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首页> 外文期刊>Journal of power sources >Investigating electrical contact resistance losses in lithium-ion battery assemblies for hybrid and electric vehicles
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Investigating electrical contact resistance losses in lithium-ion battery assemblies for hybrid and electric vehicles

机译：调查混合动力和电动汽车的锂离子电池组件中的电接触电阻损耗

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摘要

Lithium-ion (Li-ion) batteries are favored in hybrid-electric vehicles and electric vehicles for their outstanding power characteristics. In this paper the energy loss due to electrical contact resistance (ECR) at the interface of electrodes and current-collector bars in Li-ion battery assemblies is investigated for the first time. ECR is a direct result of contact surface imperfections, i.e., roughness and out-of-flatness, and acts as an ohmic resistance at the electrode-collector joints. A custom-designed testbed is developed to conduct a systematic experimental study. ECR is measured at separable bolted electrode connections of a sample Li-ion battery, and a straightforward analysis to evaluate the relevant energy loss is presented. Through the experiments, it is observed that ECR is an important issue in energy management of Li-ion batteries. Effects of surface imperfection, contact pressure, joint type, collector bar material, and interfa-cial materials on ECR are highlighted. The obtained data show that in the considered Li-ion battery, the energy loss due to ECR can be as high as 20% of the total energy flow in and out of the battery under normal operating conditions. However, ECR loss can be reduced to 6% when proper joint pressure and/or surface treatment are used. A poor connection at the electrode-collector interface can lead to a significant battery energy loss as heat generated at the interface. Consequently, a heat flow can be initiated from the electrodes towards the internal battery structure, which results in a considerable temperature increase and onset of thermal runaway. At sever conditions, heat generation due to ECR might cause serious safety issues, sparks, and even melting of the electrodes.
机译：锂离子（Li-ion）电池因其出色的功率特性而在混合动力汽车和电动汽车中受到青睐。本文首次研究了由于锂离子电池组件中的电极与集流条之间的界面处的电接触电阻（ECR）而造成的能量损失。 ECR是接触表面缺陷（即粗糙度和不平整度）的直接结果，并在电极-集电极接头处充当欧姆电阻。开发了定制设计的试验台，以进行系统的实验研究。在样品锂离子电池的可分离螺栓电极连接处测量ECR，并提出了一种简单的分析方法来评估相关的能量损耗。通过实验可知，ECR是锂离子电池能量管理中的重要问题。着重指出了表面缺陷，接触压力，接头类型，集电棒材料和界面材料对ECR的影响。获得的数据表明，在考虑的锂离子电池中，在正常工作条件下，由于ECR引起的能量损失可能高达流入和流出电池的总能量的20％。但是，如果使用适当的接缝压力和/或表面处理，则ECR损失可降低到6％。电极-集电极接口处的连接不良会导致大量的电池能量损失，因为接口处会产生热量。因此，可以从电极向内部电池结构引发热流，这导致相当大的温度升高和热失控的开始。在严酷的条件下，由于ECR产生的热量可能会导致严重的安全问题，火花甚至电极熔化。

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