CN111403836B - Battery pack temperature detection system and method - Google Patents
Battery pack temperature detection system and method Download PDFInfo
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- CN111403836B CN111403836B CN202010224917.5A CN202010224917A CN111403836B CN 111403836 B CN111403836 B CN 111403836B CN 202010224917 A CN202010224917 A CN 202010224917A CN 111403836 B CN111403836 B CN 111403836B
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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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- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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
Abstract
The temperature of a plurality of temperature points in the battery pack detected by a battery management system is combined with the infrared thermal imaging general map of all battery monomers in the battery pack, the temperature of the temperature points is taken as a reference temperature, and the temperature of each battery monomer in the battery pack is calculated on the infrared thermal imaging general map, so that the temperature of each battery monomer in the battery pack can be comprehensively acquired, early warning and control can be carried out on abnormal temperature in the battery pack in advance, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
Description
[ technical field ] A
The invention relates to the technical field of new energy, in particular to a battery pack temperature detection system and method.
[ background of the invention ]
The temperature of the power battery pack of the new energy electric automobile is detected by a battery management system at present, because the IO port resource of the battery management system is limited, the temperature of six single batteries nearby is generally represented by one temperature point, the temperature of each single battery and a connecting wire in the battery pack can not be comprehensively acquired, and therefore a temperature detection blind area is generated, the single batteries in the temperature blind area are in poor contact or the battery management system can not early warn and control in time due to the reason of the battery, and the risks of thermal runaway of the battery pack and vehicle combustion are caused.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a system and a method for detecting a temperature of a battery pack, where the temperatures of multiple temperature points in the battery pack detected by a battery management system are combined with an infrared thermal imaging total map of all battery cells in the battery pack, and the temperature of the temperature point is used as a reference temperature, and the temperature of each battery cell in the battery pack is calculated on the infrared thermal imaging total map, so that the temperature of each battery cell in the battery pack can be comprehensively acquired, early warning and control can be performed on temperature abnormality in the battery pack in advance, and a risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
In one aspect, an embodiment of the present invention provides a temperature detection system for a battery pack, where a plurality of battery cells are arranged in the battery pack, the plurality of battery cells include at least one reference battery cell, and the temperature detection system for the battery pack includes: a battery management system located within the battery pack enclosure and configured to obtain a first temperature dataset for a plurality of the reference cells; the infrared thermal imaging system is connected to the inner side face of the battery pack box body and is configured to acquire all the single battery infrared thermal imaging general diagrams in the battery pack, the first temperature data set is used as a reference temperature, and on the basis of the infrared thermal imaging general diagrams, all the single battery second temperature data sets in the battery pack are calculated and are used for reflecting whether the temperature of the single battery in the battery pack is abnormal or not.
In one embodiment of the present invention, the infrared thermal imaging system includes: the infrared thermal imaging module is configured to acquire an infrared thermal imaging general diagram of all the battery cells in the battery pack; and the calculation module is configured to calculate a second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermal imaging general map by taking the first temperature data set as a reference temperature.
In an embodiment of the present invention, a plurality of battery modules are disposed in the battery pack, each battery module includes at least two battery cells, and each of the at least two battery cells includes at least one reference battery cell; wherein the battery management system is configured to: acquiring first temperature data of at least one reference battery cell in each battery module; the first temperature data set includes the first temperature data of all the reference battery cells.
In an embodiment of the present invention, the calculation module includes: a reference temperature acquisition unit configured to acquire temperature data of a reference battery cell in one of the battery modules from the first temperature data set; the image intercepting unit is configured to intercept an infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image; and the calculating unit is configured to calculate a third temperature data set of all the single batteries in the battery module on the basis of the infrared thermal imaging sub-map by taking the temperature data of the reference single batteries in the battery module as a reference temperature, wherein the third temperature data set comprises the temperature data of all the single batteries in the battery module.
In an embodiment of the present invention, the plurality of battery modules includes a plurality of first battery modules and a plurality of second battery modules; the infrared thermal imaging module includes: the first infrared thermal imaging unit is connected to a first inner side face of the battery pack box and configured to acquire a first infrared thermal imaging general diagram of all battery monomers in the plurality of first battery modules; the second infrared thermal imaging unit is connected to a second inner side face of the battery pack box and configured to acquire a second infrared thermal imaging general diagram of all battery monomers in the second battery modules, wherein the first inner side face and the second inner side face are two oppositely arranged inner side faces of the battery pack box; a synthesizing unit configured to perform image synthesis on the first infrared thermal imaging general map and the second infrared thermal imaging general map to generate the infrared thermal imaging general map; and the synthesis unit sends the infrared thermal imaging general diagram to the calculation module.
