CN210956888U - Battery pack convenient for acoustic detection - Google Patents
Battery pack convenient for acoustic detection Download PDFInfo
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- CN210956888U CN210956888U CN201921300481.2U CN201921300481U CN210956888U CN 210956888 U CN210956888 U CN 210956888U CN 201921300481 U CN201921300481 U CN 201921300481U CN 210956888 U CN210956888 U CN 210956888U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a conveniently carry out group battery of acoustics detection belongs to the lithium ion battery field, and this group battery is square hard shell lithium ion battery, is being provided with the carrier that is loading supersound coupling medium between shell and group battery lateral wall face to form the sound wave conduction route that supersound coupling medium found, thereby conveniently carry out the detection of acoustic transmission signal or acoustic reflection signal to the group battery. The utility model discloses there is the carrier of supersound coupling medium ingenious introduction in the group battery, conveniently carries out the acoustics and detects.
Description
Technical Field
The utility model belongs to the lithium ion battery field, more specifically relates to a conveniently carry out group battery of acoustics detection.
Background
Batteries are widely used in various fields of daily life, and the application and development of battery technology directly promote social progress and improvement of people's living standard. However, due to the limitation of materials and technologies, the capacity and voltage of the single battery are limited, and people connect the batteries in a series/parallel connection mode to form a battery pack to meet the requirement of large-scale electric energy storage, and the battery pack is applied to occasions such as electric vehicles and energy storage power stations.
In order to ensure the stable and safe operation of the battery pack and provide a suitable environment for the work of the battery pack, a battery management system is developed by people on the basis of the battery management system, the charging and discharging processes of the batteries in the battery pack are uniformly controlled, the batteries are prevented from being overcharged, overdischarged and overheated, and the health states of the batteries are monitored to realize the early warning of battery faults.
Accurate prediction of battery state of charge (SOC) and state of health (SOH) is its most important function for battery management systems. The SOC and the SOH are the core basis for battery management of the battery pack, in the full life cycle of the lithium battery, the error of SOC/SOH estimation not only directly affects the service performance and the service life of the lithium battery pack, but also serious safety accidents can be caused by misjudgment of the SOC/SOH.
However, the prediction of the SOC and the SOH is also the biggest difficulty of the battery management system, because the traditional prediction algorithms are based on the monitoring of the voltage and the current of the battery, the relation between the voltage of the battery and the SOC/SOH of the battery is a complex nonlinear relation, and is greatly influenced by the temperature and the current, and in addition, a relatively flat 'platform region' exists in the charging and discharging process of the battery, and the prediction precision based on the voltage and the current is also seriously influenced.
Currently, a latest ultrasound-based SOC/SOH prediction technology (ZL 201611037786.X) is available, which physically reveals the internal structural change of a battery by using the propagation characteristics of an ultrasonic wave, and if the technology is applied to a battery management system, the prediction accuracy of the battery management system on the SOC and the SOH of the battery can be greatly improved.
The ultrasonic technology described in the above patent requires that ultrasonic transducers be disposed on the front and rear surfaces of the battery so that ultrasonic signal detection signals pass through the battery perpendicularly. However, the battery pack as a highly integrated system has strict limitations on weight and volume, and there is often not enough space inside the battery pack to place the ultrasonic transducer necessary for the ultrasonic detection technology, which also conflicts with the original battery pack grouping process.
Therefore, the existing ultrasonic monitoring technology cannot be applied to an actual battery management system.
SUMMERY OF THE UTILITY MODEL
To the above defect or the improvement demand of prior art, the utility model provides a conveniently carry out acoustics and detect's group battery, its purpose in, ingenious introduction load has the carrier of supersound coupling medium on the group battery, conveniently carries out supersound or acoustics and detects, does not change the technology in groups of current battery moreover, has great using meaning in engineering reality.
In order to achieve the above object, the utility model provides a conveniently carry out ultrasonic testing's group battery, this group battery are square hard shell lithium ion battery, are provided with the carrier that is loading the supersound coupling medium between shell and group battery lateral wall face to form the sound wave conduction route that the supersound coupling medium found, this sound wave conduction route is on a parallel with the electrode slice direction that the inside electric core of group battery contained, thereby conveniently carry out the detection of acoustic transmission signal or acoustic reflection signal to the group battery.
