Battery management system function monitoring method and battery management system

Abstract

The invention provides a battery management system function monitoring method and a battery management system, and the method comprises the steps: for each battery information collection function, monitoring a battery information collection module corresponding to the battery information collection function through a function monitoring module corresponding to the battery information collection function, whether the battery information acquisition function is normal or not is judged; and when the battery information acquisition function is normal, executing the battery information acquisition function through the battery information acquisition module corresponding to the battery information acquisition function to obtain the battery state information corresponding to the acquired battery information acquisition function, so as to acquire the battery state information corresponding to the battery information acquisition function according to the battery state information acquired by the normal battery information acquisition function. And analyzing the battery state of the power battery. Through the method, the judgment accuracy of the state of the power battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy electric vehicles, and in particular to a method for monitoring the functions of a battery management system and a battery management system. Background Art

[0002] The battery management system in new energy electric vehicles is generally used to manage the power batteries in new energy electric vehicles, such as charge and discharge management of the power batteries, battery overvoltage and undervoltage detection, battery overcurrent and undercurrent detection, etc. When the battery management system manages the power battery, it generally collects the state parameters of the power battery, such as the power battery voltage parameters, current parameters, etc. Then, the current state of the power battery is judged based on the collected power battery state parameters.

[0003] In the prior art, when the collected state parameters are not within the standard range, it is generally considered that the state of the power battery is abnormal. For example, when the collected voltage is too low, the battery management system generally considers that the power battery is undervoltage. However, the collected state parameters are not necessarily the real state parameters of the power battery. For example, the collected battery voltage is not necessarily the real voltage of the power battery. It may also be caused by an abnormality in the voltage collection module itself in the battery management system.

[0004] Therefore, if the current state of the power battery is directly determined based on the collected state parameters, there may be a problem of inaccurate judgment of the power battery state. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a method for monitoring the functions of a battery management system and a battery management system, so as to improve the accuracy of the collected battery information, thereby improving the accuracy of the judgment of the power battery status.

[0006] In a first aspect, an embodiment of the present application provides a method for monitoring the function of a battery management system, which is applied to a battery management system in an electric vehicle; the battery management system includes a battery information collection module and a function monitoring module corresponding to each battery information collection function; the battery information collection module is used to execute the battery information collection function corresponding to the battery information collection module; the method includes:

[0007] For each of the battery information collection functions, the battery information collection module corresponding to the battery information collection function is monitored by the function monitoring module corresponding to the battery information collection function to determine whether the battery information collection function is normal;

[0008] When the battery information collection function is normal, the battery information collection function is executed by the battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

[0009] In combination with the first aspect, the embodiment of the present application provides a first possible implementation of the first aspect, wherein the method further includes:

[0010] When the battery information collection function is abnormal, the power battery is controlled to enter a preset safety state.

[0011] In combination with the first aspect, an embodiment of the present application provides a second possible implementation method of the first aspect, wherein the battery information collection function includes any one or more of the following functions: current collection function, single cell voltage collection function, total voltage collection function, battery module temperature collection function, cooling water inlet and outlet temperature collection function, circuit board temperature collection function, battery internal air pressure collection function, battery internal smoke concentration collection function, insulation resistance collection function, and collision signal collection function.

[0012] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a third possible implementation of the first aspect, wherein when the battery information collection function is the current collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0013] When the current acquisition function is normal, the current of the power battery is acquired through the current acquisition module corresponding to the current acquisition function, so as to perform overcurrent detection on the power battery according to the current.

[0014] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a fourth possible implementation of the first aspect, wherein, when the battery information collection function is any one of the single cell voltage collection function or the total voltage collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0015] When the voltage acquisition function is normal, the voltage of the power battery is acquired by the voltage acquisition module corresponding to the voltage acquisition function, so as to perform overvoltage and undervoltage detection on the power battery according to the voltage; the voltage is a single cell voltage or a total voltage.

[0016] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a fifth possible implementation of the first aspect, wherein, when the battery information collection function is any one of the battery module temperature collection function, the cooling water inlet and outlet temperature collection function, or the circuit board temperature collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0017] When the temperature acquisition function is normal, the corresponding temperature is acquired by the temperature acquisition module corresponding to the temperature acquisition function to perform over-temperature detection on the temperature or abnormality detection on the thermal management system; the temperature is the battery module temperature acquisition function, the cooling water inlet and outlet temperature acquisition function or the circuit board temperature.