In an embodiment of the present invention, the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules; the infrared thermal imaging module includes: the first infrared thermal imaging unit is connected to a first inner side face of the battery pack box body and configured to acquire a first infrared thermal imaging general diagram of all battery monomers in the plurality of first battery modules; the first infrared thermal imaging unit is connected to a first inner side face of the battery pack box body and configured to acquire a first infrared thermal imaging general diagram of all battery monomers in the first battery module;
the calculation module comprises: a first calculation module, configured to obtain a fourth temperature data set of all battery cells in the plurality of first battery modules in the first temperature data set, and calculate a fifth temperature data set of all battery cells in the plurality of first battery modules on the basis of the first infrared thermal imaging total map with the fourth temperature data set as a reference temperature; the second calculation module is configured to acquire a sixth temperature data set of all battery cells in the second battery modules in the first temperature data set, and calculate a seventh temperature data set of all battery cells in the second battery modules on the basis of the second infrared thermal imaging general diagram by taking the sixth temperature data set as a reference temperature; wherein the second temperature data set comprises the fifth temperature data set and the seventh temperature data set.
In another aspect, an embodiment of the present invention provides a method for detecting a temperature of a battery pack, where a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include at least one reference battery cell, and the method for detecting a temperature of a battery pack includes: acquiring a first temperature data set of at least one reference battery cell; acquiring an infrared thermal imaging general diagram of all the battery monomers in the battery pack; and calculating a second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermal imaging general diagram by taking the first temperature data set as a reference temperature, wherein the second temperature data set is used for reflecting whether the temperature of the battery cells in the battery pack is abnormal or not.
In an embodiment of the present invention, a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules; wherein, obtaining the infrared thermal imaging general picture of all the battery cells in the battery pack comprises: acquiring a first infrared thermal imaging general diagram of all battery monomers in the first battery modules; acquiring a second infrared thermal imaging general diagram of all battery monomers in the second battery modules; and carrying out image synthesis on the first infrared thermal imaging general diagram and the second infrared thermal imaging general diagram to generate the infrared thermal imaging general diagram.
In an embodiment of the present invention, a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules; wherein, obtaining the infrared thermal imaging general picture of a plurality of battery monomers in the battery pack comprises: acquiring a third infrared thermal imaging general diagram of all battery monomers in the first battery module; acquiring a fourth infrared thermal imaging general diagram of all the single batteries in the second battery modules; the calculating the second temperature data set of all the battery cells on the basis of the infrared thermal imaging general map by taking the first temperature data set as a reference temperature comprises: acquiring a fourth temperature data set of all battery monomers in the plurality of first battery modules in the first temperature data set, and calculating a fifth temperature data set of all battery monomers in the plurality of first battery modules on the basis of the third infrared thermal imaging general diagram by taking the fourth temperature data set as a reference temperature; acquiring a sixth temperature data set of all battery monomers in the plurality of second battery modules in the first temperature data set, and calculating a seventh temperature data set of all battery monomers in the plurality of second battery modules on the basis of the fourth infrared thermal imaging total graph by taking the sixth temperature data set as a reference temperature; wherein the second temperature data set includes the fifth temperature data set and the seventh temperature data set.
In an embodiment of the present invention, a plurality of battery modules are disposed in the battery pack, and each battery module includes at least two battery cells, where each of the at least two battery cells includes at least one reference battery cell; wherein calculating a second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermography overview map with the first temperature data set as a reference temperature comprises: acquiring temperature data of a reference battery cell in the battery module from the first temperature data set; intercepting an infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image; and calculating a third temperature data set of all the battery monomers in the battery module on the basis of the infrared thermal imaging sub-map by taking the temperature data of the reference battery monomers in the battery module as a reference temperature, wherein the third temperature data set comprises the temperature data of all the battery monomers in the battery module.
The temperature of a plurality of temperature points in the battery pack detected by a battery management system is combined with an infrared thermal imaging general map of all battery monomers in the battery pack, the temperature of the temperature points is taken as a reference temperature, and the temperature of each battery monomer in the battery pack is calculated on the infrared thermal imaging general map, so that the temperature of each battery monomer in the battery pack can be comprehensively acquired, early warning and control can be carried out on temperature abnormity in the battery pack in advance, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a battery pack according to the prior art;
fig. 2 is a schematic structural view of one battery module of fig. 1;
fig. 3 is a schematic structural view illustrating a battery pack temperature detection system according to an embodiment of the present invention applied to a battery pack;
fig. 4 is a schematic structural diagram of a battery pack temperature detection system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery module in a battery pack according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a battery pack temperature detection system according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a battery pack temperature detection system according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram illustrating a battery pack temperature detection system according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a battery pack temperature warning system according to an embodiment of the present invention;
fig. 10 is a schematic flow chart illustrating a method for detecting a temperature of a battery pack according to an embodiment of the invention;
fig. 11 is a schematic flow chart illustrating a method for detecting a temperature of a battery pack according to another embodiment of the invention;
fig. 12 is a schematic flow chart illustrating a method for detecting a temperature of a battery pack according to another embodiment of the present invention;
