Single battery sorting method for producing lithium ion battery pack
A technology for lithium-ion battery packs and single cells, applied in sorting and other directions, can solve the problems of not considering the battery pack's charging and discharging current, working voltage range, unable to reflect battery dynamic characteristics, short screening time, etc., to ensure consistency , the effect of preventing overcharging, improving cycle performance and safety
Pending Publication Date: 2022-03-29
天津仁爱学院 +1
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Problems solved by technology
This method has short screening time and high efficiency, but it can only ensure the consistency of these static characteristic parameters of the selected single battery, but cannot reflect the dynamic characteristics of the battery during operation.
On the other hand, the battery capacity data based on the existing sorting process is often obtained under specific charging and discharging conditions, without considering the actual charging and discharging current and the actual working voltage range of the battery pack, and the single battery capacity data obtained by sorting and matching groups After the bulk batteries are combined into a battery pack, it is likely to show new inconsistencies under actual working conditions
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Embodiment
[0059] The object of the present embodiment is to divide the three-dimensional lithium ion cells of 12 18650 type 2.6ah by the method of the present invention, which is used to produce a combined structure of 3S2P lithium ion battery pack. The lithium ion battery pack nominal voltage is 10.8 V, a nominal capacity of 5.2ah, a charging current 2a, a working discharge current 3a, and an operating voltage range 9V-12.6V. According to the actual operating parameters of the battery pack, charging current I can calculate the charging current I to perform capacity testing of the battery to be sorted by the present invention. 1 2A / 2 = 1A, I 2 The discharge current is 3A / 2 = 1.5a, the discharge cutout voltage V 3 Take 9V / 3 = 3V.
[0060] The sorting steps are as follows:
[0061] Step 1: Treating a single cell with 1A to perform constant current charging, charge the charging cutoff voltage 4.2V;
[0062] Step 2: After the shelving 60 minutes, measuring the battery voltage to obtain th...
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The invention discloses a single battery sorting method for producing a lithium ion battery pack. The single battery sorting method comprises the following steps: measuring a constant-current charging static voltage V2 of a battery to be sorted; measuring the discharge capacity C2 of the battery under a certain discharge current; after shelving, measuring the voltage of the battery to obtain a discharge termination rebound voltage V4; after the battery is charged according to a certain mechanism, the battery is put aside for 2-28 days under the condition of a certain temperature T; measuring the voltage V5 and the internal resistance R of the shelved battery; and sorting the to-be-sorted batteries according to the battery discharge capacity C2, the constant-current charging static voltage V2, the discharge termination rebound voltage V4, the post-shelving voltage V5 and the internal resistance R. According to the method, the actual charging and discharging working conditions of the battery pack are considered, charging and discharging testing is conducted on the battery through the actual working current, the battery capacity under the actual working conditions is obtained, the dynamic characteristics of the battery are reflected through the polarization voltage of the battery under the actual working conditions, the sorting precision is high, and the effect is good.
Description
Technical field [0001] The present invention belongs to the technical field of battery, and more particularly to a monomer battery sorting method for producing a lithium ion battery pack. Background technique [0002] Lithium-ion batteries have advantages over energy, long cycle life, safety and environmental protection, have been widely used in electric vehicles, power tools, energy storage systems and other fields. However, the lithium-ion cell battery voltage is only about 3.2-3.7V, and the monomer capacity is also limited, so the monomer battery cannot meet the battery energy and power requirements for electrical load. To improve the battery voltage and capacity, it is necessary to combine the monomer battery into a battery pack through parallel and in series to satisfy the battery energy and power of the electricity load. The lithium-ion battery pack is combined by a large number of monomer batteries, which means that the battery pack performance is affected by the "wooden b...
Claims
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Login to View More IPC IPC(8): B07C5/344
CPCB07C5/344
Inventor 郅晓科纪继坤李凤民
Owner 天津仁爱学院