[0018] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein, when the battery information collection function is any one of the battery internal air pressure collection function or the battery internal smoke concentration collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0019] When the gas collection function is normal, the corresponding gas information is collected by the gas collection module corresponding to the gas collection function, so as to perform harmful gas detection or thermal runaway detection according to the gas information; the gas information is the internal gas pressure of the battery or the internal smoke concentration of the battery.

[0020] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein, when the battery information collection function is the insulation resistance collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0021] When the insulation resistance acquisition function is normal, the insulation resistance of the positive electrode of the power battery to the ground and the negative electrode of the power battery to the ground are acquired by the insulation resistance acquisition module corresponding to the insulation resistance acquisition function to determine whether the insulation resistance is greater than a preset resistance; wherein, when the insulation resistance is greater than the preset resistance, it indicates that the body of the electric vehicle is charged.

[0022] In combination with the second possible implementation of the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein, when the battery information collection function is the collision signal collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including:

[0023] When the collision signal collection function is normal, the collision signal of the electric vehicle is collected by the collision signal collection module corresponding to the collision signal collection function, so as to perform vehicle collision detection according to the collision signal.

[0024] In a second aspect, an embodiment of the present application further provides a battery management system, wherein the battery management system in an electric vehicle comprises a battery information collection module and a function monitoring module corresponding to each battery information collection function; the battery information collection module is used to execute the battery information collection function corresponding to the battery information collection module;

[0025] For each of the battery information collection functions, a function monitoring module corresponding to the battery information collection function is used to monitor the battery information collection module corresponding to the battery information collection function to determine whether the battery information collection function is normal;

[0026] The battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function;

[0027] The battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

[0028] In combination with the second aspect, an embodiment of the present application provides a first possible implementation of the second aspect, wherein the battery management system is also used to control the power battery to enter a preset safety state when the battery information collection function is abnormal.

[0029] In combination with the second aspect, an embodiment of the present application provides a second possible implementation method of the second aspect, wherein the battery information collection function includes any one or more of the following functions: current collection function, single cell voltage collection function, total voltage collection function, battery module temperature collection function, cooling water inlet and outlet temperature collection function, circuit board temperature collection function, battery internal air pressure collection function, battery internal smoke concentration collection function, insulation resistance collection function, and collision signal collection function.

[0030] In combination with the second possible implementation of the second aspect, the embodiment of the present application provides a third possible implementation of the second aspect, wherein, when the battery information collection function is the current collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0031] When the current collection function is normal, the current of the power battery is collected by a current collection module corresponding to the current collection function;

[0032] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0033] An overcurrent detection is performed on the power battery according to the current.

[0034] In combination with the second possible implementation of the second aspect, the embodiment of the present application provides a fourth possible implementation of the second aspect, wherein, when the battery information collection function is any one of the single cell voltage collection function or the total voltage collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0035] When the voltage acquisition function is normal, the voltage of the power battery is acquired through the voltage acquisition module corresponding to the voltage acquisition function; the voltage is a single cell voltage or a total voltage;

[0036] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0037] The power battery is subjected to overvoltage and undervoltage detection according to the voltage.

[0038] In combination with the second possible implementation of the second aspect, the embodiment of the present application provides a fifth possible implementation of the second aspect, wherein, when the battery information collection function is any one of the battery module temperature collection function, the cooling water inlet and outlet temperature collection function, or the circuit board temperature collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0039] When the temperature acquisition function is normal, the corresponding temperature is acquired by the temperature acquisition module corresponding to the temperature acquisition function; the temperature is the battery module temperature acquisition function, the cooling water inlet and outlet temperature acquisition function or the circuit board temperature;

[0040] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0041] An over-temperature detection is performed on the temperature or an abnormality detection is performed on the thermal management system.

[0042] In combination with the second possible implementation manner of the second aspect, the embodiment of the present application provides a sixth possible implementation manner of the second aspect, wherein, when the battery information collection function is any one of the battery internal air pressure collection function or the battery internal smoke concentration collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0043] When the gas collection function is normal, the corresponding gas information is collected by the gas collection module corresponding to the gas collection function; the gas information is the gas pressure inside the battery or the smoke concentration inside the battery;

[0044] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0045] Harmful gas detection or thermal runaway detection is performed based on the gas information.

