CN112924865A - Rapid detection device and detection method for reliability of lithium battery current cut-off device - Google Patents
Rapid detection device and detection method for reliability of lithium battery current cut-off device Download PDFInfo
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- CN112924865A CN112924865A CN202110120535.2A CN202110120535A CN112924865A CN 112924865 A CN112924865 A CN 112924865A CN 202110120535 A CN202110120535 A CN 202110120535A CN 112924865 A CN112924865 A CN 112924865A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000001960 triggered effect Effects 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 51
- 238000003466 welding Methods 0.000 claims description 23
- 238000013461 design Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims 1
- 238000007689 inspection Methods 0.000 abstract description 4
- 239000000919 ceramic Substances 0.000 description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000002591 computed tomography Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a quick detection device and a detection method for the reliability of a lithium battery current cutting device, which comprise a base, an upright post, a lead screw, a stepping motor, a workbench, a spindle box, a laser range finder and a drill bit kit, wherein the stepping motor and the lead screw form transmission fit; the laser range finder acquires vertical distance information and corresponding position information between the spindle box and the workbench; the drill bit external member can be detachably connected in the drill bit interface, so that the battery sample top cover is punched, the current cut-off device is triggered in a programmed manner in a physical mode, and the reliability of the current cut-off device is detected under the condition that gas is not generated in the battery. Compared with the prior art, the invention can directly detect the reliability of the current cut-off device (CID) of the cylindrical lithium battery finished product by designing the special drilling device, is quick, convenient, simple and efficient to use, and is suitable for quality inspection and detection of the second party and the third party of the cylindrical lithium battery product.
Description
Technical Field
The invention relates to the technical field of lithium ion battery safety evaluation, in particular to a device and a method for quickly detecting the reliability of a lithium battery current cut-off device.
Background
The lithium battery Safety Device is generally integrated in a cap structure portion of a battery cell, and includes a thermistor (Positive Temperature Coefficient), a Current cut-off Device (Current Interrupt Device), a Safety valve (Safety Vent, also called a pressure release valve), and the like. When lithium cell intensification, inside production gas, can make welding portion by the snap through the valve block action, the open circuit, battery internal pressure continues to rise and can lead to the valve block to break, and the pressure release of gassing prevents that the lithium cell from because the too high explosion of internal pressure.
The current cut-off device has a protection function of a lithium ion battery safety device, when a battery fails, the interior of the battery generates heat and generates gas, the pressure reaches a certain degree to break a welding part between the partition plate and the Valve plate (Valve), the Valve plate (Valve) overturns to cause the internal circuit break of the battery cell, and therefore the cut-off current plays a role in protection. However, since the battery has a certain amount of gas inside under the normal working condition, the battery fails under the normal working condition due to the excessively low snapping pressure of the welding part, and the safety device fails due to the excessively high pressure, so that the battery is out of control or even explodes. Therefore, the lithium batteries of the same type have high requirements on the quality control and the snapping pressure uniformity of the welding part between the partition plate and the valve plate.
A safety valve of a lithium ion battery is a primary safety device which is arranged for preventing the lithium ion battery from burning or exploding under the unexpected conditions of overcurrent, overcharge, external short circuit and the like. The design of the safety valve was almost consequential after sony introduced the first commercial lithium battery in 1990. The earliest safety valve designs dates back to 1993. With the large-scale application of the lithium ion battery, the design of the safety valve is also subjected to multiple iterations, and becomes an important component in the structure of the lithium ion battery. However, as a battery product in the downstream of the industrial chain, a quick and effective inspection means for the quality of the lithium ion battery safety valve is still lacking.
The existing related patents are represented by chinese patent CN103439095A and chinese patent CN101793586A, and mainly aim at testing a lithium battery safety valve unit that is not assembled on a lithium battery, and the usage scenario is limited to a first-party laboratory of a lithium battery safety valve manufacturer (supplier) and a lithium battery manufacturer (supplier), and the data of the existing related patents does not necessarily have credibility for the supplier of the lithium battery. The safety valve monomer corresponding to the lithium battery is difficult to obtain in laboratories of second parties and third parties with higher reliability, and the direct in-situ test of the safety valve in the lithium battery mostly depends on high-precision X-ray or Computed Tomography (CT) equipment, so that the equipment is high in price and has limitation.
