CN112557930A - Battery pack insulation performance monitoring method and device and vehicle - Google Patents
Battery pack insulation performance monitoring method and device and vehicle Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The method starts to receive message data sent by a BMS (battery management system) in the vehicle from the power-on of the vehicle, wherein the message data comprises charging state information and insulation resistance of a battery pack; determining target message data from the received message data according to the charging state information; counting a first quantity corresponding to target message data; under the condition that the first quantity is larger than or equal to a preset quantity threshold value, according to the insulation resistance value in each target message data, determining a second quantity of specified message data from the first quantity of target message data, wherein the specified message data are message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value; the insulation performance of the battery pack is determined according to the second number. The insulating properties of the battery pack can be determined according to the second quantity, and the insulating properties of the battery pack can be timely and accurately monitored, so that the safety performance of a vehicle can be effectively improved.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a battery pack insulation performance monitoring method and device and a vehicle.
Background
With the development of science and technology and the improvement of living standard, vehicles become essential tools for people to go out, electric vehicles become the current mainstream with the advantages of energy conservation, environmental protection, low use cost and the like, and the safety problem of electric vehicles is deeply concerned by vast vehicle users.
The battery pack in the electric vehicle is used as a power source of the vehicle, the performance of the battery pack influences the overall performance of the vehicle, the insulation performance of the battery pack directly influences the safety performance of the electric vehicle, and insulation faults of the battery pack not only can cause abnormal work of other electrical appliances of the vehicle, but also easily cause safety accidents such as fire disasters and electric shocks. Therefore, the insulating property of the battery pack can be timely and accurately known, so that the insulating fault of the battery pack can be timely avoided, and the dangerous situation caused by the insulating fault of the battery pack can be effectively avoided. However, in the related art, there is no method capable of timely and accurately monitoring the insulation performance of the battery pack, so that the generation of faults of the battery pack cannot be effectively avoided, which is not beneficial to improving the safety performance of the vehicle.
Disclosure of Invention
The invention aims to provide a battery pack insulation performance monitoring method and device and a vehicle.
In order to achieve the above object, a first aspect of the present disclosure provides a battery pack insulation performance monitoring method, including:
receiving message data sent by a Battery Management System (BMS) in a vehicle from the beginning of the vehicle power-on, wherein the message data comprises charging state information and insulation resistance values of a Battery pack;
determining target message data from the received message data according to the charging state information;
counting a first quantity corresponding to the target message data;
under the condition that the first quantity is determined to be larger than or equal to a preset quantity threshold value, determining a second quantity of specified message data from the first quantity of target message data according to the insulation resistance value in each target message data, wherein the specified message data are message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value;
and determining the insulation performance of the battery pack according to the second number.
Optionally, the determining, according to the charging state information, target packet data from the received packet data includes:
and determining the message data with the charging state information being in a non-quick charging state as the target message data.
Optionally, before the determining that the packet data whose charging state information is in the non-fast charging state is the target packet data, the method further includes:
acquiring a first frequency of the BMS for acquiring the insulation resistance;
acquiring a second frequency of the BMS for sending the message data;
and under the condition that the first frequency is smaller than the second frequency, determining repeated message data from the message data according to the first frequency and the second frequency, and deleting the repeated message data to obtain the remaining message data to be used.
Optionally, the determining the insulation performance of the battery pack according to the second number includes:
obtaining a target ratio of the second quantity to the first quantity;
and under the condition that the target ratio is determined to be greater than or equal to a preset ratio threshold, determining the insulation performance of the battery pack to be low-grade insulation.
Optionally, the method further comprises:
and under the condition that the insulation performance of the battery pack is determined to be low-grade insulation, outputting early warning prompt information, wherein the early warning prompt information is used for prompting that the current insulation performance of the battery pack is low-grade insulation.