The square hard-shell lithium ion battery is a professional term, has a rectangular shape, is internally provided with a multi-layer electrode plate structure, and is positioned on a plane vertical to the shortest side of a rectangular shell.
Further, the carrier loaded with the ultrasonic coupling medium is sponge. The sponge has the advantages of low price, easy acquisition, convenient processing and better capacity of loading the ultrasonic coupling medium.
Furthermore, the sponge loaded with the ultrasonic coupling medium is attached to the inner wall of the battery pack shell.
Further, the ultrasonic coupling medium is silicone oil or sylgard 184 two-component silica gel prepolymer of corning company. Wherein, sylgard 184 two-component silica gel prepolymer of corning company is a thermal fixing two-component silica gel which can be polymerized into a solid after being mixed with each other.
Furthermore, the sponge is in a strip shape, the width of the sponge is 1 cm-3 cm, the length direction of the strip is perpendicular to the direction of electrode plates contained in the battery cell in the battery pack, and the length of the strip-shaped sponge covers all single batteries in the battery pack. Or the sponges are in a disc shape, and the disc-shaped sponges are arranged in a string shape in a direction perpendicular to the electrode plate direction contained in the internal battery cell of the battery pack, so that an ultrasonic sound wave conduction channel constructed by the sponges is ensured to be arranged on each single battery cell.
A method for preparing the battery pack convenient for ultrasonic detection comprises the steps of arranging a carrier for loading an ultrasonic coupling medium on the inner wall of a shell, soaking the ultrasonic coupling medium on the carrier, and finally installing the battery pack in the shell.
The method for detecting the battery pack convenient for ultrasonic detection comprises the following steps of firstly, mounting a wafer-shaped ultrasonic transducer on the outer wall of a battery pack shell, wherein the ultrasonic transducer is made of piezoelectric ceramic materials and has ultrasonic transmitting and receiving functions, the mounting position is aligned to the area of a carrier loaded with an ultrasonic coupling medium, then, transmitting and receiving ultrasonic signals, collecting data, and analyzing the data to obtain an ultrasonic detection result; or
Firstly, a moving iron sound emitting element and an electret sound receiving element are mounted on the outer wall of a shell of a battery pack, the mounting positions are aligned to the area of a carrier loaded with an ultrasonic coupling medium, then, sound signal emission and reception are carried out, data are collected, and the data are analyzed to obtain acoustic characteristic detection; or
And only when the battery pack is overhauled, the external ultrasonic detector is aligned to the carrier region loaded with the ultrasonic coupling medium, and the battery pack is scanned and analyzed. Namely, the shell of the battery pack is not provided with an ultrasonic transmitting and receiving element, the battery is not monitored in time in normal use, but the sound propagation channel inside the battery pack still exists, and when the battery pack is overhauled, the external ultrasonic detector is used for scanning and analyzing the battery pack, so that the detection is needed at any time and is detected at any time, the detection is very convenient, and the battery pack is very popular in practical engineering due to the convenience.
In the above inventive concept, three possible detection modes are provided in total, which are all feasible in engineering application. The reason why the moving iron is selected as the sound emitting element is that it is small in size and small in driving current. The electret sound receiving element is chosen because of its small size and high sensitivity. The acoustic characteristics are mainly detected by using the components.
Further, a time domain integral value of a complex domain absolute value of a complex envelope of a signal obtained after the ultrasonic wave penetrates through the single battery in the signal duration is calculated, the time domain integral value is used as a characteristic value of the ultrasonic characteristic of the battery, and the battery state is judged by utilizing the relation between the characteristic value obtained through experiments and the battery state, so that an acoustic detection result is obtained.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
the utility model discloses in, the sponge layer of having absorbed the supersound coupling medium is added to the group battery side, compares in the positive insert probe of group battery at closely arranging, and is comparatively small to the change of current battery block structure, adds this sponge layer under the condition that the present most group battery homoenergetic can not change the project organization. The carrier (sponge layer) absorbing the ultrasonic coupling medium helps to construct an ultrasonic passage between the side surface of the battery and the battery pack shell, so that the ultrasonic transducer can be moved to the outside of the battery pack, and the ultrasonic transmission information of the side surface of the battery can be easily acquired from the outside. According to the research result, after the ultrasonic signals penetrating through the side face of the battery are processed, a reasonable result can be obtained, and the battery management system can be helped to predict the SOC/SOH of the battery more accurately.