fig. 13 is a schematic flow chart illustrating a method for detecting a temperature of a battery pack according to another embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Fig. 1 is a schematic structural view of a battery pack in the prior art, and as shown in fig. 1, the battery pack includes a battery pack case 1 and a plurality of battery modules 2 disposed in the battery pack case, and two adjacent battery modules are connected by a wire; fig. 2 is a schematic structural view of each battery module 2, and referring to fig. 2, each battery module 2 includes a plurality of battery cells 21, and two adjacent battery cells 21 are connected by a lead. In the prior art, because the IO port resources of the battery management system 3 are limited, the temperature of the battery cells near the battery management system is usually represented by one temperature point, for example, as shown in fig. 2, one battery module 2 includes nine battery cells 21, the battery management system 3 usually represents the temperature of eight battery cells in the battery module 2 by two temperature points 22 in the battery module 2, and cannot comprehensively collect the temperature of each battery cell and a connecting wire in a battery pack, thereby generating a temperature detection blind zone, causing thermal runaway of the battery pack and risks of vehicle combustion due to poor contact of the battery cells in the temperature blind zone or failure of timely early warning and control of the battery management system due to the battery itself. Therefore, the temperature of a plurality of temperature points in the battery pack detected by a battery management system is combined with the infrared thermal imaging general diagram of all battery monomers in the battery pack, the temperature of the temperature points is taken as a reference temperature, and the temperature of each battery monomer in the battery pack is calculated on the basis of the infrared thermal imaging general diagram, so that the temperature of each battery monomer in the battery pack can be comprehensively acquired, early warning and control can be performed on temperature abnormality in the battery pack, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
Fig. 3 is a schematic view of an assembly structure of a battery pack temperature detection system applied to temperature detection of a battery pack according to an embodiment of the present invention, and as shown in fig. 3, the battery pack temperature detection system includes: a battery management system 3 and an infrared thermal imaging system 4, wherein the battery management system 3 and the infrared thermal imaging system 4 CAN be connected by a CAN bus to realize communication (e.g. data transfer or image transfer) between the battery management system 3 and the infrared thermal imaging system 4. The battery management system 3 is arranged in the battery pack, and the infrared thermal imaging system 4 is connected to the inner side wall of the battery pack box body 1. The battery pack is provided with a plurality of battery cells 21, at least one of the battery cells is a reference battery cell, and the battery management system 3 is configured to obtain a first temperature data set of the reference battery cells, that is, obtain a temperature T of each reference battery cellDatumThe temperatures of the plurality of reference cells constitute a first temperature data set.
The infrared thermal imaging system 4 is configured to obtain an infrared thermal imaging total map of all the battery cells 21 in the battery pack, and calculate a second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermal imaging total map by using the first temperature data set as a reference temperature, specifically, as shown in fig. 4, the infrared thermal imaging system 4 includes an infrared thermal imaging module 41 and a calculation module 42, where the infrared thermal imaging module 41 is configured to obtain the infrared thermal imaging total map of all the battery cells in the battery pack, and the calculation module 42 is configured to calculate the second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermal imaging total map by using the first temperature data set as a reference temperature. Specifically, the infrared thermal imaging module 41 obtains infrared temperature values of a reference battery cell and a plurality of battery cells located around the reference battery cell, and then obtains the infrared temperature value T of the reference battery cellInfrared rayAnd T of the reference battery cell detected by the battery management systemDatumTo calculate second temperature data of a plurality of battery cells located around the reference battery cell, the second temperature data of the plurality of battery cells constitutingAnd a second temperature data set, wherein the second temperature data set is used for reflecting whether the temperature of the battery cell 21 in the battery pack is abnormal or not, and when individual second temperature data in the second temperature data set is greater than other temperature data, the temperature of the battery cell 21 corresponding to the second temperature data is abnormal, so that an early warning can be made in advance according to the abnormal condition, and the thermal runaway of the battery pack is reduced.
According to the battery pack temperature detection system provided by the embodiment of the invention, the temperatures of a plurality of reference battery monomers in the battery pack detected by the battery management system are combined with the infrared thermal imaging total graph of all battery monomers in the battery pack, the temperature of the reference battery monomer is taken as the reference temperature, and the temperature of each battery monomer in the battery pack is calculated on the infrared thermal imaging total graph, so that the temperature of each battery monomer in the battery pack can be comprehensively acquired, early warning and control can be carried out on the temperature abnormality in the battery pack, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
When a plurality of battery cells are arranged in a battery pack, the distribution of reference battery cells in the plurality of battery cells is very important, for example, when N reference battery cells (N is an integer greater than or equal to two) are arranged in the battery pack, if the reference battery cells are arranged at the outermost position of the battery pack, the temperature of the battery cell farthest from the reference battery cell is likely to be inaccurate to calculate, which affects the accuracy of temperature detection of the battery cells in the whole battery pack. The battery management system 3 is further configured to obtain first temperature data of at least one reference battery cell in each battery module, where the first temperature data of the reference battery cells in the entire battery pack form a first temperature data set. Meanwhile, as shown in fig. 6, the calculation module 42 in the infrared thermal imaging system 4 further includes a reference temperature acquisition unit 421, an image interception unit 422, and a calculation unit 423; the reference temperature acquiring unit 421 is configured to acquire temperature data of all reference batteries in one battery module from the first temperature data set, the image intercepting module 422 is configured to intercept an infrared thermal imaging histogram corresponding to the battery module on the infrared thermal imaging total graph, and the calculating unit 423 is configured to calculate temperature data of all reference batteries in the battery module on the basis of the infrared thermal imaging histogram by taking the temperature data of the reference batteries in the battery module as a reference temperature. In the embodiment of the invention, one battery module is taken as a unit, each battery module comprises at least one reference battery cell, the temperature of the reference battery detected by the battery management system is taken as the reference temperature, and the actual temperature of all the battery cells in the battery module is calculated on the basis of the infrared thermal imaging sub-map of the battery module, so that the temperature of each battery in the battery pack can be quickly and accurately acquired.