Chinese patent CN103439095A relates to an automatic testing device and testing method for the valve pressure of a battery safety valve, the testing device comprises at least one testing component for testing the valve pressure of the safety valve, an air source device for supplying compressed air to the testing component, and a controller connected to the testing component, the testing component comprises a buffer tank, and a pressing member disposed above the buffer tank, an inlet of the buffer tank is communicated with the air source device, the testing component further comprises a pressure sensor connected to an outlet of the buffer tank, and the controller is mainly used for analyzing the pressure sensed by the pressure sensor to obtain a testing result. Through setting up the test assembly that connects in parallel each other more than two, can carry out automatic test to a plurality of relief valves simultaneously. The testing device can accurately and efficiently test the opening and closing valve pressures of a plurality of safety valves at one time, particularly test the closing valve pressure by a valve pressure drop amplitude comparison method, can greatly shorten the testing time, and can also detect the safety valves with the defect of chronic air leakage. But the device can only test the safety valve monomer, and can not reflect the actual situation when the safety valve monomer is actually used in a battery finished product. Secondly, the test needs to be equipped with the compressed air source, and is inconvenient to remove. In addition, for safety valves with different specifications, buffer tanks with corresponding specifications need to be configured, so that the operation is complex and the test cost is high.
Chinese patent CN101793586A relates to a precision testing device for a cylindrical lithium ion battery safety valve, which comprises a pressure seat, a base and a control system, wherein elastic contacts are respectively arranged in hollow cavities of the pressure seat and the base, and the two elastic contacts are respectively connected with the control system to test the internal resistance of the safety valve and the breaking pressure of a welding part; the cavity in the base is communicated with an air inlet pipe, the air inlet pipe is provided with a pressure sensor, an electromagnetic valve, a progressive switch, a pressure gauge and a pressure stabilizing air source, and the pressure sensor, the electromagnetic valve and the progressive switch are connected with a control system to test the overturning pressure and the blasting pressure of the safety valve; the pressing seat or the elastic contact of the pressing seat is provided with a pressing sensor control connected with the control system. However, the safety valve for testing the device needs to comprise an upper cover cap, an orifice plate, an explosion-proof membrane and a sealing ring, and meanwhile, the orifice plate and the explosion-proof membrane need to be subjected to laser welding, so that a finished product or a finished product part cannot be used for testing, the preparation work is complicated, and the professional requirement is high. Meanwhile, the safety valve of the device to be tested is limited by the shape of the base, and the application scene is single.
CN106997027A discloses a lithium battery explosion-proof valve compression resistance testing device, which comprises a battery support and a threaded drill rod, wherein the threaded drill rod comprises a threaded base rod, the surface of which is provided with external threads, a through hole is arranged inside the threaded base rod, one end of the threaded base rod is connected with a pneumatic connector, the other end of the threaded base rod is fixed with a drill bit, the surface of the drill bit is provided with a groove penetrating through the two ends of the drill bit, and the pneumatic connector and the groove are respectively communicated with the two ends of the through hole to form an air channel structure; an annular groove is formed in the threaded base rod around the drill bit, and a sealing ring is fixed in the annular groove; the handle is fixed on the thread base rod, the thread base rod is connected with a threaded hole in the battery support through external threads on the surface of the thread base rod to form a screw rod structure, and the drill points to a lithium battery installation position on the battery support. And use the handle to promote the screw thread drilling rod to bore into the battery among this technical scheme, it is higher to operating personnel specialty requirement, and it may bore through the battery diaphragm and lead to internal short circuit to bore into too deeply, has the fire, explosion risk, and it may not bore through battery casing to bore into too shallowly, can't ventilate to battery inside, has certain safe risk. In addition, the manual operation speed is slow, and the test result is poor in consistency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for quickly detecting the reliability of a lithium battery current cut-off device.
The invention monitors the pressure signal of the piezoelectric ceramic sensor through a Programmable Logic Controller (PLC), and controls a stepping motor and a drilling machine motor to automatically feed, stop and withdraw the cutter.