In a second aspect of the present disclosure, there is provided a battery pack insulation performance monitoring device, the device comprising:
the receiving module is used for receiving message data sent by a BMS in the vehicle from the beginning of the electrification of the vehicle, and the message data comprises the charging state information and the insulation resistance value of the battery pack;
the first determining module is used for determining target message data from the received message data according to the charging state information;
the second determining module is used for counting a first quantity corresponding to the target message data;
a third determining module, configured to determine, when it is determined that the first number is greater than or equal to a preset number threshold, a second number of designated packet data from the first number of target packet data according to the insulation resistance value in each target packet data, where the designated packet data is a packet data whose insulation resistance value is less than or equal to a preset resistance value threshold;
and the fourth determining module is used for determining the insulation performance of the battery pack according to the second quantity.
Optionally, the charging state information includes a fast charging state and a non-fast charging state, and the first determining module is configured to:
and determining the message data with the charging state information being in a non-quick charging state as the target message data.
Optionally, the first determining module is configured to:
acquiring a first frequency of the BMS for acquiring the insulation resistance;
acquiring a second frequency of the BMS for sending the message data;
and under the condition that the first frequency is smaller than the second frequency, determining repeated message data from the message data according to the first frequency and the second frequency, and deleting the repeated message data to obtain the remaining message data to be used.
Optionally, the fourth determining module is configured to:
obtaining a target ratio of the second quantity to the first quantity;
and under the condition that the target ratio is determined to be greater than or equal to a preset ratio threshold, determining the insulation performance of the battery pack to be low-grade insulation.
Optionally, the apparatus further comprises:
and the prompting module is used for outputting early warning prompting information under the condition that the insulation performance of the battery pack is determined to be low-grade insulation, wherein the early warning prompting information is used for prompting that the current insulation performance of the battery pack is low-grade insulation.
A third aspect of the present disclosure provides a vehicle including the battery pack insulation performance monitoring apparatus described in the above second aspect.
According to the technical scheme, message data sent by a BMS in the vehicle are received from the power-on of the vehicle, wherein the message data comprise the charging state information and the insulation resistance value of a battery pack; determining target message data from the received message data according to the charging state information; counting a first quantity corresponding to the target message data; under the condition that the first quantity is determined to be larger than or equal to a preset quantity threshold value, determining a second quantity of specified message data from the first quantity of target message data according to the insulation resistance value in each target message data, wherein the specified message data are message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value; and determining the insulation performance of the battery pack according to the second number. Therefore, the insulation performance of the battery pack can be determined according to the number corresponding to the message data with the insulation resistance value smaller than or equal to the preset resistance value threshold, the insulation performance of the battery pack can be timely and accurately monitored, the battery pack with lower insulation performance can be timely processed before the insulation fault of the battery pack, unsafe accidents caused by the insulation fault of the battery pack can be effectively avoided, and the safety performance of a vehicle is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flow chart illustrating a method of monitoring insulation performance of a battery pack according to an exemplary embodiment of the present disclosure;
fig. 2 is a block diagram illustrating a battery pack insulation performance monitoring apparatus according to another exemplary embodiment of the present disclosure;
fig. 3 is a block diagram illustrating a battery pack insulation performance monitoring apparatus according to the embodiment shown in fig. 2 of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing the specific embodiments of the present disclosure in detail, the following description is first made on an application scenario of the present disclosure, and the present disclosure may be applied to a pure electric vehicle or a hybrid electric vehicle, and is used for monitoring the insulation performance of a battery pack in the vehicle, so that a battery pack with poor insulation performance can be found before a battery pack fault occurs, which is beneficial to avoiding the battery pack fault, and thus avoiding an unsafe accident caused by the battery pack fault. It is statistically found that the causes of the failure of the battery pack in the general vehicle include, in addition to the design and manufacturing problems, thermal aging, photo aging, material embrittlement in a low temperature environment, frictional damage caused by improper fixation, and the like. However, in the related art, there is no method capable of timely and accurately monitoring the insulation performance of the battery pack, so that the insulation performance of the battery pack cannot be timely and accurately known, and the generation of insulation faults of the battery pack cannot be effectively avoided, so that dangerous situations caused by the insulation faults of the battery pack cannot be effectively avoided, and the improvement of the safety performance of a vehicle is not facilitated.
