CN107390137B - Insulation puncture needle for evaluating safety performance of lithium ion battery - Google Patents
Insulation puncture needle for evaluating safety performance of lithium ion battery Download PDFInfo
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- CN107390137B CN107390137B CN201710700170.4A CN201710700170A CN107390137B CN 107390137 B CN107390137 B CN 107390137B CN 201710700170 A CN201710700170 A CN 201710700170A CN 107390137 B CN107390137 B CN 107390137B
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000009413 insulation Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 35
- 230000035515 penetration Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000001467 acupuncture Methods 0.000 claims 2
- 238000003860 storage Methods 0.000 abstract description 12
- 238000010998 test method Methods 0.000 abstract description 7
- 229930040373 Paraformaldehyde Natural products 0.000 description 25
- -1 polyoxymethylene Polymers 0.000 description 25
- 229920006324 polyoxymethylene Polymers 0.000 description 25
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 20
- 229910052721 tungsten Inorganic materials 0.000 description 20
- 239000010937 tungsten Substances 0.000 description 20
- 238000002474 experimental method Methods 0.000 description 14
- 210000004027 cell Anatomy 0.000 description 13
- 238000004080 punching Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 210000001787 dendrite Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000001931 thermography Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000009950 felting Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses an insulation puncture needle for evaluating the safety performance of a lithium ion battery. When the existing needling test national standard GB/T31485-2015 'safety of power storage batteries for electric automobiles and test method' is used for needling test of a steel needle battery, two problems exist: resulting in extremely rapid discharge behavior of the battery and a large heat loss through the steel pins. Based on the two points, the invention adopts the insulating puncture needle made of the high-temperature resistant material with high resistivity, low heat conductivity coefficient, high strength and high hardness to replace the steel needle in GB/T31485-2015 for the needling test, and the insulating puncture needle has the characteristics that: the high strength and high hardness characteristics ensure that the puncture needle has the ability to puncture the battery; the high temperature resistance ensures the integrity of the appearance of the puncture needle when the puncture needle is in short circuit and temperature rise in the battery; the high resistivity characteristic ensures that the discharge behavior of the battery after the puncture is closer to the real situation; the low thermal conductivity characteristics prevent a significant amount of heat from escaping through the lancet.
Description
Technical Field
The invention relates to the technical field of safety performance evaluation of lithium ion batteries, in particular to an insulation puncture needle for evaluating the safety performance of a lithium ion battery.
Background
The lithium ion battery is used as a new energy battery with the advantages of high specific energy, high battery voltage, wide working temperature range, long storage life and the like, and the application of the lithium ion battery relates to the fields of portable equipment, new energy automobiles, energy storage, military and the like. However, since the lithium ion battery material system contains a large amount of active substances and organic inflammables, safety accidents are extremely easy to occur under various abusive conditions. For example, 80 electric bus fires in holiday villages in Beijing crab island occur in 5 months in 2017, resulting in near-billion losses. And the explosion event of the three star Note 7 mobile phone battery, which occurs in 2016, has a wide negative influence in the whole social level. Therefore, it is important to evaluate the safety performance of the lithium ion battery.
Research has shown that the risk of internal short-circuiting is greatest and thermal runaway is most likely to occur in batteries compared to battery abuse conditions such as external short-circuiting, overcharging, overheating, etc. The induction mode of the internal short circuit comprises the production of burrs, incomplete insulation inside the battery, introduction of metal impurities, extrusion or puncture of a diaphragm by lithium dendrites and external force, and the like. At present, many researches are carried out on experimental simulation means of internal short circuit of lithium ion batteries at home and abroad, including needling and extrusion experiments, implantation of metal impurities and internal short circuit trigger devices based on phase change materials. The method has advantages and disadvantages, but the method for evaluating the safety performance of the lithium ion battery which is widely accepted and standardized and simulates the internal short circuit at present only has a needling test. When the battery is subjected to needling test according to the current national needling test standard GB/T31485-2015 safety and test method of a power storage battery for an electric automobile, the problems that the current path is large, the heat conduction quantity of the steel needle is too large and the like after the battery is pierced are caused due to the fact that the steel needle is used for the test, and the safety performance of the lithium ion battery cannot be accurately evaluated by the traditional needling test method. The novel insulating puncture needle adopted by the invention can well solve the problems.
