CN117393960B - Lithium battery FPC signal acquisition device and method - Google Patents
Lithium battery FPC signal acquisition device and method Download PDFInfo
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- CN117393960B CN117393960B CN202311689253.XA CN202311689253A CN117393960B CN 117393960 B CN117393960 B CN 117393960B CN 202311689253 A CN202311689253 A CN 202311689253A CN 117393960 B CN117393960 B CN 117393960B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 338
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 167
- 238000003466 welding Methods 0.000 claims abstract description 65
- 229910000679 solder Inorganic materials 0.000 claims description 26
- 239000012790 adhesive layer Substances 0.000 claims description 13
- 230000003139 buffering effect Effects 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 4
- 238000000608 laser ablation Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000741 silica gel Substances 0.000 description 7
- 229910002027 silica gel Inorganic materials 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
Classifications
-
- 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
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/519—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
- H05K1/0281—Reinforcement details thereof
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/0283—Stretchable printed circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The application provides a lithium battery FPC signal acquisition device and a method. The lithium battery FPC signal acquisition device comprises: the signal acquisition circuit is arranged on the FPC body and the FPC bulge in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge and the FPC body; the acquisition nickel sheet is connected with the signal acquisition circuit, the acquisition nickel sheet comprises a battery connection end, the acquisition nickel sheet is fixedly connected with a conductive bar of the battery module through the battery connection end, the acquisition nickel sheet acquires an acquisition signal from the conductive bar, and the acquisition signal is sent to the FPC chip through the acquisition circuit; the first buffer structure and the second buffer structure buffer the external pulling force of the collected nickel sheet in the first direction. The acquisition device has better welding spot connection stability and welding spot connection strength, equipment operation of the signal acquisition system is more stable under a complex environment, and service life is longer.
Description
Technical Field
The invention relates to a lithium battery FPC signal acquisition device and method, and belongs to the technical field of lithium battery FPC signal acquisition.
Background
In the energy storage battery and the new energy vehicle battery, the signal acquisition device is one of important components of a battery signal detection system and mainly comprises the acquisition of voltage signals and temperature signals. With the gradual maturity of flexible circuit board (Flexible Printed Circuit) FPC technique, the signal acquisition field of battery module is used more and more.
In the existing FPC battery module signal acquisition device, a plurality of signal acquisition ends are integrated on one FPC body, and each battery module in the battery module is connected in a one-to-one correspondence manner through the plurality of signal acquisition ends, so that a highly integrated battery module and a battery module signal detection system are formed.
Unlike the traditional battery signal acquisition device of the PCBA board, the FPC signal acquisition device is usually arranged on the same FPC body through circuit integration of the signal acquisition ends and the FPC body, namely, the signal acquisition ends are formed through primary circuit printing, and each signal acquisition end is not required to be connected through flexible connection structures such as wires, so that the whole manufacturing cost of the device is lower, but certain using problems are caused, for example, when the FPC signal acquisition device is arranged in a battery module, the plurality of signal acquisition ends of the FPC are respectively fixedly connected with conductive bars (or called aluminum bars and aluminum bars) of the battery module, during equipment installation, the connection stability between the FPC and the conductive bars is sufficiently supported due to the arrangement of the whole precision, and therefore, the installation and the use of the FPC are not problematic, but under the working state of the battery module, particularly under the high-temperature environment, the battery module is deformed to a certain extent due to the fact that the temperature rise is caused, the conductive bars can be connected with the acquisition welding spots of the FPC in different directions, due to the fact that the acquisition nickel pieces are high in strength and have certain deformation elasticity, the acquisition nickel pieces are not easy to damage, but the acquisition nickel pieces are difficult to the fact that the acquisition nickel pieces are respectively connected with conductive bars (or called aluminum bars and aluminum bars) in a conductive manner, and the technical problem that the acquisition circuit is difficult to be repeatedly arranged in the design when the two-direction is high in the environment, and the acquisition of the current is required to be broken, and the problem is solved when the problem of the acquisition of the signal acquisition device is solved is due to the fact that the high-strength of the current connection of the FPC is due to the fact that the current is in the emergency circuit is in the high-temperature and the current connection of the current.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a lithium battery FPC signal acquisition device and method.
According to an embodiment of the present invention, there is provided a first aspect of: a lithium battery FPC signal acquisition device, comprising:
the signal acquisition circuit is arranged on the FPC body and the FPC bulge in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge and the FPC body;
the acquisition nickel plate is connected with the signal acquisition circuit and comprises a battery connecting end, the acquisition nickel plate is fixedly connected with a conductive bar of the battery module through the battery connecting end, the acquisition nickel plate acquires an acquisition signal from the conductive bar, and the acquisition signal is sent to the FPC chip through the acquisition circuit;
the nickel sheet collecting device comprises a nickel sheet collecting device, wherein the nickel sheet collecting device comprises a nickel sheet collecting device, a nickel sheet collecting device and a nickel sheet collecting device, wherein the nickel sheet collecting device comprises a first buffering structure and a second buffering structure, the first buffering structure is used for buffering the external tensile force of the nickel sheet collecting device in the first direction, and the long side direction of the nickel sheet collecting device is consistent with the long side direction of the nickel sheet collecting device.