The invention aligns the drill bit and the workbench by a laser rangefinder. The distance from the main spindle box to the battery top cover is measured by using a laser distance meter by loosening a fixed handle rotating workbench on the upright post, then the distance from the standard drill bit head to the battery top cover (or from the test drill bit head to the welding part of the current cutting device) is automatically calculated according to the length of the corresponding drill bit arranged in the programmable logic controller, the corresponding drilling depth is set, and then the battery top cover and the welding part of the current cutting device are drilled through in sequence. The valve plate of the current cut-off device is triggered to bounce under the action of inherent internal stress by destroying the welding part between the valve plate of the current cut-off device and the inside of the battery, and the valve plate impacts the piezoelectric ceramic sensor to generate pressure FVThe valve plate has an inherent internal stress σV＝FV。
The purpose of the invention can be realized by the following technical scheme:
the invention aims to protect a quick detection device for the reliability of a lithium battery current cutting device, which comprises a base, a stand column, a lead screw, a stepping motor, a workbench, a spindle box, a laser range finder and a drill bit kit, wherein the quick detection device comprises:
the upright column is arranged on the base;
the screw rod is connected with the upright post;
the stepping motor and the lead screw form transmission fit, so that the stepping motor can move up and down along the lead screw;
the workbench is connected to the upright post and can horizontally rotate to adjust the position, and the battery sample is fixed on the workbench;
the main shaft box is connected with the stepping motor, and a drill bit interface is arranged at the lower end of the main shaft box;
the laser range finder is arranged on the spindle box and used for obtaining vertical distance information and corresponding position information between the spindle box and the workbench;
the drill bit kit is detachably connected to the drill bit interface, the top cover of the battery sample is punched under the vertical force driving of the stepping motor and the torsion driving of the spindle box, the current cut-off device is triggered in a programmed mode through a physical mode, and the reliability of the current cut-off device is detected under the condition that gas is not generated inside the battery.
Furthermore, the quick detection device for the reliability of the lithium battery current cutting device further comprises a programmable logic controller, and the programmable logic controller is electrically connected with the laser range finder and the stepping motor respectively.
Further, step motor is equipped with two independent control's output, and wherein, first independent output constitutes transmission fit with the lead screw, and the independent output of second is connected with the headstock transmission.
Further, the drill kit includes a standard drill that enables drilling holes in the top cover of the battery sample and a test drill that programmatically physically triggers the current shut-off device.
Furthermore, the test drill comprises a drill body, an annular piezoelectric ceramic sensor and a drill insulation protection sleeve, wherein the annular piezoelectric ceramic sensor is arranged at one end close to the head of the drill body, and the annular piezoelectric ceramic sensor is electrically connected with the programmable logic controller through a piezoelectric signal wire.
Further, the diameter of the standard drill bit is larger than that of the drill bit insulation protection sleeve.
Furthermore, the annular piezoelectric ceramic sensor is positioned outside the test drill bit and is fixed on the spindle box through a drill bit insulating protective sleeve.
Further, the workbench comprises a workbench main body, a cylindrical battery bin is arranged on the workbench main body, and the battery sample is fixed in the cylindrical battery bin.
Further, still be equipped with clamping component and locating hole in the workstation main part, clamping component locates in the cylindrical battery compartment, realizes the clamp of battery sample.
The second purpose of the invention is to protect a quick detection method for the reliability of a lithium battery current cut-off device, which comprises the following steps:
s1: placing a battery sample into a cylindrical battery cabin for fixing;
s2: rotating the adjusting workbench to enable the battery top cover to align to the laser range finder, and measuring the distance from the spindle box to the battery top cover;
s3: installing a standard drill bit on a main spindle box, and automatically calculating the distance from the head of the standard drill bit to a top cover of a battery by a programmable logic controller according to built-in parameters;
s4: the workbench is rotationally adjusted again, and the laser range finder is used for realizing the axial position alignment of the spindle box and the workbench through the positioning hole;
s5: the standard drill bit is retracted after drilling through the battery top cover, and after the standard drill bit is replaced by the test drill bit, the test drill bit can drill to the standard position of the valve plate welding part of the current cutting device in the battery parameters according to a preset drilling program;
s6: recording pressure data F of a piezoceramic sensorVThe inherent internal stress σ of the valve platev＝FVTo determine sigmaVWhether or not at sigmaV-min～σV-maxAnd determining the reliability according to the range.
