CN111439127A - Vehicle and battery pack fault detection method and device - Google Patents
Vehicle and battery pack fault detection method and device Download PDFInfo
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- CN111439127A CN111439127A CN201911413642.3A CN201911413642A CN111439127A CN 111439127 A CN111439127 A CN 111439127A CN 201911413642 A CN201911413642 A CN 201911413642A CN 111439127 A CN111439127 A CN 111439127A
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- battery
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a fault detection method and a fault detection device for a vehicle and a battery pack, wherein the battery pack comprises a plurality of battery modules, and the method comprises the following steps: acquiring the temperature of a first detection point of each battery module to obtain a first temperature detection value; acquiring the temperature of a second detection point of each battery module to obtain a second temperature detection value; and determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. From this, through the temperature of two check points on every module in the control battery package, the electric connection state of prejudgement battery package can realize real time monitoring, real time diagnosis's characteristics on whole car, discerns the latent risk of battery package in advance and became invalid, makes the diagnosis in advance, avoids in the battery package because copper bar connecting bolt pine produces the thermodiffusion, promotes whole car security.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a fault detection method and a fault detection device for a vehicle and a battery pack.
Background
The power battery pack is generally formed by connecting a plurality of battery modules in series, and the battery modules are connected with each other through bolts by using high-voltage copper bars. After the electric automobile is used for several years or tens of thousands of kilometers, the connecting bolt in the power battery pack gradually attenuates the moment. If at the vehicle in-process of traveling, because the automobile body vibration has certain probability to lead to copper bar junction to become flexible or virtual joint between the module, the power battery package can not normally work will be led to connecting becoming flexible or virtual joint of copper bar.
In the related art, fastening of an electrical connection part is generally performed by using a bolt with a threaded fastening glue, but there are problems in that an actual assembly process is complicated, and bolt connection stability cannot be effectively monitored after sale, with a risk.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide a method for detecting a fault of a battery pack, so as to detect an electrical connection state between battery modules, and to perform real-time monitoring and real-time diagnosis on a whole vehicle.
A second object of the present invention is to provide a failure detection device for a battery pack.
A third object of the invention is to propose a vehicle.
A fourth object of the invention is to propose a computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for detecting a fault of a battery pack, where the battery pack includes a plurality of battery modules, and the method includes: acquiring the temperature of a first detection point of each battery module to obtain a first temperature detection value; acquiring the temperature of a second detection point of each battery module to obtain a second temperature detection value; and determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
According to the fault detection method of the battery pack provided by the embodiment of the invention, the connection state of the corresponding battery module is determined according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. Therefore, the temperature of two detection points on each module in the battery pack is monitored, the electric connection state of the battery pack is judged in advance, the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
According to an embodiment of the present invention, the determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module includes: judging whether the temperature difference between a first temperature detection value and a second temperature detection value of the battery module is greater than or equal to a first temperature threshold value or not; and if the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value, determining that the corresponding battery module is abnormal in connection.
According to an embodiment of the present invention, the first detection point is located in a low temperature region of the battery module, and the second detection point is located in a high temperature region of the battery module, wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
According to one embodiment of the present invention, the first detection point is located in a peripheral region of the battery module, the second detection point is located in a middle region of the battery module, and the peripheral region is located at the periphery of the middle region.
In order to achieve the above object, a failure detection device for a battery pack according to an embodiment of a second aspect of the present invention includes a plurality of battery modules, the device including: the first temperature detection units respectively correspond to the battery modules, and each of the first temperature detection units is used for detecting the temperature of a first detection point of each battery module to obtain a first temperature detection value; the plurality of second temperature detection units respectively correspond to the plurality of battery modules, and each of the plurality of second temperature detection units is used for detecting the temperature of a second detection point of each battery module to obtain a second temperature detection value; and the processing unit is used for determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
According to the fault detection device of the battery pack provided by the embodiment of the invention, the connection state of the corresponding battery module is determined according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. Therefore, the temperature of two detection points on each module in the battery pack is monitored, the electric connection state of the battery pack is judged in advance, the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
According to one embodiment of the invention, the processing unit is further configured to determine whether a temperature difference between a first temperature detection value and a second temperature detection value of the battery module is greater than or equal to a first temperature threshold value, and determine that a connection abnormality occurs in the corresponding battery module when the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value.
According to an embodiment of the present invention, the first detection point is located in a low temperature region of the battery module, and the second detection point is located in a high temperature region of the battery module, wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
According to one embodiment of the present invention, the first detection point is located in a peripheral region of the battery module, the second detection point is located in a middle region of the battery module, and the peripheral region is located at the periphery of the middle region.
In order to achieve the above object, a vehicle according to a third aspect of the present invention includes the battery pack failure detection device.