Further, the signal acquisition circuit comprises a voltage signal acquisition circuit and a temperature signal acquisition circuit;
the voltage signal acquisition circuit comprises a connection area, wherein the connection area is an end circuit printed on the protrusion of the FPC, and the voltage signal acquisition circuit is connected with an acquisition nickel plate in a welding way through the connection area;
the temperature signal acquisition circuit comprises an NTC positive circuit, an NTC negative circuit, an NTC sensor and an adhesive layer, wherein the NTC sensor is arranged on the FPC boss and is fixedly connected with the acquisition nickel sheet through the adhesive layer;
when external tension acts on the collected nickel sheet, two points of force are voltage welding spots between the collected nickel sheet and the connecting area and collecting welding spots between the collected nickel sheet and the conducting bars.
Further, gather nickel piece includes voltage fixed part and temperature fixed part, voltage signal acquisition circuit passes through the connection district and gathers the voltage fixed part welded connection of nickel piece, NTC sensor passes through adhesive linkage and gathers the temperature fixed part fixed connection of nickel piece, temperature fixed part sets up in the other end of gathering the battery link of nickel piece, voltage fixed part is located to gather nickel piece middle part and is close to temperature fixed part one side.
Further, the first buffer structure includes: the torsion arm part is arranged between the FPC bulge and the FPC body and comprises a first concave part and a second concave part, and the first concave part and the second concave part are oppositely arranged along a first direction.
Further, the second buffer structure includes: the long side direction of the strip-shaped hole is consistent with the first direction.
Further, the second buffer structure further includes: the third concave part and the fourth concave part are arranged on two sides of the collected nickel sheet, the third concave part and the fourth concave part are oppositely arranged along a second direction, and the second direction is perpendicular to the first direction.
Further, a third buffer structure in a third direction is further arranged between the connection area of the acquisition nickel sheet and the voltage signal acquisition circuit.
Further, the third buffer structure comprises a plurality of connecting notch grooves arranged on the voltage fixing part for collecting the nickel sheet, the connecting notch grooves are formed through laser ablation, and the arrangement direction of the connecting notch grooves is the same as the first direction.
Further, the third buffer structure comprises a thermal expansion rubber pad arranged between the bottom tray and the FPC bump, and the thermal expansion rubber pad is limited in a packaging space between the bottom tray and the FPC bump;
the thermal expansion rubber pad expands along a third direction under the limitation of the packaging space when the temperature of the collected nickel sheet rises, and lifts a connecting area of the voltage signal collection circuit, a voltage welding point between the collected nickel sheet and the connecting area and a voltage fixing part of the collected nickel sheet along the third direction towards a direction far away from the bottom tray, wherein the third direction is a perpendicular direction of a plane formed by the first direction and the second direction.
According to the embodiment of the invention, by utilizing the lithium battery FPC signal acquisition device in the first scheme provided by the invention, the second scheme is provided as follows:
a lithium battery FPC signal acquisition method comprises the following steps:
acquiring acquisition signals from the conductive bars of the battery module through the acquisition nickel plates;
converting the acquisition signals into signal parameters through a signal acquisition circuit, wherein the signal acquisition circuit is arranged on the FPC body and the FPC bulge in a printing way;
transmitting the signal parameters to the FPC chip through the signal acquisition circuit and converting the signal parameters into signal information;
be provided with the first buffer structure of first direction between FPC body and the FPC arch, gather the second buffer structure that the nickel piece includes first direction, first buffer structure and second buffer structure are used for buffering the pulling force that the conductive bar kept away from the FPC body.