In order to solve the technical problem, the present disclosure provides a battery pack insulation performance monitoring method, device and vehicle, the method starts receiving message data sent by a BMS in the vehicle from the vehicle power-on, wherein the message data includes charge state information and insulation resistance of a battery pack; determining target message data from the received message data according to the charging state information; counting a first quantity corresponding to the target message data; under the condition that the first quantity is determined to be larger than or equal to a preset quantity threshold value, determining a second quantity of specified message data from the first quantity of target message data according to the insulation resistance value in each target message data, wherein the specified message data are message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value; the insulation performance of the battery pack is determined according to the second number. Therefore, the insulation performance of the battery pack can be determined according to the number corresponding to the message data with the insulation resistance value smaller than or equal to the preset resistance value threshold, the insulation performance of the battery pack can be timely and accurately monitored, the battery pack with lower insulation performance can be timely processed before the insulation fault of the battery pack, unsafe accidents caused by the insulation fault of the battery pack can be effectively avoided, and the safety performance of a vehicle is improved.
Fig. 1 is a flow chart illustrating a method of monitoring insulation performance of a battery pack according to an exemplary embodiment of the present disclosure; referring to fig. 1, the method may include the steps of:
and step 101, receiving message data sent by a BMS in the vehicle from the power-on of the vehicle.
The message data comprises charging state information and insulation resistance value of the battery pack.
It should be noted that the method can be applied to a monitoring device in a battery pack insulation performance monitoring system, where the monitoring device may be a terminal device, such as a monitoring module installed in a BMS, a vehicle-mounted computer, a mobile phone, an Ipad, or the like, or a server, and the BMS in the vehicle acquires battery parameters in the battery pack and sends the acquired battery parameters to the monitoring device in the form of messages, so that the monitoring device performs statistics and analysis on the battery parameters. For example, when the monitoring device is a cloud server, the BMS may send the collected battery parameters to the cloud server in a form of a message in real time, and the cloud server stores the message data after receiving the message data, performs insulation monitoring on the battery corresponding to the BMS, and sends the detection result to a front end (e.g., multimedia in a vehicle) for presentation. When this detection device is this terminal equipment, this BMS can report this battery parameter to the cloud ware in real time, and this cloud server can be stored this message data after receiving this message data, and this monitoring devices can pull the message data that needs from this cloud ware (specifically say from the database of deployment in the cloud ware) and carry out insulating monitoring, then show the show to this monitoring result, can inform the user through notice modes such as nail, SMS, mail simultaneously. The battery parameters may include total voltage, total current, cell voltage, battery SOC (State of charge), insulation resistance, maximum voltage, minimum voltage, cell temperature, charging State information, and the like, where the charging State information may include a fast charging State and a non-fast charging State.
In addition, it should be noted that the BMS sends the message data to the monitoring device from the time when the vehicle is powered on, stops sending the message data to the monitoring device when the vehicle is powered off, and clears the number corresponding to the message data.
In this step, one possible implementation manner is: and determining the message data with the charging state information being in a non-quick charging state as the target message data.
It should be noted that before determining the message data with the charging state information being in the non-fast charging state as the target message data, data cleaning needs to be performed on the message data first, that is, the message data with a large error and the repeated message data are eliminated, where an implementation manner of determining the data with a large error is common in the prior art, and this disclosure may refer to a manner of eliminating error data in the prior art, and this disclosure is not repeated herein.
In addition, one possible implementation manner of eliminating duplicate message data may include the following steps:
and S1, acquiring the first frequency of the BMS for acquiring the insulation resistance.
And S2, acquiring a second frequency of the BMS for sending the message data.