Further, according to the battery specification design data, the tensile force range F required for breaking the welding part by pulling is obtainedmin～FmaxAnd trip trigger value F of current cut-off deviceair-min～Fair-maxBased on σV-min＝Fmin-Fair-max， σV-max＝Fmax-Fair-minObtaining the required inherent internal stress range of the valve plate as sigmaV-min～σV-max。
Compared with the prior art, the invention has the following technical advantages:
1. the invention can directly detect the reliability of the current cut-off device (CID) of the cylindrical lithium battery finished product by designing the special drilling device, is quick, convenient, simple and efficient to use, and is suitable for quality inspection and detection of a second party and a third party of the cylindrical lithium battery product;
2. the invention can determine the state of the current cut-off device (CID) without using a high-pressure air source or carrying out high-quality X-ray scanning or Computed Tomography (CT) shooting by designing a group of replaceable drill bits to be matched with the stepping motor and the piezoelectric ceramic sensor without being influenced by the design of an internal structure of the battery, and is economical and convenient;
3. the invention triggers the current cut-off device (CID) in a physical mode, can detect the reliability of the current cut-off device (CID) under the condition that gas is not generated in the battery, and is safe and environment-friendly.
Drawings
FIG. 1 is a schematic diagram of a standard drill bit drilling through a battery top cover;
FIG. 2 is a schematic view of a process of a test bit breaking a weld of a battery current cutoff device;
FIG. 3 is a schematic diagram of a process of turning up a valve plate of a current cutting device to impact a piezoelectric ceramic sensor;
fig. 4 is a schematic structural diagram of a device for rapidly detecting the reliability of a current cut-off device of a lithium battery in the technical scheme;
FIG. 5 is a schematic view of the structure of the test bit according to the present embodiment;
FIG. 6 is a schematic top view of a test bit according to the present teachings;
FIG. 7 is a schematic structural diagram of a workbench according to the present disclosure;
fig. 8 is a schematic top cross-sectional view of a cell according to the present embodiment.
In fig. 4: 1-a spindle box, 2-a stepping motor, 3-a programmable logic controller, 4-a lead screw, 5-a laser range finder, 6-a test drill bit, 7-a standard drill bit, 8-an upright post, 9-a fixed handle, 10-a workbench and 11-a base;
in FIGS. 5 to 6: 6-1-a drill bit body, 6-2-a piezoelectric ceramic sensor, 6-3-a drill bit insulation protective sleeve and 6-4 piezoelectric signal wires;
in fig. 7: 10-1-cylindrical battery bin, 10-2-wing screw, 10-3-antiskid skin layer and 10-4-positioning hole;
in fig. 8: 12-a top cover; 13-sealing ring; 14-a valve plate; 15-a separator; 16-sealing ring; 17-positive tab; 18-a weld; 19-pole piece.
Detailed Description
In the past chinese patent, a Safety function structure including a thermistor, a current cut-off device, a relief valve, and the like is described and generally referred to as a Safety Vent (Safety Vent). However, in various scientific and journal literatures, the "Safety valve" is generally used to refer to a pressure relief valve, and the "Safety valve" (Safety function structure) in the patent is replaced by a "Safety Device". This patent follows the latter and defines, and lithium cell safety device definition is equivalent to the relief valve in the past patent in this patent promptly, and the relief valve definition is equivalent to the relief valve in the past patent.
The equipment for rapidly evaluating the reliability of the lithium battery current cutoff device (CID) has a simple structure and is easy to use, and comprises a set of special drilling system with pressure monitoring, a set of replaceable drill bit and a rack. The device can use a common X-ray imager to carry out in-situ detection on the lithium battery, is suitable for a second or third-party laboratory, and is simple in structure, convenient and fast. The battery sample was fixed on a bench and the drill bit and battery center were positioned and aligned by a laser rangefinder. And the reliability standard drill bit is drilled into the standard position of the welding part of the current cutting device according to the geometric structure parameters of the battery provided by the equipment manufacturer or the standard position of the welding part of the current cutting device determined by the X-ray scanning photograph until the top cover of the battery is damaged, and then the drill bit is retracted. And replacing the special drill bit, automatically feeding the special drill bit to the welding position of the current breaking device according to a set program, stopping the special drill bit, recording the data of the pressure sensor and obtaining a test result. The Programmable Logic Controller (PLC) on the main spindle box can position and align the workbench and the main spindle box, set the feed distance, and record and transmit pressure sensor data. The workstation adaptation of cylinder type various sizes cylinder type battery, workstation inboard lateral wall have two pairs of anti-skidding cortex, and through wing section screw fixation, can match different battery diameters through the adjustment.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The structure of the equipment for rapidly evaluating the reliability of a Current Interrupt Device (CID) in a lithium battery in the present embodiment is shown in fig. 4 to 8, and comprises: the device comprises a main spindle box 1, wherein a stepping motor 2, a programmable logic controller 3, a laser range finder 5, a test drill bit 6 or a standard drill bit 7 are installed on the main spindle box 1, the stepping motor 2 is connected with an upright post 8 and a base 11 through a lead screw 4 with a dust hood, and a workbench 10 is fixed on the upright post 8 through a fixed handle 9.