Specifically, fig. 5 shows the distribution of battery cells of a battery module in a battery pack, where the battery module has eight battery cells in total, and the eight battery cells include two reference battery cells, where the eight battery cells are a first battery cell 211, a second battery cell 212, a third battery cell 213, a fourth battery cell 214, a fifth battery cell 215, a sixth battery cell 216, a first reference battery cell 221, and a second reference battery cell 222, respectively, and the first battery cell 211, the second battery cell 212, the third battery cell 213, and the fourth battery cell 214 are located around the first reference battery cell 221; fifth battery cell 215 and sixth battery cell 21
6 are located around the second reference cell 222; wherein the battery management system 3 detects that the reference temperature of the first reference battery cell 221 is T221-referenceThe reference temperature of the second reference battery cell 222 is T222-datumThe image capturing module 422 in the infrared thermal imaging system 4 is configured to capture the infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image, and obtain the infrared temperatures of the eight battery cells in the battery module 2 from the infrared thermal imaging sub-image of the battery module as T211-infra-red、T212-Infrared、T213-Infrared、T214-infrared、T215-infrared、T216-Infrared ray、T221 Infrared ray、T222-Infrared (IR)The infrared thermal imaging system detects the T of the first reference battery cell 221 according to the battery management system221-referenceAnd T of the first reference cell 221 detected by the thermal infrared imaging system221 Infrared rayLooking for T221-referenceAnd T221 Infrared rayAn arithmetic relationship between the two and based on the arithmetic relationship and T211-Infrared、T212-Infrared、T213-Infrared、T214-infraredThe temperatures T of the first, second, third, and fourth battery cells 211, 212, 213, and 214 are calculated. For example when T221-referenceAnd T221 Infrared rayThe arithmetic relation between the two is T221-reference-T221 Infrared rayThen the temperature T of the first battery cell 211211-T211-Infrared＝T221-reference-T221-Infrared, i.e. T211＝T221-reference-T221 Infrared ray+T211-Infrared. The temperature T of the first battery cell T211 can be calculated211. The algorithm of the temperatures of the second, third, and fourth battery cells 212, 213, and 214 is the same as the algorithm of the temperature of the first battery cell 211. Similarly, the temperature of the fifth battery cell 215 and the sixth battery cell 216 is determined according to T215-Infrared ray、T216-Infrared ray、T222-Infrared ray、T222-datumCalculated, method of calculating and according to T211-Infrared、T221-reference、T221 Infrared rayCalculating T211The same method is not described herein again. Similarly, the temperature of all the battery cells in the other battery modules in the battery pack is calculated in the same way as the temperature of all the battery cells in the battery module.
It should be understood that T of the first reference cell 221221-reference、T221 Infrared rayThe arithmetic relationship between the first and second reference cells 221 may be any reasonable arithmetic relationship, not limited to the above-mentioned "difference" arithmetic relationship, as long as the calculated temperature of the first reference cell 221 is relatively accurate221-reference、T221 Infrared rayThe mathematical relationship between them is not limited to the relationship of "difference".
In addition, as shown in fig. 5, since there are two reference battery cells in the cut-out region and the fourth battery cell 214 is at the same distance from the first reference battery cell 221 and the second reference battery cell 222, the temperature T of the fourth battery cell 214 is calculated214In this case, the first reference battery cell 221 may be used as a reference, the second reference battery cell 222 may be used as a reference, or the first reference battery cell 221 and the second reference battery cell 222 may be used as references at the same time to calculate two temperature values, and the value obtained by averaging the two temperature values is T of the fourth battery cell 214214. Therefore, if the distance between one battery cell and two reference battery cells is very small, the temperature of the battery cell may be calculated based on any one of the two reference battery cells, and may also be calculated based on the temperatures of the two reference battery cells at the same time.