S3, determining duplicate message data from the message data according to the first frequency and the second frequency and deleting the duplicate message data to obtain the remaining message data to be used when the first frequency is less than the second frequency.
Illustratively, the BMS acquires the insulation resistance value 15 times per minute, that is, acquires the insulation resistance value once every 4 seconds, and the BMS sends 30 pieces of the message data every minute, that is, sends the message data every 2 seconds, and then the insulation resistance value in the 1 st message data and the insulation resistance value in the 2 nd message data in the 30 pieces of message data are the same acquisition result, at this time, one of the 1 st message data and the 2 nd message data should be selected to be reserved, the 1 st message data (or the 2 nd message data) may be reserved, and the 2 nd message data (or the 1 st message data) is deleted. Therefore, the reliability of the message data can be effectively ensured, and the accuracy of the battery pack insulation performance monitoring result is favorably improved.
In this step, one possible implementation manner is: setting a counter in the vehicle or in the monitoring device, determining whether the message data received after the vehicle is powered on this time is the target message data according to the method described in step 102, adding one to the count value of the counter every time a target message data is determined, so as to update the count value of the counter to obtain the first number, and clearing the count value when the vehicle is determined to be powered off, wherein the counter may be a hardware counting device or a software counting program.
And 104, determining a second quantity of the appointed message data from the first quantity of the target message data according to the insulation resistance value in each target message data under the condition that the first quantity is larger than or equal to a preset quantity threshold value.
The designated message data is the message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value.
And step 105, determining the insulation performance of the battery pack according to the second quantity.
In this step, one possible implementation includes: obtaining a target ratio of the second quantity to the first quantity; determining the insulation performance of the battery pack to be low-grade insulation under the condition that the target ratio is determined to be greater than or equal to a preset ratio threshold; and under the condition that the target ratio is determined to be smaller than the preset ratio threshold, determining the insulation performance of the battery pack to be high-grade insulation.
Another possible implementation in this step includes: determining whether the second number is greater than or equal to a target number threshold, and in the case where it is determined that the second number is greater than or equal to the target number threshold, determining that the insulation performance of the battery pack is low-grade insulation; in a case where it is determined that the second number is less than the target number threshold, it is determined that the insulation performance of the battery pack is high-grade insulation.
It should be noted that the specific values of the preset number threshold, the preset resistance threshold, the preset ratio threshold, and the target number threshold can be obtained through experiments according to the model of the vehicle and the specific parameters of the vehicle battery.
For example, if the preset number threshold is N, the preset resistance threshold is R, and the preset ratio threshold is F, when the first number corresponding to the target packet data is equal to N, the second number N1 of the designated packet data with the insulation resistance value less than or equal to R in the N entry target packet data is obtained, so as to obtain the ratio of N1 to N (i.e., the target ratio), when the ratio of N1 to N is greater than or equal to the preset ratio threshold F, the insulation performance of the battery pack is determined to be low-level insulation, and when the ratio of N1 to N is less than the preset ratio threshold, the insulation performance of the battery pack is determined to be high-level insulation.
Optionally, after the step 105, the method may further include:
and under the condition that the insulation performance of the battery pack is determined to be low-grade insulation, outputting early warning prompt information, wherein the early warning prompt information is used for prompting that the current insulation performance of the battery pack is low-grade insulation.
The early warning prompt information can be at least one of a preset text prompt, a preset voice prompt or a preset image prompt.
It should be noted that, when it is determined that the insulation performance of the battery pack is low-grade insulation, the current insulation performance of the battery pack is poor, and at this time, a vehicle user should be prompted to manually check the insulation condition of the battery pack and process the weak insulation position, or replace the battery pack in time. In the case where the insulation performance of the battery pack is determined to be superior insulation, it may be temporarily left untreated to characterize that the battery pack is currently well insulated.
