A calculation method for calibrating packsoc based on the capacity of a single battery
A single battery and calculation method technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of inconsistent battery temperature, inconsistent SOC value, difficult PACKSOC estimation, etc., to improve accuracy and reliable battery life. , the effect of reducing complexity
Active Publication Date: 2021-12-10
ZHEJIANG LEAPMOTOR TECH CO LTD
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Problems solved by technology
[0004] The present invention mainly solves the original technical problems; it provides a calculation method for calibrating PACKSOC based on the capacity of a single battery, which effectively solves the inconsistency of the SOC value, the inconsistency of the SOH value and the inconsistency of the battery temperature between the battery cells connected in series in the battery pack The resulting PACKSOC is difficult to estimate, and can more accurately estimate the remaining discharge capacity and remaining charge capacity in the battery pack, reducing the complexity of the battery pack PACKSOC estimation, and also providing a reliable basis for the endurance of the power battery
Method used
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Embodiment
[0048] Embodiment: A kind of calculating method based on single battery capacity calibration PACKSOC of this embodiment, such as figure 1 shown, including the following steps:
[0049]S1 assembles n single cells in series to form a PACK system, where n≥2;
[0050] S2 calculates the actual chargeable discharge capacity of each battery cell in series, the specific process is as follows figure 2 shown, including:
[0051] S21 In the static state, obtain the SOC (battery state of charge) value of each battery cell connected in series in the battery pack before charging, denoted as SOC 1 、SOC 2 、SOC 3 ,...,SOC n ;
[0052] S22 charges the battery pack and obtains the charging capacity q:
[0053]
[0054] Where i represents the charging current, t represents the charging time;
[0055] S23 Obtain the SOC value of each battery cell connected in series in the battery pack after charging, denoted as SOC t1 、SOC t2 、SOC t3 ,...,SOC tn ;
[0056] S24 calculates the SOC ...
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The invention discloses a calculation method for calibrating PACKSOC based on the capacity of a single battery, comprising the following steps: assembling at least two single batteries in series to form a battery pack system; obtaining the actual chargeable and discharging capacity of each battery cell in the battery pack Capacity; calculate the remaining discharge capacity of all battery cells at time k; compare the remaining discharge capacity to find the battery cell with the smallest remaining discharge capacity; compare the remaining charging capacity to find the battery cell with the smallest remaining charging capacity; through the weight formula, Linearization calculates the state of charge of the battery pack. The present invention realizes the smooth transition between the state of charge of the battery pack between the state of charge of the battery cell with the smallest remaining discharge capacity and the state of charge of the cell of the single battery with the smallest remaining charge capacity through weight design, and realizes the state of charge of the battery pack to Accurate characterization of the capacity of the entire battery pack reduces the complexity of estimating the state of charge of the battery pack, and also provides a reliable basis for the endurance of the power battery.
Description
technical field [0001] The present invention relates to the technical field of battery remaining power estimation, in particular to a calculation method for calibrating PACKSOC based on the capacity of a single battery. Background technique [0002] Accurate power battery SOC estimation is the most basic performance index of lithium batteries and one of the most important indicators to ensure battery life. Especially in the field of pure electric vehicles, which are currently widely used, high-precision SOC estimation can ensure the safe use of batteries, prolong the service life of batteries, and can also solve the driver's anxiety about battery mileage. [0003] However, in the actual multi-series battery pack system, there are often inconsistencies between each single battery. This problem is mostly due to the inconsistency of the capacity of the battery and the inconsistency of the remaining battery power, which leads to the inconsistency of the battery voltage. , and s...
Claims
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IPC IPC(8): G01R31/382G01R31/367
CPCG01R31/382G01R31/367
Inventor 高科杰
Owner ZHEJIANG LEAPMOTOR TECH CO LTD