Drawings
FIGS. 1a, 1b and 1c are oblique, top and front views, respectively, of a battery pack structure with a strip-shaped sponge mat;
FIGS. 2a, 2b and 2c are oblique, top and front views, respectively, of a battery pack structure with a circular foam pad;
fig. 3 is a diagram of the arrangement position and the acoustic path of the ultrasonic transducer in the embodiment of the present invention;
fig. 4 is a waveform diagram of an ultrasonic signal transmitted from the side in an embodiment of the present invention;
fig. 5 is a graph of the ultrasonic signal characteristic value Kn obtained in an embodiment of the present invention as a function of the battery power.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model discloses can't be applied to the problem in the actual battery management system to current supersound monitoring technology, a conveniently carry out ultrasonic testing's group battery has been designed, when not changing current battery group technology by a wide margin, be applied to the monitoring of battery state in the group battery with supersound monitoring system, utilize the group battery project organization that has the sponge layer, add the sponge layer that has adsorbed supersound coupling medium between square crust battery side and group battery shell, this sponge layer soaks has liquid or solid-state supersound coupling medium, make the ultrasonic wave can be from outside the group battery shell conduction to inside the battery, thereby make ultrasonic transducer need not to arrange the inside of group battery shell in.
The utility model provides a group battery is square hard shell lithium ion battery, is provided with the carrier that is loading supersound coupling medium between shell and group battery lateral wall face to form the sound wave conduction route that supersound coupling medium found, this sound wave conduction route is on a parallel with the electrode slice direction that the inside electric core of group battery contained, thereby conveniently carries out the detection of acoustic transmission signal or acoustic reflection signal to the group battery.
Specifically, the utility model discloses a sponge layer has among the square hard shell lithium ion battery, and the sponge layer is located in the middle of group battery shell inner wall and the battery, and the sponge layer is soaked by liquid before putting into the battery in the group battery, founds the sound wave conduction passageway between group battery shell and battery. The sponge has elasticity, and the soaked ultrasonic coupling medium can be well attached to the surface of the single battery. The porous structure of the sponge layer can localize the liquid in the area where ultrasonic transmission is desired. The sponge layer is attached to the inner wall of the battery pack shell before the battery is placed in the battery pack.
The utility model discloses well supersound coupling medium body of injecing can further polymerize, for example when using the prepolymer of saying that the kangning 184 glue as the supersound coupling medium body, after the group battery preparation finishes, place 48 hours at room temperature, this prepolymerization can become the solid by spontaneous polymerization. And a flame retardant which is not easy to volatilize and is flame-retardant, such as silicone oil, can also be used as the ultrasonic coupling medium body.
The sponge layer can be in various shapes: 1. the battery pack is in a strip shape, the width of the strip is 1-3 cm, and the strip covers all single cells in the battery pack in the length direction. 2. The battery pack is in a disc shape, and a plurality of disc-shaped sponge layers are arranged in the battery pack and are respectively contacted with each battery in the battery pack.
It is right the utility model discloses a group battery carries out supersound or acoustics and surveys time measuring, can paste dress ultrasonic transducer piece or installation ultrasonic probe at the outer wall of group battery shell. There is typically a large space between the battery enclosures that can house an ultrasound transducer for real-time in situ ultrasound monitoring.
The group battery also can not paste ultrasonic transducer at the outer wall, under this kind of condition, the detection of battery state does not pursue real-time supervision in the group battery, but regularly through using external supersound detection device, with ultrasonic probe aim at the region that the inner wall has the sponge layer, carry out ultrasonic signal transmission and receipt to follow-up analysis. The design omits an ultrasonic real-time monitoring system, and the ultrasonic real-time monitoring system is only used for constructing a sound path by soaking an ultrasonic coupling medium in a sponge layer, and can be possibly applied to the detection of the battery state of the electric automobile after the electric automobile is used for a period of time.
The utility model discloses it is minimum to the change of battery technology in groups, has only added the one deck sponge at group battery shell inner wall specific area to soak with liquid, hardly change the percentage of uniting of group battery (the percentage of uniting is, the quality of single battery before in groups and/behind in groups group battery). The gap between the battery pack shell and the single battery is filled with the ultrasonic coupling medium, so that ultrasonic waves can reach the inside of the single battery from the outside of the battery pack at a low attenuation rate, a transducer is not required to enter the inside of the battery pack to be in direct contact with the single battery, the structure is greatly simplified, and a road is paved for the large-scale application of an ultrasonic detection technology to battery state monitoring and detection.