According to the vehicle provided by the embodiment of the invention, the electric connection state of the battery pack is judged in advance by monitoring the temperature of two detection points on each module in the battery pack, so that the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
In order to achieve the above object, a computer-readable storage medium according to a fourth aspect of the present invention is provided, on which a computer program is stored, and the computer program is executed by a processor to implement the method for detecting a failure of a battery pack.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method of detecting a failure of a battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a temperature sensing location according to an embodiment of the present invention;
fig. 3 is a flowchart of a method of detecting a failure of a battery pack according to an embodiment of the present invention; and
fig. 4 is a block diagram illustrating a failure detection apparatus of a battery pack according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method of detecting a failure of a battery pack according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting a failure of a battery pack according to an embodiment of the present invention. The battery pack comprises a plurality of battery modules, for example, the power battery pack is generally formed by connecting a plurality of battery modules in series, and the battery modules are connected with each other through bolts by using high-voltage copper bars.
As shown in fig. 1, the method for detecting a fault of a battery pack according to an embodiment of the present invention includes the following steps:
s1: the temperature of the first detection point of each battery module is obtained to obtain a first temperature detection value.
S2: and acquiring the temperature of a second detection point of each battery module to obtain a second temperature detection value.
It can be understood that each battery module has two detection points, the temperature of the first detection point of each battery module can be detected by the first temperature detection unit arranged at the first detection point of each battery module to obtain a first temperature detection value, and the temperature of the second detection point of each battery module can be detected by the second temperature detection unit arranged at the second detection point of each battery module to obtain a second temperature detection value.
According to an embodiment of the present invention, the first detection point may be located in a low temperature region of the battery module, and the second detection point may be located in a high temperature region of the battery module, wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
According to an embodiment of the present invention, the first detection point may be located at a peripheral region of the battery module, and the second detection point may be located at a central region of the battery module, the peripheral region being located at a periphery of the central region, the peripheral region having a temperature lower than that of the central region.
As an example, as shown in fig. 2, for the VDA standard module, two temperature detecting units, such as temperature sensors, are provided on one battery module, and the two temperature sensors respectively collect the highest temperature (the second detecting point NTC2) and the lowest temperature (the first detecting point NTC1) of the battery module.
During the normal charging and discharging process of the battery module, the temperature of the second detection point NTC2 is always higher than that of the first detection point NTC1 of the second detection point, because the second detection point NTC2 represents the highest temperature of the current battery module, and the first detection point NTC1 represents the lowest temperature of the current battery module.
S3: and determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
It can be understood that when the copper bar connecting bolt on one side of the battery module is loosened, the contact resistance at the electric connection position of the copper bar and the battery module is increased, and a large amount of heat is generated in the charging and discharging process. The heat gradually spreads to the first detection point NTC1 within the battery module. The temperature of the first detecting point NTC1 is sharply increased at this time, and when the temperature of the first detecting point NTC1 is higher than the temperature of the second detecting point NTC2, it is diagnosed that there is an abnormality in the electrical connection of the battery module at this time.
According to an embodiment of the present invention, determining the connection state of the corresponding battery module according to a temperature difference between the first temperature detection value and the second temperature detection value of each battery module includes:
judging whether the temperature difference between a first temperature detection value and a second temperature detection value of the battery module is greater than or equal to a first temperature threshold value or not;
and if the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value, determining that the corresponding battery module is abnormal in connection.
In addition, if the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is less than the first temperature threshold value, it is determined that the corresponding battery module is normally connected.
It is noted that, based on the analysis of the big data of the power battery, it is considered that the first temperature threshold value can be set to 4 ℃ or above. That is, when the second temperature detection value of NTC1 minus the first temperature detection value of NTC2 is greater than or equal to 4 ℃, it is an abnormal situation.
It should be further noted that the method for detecting a fault of a battery pack according to an embodiment of the present invention may be performed by a battery management system.
More specifically, during actual use, the battery modules and the detection points may be numbered, for example, the numbers of N battery modules may be respectively denoted as 1, 2, 3, …, and N, and accordingly, the numbers of two detection points of each battery module may be respectively 2N-1 and 2N, where N is the number of the current battery module, and N is 1, 2, 3, …, and N.
As shown in fig. 3, the method for detecting a fault of a battery pack according to an embodiment of the present invention specifically includes the following steps:
s101: the temperature data of each battery module in the power battery pack, such as a first temperature detection value and a second temperature detection value, are collected in real time.
S102: and processing the temperature data of each battery module, and judging whether the temperature difference between the first temperature detection value and the second temperature detection value in each battery module is greater than or equal to a first temperature threshold value or not.
Specifically, it is determined whether T (2n-1) -T (2n) ≥ 4 ℃ is satisfied for the battery module numbered n (n is the number of the battery module, and T (2n-1) and T (2n) are the numbers of two detection points of the battery module numbered n).
If yes, executing step S103; if not, step S104 is executed.
S103: it is determined that there is an electrical connection abnormality in the battery module n.
S104: and judging that the battery module n is normally electrically connected.
In addition, when the method is used for testing the battery pack EO L, whether the control of the electric connection process meets the requirements can be judged.
In summary, according to the method for detecting a fault of a battery pack provided by the embodiment of the invention, the connection state of the corresponding battery module is determined according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. Therefore, the temperature of two detection points on each module in the battery pack is monitored, the electric connection state of the battery pack is judged in advance, the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
Corresponding to the method for detecting the fault of the battery pack in the embodiment, the embodiment of the invention also provides a device for detecting the fault of the battery pack.