According to the technical scheme, the insulation performance of the battery pack can be determined according to the quantity corresponding to the message data with the insulation resistance value smaller than or equal to the preset resistance value threshold, the insulation performance of the battery pack can be timely and accurately monitored, the battery pack with lower insulation performance can be timely processed before the insulation fault of the battery pack, and therefore unsafe accidents caused by the insulation fault of the battery pack can be effectively avoided, and the safety performance of a vehicle is improved.
Fig. 2 is a block diagram illustrating a battery pack insulation performance monitoring apparatus according to another exemplary embodiment of the present disclosure; referring to fig. 2, the apparatus may include:
the receiving module 201 is used for receiving message data sent by a BMS in the vehicle from the beginning of the vehicle power-on, wherein the message data comprises the charging state information and the insulation resistance value of the battery pack;
a first determining module 202, configured to determine target packet data from the received packet data according to the charging state information;
a second determining module 203, configured to count a first quantity corresponding to the target packet data;
a third determining module 204, configured to determine, when it is determined that the first number is greater than or equal to a preset number threshold, a second number of designated message data from the first number of target message data according to the insulation resistance value in each of the target message data, where the designated message data is a message data whose insulation resistance value is less than or equal to a preset resistance value threshold;
a fourth determining module 205, configured to determine the insulation performance of the battery pack according to the second number.
According to the technical scheme, message data sent by a BMS in the vehicle is received from the vehicle electrification through a receiving module 201, wherein the message data comprises the charging state information and the insulation resistance value of a battery pack; determining target message data from the received message data according to the charging state information through a first determining module 202; counting a first quantity corresponding to the target message data through a second determining module 203; determining, by the third determining module 204, a second quantity of designated message data from the first quantity of target message data according to the insulation resistance value in each of the target message data when it is determined that the first quantity is greater than or equal to a preset quantity threshold, where the designated message data is message data whose insulation resistance value is less than or equal to a preset resistance value threshold; the insulation performance of the battery pack is determined from the second number by the fourth determination module 205. Therefore, the insulation performance of the battery pack can be determined according to the number corresponding to the message data with the insulation resistance value smaller than or equal to the preset resistance value threshold, the insulation performance of the battery pack can be timely and accurately monitored, the battery pack with lower insulation performance can be timely processed before the insulation fault of the battery pack, unsafe accidents caused by the insulation fault of the battery pack can be effectively avoided, and the safety performance of a vehicle is improved.
Optionally, the charging state information includes a fast charging state and a non-fast charging state, and the first determining module 202 is configured to:
and determining the message data with the charging state information being in a non-quick charging state as the target message data.
Optionally, the first determining module 202 is configured to:
acquiring a first frequency of the BMS for acquiring the insulation resistance;
acquiring a second frequency of the BMS for sending the message data;
and under the condition that the first frequency is less than the second frequency, determining repeated message data from the message data according to the first frequency and the second frequency, and deleting the repeated message data to obtain the remaining message data to be used.
Optionally, the fourth determining module 205 is configured to:
obtaining a target ratio of the second quantity to the first quantity;
and under the condition that the target ratio is determined to be greater than or equal to the preset ratio threshold, determining the insulation performance of the battery pack to be low-grade insulation.
FIG. 3 is a block diagram of a battery pack insulation performance monitoring device according to the embodiment shown in FIG. 2 of the present disclosure; referring to fig. 2, the apparatus may include:
and the prompting module 206 is configured to output early warning prompting information when it is determined that the insulation performance of the battery pack is low-level insulation, where the early warning prompting information is used to prompt that the current insulation performance of the battery pack is low-level insulation.
According to the technical scheme, the insulation performance of the battery pack can be determined according to the quantity corresponding to the message data with the insulation resistance value smaller than or equal to the preset resistance value threshold, the insulation performance of the battery pack can be timely and accurately monitored, the battery pack with lower insulation performance can be timely processed before the insulation fault of the battery pack, and therefore unsafe accidents caused by the insulation fault of the battery pack can be effectively avoided, and the safety performance of a vehicle is improved.
