Method for describing uniformity of batteries
A consistency, battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inability to apply online calculation of battery consistency
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Embodiment 1
[0032] The target lithium-ion battery is CATL's lithium iron phosphate battery. The battery pack assembled by the single battery is a commercial energy storage system composed of 240 single batteries in series, with a total capacity of Q=40Ah. figure 2 The charging data condition is that the battery pack is charged at a constant current of 0.35C and 63A until the voltage of any single battery reaches 3.6V, that is, the charging is stopped. Record the data satisfying the condition of ΔV≥1mV during the charging process of the battery pack. Calculate the charging data of each single battery in the battery pack and process it into a capacity increment curve. The capacity increment curves of No. 1, 10, 24, and 69 single batteries are as follows: figure 2 as shown, figure 2 The abscissa is the charging capacity, and the vertical axis is the capacity increment dQ / dV. Point A in the figure is the characteristic point position of the No. 1 single battery, and the corresponding char...
example 2
[0037] The target lithium-ion battery is Lishen 21700 ternary lithium-ion battery. The battery pack assembled by the single battery is composed of 16 cells connected in series, with a total capacity of Q=4.5Ah. figure 2 The charging data condition is that the battery pack is charged at a constant current of 0.35C and 63A until the voltage of any single battery reaches 4.2V, that is, the charging is stopped. Record the data satisfying the condition of ΔV≥5mV during the charging process of the battery pack. Calculate the charging data of each single battery in the battery pack and process it into a capacity increment curve. The capacity increment curves of No. 1, 5, 12, and 16 single batteries are shown in Figure 3. image 3 The abscissa is the charging capacity, and the vertical axis is the capacity increment dQ / dV. Point E in the figure is the characteristic point position of the No. 1 single battery, and the corresponding charging capacity is 2.41Ah. Point F in the figure is...
Embodiment example 3
[0042] The difference between implementation case 3 and implementation case 1 and implementation case 2 is that, in addition to the technical solutions described in implementation case 1 and implementation case 2, the target lithium-ion battery pack is a battery composed of multiple batteries through multiple parallel strings Pack system, such as 2 parallel 20 strings, 4 parallel 100 strings, 5 parallel 40 strings, this method is also applicable to the battery pack system composed of multiple parallel strings. The data recording condition may be data under the condition of ΔV≧10mV.
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