Fig. 4 is a block diagram illustrating a failure detection apparatus of a battery pack according to an embodiment of the present invention. As shown in fig. 4, the fault detection apparatus of the battery pack includes: a plurality of first temperature detection units 101, a plurality of second temperature detection units 102, and a processing unit 103.
The plurality of first temperature detection units 101 correspond to the plurality of battery modules respectively, and each first temperature detection unit in the plurality of first temperature detection units 101 is used for detecting the temperature of a first detection point of each battery module to obtain a first temperature detection value; the plurality of second temperature detection units 102 correspond to the plurality of battery modules respectively, and each of the plurality of second temperature detection units 102 is configured to detect a temperature of a second detection point of each battery module to obtain a second temperature detection value; the processing unit 103 is connected with the plurality of first temperature detection units 101 and the plurality of second temperature detection units 102, and the processing unit 103 is used for determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
According to one embodiment of the present invention, the processing unit 103 is further configured to determine whether a temperature difference between a first temperature detection value and a second temperature detection value of the battery module is greater than or equal to a first temperature threshold value, and determine that a connection abnormality occurs in the corresponding battery module when the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value.
According to one embodiment of the present invention, the first detection point is located in a high temperature region of the battery module, and the second detection point is located in a low temperature region of the battery module, wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
According to one embodiment of the invention, the first detection point is located in the middle area of the battery module, the second detection point is located in the peripheral area of the battery module, and the peripheral area is located at the periphery of the middle area.
It should be noted that the foregoing explanation of the embodiment of the method for detecting a fault of a battery pack is also applicable to the fault detection apparatus of the battery pack of this embodiment, and details are not repeated here.
According to the fault detection device of the battery pack provided by the embodiment of the invention, the connection state of the corresponding battery module is determined according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. Therefore, the temperature of two detection points on each module in the battery pack is monitored, the electric connection state of the battery pack is judged in advance, the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
In order to implement the above embodiments, an embodiment of the present invention further provides a vehicle including the failure detection apparatus for a battery pack of the foregoing embodiments.
According to the vehicle provided by the embodiment of the invention, the electric connection state of the battery pack is judged in advance by monitoring the temperature of two detection points on each module in the battery pack, so that the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be realized, the potential risk failure of the battery pack is identified in advance, the diagnosis is made in advance, the heat diffusion caused by loosening of the copper bar connecting bolt in the battery pack is avoided, and the safety of the whole vehicle is improved.
In order to implement the above-described embodiments, an embodiment of the present invention also proposes a computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the failure detection method of the battery pack of the foregoing embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A fault detection method for a battery pack, wherein the battery pack comprises a plurality of battery modules, the method comprising the steps of:
acquiring the temperature of a first detection point of each battery module to obtain a first temperature detection value;
acquiring the temperature of a second detection point of each battery module to obtain a second temperature detection value;
and determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
2. The method for detecting a failure of a battery pack according to claim 1, wherein the determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module includes:
judging whether the temperature difference between a first temperature detection value and a second temperature detection value of the battery module is greater than or equal to a first temperature threshold value or not;
and if the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value, determining that the corresponding battery module is abnormal in connection.
3. The method according to claim 1 or 2, wherein the first detection point is located in a low temperature region of the battery module, and the second detection point is located in a high temperature region of the battery module, and wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
4. The method according to claim 1 or 2, wherein the first detection point is located in a peripheral region of the battery module, the second detection point is located in a middle region of the battery module, and the peripheral region is located at a periphery of the middle region.
5. A failure detection device of a battery pack, characterized in that the battery pack includes a plurality of battery modules, the device includes:
the first temperature detection units respectively correspond to the battery modules, and each of the first temperature detection units is used for detecting the temperature of a first detection point of each battery module to obtain a first temperature detection value;
the plurality of second temperature detection units respectively correspond to the plurality of battery modules, and each of the plurality of second temperature detection units is used for detecting the temperature of a second detection point of each battery module to obtain a second temperature detection value;
and the processing unit is used for determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module.
6. The battery pack failure detection apparatus of claim 5, wherein the processing unit is further configured to,
and judging whether the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to a first temperature threshold value or not, and determining that the corresponding battery module is abnormal in connection when the temperature difference between the first temperature detection value and the second temperature detection value of the battery module is greater than or equal to the first temperature threshold value.
7. The apparatus for detecting a failure of a battery pack according to claim 5 or 6, wherein the first detection point is located in a low temperature region of the battery module, and the second detection point is located in a high temperature region of the battery module, and wherein heat gradually spreads from the high temperature region to the low temperature region during charging and discharging of the battery module.
8. The apparatus for detecting a failure of a battery pack according to claim 5 or 6, wherein the first detection point is located in a peripheral region of the battery module, the second detection point is located in a middle region of the battery module, and the peripheral region is located at a periphery of the middle region.
9. A vehicle characterized by comprising a failure detection device of a battery pack according to any one of claims 5 to 8.
10. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, implements the method of fault detection for a battery pack according to any one of claims 1 to 4.
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