The whole device is of a vertical drilling system structure, wherein a spindle box 1 provides power for a drilling part of a drill bit, a stepping motor 2 and a lead screw 4 with a dustproof cover are responsible for providing power for axial displacement of the spindle box, a laser range finder 5 is responsible for aligning the axial positions of the spindle box and a workbench, the components are further controlled through a programmable logic controller 3, and the tool advancing and retracting distance, the axial position of inspection equipment and the like can be controlled. The replaceable drill bit includes: the standard drill 7 is used for drilling a hole in the battery top cover 12, the test drill 6 is further used for drilling into the top cover 12, the splicing elastic force of the valve plate 14 returning to the horizontal state is recorded through the annular piezoelectric ceramic sensor 6-2 while the welding part 18 is damaged, and further the pressure value is transmitted into the programmable logic controller 3 through the piezoelectric signal line 6-4 to control the cutter stopping action of the drilling system, so that the short circuit in the battery caused by excessive drilling is prevented. The rack includes: the device comprises a vertical column 8 and a base 11 for supporting a spindle box 1, a lead screw 2 and a workbench 10, a fixed handle 9 for fixing the position of the workbench, the workbench 10 for fixing a battery sample, and further a non-slip leather layer 10-3 is controlled by a wing screw 10-2 to fix the battery sample.
The programmable logic controller 4, preferably with a Controller Area Network (CAN) communication interface, may be implemented for data logging or remote operation via a data logging device or control system.
The relevant parts of the current cut-off device of the tested battery sample typically comprise a top cover 12, a sealing ring 13 and a valve plate 14; a partition 15; a seal ring 16; a positive tab 17; a weld 18; and the pole piece 19 causes the valve plate 14 to be separated from the positive lug 17 from the welding part 18 when the internal pressure of the battery reaches a certain level, and the connection between the battery top cover 12 and the pole piece 19 is broken through the combined action of the internal pressure and the shearing elasticity of the valve plate, so that the battery reaches an external open circuit state.
The working principle is as follows: this device is vertical drilling structure, and concrete during operation: the battery sample is put into a cylindrical battery bin 10-1 of a workbench 10 to be fixed, the fixed handle 9 is loosened, the workbench 10 is rotated to enable a battery top cover 12 to be aligned to the laser range finder 5, and the distance from a spindle box 1 to the battery top cover 12 is measured. The standard drill 7 is installed on the main spindle box 1, the programmable logic controller 3 automatically calculates the distance from the head of the standard drill 7 to the top cover 12 of the battery according to built-in parameters, the workbench 10 is rotated again, the laser range finder 5 is used for aligning the axial position of the drilling part of the main spindle box 1 and the axial position of the workbench 10 through the positioning hole 10-4 in the workbench 10, and the fixed handle 9 is used for fixing. And setting a drilling program on the programmable logic controller 3 according to the battery parameters, operating the program reliability standard drill bit 7 to drill through the battery top cover 12 and then retracting the cutter, using the programmable logic controller 3 to set a new drilling program after using the test drill bit 6 to replace the standard drill bit 7 so that the test drill bit 6 can drill right to the standard position of the valve plate welding part 18 of the current cut-off device in the battery parameters, and setting a pressure sensor protection pressure threshold value to prevent the pressure sensor from being damaged due to excessive drilling. Running a preset program to enable the test drill 6 to drill to the standard position of the valve plate welding part 18 of the current cut-off device in the battery parameters, and recording the pressure data F of the piezoelectric ceramic sensor 6-2VThe inherent internal stress σ of the valve platev＝FV。
Obtaining the tensile force range F required for breaking the welding part according to the battery specification design data provided by the battery manufacturermin～FmaxAnd the trip trigger value (i.e., the internal air pressure at which the welded portion is broken) F of the current interrupting deviceair-min～Fair-maxThe inherent internal stress range of the valve plate can be calculated to be sigmaV-min～σV-max (σV-min＝Fmin-Fair-max，σV-max＝Fmax-Fair-min)。
Determine sigmaVWhether or not at sigmaV-min～σV-maxIn the range: if yes, the reliability of the current cut-off device meets the standard; if not, the reliability of the current cutting device does not meet the standard.
