CN112255556B - Battery pack off-line detection method and system - Google Patents

Abstract

The invention relates to the technical field of batteries, and provides a battery pack offline detection method, which comprises the following steps: acquiring a DBC message of the battery pack in response to a test signal; analyzing the content of the DBC message, and determining whether to trigger an alarm tag; and obtaining a detection result of the battery pack according to the state of the alarm tag. Meanwhile, a battery pack off-line detection system and a corresponding storage medium are also provided. The embodiment provided by the invention has the beneficial effects of no need of increasing hardware cost, good compatibility to battery specifications and shortening detection time.

Description

Battery pack off-line detection method and system

technical field

The present invention relates to the technical field of batteries, in particular to a battery pack off-line detection method, a battery pack off-line detection system and a corresponding storage medium.

Background technique

After the battery pack is assembled, it needs to be tested offline, including: safety test, high and low voltage electrical isolation performance test, charge and discharge performance test, as well as battery pack DCR, cell DCR, dynamic pressure difference, temperature rise test, etc. , EOL test, including cell voltage, temperature, and insulation resistance reported by BMS. These test items are required by customers. There are many items and a long cycle time.

The above test items are tested one by one to determine whether the test specifications are reasonable one by one. The whole set of battery pack test items is reported through the BMS DBC. After the equipment is collected, the test specifications are compared and the current test items are qualified. Packages are mistakenly intercepted or flowed out to customers, causing serious security incidents or quality risks. Therefore, it is proposed that a new test method is needed to improve the test tempo, but at the same time, the test can cover all test items.

DBC, (Data Base CAN), database CAN file.

BMS, (BATTERY MANAGEMENT SYSTEM), battery management system.

CAN, (Controller Area Network), controller area network.

Contents of the invention

In view of this, the present invention aims to propose a battery pack off-line detection method and system to at least solve the problem of detection efficiency of failure items in the current automatic off-line test of battery packs.

In the first aspect of the present invention, a battery pack off-line detection method is provided, the detection method comprising:

Obtaining the DBC message of the battery pack responding to the test signal;

Analyzing the content of the DBC message to determine whether to trigger an alarm label;

According to the state of the warning label, the detection result of the battery pack is obtained.

Preferably, the alarm label is a label of a preset message in the DBC.

Preferably, said parsing the content of said DBC message to determine whether to trigger an alarm label includes:

Match the content of the parsed DBC message in the preset alarm policy table;

According to the matching result, determine whether to trigger the warning label;

The alarm policy table includes alarm entries corresponding to test items, and each alarm entry includes: the corresponding fault threshold, diagnostic trouble code and fault confirmation condition when the test item fails, and whether to trigger the alarm label.

Preferably, the step of parsing the content of the DBC message is performed by the BMS, and the alarm strategy table is preset in the application layer of the BMS.

Preferably, the method further includes: determining that the warning tag is triggered, and caching the DBC message that triggers the warning tag.

Preferably, the test signals are sequentially sent out by a preset program according to the test items.

In the second aspect of the present invention, a battery pack off-line detection system is also provided, and the detection system includes:

The upper computer is used to send a test signal to the battery pack according to the built-in test program of the offline test of the battery pack;

a low-voltage connector for providing a low-voltage connection interface between the detection system and the battery pack;

A power supply, used to provide low-voltage power supply to the detection system;

CAN communication module, used for CAN communication between the detection device and the charging and discharging motor; and

The detection device adopts the above-mentioned offline detection method of the battery pack to obtain the detection result of the battery pack.

Preferably, the detection device is a BMS; the BMS includes:

An acquisition module, configured to acquire the DBC message that the battery pack responds to the test signal;

An analysis and determination module is used to analyze the content of the DBC message to determine whether to trigger an alarm label;

The result output module is configured to obtain the detection result of the battery pack according to the status of the warning label.

Preferably, the BMS further includes: an EOL mode switch; the EOL mode switch is used to execute the aforementioned battery pack off-line operation after the initialization of the BMS is completed after power-on and the EOL mode switch is activated. Detection method.