[0046] In combination with the second possible implementation of the second aspect, the embodiment of the present application provides a seventh possible implementation of the second aspect, wherein, when the battery information collection function is the insulation resistance collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0047] When the insulation resistance acquisition function is normal, the insulation resistance values ​​of the positive electrode of the power battery to the ground and the negative electrode of the power battery to the ground are acquired through the insulation resistance acquisition module corresponding to the insulation resistance acquisition function;

[0048] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0049] Determine whether the insulation resistance is greater than a preset resistance; wherein, when the insulation resistance is greater than the preset resistance, it indicates that the body of the electric vehicle is charged.

[0050] In combination with the second possible implementation of the second aspect, the embodiment of the present application provides an eighth possible implementation of the second aspect, wherein, when the battery information collection function is the collision signal collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0051] When the collision signal collection function is normal, the collision signal of the electric vehicle is collected by a collision signal collection module corresponding to the collision signal collection function;

[0052] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0053] Vehicle collision detection is performed according to the collision signal.

[0054] The embodiment of the present application provides a method for monitoring the function of a battery management system and a battery management system, wherein, before collecting the battery status information corresponding to each battery information collection function, the battery information collection module corresponding to the battery information collection function is first monitored by the monitoring module corresponding to each battery information collection function to determine whether the battery information collection function is normal. Only when the battery information collection function is normal, the battery information collection function is executed by the battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function. In this way, the obtained battery status information can be the actual status information of the battery, eliminating the influence of the abnormal battery information collection function, ensuring the accuracy of the collected battery status information, and thus facilitating the accuracy of the power battery status judgment.

[0055] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 A flow chart showing a method for monitoring a battery management system function provided in an embodiment of the present application is shown;

[0058] Figure 2 A schematic diagram showing the relationship between an electric vehicle and a battery management system provided in an embodiment of the present application is shown;

[0059] Figure 3 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application is shown;

[0060] Figure 4 A flow chart of another method for monitoring functions of a battery management system provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0061] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0062] Considering that when the battery information collection function itself is abnormal, if the collected battery status information is used to analyze the battery status of the power battery, the accuracy of the analysis result will be affected. Based on this, the embodiment of the present application provides a method for monitoring the function of a battery management system and a battery management system, which are described below through embodiments.

[0063] To facilitate understanding of this embodiment, a method for monitoring the function of a battery management system disclosed in the embodiment of this application is first described in detail. The method is applied to a battery management system in an electric vehicle; the battery management system includes a battery information collection module and a function monitoring module corresponding to each battery information collection function; the battery information collection module is used to execute the battery information collection function corresponding to the battery information collection module; Figure 1 As shown, the following steps are included:

[0064] S101: For each battery information collection function, the battery information collection module corresponding to the battery information collection function is monitored by the function monitoring module corresponding to the battery information collection function to determine whether the battery information collection function is normal.

[0065] In this embodiment, if Figure 2 As shown, the battery management system is located in an electric vehicle.

[0066] In one possible implementation, the battery information collection function includes any one or more of the following functions: current collection function, single cell voltage collection function, total voltage collection function, battery module temperature collection function, cooling water inlet and outlet temperature collection function, circuit board temperature collection function, battery internal air pressure collection function, battery internal smoke concentration collection function, insulation resistance collection function, and collision signal collection function.

[0067] like Figure 3 As shown, each battery information collection function corresponds to a battery information collection module and a function monitoring module.

[0068] Among them, the battery information acquisition module corresponding to the current acquisition function is the current acquisition module, and the corresponding function monitoring module is the current acquisition function monitoring module. In this embodiment, the current acquisition module includes two current sensors with different principles and different transmission paths, and the two current sensors respectively collect the current of the power battery. The current acquisition function monitoring module determines whether the difference between the currents collected by the two current sensors is within the allowable range. If so, it means that the current acquisition function is normal, and if not, it means that the current acquisition function is abnormal.

[0069] The battery information collection module corresponding to the single cell voltage collection function is the single cell voltage collection module, which is used to collect the voltage of all single cells of the power battery. The single cell voltage collection function monitoring module is used to monitor the single cell voltage collection module to determine whether the single cell voltage collection function is normal.