When the device is used specifically, the device comprises the following steps (taking a certain commercial 18650 cylindrical battery as an example):
in a commercial 18650 cylindrical battery of some type, its battery top cover part contains the current cut-off device, and is typical structure, destroys the welding part 18 between current cut-off device valve block 14 and positive pole ear 17 and makes valve block 14 turn up, reaches the purpose of making the battery shell open circuit.
(1) Putting a battery sample into a cylindrical battery bin 10-1, and rotating a wing-shaped screw 10-2 to ensure that an anti-skid skin layer 10-3 is tightly attached to the battery sample and fixed;
(2) loosening the fixed handle 9 and rotating the adjusting table 10 to align the battery top cover 12 with the laser range finder 5 and measuring the distance d from the headstock 1 to the battery top cover 121Then, the standard drill bit 7 is installed on the main spindle box 1, and the programmable logic controller 3 is used for measuring the horizontal plane distance d from the head of the built-in standard drill bit 7 to the laser range finder 5 of the main spindle box 1 box body2The distance d from the head of the standard drill 7 to the battery top cover 12 is automatically calculated3＝d1-d2；
(3) The workbench 10 is rotated again, the axial position alignment of the drilling part of the spindle box 1 and the workbench 10 is realized through a positioning hole 10-4 on the workbench 10 by the laser range finder 5, and the position of the workbench 10 is fixed by using a fixed handle 9;
(4) the programmable logic controller 3 reads the thickness d of the battery top cover 12 from the battery parameters4And distance d from top cover 12 to current interrupt device weld 185；
(5) The programmable logic controller 3 issues an electrical signal command, which includes the following actions:distance of drilling down is D1 (D1＝d3+d4) Setting the cutter to be retreated to the original position after the drilling is finished, running the program, checking the battery sample after the program is finished, and ensuring that the battery top cover 12 is drilled completely (see figure 1);
(5) after the standard drill bit 7 is detached, the test drill bit 6 is installed, and the programmable logic controller 3 sets the drilling distance to be D2(D2＝d3+d4+d5) And setting the cutter stop position after the drilling is finished, and simultaneously setting the protective pressure of the pressure sensor to prevent the pressure sensor from being damaged due to excessive drilling. Running a program, wherein after the test drill 6 breaks the welding part 18 (see figure 2) of the current cutting device, the current cutting device turns upwards and impacts the piezoelectric ceramic sensor 6-2 (see figure 3);
(6) record piezoceramic sensor 6-2 reading F1The inherent internal stress σ of the valve plate1＝F1；
(7) Obtaining the tensile force range F required for breaking the welding part according to the battery specification design data provided by the battery manufacturermin～FmaxAnd designing the trip trigger value (i.e., the internal air pressure at which the welded portion is broken) F of the current interrupting deviceair-min～Fair-maxThe inherent internal stress range of the valve plate can be calculated to be sigmaV-min～σV-max (σV-min＝Fmin-Fair-max，σV-max＝Fmax-Fair-min)
(8)σV-min＜σ1＜σV-max(ii) a The reliability of the current cut-off device is proved to meet the standard.