Whether the temperatures of all the battery cells in the battery module reflected in the infrared thermal imaging sub-map of the battery module in the battery pack are accurate or not has a great relationship with the position of the infrared thermal imaging system in the battery pack, for example, when the infrared thermal imaging system is arranged on the left side wall in the battery pack, the accuracy of the infrared temperatures of the battery module reflected in the infrared thermal imaging sub-map of the battery module on the right side in the battery pack is lower, so in an embodiment of the present invention, referring to fig. 3 and 7, the plurality of battery modules are divided into a plurality of first battery modules (i.e., two battery modules 2 on the left in fig. 3) and a plurality of second battery modules (i.e., two battery modules 2 on the right in fig. 3); the infrared thermal imaging module includes: the first infrared thermal imaging unit 411 is connected to the first inner side surface of the battery pack case 1 and configured to obtain a first infrared thermal imaging general diagram of all battery cells in the plurality of first battery modules; a second infrared thermal imaging unit 412 connected to a second inner side surface of the battery pack case, configured to obtain a second infrared thermal imaging total map of all battery cells in the plurality of second battery modules, where the first inner side surface and the second inner side surface are two inner side surfaces of the battery pack case that are arranged oppositely; a synthesizing unit 413 configured to perform image synthesis on the first infrared thermal imaging total map and the second infrared thermal imaging total map to generate the infrared thermal imaging total map; wherein, the synthesis unit 413 sends the infrared thermal imaging general map to the calculation module 42. In the embodiment of the invention, different infrared thermal imaging modules are respectively adopted to shoot the battery modules positioned at two sides in the battery pack box body, the two images acquired by the two infrared thermal imaging modules are synthesized, and the synthesized infrared thermal imaging image is the infrared thermal imaging general image.
When obtaining two infrared thermal imaging graphs, when the calculating module 42 calculates the temperatures of all the battery cells in the battery pack, the calculation may be performed based on one graph (that is, the two infrared thermal imaging graphs are combined into one graph) or may be performed by separately calculating two infrared thermal imaging graphs, so that, in another embodiment of the present invention, as shown in fig. 8, the infrared thermal imaging modules of the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules, including: the first infrared thermal imaging unit 411 is connected to the first inner side surface of the battery pack box and configured to obtain a first infrared thermal imaging general diagram of all battery cells in the plurality of first battery modules; the second infrared thermal imaging unit 412 is connected to a second inner side surface of the battery pack box and configured to obtain a second infrared thermal imaging total map of all battery cells in the plurality of second battery modules, wherein the first inner side surface and the second inner side surface are two inner side surfaces of the battery pack box which are arranged oppositely; the calculation module 42 includes: the first calculating module 426 is configured to obtain a fourth temperature data set of all the battery cells in the plurality of first battery modules in the first temperature data set, and calculate a fifth temperature data set of all the battery cells in the plurality of first battery modules on the basis of the first infrared thermal imaging total map by using the fourth temperature data set as a reference temperature; the second calculation module 425 is configured to acquire a sixth temperature data set of all the battery cells in the plurality of second battery modules in the first temperature data set, and calculate a seventh temperature data set of all the battery cells in the plurality of second battery modules on the basis of the second infrared thermal imaging general diagram by using the sixth temperature data set as a reference temperature; wherein the second temperature data set comprises a fifth temperature data set and a seventh temperature data set.
As another aspect of the invention, an embodiment of the invention further provides a battery pack temperature early warning system, which includes an infrared thermal imaging system 4, a battery management system 3, a vehicle control unit 6 and a central control large screen 5, wherein the infrared thermal imaging system 4, the battery management system 3, the vehicle control unit 6 and the central control large screen 5 are connected in series through a CAN bus, the battery management system 3 is arranged in the battery pack, and the infrared thermal imaging system 4 is connected to the inner side wall of a battery pack box body 1. The battery pack is provided with a plurality of battery cells, at least one of the battery cells is a reference battery cell, the battery management system 3 is configured to obtain a first temperature data set of the reference battery cells, that is, to obtain a temperature T-reference of each reference battery cell, and the temperatures of the reference battery cells form the first temperature data set. An infrared thermal imaging system 4 configured to acquire an infrared thermal imaging total map of all the battery cells 21 in the battery pack, and to take the first temperature data set as a reference temperature, calculating a second temperature data set of all battery cells in the battery pack on the basis of the infrared thermal imaging general diagram, after the infrared thermal imaging system calculates a second temperature data set for all of the cells in the battery pack, the second temperature data set is communicated to a battery management system, which, based on the second temperature data set, and further analyzes the battery monomer in the battery pack by combining the current and the voltage of the battery monomer detected by the battery management system and the environmental temperature in the battery pack, meanwhile, the infrared thermal imaging system 4 can also transmit the calculated second temperature data set to the vehicle controller or the central control large screen to realize safety control and human-computer interaction temperature image or diagnosis under various working conditions of vehicle operation.
According to the battery pack temperature early warning system provided by the embodiment of the invention, the temperatures of a plurality of temperature points in the battery pack detected by the battery management system are combined with the infrared thermal imaging total map of all battery monomers in the battery pack, the temperatures of the temperature points are taken as reference temperatures, and the temperature of each battery monomer in the battery pack is calculated on the infrared thermal imaging total map, so that the temperature of each battery monomer in the battery pack can be comprehensively acquired, early warning and control can be carried out on temperature abnormity in the battery pack in advance, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
It should be understood how to combine the infrared thermal imaging system 4 and the battery management system 3 specifically to obtain the temperature of each battery cell in the battery pack, as described above, and therefore no further description is given here.