In order to illustrate the battery pack, the method for manufacturing the battery pack, and the method for detecting the battery pack of the present invention in more detail, the following embodiments are further described.
Example 1: battery pack having strip-like sponge layer on one side
The battery pack structure as shown in fig. 1 of the specification, wherein fig. 1a, 1b and 1c are a perspective view, a plan view and a front view, respectively, of the battery pack structure with a strip-shaped sponge mat, and respective reference numerals are as follows: the ultrasonic signal sensor is 1, the battery series plate is 2, the battery pack shell is 3, the single battery is 4, and the strip-shaped sponge with the ultrasonic coupling medium is 5. The inside of the battery pack is provided with 7 square lithium ion battery cells with hard shells of 20AH (the size of each cell is 100x20x150mm, the length x the width x the height). The x, y, and z directions are defined as shown in the figure, the x direction is the battery lateral direction, the y direction is the battery thickness direction, and the z direction is the battery height direction. All the single batteries are stacked and arranged in the y direction, namely, the number of the single batteries is overlapped in the y direction. In order to achieve the effect of series connection, the directions of the positive electrode and the negative electrode of the battery in the x direction are changed alternately. And connecting the battery cores in series by using nickel sheets. The battery pack shell is made of polycarbonate plastic, a strip-shaped sponge layer which is arranged along the y direction is bonded at the position 40mm away from the bottom end in the shell, the width of the sponge layer is 20mm, the thickness of the sponge layer is 1mm, and the sponge layer is soaked by 184 silica gel prepolymer of Dow Corning company.
After the cell was placed in the battery housing, the sponge was compressed just slightly and a small amount of 184 silicone prepolymer was squeezed out of the sponge, but the area where the sponge and cell contacted was saturated with 184 silicone prepolymer. The 184 silica gel prepolymer polymerized to a solid 48 hours after the cell was placed in the battery. 7 ultrasonic transducer plates with the resonant frequency of 1MHz are pasted on the outer side of the battery pack shell, the diameter of each transducer plate is 12mm, the pasting position of the center of each transducer plate is aligned with the center height of the sponge strip in the z direction, and the pasting position of the center of each transducer plate is aligned with the middle position of each battery in the y direction. The energy conversion piece can transmit pulse ultrasonic signals transmitted along the x direction, reflected echo signals are detected for analysis, and whether each single battery in the battery pack has a bulging phenomenon or not is judged according to echo waveforms.
Example 2 Battery pack having sponge layer in disc shape on both sides
As shown in fig. 2 of the specification, fig. 2a, 2b and 2c are an oblique view, a plan view and a front view, respectively, of a battery pack structure with a circular sponge mat. The size and shape of the battery pack case and the arrangement of the internal batteries are the same as those of embodiment 1, two rows of circular flaky sponge layer arrays are attached to the inner sides of two parallel walls of the y-z plane of the battery pack case, each row of 7 sponge wafers is 14 in total, the diameter of each flaky sponge layer is 16mm, the thickness of each flaky sponge layer is 1mm, the center of each flaky sponge layer is 60mm away from the bottom of the battery pack in the z direction, and the sponge layer arrays are respectively aligned with the middle positions of the 7 batteries in the y direction. The sponge layer is soaked by silicone oil, and forms good contact with the battery through elasticity. 14 ultrasonic transduction pieces with the resonance frequency of 0.5MHz are adhered to the outer side of the battery pack shell, and the diameter of each transduction piece is 12mm and is smaller than that of the disc-shaped sponge. The transduction piece can emit pulse ultrasonic signals which are transmitted along the x direction, the signals can penetrate through the battery through the sponge layer soaked by the silicon oil and are detected by the transduction piece opposite to the other side, as shown in the attached figure 3 in the specification, and the figure 3 shows a schematic diagram of an ultrasonic signal transmission channel.
According to the research result, the waveform of the ultrasonic signal transmitted from the side surface is as shown in fig. 4 in the specification, because the battery is in a layered structure, different materials are different in different layers, and the ultrasonic sound velocity is different, the ultrasonic signals reaching the other side of the battery through different material layers arrive at different times, are separated on a time axis, and are shown that a plurality of sections of ultrasonic signals are received in a long time domain. The comprehensive performance of the battery is represented by the ultrasonic signal change of all materials.
