A multiscale study on the effect of compression on lithium-ion
The compression of the separator was found to adversely influence the charging performance of the Li-ion battery. When the compression ratio reaches 40 %, the charging
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Li-ion Battery Separators, Mechanical Integrity and Failure
We conducted an experimental study of the separators under mechanical loading, and discovered two distinct deformation and failure mechanisms, which could explain the
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Mechanical damage in a lithium-ion pouch cell under indentation
It remains a challenge to fully understand the nature of the mechanical damage process with the aim of improving battery crash safety. The present paper investigates the
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Electrochemical Change Induced by
From a two-dimensional electrochemical simulation of a spherical indentation on a layer-structured battery, it is found that there is local negative value of the side reaction
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Li-ion Battery Separators, Mechanical Integrity and Failure
However, a comprehensive understanding on micro deformations in separator structure and failure mechanisms in more realistic loadings like punch indentation is still missing.
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Thermal runaway of Li-ion batteries caused by hemispherical indentation
Finally, the study found that every 20% change in SOC has a greater impact on the battery response under a squeeze. The larger the SOC, the more severe the battery thermal runaway.
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Mechanical Failure Modes of Prismatic Lithium-ion Battery Separator
This review summarizes and discusses lithium-ion battery separators from a new perspective of safety (chemical compatibility, heat-resistance, mechanical strength and anti-dendrite ability), the
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Dynamic Indentation of Prismatic Li-Ion Battery Cells
2.2 Jellyroll Compression Tests. Jellyrolls extracted from the cells were subjected to the uniaxial compressions in the thickness direction at various strain rates ranging from 9 × 10 –4 /s to 657/s. Compression tests for strain rate tests up to 9/s were conducted in the constant speed mode using an MTS machine (Criterion (R) Series 40) equipped with a 100 kN load cell.
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Degradation of battery separators under charge–discharge cycles
It has been found that the separators that underwent higher cycles failed at lower lateral punch force and smaller deformation. Live cell tests also indicate that the deformation and force intensity at the onset of short circuit decreased for a cell after 1200 cycles compared to those for a non-cycled cell, when under lateral indentation.
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Mechanical Properties of Macromolecular Separators for Lithium
In this study, a nanoindentation experiment is performed to investigate the mechanical properties of two types of separators for LIBs based on the grid nanoindentation
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A mechanism computational model of internal short circuit
However, when considering sphere indentation and flat-headed indentation, some deviations emerge between the simulation results for separators with different thicknesses and the experimental data, with the exception of the favorable agreement observed for the 7.9 μm thick separator (Fig. 10 b-c). This divergence can likely be attributed to the larger contact area
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Degradation of battery separators under
Punch test results for separators with different punch size. (a) Punch diameter: 25.4 mm. (b) Punch diameter: 12.7 mm. (c) Punch diameter: 6.4 mm. (d) Punch diameter: 3.175 mm. (e) Normalized
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Safeguarding lithium-ion battery cell separators
pressure from a localized indentation in the battery surface. At the same time, efforts to develop lithium-ion battery cells that offer improved performance characteristics and that are smaller and lighter in weight have also resulted in major modifications in battery separators and other essential battery materials. For example, the use of a
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The compression behavior, microstructure evolution and
It is evident that these existing studies only considered the effects of relatively small compression of the separator on electrochemical performance (35 MPa in Ref. [18], 25 MPa in Ref. [21], 40
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The Effect of Battery Separator Properties on Thermal Ramp, Overcharge
The significance of the reliability of battery separators has recently attracted attention because of the safety related events such as the Boeing 787 Dreamliner battery incidents and Samsung''s Galaxy Note 7 incidents and subsequent recall. The indentation induced internal short circuit (IIISC) test is used to evaluate the cell''s ability to
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Degradation of battery separators under charge discharge cycles
Experimental work The battery cells in this study had an elliptical shape and a nickel oxide chemistry. The dimensions were 64.8 mm by 37.2 mm by 19.1 mm and their nominal capacity was 5.3 A h.
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Deformation and failure characteristics of four types of lithium
For separators, uniaxial tensile tests using strip and dogbone geometries with strip widths in the range of 1.45 mm to 25 mm, gauge lengths in the range of 8 mm to 50 mm, and strain rates in the
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Experimental parameters of battery module indentation
This strain-rate dependency is significantly relevant when the battery undergoes compressive loads due to the porous nature of the polymeric separator membrane (see Figure 3.73) or the electrode
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How does room temperature cycling ageing affect lithium-ion battery
The indentation process was recorded by a CCD camera with a frequency of 4 fps and the intrusion depth was calculated with digital image correlation (DIC, VIC-2D). The open circuit voltage (OCV) was recorded via a high-speed acquisition card with a resolution of 0.1 mV and a sampling frequency of 15 Hz. Li-ion battery separators, mechanical
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Tuneable and efficient manufacturing of Li-ion battery separators
A variety of alternative separator technologies have been reported in the literature. 3,5,6 Firstly, multiple surface treatment strategies have been developed to increase electrolyte wettability and thermal stability of polyolefin separators, which has also been implemented industrially. 5 Several ceramic coatings (such as aluminum oxide) have been employed, leading to lower thermal
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Mechanical Properties of Macromolecular
High tensile strength and toughness play an important role in improving the mechanical performance of separator films, such as resistance to external force,
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Optimization of Lithium-Ion Battery Pouch Cell for Maximization
Therefore, the separator failure of the pouch cell was evaluated according to the SAE J2464 crush test, which is a standard test proposed by SAE International. 38 The crush test emulates a situation wherein the battery is loaded because a structure, such as an engine, pushes toward the interior of the EV when a crash accident occurs. 8 The test evaluates the
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Nanoindentation testing of separators for lithium-ion batteries
Knowledge of the compressive mechanical properties of battery separator membranes is important for understanding their long term performance in battery cells The method we introduced in 1992 for measuring hardness and elastic modulus by instrumented indentation techniques has widely been adopted and used in the characterization of small
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Mechanical damage in a lithium-ion pouch cell under indentation loads
Although the entire process of separator thinning during the indentation test has not yet been traced, it can be inferred that besides the damage evolution on the concerned interfaces, the local thinning of the separator may be another source of the inflection of the force vs. indentation response at cell level. Li-ion battery separators
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Nanoindentation testing of separators for lithium-ion batteries
Here we investigate the effects of electrolyte solvents on the mechanical properties of a polypropylene battery separator through experimental measurements of
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Investigation of the mechanical behaviour of lithium-ion batteries
Indentation tests were performed separately on different layers of a lithium-ion battery using a Berkovich indenter.