On the other hand, fig. 10 shows a method for detecting a temperature of a battery pack according to an embodiment of the present invention, wherein a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include at least one reference battery cell; as shown in fig. 10, the battery pack temperature detection method includes the steps of:
step S101: acquiring a first temperature data set of at least one reference battery cell;
step S102: acquiring an infrared thermal imaging general diagram of all battery monomers in the battery pack; and
step S103: and calculating second temperature data sets of all the battery cells in the battery pack on the basis of the infrared thermal imaging general diagram by taking the first temperature data set as a reference temperature.
The second temperature data set is used for reflecting whether the temperature of the battery monomer 21 in the battery pack is abnormal or not, and when individual second temperature data in the second temperature data set is greater than other temperature data, the temperature of the battery monomer 21 corresponding to the second temperature data is abnormal, early warning can be made in advance according to abnormal conditions, and thermal runaway of the battery pack is reduced.
According to the battery pack temperature detection method provided by the embodiment of the invention, the temperatures of a plurality of reference battery monomers in the battery pack are combined with the infrared thermal imaging general diagram of all battery monomers in the battery pack, the temperature of a temperature point is taken as the reference temperature, and the temperature of each battery monomer in the battery pack is calculated on the infrared thermal imaging general diagram, so that the temperature of each battery monomer in the battery pack can be comprehensively collected, early warning and control can be carried out on temperature abnormality in the battery pack in advance, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.
When a plurality of battery cells are arranged in a battery pack, the distribution of reference battery cells in the plurality of battery cells is very important, for example, when N reference battery cells (N is an integer greater than or equal to two) are arranged in the battery pack, if the reference battery cells are arranged at the outermost position of the battery pack, the temperature of the battery cell farthest from the reference battery cell is likely to be inaccurate to calculate, which affects the accuracy of temperature detection of the battery cells in the entire battery pack. As shown in fig. 11, wherein step S103 further comprises:
step S1031: acquiring temperature data of a reference battery monomer in a battery module from the first temperature data set;
step S1032: intercepting an infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image; and
step S1033: and calculating a third temperature data set of all the battery monomers in the battery module on the basis of the infrared thermal imaging mapping by taking the temperature data of the reference battery monomers in the battery module as reference temperature, wherein the third temperature data set comprises the temperature data of all the battery monomers in the battery module.
Specifically, fig. 5 shows the distribution of battery cells of a battery module in a battery pack, where the battery module has eight battery cells in total, and the eight battery cells include two reference battery cells, which are respectively a first battery cell 211, a second battery cell 212, a third battery cell 213, a fourth battery cell 214, a fifth battery cell 215, a sixth battery cell 216, a first reference battery cell 221, and a second reference battery cell 222, where the first battery cell 211, the second battery cell 212, the third battery cell 213, and the fourth battery cell 214 are located around the first reference battery cell 221; the fifth battery cell 215 and the sixth battery cell 216 are located around the second reference battery cell 222; the battery management system 3 detects that the reference temperature of the first reference battery cell 221 is T221-reference, the reference temperature of the second reference battery cell 222 is T222-reference, the infrared thermal imaging system detects that the infrared temperatures of the eight battery cells are T211-infrared, T212-infrared, T213-infrared, T214-infrared, T215-infrared, T216-infrared, T221-infrared and T222-infrared respectively, the infrared thermal imaging system searches an arithmetic relation between the T221-reference and the T221-infrared according to the T221-reference of the first reference battery cell 221 detected by the battery management system and the T221-infrared of the first reference battery cell 221 detected by the thermal infrared imaging system, and finds an arithmetic relation between the T221-reference and the T221-infrared according to the arithmetic relation and the T211-infrared, the T212-infrared, the T213-infrared, T214-infrared calculation of the temperature T of the first battery cell 211, the second battery cell 212, the third battery cell 213, and the fourth battery cell 214. For example, when the mathematical relationship between T221 reference and T221 infrared is T221 reference T221 infrared, the temperature T211-T211 infrared of the first cell 211 is T221 reference T221 infrared, i.e., T211 infrared + T211 infrared. The temperature T211 of the first battery cell T211 can be calculated. The algorithm of the temperatures of the second, third, and fourth battery cells 212, 213, and 214 is the same as the algorithm of the temperature of the first battery cell 211. Similarly, the temperatures of the fifth battery cell 215 and the sixth battery cell 216 are calculated according to T215-infrared, T216-infrared, T222-infrared, and T222-reference, and the calculation method is the same as the method for calculating T211 according to T211-infrared, T221-reference, and T221-infrared, and is not described herein again.
It should be understood that T of the first reference cell 221221-reference、T221-InfraredThe mathematical relationship between the two can be any reasonable mathematical relationship, and is not limited to the above-mentioned "difference" mathematical relationshipIn this relation, T of the first reference cell 221 is set to be relatively accurate as long as the calculated temperature of the cell can be relatively accurate221-reference、T221-InfraredThe mathematical relationship between them is not limited to the relationship of "difference".
According to the embodiment of the invention, one battery module is taken as a unit, each battery module comprises at least one reference battery monomer, the temperature of the reference battery monomer detected by the battery management system is taken as a reference temperature, and the actual temperature of all the battery monomers in the battery module is calculated on the basis of the infrared thermal imaging sub-map of the battery module, so that the temperature of each battery in the battery pack can be rapidly and accurately obtained.