Disclosure of Invention
In order to solve the problems of rapid battery discharge and steel needle heat conduction caused by a stainless steel needle in the traditional lithium ion battery needling test, the invention provides a novel insulating needling needle made of a high-temperature-resistant material with high resistivity, low heat conduction coefficient, high material strength and high hardness, which is used for substituting the steel needle in the traditional needling test national standard GB/T31485-2015 safety and test method of a power storage battery for an electric automobile for needling test.
The technical scheme adopted by the invention is as follows:
an insulating felting needle for evaluating the safety performance of a lithium ion battery, which is used for replacing a steel needle (including a single cell and a battery module) used in the battery needling test in the current standard, wherein the manufacturing raw material of the novel insulating felting needle is a high-temperature-resistant material with high resistivity, low heat conductivity coefficient, high material strength and high hardness, and comprises the following components: all the materials accord with high resistivity>10 9 Omega-m, electrical insulation), low thermal conductivity coefficient<0.5W m -1 K -1 ) High-temperature resistance (melting point) with high material strength and high hardness (meeting the piercing strength requirement of hard shell and soft package battery)>175 ℃ C.) materials can be used as candidate materials for manufacturing the puncture needles for the test, and materials with higher strength and hardness are selected as much as possible when the resistivity, the heat conductivity and the melting point of the materials meet the requirements of puncture strength of hard shell batteries and soft package batteries.
Further, the puncture needle should be a pointed cylinder, and the total length can be adjusted on the basis of 110mm (e.g., the length can be increased appropriately for testing the battery module) while ensuring smooth and clean surface, thereby eliminating the influence of impurities or other pollutants.
Further, when the puncture needle is used for the needling test, other parameters of the test can be properly adjusted on the basis of the specification in GB/T31485-2015, for example, the reference value of the diameter of the puncture needle is 5-8 mm (single cell) and 6-10 mm (battery module), and the diameter can be properly increased according to the strength requirement of the used materials in practice; the sharp angle of the needle head ranges from 45 degrees to 60 degrees; the needling speed is 25+/-5 mm/s; the penetrating direction is perpendicular to the battery polar plate; the penetration location is located at the geometric center of the penetrated face.
The principle of the invention is as follows:
the novel insulating puncture needle made of the high-temperature-resistant material with high resistivity, low heat conductivity coefficient, high material strength and high hardness is provided for replacing the steel needle in GB/T31485-2015 to perform the lithium ion battery puncture test. All the materials accord with high resistivity>10 9 Omega-m, electrical insulation), low thermal conductivity coefficient<0.5W m -1 K -1 ) High material strength and high hardness(meeting the penetration strength requirement of hard shell and soft package battery) and the like>175 deg.c) material may be used as the candidate material for making the test lancet, and when the resistivity, heat conductivity and melting point of the material are both required, the material should be selected to have higher strength and hardness so as to meet the puncture strength requirements of both hard shell and soft pack batteries. The manufactured puncture needle for testing is required to ensure smooth and clean surface, and other parameters (diameter of the puncture needle, angle of the needle tip, puncture speed, puncture direction, puncture position and the like) of the needling test can be properly adjusted on the basis of the specifications in GB/T31485-2015.
The current national standard of battery needling test in China mainly comes from GB/T31485-2015 'safety and test method of Power storage batteries for electric automobiles', and the given test method of the battery cells and the battery packs is as follows:
1. the single cell needling test steps are as follows:
a) The monomer storage battery is charged according to the method shown in the 6.1.3 model;
b) A high temperature resistant steel needle with the diameter of phi 5 mm-phi 8mm (the needle tip angle is 45-60 degrees, the surface of the needle is smooth and clean, no rust, no oxide layer or no greasy dirt) penetrates from the direction vertical to the polar plate of the storage battery at the speed of (25+/-5) mm/s, the penetrating position is preferably close to the geometric center of the penetrated surface, and the steel needle stays in the storage battery;
c) The reaction was observed for 1h.