The third aspect of the present invention also provides a computer-readable storage medium, where instructions are stored in the storage medium, and when the storage medium is run on a computer, the computer is made to execute the aforementioned battery pack offline detection method.

The technical solution provided by the present invention has the following beneficial effects:

(1) All items and specifications of EOL test can be determined through the existing BMS, without increasing hardware costs.

(2) The specification judgment does not need to be set on the EOL test equipment, and it is completed through the BMS DBC label reporting method, which avoids the risk of incorrect outflow of failed battery packs due to specification changes.

(3) Significantly shorten the detection time, and the test cycle can be shortened from 5min to 1min.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic implementations and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

In the attached picture:

Fig. 1 is a schematic flowchart of a battery pack off-line detection method provided by an embodiment of the present invention;

Fig. 2 is an alarm strategy table in a battery pack offline detection method provided by an embodiment of the present invention;

3 is a block diagram of a battery pack off-line detection device provided in an embodiment of the present invention;

Fig. 4 is a specific flowchart of a battery pack offline detection method provided by an embodiment of the present invention.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Fig. 1 is a schematic flowchart of a battery pack off-line detection method provided by an embodiment of the present invention. As shown in Fig. 1 , a battery pack off-line detection method includes:

Obtain the DBC message of the battery pack in response to the test signal; analyze the content of the DBC message to determine whether to trigger an alarm label; obtain the detection result of the battery pack according to the state of the alarm label.

In this way, the test result is obtained through the DBC message, and it is judged according to the test result and the preset rules: whether to trigger the alarm label. Therefore, the final result of the offline detection of the battery pack can be obtained only by obtaining the state of one warning label. This avoids the need to judge the test results of each test item, which not only improves the automation of fault judgment, but also significantly shortens the detection time.

Specifically, in this embodiment, the test signal is input and the feedback of the test signal from the battery pack is obtained. The test signal is such as a collision signal, a charging signal, a discharging signal, etc., and its test items correspond to safety test procedures and BMS static tests. Start the program, etc. The feedback of the test signal from the normal battery pack can be expected. When the feedback does not meet the required test results or an alarm signal appears, the test of the battery pack is considered to be unqualified. The alarm feedback of the battery pack is transmitted in the form of DBC messages through the CAN network. Therefore, by analyzing the DBC messages corresponding to the test signals, the alarm information is obtained, which is closer to the actual working scene and avoids the transformation of message communication. Since there are many test items, the corresponding feedback CAN messages need to be judged one by one, which seriously affects the test progress. Therefore, this embodiment adopts the method of internal judgment, sets a unified alarm label, and triggers the alarm label through the test feedback CAN message. Get the offline detection result of the battery pack based on the final state of the warning label.

In an implementation manner provided by the present invention, the alarm label is a label of a preset message in the DBC. DBC, the database CAN file, is used to analyze the signals transmitted in the CAN network. The alarm label needs to be defined for its implementation. In this embodiment, a frame message is added to the existing CAN communication matrix, and it can be named BMS_EOL_syserr. The value reported by BMS_EOL_syserr is 1 or 0. When it reports 1 failure package failure analysis, when it reports 0, the normal battery pack is offline and shipped. By setting the label as the format of the CAN message, the communication network of the actual battery pack is used, and the improvement of the communication mechanism of the battery pack management is avoided.

In an embodiment provided by the present invention, the parsing the content of the DBC message to determine whether to trigger an alarm label includes: matching the content of the parsed DBC message in a preset alarm strategy table ;According to the matching result, determine whether to trigger the alarm label; the alarm policy table includes alarm entries corresponding to the test items, and each alarm entry includes: the corresponding failure threshold, diagnostic trouble code and failure confirmation when the test item is unqualified condition, and whether to trigger the alert tag. Fig. 2 is an alarm policy table in the battery pack off-line detection method provided by an embodiment of the present invention. The alarm policy table is a table made according to summarizing all test items and test specifications of EOL required by customers. Testers can make adaptive adjustments to the alarm strategy table according to actual test requirements, and increase or decrease the content in the table. The fault name and code items in the table use the existing alarm list, and whether it triggers the alarm label is a column that needs to be added in this embodiment.