Compared with the prior art, the beneficial effect of technical scheme exclusive right that this application provided: through setting up a plurality of FPC archs on the FPC body, be provided with first buffer structure between FPC arch and the FPC body, further, set up second buffer structure on gathering the nickel piece body, first buffer structure and second buffer structure all set up in first direction, set up promptly in the long limit direction of gathering the nickel piece, first buffer structure and second buffer structure can cushion the outside pulling force from the conducting strip simultaneously, because the conducting strip is relative bigger to the effort of gathering the voltage solder joint of nickel piece and gathering the solder joint in the pulling force on gathering the long limit direction of nickel piece, consequently, dual buffer structure can effectively alleviate the destruction that causes because of the butt welding stability and the joint strength that the environmental variation leads to, this FPC signal acquisition device has better solder joint connection stability and solder joint strength for traditional PCBA signal acquisition device and current FPC circuit board signal acquisition device, signal acquisition system's equipment operation is more stable under the complex environment, life is also longer.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic view of a lithium battery FPC signal acquisition device with a FPC bump in one embodiment;
FIG. 2 is a schematic diagram of a structure for collecting nickel flakes in one embodiment;
FIG. 3 is a schematic diagram showing the first, second and third directions of the nickel plate collected in one embodiment;
FIG. 4 is a graph showing the comparison of deformation of a nickel plate under different environmental influences in one embodiment;
FIG. 5 is a schematic diagram of a connection notch of a third buffer structure for collecting nickel flakes according to an embodiment;
FIG. 6 is a schematic view of a collection of solder paste shaped guide ribs provided on a nickel plate in one embodiment;
FIG. 7 is a schematic diagram of a solder paste molded rib and capture nickel plate connection in one embodiment;
FIG. 8 is a schematic view of an arrangement of a thermal expansion cushion of a third buffer structure for collecting nickel flakes in one embodiment;
fig. 9 is a schematic structural view of a thermal expansion rubber pad of a third buffer structure in an embodiment.
Reference numerals:
10-FPC body; 11-FPC bumps; 12-torsion arm part; 121-a first recess; 122-a second recess; 13-thermal expansion rubber pads; 131-a central part; 132-edge portion; collecting nickel plates; 21-FPC connection end; 22-battery connection terminal; 23-a temperature fixing part; 24-voltage fixing part; 25-elongated holes; 26-a third recess; 27-fourth recesses; 28-connecting grooves; 29-solder paste forming guide ribs; 31-a voltage signal acquisition circuit; a 32-linking region; 33-voltage pad; 41-NTC positive circuit; 42-NTC negative circuit; a 43-NTC sensor; 44-an adhesive layer; 51-conducting bars; 52-collecting welding spots; 60-bottom tray.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
The embodiment provides a lithium battery FPC signal acquisition device, and the device is mainly applied to among the lithium battery module, and every lithium battery module includes a plurality of lithium battery modules, and this device carries out state acquisition and monitoring to each lithium battery module in every lithium battery module, including voltage signal acquisition and temperature signal acquisition.
The existing signal acquisition device based on the rigid PCBA circuit board has the following defects: each signal acquisition end is connected through a circuit structure such as a wire, and the whole manufacturing cost of the equipment is higher. The existing signal acquisition device based on the flexible FPC circuit board has the following defects: when equipment is installed, the connection stability between the FPC and the conductive bar 51 is sufficiently supported by the arrangement of the integral precision, so that the installation and the use of the FPC are not problematic, but in the working state of the battery module, particularly in a high-temperature environment, the battery core of the battery module can generate certain deformation due to the temperature rise, so that the conductive bar 51 can generate tensile forces in different directions with the acquisition nickel sheet 20 of the FPC, and the acquisition nickel sheet 20 is high in strength and has certain deformation elasticity, so that the acquisition nickel sheet 20 is not easy to damage, but the repeated pulling of two welding spots between the acquisition nickel sheet 20 and the flexible circuit board and between the acquisition nickel sheet 20 and the conductive bar 51 is easy to cause welding spot aging, partial tearing and circuit faults.
In order to solve the above technical problem, this embodiment provides a lithium battery FPC signal acquisition device, as shown in fig. 1, including:
the signal acquisition circuit is arranged on the FPC body 10 and the FPC bulge 11 in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge 11 and the FPC body 10;
the first buffer structure includes: the torsion arm portion 12 is disposed between the FPC protrusion 11 and the FPC body 10, the torsion arm portion 12 includes a first recess portion 121 and a second recess portion 122, and the first recess portion 121 and the second recess portion 122 are disposed opposite to each other in the first direction.
The acquisition nickel plate 20, wherein the acquisition nickel plate 20 is connected with a signal acquisition circuit, the acquisition nickel plate 20 comprises a battery connection end 22, the acquisition nickel plate 20 is fixedly connected with a conductive bar 51 of a battery module through the battery connection end 22, the acquisition nickel plate 20 acquires an acquisition signal from the conductive bar 51, and the acquisition signal is sent to the FPC chip through the acquisition circuit;
the collecting nickel plate 20 includes a second buffer structure in a first direction, the first direction is consistent with a long side direction of the collecting nickel plate 20, and the second buffer structure includes: at least one long strip-shaped hole 25 arranged on the acquisition nickel sheet 20, wherein the long side direction of the long strip-shaped hole 25 is consistent with the first direction.
The first buffer structure and the second buffer structure together buffer and collect external tension of the nickel sheet 20 in the first direction.