2. The battery pack needling test steps:
a) The storage battery module is charged according to the method shown in the 6.1.4 model;
b) A high temperature resistant steel needle with the diameter of phi 6 mm-phi 10mm (the needle tip angle is 45-60 degrees, the surface of the needle is smooth and clean, no rust, no oxide layer and no greasy dirt) penetrates at least 3 single storage batteries in sequence from the direction perpendicular to the storage battery polar plate at the speed of (25+/-5) mm/s, and the steel needle stays in the storage batteries;
c) The reaction was observed for 1h.
It can be seen that current standards require the use of stainless steel needles for needling tests, whether for single cell or battery packs. While needle punching with steel needles presents two problems. Firstly, a large current path is formed after the steel needle pierces the battery, so that the battery can discharge at a very high speed, and the short circuit area in the battery caused by conditions such as external force extrusion, processing burrs, lithium dendrite growth and the like is smaller, and the discharge speed of the battery is also greatly slowed down. Secondly, since stainless steel pins are good conductors of heat, a significant portion of the heat is dissipated through the steel pins during the needling test. The effectiveness of the method for evaluating the safety performance of the lithium ion battery by using the needling test can be directly influenced by the two points. Aiming at the problems, the invention adopts a novel insulating puncture needle made of high-temperature resistant materials with high resistivity, low heat conductivity coefficient, high material strength and high hardness to replace a steel needle in GB/T31485-2015 for the needling test. The novel insulating puncture needle is an electrical insulator, and positive and negative electrode materials after puncturing the battery can form micro-area short circuit under the drive of friction force, so that the test condition is closer to the real internal short circuit condition. In addition, the novel insulating puncture needle is a poor conductor of heat, so that the problem of heat conduction of the traditional steel needle is well solved.
The invention has the beneficial effects that:
the invention solves two problems existing in the traditional needling test. The improved discharging mode of the internal short circuit of the battery triggered by the needling test is more similar to the discharging behavior of the internal short circuit of the battery caused by factors such as external force extrusion, processing burrs, lithium dendrite growth and the like. In addition, the improved needling test method also well avoids the problem of heat conduction of the steel needle in the traditional needling test, so that the temperature of the battery can be raised in a more realistic internal short circuit environment. In a word, the adoption of the novel insulation puncture needle has positive significance for improving the effectiveness of the experimental method for evaluating the safety performance of the lithium ion battery by using a needling test.
Drawings
Fig. 1 is an overall form factor illustration of the present invention. Fig. 1 (a) shows the needle size for needling the single cell, and fig. 1 (b) shows the needle specification for needling the battery module.
From left to right in FIG. 2, there are respectively a polyoxymethylene needle with a diameter of 5mm, a polyoxymethylene needle with a diameter of 8mm, a tungsten steel needle with a diameter of 5mm, and a tungsten steel needle with a diameter of 8 mm.
FIGS. 3 (a) and (b) are voltage-time curves for tungsten steel needling experiments of diameters 5mm and 8mm, respectively.
FIGS. 4 (a) and (b) are two types of voltage-time curves for a 5mm diameter polyoxymethylene needling experiment, respectively, and FIGS. 4 (c) and (d) are two types of voltage-time curves for an 8mm diameter polyoxymethylene needling experiment, respectively.
Fig. 5 is a graph comparing temperature rise curves of tungsten steel needling with temperature curves of two voltage modes in polyoxymethylene needling. Fig. 5 (a) is a schematic diagram showing a comparison of temperature rise curves of two diameters of tungsten steel needle punching and a temperature curve corresponding to a voltage change in a mode a in polyoxymethylene needle punching, and fig. 5 (B) is a graph showing a comparison of temperature rise curves of two diameters of tungsten steel needle punching and a temperature curve corresponding to a voltage change in a mode B in polyoxymethylene needle punching.
FIG. 6 is a thermal image of a polyoxymethylene needle penetration test of 5mm diameter.
