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Cable cross section calculation formula of lithium-ion battery pack

by:Vglory      2020-08-22
Lithium battery and dc ark should be in accordance with the cable connection cable choice between long-term allows carrying capacity and selection circuit allows the two conditions of the voltage drop. According to the long-term load flow calculation of electric current, should be allowed for 1 h discharging rate of current lithium batteries; Voltage drop should be allowed according to the lithium battery pack outlet minimum voltage selection calculation, should not be less than 1% of the nominal voltage dc system, calculation of its current should be 1 h discharging rate of current lithium-ion batteries or accident early discharge ( 1分钟) Impact of discharge current both concurrently. Its computation formula is as follows: according to the cable long-term allows carrying capacity: A Ipc Ica1 or according to the circuit allows voltage drop: type: Ipc - cable allows the carrying capacity, A; The Ica - current calculation, A; Ica1 - long-term work current loop, AIca2 - short-term work current, AScac - cable cross section calculation, was rho - resistivity, copper conductor rho = 0. 0184Ω。 Was/m, aluminum conductor rho = 0. 031Ω。 mm2/m; - cable length L, m Δ Up - loop allows the voltage drop, V. Lithium-ion battery pack loop cable, therefore, is the key to calculating the accident early discharge ( 1分钟) Impact of discharge current and 1 h discharging rate of current lithium batteries. Practical application of a 2 x 300 mw coal-fired power plants, each unit installed three groups of lithium battery, two groups of 110 v lithium battery to control the load power supply. Presently known dc load per unit as follows, such as the plant chooses 1600 ah 220 v lithium-ion battery pack, lithium battery export and dc power distribution ark connection cable length of 25 meters, strives for the cross section of the cable should be which of the following values ( Table 1. ) 。 If a 220 v lithium-ion battery pack accident early discharge ( 1分钟) Impact of discharge current need to calculate the 220 v lithium-ion battery pack accident early discharge ( 1分钟) Power load. All load types are analyzed for 220 v power load statistics: 120 x is 0. 6+3×1+( 8 + 20) ×0. 8+22×2×0. 9 +20×0. 6 = 149 kw, so the accident early discharge ( 1分钟) The impact of discharge current. As 149/220 = 677. 28A。 Source: the lithium battery forklift truck; Please keep the source! Reproduced in the form of links, please indicate the address: newshow. asp吗? nid=713& lid=83
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