Specifically, the signal acquisition circuit includes a voltage signal acquisition circuit 31 and a temperature signal acquisition circuit; the voltage signal acquisition circuit 31 comprises a connection area 32, the connection area 32 is an end circuit printed on the FPC bump 11, and the voltage signal acquisition circuit 31 is connected with the acquisition nickel plate 20 through the connection area 32 in a welding way; the temperature signal acquisition circuit comprises an NTC positive circuit 41, an NTC negative circuit 42, an NTC sensor 43 and an adhesive layer 44, wherein the NTC sensor 43 is arranged on the FPC bump 11, and the NTC sensor 43 is fixedly connected with the acquisition nickel sheet 20 through the adhesive layer 44; when the external tensile force acts on the collected nickel sheet 20, two points of force are a voltage welding point 33 between the collected nickel sheet 20 and the connecting area 32 and a collecting welding point 52 between the collected nickel sheet 20 and the conductive bar 51.
As shown in fig. 3, the nickel sheet 20 is collected in this embodiment, which defines three directions: the first direction is the long side direction of the collected nickel piece 20, the second direction is the short side direction of the collected nickel piece 20, and the third direction is the plane perpendicular direction of the collected nickel piece 20.
Through set up a plurality of FPC archs 11 on FPC body 10, be provided with first buffer structure between FPC arch 11 and the FPC body 10, further, set up second buffer structure on gathering nickel piece 20 body, first buffer structure and second buffer structure all set up in first direction, set up promptly in the long limit direction of gathering nickel piece 20, first buffer structure and second buffer structure can cushion the outside pulling force from busbar 51 simultaneously, because the pulling force of busbar 51 on gathering nickel piece 20 long limit direction is relatively bigger to the effort of gathering nickel piece 20's voltage solder joint 33 and gathering solder joint 52, consequently, dual buffer structure can effectively alleviate the destruction that causes butt welding stability and joint strength because of environmental variation, this signal acquisition device has better solder joint connection stability and joint strength for traditional PCBA signal acquisition device and current FPC circuit board signal acquisition device, signal acquisition system's equipment operation solder joint is more stable under the complex environment, life is also longer.
Example two
Based on the lithium battery FPC signal acquisition device disclosed in the first embodiment, the preferred scheme is as follows:
a lithium battery FPC signal acquisition device, comprising:
the signal acquisition circuit is arranged on the FPC body 10 and the FPC bulge 11 in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge 11 and the FPC body 10; the acquisition nickel plate 20, wherein the acquisition nickel plate 20 is connected with a signal acquisition circuit, the acquisition nickel plate 20 comprises a battery connection end 22, the acquisition nickel plate 20 is fixedly connected with a conductive bar 51 of a battery module through the battery connection end 22, the acquisition nickel plate 20 acquires an acquisition signal from the conductive bar 51, and the acquisition signal is sent to the FPC chip through the acquisition circuit; the collecting nickel plate 20 comprises a second buffer structure in a first direction, the first direction is consistent with the long side direction of the collecting nickel plate 20, and the first buffer structure and the second buffer structure jointly buffer the external pulling force of the collecting nickel plate 20 in the first direction. The signal acquisition circuit comprises a voltage signal acquisition circuit 31 and a temperature signal acquisition circuit; the voltage signal acquisition circuit 31 comprises a connection area 32, the connection area 32 is an end circuit printed on the FPC bump 11, and the voltage signal acquisition circuit 31 is connected with the acquisition nickel plate 20 through the connection area 32 in a welding way; the temperature signal acquisition circuit comprises an NTC positive circuit 41, an NTC negative circuit 42, an NTC sensor 43 and an adhesive layer 44, wherein the NTC sensor 43 is arranged on the FPC bump 11, and the NTC sensor 43 is fixedly connected with the acquisition nickel sheet 20 through the adhesive layer 44; when the external tensile force acts on the collected nickel sheet 20, two points of force are a voltage welding point 33 between the collected nickel sheet 20 and the connecting area 32 and a collecting welding point 52 between the collected nickel sheet 20 and the conductive bar 51.
As shown in fig. 2, specifically, the collecting nickel plate 20 includes a voltage fixing portion 24 and a temperature fixing portion 23, the voltage signal collecting circuit 31 is welded to the voltage fixing portion 24 of the collecting nickel plate 20 through the connection area 32, the NTC sensor 43 is fixedly connected to the temperature fixing portion 23 of the collecting nickel plate 20 through the adhesive layer 44, the temperature fixing portion 23 is disposed at the other end of the battery connecting end 22 of the collecting nickel plate 20, and the voltage fixing portion 24 is located at one side of the middle of the collecting nickel plate 20 close to the temperature fixing portion 23.