The embodiments described above are described to facilitate an understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a quick detection device of lithium cell current cutting device reliability which characterized in that includes:
a base (11);
the upright post (8) is arranged on the base (11);
the screw rod (4) is connected with the upright post (8);
the stepping motor (2) is in transmission fit with the lead screw (4), so that the stepping motor (2) can move up and down along the lead screw (4);
a workbench (10) connected to the upright column (8) and capable of horizontally rotating to adjust the position, wherein the battery sample is fixed on the workbench (10);
the spindle box (1) is connected with the stepping motor (2), and a drill bit interface is arranged at the lower end of the spindle box (1);
the laser distance measuring device is arranged on the spindle box (1) and used for acquiring vertical distance information and corresponding position information between the spindle box (1) and the workbench (10);
the drill bit external member is detachably connected to the drill bit interface, the top cover of the battery sample is punched under the vertical force driving of the stepping motor (2) and the torsion driving of the spindle box (1), the current cut-off device is triggered in a programmed mode in a physical mode, and the reliability of the current cut-off device is detected under the condition that gas is not generated inside the battery.
2. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 1, wherein the device for rapidly detecting the reliability of the current cut-off device of the lithium battery further comprises a programmable logic controller (3), and the programmable logic controller (3) is electrically connected with the laser distance meter and the stepping motor (2) respectively.
3. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 2, wherein the stepping motor (2) is provided with two independently controlled output ends, wherein the first independent output end is in transmission fit with the lead screw (4), and the second independent output end is in transmission connection with the spindle box (1).
4. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 1, wherein the drill kit comprises a standard drill (7) and a test drill (6), the standard drill (7) realizes the punching of the top cover of the battery sample, and the test drill (6) triggers the current cut-off device in a programmed way by a physical way.
5. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 4, wherein the test drill bit (6) comprises a drill bit body (6-1), a ring-shaped piezoceramic sensor (6-2) and a drill bit insulating protective sleeve (6-3), the ring-shaped piezoceramic sensor (6-2) is arranged at one end close to the head part of the drill bit body (6-1), and the ring-shaped piezoceramic sensor (6-2) is electrically connected with the programmable logic controller (3) through a piezoelectric signal wire (6-4).
6. The device for rapid detection of the reliability of a current cut-off device of a lithium battery as claimed in claim 5, characterized in that the diameter of the standard drill bit (7) is larger than the diameter of the drill bit insulation protection sleeve (6-3).
7. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 1, wherein the workbench (10) comprises a workbench main body, a cylindrical battery compartment (10-1) is arranged on the workbench main body, and the battery sample is fixed in the cylindrical battery compartment (10-1).
8. The device for rapidly detecting the reliability of the current cut-off device of the lithium battery as claimed in claim 1, wherein the worktable body is further provided with a clamping assembly and a positioning hole (10-4), and the clamping assembly is arranged in the cylindrical battery compartment (10-1) to clamp the battery sample.
9. A method for rapidly detecting the reliability of a lithium battery current cut-off device is characterized by comprising the following steps:
s1: putting a battery sample into a cylindrical battery bin (10-1) for fixing;
s2: rotating the adjusting workbench (10) to enable the battery top cover (12) to be aligned to the laser range finder (5), and measuring the distance from the spindle box (1) to the battery top cover (12);
s3: a standard drill bit (7) is installed on a main spindle box (1), and a programmable logic controller (3) automatically calculates the distance from the head of the standard drill bit (7) to a battery top cover (12) according to built-in parameters;
s4: the workbench (10) is rotationally adjusted again, and the laser range finder (5) is used for realizing the axial position alignment of the spindle box (1) and the workbench (10) through the positioning hole (10-4);
s5: the standard drill bit (7) is retracted after drilling through the battery top cover (12), the test drill bit (6) is used for replacing the standard drill bit (7), and the test drill bit (6) can drill to the standard position of the valve plate welding part (18) of the current cutting device in the battery parameters according to a preset drilling program;
s6: recording pressure data F of a piezoceramic sensor (6-2)VThe inherent internal stress σ of the valve platev＝FVTo judge σVWhether or not at sigmaV-min～σV-maxAnd determining the reliability according to the range.
10. The method as claimed in claim 9, wherein the range F of the tension required to break the welded portion is obtained according to the design data of the battery specificationmin～FmaxAnd trip trigger value F of current cut-off deviceair-min～Fair-maxBased on σV-min＝Fmin-Fair-max，σV-max＝Fmax-Fair-minObtaining the required inherent internal stress range of the valve plate as sigmaV-min～σV-max。
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