[0070] The battery information acquisition module corresponding to the total voltage acquisition function is the total voltage acquisition module, which is used to collect the total voltage of the power battery and the front and rear voltages of each contactor in the power battery. The total voltage acquisition function monitoring module is used to monitor the total voltage acquisition module to determine whether the total voltage acquisition function is normal.

[0071] The battery module temperature acquisition module corresponding to the battery module temperature acquisition function is used to collect the module temperature of the power battery. The battery module temperature acquisition function monitoring module is used to monitor the battery module temperature acquisition module to determine whether the battery module temperature acquisition function is normal.

[0072] The cooling water inlet and outlet temperature collection module corresponding to the cooling water inlet and outlet temperature collection function is used to collect the inlet and outlet temperatures of the cooling water of the power battery. The cooling water inlet and outlet temperature collection function monitoring module is used to monitor the cooling water inlet and outlet temperature collection module to determine whether the cooling water inlet and outlet temperature collection function is normal.

[0073] The circuit board temperature acquisition module corresponding to the circuit board temperature acquisition function is used to collect the temperature of the circuit board in the battery management system. The circuit board temperature acquisition function monitoring module is used to monitor the circuit board temperature acquisition module to determine whether the circuit board temperature acquisition function is normal.

[0074] The battery internal air pressure collection module corresponding to the battery internal air pressure collection function is used to collect the air pressure inside the power battery. The battery internal air pressure collection function monitoring module is used to monitor the battery internal air pressure collection module to determine whether the battery internal air pressure collection function is normal.

[0075] The battery internal smoke concentration collection module corresponding to the battery internal smoke concentration collection function is used to collect the gas concentration inside the power battery. The battery internal smoke concentration collection function monitoring module is used to monitor the battery internal smoke concentration collection module to determine whether the battery internal smoke concentration collection function is normal.

[0076] The insulation resistance acquisition module corresponding to the insulation resistance acquisition function is used to collect the insulation resistance between the positive electrode and the ground and the negative electrode and the ground of the power battery. The insulation resistance acquisition function monitoring module is used to monitor the insulation resistance acquisition module to determine whether the insulation resistance acquisition function is normal.

[0077] The collision signal acquisition module corresponding to the collision signal acquisition function includes two collision signal acquisition methods with different principles and different transmission paths. Two collision signals are collected through these two different collision signal acquisition methods. The collision signal acquisition function monitoring module determines whether the difference between the two collision signals is within the allowable range. If it is within the allowable range, it means that the collision signal acquisition function is normal. If not, it means that the collision signal acquisition function is abnormal.

[0078] S102: When the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

[0079] In a possible implementation manner, when the battery information collection function is the current collection function, when the battery information collection function is normal, when executing step S102, the following steps may be specifically performed:

[0080] When the current acquisition function is normal, the current of the power battery is acquired through the current acquisition module corresponding to the current acquisition function, so as to perform overcurrent detection on the power battery according to the current.

[0081] In a possible implementation manner, when the battery information collection function is any one of the single cell voltage collection function and the total voltage collection function, when executing step S102, the following steps may be specifically performed:

[0082] When the voltage acquisition function is normal, the voltage of the power battery is collected by the voltage acquisition module corresponding to the voltage acquisition function to perform overvoltage and undervoltage detection on the power battery according to the voltage; the pressure is the single cell voltage or the total voltage.

[0083] In a possible implementation, when the battery information collection function is any one of the battery module temperature collection function, the cooling water inlet and outlet temperature collection function, or the circuit board temperature collection function, when executing step S102, the following steps may be specifically performed:

[0084] When the temperature acquisition function is normal, the corresponding temperature is collected by the temperature acquisition module corresponding to the temperature acquisition function to detect over-temperature or abnormality of the thermal management system; the temperature is the battery module temperature acquisition function, the cooling water inlet and outlet temperature acquisition function or the circuit board temperature.

[0085] In a possible implementation manner, when the battery information collection function is any one of the battery internal air pressure collection function and the battery internal smoke concentration collection function, when executing step S102, the following steps may be specifically performed:

[0086] When the gas collection function is normal, the corresponding gas information is collected by the gas collection module corresponding to the gas collection function, so as to perform harmful gas detection or thermal runaway detection according to the gas information; the gas information is the internal gas pressure of the battery or the internal smoke concentration of the battery.