That is, when the lithium battery FPC signal collection device includes the voltage signal collection circuit 31 and the temperature signal collection circuit, the conventional scheme selects to set the voltage welding spot 33 of the voltage signal collection circuit 31 at the FPC connection end 21, the collected nickel sheet 20 is provided with two ends along the long side direction, one is the FPC connection end 21, and the other is the battery connection end 22, the voltage welding spot 33 and the collected welding spot 52 are respectively provided at two ends of the collected nickel sheet 20, so that the elasticity of the nickel sheet itself can be utilized as much as possible, the nickel sheet generates the maximized deformation, thereby reducing the tension to the welding spot when the conductive bar 51 deforms, but, because the NTC sensor 43 (Negative Temperature Coefficient Sensor) of the temperature signal collection circuit is connected with the collected nickel sheet 20 through the bonding layer 44, the deformation of the collected nickel sheet 20 necessarily causes the deformation of the bonding layer 44 and influences the stability of the bonding layer 44 and finally influences the sensitivity and the service life of the NTC sensor 43 after repeated use.
Based on the above-mentioned problem, the temperature fixing portion 23 of the present embodiment is disposed at the other end of the battery connection end 22 of the collecting nickel plate 20, and the voltage fixing portion 24 is disposed at the middle of the collecting nickel plate 20 near the side of the temperature fixing portion 23, so that after the collecting nickel plate 20 is fixedly connected with the voltage fixing portion 24 through the voltage welding point 33, the subsequent deformation of the collecting nickel plate 20 occurs between the voltage fixing portion 24 and the battery connection end 22, and therefore, the adhesive layer 44 between the NTC sensor 43 and the collecting nickel plate 20 with insufficient relative connection stability is isolated and protected by the voltage welding point 33, thereby ensuring the connection stability.
Example III
Gather nickel piece 20 in the use, except the pulling force of first direction, still include the pulling force of second direction, the busbar 51 line can also exist along gathering nickel piece 20 broadside direction's deformation and pulling force promptly, in order to alleviate the pulling force in this direction, the second buffer structure of gathering nickel piece 20 of this embodiment still includes: the third concave part 26 and the fourth concave part 27 are arranged at two sides of the collecting nickel plate 20, the third concave part 26 and the fourth concave part 27 are oppositely arranged along a second direction, and the second direction is perpendicular to the first direction.
The cooperation of the third concave portion 26 and the fourth concave portion 27 can relieve the reciprocating pulling force along the second direction, so that the rigid structure of the acquisition nickel sheet 20 and the stability of two welding spots of the acquisition nickel sheet 20 are further protected.
Example IV
As shown in fig. 4, by further statistical analysis of the welding spot faults of the collected nickel sheet 20, the solutions from the first embodiment to the third embodiment can effectively improve the problems of tearing of the collected nickel sheet 20 and the tearing of the welding spot, and when the remaining welding spot faults are counted, the problems are found to occur in part of tearing and all tearing of the voltage welding spot 33, and by comparison, it is found that, when the lithium battery cell expands, the position of the conductive bar 51 is raised, and further the battery connection end 22 of the collected nickel sheet 20 is driven to rise, i.e. the voltage welding spot 33 is torn obliquely at a certain angle, so that the voltage welding spot 33 bears larger tearing tension, and therefore, the problems of part of tearing and all tearing of the voltage welding spot 33 are easy to occur under the condition that the deformation of the lithium battery cell is larger or the action of external vibration is superposed.
In order to solve the above technical problem, the present embodiment provides a lithium battery FPC signal acquisition device, and a third buffer structure in a third direction is further disposed between the acquisition nickel plate 20 and the connection area 32 of the voltage signal acquisition circuit 31. The third buffer structure is used for relieving the damage to the stability of the welding point caused by the tearing tension with an inclined angle on the voltage welding point 33 when the conductive bar 51 deforms in the third direction.
Specifically, as shown in fig. 5, the third buffer structure includes a plurality of connection grooves 28 disposed on the voltage fixing portion 24 of the collecting nickel plate 20, the connection grooves 28 are formed by laser ablation, and the arrangement direction of the connection grooves 28 is the same as the first direction. The voltage welding spot 33 is usually formed by printing solder paste and heating, when the solder paste melts, a plurality of reinforcing ribs in a first direction can be formed along the connecting notch 28, and the direction of the reinforcing ribs is consistent with the first direction, so that the voltage welding spot 33 with the reinforcing ribs in the first direction can generate better resistance to tearing pull force with an inclined angle, and particularly, the connecting notch 28 also increases the contact area between the voltage welding spot 33 and the collecting nickel plate 20, and when the tearing pull force with the inclined angle is generated, the voltage welding spot 33 is integrally pressed into the connecting notch 28 of the collecting nickel plate 20, so that the overall stability is enhanced.
Specifically, as shown in fig. 6-7, the third buffer structure may further include a solder paste forming guide rib 29 disposed on the voltage fixing portion 24 of the collecting nickel sheet 20, where the solder paste forming guide rib 29 may assist the voltage solder joint 33 to form a regular shape consistent with the direction in which the solder paste forming guide rib 29 is disposed during solder paste forming, so as to increase the contact area between the solder paste and the contact surface and form an internal reinforcing structure, and the formed voltage solder joint 33 has a higher overall strength and a stronger ability to resist the tearing tension of the oblique angle.
