate, or continues to operate when the voltage exceeds the rated range, the rate of voltage change will increase significantly, and the rate of battery temperature rise will also immediately increase significantly. The subsequent voltage / temperature change curve simulated by COMSOL software corroborates this phenomenon, that is, when the state of charge (SOC) of the battery rises to a certain value, that is, when the charge and discharge process of the battery approaches the limit, the rate of temperature change and the rate of voltage change of the battery will increase significantly. When the abnormal temperature rise continues for a period of time, the electrolyte of the battery may vaporize, which may further cause the battery diaphragm to rupture, the battery to bulge, and pose a safety risk. According to multiple experiments, the voltage change rate threshold is determined to be 0.016 V / s, and the temperature change rate threshold is 1 °C / s.

[0119] In the embodiments of the present application, for different battery power supply circuits, the applicable parameter change rate thresholds may be different, which can support customizing the parameter change rate thresholds, and can also determine the parameter change rate thresholds according to the circuit parameters of the power supply circuit.

[0120] In an alternative embodiment of the present application, the above method further includes:

[0121] Obtain the circuit parameters of the power supply circuit;

[0122] Determine the corresponding parameter change rate threshold based on the circuit parameters.

[0123] In the embodiments of the present application, when the battery power supply circuit has different circuit parameters, the applicable parameter change thresholds are different. The corresponding relationship between the circuit parameters and the parameter change rate thresholds can be preset, and based on this corresponding relationship, the parameter change rate threshold corresponding to the circuit parameters can be determined.

[0124] In an alternative embodiment of the present application, the circuit parameters include the output power, and the output power is positively correlated with the corresponding parameter change rate threshold.

[0125] In the embodiments of the present application, the circuit parameters may specifically be the output power. When the output power is higher, the parameter change situation is more severe, and a higher parameter change rate threshold should be set. When the output power is lower, a lower parameter change rate threshold should be set.

[0126] As an alternative example, when it is monitored that the change rate of the battery voltage is not less than the voltage change rate threshold, or the change rate of the battery surface temperature is not less than the temperature change rate threshold, it is determined that the battery is in an abnormal state, which may be a precursor to a thermal runaway phenomenon. At this time, corresponding abnormal handling methods can be adopted based on the current usage scenario.

[0127] In addition, in some specific working conditions, the voltage or temperature of the battery may undergo sudden changes under normal circumstances, and it is necessary to avoid identifying these normal fluctuations as abnormal states. For example, during rapid acceleration or rapid deceleration, the change in current may cause a sudden change in voltage. Another example is that a sudden change in the ambient temperature, such as quickly driving from an underground garage to a road under the scorching sun, resulting in a sudden change in the external ambient temperature from low to high, may also trigger a sudden change in the battery temperature.

[0128] In the embodiment of the present application, the battery abnormality warning device can also obtain vehicle state parameters from the vehicle-mounted terminal in real time. The vehicle state parameters may include the depth of the accelerator pedal, the energy recovery intensity, the charging state (such as fast charging, slow charging), the ambient temperature, and the current vehicle speed, etc. The above vehicle state parameters can reflect the working conditions of the vehicle. Therefore, based on the vehicle state parameters, the corresponding temperature change rate threshold or voltage change rate threshold can be determined to adapt to different working conditions and avoid misjudging abnormal states.

[0129] For example, when the depth of the accelerator pedal is greater than a preset depth value, it can be determined that the vehicle is in a rapid acceleration working condition. At this time, a higher voltage change rate threshold needs to be adapted. Specifically, a corresponding relationship can be established between the depth of the accelerator pedal and the voltage change rate threshold, so that the depth of the accelerator pedal is positively correlated with the voltage change rate threshold, that is, the higher the depth of the accelerator pedal, the higher the corresponding voltage change rate threshold, and the lower the depth of the accelerator pedal, the lower the corresponding voltage change rate threshold.

[0130] In the embodiment of the present application, the parameter change rate threshold can be understood as the change amount of the parameter within a time window. Generally, it is the change amount of the temperature within 1 second. According to the above vehicle state parameters, the length of this time window can also be adjusted to judge abnormal states by measuring the parameter change situation at different time scales.