[0087] In a possible implementation manner, when the battery information collection function is an insulation resistance collection function, when executing step S102, the following steps may be specifically performed:

[0088] When the insulation resistance collection function is normal, the insulation resistance between the positive electrode of the power battery and the ground and the negative electrode of the power battery and the ground is collected by the insulation resistance collection module corresponding to the insulation resistance collection function to determine whether the insulation resistance is greater than the preset resistance; wherein, when the insulation resistance is greater than the preset resistance, it indicates that the body of the electric vehicle is charged.

[0089] In a possible implementation manner, when the battery information collection function is a collision signal collection function, when executing step S102, the following steps may be specifically performed:

[0090] When the collision signal collection function is normal, the collision signal of the electric vehicle is collected by the collision signal collection module corresponding to the collision signal collection function, so as to perform vehicle collision detection according to the collision signal.

[0091] In a possible implementation, Figure 4 As shown, after executing step S101, the following steps may also be performed:

[0092] S103: When the battery information collection function is abnormal, the power battery is controlled to enter a preset safety state.

[0093] The preset safety state may refer to a state in which all contactors in the power battery are disconnected so that the power battery stops contacting other loads.

[0094] Based on the same technical concept, the embodiment of the present application also provides a battery management system, wherein the battery management system in the electric vehicle comprises a battery information collection module and a function monitoring module corresponding to each battery information collection function; the battery information collection module is used to execute the battery information collection function corresponding to the battery information collection module;

[0095] For each of the battery information collection functions, a function monitoring module corresponding to the battery information collection function is used to monitor the battery information collection module corresponding to the battery information collection function to determine whether the battery information collection function is normal;

[0096] The battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function;

[0097] The battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

[0098] Optionally, the battery management system is also used to control the power battery to enter a preset safety state when the battery information collection function is abnormal.

[0099] Optionally, the battery information collection function includes any one or more of the following functions: current collection function, single cell voltage collection function, total voltage collection function, battery module temperature collection function, cooling water inlet and outlet temperature collection function, circuit board temperature collection function, battery internal air pressure collection function, battery internal smoke concentration collection function, insulation resistance collection function, and collision signal collection function.

[0100] Optionally, when the battery information collection function is the current collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0101] When the current collection function is normal, the current of the power battery is collected by a current collection module corresponding to the current collection function;

[0102] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0103] An overcurrent detection is performed on the power battery according to the current.

[0104] Optionally, when the battery information collection function is any one of the single cell voltage collection function or the total voltage collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0105] When the voltage acquisition function is normal, the voltage of the power battery is acquired through the voltage acquisition module corresponding to the voltage acquisition function; the voltage is a single cell voltage or a total voltage;

[0106] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0107] The power battery is subjected to overvoltage and undervoltage detection according to the voltage.

[0108] Optionally, when the battery information collection function is any one of the battery module temperature collection function, the cooling water inlet and outlet temperature collection function, or the circuit board temperature collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0109] When the temperature acquisition function is normal, the corresponding temperature is acquired by the temperature acquisition module corresponding to the temperature acquisition function; the temperature is the battery module temperature acquisition function, the cooling water inlet and outlet temperature acquisition function or the circuit board temperature;

[0110] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0111] An over-temperature detection is performed on the temperature or an abnormality detection is performed on the thermal management system.

[0112] Optionally, when the battery information collection function is any one of the battery internal air pressure collection function and the battery internal smoke concentration collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0113] When the gas collection function is normal, the corresponding gas information is collected by the gas collection module corresponding to the gas collection function; the gas information is the gas pressure inside the battery or the smoke concentration inside the battery;

[0114] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0115] Harmful gas detection or thermal runaway detection is performed based on the gas information.

[0116] Optionally, when the battery information collection function is the insulation resistance collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0117] When the insulation resistance acquisition function is normal, the insulation resistance values ​​of the positive electrode of the power battery to the ground and the negative electrode of the power battery to the ground are acquired through the insulation resistance acquisition module corresponding to the insulation resistance acquisition function;

[0118] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0119] Determine whether the insulation resistance is greater than a preset resistance; wherein, when the insulation resistance is greater than the preset resistance, it indicates that the body of the electric vehicle is charged.

[0120] Optionally, when the battery information collection function is the collision signal collection function, the battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function, specifically for:

[0121] When the collision signal collection function is normal, the collision signal of the electric vehicle is collected by a collision signal collection module corresponding to the collision signal collection function;

[0122] When the battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, it is specifically used to:

[0123] Vehicle collision detection is performed according to the collision signal.