Example five
As in the fourth embodiment, the technical problem to be solved by this solution is that when the lithium battery cell deforms in the third direction, as shown in fig. 4, the tearing pull force of the collected nickel sheet 20 to the voltage welding spot 33 with an inclination angle has a great influence on the welding spot firmness, and the problem can be alleviated by enhancing the welding spot strength through the external structure, but adjusting the position of the voltage welding spot 33 so that the voltage welding spot 33 is flush with the collected welding spot 52 of the conductive bar 51 as much as possible is a better solution.
In order to achieve the above object and solve the technical problem, this embodiment provides a lithium battery FPC signal acquisition device, including: the signal acquisition circuit is arranged on the FPC body 10 and the FPC bulge 11 in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge 11 and the FPC body 10; the acquisition nickel plate 20, wherein the acquisition nickel plate 20 is connected with a signal acquisition circuit, the acquisition nickel plate 20 comprises a battery connection end 22, the acquisition nickel plate 20 is fixedly connected with a conductive bar 51 of a battery module through the battery connection end 22, the acquisition nickel plate 20 acquires an acquisition signal from the conductive bar 51, and the acquisition signal is sent to the FPC chip through the acquisition circuit; the collecting nickel plate 20 comprises a second buffer structure in a first direction, the first direction is consistent with the long side direction of the collecting nickel plate 20, and the first buffer structure and the second buffer structure jointly buffer the external pulling force of the collecting nickel plate 20 in the first direction. The signal acquisition circuit comprises a voltage signal acquisition circuit 31 and a temperature signal acquisition circuit; the voltage signal acquisition circuit 31 comprises a connection area 32, the connection area 32 is an end circuit printed on the FPC bump 11, and the voltage signal acquisition circuit 31 is connected with the acquisition nickel plate 20 through the connection area 32 in a welding way; the temperature signal acquisition circuit comprises an NTC positive circuit 41, an NTC negative circuit 42, an NTC sensor 43 and an adhesive layer 44, wherein the NTC sensor 43 is arranged on the FPC bump 11, and the NTC sensor 43 is fixedly connected with the acquisition nickel sheet 20 through the adhesive layer 44; when the external tensile force acts on the collected nickel sheet 20, two points of force are a voltage welding point 33 between the collected nickel sheet 20 and the connecting area 32 and a collecting welding point 52 between the collected nickel sheet 20 and the conductive bar 51. A third buffer structure in a third direction is further disposed between the connection region 32 of the acquisition nickel sheet 20 and the voltage signal acquisition circuit 31.
As shown in fig. 8, the third buffer structure includes a thermal expansion rubber pad 13 disposed between the collet 60 and the FPC bump 11, the thermal expansion rubber pad 13 being defined in a packaging space between the collet 60 and the FPC bump 11;
the thermal expansion rubber pad 13 expands along a third direction under the limitation of the packaging space when the temperature of the collected nickel sheet 20 increases, and lifts the connection region 32 of the voltage signal collection circuit 31, the voltage welding point 33 between the collected nickel sheet 20 and the connection region 32, and the voltage fixing portion 24 of the collected nickel sheet 20 along a third direction away from the bottom tray 60, where the third direction is a perpendicular direction of a plane formed by the first direction and the second direction.
In the expansion state of the lithium battery cell, the position of the collecting welding point 52 is raised, the nickel sheet 20 is deformed and generates tearing tension of the voltage welding point 33 obliquely upwards, meanwhile, the thermal expansion rubber pad 13, particularly, silica gel, is optionally used, the temperature is transmitted through the nickel sheet 20 to expand, the position of the voltage welding point 33 is raised to partially or completely offset the position of the collecting welding point 52, the inclination angle of the tearing tension is reduced, and the risk of tearing the voltage welding point 33 is correspondingly reduced.
Further, as shown in fig. 9, the thermal expansion rubber pad 13 further includes a central portion 131 and an edge portion 132, the central portion 131 of the thermal expansion rubber pad 13 adopts a first silica gel formulation with a higher thermal expansion coefficient, the edge portion 132 adopts a second silica gel formulation with a relatively lower thermal expansion coefficient, during processing, firstly, liquid silica gel of the first silica gel formulation is dripped at an expansion positioning position of the FPC body 10 to form the central portion 131, and then, the liquid silica gel of the second silica gel formulation is continuously dripped around the central portion 131 to form the edge portion 132.
Considering that the lithium battery cell may shrink in the third direction, at this time, the thermal expansion rubber pad 13 will further raise the position of the voltage welding spot 33 under the high temperature state, however, when the position of the voltage welding spot 33 is higher, the collecting nickel sheet 20 extrudes the voltage welding spot 33 onto the surface of the FPC bump 11, the friction force between the collecting nickel sheet 20 and the whole welding spot will not generate tearing tension in the separation direction, and the welding area of the collecting welding spot 52 is very large, although the tearing tension in the separation direction will not generate great influence, so this scheme is a better anti-tearing lithium battery FPC signal collecting device.