[0131] For example, when the ambient temperature undergoes a sudden change, it may induce a sudden change in the battery temperature, but this kind of sudden change is mostly instantaneous and will not continue to increase. Therefore, when it is detected that the change amount of the ambient temperature within a preset time duration exceeds a preset value, such as the change in the ambient temperature exceeds 11 °C within 10 seconds, it is determined that a sudden change in temperature has occurred. At this time, the duration of the time window corresponding to the temperature change rate threshold can be extended, such as from 1 second to 3 seconds. Correspondingly, the value of the temperature change rate threshold also changes from 1 °C to 3 °C, so as to obtain the change situation of the battery temperature within a longer time window and avoid misjudging the abnormal state of the battery when the battery temperature undergoes an instantaneous and non-continuous sudden change.

[0132] In an alternative embodiment of the present application, the above method further includes any one of the following:

[0133] Determine the current usage scenario based on the information of the usage scenario returned by the user terminal;

[0134] Determine the current usage scenario based on the operating parameters.

[0135] In the embodiments of the present application, the current usage scenario will affect the selection of subsequent exception handling methods, so it is necessary to accurately judge the current usage scenario.

[0136] As an example, the user can set the current usage scenario on the user side. The exception warning device provided by the embodiments of the present application can establish a communication connection with the user side and request the information of the usage scenario from the user side in real time, so as to determine the current usage scenario based on the information of the usage scenario returned by the user side.

[0137] As another example, the operating parameters of the battery can also reflect the current usage scenario, and the current usage scenario can be determined based on the operating parameters. For example, the voltage of the battery is different in the driving scenario and the non-driving scenario, and the driving scenario and the non-driving scenario can be determined based on the voltage.

[0138] The solution provided by the embodiments of the present application can be applied to the safety management of various small electric vehicles.

[0139] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

Claims

1. A battery anomaly warning device, characterized in that, The warning device is powered by the monitored battery, and the warning device includes: A battery parameter detector for detecting the operating parameters of the battery; A switch control element connected to the power supply circuit of the battery for controlling the on / off of the power supply circuit; A warning information sending module for sending warning information; A controller electrically connected to the battery parameter detector, the switch control element, and the warning information sending module respectively, for obtaining the operating parameters, determining whether the change of the operating parameters meets a preset condition, in response to the change of the operating parameters meeting the preset condition, determining that the battery is in an abnormal state, and determining an abnormal handling method based on the current usage scenario, the abnormal handling method at least includes controlling the switch control element to disconnect the power supply circuit, and controlling the warning information sending module to send warning information.

2. The device according to claim 1, characterized in that, The battery parameter detector includes at least one of the following: A temperature detection element; A voltage detection element; Wherein, the temperature detection element is arranged at at least one specified detection position of the battery for detecting the surface temperature of the battery; The voltage detection element is connected to the power supply circuit for detecting the voltage of the power supply circuit.

3. The device according to claim 2, characterized in that, The specified detection position includes the negative electrode position of the battery; Each component in the warning device is integrated on a control board, the control board is fixed at a position adjacent to the battery, and the detection probe of the temperature detection element is closely attached to the negative electrode of the battery.

4. The device according to any one of claims 1 to 3, characterized in that The warning information sending module is any one of a signal display component, a wired connection module or a wireless connection module, and the wired connection module or the wireless connection module is used to establish a communication connection with the user terminal and send the warning information.

5. A battery anomaly warning method, characterized in that, Including: Detecting the operating parameters of the battery; Determining whether the change of the operating parameters meets a preset condition; In response to the change of the operating parameters meeting the preset condition, determining that the battery is in an abnormal state, and determining an abnormal handling method based on the current usage scenario, the abnormal handling method at least includes controlling the power supply circuit of the battery to be disconnected, and sending a warning information to the user terminal.

6. The method according to claim 5, characterized in that The current usage scenario includes a driving scenario and a non-driving scenario, and determining the abnormal handling method based on the abnormal state and the current usage scenario includes: In response to being in a non-driving scenario, controlling the power supply circuit of the battery to be disconnected; In response to being in a driving scenario, sending warning information.

7. The method according to claim 5, wherein The operating parameters include the temperature of the battery and / or the voltage of the power supply circuit; The preset condition includes: The change rate of the operating parameters is not lower than a preset parameter change rate threshold.

8. The method according to claim 7, wherein The method further includes: Obtaining the circuit parameters of the power supply circuit; Determining a corresponding parameter change rate threshold based on the circuit parameters.

9. The method according to claim 8, wherein The circuit parameters include output power, and the output power is positively correlated with the corresponding parameter change rate threshold.

10. The method according to any one of claims 5 to 9, characterized in that The method further includes any one of the following: Determining the current usage scenario based on the information of the usage scenario returned by the user terminal; Determining the current usage scenario based on the operating parameters.

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