FIG. 7 is a thermal imaging of a 5mm diameter tungsten steel needle punch experiment.
FIG. 8 is a thermal image of a polyoxymethylene needle penetration experiment of 8mm diameter.
FIG. 9 is a thermal image of a tungsten steel needle penetration experiment with a diameter of 8 mm.
The specific embodiment is as follows:
the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
In the examples described below, a lithium ion battery needling test was performed using polyoxymethylene as the material of manufacture for the novel insulating lancet, as a control, while a conventional steel needling test was also performed. All tests were performed in a dedicated needling tester.
Examples:
the comparison of the needling test effects of lithium ion batteries respectively using polyoxymethylene and tungsten steel as the needling materials is studied, and fig. 2 is a physical diagram of a polyoxymethylene needle with a diameter of 5mm, a polyoxymethylene needle with a diameter of 8mm, a tungsten steel needle with a diameter of 5mm and a tungsten steel needle with a diameter of 8mm from left to right. Some commercial pouch cell (capacity: 1Ah, electrode material: lithium cobaltate/graphite) with 100% SOC was investigated, and all tests were only performed on single lithium ion cells. The experimental schedule is shown in table 1.
Table 1 comparison of the needling test results for different lancet materials against the table of experimental conditions.
In the experimental process, the open-circuit voltage of the battery is recorded in real time by using a battery charge-discharge circulator, the surface temperature data of the battery close to the needling position is collected in real time by using a thermocouple, and the whole-course temperature change is recorded by using a thermal imager.
Comparative analysis of needling test effect of lithium ion battery with polyoxymethylene and tungsten steel as the needle materials respectively:
FIGS. 3 (a) and (b) are voltage-time curves of tungsten steel needling experiments of diameters 5mm and 8mm, respectively; FIGS. 4 (a) and (b) are two types of voltage-time curves for a 5mm diameter polyoxymethylene needling experiment, respectively, and FIGS. 4 (c) and (d) are two types of voltage-time curves for an 8mm diameter polyoxymethylene needling experiment, respectively. As can be seen from fig. 3 and 4, the battery voltage after the steel needle pierces the battery has only a trend of change, i.e. the needle is suddenly dropped to hundreds of millivolts instantaneously and then slowly dropped to a lower level, and there may be some fluctuation in the middle, no matter the diameter is 5mm or 8 mm; in contrast, there are two modes of variation in cell voltage after the polyoxymethylene needle pierces the cell, whether 5 or 8mm in diameter (designated as modes a and B, respectively). The open-circuit voltage of the battery corresponding to the mode A suddenly drops to more than one thousand millivolts at the needling moment, and then rises back to about 3700 millivolts; whereas the voltage change in mode B is closer to the effect after the steel needle is pierced. When the lithium ion battery is subjected to internal short circuit caused by conditions such as external force extrusion, processing burrs, lithium dendrite growth and the like, the short circuit area is smaller, and the discharging speed of the battery is also very slow, so that the effect of the polyoxymethylene needle penetrating through the battery is closer to a real internal short circuit scene.
In fig. 5 (a), comparing the temperature rise curves of two diameters of tungsten steel needle punching with the temperature curves corresponding to the voltage change according to the mode a in the polyoxymethylene needle punching, it can be seen that the temperature rise of the battery caused by the tungsten steel needle is faster than the temperature rise under the mode a of the polyoxymethylene needle, and the highest temperature which can be reached by the battery after the steel needle is pierced is higher, which is the experiment that a larger current path is formed after the steel needle pierces the battery, so that the battery discharges at a faster speed; in fig. 5 (B), the temperature rise curves of the two diameters of tungsten steel needling and the temperature curve corresponding to the voltage change according to the mode B in the polyoxymethylene needling are compared, and it can be found that the temperature rise rate of the battery caused by the polyoxymethylene needles with the same diameter is obviously faster than that of the tungsten steel needling, which indicates that the heat conduction effect of the steel needles is obvious, and a great part of heat is conducted away through the steel needles during the needling test, thereby affecting the accuracy of the test result.