Example six
The embodiment provides a lithium battery FPC signal acquisition method, which comprises the following steps:
s101: acquiring acquisition signals from the conductive bars 51 of the battery module through the acquisition nickel plates 20;
s102: converting the acquisition signals into signal parameters through a signal acquisition circuit, wherein the signal acquisition circuit is arranged on the FPC body 10 and the FPC bulge 11 in a printing way;
s103: the signal parameters are transmitted to the FPC chip through the signal acquisition circuit and converted into signal information, a first buffer structure in a first direction is arranged between the FPC body 10 and the FPC bulge 11, the acquisition nickel sheet 20 comprises a second buffer structure in the first direction, and the first buffer structure and the second buffer structure are used for buffering the tensile force of the conductive bars 51, which is far away from the FPC body 10.
Through set up a plurality of FPC archs 11 on FPC body 10, be provided with first buffer structure between FPC arch 11 and the FPC body 10, further, set up second buffer structure on gathering nickel piece 20 body, first buffer structure and second buffer structure all set up in first direction, set up promptly in the long limit direction of gathering nickel piece 20, first buffer structure and second buffer structure can cushion the outside pulling force from busbar 51 simultaneously, because the pulling force of busbar 51 on gathering nickel piece 20 long limit direction is relatively bigger to the effort of gathering nickel piece 20's voltage solder joint 33 and gathering solder joint 52, consequently, dual buffer structure can effectively alleviate the destruction that causes butt welding stability and joint strength because of environmental variation, this signal acquisition device has better solder joint connection stability and joint strength for traditional PCBA signal acquisition device and current FPC circuit board signal acquisition device, signal acquisition system's equipment operation solder joint is more stable under the complex environment, life is also longer.
Further, the lithium battery FPC signal acquisition method further comprises the following steps:
s104: the FPC chip generates a plurality of temperature signal parameters on a plurality of FPC bulges 11 into environment temperature parameters, wherein the environment temperature parameters comprise position numbers of detection positions, temperature parameters of the detection positions and temperature parameters of adjacent detection positions;
s105: monitoring an environmental temperature parameter in real time and generating an auxiliary judgment parameter, wherein the auxiliary judgment parameter is an average value of differences between at least one ortho-position temperature parameter and a home-position temperature parameter;
s106: acquiring a high-temperature abnormal signal, wherein the high-temperature abnormal signal is a signal that the temperature parameter of the detection position exceeds the threshold parameter of the working procedure category;
and S107, outputting the high-temperature abnormal signal as a sensor abnormal signal if the auxiliary judgment parameter exceeds the auxiliary judgment threshold value in one auxiliary judgment unit time after the high-temperature abnormal signal acquisition time point, and outputting the high-temperature abnormal signal as a lithium battery cell abnormal signal if the auxiliary judgment parameter does not exceed the auxiliary judgment threshold value.
According to the scheme, each detection bit sends not only a temperature parameter but also an ambient temperature signal to the MCU module of the cabinet body, wherein the ambient temperature signal not only comprises a local temperature parameter but also comprises an ortho-position temperature parameter, the ortho-position temperature parameter can be obtained by directly obtaining the ortho-position temperature parameter from the ortho-position after communication connection is established between the signal receiving and sending module of the detection bit and the signal receiving module of at least one surrounding detection bit, specifically, the time parameter can be increased in the ambient temperature signal, namely, the local temperature parameter and the ortho-position temperature parameter are obtained according to fixed time intervals, the influence relation between the local temperature parameter and the ortho-position temperature parameter is detected by setting an auxiliary judgment threshold, when the auxiliary judgment parameter exceeds the auxiliary judgment threshold in one auxiliary judgment unit time after the acquisition time point of the high-temperature abnormal signal, the high-temperature abnormal signal is output as a sensor abnormal signal, and when the auxiliary judgment parameter does not exceed the auxiliary judgment threshold, the surrounding detection bit is also increased, the high-temperature abnormal signal is output as a lithium battery cell abnormal signal.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.
It is noted that when an element is referred to as being "fixed" or "disposed on" another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" or "a number" is two or more, unless explicitly defined otherwise.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the scope of the present disclosure, since any structural modifications, proportional changes, or dimensional adjustments made by those skilled in the art should not be made in the present disclosure without affecting the efficacy or achievement of the present disclosure.
