CN112255556A

CN112255556A - Battery pack offline detection method and system

Info

Publication number: CN112255556A
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: 2021-01-22
Anticipated expiration: 2040-04-30
Also published as: CN112255556B

Abstract

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

Description

Battery pack offline detection method and system

Technical Field

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

Background

The battery package need be carried out the detection of rolling off the production line after the equipment is accomplished, specifically includes: safety test, high-low voltage electrical isolation performance test, charge and discharge performance test still include test battery package DCR, electric core DCR, dynamic pressure difference, temperature rise test etc. and EOL test, including the electric core voltage, temperature, the insulation resistance that the BMS reported, these test items are the must test item that the customer proposed, and the project is various, and the beat is longer.

The test items are tested one by one, whether the test specification is reasonable or not is judged one by one, the whole set of battery pack test items are reported through the BMS DBC, the test specification is compared with the current test item after the equipment is collected, whether the current test item is qualified or not is judged, if the test specification is set wrongly, the test item is judged wrongly, the battery pack is intercepted wrongly or is wrongly output to a client, and serious safety accidents or quality risks are caused. Therefore, a new testing method is provided, the testing beat is improved, and the testing can cover all the testing items at the same time.

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

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 a battery pack offline, so as to at least solve the problem of efficiency in detecting a failure item in an offline automatic test of a battery pack.

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

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

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

and obtaining the 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 and 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 a matching result;

the alarm policy table includes alarm entries corresponding to test items, each alarm entry including: and the corresponding fault threshold, the diagnosis fault code and the fault confirmation condition when the test item is unqualified, and whether the alarm tag is triggered.

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 the DBC message 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, including:

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

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

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

the CAN communication module is used for the CAN communication between the detection device and the charge and discharge machine; and

the detection device obtains the detection result of the battery pack by adopting the battery pack offline detection method.

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

the acquisition module is used for acquiring a 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 to trigger an alarm tag 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 above-mentioned battery pack offline detection method after the initialization of the BMS 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, which stores instructions that, when run on a computer, cause the computer to execute the foregoing battery pack offline detection method.

Through the technical scheme provided by the invention, the following beneficial effects are achieved:

(1) all items and specification judgment of the EOL test can be realized through the existing BMS, and the hardware cost is not required to be increased.

(2) The specification judgment is finished in a BMS DBC label reporting mode without setting on EOL testing equipment, and the risk of mistakenly flowing out of a failed battery pack caused by the fact that the specification is changed is avoided.

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

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

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit 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 an alarm policy table in the offline detection method for a battery pack according to an embodiment of the present invention;

fig. 3 is a block diagram of a battery pack offline detection apparatus 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 conflict.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

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

acquiring a DBC message of the battery pack responding to a test signal; analyzing the content of the DBC message, and determining whether to trigger an alarm tag; and obtaining the 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 to trigger an alarm tag. Therefore, the final result of offline detection of the battery pack can be obtained only by acquiring the state of one alarm tag. Therefore, the judgment of the test result of each test item is avoided, the automation of fault judgment is improved, and the detection time is obviously shortened.

Specifically, in the present embodiment, a test signal, such as a collision signal, a charge signal, a discharge signal, etc., is input, and feedback of the battery pack to the test signal is obtained, and the test items correspond to a safety test program, a BMS static test start program, etc. Feedback of a normal battery pack to the test signal is expected, and when the feedback of the normal battery pack does not accord with the required test result or an alarm signal appears, the battery pack is considered to be unqualified. The warning feedback of the battery pack is transmitted in the form of the DBC message through the CAN network, so that the warning information is acquired by analyzing the DBC message corresponding to the test signal, the actual working scene is closer, and message communication is prevented from being modified. Because a plurality of test items are needed, the corresponding feedback CAN messages need to be distinguished one by one, and the test progress is seriously influenced, therefore, the embodiment adopts an internal judgment method, sets a uniform alarm tag, and obtains the offline detection result of the battery pack in the final state of the alarm tag by triggering the alarm tag through the test feedback CAN messages.

In an embodiment provided by the present invention, the alarm tag is a tag of a preset message in the DBC. The DBC, i.e. the database CAN file, is used to parse the signals transmitted in the CAN network. The alarm tag needs to be defined, and this embodiment is implemented by adding a frame of message to the existing CAN communication matrix, and may be named BMS _ EOL _ syserr. And the value reported by the BMS _ EOL _ syserr is 1 or 0, and when the failure analysis of the fault packet is reported by the BMS _ EOL _ syserr and the failure analysis of the fault packet is reported by the BMS _ EOL _ syserr, the normal battery packet is delivered from the production line when the failure analysis of the fault packet is reported by the. By setting the label into the format of the CAN message, the communication network of the actual battery pack is utilized, and the improvement on the communication mechanism of the battery pack management is avoided.

In an embodiment provided by the present invention, the analyzing the content of the DBC packet and 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 a matching result; the alarm policy table includes alarm entries corresponding to test items, each alarm entry including: and the corresponding fault threshold, the diagnosis fault code and the fault confirmation condition when the test item is unqualified, and whether the alarm tag is triggered. Fig. 2 is an alarm policy table in the offline detection method for battery packs according to an embodiment of the present invention, where the alarm policy table is a table created according to all test items and test specifications of EOL requested by a summary customer. The tester can adaptively adjust the alarm policy table according to the actual test requirements, and increase or decrease the contents in the table. The fault name and code entry in the table is the column that needs to be added in this embodiment, using the existing alarm list, whether it triggers an alarm tag.