In an implementation manner provided by the present invention, the step of parsing the content of the DBC message is performed by a BMS, and the alarm policy table is preset in an application layer of the BMS. BMS, battery management system, is a management device for batteries in electric vehicles. Its functions include: charge and discharge control, dynamic monitoring and battery balancing, and also includes fault management of batteries. In the prior art, battery alarms are transmitted to the BMS through the CAN network and presented. Therefore, in this embodiment, the use of the BMS to analyze the DBC message only utilizes the original functions of the BMS and does not increase the burden on the BMS. At the same time, the alarm policy table is preset in the application layer of the BMS, through the function development of the application layer, the judgment program of the alarm label is written, and the alarm is continuously matched with the pre-written alarm policy table to obtain the alarm label. trigger logic.

In an implementation manner provided by the present invention, the method further includes: determining that the warning tag is triggered, and caching the DBC message that triggers the warning tag. When the alarm label is triggered, it can be concluded that the offline test of the battery pack "failed". In order to further troubleshoot the fault, it is necessary to locate the specific fault code to obtain the phenomenon and cause of the fault. Therefore, after the alarm tag is triggered, the DBC message triggering the alarm tag is further cached in the test system or BMS for the detection party to read, so as to facilitate the troubleshooting of the specific cause of the battery failure.

Preferably, the test signals are sequentially sent out by a preset program according to the test items. Existing battery tests all adopt the automatic test method. According to the foregoing, a host computer equipped with a preset program can be used to execute the test steps sequentially and send the test signals sequentially. Through the automatic test of the preset program, not only the test efficiency is improved, but also the actual operating condition of the vehicle can be simulated.

In one embodiment provided by the present invention, a battery pack off-line detection system is also provided. The detection system includes: a host computer, which is used to send the battery package to send test signals; taking the safety test as an example, in this embodiment, the safety test program is loaded on the host computer, which can control the power battery pack and the circuits and devices that are adapted to the power battery pack for safety test Wait to complete the required safety test items.

The low-voltage connector is used to provide the low-voltage connection interface between the detection system and the battery pack; the model in this embodiment is preferably the HE-024-M connector, which has the characteristics of good insulation performance, high safety factor and convenient installation .

Power supply, used to provide low-voltage power supply to the detection system; commonly used low-voltage power supply is 12V,

The CAN communication module is used for the CAN communication connection of the detection device and the charging and discharging machine; and the detection device adopts the aforementioned battery pack off-line detection method to obtain the detection result of the battery pack.

In one embodiment provided by the present invention, the detection device is a BMS; the BMS includes: an acquisition module, configured to acquire the DBC message of the battery pack in response to the test signal; an analysis and determination module, configured to analyze the The content of the DBC message is used to determine whether to trigger the warning label; the result output module is used to obtain the detection result of the battery pack according to the state of the warning label. Fig. 3 is a module structure diagram of a battery pack off-line detection device provided by an embodiment of the present invention. As shown in Fig. 3, the multiple modules/units may be a series of computer program instruction segments capable of completing specific functions. The instruction segment is used to describe the execution process of the computer program in the terminal device. For example, the computer program can be divided into an acquisition module, an analysis and determination module, and a result output module (modules in the virtual device), and the specific functions of each module are as described above.

In an implementation manner provided by the present invention, the BMS further includes: an EOL mode switch; the EOL mode switch is used when the initialization of the BMS is completed after the BMS is powered on, and the EOL mode switch is in an active state , executing the aforementioned battery pack offline detection method. By setting the EOL mode switch, it has the following advantages: the BMS_EOL_Syserr label only reports a fault when it is switched to the EOL mode, and when the aforementioned label is not activated, the BMS performs normal operations. After the vehicle is offline, turn off the "EOL mode switch", at this time the BMS switches back to the "vehicle mode", and the vehicle end will not cause false alarms due to the different specifications of the offline test and the vehicle, so it has good compatibility sex.