[0124] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0125] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0126] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0127] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0128] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0129] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for monitoring the function of a battery management system, characterized in that: The method is applied to a battery management system in an electric vehicle; the battery management system comprises a battery information collection module and a function monitoring module corresponding to each battery information collection function; The battery information acquisition module is used to perform the battery information acquisition function corresponding to the battery information acquisition module; the method includes: For each of the battery information collection functions, the battery information collection module corresponding to the battery information collection function is monitored by the function monitoring module corresponding to the battery information collection function to determine whether the battery information collection function is normal; When the battery information collection function is normal, the battery information collection function is executed by the battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

2. The method according to claim 1, characterized in that: The method further comprises: When the battery information collection function is abnormal, the power battery is controlled to enter a preset safety state.

3. The method according to claim 1, characterized in that: The battery information collection function includes any one or more of the following functions: current collection function, single cell voltage collection function, total voltage collection function, battery module temperature collection function, cooling water inlet and outlet temperature collection function, circuit board temperature collection function, battery internal air pressure collection function, battery internal smoke concentration collection function, insulation resistance collection function, and collision signal collection function.

4. The method according to claim 3, characterized in that: When the battery information collection function is the current collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the current acquisition function is normal, the current of the power battery is acquired through the current acquisition module corresponding to the current acquisition function, so as to perform overcurrent detection on the power battery according to the current.

5. The method according to claim 3, characterized in that: When the battery information collection function is any one of the single cell voltage collection function and the total voltage collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the voltage acquisition function is normal, the voltage of the power battery is acquired by the voltage acquisition module corresponding to the voltage acquisition function, so as to perform overvoltage and undervoltage detection on the power battery according to the voltage; the voltage is a single cell voltage or a total voltage.

6. The method according to claim 3, characterized in that: When the battery information collection function is any one of the battery module temperature collection function, the cooling water inlet and outlet temperature collection function, or the circuit board temperature collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the temperature acquisition function is normal, the corresponding temperature is acquired by the temperature acquisition module corresponding to the temperature acquisition function to perform over-temperature detection on the temperature or abnormality detection on the thermal management system; the temperature is the battery module temperature acquisition function, the cooling water inlet and outlet temperature acquisition function or the circuit board temperature.

7. The method according to claim 3, characterized in that: When the battery information collection function is any one of the battery internal air pressure collection function and the battery internal smoke concentration collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the gas collection function is normal, the corresponding gas information is collected by the gas collection module corresponding to the gas collection function, so as to perform harmful gas detection or thermal runaway detection according to the gas information; the gas information is the internal gas pressure of the battery or the internal smoke concentration of the battery.

8. The method according to claim 3, characterized in that: When the battery information collection function is the insulation resistance collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the insulation resistance acquisition function is normal, the insulation resistance of the positive electrode of the power battery to the ground and the negative electrode of the power battery to the ground are acquired by the insulation resistance acquisition module corresponding to the insulation resistance acquisition function to determine whether the insulation resistance is greater than a preset resistance; wherein, when the insulation resistance is greater than the preset resistance, it indicates that the body of the electric vehicle is charged.

9. The method according to claim 3, characterized in that: When the battery information collection function is the collision signal collection function, when the battery information collection function is normal, the battery information collection function is executed by a battery information collection module corresponding to the battery information collection function to obtain the battery status information corresponding to the battery information collection function, so as to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function, including: When the collision signal collection function is normal, the collision signal of the electric vehicle is collected by the collision signal collection module corresponding to the collision signal collection function, so as to perform vehicle collision detection according to the collision signal.

10. A battery management system, characterized in that: The battery management system in the electric vehicle includes a battery information collection module and a function monitoring module corresponding to each battery information collection function; the battery information collection module is used to execute the battery information collection function corresponding to the battery information collection module; For each of the battery information collection functions, a function monitoring module corresponding to the battery information collection function is used to monitor the battery information collection module corresponding to the battery information collection function to determine whether the battery information collection function is normal; The battery information collection module corresponding to the battery information collection function is used to execute the battery information collection function when the battery information collection function is normal, and obtain the battery status information corresponding to the battery information collection function; The battery management system is used to analyze the battery status of the power battery according to the battery status information collected by the normal battery information collection function.

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