FIGS. 6 and 7 are thermal imaging diagrams of polyoxymethylene needle and tungsten steel needle penetration experiments, respectively, of 5mm diameter. As can be seen by comparison, a hot spot of about 0.128s is formed in the case of the polyoxymethylene needle, and heat is transmitted to the entire cell by about 0.665s, with a transmission time of about 0.537s; while a hot spot of about 0.325s in the case of tungsten steel pins, to about 0.444s or so of heat is propagated throughout the cell, with a propagation time of only 0.119s. This again confirms the conclusion that the steel needle above would discharge the battery at a faster rate after piercing the battery.
Figures 8 and 9 are thermal imaging diagrams of polyoxymethylene needles and tungsten steel needle punching experiments, respectively, of diameter 8 mm. The hot spot in fig. 8 begins to form at about 0.252s, and the heat propagates throughout the battery for about 0.505s, with a propagation time of about 0.253s; whereas in fig. 9 it takes approximately 0.8s from the beginning of hot spot formation to heat propagation to the whole cell. This is because the heat conduction effect is enhanced after the diameter of the steel needle is increased.
The invention, in part, is not disclosed in detail and is well known in the art.
The foregoing description is only one embodiment of the present invention, and is not intended to limit the scope of the invention, and all equivalent changes made in the description of the invention and the accompanying drawings are included in the scope of the invention as long as they are within the spirit of the invention or directly or indirectly applied to other related technical fields.
Claims (1)
1. The utility model provides an aassessment lithium ion battery security performance's insulating pjncture needle, is used for replacing the steel needle that battery acupuncture test used in the current standard, and battery acupuncture test includes the test of monomer electric core and battery module, its characterized in that: the manufacturing raw material of the insulation puncture needle is a high-temperature-resistant material with high resistivity, low heat conductivity coefficient, high material strength and high hardness, and comprises the following components: all that is required is to meet the high resistivity:>10 9 omega.m, electrical insulation; low thermal conductivity:<0.5 W m -1 K -1 the method comprises the steps of carrying out a first treatment on the surface of the High material strength and high hardness: the penetration strength requirements of the hard shell and the soft package battery are met; high temperature resistance: melting point>175. C°; materials meeting the above conditions can all be used as candidate materials for manufacturing lancets for testing;
when the resistivity, the heat conductivity coefficient and the melting point of the material meet the requirements, the material with higher strength and hardness is selected as much as possible so as to meet the puncture strength requirements of the hard shell and the soft-package battery at the same time;
the puncture needle is a cylinder with a pointed end, the total length can be adjusted according to the test condition on the basis of 110mm, and meanwhile, the surface is ensured to be smooth and clean, so that the influence of impurities or other pollutants is eliminated;
when the puncture needle is used for the needling test, other parameters of the test can be properly adjusted on the basis of the specification in GB/T31485-2015, aiming at the single battery cell: the benchmark of the diameter of the puncture needle is 5-8 mm, and the puncture needle aims at a battery module: the diameter of the puncture needle is 6-10 mm, and the diameter can be properly increased according to the strength requirement of the used materials in practice; the sharp angle of the needle head ranges from 45 degrees to 60 degrees; the needling speed is 25+/-5 mm/s; the penetrating direction is perpendicular to the battery polar plate; the penetration location is located at the geometric center of the penetrated face.
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| CN201710700170.4A CN107390137B (en) | 2017-08-16 | 2017-08-16 | Insulation puncture needle for evaluating safety performance of lithium ion battery |
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| CN110274815B (en) * | 2019-05-06 | 2020-10-09 | 中国汽车技术研究中心有限公司 | Analysis method for mechanical strength of internal structure of lithium ion battery |
| CN111208439B (en) * | 2020-01-19 | 2021-10-22 | 中国科学技术大学 | Quantitative detection method for micro short circuit fault of series lithium ion battery pack |
| CN114171752B (en) * | 2022-02-09 | 2022-05-10 | 江苏净视源能源环保研究院有限公司 | Puncture discharge device for sodium battery recovery and puncture needle thereof |
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