Based on the detected ultrasound transmission signals, the resulting ultrasound signals can be processed by the following algorithm:
1. using Hilbert transform equations
And (3) obtaining a Hilbert function of the battery transmission signal, wherein the function comprises the following meanings of all parameters: pi is a circumferential rate, x (t) is a function of the change of the ultrasonic amplitude value along with time in a time domain, and tau is a mathematical transformation term;
2. taking the absolute value of imaginary part Im (Ht) of obtained Ht;
3. integrating the whole signal in the time domain for the duration T by the function obtained in the previous step does not change the integral into Kn,
and obtaining the ultrasonic characteristic value Kn of the battery, wherein the change of the characteristic value Kn reflects the comprehensive action result of the change of materials of all parts in the battery on the ultrasonic signal.
The relation curve of the battery ultrasonic signal characteristic value Kn and the battery electric quantity obtained by the experiment is shown in the attached figure 5 of the specification, and the SOC of the battery can be easily converted according to the ultrasonic characteristic value Kn of the battery at any time by means of the relation between the Kn and the battery electric quantity in the relation curve, so that the measurement of the SOC of the battery is realized.
Example 3 off-line testing method of Battery pack having strip-like sponge layer on one side
The battery pack having a strip-like sponge layer on one inner wall as described in example 1, on which the ultrasonic transducer sheet is not attached, is provided on the outer wall for cost reasons. The battery pack can sweep the battery shell along the direction of the strip-shaped sponge layer through the handheld ultrasonic detection equipment under the condition that the shell is not opened when the battery pack is overhauled offline, and the state of each battery in the battery pack is analyzed by utilizing echo waves.
The utility model discloses in still provide a preparation as above the convenient method of carrying out ultrasonic testing's group battery, set up the carrier that is used for loading the supersound coupling medium on the shell inner wall earlier, soak the supersound coupling medium on the carrier again, at last again in the shell installation group battery.
The utility model discloses in the method of detection like last battery group that provides, can also be as follows:
firstly, a moving iron sound emitting element and an electret sound receiving element are mounted on the outer wall of a shell of a battery pack, the mounting positions are aligned with the area of a carrier loaded with an ultrasonic coupling medium, then, sound signal emission and reception are carried out, data are collected, and the data are analyzed to obtain acoustic characteristic detection.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A battery pack convenient for acoustic detection is characterized in that the battery pack is a square hard-shell lithium ion battery, and a carrier loaded with an ultrasonic coupling medium is arranged between a shell and the side wall surface of the battery pack to form a sound wave conduction path constructed by the ultrasonic coupling medium, so that the battery pack can be conveniently detected by acoustic transmission signals or acoustic reflection signals.
2. A battery pack for facilitating acoustic testing as claimed in claim 1 wherein the carrier carrying the ultrasound coupling medium is a sponge.
3. The battery pack for facilitating acoustic testing as recited in claim 2, wherein the sponge loaded with the ultrasonic coupling medium is attached to an inner wall of the battery pack case.
4. The battery pack for facilitating acoustic testing according to claim 3, wherein the ultrasonic coupling medium is silicone oil or thermosetting two-component silica gel.
5. The battery pack for facilitating acoustic detection according to claim 4, wherein the sponge is in a strip shape, the width of the sponge is 1cm to 3cm, the length direction of the strip is perpendicular to the direction of electrode plates contained in the battery cells, and the length of the strip-shaped sponge covers all single cells in the battery pack.
6. The battery pack for facilitating acoustic detection according to claim 4, wherein the sponge is in a shape of a disk, and the disk-shaped sponges are arranged in a string shape perpendicular to the direction of electrode sheets contained in the internal cells of the battery pack, so as to ensure that each single cell has an ultrasonic sound wave conduction channel formed by the sponge.
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| CN201921300481.2U CN210956888U (en) | 2019-08-12 | 2019-08-12 | Battery pack convenient for acoustic detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110474086A (en) * | 2019-08-12 | 2019-11-19 | 江苏集萃华科智能装备科技有限公司 | Facilitate battery pack, preparation method and the detection method for carrying out Acoustic detection |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110474086A (en) * | 2019-08-12 | 2019-11-19 | 江苏集萃华科智能装备科技有限公司 | Facilitate battery pack, preparation method and the detection method for carrying out Acoustic detection |
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