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 function of realizing includes: charging and discharging control, dynamic monitoring and battery balancing, and also comprises fault management of the battery. In the prior art, the alarm of the battery is transmitted to the BMS through the CAN network and is presented, so that the BMS is adopted to analyze the DBC message in the embodiment mode, the original function of the BMS is only utilized, and the burden of the BMS cannot be increased. And meanwhile, presetting the alarm strategy table in an application layer of the BMS, writing a judgment program of the alarm tag through function development of the application layer, and continuously matching the alarm with the alarm strategy table which is written in advance to obtain the trigger logic of the alarm tag.

In one embodiment provided by the present invention, the method further comprises: and determining that the alarm tag is triggered, and caching the DBC message triggering the alarm tag. When the alarm tag is triggered, the conclusion that the battery pack offline test is failed can be obtained. For further troubleshooting, specific fault codes need to be located to acquire phenomena and reasons of fault generation. Therefore, after the alarm tag is triggered, the DBC message triggering the alarm tag is further cached in a test system or a 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 tests all adopt an automatic test mode, and according to the above, an upper computer configured with a preset program can be adopted to perform the test steps and send out the test signals in sequence. Through the automatic test of presetting the procedure, not only promoted efficiency of software testing, can also simulate the actual running condition of vehicle.

In an embodiment provided by the present invention, a system for detecting a battery pack offline is further provided, where the system includes: the upper computer is used for sending a test signal to the battery pack according to a built-in test program for the offline test of the battery pack; taking the safety test as an example, in the present embodiment, a safety test program is loaded on the upper computer, and the safety test program can control the power battery pack and the circuit and the device adapted to the power battery pack to perform the safety test to complete each required safety test item.

The low-voltage connector is used for providing a low-voltage connection interface between the detection system and the battery pack; the preferred model in this embodiment is HE-024-M connector, has good insulating properties, and factor of safety is high and simple to operate's characteristics.

The power supply is used for supplying low-voltage power to the detection system; a common low voltage power supply is 12V,

the CAN communication module is used for CAN communication connection of the detection device and the charge and discharge machine; and the detection device obtains the detection result of the battery pack by adopting the battery pack offline detection method.

In one embodiment of the present invention, the detecting means is a BMS; the BMS includes: the acquisition module is used for acquiring a 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 to trigger an alarm tag 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 offline detection apparatus according to an embodiment of the present invention, and as shown in fig. 3, the modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the 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 a virtual device), and the specific functions of the respective modules are 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 above-mentioned battery pack offline detection method after the initialization of the BMS 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 provided: the BMS _ EOL _ Syserr tag reports a failure only when switching to EOL mode, and when the aforementioned tag is not active, the BMS performs normal operations. After the whole vehicle is off-line, the EOL mode switch is closed, the BMS is switched back to the whole vehicle mode, and the problem of false alarm caused by different off-line test specifications and the whole vehicle at the whole vehicle end is solved, so that the compatibility is good.

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

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

2) judging the state of an EOL mode switch after the BMS initialization is finished;

3) after the starting of the EOL mode is confirmed, starting to read a DBC message triggered by a test signal;

4) monitoring whether the state of BMS _ EOL _ syserr is 0 or not in the test process;

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

6) positioning and triggering an unqualified project of the BMS _ EOL _ syserr, and performing corresponding repair on the unqualified project;

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

In an embodiment of the present invention, a storage medium is further provided, where instructions are stored in the storage medium, and when the storage medium runs on a computer, the instructions cause the computer to execute the foregoing method for detecting a battery pack offline.

By the implementation method provided by the invention, all items and specification judgment of the EOL test can be realized through the existing BMS without increasing the hardware cost; and specification judgment is not required to be set on EOL test equipment, and can be completed in a BMS DBC label reporting mode, so that the risk of mistakenly flowing out of a failed battery pack caused by specification change is avoided. Specifically, the system faults reported by the BMS DBC are detected, the BMS _ EOL _ Syserr identifies the system faults of the whole package, all the faults of the whole vehicle can be found through one test, the test specification is not required to be set, the test beat can be shortened to 1min from 5min, the test cost is not increased, and the method is a good test solution for the offline test with low cost, high efficiency and no errors.

As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The 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 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

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

Claims

1. A battery pack offline detection method is characterized by comprising the following steps:

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

2. The detection method according to claim 1, wherein the alarm tag is a tag of a preset message in the DBC.

3. The detection method according to claim 2, wherein the parsing the content of the DBC packet and determining whether to trigger an alarm tag comprises:

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

4. The detecting method according to claim 3, wherein 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.

5. The detection method according to claim 1, further comprising:

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

6. The method according to claim 2, wherein the test signals are sequentially issued by a predetermined program according to the test items.

7. 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 offline detection of the battery pack;

the detection device adopts the offline detection method of the battery pack according to any one of claims 1 to 6 to obtain the detection result of the battery pack.

8. The detection system according to claim 7, wherein the detection device is a BMS; the BMS includes:

9. The detection system of claim 8, wherein the BMS further comprises: an EOL mode switch;

the EOL mode switch is used to perform the method of detecting a battery pack offline according to any one of claims 1 to 6 when the initialization is completed after the BMS is powered on and the EOL mode switch is in an activated state.

10. A computer-readable storage medium having instructions stored thereon, which when run on a computer, cause the computer to perform the method of battery pack offline detection of any of claims 1 to 6.