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1101030303金蟲 (小有名氣)
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[求助]
請較如何根據(jù)電容器的充放電曲線計(jì)算internal resistance (IR) drop
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請問本版超級電容器的各位高人,如何根據(jù)電容器的充放電曲線來計(jì)算internal resistance (IR) drop?本人以前做鋰電的,現(xiàn)在剛剛接觸電容器方面的知識,對這一計(jì)算著實(shí)很迷茫,搞不清,特地來本版請教。 1. 請教如何根據(jù)電容器的充放電曲線計(jì)算internal resistance (IR) drop? 看到有文獻(xiàn)寫到: The internal resistance was determined from the voltage drop at the beginning of each discharge: R=△V(iR為V的下標(biāo))/2i, △V(iR為V的下標(biāo)) is the voltage drop between the first two points from its top cut-off. This voltage drop is also referred to as the iR drop. i is the current applied. 2. 想請較高人簡單解釋或者介紹一下功率和能量密度計(jì)算公式的由來。 看見該文獻(xiàn)談到功率密度和能量密度的計(jì)算公式如下: P=V*V/[4RM] & E=0.5CV*V/M where V is the applied voltage ,R is the internal resistance, M is the total mass of active electrode materials used in electrochemical capactiors, and C is the measrued total capacitance of electrochemical capactiors 這與常見的P和E計(jì)算公式有出入啊 E=It(Ua)/m P=I(Ua)/m 其中,I為充放電電流,t為放電時(shí)間,Ua為平均工作電壓,m為正負(fù)極活性材料的質(zhì)量之和。 [ Last edited by 1101030303 on 2012-1-31 at 22:49 ] |
超級電容器 | 電化學(xué)可能用到的 |
金蟲 (小有名氣)
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多謝指點(diǎn),敢問 對計(jì)算電容量的公式: C = i /-[ΔV/Δt] = i /-(slope) where i is the current applied, [ΔV/Δt] is the slope of the discharge curve after the initial iR drop. 其中的ΔV為第二點(diǎn)的電壓減去放電結(jié)束那個(gè)點(diǎn)的電壓?Δt為放電結(jié)束那個(gè)點(diǎn)的時(shí)間減去第二點(diǎn)的時(shí)間? 對于內(nèi)部電阻計(jì)算公式: R = ΔV(iR) /2i ΔV(iR) is the voltage drop between the first two points from its top cut-off. This voltage drop is also referred to as the iR drop. i is the current applied. 其中的 ΔV(iR)為放電最高點(diǎn)的電壓減去第二點(diǎn)的電壓? |
木蟲 (著名寫手)
人民大會堂首席清潔工

金蟲 (小有名氣)
木蟲 (正式寫手)
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