Whether the temperatures of all the battery cells in the battery module reflected in the infrared thermal imaging sub-map of the battery module in the battery pack are accurate or not has a great relationship with the position of the infrared thermal imaging system in the battery pack, for example, when the infrared thermal imaging system is arranged on the left side wall in the battery pack, the accuracy of the infrared temperatures of the battery module reflected in the infrared thermal imaging sub-map of the battery module on the right side in the battery pack is lower, so in an embodiment of the present invention, referring to fig. 3 and 7, the plurality of battery modules are divided into a plurality of first battery modules (i.e., two battery modules 2 on the left in fig. 3) and a plurality of second battery modules (i.e., two battery modules 2 on the right in fig. 3); at this time, as shown in fig. 12, step S102 specifically includes the following steps:
step S1021: acquiring a first infrared thermal imaging general diagram of all battery monomers in a plurality of first battery modules;
step S1022: acquiring second infrared thermal imaging general diagrams of all battery monomers in a plurality of second battery modules; and
step S1023: and carrying out image synthesis on the first infrared thermal imaging general diagram and the second infrared thermal imaging general diagram to generate an infrared thermal imaging general diagram.
In the embodiment of the invention, different infrared thermal imaging modules are respectively adopted to shoot the battery modules positioned at two sides in the battery pack box body, the two images acquired by the two infrared thermal imaging modules are synthesized, and the synthesized infrared thermal imaging image is the infrared thermal imaging general image.
After acquiring the two infrared thermal imaging maps, that is, after step S1021 and step S1022, not only the above-mentioned step S1023 may be performed to combine the two sub-maps into a total map, and then the step S103 is continued, but also two infrared thermal imaging maps may be respectively used to perform respective calculations, as shown in fig. 13, that is, step S102 specifically includes:
step S1021: acquiring a third infrared thermal imaging general diagram of all battery monomers in the plurality of first battery modules; and
step S1022: acquiring fourth infrared thermal imaging general diagrams of all battery monomers in the plurality of second battery modules;
step S103 specifically includes:
step S1031, acquiring fourth temperature data sets of all battery monomers in the plurality of first battery modules in the first temperature data sets, and calculating fifth temperature data sets of all battery monomers in the plurality of first battery modules on the basis of a third infrared thermal imaging general diagram by taking the fourth temperature data sets as reference temperatures; and
step S1032, acquiring a sixth temperature data set of all the battery monomers in the plurality of second battery modules in the first temperature data set, and calculating a seventh temperature data set of all the battery monomers in the plurality of second battery modules on the basis of a fourth infrared thermal imaging general diagram by taking the sixth temperature data set as a reference temperature;
wherein the second temperature data set comprises the fifth temperature data set and the seventh temperature data set.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a battery package temperature detecting system, be equipped with a plurality of battery monomer in the battery package, including at least one benchmark battery monomer in a plurality of battery monomer, its characterized in that, battery package temperature detecting system includes:
the battery management system is positioned in the battery pack box body and configured to acquire a first temperature data set of a plurality of reference single batteries;
the infrared thermal imaging system is connected to the inner side face of the battery pack box body and is configured to acquire all the battery monomer infrared thermal imaging general diagrams in the battery pack, the first temperature data set is used as a reference temperature, and on the basis of the infrared thermal imaging general diagrams, all the battery monomer second temperature data sets in the battery pack are calculated and used for reflecting whether the battery monomer temperature in the battery pack is abnormal or not.
2. The battery pack temperature detection system of claim 1, wherein the infrared thermal imaging system comprises:
the infrared thermal imaging module is configured to acquire an infrared thermal imaging general diagram of all the battery cells in the battery pack; and
and the calculation module is configured to calculate second temperature data sets of all the battery cells in the battery pack on the basis of the infrared thermal imaging general map by taking the first temperature data set as a reference temperature.
3. The system for detecting the temperature of the battery pack according to claim 2, wherein a plurality of battery modules are disposed in the battery pack, each battery module includes at least two battery cells, and each battery cell includes at least one reference battery cell;
wherein the battery management system is configured to: acquiring first temperature data of at least one reference battery cell in each battery module;
the first temperature data set includes the first temperature data of all the reference battery cells.
4. The battery pack temperature detection system of claim 3, wherein the calculation module comprises:
a reference temperature acquisition unit configured to acquire temperature data of a reference battery cell in one of the battery modules from the first temperature data set;
the image intercepting unit is configured to intercept an infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image; and
the calculation unit is configured to calculate a third temperature data set of all the single batteries in the battery module on the basis of the infrared thermal imaging histogram by taking the temperature data of the single batteries in the battery module as a reference temperature, wherein the third temperature data set comprises the temperature data of all the single batteries in the battery module.