Fig. 4 is a specific flow chart of a battery pack off-line detection method provided in an embodiment of the present invention, as shown in Fig. 4 , including the following steps:

1) The battery pack is connected to the power supply through a low-voltage connector to obtain a working voltage of 12V;

2) After the BMS initialization is completed, judge the state of the EOL mode switch;

3) After confirming that the EOL mode is enabled, start reading the DBC message triggered by the test signal;

4) During the test, monitor whether the state of BMS_EOL_syserr is 0;

5) If it is not 0, then analyze the DBC message data by checking the strategy table;

6) Locate the unqualified item that triggers BMS_EOL_syserr, and repair it accordingly;

7) After the repair is complete, continue with the test. If the repair cannot be completed, the battery is discarded as a failed component.

In one embodiment provided by the present invention, a storage medium is also provided, and instructions are stored in the storage medium, and when the instructions are run on a computer, the computer is made to execute the aforementioned method for detecting that the battery pack is offline.

Through the implementation method provided by the present invention, all items of the EOL test and specification judgment can be realized through the existing BMS, without increasing hardware costs; and the specification judgment does not need to be set on the EOL test equipment, and can be reported through the BMS DBC label Completed, avoiding the risk of false outflow of failed battery packs due to specification changes. Specifically, by detecting system faults reported by BMS DBC, BMS_EOL_Syserr identifies system faults of the entire package, and all faults of the entire vehicle can be found through one test. The test specification does not need to be set, and the test cycle can be shortened from 5min to 1min without increasing Test cost is a better test solution for offline testing with low cost, high efficiency and error-free.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims (8)

1. A battery pack offline detection method, characterized in that the detection method comprises:

acquiring a DBC message of the battery pack in response to a test signal;

analyzing the content of the DBC message, and determining whether to trigger an alarm tag;

obtaining a detection result of the battery pack according to the state of the alarm tag;

the alarm tag is a tag of a preset message in the DBC; the analyzing the content of the DBC message and determining whether to trigger an alarm tag comprises the following steps:

matching the content of the analyzed DBC message in a preset alarm strategy table;

determining whether to trigger an alarm tag according to the matching result;

the alarm policy table includes alarm entries corresponding to test items, each alarm entry including: and the fault threshold value, the diagnosis fault code and the fault confirmation condition corresponding to the unqualified test item and whether the alarm tag is triggered or not.

2. The method according to claim 1, wherein the parsing the contents of the DBC message is performed by a BMS, and the alarm policy table is preset in an application layer of the BMS.

3. The method of detection according to claim 1, wherein the method of detection further comprises:

and determining that the alarm tag is triggered, and caching DBC messages for triggering the alarm tag.

4. The method according to claim 1, wherein the test signals are sequentially emitted by a preset program according to the test items.

5. A battery pack offline detection system, the detection system comprising:

the upper computer is used for sending a test signal to the battery pack according to a built-in detection program for detecting the battery pack in an off-line manner;

a low voltage connector for providing a low voltage connection interface of the detection system and the battery pack;

the power supply is used for providing low-voltage power supply for the detection system;

the CAN communication module is used for CAN communication between the detection device and the charging and discharging machine; and

the detection device obtains a detection result of the battery pack by adopting the battery pack offline detection method according to any one of claims 1 to 4.

6. The detection system of claim 5, wherein the detection device is a BMS; the BMS includes:

the acquisition module is used for acquiring the DBC message of the battery pack responding to the test signal;

the analysis judging module is used for analyzing the content of the DBC message and determining whether an alarm tag is triggered or not;

and the result output module is used for obtaining the detection result of the battery pack according to the state of the alarm tag.

7. The detection system of claim 6, wherein the BMS further comprises: an EOL mode switch;

the EOL mode switch is used to perform the battery pack offline detection method of any one of claims 1 to 4 when the EOL mode switch is in an active state after initialization is completed after the BMS is powered up.

8. A computer readable storage medium having instructions stored therein, which when run on a computer causes the computer to perform the battery pack offline detection method according to any one of claims 1 to 4.

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