Claims (4)
1. A lithium cell FPC signal acquisition device, its characterized in that includes:
the signal acquisition circuit is arranged on the FPC body and the FPC bulge in a printing way; a first buffer structure in a first direction is arranged between the FPC bulge and the FPC body; the first buffer structure includes: the torsion arm part is arranged between the FPC bulge and the FPC body and comprises a first concave part and a second concave part, and the first concave part and the second concave part are oppositely arranged along a first direction;
the acquisition nickel plate is connected with the signal acquisition circuit and comprises a battery connecting end, the acquisition nickel plate is fixedly connected with a conductive bar of the battery module through the battery connecting end, the acquisition nickel plate acquires an acquisition signal from the conductive bar, and the acquisition signal is sent to the FPC chip through the acquisition circuit; the voltage signal acquisition circuit is welded with the voltage fixing part of the acquisition nickel sheet through the connecting area, the NTC sensor is fixedly connected with the temperature fixing part of the acquisition nickel sheet through the bonding layer, the temperature fixing part is arranged at the other end of the battery connecting end of the acquisition nickel sheet, and the voltage fixing part is positioned at one side of the middle part of the acquisition nickel sheet close to the temperature fixing part;
the first buffer structure and the second buffer structure jointly buffer the external tension of the collected nickel sheet in the first direction; the second buffer structure includes: the long side direction of the strip-shaped hole is consistent with the first direction; the second buffer structure further includes: the third concave part and the fourth concave part are arranged at two sides of the nickel collecting sheet, the third concave part and the fourth concave part are oppositely arranged along a second direction, and the second direction is perpendicular to the first direction; a third buffer structure in a third direction is further arranged between the connection area of the nickel acquisition sheet and the voltage signal acquisition circuit, and the third direction is the perpendicular direction of a plane formed by the first direction and the second direction; the third buffer structure comprises a plurality of connecting notch grooves arranged on the voltage fixing part for collecting the nickel sheet, the connecting notch grooves are formed through laser ablation, the arrangement direction of the connecting notch grooves is the same as the first direction, the voltage welding spots are formed through printing solder paste in a heating mode, a plurality of reinforcing ribs in the first direction can be formed along the connecting notch grooves when the solder paste melts, and the directions of the reinforcing ribs are consistent with the first direction.
2. The lithium battery FPC signal acquisition device according to claim 1, wherein the signal acquisition circuit comprises a voltage signal acquisition circuit and a temperature signal acquisition circuit;
the voltage signal acquisition circuit comprises a connection area, wherein the connection area is an end circuit printed on the protrusion of the FPC, and the voltage signal acquisition circuit is connected with an acquisition nickel plate in a welding way through the connection area;
the temperature signal acquisition circuit comprises an NTC positive circuit, an NTC negative circuit, an NTC sensor and an adhesive layer, wherein the NTC sensor is arranged on the FPC boss and is fixedly connected with the acquisition nickel sheet through the adhesive layer;
when external tension acts on the collected nickel sheet, two points of force are voltage welding spots between the collected nickel sheet and the connecting area and collecting welding spots between the collected nickel sheet and the conducting bars.
3. The lithium battery FPC signal pickup device according to claim 1, wherein the third buffer structure includes a thermal expansion rubber pad disposed between the bottom tray and the FPC bump, the thermal expansion rubber pad being defined in a packaging space between the bottom tray and the FPC bump;
the thermal expansion rubber pad expands along a third direction under the limitation of the packaging space when the temperature of the collected nickel sheet rises, and lifts a connecting area of the voltage signal collection circuit, a voltage welding point between the collected nickel sheet and the connecting area and a voltage fixing part of the collected nickel sheet along the third direction towards a direction far away from the bottom tray, wherein the third direction is a perpendicular direction of a plane formed by the first direction and the second direction.
4. The lithium battery FPC signal acquisition method comprises the lithium battery FPC signal acquisition device according to claim 1, and is characterized by further comprising:
acquiring acquisition signals from the conductive bars of the battery module through the acquisition nickel plates;
converting the acquisition signals into signal parameters through a signal acquisition circuit, wherein the signal acquisition circuit is arranged on the FPC body and the FPC bulge in a printing way;
the signal parameter is transmitted to the FPC chip through the signal acquisition circuit and converted into signal information, a first buffer structure in a first direction is arranged between the FPC body and the FPC bulge, the acquisition nickel sheet comprises a second buffer structure in the first direction, and the first buffer structure and the second buffer structure are used for buffering the tensile force of the conductive bars, which is far away from the FPC body.
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| CN202311689253.XA CN117393960B (en) | 2023-12-11 | 2023-12-11 | Lithium battery FPC signal acquisition device and method |
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| US7077908B2 (en) * | 2003-05-30 | 2006-07-18 | Matsushita Electric Industrial Co., Ltd. | Substrate holder |
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| JP2007165756A (en) * | 2005-12-16 | 2007-06-28 | Matsushita Electric Ind Co Ltd | Interlayer connecting sheet, and its manufacturing method, and multilayer flexible printed wiring board using the same |
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