CN112255556B

CN112255556B - Battery pack offline detection method and system

Info

Publication number: CN112255556B
Application number: CN202010366482.8A
Authority: CN
Inventors: 魏海潮; 贾智军
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2023-06-02
Anticipated expiration: 2040-04-30
Also published as: CN112255556A

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 offline detection method and system

Technical Field

The present invention relates to the field of battery technologies, and in particular, to a battery pack offline detection method, a battery pack offline detection system, and a corresponding storage medium.

Background

The battery package needs to carry out the off-line detection after the equipment is accomplished, specifically includes: safety testing, high-low voltage electric isolation performance testing, charging and discharging performance testing, and further comprises testing battery packs DCR, battery cells DCR, dynamic differential pressure, temperature rise testing and the like, EOL testing, including battery cell voltage, temperature and insulation resistance reported by BMS, wherein the testing items are necessary testing items proposed by customers, and are various in items and long in beat.

The test items are tested one by one, whether the test specification is reasonable or not is judged one by one, the whole battery pack test item is reported through the BMS DBC, the test specification is compared with the current test item to be qualified or not after equipment collection, if the test specification is set wrong, the test item misjudgment leads to the battery pack to be intercepted or flow out to a customer by one, and serious safety accidents or quality risks are caused. Therefore, a new test method is needed to improve the test beat, but the test can cover all test items at the same time.

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

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

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

Disclosure of Invention

In view of the above, the present invention is directed to a method and a system for detecting the offline of a battery pack, so as to at least solve the problem of detecting the failure item in the current offline automatic test of the battery pack.

In a first aspect of the present invention, there is provided a battery pack offline detection method, the detection method comprising:

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.

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

Preferably, the analyzing the content of the DBC message, determining whether to trigger an alarm tag includes:

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.

Preferably, 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.

Preferably, the method further comprises: and determining that the alarm tag is triggered, and caching DBC messages for triggering the alarm tag.

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

In a second aspect of the present invention, there is also provided a battery pack offline detection system, the detection system including:

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

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 adopts the battery pack offline detection method to obtain the detection result of the battery pack.

Preferably, 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.

Preferably, the BMS further comprises: an EOL mode switch; the EOL mode switch is used for executing the battery pack off-line detection method when the initialization is completed after the BMS is powered on and the EOL mode switch is in an activated state.

The third aspect of the present invention also provides a computer-readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the aforementioned battery pack offline detection method.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

(1) All items and specification decisions of the EOL test can be realized through the existing BMS without increasing hardware cost.

(2) The specification determination is not required to be set on EOL test equipment, and is completed in a BMS DBC label reporting mode, so that the risk of false outflow of the invalid battery pack caused by the change of the specification is avoided.

(3) The detection time is obviously shortened, and the test beat can be shortened from 5min to 1min.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, illustrate and explain the invention and are not to be construed as limiting the invention.

In the drawings:

fig. 1 is a schematic flow chart of a battery pack offline detection method according to an embodiment of the present invention;

FIG. 2 is a table of alarm policies in a method for detecting battery pack offline according to an embodiment of the present invention;

fig. 3 is a block diagram of a battery pack off-line detection device according to an embodiment of the present invention;

fig. 4 is a specific flowchart of a battery pack offline detection method according to an embodiment of the present invention.

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

Fig. 1 is a schematic flow chart of a battery pack offline detection method according to an embodiment of the present invention, as shown in fig. 1, and the detection method includes:

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.

Thus, a test result is obtained through the DBC message, and judgment is carried out according to the test result and a preset rule: whether an alarm tag is triggered. Therefore, the final result of the offline detection of the battery pack can be obtained only by acquiring the state of one alarm tag. Therefore, judgment of the test result of each test item is avoided, automation of fault judgment is improved, and detection time is shortened obviously.

Specifically, in this embodiment, a test signal, for example, a collision signal, a charging signal, a discharging signal, and the like, is input, and feedback of the test signal from the battery pack is obtained, where the test item corresponds to a safety regulation test program, a BMS static test start program, and the like. A normal battery pack is expected to feedback a test signal, and when the feedback does not meet the required test result or an alarm signal appears, the test of the battery pack is considered to be failed. The alarm feedback of the battery pack is transmitted in the form of DBC message through the CAN network, so that the alarm information is acquired by analyzing the DBC message corresponding to the test signal, the actual working scene is more similar, and the reconstruction of the message communication is avoided. Because the test items are numerous, the corresponding feedback CAN messages need to be judged one by one, and the test progress is seriously influenced, the embodiment adopts an internal judging method, a unified alarm tag is set, and the off-line detection result of the battery pack is obtained in the final state of the alarm tag through the triggering of the alarm tag by the test feedback CAN messages.

In one embodiment of the present invention, the alert tag is a tag of a preset message in the DBC. The DBC, i.e. the database CAN file, is used for parsing the signals transmitted in the CAN network. The alarm tag needs to be defined in implementation, and this embodiment is implemented by adding a frame of message to the existing CAN communication matrix, and may be named bms_eol_syser. The value reported by BMS_EOL_syserr is 1 or 0, and when the BMS_EOL_syserr reports 1 failure packet failure analysis and reports 0, the normal battery packet is delivered offline. By setting the tag to the format of a CAN message, the communication network of the actual battery pack is utilized, and the improvement on the communication mechanism of battery pack management is avoided.