In another exemplary embodiment of the present disclosure, there is also provided a vehicle including the battery pack insulation performance monitoring apparatus described in any one of fig. 2 and 3 above.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A method for monitoring insulation performance of a battery pack, the method comprising:
receiving message data sent by a BMS in the vehicle from the beginning of the power-on of the vehicle, wherein the message data comprises the charging state information and the insulation resistance value of a battery pack;
determining target message data from the received message data according to the charging state information;
counting a first quantity corresponding to the target message data;
under the condition that the first quantity is determined to be larger than or equal to a preset quantity threshold value, determining a second quantity of specified message data from the first quantity of target message data according to the insulation resistance value in each target message data, wherein the specified message data are message data of which the insulation resistance value is smaller than or equal to a preset resistance value threshold value;
and determining the insulation performance of the battery pack according to the second number.
2. The method of claim 1, wherein the charging status information includes a fast charging status and a non-fast charging status, and wherein determining the target packet data from the received packet data according to the charging status information comprises:
and determining the message data with the charging state information being in a non-quick charging state as the target message data.
3. The method of claim 2, wherein prior to determining the message data with the charging status information in the non-fast-charging status as the target message data, the method further comprises:
acquiring a first frequency of the BMS for acquiring the insulation resistance;
acquiring a second frequency of the BMS for sending the message data;
and under the condition that the first frequency is smaller than the second frequency, determining repeated message data from the message data according to the first frequency and the second frequency, and deleting the repeated message data to obtain the remaining message data to be used.
4. The method of any of claims 1-3, wherein determining the insulation performance of the battery pack from the second number comprises:
obtaining a target ratio of the second quantity to the first quantity;
and under the condition that the target ratio is determined to be greater than or equal to a preset ratio threshold, determining the insulation performance of the battery pack to be low-grade insulation.
5. The method of claim 4, further comprising:
and under the condition that the insulation performance of the battery pack is determined to be low-grade insulation, outputting early warning prompt information, wherein the early warning prompt information is used for prompting that the current insulation performance of the battery pack is low-grade insulation.
6. A battery pack insulation performance monitoring device, the device comprising:
the receiving module is used for receiving message data sent by a BMS in the vehicle from the beginning of the electrification of the vehicle, and the message data comprises the charging state information and the insulation resistance value of the battery pack;
the first determining module is used for determining target message data from the received message data according to the charging state information;
the second determining module is used for counting a first quantity corresponding to the target message data;
a third determining module, configured to determine, when it is determined that the first number is greater than or equal to a preset number threshold, a second number of designated packet data from the first number of target packet data according to the insulation resistance value in each target packet data, where the designated packet data is a packet data whose insulation resistance value is less than or equal to a preset resistance value threshold;
and the fourth determining module is used for determining the insulation performance of the battery pack according to the second quantity.
7. The apparatus of claim 6, wherein the charge status information comprises a fast charge status and a non-fast charge status, and wherein the first determining module is configured to:
and determining the message data with the charging state information being in a non-quick charging state as the target message data.
8. The apparatus of claim 7, wherein the first determining module is configured to:
acquiring a first frequency of the BMS for acquiring the insulation resistance;
acquiring a second frequency of the BMS for sending the message data;
and under the condition that the first frequency is smaller than the second frequency, determining repeated message data from the message data according to the first frequency and the second frequency, and deleting the repeated message data to obtain the remaining message data to be used.
9. The apparatus of any of claims 6-8, wherein the fourth determining module is configured to:
obtaining a target ratio of the second quantity to the first quantity;
and under the condition that the target ratio is determined to be greater than or equal to a preset ratio threshold, determining the insulation performance of the battery pack to be low-grade insulation.
10. A vehicle comprising the battery pack insulation performance monitoring device according to any one of claims 6 to 10.
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