5. The battery pack temperature detection system according to claim 3, wherein the plurality of battery modules includes a plurality of first battery modules and a plurality of second battery modules;
the infrared thermal imaging module includes:
the first infrared thermal imaging unit is connected to a first inner side face of the battery pack box body and configured to acquire a first infrared thermal imaging general diagram of all battery monomers in the plurality of first battery modules;
the second infrared thermal imaging unit is connected to a second inner side face of the battery pack box and configured to acquire a second infrared thermal imaging general diagram of all battery monomers in the second battery modules, wherein the first inner side face and the second inner side face are two oppositely arranged inner side faces of the battery pack box;
a synthesizing unit configured to perform image synthesis on the first infrared thermal imaging general map and the second infrared thermal imaging general map to generate the infrared thermal imaging general map;
and the synthesis unit sends the infrared thermal imaging general diagram to the calculation module.
6. The battery pack temperature detection system according to claim 3, wherein the plurality of battery modules includes a plurality of first battery modules and a plurality of second battery modules;
the infrared thermal imaging module includes:
the first infrared thermal imaging unit is connected to a first inner side face of the battery pack box and configured to acquire a first infrared thermal imaging general diagram of all battery monomers in the plurality of first battery modules; and
the second infrared thermal imaging unit is connected to a second inner side surface of the battery pack box body and configured to acquire a second infrared thermal imaging general diagram of all battery monomers in the plurality of second battery modules, wherein the first inner side surface and the second inner side surface are two inner side surfaces of the battery pack box body, which are arranged oppositely;
the calculation module comprises:
a first calculation module, configured to obtain a fourth temperature data set of all battery cells in the plurality of first battery modules in the first temperature data set, and calculate a fifth temperature data set of all battery cells in the plurality of first battery modules on the basis of the first infrared thermal imaging total map with the fourth temperature data set as a reference temperature; and
a second calculation module, configured to obtain a sixth temperature data set of all battery cells in the plurality of second battery modules in the first temperature data set, and calculate a seventh temperature data set of all battery cells in the plurality of second battery modules on the basis of the second infrared thermal imaging total map with the sixth temperature data set as a reference temperature;
wherein the second temperature data set comprises the fifth temperature data set and the seventh temperature data set.
7. The utility model provides a battery package temperature detecting method, be equipped with a plurality of battery single module in the battery package, a plurality of battery single module include at least one benchmark battery monomer, its characterized in that, battery package temperature detecting method includes:
acquiring a first temperature data set of at least one reference battery cell;
acquiring an infrared thermal imaging general diagram of all the battery monomers in the battery pack; and
and calculating a second temperature data set of all the single batteries in the battery pack on the basis of the infrared thermal imaging general diagram by taking the first temperature data set as a reference temperature, wherein the second temperature data set is used for reflecting whether the temperature of the single batteries in the battery pack is abnormal or not.
8. The method for detecting the temperature of the battery pack according to claim 7, wherein a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules;
wherein, obtaining the infrared thermal imaging general diagram of all the battery cells in the battery pack comprises:
acquiring a first infrared thermal imaging general diagram of all battery monomers in the first battery modules;
acquiring a second infrared thermal imaging general diagram of all battery monomers in the second battery modules; and
and carrying out image synthesis on the first infrared thermal imaging general diagram and the second infrared thermal imaging general diagram to generate the infrared thermal imaging general diagram.
9. The method for detecting the temperature of the battery pack according to claim 7, wherein a plurality of battery modules are disposed in the battery pack, and the plurality of battery modules include a plurality of first battery modules and a plurality of second battery modules;
wherein, obtaining the infrared thermal imaging general picture of a plurality of battery monomers in the battery pack comprises:
acquiring a third infrared thermal imaging general diagram of all battery monomers in the first battery module; and
acquiring a fourth infrared thermal imaging general diagram of all battery monomers in the second battery modules;
the calculating a second temperature data set of all the battery cells on the basis of the infrared thermal imaging total map by using the first temperature data set as a reference temperature includes:
acquiring a fourth temperature data set of all the single batteries in the plurality of first battery modules in the first temperature data set, and calculating a fifth temperature data set of all the single batteries in the plurality of first battery modules on the basis of the third infrared thermal imaging total graph by taking the fourth temperature data set as a reference temperature; and
acquiring a sixth temperature data set of all battery cells in the plurality of second battery modules in the first temperature data set, and calculating a seventh temperature data set of all battery cells in the plurality of second battery modules on the basis of the fourth infrared thermal imaging general diagram by taking the sixth temperature data set as a reference temperature;
wherein the second temperature data set comprises the fifth temperature data set and the seventh temperature data set.
10. The method for detecting the temperature of the battery pack according to claim 7, wherein a plurality of battery modules are arranged in the battery pack, each battery module comprises at least two battery cells, and each battery cell comprises at least one reference battery cell;
wherein calculating a second temperature data set of all the battery cells in the battery pack on the basis of the infrared thermography overview map with the first temperature data set as a reference temperature comprises:
acquiring temperature data of a reference battery cell in the battery module from the first temperature data set;
intercepting an infrared thermal imaging sub-image corresponding to the battery module on the infrared thermal imaging general image; and
and calculating a third temperature data set of all the battery monomers in the battery module on the basis of the infrared thermal imaging sub-map by taking the temperature data of the reference battery monomers in the battery module as reference temperature, wherein the third temperature data set comprises the temperature data of all the battery monomers in the battery module.
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