In one embodiment of the present invention, the parsing the content of the DBC message to determine whether to trigger an alarm tag includes: 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. Fig. 2 is an alarm policy table in the battery pack offline detection method according to an embodiment of the present invention, where the alarm policy table is a table made by summarizing all test items and test specifications of the customer request EOL. The tester can adaptively adjust the alarm policy table according to the actual test requirement, and increase or decrease the content in the table. The fault name and code entry in the table is to use an existing alarm list, and whether it triggers an alarm tag is the column that needs to be added in this embodiment.

In an embodiment of 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 the management device to the battery in the electric automobile, and its realization function includes: charge and discharge control, dynamic monitoring and battery balancing also include fault management of the battery. In the prior art, the warning of battery all transmits to BMS and presents through CAN network, consequently this embodiment adopts BMS to carry out the analysis of DBC message and has only utilized BMS's original function, CAN not increase BMS's burden. Meanwhile, the alarm strategy table is preset in an application layer of the BMS, a judging program of the alarm tag is written in through function development of the application layer, and the alarm is continuously matched with the pre-written alarm strategy table, so that trigger logic of the alarm tag is obtained.

In one embodiment provided by the present invention, the method further comprises: and determining that the alarm tag is triggered, and caching DBC messages for triggering the alarm tag. When the alarm tag is triggered, a conclusion of "failed" of the battery pack offline test can be drawn. To further troubleshoot the fault, a specific fault code needs to be located 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 a test system or BMS for a detection party to read, so that the specific fault reason of the battery can be conveniently checked.

Preferably, the test signals are sequentially sent out by a preset program according to the test items. The existing battery test adopts an automatic test mode, and as described above, an upper computer configured with a preset program can be adopted to execute the test steps in sequence and send out test signals in sequence. Through the automatic test of the preset program, the test efficiency is improved, and the actual running condition of the vehicle can be simulated.

In one embodiment of the present invention, there is also provided a battery pack offline detection system, including: the upper computer is used for sending a test signal to the battery pack according to a built-in test program of the battery pack offline test; taking the safety test as an example, in the present embodiment, a safety test program is loaded on the host computer, which can control the power battery pack and circuits, devices, etc. adapted to the power battery pack to perform safety test to complete each safety test item required.

A low voltage connector for providing a low voltage connection interface of the detection system and the battery pack; the model in this embodiment is preferably HE-024-M connector, has the characteristics of good insulating properties, high safety coefficient and convenient installation.

The power supply is used for providing low-voltage power supply for the detection system; a commonly used low voltage power supply is 12V,

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

In one embodiment of the present invention, 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. Fig. 3 is a block diagram of a battery pack off-line detection apparatus according to an embodiment of the present invention, and as shown in fig. 3, the plurality of modules/units may be a series of instruction segments of a computer program capable of performing a specific function, where the instruction segments describe an execution process of the computer program in a terminal device. For example, the computer program may be divided into an acquisition module, an analysis determination module, and a result output module (module in the virtual device), each module having a specific function as described above.

In one embodiment provided by the present invention, the BMS further includes: an EOL mode switch; the EOL mode switch is used for executing the battery pack off-line detection method when the initialization is completed after the BMS is powered on and the EOL mode switch is in an activated state. By setting the EOL mode switch, the following advantages are achieved: the bms_eol_syerr tag reports a failure only when switching to EOL mode, and when the aforementioned tag is not activated, the BMS performs normal operation. After the whole vehicle is off line, the EOL mode switch is turned off, and the BMS is switched back to the whole vehicle mode, so that the problem of false alarm of the whole vehicle end cannot be caused by different off-line test specifications and different whole vehicles, and the BMS has good compatibility.

Fig. 4 is a specific flowchart of a battery pack offline detection method according to an embodiment of the present invention, as shown in fig. 4, including the following steps:

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

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

3) After confirming that the EOL mode is started, starting to read the DBC message triggered by the test signal;

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

5) If not, analyzing DBC message data through a strategy table;

6) Positioning unqualified items of the trigger BMS_EOL_syserr, and repairing the unqualified items correspondingly;

7) After the repair is completed, the test is continued. If the repair cannot be completed, the battery is scrapped as a failed component.

In one embodiment of the present invention, a storage medium is further provided, where instructions are stored, which when executed on a computer, cause the computer to perform the aforementioned battery pack offline detection method.

By the implementation method provided by the invention, all items and specification judgment of EOL test can be realized through the existing BMS without increasing hardware cost; and specification judgment can be completed by a BMS DBC label reporting mode without setting on EOL test equipment, so that the risk of false outflow of a dead battery pack caused by specification change is avoided. Specifically, through detecting the system fault that BMS DBC reported, BMS_EOL_Syser discerns the system fault of whole package, can discover all the trouble of whole car through a test, and the test specification need not set up, and the test beat can shorten to 1min from 5min, and does not increase test cost, is the better test solution of low-cost high-efficient non-error of test of cutting off the line.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

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

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

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;

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:

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

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;

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:

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.