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Detailed Layered Nonlinear Finite Element Analysis for Lithium-Ion
DOI: 10.1149/1945-7111/abaa19 Corpus ID: 225385058; Detailed Layered Nonlinear Finite Element Analysis for Lithium-Ion Battery Cells to Predict Internal Short Circuits Due to Separator Fractures under Hemisphere Indentation
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Detailed Layered Nonlinear Finite Element Analysis for Lithium-Ion
The separator fracture is predicted by considering material nonlinearity due to the strain-rate effect and material anisotropy. In comparison with the quasi-static indentation
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Detailed Layered Nonlinear Finite Element Analysis for Lithium-Ion
In three cases up to a depth of indentation of 5.5 mm, the separator did not fracture. The reaction force decreased after 5.5 mm because the indentation stopped. Figure 7 presents the maximum principal strain of the separator between the NDL and RVE models at the depth of indentation of the onset of the separator fracture measured in the
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Li-ion Battery Separators, Mechanical Integrity and Failure
head is one of the standard abuse tests for lithium-ion battery separators. It is performed with a punch of 3.2 mm in diameter according to ASTM F1306-90, and usually referred to as a puncture
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Dynamic crashing behaviors of prismatic lithium-ion battery cells
Indentation parameters and impact speed on the mechanical responses of LIB cells. [23] experimentally characterized the macroscopic properties of battery separator with a multilayer polymeric thin film at different temperatures, strain rates, and solvent saturations. It was found that temperature and strain rate exhibited a nearly linear
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Schematics of two different methods for measuring the
An 8Ah prismatic lithium ion cell with high current charge and discharge ability has been developed. Due to the safety and cost issues, the power type Li-ion cell was designed by using LiMn 2O 4
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Li-ion Battery Separators, Mechanical Integrity and Failure Mechanisms
Separator integrity is an important factor in preventing internal short circuit in lithium-ion batteries. Local penetration tests (nail or conical punch) often produce presumably sporadic results
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The indentation analysis triggering internal short circuit of
According to the requirements of the United States Advanced Battery Consortium (USABC) for lithium-ion battery separators, the specifications of separators immersed in liquid electrolyte are >300
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(PDF) Criteria and Design Guidance for Lithium-ion
The experimental and simulated curves of (a) battery case, (b) separator, (c) anode and (d) cathode under tensile loading. The experimental and simulated results of (e) anode and (f) cathode under
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Generalized separator failure criteria for internal short circuit of
Besides, the battery sample applied in indentation experiments is with the cathode in the outermost layer (Methodology). In our previous study [29], we conducted the electrode-stack indentation
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Mechanical shutdown of battery separators: Silicon anode failure
Separator degradation during the cycling of the Si full cells a Cycling performance of the full cells with different anodes: NCMA cathode (4.5 mAh cm⁻²)/graphite anode (5.0 mAh cm⁻²) or pure
View more6 FAQs about [Battery separator has indentation]
Why is the mechanical integrity of battery separator important?
The mechanical integrity of battery separator is critical for prevention of internal short circuit. A better understanding of the mechanical behavior and failure mechanisms of the separators may assist in explaining an apparently conflicting response.
Why is separator integrity important in lithium-ion batteries?
Separator integrity is an important factor in preventing internal short circuit in lithium-ion batteries. Local penetration tests (nail or conical punch) often produce presumably sporadic results, where in exactly similar cell and test set-ups one cell goes to thermal runaway while the other shows minimal reactions.
Can a lithium-ion battery separator be abused?
The separator may go under this kind of loading in most real world mechanical abuse scenarios. It represents combined in-plane biaxial tension and out-of-plane compression. A punch test with a small radius punch head is one of the standard abuse tests for lithium-ion battery separators.
How does nanoindentation affect a battery?
Nanoindentation, on the other hand, determines the mechanical properties (elastic modulus and hardness) of separators on length scales comparable to typical sizes of active material particles in battery electrodes or metal fines that can ingress a battery during manufacturing.
How do micropores affect a lithium-ion battery separator?
The micropores of the separator have a significant influence on the obstruction of the electrode active material particles at the initial stage and on the micro particles that may enter the lithium-ion battery during the manufacturing process, which may cause damage to the weak point of the separator.
How strong is a lithium ion battery separator?
According to the requirements of the United States Advanced Battery Consortium (USABC) for lithium-ion battery separators, the specifications of separators immersed in liquid electrolyte are >300 g/25.4 μm puncture strength and <2% offset at 1000 psi tensile strength.
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