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相关概念视频

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Multiple Voltage Sources

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Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel.
In series, the positive terminal of one battery is connected to the negative terminal of another battery. Hence, the voltage of each battery is added to give the net voltage, which is increased because each battery boosts the electrons that enter it. The same current flows through each battery because they are connected in series.
Batteries are...
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Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Kirchoff's Rules: Application01:22

Kirchoff's Rules: Application

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Kirchhoff's rules quantify the current flowing through a circuit and the voltage variations around the loop in a circuit. Applying Kirchhoff's rules generates a set of linear equations that allow us to find the unknown values in circuits. These may be currents, voltages, or resistances.
When applying Kirchhoff's first rule, the junction rule, label the current in each branch and decide its direction. If the chosen direction is wrong, it will have the correct magnitude, although the...
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Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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在高速电池应用过程中绘制内部温度

T M M Heenan1,2, I Mombrini1,3, A Llewellyn1

  • 1Electrochemical Innovation Laboratory, Department of Chemical Engineering, University College of London, London, UK.

Nature
|May 17, 2023
PubMed
概括

高速电动汽车电池使用会导致内部温度升高. 新的X射线衍射方法非破坏性地绘制了离子电池温度,揭示了充电协议影响的热积累.

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Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
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科学领域:

  • 材料科学
  • 电化学
  • 热管理

背景情况:

  • 电动汽车需要高的充/放电速度,导致离子电池的内部温度升高.
  • 密封的离子电池使内部温度的测量变得困难.
  • 通过X射线衍射 (XRD) 的电流收集器扩展提供了非破坏性的内部温度监测.

研究的目的:

  • 在高速运行期间 (超过3C) 描述18650离子电池的内部温度,应变和电荷状态.
  • 使用先进的同步XRD方法进行操作温度映射和单点测量.

主要方法:

  • 操作同步X射线衍射 (XRD) 用于细胞截面的温度映射.
  • 在充放电周期中进行单点XRD测量.
  • 具有不同能量和功率优化的18650离子电池的特征.

主要成果:

  • 在20分钟内放电一个能量优化的电池 (3.5Ah) 导致内部温度>70°C.
  • 一个功率优化的电池 (1.5Ah) 的更快的12分钟放电产生了<50°C的温度.
  • 在相同的电流下 (例如6A放电),两种电池类型都显示了相似的峰值温度 (~40°C).
  • 操作温度升高与热积累有关,由充电协议 (CC/CV) 和细胞降解加剧.

结论:

  • 这项研究展示了一种新的,非破坏性的方法,用于在高速运行时测量离子电池的内部温度.
  • 充电协议显著影响热量积累,影响电池性能和寿命.
  • 这种方法可以指导电动汽车改进的热管理策略的开发.